JP5403589B2 - Seat belt retractor - Google Patents

Description

  The present invention relates to an improvement in a seat belt retractor that can prevent an end lock due to a malfunction of a lock member itself.

Conventionally, as a seat belt retractor for safely holding an occupant or the like of a vehicle in a seat, an emergency lock mechanism that physically locks a webbing drawer by a vehicle body acceleration sensing means that reacts to sudden acceleration, collision or deceleration is provided. Therefore, an emergency lock type retractor that effectively and safely restrains an occupant is used.
Also, as a seat belt retractor for fixing child seats to vehicle seats with seat belts, it operates when all the webbing is pulled out, prevents webbing from being pulled out during winding, and deactivates when all the webbing is wound A device equipped with an automatic locking mechanism is used.

  By the way, in the seatbelt retractor provided with the emergency lock mechanism, the rotation of the spindle (winding shaft) in the webbing pull-out direction may be locked even when it is not necessary in the event of a vehicle emergency. That is, when the entire amount of webbing is suddenly taken up in accordance with the spring force of the take-up spring from the webbing pulled-out state when the vehicle is mounted, the emergency lock mechanism is activated by the impact and the rotation of the spindle in the webbing pull-out direction is locked. In this case, the webbing cannot be pulled out. In addition, since the webbing is fully wound up at this time, the spindle cannot rotate in the webbing winding direction, and the retractor falls into a so-called end-locked state.

  For example, there are the following emergency locking mechanisms. One is to detect the sudden withdrawal of the webbing and prevent the spindle from rotating in the webbing withdrawal direction (webbing acceleration sensing means: WS), and the other is to sense the sudden deceleration of the vehicle and to pull the spindle webbing. This is one that prevents rotation in the direction (vehicle body acceleration sensing means: VSI). In either case, the lock member that rotates integrally with the spindle is rocked so that the claw of the lock member meshes with the inner teeth of the frame that supports the spindle to lock the spindle (for example, Patent Document 1). And 2).

There are the following three cases where such an end lock occurs.
(1) Due to malfunction of webbing acceleration sensing means (WS).
In general, the webbing acceleration sensor means that when the belt is pulled out rapidly, the rotation of the mass side is delayed from the spindle due to the inertia of the mass, so that the lock member pops out and bites into the inner teeth of the frame Is used. However, if the webbing is stretched after the webbing is taken up suddenly, the mass is moved relative to the spindle with momentum, and the lock member is engaged with the inner teeth of the frame.
(2) Due to malfunction of vehicle body acceleration sensing means (VSI).
This is a case where when the acceleration is inputted to the vehicle body acceleration sensing means due to the rapid winding of the webbing, the ball as the inertia member moves, the lever swings, and the lever is rocked to be engaged with the latch member.
(3) Due to malfunction of the lock member itself.
This is a case where the lock member itself bites into the internal teeth of the frame with the momentum of winding the webbing.

  The seat belt retractor described in Patent Document 1 guides a cam follower provided on a rocking prevention member in a cam groove of a cam plate that is interlocked with the rotation of a spindle, and rotates a stopper portion of the rocking prevention member. And this stopper part contact | abuts to an inertial body, hold | maintains an inertial body in a non-operation position, and prevents a rocking | fluctuation of an inertial body. As a result, when the webbing winding is completed, the inertial body operates to prevent engagement with the lock gear (ratchet wheel), and end-locking when the webbing winding is completed is prevented.

  Further, the seat belt retractor described in Patent Document 2 has a cam member that is rotated by a planetary gear mechanism, and the lock wheel provided with a pair of lock plates as a lock means is fully wound with the spindle. End lock prevention means for preventing relative rotation is provided. Further, the seat belt retractor constitutes an automatic lock mechanism by rotating another cam member via a gear of the planetary gear mechanism and another gear.

JP-A-9-58410 Japanese Patent Laid-Open No. 10-129417

  By the way, in the seatbelt retractor described in Patent Document 1, the end lock due to the malfunction of the webbing acceleration sensing means is prevented by preventing the swinging of the inertial body, but the end lock of the lock member is described. Not. Further, in the retractor for seat belt described in Patent Document 2, it is described that an end locking due to a malfunction of the lock member itself is provided while an automatic lock mechanism is provided. In addition, there is no description of an end lock due to a malfunction of the webbing acceleration sensing means.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to generate end lock due to malfunction of the lock member itself together with the operation of at least one of the webbing acceleration sensing means and the automatic lock mechanism of the emergency lock mechanism. It is an object of the present invention to provide a compact seatbelt retractor that can prevent the above.

In order to achieve the above-mentioned object, a seatbelt retractor according to the present invention is characterized by the following (1) to (11).
(1) a spindle that is rotatably supported by a frame and on which a webbing is wound;
A locking member that locks rotation of the spindle in the webbing pull-out direction by engaging with the frame;
A steering wheel that is rotatably supported by the spindle and that operates the lock member by causing a rotation delay with respect to the spindle;
A control plate that rotates at a different speed from the spindle according to the rotation of the spindle;
A mechanism that is pivotally supported by the steering wheel and that displaces between an operating position where rotation of the steering wheel in the webbing pull-out direction is prevented and a non-operation position where rotation of the steering wheel in the webbing pull-out direction is not blocked. Stopping means,
With
The locking means is controlled by the control plate so that one of the operating position and the non-operating position is held under a predetermined webbing condition.
The lock member is controlled by the control plate so as to be held at a lock release position where the lock cannot be engaged with the frame when the winding of the webbing is completed .
The lock member is provided with a pin portion that penetrates a cam hole formed in the steering wheel,
A cancel member having a lock member protrusion extending in the axial direction toward the control plate is provided so as to be movable together with the pin portion,
When the webbing is completely wound, the control plate abuts against the lock member protrusion to restrict the cancel member, and controls the lock member to be held in the unlocked position. A retractor for a seat belt, comprising:
(2) The seat belt retractor according to (1) , wherein the cancel member is a cancel cap that is positioned and fixed to the pin portion penetrating the cam hole and moves with the movement of the pin portion.
(3) The cancel member further includes a long hole into which the pin portion penetrating the cam hole is inserted, and is swingably supported by the steering wheel so as to swing by the movement of the pin portion. The retractor for a seat belt according to (1) , wherein the retractor is a cancel lever.
(4) a spindle that is rotatably supported by a frame and on which a webbing is wound;
A locking member that locks rotation of the spindle in the webbing pull-out direction by engaging with the frame;
A steering wheel that is rotatably supported by the spindle and that operates the lock member by causing a rotation delay with respect to the spindle;
A control plate that rotates at a different speed from the spindle according to the rotation of the spindle;
A mechanism that is pivotally supported by the steering wheel and that displaces between an operating position where rotation of the steering wheel in the webbing pull-out direction is prevented and a non-operation position where rotation of the steering wheel in the webbing pull-out direction is not blocked. Stopping means,
With
The locking means is controlled by the control plate so that one of the operating position and the non-operating position is held under a predetermined webbing condition.
The lock member is controlled by the control plate so as to be held at a lock release position where the lock cannot be engaged with the frame when the winding of the webbing is completed.
The locking means is a WS lever that constitutes a webbing acceleration sensing means that, when the webbing is pulled out at a predetermined speed or more, is displaced to a first operating position and prevents rotation of the steering wheel in the webbing pull-out direction. And
The WS lever is controlled by the control plate so as to be held at a first non-operating position in which rotation of the steering wheel in the webbing pull-out direction is not prevented when the webbing winding is completed. Cie Toberuto retractor.
(5) The webbing acceleration sensing means has one end supported by the steering wheel and the other end supported by the WS lever, and biases the WS lever toward the first inoperative position. A force means,
The WS lever includes a claw portion engageable with an internal tooth formed on an inner peripheral surface of a cover member attached to the frame, a WS protrusion portion extending in an axial direction toward the control plate, Have
The control plate has a WS cam that controls the WS lever to be held in the first inoperative position by contacting the WS protrusion when the webbing winding is completed. The seatbelt retractor according to (4) .
(6) The WS lever further includes a protrusion for preventing the lock member from protruding in the axial direction toward the spindle,
Between the spindle and the steering wheel, the steering wheel is biased against the spindle so that the lock member is held in the unlocked position and the spindle and the steering wheel rotate together. Means are provided,
A cam groove is formed on the side surface of the spindle to accommodate the protrusion for preventing the lock member from popping out,
The cam groove prevents the lock member from popping out from the lock release position when the WS lever is held in the first inoperative position when the webbing is completely wound. Has a pop-out prevention part engaged with the part,
The WS lever is held in the first non-operating position when the webbing winding is completed, thereby preventing a delay in the rotation of the steering wheel with respect to the spindle and holding the lock member in the unlocked position. The retractor for seat belts as described in (5) characterized by the above-mentioned.
(7) The locking means is displaced to the second operating position from when the webbing is pulled out by the first predetermined amount until it is wound up by the second predetermined amount, so that the webbing pull-out direction of the steering wheel Further comprising an ALR lever that constitutes an automatic locking mechanism that prevents rotation of
The automatic locking mechanism further includes ALR biasing means having one end supported by the steering wheel and the other end supported by the ALR lever.
The ALR lever has an ALR projection extending in the axial direction toward the control plate, and an abutting arm that can abut against the WS lever,
The control plate includes a WS cam that controls the WS lever so that the WS lever is held in the first inoperative position by contacting the WS protrusion when the webbing is completely wound. An ALR cam that abuts the ALR protrusion when the predetermined amount of 1 is pulled out and snaps the ALR lever to the second operating position beyond the dead point of the ALR biasing means; Have
When the ALR lever snaps to the second operating position, the abutting arm portion abuts on the WS lever, and the claw portion of the WS lever is engaged with the internal teeth of the cover member, While preventing rotation of the steering wheel in the webbing pull-out direction,
When the webbing is pulled out for the second predetermined amount after the webbing is pulled out, the WS cam comes into contact with the WS protrusion and the WS lever is moved to the first inoperative position. In this case, when the WS lever contacts and is pressed against the abutting arm, the ALR lever is separated from the WS lever. The seatbelt retractor according to (6) , wherein the seat belt retractor snaps to a non-operating position beyond the dead point of the ALR biasing means.
(8) a spindle that is rotatably supported by the frame and on which the webbing is wound;
A locking member that locks rotation of the spindle in the webbing pull-out direction by engaging with the frame;
A steering wheel that is rotatably supported by the spindle and that operates the lock member by causing a rotation delay with respect to the spindle;
A control plate that rotates at a different speed from the spindle according to the rotation of the spindle;
A mechanism that is pivotally supported by the steering wheel and that displaces between an operating position where rotation of the steering wheel in the webbing pull-out direction is prevented and a non-operation position where rotation of the steering wheel in the webbing pull-out direction is not blocked. Stopping means,
With
The locking means is controlled by the control plate so that one of the operating position and the non-operating position is held under a predetermined webbing condition.
The lock member is controlled by the control plate so as to be held at a lock release position where the lock cannot be engaged with the frame when the winding of the webbing is completed.
The locking means is displaced to the second operating position from when the webbing is pulled out by the first predetermined amount until it is wound up by the second predetermined amount, thereby rotating the steering wheel in the webbing pulling direction. It is an ALR lever that constitutes an automatic locking mechanism to block,
The ALR lever is controlled by the control plate so as to be held in the second operating position from when the webbing is pulled out by a first predetermined amount until it is wound up by a second predetermined amount. A retractor for a seat belt.
(9) The automatic lock mechanism further includes ALR biasing means having one end supported by the steering wheel and the other end supported by the ALR lever.
The ALR lever has an ALR projection extending in the axial direction toward the control plate,
The control plate abuts against the ALR projection when the webbing is pulled out by a first predetermined amount, and moves the ALR lever past the dead point of the ALR biasing means to the second operating position. When the webbing is wound up by a second predetermined amount, the snapping operation is performed, and the ALR lever is brought into contact with the ALR lever beyond the dead point of the ALR biasing means in the direction of pulling the webbing of the steering wheel. The retractor for a seat belt according to (8) , further comprising an ALR cam that snaps to a second non-operating position where rotation is not prevented.
(10) A drive gear that rotates integrally with the spindle, a driven gear that rotates integrally with the control plate and has fewer teeth than the drive gear, and an idle gear that meshes with both the drive and the driven gear. A gear speed increasing mechanism;
The seat belt retractor according to any one of (1) to (9) , wherein the control plate rotates at a speed higher than the rotation of the spindle by the gear speed increasing mechanism.

  According to the seat belt retractor of the present invention, at least one of the operation of the automatic locking mechanism, the operation of preventing the end lock due to the malfunction of the webbing acceleration sensing means, and the occurrence of end lock due to the malfunction of the lock member itself are prevented. Since the operation | movement to perform can be performed by the single control plate, the retractor which has these functions can be reduced in size.

It is a disassembled perspective view of the seatbelt retractor of one Embodiment of this invention. It is sectional drawing of the assembly state of the retractor for seatbelts of FIG. It is a front view of a steering wheel. (A) is a perspective view of a bearing cover, (b) is a front view of a bearing cover. (A) is the cam side perspective view of a control plate, (b) is the front view. It is a figure for demonstrating the control state by each cam of a control plate, (a) shows a total amount storing state, (b) shows a webbing mounting state, (c) shows the state just before pulling out all the amounts. It is a figure for demonstrating switching of an automatic locking mechanism, (a) shows the state just before pulling out all the webbing, (b) shows the state which an automatic locking mechanism act | operates by pulling out all, (c) Shows a state in which the webbing is wound and the second ALR cam is in contact with the cam pin of the ALR lever. (D) shows that the webbing is further wound and the second ALR cam pushes the cam pin. The state which rotates an ALR lever is shown, (e) shows the state by which the action | operation of the automatic lock mechanism was cancelled | released. It is a figure for demonstrating operation | movement of WS lever of a webbing acceleration sensing means, (a) is a state when the phase difference between the inertial body 70 and the steering wheel 40 is 0 degree, (b) is this phase difference (C) shows a state when the phase difference is 5 °. It is a figure for demonstrating the action | operation of a lock dock, (a) is a state at the time of WS lever engagement, (b) is a tooth dock engagement start state of a lock dock, (c) is complete of a lock dock. Indicates the binding state. It is a disassembled perspective view of the seatbelt retractor of 2nd Embodiment of this invention. It is a front view of the steering wheel of FIG. (A) is the cam side perspective view of the control plate of FIG. 10, (b) is the front view. It is a figure of the total amount storage state which permeate | transmits and shows each component controlled by each cam of a control plate. It is a figure of the webbing mounting | wearing state which permeate | transmits and shows each component controlled by each cam of a control plate. In order to explain the canceller function of the seatbelt retractor, it is a view through which each component controlled by each cam of the control plate is shown, (a) shows a state in which the WS lever is operated, (b) Shows a state in which the WS lever is locked to the inner teeth of the bearing cover, and (c) shows a state in which the lock dock is engaged. It is a figure for demonstrating switching of an automatic locking mechanism, (a) shows the state just before pulling out all the webbing, (b) shows the state which an automatic locking mechanism act | operates by pulling out all, (c) Is a state where the webbing is wound up by a predetermined amount and the automatic locking mechanism is activated, (d) is a state where the webbing is wound while the automatic locking mechanism is activated, and (e) is a state where the webbing is further FIG. 4 shows a state in which the operation release operation of the automatic lock mechanism is started after being wound, and FIG. 5F shows a state in which the operation of the automatic lock mechanism is released. It is a figure for demonstrating operation | movement of WS lever of a webbing acceleration sensing means, (a) is an initial state without the phase shift between the inertial body 70 and the steering wheel 40, (b) produces this phase shift, A state in which the WS lever is close to the inner teeth of the bearing cover, (c) shows a state in which the phase shift further occurs and the WS lever is engaged. It is a figure for demonstrating the action | operation of a lock dock, (a) is a state at the time of WS lever engagement, (b) is a tooth dock engagement start state of a lock dock, (c) is complete of a lock dock. Indicates the binding state.

  Hereinafter, a preferred embodiment of the seatbelt retractor of the present invention will be described in detail with reference to FIGS.

  The seatbelt retractor of this embodiment has both an emergency locking mechanism having a webbing acceleration sensing means and a vehicle body acceleration sensing means, and an automatic locking mechanism. As shown in FIGS. 1 and 2, this seat belt retractor is made of a metal (for example, aluminum alloy) spindle 1 around which a webbing (not shown) is wound, and the spindle 1 is rotated in the winding direction. A spring-type winding device 2 that urges, a metal U-shaped frame 10 that rotatably supports the spindle 1, a metal (for example, iron) lock dock 20 as a lock member, and a resin A steering wheel 40, a metal (for example, zinc alloy) inertial body (inert mass) 70 that imparts mass to the steering wheel 40, and a resin ratchet wheel 30 as a latch member attached to the inertia mass 70; Resin WS lever 50 of webbing acceleration sensing means as locking means, and resin ALR lever of automatic locking mechanism as locking means. -60, a resin cancel cap 90 which is a cancel member attached to the lock dock 20, a resin control plate 80, a vehicle body acceleration sensing means 110 for sensing the acceleration of the vehicle body, the lock dock 20, and the ratchet wheel 30 And a resin bearing cover 100 as a cover member that covers main components of the emergency lock mechanism such as the steering wheel 40, the WS lever 50, the inertial body 70, and the vehicle body acceleration sensing means 110. The inertia mass 70 may be made of resin.

  As shown in FIG. 2, the frame 10 has left and right side plates 10A and 10B that are opposed to each other with a central portion of the spindle 1 in the axial direction, and an emergency lock mechanism and an automatic lock mechanism are disposed outside one side plate 10A. The winding device 2 is disposed outside the other side plate 10B. The shaft 5 on one end side of the spindle 1 passes through the center holes 45, 75, 85 of the steering wheel 40, inertia mass 70, and control plate 80, and the drive gear 6 is fitted to the tip of the shaft 5 so as to rotate integrally. ing.

  An idle gear 7 is pivotally supported on the bearing cover 100 attached to one side plate 10 </ b> A of the frame 10, and meshes with both the drive gear 6 and a driven gear 81 formed on one side of the control plate 80. ing. Accordingly, the rotation of the spindle 1 is transmitted from the drive gear 6 to the driven gear 81 via the idle gear 7, and the control plate 80 having the driven gear 81 rotates at an increased speed in conjunction with the spindle 1. . The speed increasing ratio of the gear speed increasing mechanism comprising the drive gear 6, the idle gear 7, and the driven gear 81 is such that the rotation of the spindle 1 when the webbing is fully pulled out to the fully wound state is controlled by the control plate 80. It is set to a numerical value that can be converted into one rotation. In the present embodiment, the number of teeth of the drive gear 6 is 22, the number of teeth of the idle gear 7 is 13, and the number of teeth of the driven gear 81 is 21. The drive, idle, and driven gears 6, 7, and 81 are made of resin.

  A large number of internal teeth 11 into which the claws 22 of the lock dock 20 are fitted are formed on the inner periphery of the circular opening of the side plate 10 </ b> A of the frame 10. The lock dock 20 is slidably accommodated in a space secured between one end face of the spindle 1 and a metal (for example, iron) cover plate 29 fixed to the end face. In addition, a spring accommodation hole 3 that supports and accommodates one end of the coil spring 28 is formed on one end face of the spindle 1. Then, by supporting the other end of the coil spring 28 on a spring support (not shown) formed on the back surface of the steering wheel 40, the coil spring 28 rotates the steering wheel 40 counterclockwise with respect to the spindle 1 (unlock direction). ) To allow the spindle 1 and the steering wheel 40 to rotate integrally. The lock dock 20 is held in the unlocking direction in which the claw 22 is separated from the internal teeth 11 by inserting the cam pin 21 into the cam hole 41 formed in the steering wheel 40. Further, when necessary, the steering wheel 40 is rotated relative to the spindle 1 in the clockwise direction (actually, the spindle 1 is rotated), and the movement of the cam pin 21 resists the force of the coil spring 28. Then, the nail 22 jumps out. Then, the claw 22 jumping out is engaged with the inner teeth 11 of the frame 10 to lock the spindle 1 to the inner teeth 11 of the frame 10 and mechanically lock the rotation in the webbing pull-out direction.

  The steering wheel 40 is supported by the spindle 1 so as to be relatively rotatable. As shown in FIG. 3, the steering wheel 40 is fitted into the cam hole 41 with which the cam pin 21 of the lock dock 20 is engaged and the shaft hole 51 of the WS lever 50. A convex shaft 42 that swingably supports the lever 50, a convex shaft 43 that swingably supports the ALR lever 60 by fitting in the shaft hole 61 of the ALR lever 60, and a convex that protrudes toward the spindle side of the ALR lever 60. And another cam hole 44 that accommodates the portion 64.

The cam hole 41 pushes the claw 22 of the lock dock 20 outward through the cam pin 21 when the steering wheel 40 rotates relative to the spindle 1. For example, when the steering wheel 40 is delayed in rotation with respect to the spindle 1 when the webbing is pulled out, the lock dock 20 is operated to the lock side by the relative rotation of the spindle 1 and the steering wheel 40.
A cancel cap 90 having a lock member projection 91 extending in the axial direction toward the control plate 80 on the side surface of the cam pin 21 penetrating the cam hole 41 is not rotatable relative to the cam pin 21. Positioning is fixed.

The WS lever 50 includes a claw 52 that can be engaged with an inner tooth 108 (FIG. 4) of the bearing cover 100 described later and a WS protrusion 53 that extends in the axial direction toward the control plate 80. The WS lever 50 is rotationally biased in a direction in which the claw 52 is retracted inward by a WS spring 58 that is a biasing means for WS, and is held in a first inoperative position that does not engage with the internal teeth 108 in a normal state. The The WS spring 58 is supported at one end by the steering wheel 40 and at the other end by the WS lever 50.

The ALR lever 60 includes a cam pin 62 that is an ALR protrusion extending in the axial direction toward the control plate 80, a claw 63 that can be engaged with the internal teeth 108 (FIG. 4) of the bearing cover 100, And a convex portion 64. The ALR lever 60 supports the other end portion of an ALR spring 69 which is an ALR biasing means whose one end portion is supported by the steering wheel 40. The ALR lever 60 is guided by the ALR spring 69 in the second cam position where the convex portion 64 is guided in the other cam hole 44 of the steering wheel 40 and is not engaged with the internal tooth 108. Snap action is performed across the dead point of the ALR spring 69 between the two inoperative positions.

  The inertia body 70 is attached to the steering wheel 40 with the WS lever 50, the ALR lever 60, and the like assembled to the steering wheel 40, and the center hole 75 is fitted to the shaft 5 of the spindle 1 so as to be relatively rotatable. Yes. Further, the inertia body 70 is assembled so as to be slightly rotatable relative to the steering wheel 40 by a plurality of claw members 46 provided around the center hole 45 of the steering wheel 40. A convex portion 71 is provided on a side surface of the inertial body 70, and the convex portion 71 is located in the vicinity of the base portion of the WS protrusion portion 53 of the WS lever 50. When relative rotation occurs between the inertial body 70 and the steering wheel 40, the convex portion 71 of the inertial body 70 presses the WS lever 50 supported by the steering wheel 40, and the claw of the WS lever 50 52 is displaced to the first operating position protruding outward and meshed with the internal teeth 108 of the bearing cover 100. As a result, the webbing sensing means prevents the steering wheel 40 from rotating in the webbing pull-out direction. The inertia body 70 includes notches 72 and 73 through which the protrusion 53 of the WS lever 50 and the lock member protrusion 91 of the cancel cap 90 penetrate toward the control plate 80, and the cam pin 62 of the ALR lever 60. A through-hole 74 is formed through which can be swung freely toward the control plate 80 side.

  As shown also in FIG. 4, a cylindrical wall 107 protrudes from the inner surface side of the face plate 101 of the bearing cover 100, and the above-described WS lever 50 and ALR lever 60 can be engaged with the inner periphery of the cylindrical wall 107. Teeth 108 are provided. Further, the bearing cover 100 is provided with a base portion 110A constituting the vehicle body acceleration sensing means 110, and a ball cover 127 for holding a ball (not shown) is attached thereto. Then, when a ball (not shown) moves in accordance with the vehicle body acceleration, the VS sensor lever 120 as the operating member swings and the claw 121 is lifted, and engages with the external teeth 31 provided on the outer periphery of the ratchet wheel 30. Then, the ratchet wheel 30 is locked.

  The control plate 80 is provided with a center hole 85 that is rotatably fitted to the bearing cover 100 at the center, and the above-described driven gear 81 is provided on one side. Further, on the side opposite to the side where the driven gear 81 is provided, as shown in FIG. 5, a first cam 86 that is a WS cam, a second cam 87 that constitutes an ALR cam, 88, a fourth cam 89 which is a cam for the lock member protrudes in the axial direction and is formed in a rib shape.

  The first cam 86 is formed in a circular arc shape concentric with the outer peripheral surface of the control plate 80, and when the webbing winding is completed, the first cam 86 contacts the projection 53 of the WS lever 50 in the first non-operating position. It is formed so as to include a contact position. The second cam 87 extends substantially in the radial direction of the control plate 80 and is formed in an arc shape. When the webbing is pulled out from just before the full amount is pulled out to the full amount that is the first predetermined amount, the cam pin 62 of the ALR lever 60 is drawn. It is formed in the position which contacts. The third cam 88 has a circular arc portion concentric with the outer peripheral surface of the control plate 80 and a guide portion extending toward the inner periphery from one end of the circular arc portion, and the total amount of webbing being the first predetermined amount. When the second predetermined amount is wound from the drawer, it is formed at a position where it comes into contact with the cam pin 62 of the ALR lever 60 in the second operating position. The fourth cam 89 is formed in an arc shape concentric with the outer peripheral surface of the control plate 80, and is attached to the lock dock 20 at the unlocking position where it does not engage with the internal teeth 11 of the frame 10 when the webbing winding is completed. The lock member projection 91 of the cancel cap 90 is formed so as to include a position where it comes into contact with the inner peripheral surface.

Next, the operation of the seat belt retractor of the present embodiment will be described.
As shown in FIG. 6A, in the state in which the entire amount of webbing is stored, the protrusion 53 of the WS lever 50 is in contact with the outer peripheral surface of the first cam 86, and the WS lever 50 is pulled out of the webbing of the steering wheel 40. The first non-actuated position where rotation in the direction is not prevented, that is, the position where the claw 52 that does not engage with the internal teeth 108 of the bearing cover 100 is retracted is held unrotatable.

  Similarly, the protrusion 91 of the cancel cap 90 is in contact with the inner peripheral surface of the fourth cam 89, and the lock dock 20 cannot be rotated at a position where it cannot engage with the inner teeth 11 of the frame 10. Retained. The outer peripheral surface of the third cam 88 is opposed to the ALR lever 60 in the vicinity thereof, and the ALR lever 60 that is biased by the ALR spring 69 and is in the second non-operating position is snapped by the second operation. Prevents movement to the operating position.

  When the webbing is pulled out from the full storage state shown in FIG. 6A, the control plate 80 rotates relative to the spindle 1 in the arrow A direction. Therefore, the control plate 80 rotates relative to the lock dock 20 supported by the spindle 1 and the WS lever 50 and ALR lever 60 supported by the steering wheel 40 rotating together with the spindle 1 in the direction of arrow A.

  Accordingly, the contact between the protrusion 53 of the WS lever 50 and the first cam 86 is released, and the contact between the protrusion 91 of the cancel cap 90 and the fourth cam 89 is released. For this reason, the WS lever 50 held in the first non-operating position by the WS spring 58 can swing and rotate to the first operating position that prevents the steering wheel 40 from rotating in the webbing pull-out direction. Further, the lock dock 20 held at a position where it cannot be engaged with the inner teeth 11 of the frame 10 by the coil spring 28 can jump outward to a position where it engages with the inner teeth 11. Therefore, as shown in FIG. 6B, in the webbing wearing state in which the tongue is attached to the buckle, the webbing can be freely pulled out and taken up at normal times when the deceleration exceeding the predetermined value does not act on the vehicle. Further, in a webbing wearing state, the webbing acceleration sensing means and the vehicle body acceleration sensing means can be operated in an emergency in which a deceleration greater than a predetermined value acts on the vehicle.

  Then, as shown in FIGS. 6C and 7A, in the vicinity of the full amount drawer where the webbing is further pulled out, the cam pin 62 of the ALR lever 60 abuts on the second cam 87 and is further pulled out, It moves radially inward along the arc of the second cam 87. For this reason, the ALR lever 60 snaps to the second operating position beyond the dead point of the ALR spring 69. As a result, as shown in FIG. 7B, the claw 63 of the ALR lever 60 engages with the internal teeth 108 of the bearing cover 100, so that the automatic locking mechanism is activated, and the spindle 1 rotates in the pull-out direction. Is regulated.

  In this state, the spindle 1 can rotate while flipping the ALR lever 60 inward by the internal teeth 108 together with the steering wheel 40, so that the webbing can be taken up. For this reason, when the child seat or the like is attached, the child seat can be securely fixed to the vehicle seat by setting the automatic locking mechanism in an activated state and winding the surplus webbing with the winding device 2.

  Then, as shown in FIG. 7 (c), when the webbing is wound up by the second predetermined amount from the vicinity of the entire amount, the cam pin 62 of the ALR lever 60 comes into contact with the third cam 88, and FIG. As shown, it moves radially outward along the other cam hole 44 and snaps to the second non-operating position beyond the dead point of the ALR spring 69 (see FIG. 7E). Thereby, the operation state of the automatic lock mechanism is switched to the state in which the emergency lock mechanism can be operated.

  Further, after the occupant releases the fastening between the tongue and the buckle, the webbing is wound up by the spring force of the winding device 2. The protrusion 53 of the WS lever 50 comes into contact with the first cam 86 from the time before the winding is completed to the time of completion, and the WS lever 50 is held in the first inoperative position, and the protrusion of the cancel cap 90 The portion 91 comes into contact with the fourth cam 89, and the lock dock 20 is held at the unlocked position where it cannot be engaged with the internal teeth 11 of the frame 10. As a result, it is possible to prevent end lock due to malfunction of the webbing acceleration sensing means and to prevent end lock of the lock dock 20 itself.

  6B, when the webbing is pulled out at a predetermined speed or more due to a vehicle collision or the like and a sudden webbing pulling force is applied to the spindle 1, the state shown in FIG. Relative rotation occurs between the inertial body 70 and the steering wheel 40 from the state where the phase difference between the inertial body 70 and the steering wheel 40 is 0 °. For this reason, as shown in FIG. 8B, the convex portion 71 of the inertial body 70 that is in contact with the WS lever 50 presses the WS lever 50 and rotates the WS lever 50. When the predetermined angle is reached, the claw 52 of the WS lever 50 engages with the internal teeth 108 of the bearing cover 100 (see FIG. 8C).

  Then, as shown in FIG. 9A, when the webbing is further pulled out in a state where the steering wheel 40 is fixed by engaging the claw 52 of the WS lever 50 with the internal teeth 108 of the bearing cover 100, the steering wheel 9 causes a rotation delay with respect to the spindle 1, and the lock dock 20 in which the cam pin 21 is accommodated in the cam hole 41 of the steering wheel 40 moves outward as shown in FIG. 22 jumps out and engages with the internal teeth 11 of the frame 10. FIG. 9C shows a state in which the webbing is further pulled out and the claw 22 of the lock dock 20 is completely fastened to the inner teeth 11 of the frame 10. As a result, the spindle 1 is locked and rotation of the webbing in the pulling direction is prevented.

  Further, when the vehicle body acceleration sensing means 110 is activated, the ratchet wheel 30 is locked by the claws 121 of the VS sensor lever 120 engaging the external teeth 31 of the ratchet wheel 30. When the ratchet wheel 30 is locked, relative rotation occurs between the inertial body 70 to which the ratchet wheel 30 is fixed and the steering wheel 40, so that the spindle is acted by the action of the WS lever 50 and the lock dock 20 in the same manner as described above. 1 is locked.

  As described above, according to the seatbelt retractor of the present embodiment, the function of the automatic lock mechanism, the function of preventing end lock due to malfunction of the webbing acceleration sensing means, and the end lock due to malfunction of the lock dock 20 itself. Can be controlled by a single control plate 80, and a retractor having these functions can be miniaturized.

  Specifically, the function of preventing the end lock due to the malfunction of the lock dock 20 itself includes the cam pin 21 of the lock dock 20 penetrating the cam hole 41 of the steering wheel 40 and the protrusion 91 for the lock member. A cancel cap 90 that moves together with the movement, and a control plate that controls the lock cap 20 to be held in the unlocked position by contacting the lock member protrusion 91 when the webbing winding is completed and restricting the cancel cap 90 This can be done with 80 fourth cams 89.

  Further, the function of preventing the end lock due to the malfunction of the webbing acceleration sensing means can be performed by the WS protrusion 53 of the WS lever 50 and the first cam 86 of the control plate 80. The automatic locking mechanism can be operated and released by the ALR spring 69, the cam pin 62 of the ALR lever 60, and the second and third cams 87 and 88 of the control plate 80.

  Further, since the WS lever 50 and the ALR lever 60 are respectively engaged with the internal teeth 108 of the bearing cover 100, the positions where the two levers 50 and 60 are engaged are shared, the number of parts is reduced, and the retractor is mounted. It can be downsized.

  The control plate 80 is rotated at a speed higher than the rotation of the spindle 1 by the gear speed increasing mechanism having the drive gear 6, the driven gear 81, and the idle gear 7, so that the webbing is wound up and pulled out. Further, the swing control of the WS lever 50 and the ALR lever 60 and the movement control of the cancel cap 90 can be easily performed. Specifically, the speed of the control plate 80 is increased so that the control plate 80 rotates by one tooth (for one rotation + one tooth rotation) with respect to one rotation of the spindle 1. A schedule for swinging the lever 50 and the ALR lever 60 and moving the cancel cap 90 can be created.

(Second Embodiment)
Next, a seatbelt retractor according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the same or equivalent part as 1st Embodiment, and description is abbreviate | omitted or simplified.

  As shown in FIG. 10, the seat belt retractor includes a spindle 201 made of a metal (for example, aluminum alloy) around which a webbing (not shown) is wound, a winding device 2 similar to the first embodiment, and Frame 10, a metal (for example, iron) lock dock 220 as a lock member, a resin steering wheel 240, and a metal (for example, zinc alloy) inertial body that imparts mass to steering wheel 240 ( An inertia mass) 270, a resin ratchet wheel 230 as a latch member attached to the inertia mass 270, a resin WS lever 250 as a webbing acceleration sensing means as a locking means, and an automatic locking mechanism as a locking means A cancel member attached to the ALR lever 260 and the lock dock 220 A cancel lever 290 made of resin, a control plate 280 made of resin, a vehicle body acceleration sensing means 110 for sensing the acceleration of the vehicle body, a lock dock 220, a ratchet wheel 230, a steering wheel 240, a WS lever 250, an inertial body 270, As a cover member for covering main components of the emergency lock mechanism such as the vehicle body acceleration sensing means 110, a resin bearing cover 100 having the same configuration as that of the first embodiment shown in FIG. 3 is mainly provided. The inertia mass 270 may be made of resin.

  The shaft 5 on one end side of the spindle 201 passes through the center holes 245, 275, and 285 of the steering wheel 240, inertia mass 270, and control plate 280, and the drive gear 6 is fitted to the tip of the shaft 201 so as to rotate together. ing.

  The configuration of the drive gear 6, the idle gear 7, and the driven gear 81 is the same as that of the first embodiment, and the rotation of the spindle 201 is transmitted from the drive gear 6 to the driven gear 81 via the idle gear 7. A control plate 280 having a driven gear 81 rotates at an increased speed in conjunction with the spindle 201.

  Further, a large number of internal teeth 11 into which the claws 222 of the lock dock 220 are fitted are formed on the inner periphery of the circular opening of the side plate 10 </ b> A of the frame 10. The lock dock 220 is slidably accommodated in a space secured between one end surface of the spindle 201 and a metal (for example, iron) cover plate 229 fixed to the end surface. In addition, a spring accommodation hole 3 that supports and accommodates one end of the coil spring 228 is formed on one end face of the spindle 201. The coil spring 228 supports the other end of the coil spring 228 on a spring support (not shown) formed on the back surface of the steering wheel 240 so that the coil spring 228 rotates the steering wheel 240 counterclockwise with respect to the spindle 201 (unlocked position). ) To allow the spindle 201 and the steering wheel 240 to rotate integrally. The lock dock 220 is held at the unlocked position where the claw 222 is separated from the internal teeth 11 by inserting the cam pin 221 into the cam hole 241 formed in the steering wheel 240. Further, when necessary, the steering wheel 240 is rotated relative to the spindle 201 in the clockwise direction (actually, the spindle 201 is rotated), so that the cam pin 221 moves to resist the force of the coil spring 228. Then the nail 222 jumps out. Then, the claw 222 jumping out is engaged with the inner teeth 11 of the frame 10 to lock the spindle 201 to the inner teeth 11 of the frame 10 (that is, move to the lock position) and rotate in the webbing pull-out direction. Is mechanically locked.

  The steering wheel 240 is supported by the spindle 201 so as to be relatively rotatable. As shown in FIG. 11, the steering wheel 240 is fitted into the cam hole 241 with which the cam pin 221 of the lock dock 220 is engaged and the shaft hole 251 of the WS lever 250 so A convex shaft 242 that supports the lever 250 in a swingable manner, a convex shaft 243 that supports the ALR lever 260 so as to be movable and swingable by fitting in the elongated hole 261 of the ALR lever 260, and a spindle side of the ALR lever 260. Another cam hole 244 that accommodates the protruding convex portion 264, a convex shaft 247 that swingably supports the cancel lever 290 by being fitted in the shaft hole 292 of the cancel lever 290, and a lock member pop-out prevention of the WS lever 250 And a notch 248 that allows the projection 254 to swing.

  The cam hole 241 pushes the claw 222 of the lock dock 220 outward through the cam pin 221 when the steering wheel 240 rotates relative to the spindle 201. For example, when the steering wheel 240 is delayed in rotation with respect to the spindle 201 when the webbing is pulled out, the lock dock 220 is operated to the lock side by the relative rotation of the spindle 201 and the steering wheel 240.

  Further, the tip of the cam pin 221 penetrating the cam hole 241 is inserted into a long hole 293 of a cancel lever 290 that is swingably supported by the convex shaft 247 of the steering wheel 240. The cancel lever 290 has a locking member projection 291 extending in the axial direction toward the control plate 280 at an arm portion different from the arm portion in which the long hole 293 is formed with the shaft hole 292 as the center.

  The WS lever 250 protrudes in the axial direction toward the spindle 201, a claw 252 that can be engaged with the internal teeth 108 of the bearing cover 100, a WS protrusion 253 that extends in the axial direction toward the control plate 280. And a protrusion 254 for preventing the lock member from popping out. The claws 252, the WS protrusions 253, and the lock member protrusion prevention protrusions 254 are provided on the respective arm portions extending from the shaft hole 251 in a direction perpendicular to the axial direction of the shaft hole 251. The WS lever 250 is rotationally biased in a direction in which the claw 252 is retracted inward by a WS spring 258 that is a biasing means for WS, and is held in a first inoperative position that does not engage with the internal teeth 108 in a normal state. The The WS spring 258 is supported at one end by the steering wheel 240 and at the other end by the WS lever 250.

  The ALR lever 260 is a claw arm portion 255 provided with a cam pin 262 that is an ALR projection extending in the axial direction toward the control plate 280, the convex portion 264, and the claw 252 of the WS lever 250. And an abutting arm portion 265 capable of abutting on the arm. The cam pin 262 and the convex portion 264 extend in the axial direction from the same arm portion, and the arm portion and the abutting arm portion 265 extend from the long hole 261 in a direction perpendicular to the axial direction of the long hole 261. Each extends. The ALR lever 260 supports the other end of an ALR spring 269 that is an ALR biasing means having one end supported by the steering wheel 240. The ALR lever 260 is a second type in which the contact arm portion 265 contacts the claw arm portion 255 of the WS lever 250 while the convex portion 264 is guided in the other cam hole 244 of the steering wheel 240 by the ALR spring 269. And the second non-actuated position where it does not contact the claw arm portion 255, the snap action is performed beyond the dead point of the ALR spring 269.

  The inertial body 270 is attached to the steering wheel 240 in a state where the WS lever 250, the ALR lever 260, and the like are assembled to the steering wheel 240, and the center hole 275 is fitted to the shaft 5 of the spindle 201 so as to be relatively rotatable. Yes. In addition, the inertial body 270 is assembled so as to be slightly rotatable relative to the steering wheel 240 by a plurality of claw members 246 provided around the center hole 245 of the steering wheel 240. Protrusions 271a and 271b (see FIG. 13) are provided on the side surfaces of the inertial body 270 so that the protrusions 271a and 271b sandwich the bases in the vicinity of the bases of the WS protrusions 253 of the WS lever 250. Is located. When relative rotation occurs between the inertial body 270 and the steering wheel 240, the convex portion 271a of the inertial body 270 presses the WS lever 250 supported by the steering wheel 240, and the claw of the WS lever 250 252 is displaced to the first operating position protruding outward and meshed with the internal teeth 108 of the bearing cover 100. Thereby, the webbing acceleration sensing means prevents the steering wheel 240 from rotating in the webbing pull-out direction. The inertial body 270 controls a notch 272 that allows the protrusion 253 of the WS lever 250 to penetrate toward the control plate 280, a cam pin 262 of the ALR lever 260, and a lock member protrusion 291 of the cancel lever 290. Through holes 273 and 274 are formed so as to be swingable through the plate 280 side.

  The control plate 280 is provided with a center hole 285 that is rotatably fitted to the bearing cover 100 at the center, and the above-described driven gear 281 is provided on one side. Further, as shown in FIG. 12, a fifth cam 286 and a sixth cam 287 are formed in a rib shape on the side surface opposite to the side where the driven gear 281 is provided, protruding in the axial direction. Note that the fifth cam 286 of the present embodiment is a WS cam that prevents end lock due to malfunction of the WS lever 250 of the webbing acceleration sensing means, and via the WS lever 250 when the automatic lock mechanism is released. It also functions as an ALR cam that snaps the ALR lever 260. The sixth cam 287 is an ALR cam that snaps the ALR lever 260 when the automatic lock mechanism is activated, and also functions as a lock member cam that prevents an end lock due to a malfunction of the lock dock 220 itself. To do.

  The fifth cam 286 is formed in an arc shape concentric with the outer peripheral surface of the control plate 280, and when the webbing winding is completed, the fifth cam 286 contacts the protrusion 253 of the WS lever 250 in the first inoperative position on the outer peripheral surface. A position where the webbing is pulled out by the second predetermined amount when the webbing is pulled out by the first predetermined amount, and a position where the protrusion 253 of the WS lever 250 is in contact with the outer peripheral surface at the first operating position. , So as to include.

  The sixth cam 287 has a first arc portion 287a concentric with the outer peripheral surface of the control plate 280, and a step on one end side of the first arc portion 287a, which is closer to the inner circumference side than the first arc portion 287a. A second arc portion 287b formed concentrically with the outer peripheral surface of the control plate 280, and formed on the other end side of the first arc portion 287a, has a side surface 287d that forms a guide passage 287c and extends in the radial direction. A portion. The side surface 287d of the sixth cam 287 is formed at a position where the webbing comes into contact with the cam pin 262 of the ALR lever 260 when the webbing is pulled out from immediately before the full amount is pulled out to the full amount that is the first predetermined amount. Further, the first arc portion 287a of the sixth cam 287 is formed so that the lock member projection 291 of the cancel lever 290 attached to the lock dock 220 at the unlocking position is in contact with the outer peripheral surface when the webbing winding is completed. It is formed so as to include a contact position. Further, the guide passage 287c holds the cam pin 262 at the time of assembly and restricts the ALR lever 260.

  Further, the locking member pop-out preventing projection 254 of the WS lever 250 is accommodated in a cam groove 208 formed on one end surface of the spindle 201. As shown in FIG. 13, the cam groove 208 has a circumferential direction and a radial direction so as to allow the protrusion 254 to move when the steering wheel 240 and the spindle 201 rotate relative to each other and when the WS lever 250 swings. It is formed in the substantially L shape extended to. The cam groove 208 has a protrusion for preventing the locking member from popping out so that the lock dock 220 does not pop out from the unlocking position when the WS lever 250 is held at the first non-operating position when the winding of the webbing is completed. A wall surface 208a is formed as a pop-out preventing portion that contacts and engages with the portion 254 in the circumferential direction.

Next, the operation of the seat belt retractor of the present embodiment will be described.
As shown in FIG. 13, in the state where all the webbing is stored, the protrusion 253 of the WS lever 250 is in contact with the outer peripheral surface of the fifth cam 286, and the WS lever 250 rotates in the webbing pull-out direction of the steering wheel 240. Is held in a non-rotatable position in the first non-actuated position where the claw 252 that does not engage with the internal teeth 108 of the bearing cover 100 is retracted.

  At this time, the locking member pop-out preventing projection 254 of the WS lever 250 is positioned in contact with the wall surface 208a of the cam groove 208 of the spindle 201, and the rotation delay of the steering wheel 240 relative to the spindle 201 is prevented. For this reason, the lock dock 220 is held at the unlock position where it cannot be engaged with the internal teeth 11 of the frame 10.

  Similarly, the protrusion 291 of the cancel lever 290 is in contact with the outer peripheral surface of the sixth cam 287, and the lock dock 220 cannot be engaged with the internal teeth 11 of the frame 10 by the cancel lever 290. It is held non-rotatable at the unlocked position. The second arc portion 287b of the sixth cam 287 is opposed to the ALR lever 260 in the vicinity thereof, and the ALR lever 260 that is biased by the ALR spring 269 and is in the second inoperative position is snapped by the snap operation. 2 is prevented from moving to the operating position.

  When the webbing is pulled out from the total amount storage state shown in FIG. 13, the control plate 280 rotates relative to the spindle 201 in the arrow A direction. Therefore, the control plate 280 rotates relative to the lock dock 220 supported by the spindle 201, the WS lever 250 supported by the steering wheel 240 that rotates together with the spindle 201, and the ALR lever 260 in the direction of arrow A.

  Accordingly, the contact between the protrusion 253 of the WS lever 250 and the fifth cam 286 is released, and the contact between the protrusion 291 of the cancel lever 290 and the sixth cam 287 is released. Further, the engagement of the locking member pop-out preventing projection 254 of the WS lever 250 with the wall surface 208a is released. For this reason, the WS lever 250 held at the first non-operating position by the WS spring 258 can swing and rotate to the first operating position that prevents the steering wheel 240 from rotating in the webbing pull-out direction. In addition, the lock dock 220 held at a position where it cannot be engaged with the internal teeth 11 of the frame 10 by the coil spring 228, as shown in FIGS. 15 (a) to 15 (c), the first of the WS lever 250. After swinging to the operating position, it is possible to jump out to the lock position that engages with the inner teeth 11.

  Accordingly, as shown in FIG. 14, in the webbing wearing state in which the buckle is attached to the tongue, the webbing can be freely pulled out and taken up at normal times when a deceleration of a predetermined value or more does not act on the vehicle. Further, in a webbing wearing state, the webbing acceleration sensing means and the vehicle body acceleration sensing means can be operated in an emergency in which a deceleration greater than a predetermined value acts on the vehicle.

  Further, as shown in FIG. 16A, in the vicinity of the full amount drawer in which the webbing is further pulled out, the cam pin 262 of the ALR lever 260 abuts on the side surface 287d of the ALR cam 287, and is further pulled out along the side surface 287d. Move radially inward. For this reason, the ALR lever 260 snaps to the second operating position beyond the dead point of the ALR spring 269. As a result, as shown in FIG. 16B, the abutting arm portion 265 of the ALR lever 260 abuts on the claw arm portion 255 of the WS lever 250 to swing the WS lever 250, and the claw of the WS lever 250 252 engages with the internal teeth 108 of the bearing cover 100. Accordingly, as shown in FIG. 16C, the automatic locking mechanism is activated, and the rotation of the spindle 201 in the pulling direction is restricted.

  In this state, as shown in FIG. 16D, the spindle 201 can rotate while flipping the WS lever 250 inward by the internal teeth 108 together with the steering wheel 240, so that the webbing can be taken up. In particular, the abutment arm portion 265 of the ALR lever 260 is in contact with the claw arm portion 255 of the WS lever 250. The ALR lever 260 is supported by the steering wheel 240 so as to be movable by the elongated hole 261. Therefore, when the WS lever 250 is bounced, the WS lever 250 can be moved together with the swing of the WS lever 250, and does not hinder the WS lever 250 from being bounced. For this reason, when the child seat or the like is attached, the child seat can be securely fixed to the vehicle seat by setting the automatic locking mechanism in an activated state and winding the surplus webbing with the winding device 2.

  Then, as shown in FIG. 16 (e), when the webbing is wound up by the second predetermined amount from the vicinity of the entire amount, the protrusion 253 of the WS lever 250 comes into contact with the end portion of the fifth cam 286 and moves in the radial direction. Guided outside. When the webbing is further wound, as shown in FIG. 16 (f), the protrusion 253 of the WS lever 250 comes into contact with the outer peripheral surface of the fifth cam 286, and the WS lever 250 is inactivated for the first time. Hold in position. For this reason, when the WS lever 250 abuts against the abutting arm portion 265 of the ALR lever 260 and is pressed, the ALR lever 260 moves to the second inoperative position where the abutting arm portion 265 is separated from the WS lever 250. The snap action is performed beyond the dead point of the ALR spring 269. Thereby, the operation state of the automatic lock mechanism is switched to the state in which the emergency lock mechanism can be operated.

  Further, after the occupant releases the fastening between the tongue and the buckle from the webbing wearing state, the webbing is wound by the spring force of the winding device 2. The protrusion 253 of the WS lever 250 comes into contact with the fifth cam 286 from before the winding is completed to when it is completed, and the WS lever 250 is held at the first inoperative position. Further, the lock member pop-out preventing projection 254 of the WS lever 250 is engaged with the wall surface 208a of the cam groove 208 of the spindle 201, and the projection 291 of the cancel lever 290 is in contact with the sixth cam 287 to lock the lock. Dock 220 is held in the unlocked position. As a result, it is possible to prevent end lock due to malfunction of the webbing acceleration sensing means and to prevent end lock of the lock dock 220 itself.

  Further, when the webbing is pulled out at a predetermined speed or more due to a vehicle collision or the like in the state where the webbing is shown in FIG. 14 and a sudden webbing pulling force acts on the spindle 201, the inertial body shown in FIG. Relative rotation occurs between the inertial body 270 and the steering wheel 240 from the initial state where there is no phase shift between the 270 and the steering wheel 240. For this reason, as shown in FIG. 17B, the convex portion 271a of the inertial body 270 that is in contact with the WS lever 250 presses the WS lever 250 and rotates the WS lever 250 in the clockwise direction. When the predetermined angle is reached, the claw 252 of the WS lever 250 engages with the internal teeth 108 of the bearing cover 100 (see FIG. 17C). When the engagement is released, the other protrusion 271b of the inertial body 270 that is in contact with the WS lever 250 presses the WS lever 250 and rotates the WS lever 250 counterclockwise.

  Then, as shown in FIG. 18A, when the webbing is further pulled out while the steering wheel 240 is fixed by engaging the claw 252 of the WS lever 250 with the internal teeth 108 of the bearing cover 100, the steering wheel As a result, the lock dock 220 in which the cam pin 221 is accommodated in the cam hole 241 of the steering wheel 240 moves outward as shown in FIG. 222 jumps out and engages with the internal teeth 11 of the frame 10. FIG. 18C shows a state in which the webbing is further pulled out and the claw 222 of the lock dock 220 is completely fastened to the inner teeth 11 of the frame 10. As a result, the spindle 201 is locked and rotation in the webbing pull-out direction is prevented.

  Further, when the vehicle body acceleration sensing means 110 is activated, the ratchet wheel 230 is locked by the claws 121 of the VS sensor lever 120 engaging the external teeth 231 of the ratchet wheel 230. When the ratchet wheel 230 is locked, a relative rotation occurs between the inertial body 270 to which the ratchet wheel 230 is fixed and the steering wheel 240, so that the spindle is caused by the action of the WS lever 250 and the lock dock 220 in the same manner as described above. 201 is locked.

  As described above, according to the seatbelt retractor of the present embodiment, the function of the automatic lock mechanism, the function of preventing end lock due to malfunction of the webbing acceleration sensing means, and the end lock due to malfunction of the lock dock 220 itself. Can be controlled by a single control plate 280, and a retractor having these functions can be miniaturized.

  Specifically, the function of preventing the end lock due to the malfunction of the lock dock 20 itself includes the cam pin 221 of the lock dock 220 that penetrates the cam hole 241 of the steering wheel 240, the long hole 93 into which the cam pin 221 is inserted, and the lock member. A cancel lever 290 having a protrusion 91 and swingably supported by the steering wheel 240 so as to swing when the cam pin 21 moves, and a lock member protrusion 291 when the webbing is completely wound. This is performed by the sixth cam 287 of the control plate 280 which controls the cancel lever 290 and controls the lock dock 220 to be held at the unlock position.

  Further, the function of preventing the end lock due to the malfunction of the webbing acceleration sensing means can be performed by the claw 252 and the WS protrusion 253 of the WS lever 250 and the fifth cam 286 of the control plate 280.

  The automatic locking mechanism includes an ALR lever 260 having an ALR protrusion 262 and an abutting arm 265, and an ALR spring 269, and the WS lever 250 includes a claw 252 and a WS protrusion 253, and a control plate. 80 includes a fifth cam 286 and a sixth cam 287. The ALR spring 269 snaps to the second operating position by the sixth cam 287 when the webbing is pulled out by the first predetermined amount, whereby the abutting arm portion 265 is moved to the WS lever 250. The claw 252 of the WS lever 250 is brought into contact with the inner teeth 108 of the bearing cover 100 to prevent the steering wheel 240 from rotating in the webbing pull-out direction. Further, the fifth cam 286 comes into contact with the WS protrusion 253 when the webbing is pulled out for the second predetermined amount after the first predetermined amount is pulled out, and the WS lever 250 is moved to the first inoperative position. When the WS lever 250 is held and pressed against the abutting arm portion 265, the ALR lever 260 is moved to the second non-operating position where the abutting arm portion 265 is separated from the WS lever 250. Snaps over 269 dead points.

Further, in the present embodiment, the function of preventing the end lock due to the malfunction of the lock dock 220 itself is provided between the lock member pop-out preventing projection 254 of the WS lever 250, and the spindle 201 and the steering wheel 240. A coil spring 228 and a cam groove 208 formed on the side surface of the spindle 201, which movably accommodates a locking member pop-out preventing projection 254 and has a wall surface 208 a that can be engaged with the projection 254. Can also be performed together with the end lock of the WS lever 250.
Other configurations and effects are the same as those of the first embodiment.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  The locking means of the present invention displaces between an operating position where the rotation of the steering wheel in the webbing pull-out direction is blocked and a non-operating position where the rotation of the steering wheel in the webbing pull-out direction is not blocked. It may be at least one of a WS lever and an ALR lever that are controlled so that either the operating position or the non-operating position is maintained under the conditions. That is, when the locking means is a WS lever, it is controlled by the control plate so as to be held in the non-operating position when the webbing winding is completed. When the locking means is an ALR lever, it is controlled by the control plate. The webbing is controlled so as to be held in the operating position from when the webbing is pulled out by the first predetermined amount until it is wound up by the second predetermined amount.

  In addition, the cancel member of the present invention is not limited to the cancel cap or the cancel lever of the present embodiment, and can be moved with the movement of the pin portion of the lock member. Further, the cancel member contacts the control plate when the webbing winding is completed. Thus, any configuration may be used as long as it has a lock member protrusion that can be held at the unlocked position of the lock member via the cancel member.

  The control plate of the present invention may be rotated at a different number of rotations according to the rotation of the spindle, may be a speed-increasing rotation as in the present embodiment, or a rib-shaped cam of the control plate is appropriately designed. By doing so, it may be decelerated.

  Further, the control plate of the present invention controls the swing of the WS lever and the ALR lever and the movement control of the cancel member by the rib. However, these controls are performed by forming a cam groove in the control plate. Also good.

  Furthermore, each cam of the control plate of the present invention can exhibit the function of each cam described above, and can have the shape of this embodiment as long as it does not unnecessarily interfere with the swinging and movement of each protrusion. It is not limited.

1,201 Spindle 2 Spring-type winding device 6 Drive gear 7 Idle gear 10 Frame 20, 220 Lock dock (lock member)
30,230 Ratchet wheel (latch member)
40,240 Steering wheel 50,250 WS lever (locking means)
53,253 WS protrusion 60,260 ALR lever (locking means)
62,262 Cam pin (projection part for ALR)
70,270 Inertial bodies 80,280 Control plates 81,281 Driven gear 86 First cam (WS cam)
87 Second cam (cam for ALR)
88 3rd cam (cam for ALR)
89 Fourth cam (cam for locking member)
90 Cancel cap (cancellation member)
91 Projection part 110 for lock member Car body acceleration sensing means 120 VS sensor lever 208 Cam groove 208a Wall surface (protrusion prevention part)
286 5th cam 287 6th cam 290 Cancel lever (cancellation member)
291 Protrusion for lock member

Claims (10)

A spindle that is rotatably supported by the frame and on which the webbing is wound,
A locking member that locks rotation of the spindle in the webbing pull-out direction by engaging with the frame;
A steering wheel that is rotatably supported by the spindle and that operates the lock member by causing a rotation delay with respect to the spindle;
A control plate that rotates at a different speed from the spindle according to the rotation of the spindle;
A mechanism that is pivotally supported by the steering wheel and that displaces between an operating position where rotation of the steering wheel in the webbing pull-out direction is prevented and a non-operation position where rotation of the steering wheel in the webbing pull-out direction is not blocked. Stopping means,
With
The locking means is controlled by the control plate so that one of the operating position and the non-operating position is held under a predetermined webbing condition.
The lock member is controlled by the control plate so as to be held at a lock release position where the lock cannot be engaged with the frame when the winding of the webbing is completed .
The lock member is provided with a pin portion that penetrates a cam hole formed in the steering wheel,
A cancel member having a lock member protrusion extending in the axial direction toward the control plate is provided so as to be movable together with the pin portion,
When the webbing is completely wound, the control plate abuts against the lock member protrusion to restrict the cancel member, and controls the lock member to be held in the unlocked position. A retractor for a seat belt, comprising: 2. The seat belt retractor according to claim 1 , wherein the cancel member is a cancel cap that is positioned and fixed to the pin portion penetrating the cam hole and moves with the movement of the pin portion. The cancel member is a cancel lever that further includes a long hole into which the pin portion that penetrates the cam hole is inserted, and is swingably supported by the steering wheel so as to swing when the pin portion moves. The seatbelt retractor according to claim 1 , wherein the seatbelt retractor is provided. A spindle that is rotatably supported by the frame and on which the webbing is wound,
A locking member that locks rotation of the spindle in the webbing pull-out direction by engaging with the frame;
A steering wheel that is rotatably supported by the spindle and that operates the lock member by causing a rotation delay with respect to the spindle;
A control plate that rotates at a different speed from the spindle according to the rotation of the spindle;
A mechanism that is pivotally supported by the steering wheel and that displaces between an operating position where rotation of the steering wheel in the webbing pull-out direction is prevented and a non-operation position where rotation of the steering wheel in the webbing pull-out direction is not blocked. Stopping means,
With
The locking means is controlled by the control plate so that one of the operating position and the non-operating position is held under a predetermined webbing condition.
The lock member is controlled by the control plate so as to be held at a lock release position where the lock cannot be engaged with the frame when the winding of the webbing is completed.
The locking means is a WS lever that constitutes a webbing acceleration sensing means that, when the webbing is pulled out at a predetermined speed or more, is displaced to a first operating position and prevents rotation of the steering wheel in the webbing pull-out direction. And
The WS lever is controlled by the control plate so as to be held at a first non-operating position in which rotation of the steering wheel in the webbing pull-out direction is not prevented when the webbing winding is completed. Cie Toberuto retractor. The webbing acceleration sensing means includes a WS biasing means that has one end supported by the steering wheel and the other end supported by the WS lever, and biases the WS lever toward the first inoperative position. And more,
The WS lever includes a claw portion engageable with an internal tooth formed on an inner peripheral surface of a cover member attached to the frame, a WS protrusion portion extending in an axial direction toward the control plate, Have
The control plate has a WS cam that controls the WS lever to be held in the first inoperative position by contacting the WS protrusion when the webbing winding is completed. The seatbelt retractor according to claim 4 . The WS lever further includes a protrusion for preventing a lock member from protruding in the axial direction toward the spindle,
Between the spindle and the steering wheel, the steering wheel is biased against the spindle so that the lock member is held in the unlocked position and the spindle and the steering wheel rotate together. Means are provided,
A cam groove is formed on the side surface of the spindle to accommodate the protrusion for preventing the lock member from popping out,
The cam groove prevents the lock member from popping out from the lock release position when the WS lever is held in the first inoperative position when the webbing is completely wound. Has a pop-out prevention part engaged with the part,
The WS lever is held in the first non-operating position when the webbing winding is completed, thereby preventing a delay in the rotation of the steering wheel with respect to the spindle and holding the lock member in the unlocked position. The retractor for seat belts of Claim 5 characterized by the above-mentioned. The locking means is displaced to the second operating position from when the webbing is pulled out by the first predetermined amount until it is wound up by the second predetermined amount, thereby rotating the steering wheel in the webbing pulling direction. It further includes an ALR lever that constitutes an automatic locking mechanism to prevent,
The automatic locking mechanism further includes ALR biasing means having one end supported by the steering wheel and the other end supported by the ALR lever.
The ALR lever has an ALR projection extending in the axial direction toward the control plate, and an abutting arm that can abut against the WS lever,
The control plate includes a WS cam that controls the WS lever so that the WS lever is held in the first inoperative position by contacting the WS protrusion when the webbing is completely wound. An ALR cam that abuts the ALR protrusion when the predetermined amount of 1 is pulled out and snaps the ALR lever to the second operating position beyond the dead point of the ALR biasing means; Have
When the ALR lever snaps to the second operating position, the abutting arm portion abuts on the WS lever, and the claw portion of the WS lever is engaged with the internal teeth of the cover member, While preventing rotation of the steering wheel in the webbing pull-out direction,
When the webbing is pulled out for the second predetermined amount after the webbing is pulled out, the WS cam comes into contact with the WS protrusion and the WS lever is moved to the first inoperative position. In this case, when the WS lever contacts and is pressed against the abutting arm, the ALR lever is separated from the WS lever. The seat belt retractor according to claim 6 , wherein the seat belt retractor snaps to a non-operating position beyond a dead point of the ALR biasing means. A spindle that is rotatably supported by the frame and on which the webbing is wound,
A locking member that locks rotation of the spindle in the webbing pull-out direction by engaging with the frame;
A steering wheel that is rotatably supported by the spindle and that operates the lock member by causing a rotation delay with respect to the spindle;
A control plate that rotates at a different speed from the spindle according to the rotation of the spindle;
A mechanism that is pivotally supported by the steering wheel and that displaces between an operating position where rotation of the steering wheel in the webbing pull-out direction is prevented and a non-operation position where rotation of the steering wheel in the webbing pull-out direction is not blocked. Stopping means,
With
The locking means is controlled by the control plate so that one of the operating position and the non-operating position is held under a predetermined webbing condition.
The lock member is controlled by the control plate so as to be held at a lock release position where the lock cannot be engaged with the frame when the winding of the webbing is completed.
The locking means is displaced to the second operating position from when the webbing is pulled out by the first predetermined amount until it is wound up by the second predetermined amount, thereby rotating the steering wheel in the webbing pulling direction. It is an ALR lever that constitutes an automatic locking mechanism to block,
The ALR lever is controlled by the control plate so as to be held in the second operating position from when the webbing is pulled out by a first predetermined amount until it is wound up by a second predetermined amount. A retractor for a seat belt. The automatic locking mechanism further includes ALR biasing means having one end supported by the steering wheel and the other end supported by the ALR lever.
The ALR lever has an ALR projection extending in the axial direction toward the control plate,
The control plate abuts against the ALR projection when the webbing is pulled out by a first predetermined amount, and moves the ALR lever past the dead point of the ALR biasing means to the second operating position. When the webbing is wound up by a second predetermined amount, the snapping operation is performed, and the ALR lever is brought into contact with the ALR lever beyond the dead point of the ALR biasing means in the direction of pulling the webbing of the steering wheel. 9. The seat belt retractor according to claim 8 , further comprising an ALR cam that snaps to a second non-operating position in which rotation is not prevented. A gear speedup having a drive gear that rotates integrally with the spindle, a driven gear that rotates integrally with the control plate and has fewer teeth than the drive gear, and an idle gear that meshes with both the drive and the driven gear. Further comprising a mechanism,
The seat belt retractor according to any one of claims 1 to 9 , wherein the control plate rotates at a speed higher than that of the spindle by the gear speed increasing mechanism.

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