JP2005177310A - Seat reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat reclining device in which internal gears are not damaged and a gear presser is not opened by eliminating a back bracket.
SOLUTION: An internal gear 9 fixed to a back frame 8 side is supported by a guide bracket 7 fixed to a cushion frame side so as to be able to rotate back and forth, and a lock gear 10 is engaged with and disengaged from the internal gear 9. In the seat reclining device in which the back and forth tilt position of the back frame 8 is adjusted with respect to the cushion frame, the internal gear 9 and the lower portion of the guide bracket 7 are gears provided to prevent the opening of both. While being held by the holding member 16 so as not to be opened, the upper portion of the guide bracket 7 is fixed to the upper portion of the internal gear 9 and extends along a part of the outer periphery of the internal gear 9. The presser is held so as not to be sandwiched and opened by the existing cover bracket 21.
[Selection] Figure 2

Description

  The present invention relates to a seat reclining device.

  2. Description of the Related Art Conventionally, for example, in a vehicle seat, an upper arm on a seat back side is supported by a lower arm on a seat cushion side so as to be able to pivot back and forth, and a pole is engaged with and disengaged from an inner tooth of the upper arm. There is a reclining device that adjusts the back and forth tilt position of the back (see, for example, Patent Document 1).

  In this reclining device, the lower part of the lower arm is fixed to the cushion frame with bolts, and the upper part of the upper arm is fixed to the back frame with bolts.

  The lower part of the upper arm is held by a lower presser bracket provided at the lower part of the lower arm, and the upper part of the lower arm is an upper presser bracket that is fastened with bolts to the upper part of the upper arm. The presser is held so as not to open (first prior art).

On the other hand, the upper arm (back bracket) and the internal teeth (internal gear) are separated, and the internal gear and the back bracket are caulked with rivets, and the upper bracket is held by the back bracket so that the upper part of the lower arm does not open. Some of them have a gear presser portion (conventional technology 2).
JP 2001-128768 A

  However, since the distance between the center of rotation of the upper arm (back bracket) and the position where the bolt is fixed to the seat back is long, when a heavy load acts on the seat back, the internal teeth (internal gear) The stress concentrates on the boundary between the upper arm (back bracket) and the internal gear, and the upper arm (back bracket) itself may be deformed. Moreover, there is a possibility that the bolt hole of the upper arm (back bracket) extends and rattles. Furthermore, since the upper arm (back bracket) is large, it does not look good.

  In particular, in the prior art 2, since the internal gear and the back bracket are crimped with rivets, the cost is high, and a dedicated back bracket is required for each vehicle type. Since the length to the presser part is long, the gear presser part is easy to open.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a seat reclining device that eliminates damage to the internal gear and the opening of the gear pressing portion by eliminating the back bracket. Is.

In order to solve the above-mentioned problems, the present invention is configured such that an internal gear fixed to the back frame side is supported by a guide bracket fixed to the cushion frame side so as to be able to rotate back and forth, and the lock gear is engaged with and disengaged from the internal gear. In the seat reclining device that adjusts the back and forth tilt position of the back frame with respect to the cushion frame,
The internal gear and the lower part of the guide bracket are held and held so as not to be opened by being sandwiched by a gear pressing member provided to prevent the opening of both, and the upper part of the guide bracket is connected to the internal gear. The seat reclining device is characterized in that it is held by a cover bracket that is fixed to the upper portion of the inner gear and is sandwiched by a cover bracket extending along a part of the outer periphery of the internal gear so as not to be opened. .

  The cover bracket is fixed to the internal gear with the positioning hole formed in the cover bracket inserted into the upper extension formed in the upper part of the internal gear. A configuration is preferable.

  According to a third aspect of the present invention, it is preferable that the inner edge portion of the positioning hole of the cover bracket is bitten into the groove portions formed at both side edge portions of the upper extending portion by press deformation and fixed.

  According to a fourth aspect of the present invention, the gear pressing member provided at the lower portion of the internal gear and the guide bracket is fixed to the lower portion of the internal gear or the guide bracket and extends along a part of the outer periphery of the guide bracket. It is preferable that the cover bracket is configured to be held by the cover bracket so that the internal gear and the lower part of the cover bracket are not opened.

  As in claim 5, the cover bracket is fixed to the guide bracket in a state where the positioning hole formed in the cover bracket is inserted into the upper extension portion formed in the upper portion of the guide bracket. It is preferable that the cover bracket is fixed to the guide bracket in a state where the positioning hole formed in the cover bracket is inserted into the lower extending portion formed in the lower portion of the guide bracket.

  According to a sixth aspect of the present invention, it is preferable that a spring hooking portion of a spring member for urging the back frame forward is formed on the cover bracket.

  According to a seventh aspect of the present invention, the front end edge portion and the rear end edge portion of the cover bracket in the front-rear rotation direction are stoppers at the maximum front-rear tilt position of the back frame when abutting against the guide bracket. It is preferable.

  According to the present invention, basically, the back bracket is eliminated and the internal gear is directly fixed to the back frame by welding. The lower part of the internal gear and the guide bracket is held by a gear presser member provided to prevent the opening of the both, so as not to be opened, and the upper part of the guide bracket is It is fixed to the top of the null gear and is held by the cover bracket gear retainer that extends along a part of the outer periphery of the internal gear so as not to open.

  This causes problems due to the presence of the back bracket, that is, damage to the internal gear when a large load is applied to the seat back, deformation of the back bracket itself, extension of the bolt holes for the back bracket, and appearance of the back bracket. , Rivet caulking and high cost due to a dedicated back bracket, opening of the gear presser, etc. are eliminated.

  In addition, the cover bracket is not a part of the outer periphery of the guide bracket that is held between the gear holders so that it does not open. The structure is simpler and easier to manufacture than the holding type, and the spring hooking portion of the spring member that urges the back frame in the forward direction can be integrally formed.

  According to the second aspect, the cover bracket is accurately positioned with respect to the internal gear by fixing the positioning hole inserted into the upper extending portion of the upper portion of the internal gear, and from the fixing portion. Since the distance to the gear presser is shortened, the gear presser is more difficult to open. Further, since the cover bracket is small, it can be manufactured light weight and at a low cost.

  According to claim 3, the cover bracket is fixed by causing the inner edge portion of the positioning hole to bite into the groove portions of the both side edge portions of the upper extension portion of the internal gear by press deformation, thereby fixing the cover bracket. There is no thermal distortion, no need for welding, and it can be fixed continuously only by pressing.

  According to the fourth aspect of the present invention, if the cover bracket is used instead of the gear holding member that holds the internal gear and the lower part of the cover bracket so as not to be opened, the upper part of the internal gear is prevented from being opened and held. Since it is possible to share parts with the cover bracket, the cost is reduced.

  According to claim 5, the cover bracket is fixed in a state in which the positioning hole is inserted into the upper extension portion of the guide bracket, and is fixed in a state in which the positioning hole is inserted into the lower extension portion of the guide bracket, It will be accurately positioned with respect to the cover bracket.

  According to the sixth aspect, if the spring hooking portion is formed integrally with the cover bracket, it is not necessary to separately provide a spring hooking portion of the spring member that urges the back frame in the forward direction, and the cost is reduced.

  According to the seventh aspect, if the cover bracket is also used as a stopper at the maximum back-and-forth tilt position of the back frame, it is not necessary to provide a separate stopper and the cost is reduced.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 8 shows a vehicle seat 1 in which a seat cushion 2 is supported by a seat slider 4 so as to be slidable back and forth (see arrow a), and a seat back 3 is provided between the seat cushion 2 and the seat cushion 2. The reclining device 5 is supported so as to be tiltable back and forth (see arrow b).

  As shown in FIGS. 1 to 3, the lower part of the guide bracket 7 is bolted to a cushion frame (not shown) of the seat cushion 2 by a bolt hole 7 a.

  Further, the back frame 8 of the seat back 3 is formed with protrusion holes 8b at equal circumferential intervals (in this example, equal to 6) with respect to the reclining center hole 8a of the back frame 8, Protrusions 9d that are fitted into the respective projection hole 8b are formed integrally on the side surface of the internal gear 9 from the inner surface toward the outer surface. Among the projections 9d that are fitted into the respective projection hole 8b, an appropriate one is provided. As shown by hatching in FIG. 5, for example, the projections 9 d at three equal positions on the circumference are fixed to the back frame 8 by welding.

  Further, as shown in FIG. 3, the upper extending portion 9a formed at the upper part of the outer periphery of the internal gear 9 is applied to the outer surface of the protruding portion 8c of the back frame 8, and the The upper side and both sides of the extending portion 9a are welded to both sides of the back frame 8.

  In the state where the guide bracket 7 and the internal gear 9 are overlapped face-to-face, the fitting recess and the fitting projection are relatively fitted (both are not specifically shown), and the guide. An internal gear 9 is supported on the bracket 7 so as to be rotatable in the front-rear direction.

  The internal gear 9 is formed with internal teeth 9b, and a pair of lock gears 10 and a cam 11 guided by the guide bracket 7 are accommodated in the internal space of the internal teeth 9b. In the center hole 11a, an oval portion 12a of the interlocking shaft 12 inserted into the center hole 9c of the internal gear 9 from the center hole 8a of the back frame 8 is fitted non-rotatably. The interlocking shaft 12 interlocks the reclining devices on the left and right sides of the vehicle seat 1.

  A central convex portion 14a of the operation lever 14 is rotatably fitted in the large-diameter central hole 7b of the guide bracket 7 from the outer surface, and the cam 11 is inserted into the oval central hole 14b of the central convex portion 14. The oval portion 12a of the inserted interlocking shaft 12 is fitted so as not to rotate.

  On the outer surface of the guide bracket 7 is disposed a bracket 15 that holds and holds the oval center hole 14b of the operation lever 14 so as not to come out from the oval portion 12a of the interlocking shaft 12. The caulking hole 15a is caulked and fixed to the shaft portion 16a that protrudes outward from the caulking pin 16 that is caulked from the inner surface side to the caulking hole 7c below the guide bracket 7.

  The head portion 16b of the caulking pin 16 also serves as a gear pressing member that holds and holds the lower portion of the internal gear 9 so as not to open inwardly on the inner surface side of the guide bracket 7 (see FIG. 3B).

  A coil spring 17 is stretched between the spring hooking portion 14 c of the operation lever 14 and the spring hooking portion 15 b of the bracket 15, and the operation lever 14 is urged downward (locking direction) by the coil spring 17.

  When the operation lever 14 is rotated downward by the urging force of the coil spring 17, the interlocking shaft 12 is rotated forward, the cam 11 is rotated around one direction, and the lock gear 10 is moved in the diameter-expanding direction. By engaging with the internal teeth 9b of the null gear 9, the internal gear 9 is locked with respect to the guide bracket 7, and the knob 14d (see FIGS. 3 and 8) is pulled upward to move the operating lever 14 to the coil. When the spring 17 is rotated upward against the urging force of the spring 17, the interlocking shaft 12 is rotated in the reverse direction, the cam 11 is rotated in the other direction, the lock gear 10 is moved in the reduced diameter direction, and the internal teeth 9b of the internal gear 9 are rotated. The internal gear 9 is unlocked with respect to the guide bracket 7 by removing the tooth from.

  A spiral spring 19 is disposed on the outer surface of the bracket 15, and an inner end portion 19 a of the spiral spring 19 is locked to a spring hook portion 15 c of the bracket 15, and an outer end portion 19 b is an interface described later. It is locked to the spring hooking portion 21 a of the cover bracket 21 of the null gear 9. When the internal gear 9 is unlocked with respect to the guide bracket 7, the spiral spring 19 moves the seat back 3 forward by an urging force.

  The cover bracket 21 is bent in a mountain shape when viewed from the front so as to extend along about 1/4 (about 90 degrees) of the outer periphery of the internal gear 9, and is formed in a downward U-shape when viewed from the side. Has been. In the upper part of the cover bracket 21, a positioning hole 21d that can be inserted into an upper extension 9a provided on the outer periphery of the internal gear 9 is formed.

  Then, as shown in FIG. 4A, the positioning hole 21d of the cover bracket 21 is inserted into the upper extending portion 9a of the internal gear 9 (see arrow d), as shown in FIGS. 4B and 4C. Further, the inner edge portion 21e of the positioning hole 21d of the cover bracket 21 is fixed in the groove portions 9e formed on both side edge portions of the upper extension portion 9a by press deformation (see arrow e). It should be noted that both side edge portions of the upper extension portion 9a of the internal gear 9 and the inner edge portion of the positioning hole 21d of the cover bracket 21 may be fixed by welding.

  The cover bracket 21 is positioned in the front-rear direction with the rear side portion 21c abutting against the rear surface of the internal gear 9. In this state, the gear presser portion 21b is pressed so that the upper portion of the guide bracket 7 does not open outward. keeping. It is preferable that the guide bracket 7 is pressed on the entire surface of the gear pressing portion 21b or the guide bracket 7 is pressed in a dotted manner with the projection 21f formed on the gear pressing portion 21b.

  As shown in FIG. 3A, when the front edge 21g of the cover bracket 21 rotates forward together with the back frame 8 and contacts the front upper edge 15d of the bracket 15 of the guide bracket 7, the back frame 8, the front end edge portion 21 h rotates rearward together with the back frame 8 and comes into contact with the rear upper edge portion 15 e of the bracket 15 of the guide bracket 7. It functions as a stopper for the maximum backward tilt position.

  If the reclining device 5 is configured as described above, the back bracket is basically abolished and the protrusion 9d of the internal gear 9 is fitted into the protrusion hole 8b of the back frame 8 and positioned. The internal gear 9 is fixed directly to the back frame 8 by welding. The lower portion of the internal gear 9 is pressed and held so as not to be opened by the head 16b of the caulking pin 16 below the guide bracket 7, and the upper portion of the guide bracket 7 is fixed to the upper portion of the internal gear 9. The presser foot is held so as not to be pinched by the gear presser portion 21b of the cover bracket 21 extending along the outer periphery of the internal gear 9.

  As a result, problems caused by the presence of the back bracket, that is, damage to the internal gear 9 when a large load is applied to the seat back 3, deformation of the back bracket itself, extension of bolt holes in the back bracket, back bracket , The cost of rivet caulking and a dedicated back bracket, and the opening of the gear presser are eliminated.

  Further, the cover bracket 21 does not hold the entire outer periphery of the guide bracket 7 with the gear presser 21b so as not to be opened, but is a part of the outer periphery (for example, 1/4 turn). Compared with the type in which the rivets are held by caulking, the structure is simple and manufacture is easy, and the spring hooking portion 21a of the spiral spring 19 that urges the back frame 8 in the forward-falling direction can be integrally formed.

  Further, the upper extension 9a of the internal gear 9 is directly fixed to the back frame 8 by welding, so that the strength of the bracket fixed to the internal gear 9 with a rivet pin is bolted to the back frame 8. Will come up.

  Further, the cover bracket 21 is positioned accurately with respect to the internal gear 9 by fixing the positioning hole 21d inserted into the upper extending portion 9a of the upper portion of the internal gear 9, and at the fixing portion. Since the upper extension portion 9a to the gear presser portion 21b are shortened, the gear presser portion 21b is more difficult to open. Moreover, since the cover bracket 21 is small, it can be manufactured light weight and at a low cost.

  Further, the cover bracket 21 is compared with welding fixing by fixing the inner edge portion 21e of the positioning hole 21d by pressing deformation into the groove portions 9e on both side edge portions of the upper extension portion 9a of the internal gear 9. As a result, there is no thermal distortion, no need for welding, and continuous fixing is possible only by pressing.

  In addition, since the spring hooking portion 21a is integrally formed with the cover bracket 21, it is not necessary to separately provide the spring hooking portion of the spiral spring 19 that urges the back frame 8 in the forward-falling direction, thereby reducing the cost.

  Furthermore, since the cover bracket 21 can also be used as a stopper at the maximum forward / backward tilt position of the back frame 8, it is not necessary to provide a separate stopper and the cost is reduced.

  Furthermore, when the bracket fixed to the internal gear 9 with a rivet pin is bolted to the back frame 8, as shown in FIG. 8, from the gap 24 between the side cover 23 and the lower portion of the seat back 3. Since the bracket is visible, it is necessary to paint the bracket. However, since the cover bracket 21 is small and fits in the side cover 23, it is not necessary to paint the cover bracket 21.

  In the above embodiment, the head portion 16b of the caulking pin 16 below the guide bracket 7 also serves as a gear pressing member that holds the inner gear 9 so that the lower portion of the internal gear 9 does not open inward on the inner surface side of the guide bracket 7. However, as shown in FIG. 6, a cover bracket 21 ′ having substantially the same structure as the cover bracket 21 can be used instead of the caulking pin 16.

  That is, the lower extension portion 7d is formed in the lower portion of the outer periphery of the guide bracket 7, and the positioning hole 21d of the cover bracket 21 'is inserted and fixed to the lower extension portion 7d, so that the gear presser portion 21b can The lower portion of the gear 9 is sandwiched so as not to open outward and is held.

  Since this guide bracket 7 does not have a bolt hole 7a for bolting the lower part to a cushion frame (not shown) of the seat cushion 2, a rear side portion 21c and a lower extension portion 7d of the cover bracket 21 are provided. The three places indicated by x are fixed to the cushion frame by welding.

  In this configuration, the cover bracket 21 ′ is used in place of the caulking pin 16 that holds and holds the lower portion of the internal gear 9 so as not to be opened, so that the upper portion of the internal gear 9 is prevented from being opened. Since it is possible to share parts with the cover bracket 21 to be held, the cost is reduced.

  A lower extension portion is formed in the lower portion of the internal gear 9, and a positioning hole 21d of the cover bracket 21 'is inserted and fixed in the lower extension portion, so that the lower portion of the guide bracket 7 is lowered by the gear press portion 21b. It is also possible to hold the presser by pinching it so that it does not open outward.

  As shown in FIG. 7, a lower extension 7d is formed at the lower portion of the outer periphery of the guide bracket 7, and a lower extension 7e is formed at the upper portion of the outer periphery.

  Then, by inserting and fixing the positioning hole 21d of the cover bracket 21 'in the lower extension portion 7d, the lower portion of the internal gear 9 is sandwiched and held so as not to open outward by the gear pressing portion 21b, and held. By inserting and fixing the positioning hole 21d of the cover bracket 21 into the upper extending portion 7e, the upper portion of the internal gear 9 can be sandwiched and held by the gear pressing portion 21b so as not to open outward.

  In this way, the cover brackets 21 and 21 ′ are accurately positioned with respect to the guide bracket 7.

  Further, if the guide bracket 7 and the internal gear 9 are formed with stepped portions 7f and 9f, and the cover brackets 21 and 21 'are fitted into the stepped portions 7f and 9f, the guide bracket 7 and the internal gear 9 are fitted. The frame mounting surface 9 is flat.

  Furthermore, if the protrusion 7g is formed on the back surface of the guide bracket, the guide bracket can be fixed to the frame.

It is a perspective view of a reclining device. It is a disassembled perspective view of a reclining apparatus. It is a reclining device, (a) is a front view, (b) is a side view. The relationship between a guide bracket, an internal gear, and a guide bracket is shown, (a) is an exploded perspective view, (b) is an assembled front sectional view, and (c) is a sectional view taken along line AA in (b). It is a perspective view of the protrusion part welding state of the internal gear with respect to a back frame. It is a perspective view of the fixed modification of a cover bracket. It is a fixed modification of a cover bracket and an internal gear, (a) is a perspective view, (b) is a side view. It is a side view of a sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 3 Seat back 5 Reclining device 7 Guide bracket 7d Lower extension part 7e Upper extension part 8 Back frame 8b Projection hole 8c Projection part 9 Internal gear 9a Upper extension part 9b Internal tooth 9c Center hole 9d Protrusion 9e Groove 10 Lock gear 11 Cam 12 Interlock shaft 15 Bracket 16 Caulking pin 19 Spiral spring 21 Cover bracket 21 'Cover bracket 21a Spring hook 21b Gear presser 21d Positioning hole 21e Inner edge 21h Front edge 21i Rear edge

Claims (7)

An internal gear fixed to the back frame side is supported by the guide bracket fixed to the cushion frame side so as to be able to rotate back and forth, and by engaging and disengaging the lock gear with the internal gear, the back frame In the seat reclining device that adjusts the forward and backward tilt position,
The internal gear and the lower part of the guide bracket are held and held so as not to be opened by being sandwiched by a gear pressing member provided to prevent the opening of both, and the upper part of the guide bracket is connected to the internal gear. A seat reclining device, wherein the seat reclining device is held by a cover bracket that is fixed to the upper portion of the inner gear and that is sandwiched by a cover bracket that extends along a part of the outer periphery of the internal gear.   The seat bracket according to claim 1, wherein the cover bracket is fixed to the internal gear in a state where a positioning hole formed in the cover bracket is inserted into an upper extension portion formed in an upper portion of the internal gear. Reclining device.   The seat reclining device according to claim 2, wherein the inner edge portion of the positioning hole of the cover bracket is bitten into the groove portions formed at both side edge portions of the upper extending portion by press deformation.   The gear holding member provided at the lower portion of the internal gear and the guide bracket is a cover bracket that is fixed to the lower portion of the internal gear or the guide bracket and extends along a part of the outer periphery of the guide bracket. The seat reclining device according to any one of claims 1 to 3, wherein the seat reclining device is held by a cover bracket so as not to open an internal gear and a lower portion of the cover bracket.   The cover bracket is fixed to the guide bracket in a state where the positioning hole formed in the cover bracket is inserted into the upper extension portion formed in the upper portion of the guide bracket, and is formed in the lower portion of the guide bracket. The seat reclining device according to claim 1, wherein the cover bracket is fixed to the guide bracket in a state where the positioning hole formed in the cover bracket is inserted into the lower extending portion.   The seat reclining device according to any one of claims 1 to 5, wherein a spring hooking portion of a spring member that urges the back frame forwardly is formed on the cover bracket.   The front end edge portion and the rear end edge portion of the cover bracket in the front-rear rotation direction are stoppers at the maximum back-and-forth tilt position of the back frame when abutting against the guide bracket, respectively. The seat reclining device described in 1.

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