JP2005185521A - Reclining device of seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining device of seat capable of preventing opening of a gear presser of a guide bracket and also capable of reducing assembling processes for decreasing costs of parts. <P>SOLUTION: An internal gear 9 on a back frame side is supported by the guide bracket 7 on a cushion frame side so as to turn in front and back, and a lock gear 10 is engaged/disengaged with/from the lock gear 9 so as to adjust a front and back inclining position of the back frame with respect to the cushion frame. A lower part of the internal gear 9 is pressed and held by a gear presser member 16 provided on a lower part of the guide bracket 7 so as not to open. An upper part of the guide bracket 7 is pressed and held so as not to open by a gear presser part 21b of a cover bracket 21 which extends along a partial outer circumference of the internal gear 9. In the cover bracket 21, pawls 21c are formed from the gear presser 21b in an approximate L shape so as to be inserted and fixed to inserting holes 9d which are formed on an upper extended part 9a extending on an upper part of the internal gear 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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.

  Also, the lower part of the upper arm is held by the lower presser pin provided at the lower part of the lower arm, and the upper part of the lower arm is not opened by the upper presser pin provided at the upper part of the upper arm. So that the presser foot is held.

On the other hand, with the internal teeth (internal gear) as a separate body, the internal gear is riveted to the back frame, and the internal gear is riveted with a presser member that holds the upper arm of the lower arm (guide bracket) so that it does not open. There is something to stop (see, for example, cited document 2).
JP-A-8-52040 JP-A-9-149832

  However, since the holding member that holds and holds the upper part of the lower arm (guide bracket) is bolted or riveted, the distance between the bolted or riveted part and the holding part of the lower arm (guide bracket) Therefore, there is a problem that when the heavy load is applied to the seat back, the gear presser portion of the presser member is easily opened.

  In addition, since the holding member must be fastened together with other members by bolts or rivets, there is a problem that there are many assembly steps and the cost of parts increases.

  The present invention has been made to solve the above problems, and it is an object of the present invention to provide a seat reclining device in which the gear pressing portion of the guide bracket is difficult to open, the assembly process is small, and the component cost is low. Is.

In order to solve the above-described problems, the present invention provides a cushion frame that has a back frame side internal gear supported by a cushion frame side guide bracket so as to be able to rotate back and forth, and a 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,
The lower portion of the internal gear is pressed and held by a gear pressing member provided at the lower portion of the guide bracket, and the upper portion of the guide bracket extends along a part of the outer periphery of the internal gear. The cover bracket is held so that it does not open at the gear press part of the extended cover bracket. This cover bracket has a claw part formed in a substantially L shape from the gear press part and extends above the internal gear. It is an object of the present invention to provide a seat reclining device, which is fixed by being inserted into an insertion hole formed in an extending portion.

  According to a second aspect of the present invention, the claw portion is fixed by bending the end portion inserted into the insertion hole, welding the end portion to the internal gear, or heat caulking at the end of the end portion. It is preferable.

  According to a third aspect of the present invention, it is preferable that the claw portion is formed with a rib that contacts the inner edge portion of the insertion hole.

  According to a fourth aspect of the present invention, the cover bracket is preferably provided with a spring hooking portion of a spring member that urges the back frame forwardly.

  According to a fifth 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, the upper portion of the guide bracket is held by the cover bracket so as not to be opened by the gear retainer portion of the cover bracket extending along the outer periphery of the internal gear, and the cover bracket is substantially L-shaped from the gear retainer portion. Since the formed claw is inserted into the insertion hole of the internal gear and fixed, the distance between the fixed part of the cover bracket and the gear presser is close, so even when a heavy load is applied to the seat back, the gear presser The part becomes difficult to open.

  Further, since the cover bracket is fixed by inserting the claw portion into the insertion hole of the internal gear, the assembly process is reduced and the parts cost is reduced as compared with the bolt fastening or the rivet fastening.

  According to the second aspect, since the claw portion can be bent, welded, and fixed by heat caulking, the fixing can be performed easily and at a low cost.

  According to the third aspect of the present invention, since the rib that contacts the inner edge portion of the insertion hole is formed on the claw portion, the strength of the claw portion is increased by the rib, the gear presser portion is more difficult to open, and the rib is applied to the insertion hole. The cover bracket will not rattle.

  According to the fourth aspect of the present invention, when the spring hooking portion is formed integrally with the cover bracket, it is not necessary to separately provide the spring hooking portion of the spring member that urges the back frame in the forward-falling direction, thereby reducing the cost.

  According to the fifth aspect, if the cover bracket is also used as a stopper at the maximum front-back 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. 6 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 4, the lower part of the guide bracket 7 is bolted to the cushion frame (not shown) of the seat cushion 2 by bolt holes 7 a, and the back frame 8 of the seat back 3 is The upper extension 9a of the internal gear 9 is fixed by welding (or bolt fixing). For example, as shown in FIG. 2 (c), welding fixing is performed by placing the upper extension portion 9a of the internal gear 9 on the inner side of the back frame 8, so that the upper extension portion 9a is Both sides are welded to both sides of the back frame 8. In this way, the upper extension 9a of the internal gear 9 is directly fixed to the back frame 8 by welding, so that the bracket fixed to the internal gear 9 with a rivet pin is bolted to the back frame 8. , Strength will come up. Note that a protrusion that protrudes from the inside to the outside on the side surface of the internal gear 9 may be inserted into a protrusion hole of the back frame 8 and the protrusion may be fixed to the back frame 8 by welding.

  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. An oval portion 12a of the interlocking shaft 12 inserted into the center hole 9c of the internal gear 9 is fitted into the center hole 11a so as not to rotate. 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 to 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 14a. 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, 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 to be internal. By engaging with the internal teeth 9 b of the gear 9, the internal gear 9 is locked with respect to the guide bracket 7, and the knob 14 d is pulled upward so that the operation lever 14 is resisted against the biasing force of the coil spring 17. When rotating upward, 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 diameter reducing direction, and the tooth is disengaged from the internal teeth 9b of the internal gear 9, whereby the guide bracket 7, the internal gear 9 is unlocked.

  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.

  As shown in detail in FIG. 5, the cover bracket 21 is bent in a mountain shape in front view so as to extend along a part of the outer periphery of the internal gear 9, for example, about ¼ (about 90 degrees). In addition, a claw portion 21c is formed at a bent end portion 21f that is bent straightly rearward in an L shape from the upper end of the gear presser portion 21b in a side view. It is preferable that a pair of the gear pressing portion 21b, the bent end portion 21f, and the claw portion 21c are formed on the front and rear in the rotational direction of the internal gear 9.

  An insertion hole 9 d for inserting the claw portion 21 c of the cover bracket 21 from the front is formed in the upper extension portion 9 a of the internal gear 9. The insertion hole 9d is preferably set to a width dimension in which the claw portion 21c is inserted without rattling in the plate thickness direction. However, since the plate thickness of the upper extension portion 9a is thick, the mold life is considered. It is difficult to punch out the narrow insertion hole 9d with a press. Therefore, the insertion hole 9d is set to be wide enough to be punched out by a press, and the rib 21d is made to contact the inner edge of the insertion hole 9d by substantially increasing the plate thickness of the claw part 21c. It is preferable to form (see FIG. 5F).

  The claw portion 21c of the cover bracket 21 is fixed to the upper extension portion 9a by being inserted into the insertion hole 9d and bending the end portion 21e [see FIG. 5 (e)]. The end 21e may be shortened and fixed to the internal gear 9 by welding, or the end of the end 21e may be fixed with heat caulking.

  The cover bracket 21 has a bent end portion 21f slightly wider than the thickness of the guide bracket 7 in contact with the front surface of the internal gear 9, and is positioned in the front-rear direction. The upper part of the presser is held so that it does not open outward. It is preferable that the guide bracket 7 is pressed by the entire surface of the gear presser 21b or the guide bracket 7 is pressed by the projection 21g formed on the gear presser 21b.

  The front end edge 21h of the cover bracket 21 functions as a stopper for the maximum forward tilt position of the back frame 8 when it rotates forward together with the back frame 8 and comes into contact with the front upper edge 15d of the bracket 15 of the guide bracket 7. The rear end edge portion 21i functions as a stopper at the maximum rearward tilt position of the back frame 8 when the rear end edge portion 21i rotates rearward together with the back frame 8 and comes into contact with the rear upper edge portion 15e of the bracket 15 of the guide bracket 7. [See FIG. 3 (a)].

  If the reclining device 5 is configured as described above, the lower portion of the internal gear 9 is held by the head 16b of the caulking pin 16 so as not to open inward, and the upper portion of the guide bracket 7 is connected to the internal gear 9. The cover bracket 21 is held so as not to be opened by the gear presser portion 21b of the cover bracket 21 extending along the outer periphery of the cover bracket 21. The cover bracket 21 is a claw portion that is bent straight rearward from the gear presser portion 21b in a substantially L shape. Since 21c is inserted into the insertion hole 9d of the internal gear 9 and fixed, the distance between the fixing portion of the cover bracket 21 and the gear pressing portion 21b becomes close, so even when a large load acts on the seat back 3. The gear presser 21b is difficult to open.

  In addition, since the cover bracket 21 is fixed by inserting the claw portion 21c into the insertion hole 9d of the internal gear 9, the assemblability is improved as compared with bolt fastening or rivet fastening.

  Furthermore, the claw portion 21c can be fixed by being bent, welded, or crimped by heat, so that fixing can be performed easily and at a low cost.

  Furthermore, since the rib 21d that contacts the inner edge of the insertion hole 9d is formed in the claw portion 21c, the strength of the claw portion 21c is increased by the rib 21d, and the gear presser portion 21b is more difficult to open, and the insertion hole 9d The rib 21d contacts and the cover bracket 21 does not rattle.

  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. 6, 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.

It is a perspective view of a reclining device. It is the reclining device which fixed the back frame, (a) is a front view, (b) is a side view, (c) is a rear view. It is a reclining device, (a) is a front view, (b) is a side view. It is a disassembled perspective view of a reclining apparatus. (A) is a front perspective view, (b) is a rear perspective view, (c) is a plan view, (d) is a front view, (e) is a side view, and (f) is a cover bracket. It is an expanded sectional view of the insertion part of the nail | claw part. It is a side view of a vehicle seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 3 Seat back 5 Reclining device 7 Guide bracket 8 Back frame 9 Internal gear 9a Upper extension 9b Internal tooth 9d Insertion hole 10 Lock gear 11 Cam 12 Interlocking shaft 15 Bracket 16 Caulking pin 19 Spiral spring 21 Cover Bracket 21a Spring hook 21b Gear presser 21c Claw 21d Rib 21f Bending end 21h Front end edge 21i Rear end edge

Claims (5)

The back frame side internal gear is supported by the guide bracket on 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, thereby adjusting the back frame front and rear tilt position with respect to the cushion frame. In such a seat reclining device,
The lower portion of the internal gear is pressed and held by a gear pressing member provided at the lower portion of the guide bracket, and the upper portion of the guide bracket extends along a part of the outer periphery of the internal gear. The cover bracket is held so that it does not open at the gear press part of the extended cover bracket. This cover bracket has a claw part formed in a substantially L shape extending from the gear press part above the internal gear. A seat reclining device, wherein the seat reclining device is fixed by being inserted into an insertion hole formed in an extending portion.   2. The seat reclining device according to claim 1, wherein the claw portion is fixed by bending the end portion inserted into the insertion hole, welding the end portion to an internal gear, or heat caulking at the end of the end portion.   The seat reclining device according to claim 1 or 2, wherein a rib that abuts against an inner edge of the insertion hole is formed in the claw portion.   The seat reclining device according to any one of claims 1 to 3, 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 front-rear tilt position of the back frame when abutting against the guide bracket, respectively. The seat reclining device described in 1.

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