JP2017149385A - Buckle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb kinetic energy of an occupant.SOLUTION: A lift up buckle device 10 comprises: a buckle 12 which a tongue provided in a webbing worn by an occupant is engaged with; and a motor 26 which moves the buckle 12 when activated. An energy absorbing part 78 is provided between the buckle 12 and the motor 26 and absorbs kinetic energy of an occupant as the buckle 12 deforms when pulled with a load exceeding a predetermined load through the tongue.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a buckle device.

  Patent Document 1 below discloses a buckle device including a buckle with which a tongue provided on a webbing attached to an occupant is engaged. The buckle device includes a motor, a movable nut that is moved when the motor is driven, and a connecting wire that connects the movable nut and the buckle. When the motor is driven and the movable nut is moved, the connecting wire is pulled and the buckle is moved.

  By the way, when the occupant moves to the front side of the vehicle, it is desirable that the kinetic energy of the occupant can be absorbed when the buckle is pulled through the webbing and the tongue.

JP 2010-208497 A

  In view of the above facts, an object of the present invention is to provide a buckle device that can absorb the kinetic energy of an occupant.

  The buckle device according to claim 1 is a buckle engaged with a tongue provided on a webbing attached to an occupant, a drive unit that moves the buckle when operated, the buckle, and the drive unit. And an energy absorbing part that absorbs the kinetic energy of the occupant by being deformed when the buckle is pulled with a load exceeding a predetermined load via the tongue.

  The buckle device according to claim 2 is the buckle device according to claim 1, wherein a rotated member rotated by the drive unit is provided between the buckle and the drive unit, and the energy absorbing unit. Is provided on a support portion that rotatably supports the member to be rotated.

  A buckle device according to a third aspect is the buckle device according to the first aspect, wherein a rotated member rotated by the driving portion and a rotated member are engaged between the buckle and the driving portion. And a moving member that is moved by rotating the rotated member to move the buckle, and a portion of the rotated member to which the driving force of the driving unit is transmitted and the movement The part between the part with which the member is engaged is the energy absorbing part.

  According to the buckle device of the first aspect, when the drive unit operates, the buckle moves. A tongue provided on the webbing is engaged with the buckle. Here, when the passenger wearing the webbing moves and the buckle is pulled with a load exceeding a predetermined load via the tongue, the energy absorbing portion is deformed. Thereby, a passenger | crew's kinetic energy can be absorbed.

  According to the buckle device of the second aspect, when the driving unit is operated, the rotated member is rotated and the buckle is moved. Here, when the occupant wearing the webbing moves and the buckle is pulled with a load exceeding a predetermined load via the tongue, the energy absorbing portion of the support portion that supports the member to be rotated is deformed. Thereby, a passenger | crew's kinetic energy can be absorbed.

  According to the buckle device of the third aspect, when the drive unit is operated, the rotated member is rotated. Thereby, the moving member engaged with the rotated member is moved, and the buckle is moved. Here, when the occupant wearing the webbing moves and the buckle is pulled with a load exceeding a predetermined load via the tongue, the portion to which the driving force of the driving portion is transmitted in the rotated member and the moving member are engaged. The part between the joined parts is deformed. Thereby, a passenger | crew's kinetic energy can be absorbed.

It is a disassembled perspective view which decomposes | disassembles and shows a lift-up buckle apparatus. It is a side view showing typically a drive screw etc. when a crew member pulls a buckle with a load exceeding a predetermined load. It is a side view which shows typically a drive screw, a bushing, etc. at the time of a crew member pulling a buckle with a load exceeding a predetermined load. It is a side view which shows typically a drive screw, an energy absorption board, etc. at the time of a crew member pulling a buckle with a load exceeding a predetermined load.

  A buckle device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the following description, the front / rear / left / right / up / down directions will be described, and the front / rear / left / right / up / down directions viewed from the occupant seated on the vehicle seat will be indicated. The arrow UP indicates the upward direction.

  As shown in FIG. 1, a lift-up buckle device 10 as a buckle device of this embodiment includes a buckle 12 that is engaged with a tongue (not shown) provided on a webbing that is attached to an occupant, and a position where the buckle 12 is stored. And a lift-up device 14 that moves to the raised position. Further, the lift-up buckle device 10 includes a buckle upper cover 16 and a buckle lower cover 18 that are attached to the buckle 12, and a lower cover 20 that supports the buckle lower cover 18 so as to be slidable.

(Buckle 12)
The buckle 12 includes an engagement portion (not shown) that engages with the tongue, and a release operation portion that releases the engagement. The buckle 12 has an end portion on one side of a pair of wires 34 to be described later. It is fixed via an anchor 22 and a rivet 24.

(Lift-up device 14)
The lift-up device 14 includes an output shaft 26A (see FIG. 2), a motor 26 serving as a drive unit that can rotate to one side B1 and the other side B2 around the axial direction, and an output shaft 26A of the motor 26. A drive screw 28 as a rotated member engaged with the output shaft 26A so as to rotate integrally therewith, and a slider as a moving member moved along the axial direction of the drive screw 28 as the drive screw 28 rotates. 30. The lift-up device 14 includes a rail 32 that guides the slider 30, a pair of wires 34 that are locked to the slider 30 at the other end and arranged adjacent to each other in the sheet width direction, and a pair of wires 34 A wire guide 36 for guiding the wire 34.

  The motor 26 is a DC motor, and the motor 26 is fixed to the housing 40 via a screw 38 or the like.

  The drive screw 28 is formed in a rod shape using a steel material or the like. The drive screw 28 has a male screw formed along an outer peripheral portion thereof and a slider screwing portion into which a slider 30 described later is screwed. 28B. In addition, an engaging portion 28 </ b> A to which the output shaft 26 </ b> A of the motor 26 is engaged is provided at one end of the drive screw 28 in the longitudinal direction. Furthermore, the end of the drive screw 28 on the other side in the longitudinal direction is a column-shaped supported portion 28C supported by a bushing 46 attached to a wire guide 36 described later. A screw damper 42 formed using an elastic member is interposed between the engaging portion 28A and the output shaft 26A of the motor 26. A portion of the drive screw 28 on the side of the engaging portion 28 </ b> A is rotatably supported by the housing 40 via a bearing 44.

  The slider 30 is formed using a metal material. The slider 30 is inserted into a drive screw engaging portion 30A having a female screw that engages with the slider screwing portion 28B of the drive screw 28, and a wire 34. Wire fixing portion 30B. Then, the other end portion of the wire 34 is not detached from the wire fixing portion 30B by performing caulking or the like in a state where the other end portion of the pair of wires 34 is inserted into the wire fixing portion 30B. The other end of 34 is locked to the wire fixing portion 30B). A piece 48 is fixed to the other end of the wire 34. Further, the slider 30 is formed using a resin material or the like, and a shoe 50 having an outer shape corresponding to an inner shape of a rail 32 described later is attached. The slider 30 moves along with the shoe 50 in the rail 32. The position of the buckle 12 in a state where the slider 30 and the shoe 50 are located on the housing 40 side (the state shown in FIG. 2) is referred to as a “storage position”, and the slider 30 and the shoe 50 are located on the wire guide 36 side. The position of the buckle 12 in the state of being positioned at is referred to as the “upward position”. The direction in which the slider 30 and the shoe 50 move to the housing 40 side is referred to as “sliding direction one side A1”, and the direction in which the slider 30 and the shoe 50 move to the wire guide 36 side is referred to as “sliding direction other side A2”. Shall.

  Further, dampers 52 and 54 are attached to the housing 40 and the wire guide 36. This prevents the shoe 50 moved together with the slider 30 from directly contacting the housing 40 and the wire guide 36.

  The rail 32 is formed by subjecting a steel plate material to press working or the like. The rail 32 is formed in a substantially U-shaped cross section with the lower side open, and includes a slider guide portion 32A in which the drive screw 28, the slider 30, and the like are disposed. A housing 40 is fixed to one side of the rail 32 in the longitudinal direction of the slider guide portion 32A via a screw 56 or the like. Further, a wire guide 36 to be described later is fixed to the other side in the longitudinal direction of the slider guide portion 32 </ b> A in the rail 32. The rail 32 includes a fixing portion 32B having an insertion hole through which a bolt (not shown) is inserted. A bolt (not shown) inserted into the insertion hole of the fixing portion 32B is screwed into a screw hole formed in the seat cushion frame or the like, so that the lift-up buckle device 10 is fixed to the seat cushion frame or the like. It has become. A rail cover 58 is attached to the rail 32. Thus, the open end of the slider guide portion 32A is covered with the rail cover 58. Further, a storage position detection switch 60 is attached to the rail cover 58 so as to be movable along the longitudinal direction of the rail cover 58. The shoe 50 that moves together with the slider 30 is engaged with a storage position detection switch 60 described later, so that the buckle 12 is detected to be in the “storage position”.

  The wire guide 36 is formed in a block shape that is substantially fan-shaped in a side view, and the wire guide 36 is formed with the above-described shaft support hole 36 </ b> A and a guide groove 36 </ b> B that guides the pair of wires 34. . And a part arrange | positioned in the guide groove 36B in a pair of wire 34 in the said guide groove 36B in the state parallel to the depth direction of the guide groove 36B is substantially U-shaped. It is curved in a shape. In this embodiment, the open end side of the guide groove 36B formed in the wire guide 36 is closed by the cover plate 62, so that the pair of wires 34 does not come out of the guide groove 36B.

(Lower cover 20)
The lower cover 20 is formed in a cylindrical shape by using an elastic material such as rubber as an example, and one end of the lower cover 20 is engaged with the wire guide 36. Further, the lower cover 20 is inserted with a wire insertion portion 20A through which the pair of wires 34 are inserted and a curl cord 64 to which a buckle switch for detecting whether or not the tongue is engaged with the buckle 12 is connected. A curl cord insertion portion 20B.

(Buckle lower cover 18)
The buckle lower cover 18 is formed using, for example, a resin material harder than the lower cover 20, and the buckle lower cover 18 covers the buckle 12 together with the buckle upper cover 16. The buckle lower cover 18 is formed in a cylindrical shape by joining an outer cover 18A disposed on one side in the seat width direction and an inner cover 18B disposed on the other side in the seat width direction. The lower cover 20 is inserted into the buckle lower cover 18, so that the buckle lower cover 18 can slide along the lower cover 20. A curl cord bracket 66 attached to the curl cord 64 is engaged with the buckle lower cover 18. Thereby, when the buckle lower cover 18 is slid to the side away from the wire guide 36 with respect to the lower cover 20, the curled cord 64 wound in a spiral shape is stretched.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  When it is detected that an occupant is seated on a vehicle seat equipped with the lift-up buckle device 10 shown in FIG. 1, the motor 26 of the lift-up device 14 rotates the drive screw 28 to one side B1. Then, when the drive screw 28 rotates, the slider 30 moves along the drive screw 28 to the other side A2 in the sliding direction, and the buckle 12 fixed to one end of the wire 34 faces the upper side of the seat. Moved. That is, the buckle 12 is moved from the “storage position” to the “upward position”. As a result, the occupant can easily engage the tongue with the buckle 12. That is, the occupant can easily wear the webbing.

  When it is detected by the buckle switch that the tongue is engaged with the buckle 12, the motor 26 of the lift-up device 14 rotates the drive screw 28 to the other side B2. As a result, the slider 30 moves along the drive screw 28 to the one side A1 in the sliding direction, and the buckle 12 fixed to one end of the wire 34 moves toward the seat lower side. That is, the buckle 12 is moved from the “up position” to the “storage position” side.

  Further, when the vehicle equipped with the lift-up buckle device 10 according to the present embodiment collides or suddenly decelerates, the buckle 12 is pulled through the webbing and the tongue when the occupant moves to the front side of the vehicle. Then, a current in a direction for rotating the output shaft 26A of the motor 26 to the other side B2 is supplied to the motor 26, and the rotation of the one side B1 of the drive screw 28 is limited. When the load with which the buckle 12 is pulled exceeds a predetermined load, as shown in FIG. 2, the engaging portion 28 </ b> A with which the output shaft 26 </ b> A of the motor 26 is engaged and the slider 30 are screwed together. The part (energy absorption part 78) between the parts which are present is deformed. As a result, the slider 30 moves to the other side A2 in the sliding direction by a distance corresponding to the deformation amount of the energy absorbing portion 78. As a result, the kinetic energy of the occupant can be absorbed while moving the buckle 12 in the direction in which the buckle 12 is pulled. In this embodiment, the outer diameter of the portion between the engaging portion 28A to which the output shaft 26A of the motor 26 is engaged in the drive screw 28 and the portion where the slider 30 is screwed is formed by the male screw. By setting the outer diameter to be smaller than the valley diameter of the portion thus formed, the portion functions as the energy absorbing portion 78. As another configuration, the kinetic energy of the passenger may be absorbed by the female screw of the slider 30 deforming the female screw of the drive screw 28. That is, the strength of the female screw may be set so that the female screw of the drive screw 28 functions as the energy absorbing portion 78.

(Other forms of energy absorption)
Next, another form of energy absorption unit will be described with reference to FIGS. 3 and 4.

  As shown in FIG. 3, in this embodiment, an energy absorbing portion 78 is provided in the bushing 46 as a supporting portion that supports the supported portion 28 </ b> C of the drive screw 28. Specifically, the bushing 46 is formed using a metal material in which lubricating oil is impregnated. A through hole 46 </ b> A is formed in the bushing 46 along the rotational axis direction of the drive screw 28. A portion on the drive screw 28 side on the inner peripheral surface of the through hole 46A is a tapered surface 46B set so that the inner diameter dimension increases toward the drive screw 28 side. The supported portion 28C of the drive screw 28 is rotatably supported by the bushing 46 by the end of the supported portion 28C of the drive screw 28 coming into contact with the tapered surface 46B. Further, the surface opposite to the tapered surface 46B on the inner peripheral surface of the through hole 46A is a small-diameter surface 46C set to an inner diameter smaller than the outer dimension of the supported portion 28C of the drive screw 28.

  In the present embodiment described above, when the buckle 12 (see FIG. 1) is pulled through the webbing and the tongue due to the collision or sudden deceleration of the vehicle, the drive screw 28 has a supported portion of the drive screw 28. A force F is generated in a direction in which 28C is pressed toward the tapered surface 46B side of the bushing 46. Then, when the force F exceeds a predetermined value due to the load with which the buckle 12 is pulled exceeding a predetermined load, the inner peripheral portion (energy absorbing portion 78) of the through hole 46A formed in the bushing 46 is deformed. . As a result, the drive screw 28 moves together with the slider 30 to the other side A2 in the sliding direction. As a result, the kinetic energy of the occupant can be absorbed while moving the buckle 12 in the direction in which the buckle 12 is pulled.

  As shown in FIG. 4, in this embodiment, an energy absorbing portion 78 is provided on the energy absorbing plate 80 into which the drive screw 28 is inserted. Specifically, the energy absorbing plate 80 is formed in a rectangular plate shape having a predetermined thickness, and the energy absorbing plate 80 is fixed to the rail 32 (see FIG. 1) or the like. The energy absorbing plate 80 is formed with a circular drive screw insertion hole 80A through which the drive screw 28 is inserted. The inner diameter of the drive screw insertion hole 80A is larger than the outer diameter of the slider screwing portion 28B of the drive screw 28. A slightly larger inner diameter is set. The peripheral portion of the drive screw insertion hole 80 </ b> A is an energy absorbing portion 78. Further, in this embodiment, the portion on the energy absorbing plate 80 side in the engaging portion 28A of the drive screw 28 is a constricted portion 28A1 formed in a shape gradually constricted toward the energy absorbing plate 80 side, The constricted portion 28A1 is disposed in the vicinity of the energy absorbing plate 80.

  In the present embodiment described above, when the buckle 12 (see FIG. 1) is pulled through the webbing and the tongue due to a collision or sudden deceleration of the vehicle, the drive screw 28 has an engaging portion of the drive screw 28. A force F is generated in a direction in which the constricted portion 28A1 in 28A is pressed toward the peripheral edge portion (energy absorbing portion 78) of the drive screw insertion hole 80A formed in the energy absorbing plate 80. Then, when the force F exceeds a predetermined value due to the load with which the buckle 12 is pulled exceeding a predetermined load, the peripheral portion (energy absorption portion 78) of the drive screw insertion hole 80A formed in the energy absorption plate 80 is Deformed. As a result, the drive screw 28 moves together with the slider 30 to the other side A2 in the sliding direction. As a result, the kinetic energy of the occupant can be absorbed while moving the buckle 12 in the direction in which the buckle 12 is pulled.

  In addition, the energy absorption part 78 for absorbing a passenger | crew's kinetic energy should just be provided in the member between the buckle 12 and the motor 26. FIG. Moreover, the energy absorption part 78 may be provided in multiple places.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

10 Lift-up buckle device (buckle device)
12 Buckle 26 Motor (Driver)
28 Drive screw (member to be rotated)
30 Slider (moving member)
46 Bushing (support part)
78 Energy absorber

Claims (3)

A buckle with which a tongue provided on a webbing attached to an occupant is engaged;
A drive unit that is actuated to move the buckle;
An energy absorbing unit that is provided between the buckle and the drive unit and absorbs the kinetic energy of the occupant by being deformed when the buckle is pulled with a load exceeding a predetermined load via the tongue. When,
Buckle device equipped with. Between the buckle and the drive unit, a rotated member that is rotated by the drive unit is provided,
The buckle device according to claim 1, wherein the energy absorbing portion is provided in a support portion that rotatably supports the rotated member. Between the buckle and the drive unit, a rotated member that is rotated by the drive unit, and is engaged with the rotated member and moved by rotating the rotated member so that the buckle is moved. A moving member to be moved, and
2. The buckle device according to claim 1, wherein a portion between a portion where the driving force of the driving portion is transmitted and a portion where the moving member is engaged in the rotated member is the energy absorbing portion.