JP2005186646A - Reclining device of vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining device for a vehicle seat capable of preventing deformation of a back frame effectively by devising the shape of an internal gear. <P>SOLUTION: The reclining device of the vehicle seat structured so that the internal gear 9 fixed to the back frame 8 is supported on a guide bracket 7 fixed to a cushion frame rotatably fore and aft and a lock gear 10 is engaged with the internal gear 9 and disengaged from it so as to adjust the fore-and-aft inclining position of the back frame 8 relative to the cushion frame, wherein the side frame of the internal gear 9 is fixed to the back frame 8, and an upper extension part 9a formed in the upper part of the internal gear 9 is secured to the back frame 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seat reclining device.

  Conventionally, for example, in a vehicle seat, 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 by engaging and disengaging the lock gear with the internal gear, There is a seat reclining device in which the back and forth tilt position of the back frame is adjusted with respect to the cushion frame (see, for example, Patent Document 1).

In this reclining device, the lower portion of the guide bracket is fixed to the cushion frame with a bolt, and the protrusion of the internal gear is fitted into the protrusion hole of the back frame and fixed by welding.
JP 2000-333757 A

  However, since the back frame is only welded and fixed to the protrusions of the internal gear, the back frame may be deformed when a large load is applied to the seat back.

  Some internal gears and back brackets that are thicker than the back frame are welded and fixed, and the back brackets are welded and fixed to the back frame to reinforce the back frame. The attachment cost also becomes high (prior art 2).

  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 can effectively prevent the deformation of the back frame by devising the shape of the internal gear.

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,
Provided is a seat reclining device in which a side surface of the internal gear is fixed to a back frame, and an upper extension formed on an upper portion of the internal gear is fixed to the back frame. It is.

  Preferably, the cushion side frame is fixed to the side surface of the guide bracket, and the lower extension formed at the lower portion of the guide bracket is fixed to the cushion side frame. .

  According to the present invention, after fixing the side surface of the internal gear to the back frame, by fixing the upper extension portion of the internal gear to the back frame, the back frame is reinforced by the upper extension portion, Deformation of the back frame can be effectively prevented.

  Further, it is not necessary to weld and fix a thicker back bracket to the internal gear than in the case of the back frame as in the prior art 2, and only an upper extending portion is formed in the internal gear, so that the weight increases. The assembly cost does not increase.

  According to the second aspect, the cushion side frame is fixed to the side surface of the guide bracket, and the lower extension portion of the guide bracket is fixed to the cushion side frame, whereby the cushion side frame is reinforced by the lower extension portion. Thus, deformation of the cushion side frame can be effectively prevented.

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

  FIG. 7 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. As other fixing methods, there are a method of fixing the upper extending portion 9a and the back frame 8 with caulking pins or bolts, or a method of fixing the upper extending portion 9a with a cut-and-raised portion formed on 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 7) 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. A positioning hole 21d that can be inserted into the upper extension 9a of the internal gear 9 is formed in the upper portion of the cover bracket 21.

  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). Note that both side edges of the upper extension 9 a provided on the outer periphery of the internal gear 9 and the inner edge of the positioning hole 21 d 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 protrusion 9d of the internal gear 9 is fitted into the protrusion hole 8b of the back frame 8 and fixed by welding, and then the upper extension 9a of the internal gear 9 is fixed. By welding and fixing to the back frame 8, the back frame 8 is reinforced by the upper extending portion 9a, and deformation of the back frame 8 can be effectively prevented.

  Further, since only the upper extending portion 9a is formed in the internal gear 9, the weight does not increase and the assembling cost does not increase.

  Further, by using the upper extension portion 9a of the internal gear 9 and welding and fixing with the positioning hole 21d of the cover bracket 21 inserted, the internal gear 9 is accurately positioned and fixed. Since the upper extending portion 9a, which is a portion, to the gear presser portion 21b is shortened, the gear presser portion 21b is 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 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, by directly welding and fixing the upper extending portion 9a of the internal gear 9 to the back frame 8, the protruding portion 9d of the internal gear 9 is fitted into the protruding portion hole 8b of the back frame 8 and fixed by welding. Compared with the case where only it exists, since the part far from the center is fixed, the strength is increased.

  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 extending portion 9a of the internal gear 9 by press deformation. As a result, there is no thermal strain, no need for welding, and continuous fixing is possible only by pressing.

  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 rivet pins is bolted to the back frame 8, as shown in FIG. 7, 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.

  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.

  Further, in FIG. 6, the fixing portion 7f on the side surface of the guide bracket 7 is fixed to the cushion side frame 30, and the lower extending portion 7d of the guide bracket 7 is fixed to the cushion side frame 30 by the fixing portion 7f. The cushion side frame 30 is reinforced by the lower extending portion 7d, and the deformation of the cushion side frame 30 can be effectively prevented.

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 dowel welding state of the internal gear with respect to a back frame. It is a side view of the fixed modification of a guide bracket. It is a side view of a vehicle seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 3 Seat back 5 Reclining device 7 Guide bracket 7d Lower extension part 8 Back frame 8b Projection hole 8c Projection part 9 Internal gear 9a Upper extension part 9b Inner tooth 9c Projection part 9d Positioning hole 9e Groove part DESCRIPTION OF SYMBOLS 10 Lock gear 11 Cam 12 Interlocking shaft 15 Bracket 16 Caulking pin 19 Spiral spring 21 Cover bracket 21a Spring hook part 21b Gear presser part 21d Positioning hole 21e Inner edge part 21h Front end edge part 21i Rear end edge part 30 Cushion side frame

Claims (2)

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,
A reclining device for a seat, characterized in that a side surface of the internal gear is fixed to a back frame, and an upper extending portion formed at an upper portion of the internal gear is fixed to the back frame.   The seat reclining device according to claim 1, wherein a cushion side frame is fixed to a side surface of the guide bracket, and a lower extending portion formed at a lower portion of the guide bracket is fixed to the cushion side frame.

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