JP5281857B2 - Reclining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining device with improved capability of assembling an arcuate bar spring for turnably urging a cam. <P>SOLUTION: The reclining device 10 includes: a locking gear 5 movably supported relative to a base plate 2; the cam 6 turnably disposed to control the movement of the locking gear; and the arcuate bar spring 8 to urge the cam in a specific direction of turning. The arcuate bar spring 8 has first and second locking ends 81 and 82. By inserting the first locking end 81 into a first locking hole 62 provided in the cam 6, and inserting the second locking end 82 into a second locking hole 24 provided in the base plate 2, the bar spring 8 is attached to turnably urge the cam 6. At least one of the first and second locking ends 81 and 82 of the arcuate bar spring 8 has a tapered portion 83 inclined relative to the axis L of the locking end. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a reclining device for a vehicle seat. In particular, the present invention relates to an improvement in the assembling property of a spring which is a component of the reclining device.

  2. Description of the Related Art A reclining device of a type that supports a seat back (backrest portion) so as to be tiltable with respect to a seat cushion (seat portion) and can switch a seat back between a locked state and an unlocked state is known. Such a reclining device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-151728. The technical contents of Patent Document 1 will be briefly introduced below with reference to the reference numbers used in Patent Document 1.

  The reclining device of Patent Document 1 includes a base plate 1 and a gear plate 2 each having a substantially disk shape, and is configured as a “round reclining unit” by fitting both plates 1 and 2 facing each other. The base plate 1 is attached to the seat cushion side, and the gear plate 2 is attached to the seat back side. A housing space is secured between the plates 1 and 2 arranged opposite to each other, and locks such as two lock gears 5a and 5b, a central cam 6, two spiral springs 7 and a lever plate 8 are provided in the housing space. -A member for unlocking is incorporated.

  The gear plate 2 is provided with a plurality of internal teeth 21 inside the outer peripheral annular portion, and external teeth 51a and 51b that can mesh with the internal teeth 21 are provided on the outer ends of the lock gears 5a and 5b. It has been. The cam 6 disposed at the center of the base plate 1 engages with the inner ends of the lock gears 5a and 5b to control engagement and disengagement of the lock gear with respect to the inner teeth 21. The cam 6 is urged in a specific rotation direction by two spiral springs 7 disposed on both sides thereof, and each lock gear is directed radially outward by the rotation-biased cam 6 ( In other words, it is biased toward the direction of meshing with the internal teeth 21. By rotating the cam 6 together with the center shaft 9 connected to the cam 6 in a direction against the urging force of the spiral spring 7 (the direction opposite to the specific rotation direction), the external teeth 51a and 51b of the lock gears. Can be detached from the inner teeth 21 of the gear plate, and the seat back can be unlocked.

JP 2007-151728 A

  Thus, in the round unit type reclining device, the spring for rotating and energizing the cam in the direction in which the outer teeth of the lock gear mesh with the inner teeth of the gear plate is indispensable. However, the form of the spring for biasing the cam in a specific rotation direction is not necessarily limited to the spiral spring. For example, as shown in FIG. 12 (comparative example), it has been proposed by the present applicant to use an arc-shaped bar spring. That is, the cam biasing structure shown in FIGS. 12 (a), 12 (b), and 12 (c) is obtained by bending both end portions of the arc-shaped bar spring 108 at substantially right angles to form locking ends 181 and 182. 181 is inserted into the locking hole 162 provided in the cam, and the other locking end 182 is inserted into the locking hole 124 on the base plate side.

  In order to apply an urging force to the arc-shaped bar spring 108 of FIG. 12 so that the both locking ends 181 and 182 approach each other, the arc-shaped bar spring 108 has an arc shape rather than the distance between the two locking holes 162 and 124. It is necessary to set the distance between the locking ends 181 and 182 of the bar spring slightly short. Therefore, in order to insert the both locking ends 181 and 182 of the arc-shaped bar spring into the corresponding locking holes 162 and 124 when the arc-shaped bar spring 108 is attached, for example, the first locking end 181 is provided. After the posture to be inserted into the corresponding locking hole 162 is adjusted, the remaining second locking end 182 is forcibly shifted to the corresponding locking hole 124 against the spring elasticity, and the locking hole 124 is forced. (See FIG. 12 (c)). However, if there is not much dimensional difference between the thickness of the second locking end 182 (that is, the width of the end face of the locking end) and the inner diameter of the locking hole 124, the second locking end 182 Is difficult to insert into the locking hole 124, and the arc-shaped bar spring 108 cannot be assembled smoothly (degradation of assemblability).

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a reclining device with improved assembling performance of an arc-shaped bar spring for biasing a cam.

According to the first aspect of the present invention, a base plate and a gear plate that are combined so as to be relatively rotatable, a plurality of inner teeth provided inside an outer peripheral annular portion of the gear plate, and movable in the radial direction with respect to the base plate The lock gear is moved on the basis of the engagement relationship between the lock gear supported by the outer gear, the outer teeth of the lock gear that can be engaged with the inner teeth of the gear plate, and the inner end of the lock gear. A vehicle seat comprising: a cam rotatably provided for control; and a spring for rotating and biasing the cam in a rotation direction such that an outer tooth of the lock gear meshes with an inner tooth of the gear plate. In the reclining device for
The spring is an arc-shaped bar spring, and the arc-shaped bar spring has first and second locking ends formed by bending both ends thereof at a substantially right angle with respect to the spring main body. And
The first locking end is inserted into a first locking hole provided in the cam, and the second locking end is provided on a part of the base plate or a member supported by the base plate. By inserting into the second locking hole, the arc-shaped bar spring is attached to urge the cam to rotate,
At least one of the first and second locking ends of the arc-shaped bar spring is formed with a tapered portion inclined with respect to the axis of the locking end ,
The taper portion is provided on the back surface side of the locking end with respect to the biasing direction of the spring applied to the locking end on which the taper portion is formed .

(Delete)

  Note that “the back side of the latching end with respect to the biasing direction of the spring applied to the latching end” means, for example, that the direction of the biasing force applied to the arc-shaped bar spring is the first and second engagements. When the stop ends are in the direction of approaching each other, it means the side opposite to the side where the first and second locking ends face each other. For example, when the direction of the urging force applied to the arc-shaped bar spring is a direction in which the first and second locking ends move away from each other, the first and second locking ends face each other. Means side.

The invention of claim 2 is the reclining device according to claim 1, wherein the base plate has a fixed guide portion integrally formed on the base plate so as to movably support said lock gear in the radial direction, The second locking end of the arc-shaped bar spring is inserted into a second locking hole provided in the fixed guide portion of the base plate.

A third aspect of the present invention, in the reclining device according to claim 1, wherein the base plate has a fixed guide portion integrally formed on the base plate so as to movably support said lock gear in the radial direction, A substantially wedge-shaped movable guide piece is supported on the base plate so as to be interposed between the fixed guide portion and the lock gear, and the second locking end of the arc-shaped bar spring is formed by the movable guide piece. It is inserted in the 2nd locking hole provided in this.

  According to the reclining device of the first aspect, at least one of the first and second locking ends of the arc-shaped bar spring is formed with a tapered portion inclined with respect to the axis of the locking end. For this reason, even when the first and second locking ends of the bar spring are inserted into the corresponding first and second locking holes, respectively, so that the arc-shaped bar spring can express its urging force, The width of the end surface of the locking end formed with the tapered portion is relatively small with respect to the inner diameter of the locking hole corresponding to the locking end, and the insertion of the locking end with the tapered portion into the locking hole is extremely small. It becomes easy. Therefore, the arc-shaped bar spring can be assembled smoothly and reliably with respect to the cam and the base plate (or a member supported by the base plate).

Furthermore, according to the reclining device of the first aspect , the tapered portion is provided on the back side of the locking end with respect to the biasing direction of the spring applied to the locking end on which the taper portion is formed. For this reason, even when the locking end formed with the taper portion is inserted into the corresponding locking hole, it is the back surface of the locking end that is in contact with the inner wall surface of the locking hole. Since it is not the side (the side on which the tapered portion is formed) but the front side in the biasing direction of the spring at the locking end, a wider contact area between the locking hole and the locking end can be secured. . Therefore, it is possible to secure the locking of each locking end of the arc-shaped bar spring with respect to the locking hole.

According to the reclining device according to claim 2, the second locking end of the arcuate rod spring is inserted into the second engaging holes provided on the fixed guide portion of the base plate. For this reason, the arc-shaped bar spring having the fixed guide portion of the base plate as one of the scaffolds can surely urge the cam in the rotational direction such that the outer teeth of the lock gear mesh with the inner teeth of the gear plate. it can.

According to the reclining device of the third aspect , the second locking end of the arc-shaped bar spring is inserted into the second locking hole provided in the movable guide piece. For this reason, the cam is securely rotated in the rotation direction so that the outer teeth of the lock gear mesh with the inner teeth of the gear plate by the arc-shaped bar spring having the movable guide piece supported by the base plate as one scaffold. Can be energized. In addition, a substantially wedge-shaped movable guide piece can be urged inward (in the direction toward the center of the base plate) by an arc-shaped bar spring with the cam as the other scaffold, and the inwardly urged movable By the guide piece, the fixed guide portion, the movable guide piece, and the lock gear are brought into close contact with each other, and the occurrence of a gap between these members can be avoided to prevent the seat back from rattling in the front-rear tilt direction.

  Hereinafter, various embodiments of a reclining device for a vehicle seat according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the vehicle seat includes a seat cushion 11 as a seat portion and a seat back 12 as a backrest portion. The reclining device 10 supports the seat back 12 in a tiltable manner with respect to the seat cushion 11 and allows the seat back 12 to be switched between a locked state and an unlocked state based on an operation of the operation lever 13.

[First Embodiment]
2 to 7 show the reclining device of the first embodiment. As shown in FIGS. 2 to 5, the reclining device 10 includes a center shaft 1, a base plate 2, a gear plate 3, a plate connecting ring cover 4, a plurality of lock gears 5 (two in this example), a cam 6, and a link plate. 7 and a plurality of arc-shaped bar springs 8 (two in this example) and provided as an apparatus unit obtained by assembling these members (1 to 8).

  As shown in FIGS. 2 and 3, the base plate 2 is a disk-shaped member that constitutes the base of the reclining device 10, and is connected and fixed to the seat cushion 11 side of the vehicle seat in this embodiment. . The gear plate 3 is a generally disc-shaped member that is rotatably assembled to the base plate 2 and is connected and fixed to the seat back 12 side of the vehicle seat in this embodiment. The base plate 2 has an outer peripheral annular portion 21. The base plate 2 and the gear plate 3 are combined and connected so as to be relatively rotatable with the outer peripheral surface of the gear plate 3 in contact with the inner peripheral surface of the outer peripheral annular portion 21 of the base plate. The plate-connecting ring cover 4 is a covering material for the outer peripheral portion of the reclining device 10 and also functions as a connecting means for maintaining the combined connection state of the plates 2 and 3.

  As shown in FIG. 3, the base plate 2 is provided with two first fixed guide portions 22 and two second fixed guide portions 23 protruding from a position surrounding the center of the base plate 2. The first and second fixed guide portions 22 and 23 have different shapes and are adjacent to each other, but are functionally “paired”. That is, the lock gear 5 is arranged between each pair of fixed guide portions (22, 23), and each lock gear 5 is arranged in the radial direction of the base plate 2 by the first and second fixed guide portions 22, 23 sandwiched therebetween. It is supported movably.

  As shown in FIG. 3, the gear plate 3 has an outer peripheral annular portion 31 (in FIG. 3, the outer peripheral annular portion 31 has a cross-section, but is not intentionally hatched, and the same applies to FIGS. 4 and 5). A plurality of internal teeth 32 are continuously formed over the entire inner circumference of the annular portion 31 inside the outer circumferential portion 31.

  Each lock gear 5 is formed with a plurality of external teeth 52 that can mesh with the internal teeth 32 of the gear plate 3 at its outer end. Further, a control projection 53 is provided on one surface of each lock gear 5 (the surface facing the gear plate 3).

  Furthermore, in the link lining device 10 of this embodiment, the “operation cam for switching the arrangement of the two lock gears 5 at the same time by the cooperation of the center shaft 1, the cam 6, the link plate 7 and the two arc-shaped bar springs 8. "Mechanism".

  As shown in FIGS. 2 and 3, the cam 6 is disposed in the center region of the base plate 2, is integrated with the center shaft 1, and can be rotated synchronously with the shaft 1. The outer peripheral portion of the cam 6 is a cam portion that can be engaged with the inner end portion of the lock gear 5, and the radius of the lock gear 5 is determined based on the engagement relationship between the outer peripheral portion of the cam 6 and the inner end portion of the lock gear 5. Direction movement (as a result, engagement and release of the lock gear 5 with respect to the gear plate 3) is controlled. Further, the cam 6 is formed with a pair of convex portions 61 involved in the connection with the link plate 7 and two first locking holes 62 for locking one end of the arc-shaped bar spring 8. . On the other hand, a second locking hole 24 for locking the other end of the arc-shaped bar spring 8 is formed in each of the second fixed guide portions 23 provided in the base plate 2.

  The operation cam mechanism includes two arc-shaped bar springs 8 (see FIG. 5). As shown in FIGS. 6A and 6B, the arc-shaped bar spring 8 is a metal bar spring that is greatly curved in an arc shape close to a ring shape, and the bar spring 8 has both end portions thereof. It has a first locking end 81 and a second locking end 82 which are formed by being bent at a substantially right angle with respect to the spring body. The first locking end 81 is an end portion to be inserted into the first locking hole 62 provided in the cam 6. The second locking end 82 is an end portion to be inserted into the second locking hole 24 provided in the second fixed guide portion 23 of the base plate 2. The first and second locking ends 81 and 82 are inserted into the first and second locking holes 62 and 24, respectively, against the spring elasticity of the arc-shaped bar spring 8, so The bar spring 8 develops a biasing force and biases the cam 6 in a specific rotation direction. Each lock gear 5 is indirectly connected in the outward direction (that is, the direction in which the external teeth 52 of the lock gear mesh with the internal teeth 32 of the gear plate) via the cams 6 that are urged to rotate by the two arc-shaped bar springs 8. Is energized.

  In the present embodiment, as shown in the enlarged view of the main part of FIG. 6B, the second locking end 82 of the arc-shaped bar spring has a tapered portion inclined with respect to the central axis L of the locking end. 83 is formed. The tapered portion 83 is provided on the side opposite to the side where the first and second locking ends 81 and 82 face each other in the second locking end 82 where the tapered portion 83 is formed. As a result, the insertion distal end portion (lower end portion in the figure) of the second locking end 82 tends to taper, and the width w of the end face 84 at the insertion distal end portion is equal to the inner diameter d (FIG. 7 (FIG. It is clearly narrower than a).

  As shown in FIGS. 2, 4 and 5, the link plate 7 is formed as a plate material through which the center shaft 1 can be inserted in the center, and the two of the cams 6 are located near the center of the link plate 7. A fitting hole 71 is provided as two concave portions that can be fitted to the convex portion 61. The link plate 7 is attached to the cam 6 so as to be integrally rotatable based on the concave / convex fitting relationship between the two convex portions 61 and the two fitting holes 71. That is, the link plate 7 can be rotated synchronously with the cam 6 and the center shaft 1.

  Furthermore, two guide holes 72 corresponding to the control protrusions 53 of the two lock gears 5 are formed in the link plate 7. Each guide hole 72 has a substantially fan shape, and the control projection 53 of the lock gear 5 is inserted into each guide hole 72. The outer edge of each guide hole 72 is formed in an inclined shape or an S-shaped curve so that the position of each lock gear 5 can be controlled in accordance with the rotational phase of the link plate 7. That is, when the link plate 7 is in a predetermined rotational phase, each control projection 53 is allowed to be positioned on the outermost side in the radial direction of the link plate 7, and each lock gear 5 is a bar spring via the cam 6. 8, the external teeth 52 of the lock gear 5 are arranged at the “lock position” where the external teeth 52 of the lock gear 5 mesh with the internal teeth 32 of the gear plate 3. As the link plate 7 is rotated from the rotational phase at which the lock gear 5 is disposed at the lock position, the outer edge of each guide hole 72 guides each control projection 53 toward the radially inner side of the link plate 7, The lock gear 5 is pulled inward (that is, in a direction approaching the center of the link plate 7) against the indirect biasing action of the bar spring 8. As a result, each lock gear 5 is disposed at an “unlock position” where the outer teeth 52 do not mesh with the inner teeth 32 of the gear plate 3.

  As shown in FIG. 4, in the link plate 7, in addition to the fitting hole 71 and the guide hole 72, two viewing holes 73 and two viewing holes 74 are formed. The two peeping holes 73 located in the vicinity of the fitting hole 71 are small openings for exposing the two first locking holes 62 of the cam 6. The two peeping holes 74 located next to the guide holes 72 are large openings for exposing the second locking holes 24 of the two second fixed guide portions 23. Because of these peeping holes 73 and 74, the link plate 7 is disposed on the base plate 2, the lock gear 5 and the cam 6 (see FIG. 4), and then, as shown in FIG. Two arc-shaped bar springs 8 can be attached to the base plate 2 and the cam 6.

  An operation lever 13 is connected to the end of the center shaft 1 (see FIG. 2), and the occupant can control the operation of the operation cam mechanism based on the operation of the operation lever 13. That is, when the passenger operates the operation lever 13 in the unlocking direction, the center shaft 1, the cam 6 and the link plate 7 are integrally rotated in a predetermined direction, and the two lock gears 5 are simultaneously switched from the locked position to the unlocked position. . Then, the lock of the gear plate 3 with respect to the base plate 2 is released, and the angle of the seat back 12 can be adjusted. Thereafter, when the occupant releases his hand from the operation lever 13, each lock gear 5 is returned from the unlock position to the lock position by the biasing action of the bar spring 8 via the cam 6, and the gear plate 3 is locked with respect to the base plate 2. Is done. As the lock gear 5 returns, the center shaft 1, the cam 6 and the link plate 7 also return and rotate. Thus, the operation cam mechanism enables simultaneous switching of the two lock gears 5 between the lock position and the unlock position based on the operation of the operation lever 13 by the occupant.

  Next, a procedure for assembling the arc-shaped bar spring 8 will be described. First, the lock gear 5 and the cam 6 are attached to the base plate 2 before being combined with the gear plate 3 as shown in FIG. Subsequently, as shown in FIG. 4, the link plate 7 is arranged on the base plate 2, the lock gear 5 and the cam 6, and the two fitting holes 71 of the link plate 7 are fitted to the two convex portions 61 of the cam 6. Then, the link plate 7 is connected to the cam 6. And the 1st locking hole 62 and the 2nd locking hole 24 are exposed from the peeping holes 73 and 74 of the link plate 7, respectively. Thereafter, as shown in FIG. 5, the arc-shaped bar spring 8 is attached to the locking holes 62 and 24.

  FIGS. 7A and 7B show an outline of a method for assembling the arc-shaped bar spring 8. As shown in FIG. 7A, the distance between the first and second locking ends 81 and 82 of the arc-shaped bar spring 8 is the same as that of the first locking hole 62 of the cam 6 and the second fixed guide portion. 23 is set slightly shorter than the distance from the second locking hole 24. Further, the thickness of each locking end 81, 82 of the arc-shaped bar spring 8 and the inner diameter (d) of each locking hole 62, 24 are very similar, and the inner diameter ( d) is only slightly larger than the thickness of the locking ends 81, 82 of the arc-shaped bar spring 8.

  In order to assemble the arc-shaped bar spring 8 under such circumstances, first, the lower end surface of the first locking end 81 of the bar spring 8 is opposed to the upper end inlet of the first locking hole 62 of the cam 6 and is straightened as it is. Make it ready for insertion. In that case, since the lower end surface of the second locking end 82 of the bar spring 8 cannot be opposed to the upper end inlet of the second locking hole 24 of the fixed guide portion 23, The posture that can be inserted into the second locking hole 24 is adjusted while the second locking end 82 is shifted laterally so that the distance between the first and second locking ends 81 and 82 increases. At this time, since the tapered portion 83 is provided at the second locking end 82 as described above, the width w of the lower end surface 84 serving as the insertion tip of the second locking end 82 is set to the second locking hole 24. It is sufficiently narrow with respect to the inner diameter d. Therefore, it is possible to smoothly and reliably insert the second locking end 82 into the second locking hole 24. There is no doubt that at least the ease of insertion of the second locking end 82 into the second locking hole 24 is better than the comparative example of FIG.

  FIG. 7B shows a state in which the two locking ends 81 and 82 of the arc-shaped bar spring 8 are inserted into the corresponding locking holes 62 and 24, respectively. In this insertion completion state, a biasing force is applied to the arc-shaped bar spring 8 in a direction in which the two locking ends 81 and 82 are caused to approach each other. , It is urged to rotate in a direction that urges the lock gear 5 outward in the radial direction.

  Further, as described above, the tapered portion 83 is formed on the second locking end 82 on the side opposite to the side facing the first locking end 81, and the formation position thereof is the second locking end. This corresponds to the back side of the locking end 82 with respect to the biasing direction of the spring applied to 82. For this reason, when the insertion in FIG. 7B is completed, the inner wall surface of the second locking hole 24 comes into contact with the outer peripheral portion of the second locking end 82 on the side opposite to the side where the tapered portion 83 is present. It is a part of. Therefore, the contact area of the outer peripheral portion of the second locking end 82 with respect to the inner wall surface of the second locking hole 24 can be secured widely, and the locking of the second locking end 82 with respect to the second locking hole 24 is ensured. can do.

[Second Embodiment]
In the reclining device of the first embodiment, a delicate gap is inevitably generated between the lock gear 5 and the first and second fixed guide portions 22 and 23 that support the lock gear 5 on both sides. The back 12 may rattle in the direction of tilting back and forth. In order to eliminate such a problem, the second embodiment is obtained by adding a “movable guide piece” to the base plate 1. The basic configuration of the reclining device of the second embodiment is substantially the same as the device configuration of the first embodiment except for the movable guide piece. In the following, only points different from the first embodiment will be described in order to avoid duplication of explanation.

  FIGS. 8-10 shows the reclining apparatus of 2nd Embodiment. As shown in FIG. 8, a slidable movable guide piece 9 is interposed between each second fixed guide portion 23 of the base plate 2 and each corresponding lock gear 5. The movable guide piece 9 is formed in a substantially wedge shape whose width gradually decreases from the outer end portion toward the inner end portion. Further, the movable guide piece 9 is provided with a second locking hole 94 for inserting the second locking end 82 of the arc-shaped bar spring. In the second embodiment, the second fixed guide portion 23 does not have the second locking hole 24.

  In assembling the reclining device, first, as shown in FIG. 8, the lock gear 5, the cam 6, and the movable guide piece 9 are attached to the base plate 2 before being combined with the gear plate 3. Next, as shown in FIG. 9, the link plate 7 is arranged on the base plate 2, and the two fitting holes 71 of the link plate 7 are fitted to the two convex portions 61 of the cam 6, so The link plate 7 is connected. And the 1st locking hole 62 and the 2nd locking hole 94 are exposed from the peeping holes 73 and 74 of the link plate 7, respectively. Thereafter, as in the first embodiment, the first and second locking ends 81 and 82 of the arc-shaped bar spring 8 are connected to the first locking hole 62 of the cam 6 and the second locking hole 94 of the movable guide piece 9. Each of the arc-shaped bar springs 8 is mounted as shown in FIG.

  When the arc-shaped bar spring 8 is attached to the cam 6 and the movable guide piece 9, the bar spring 8 is based on a biasing action to make the first and second locking ends 81 and 82 approach each other. The cam 6 and the movable guide piece 9 are biased so as to draw each other. As a result, the following two urgings are simultaneously realized by each arc-shaped bar spring 8. That is, firstly, the cam 6 is rotationally biased in the direction in which the cam 6 biases the lock gear 5 outward in the radial direction by each arc-shaped bar spring 8 having the movable guide piece 9 as one scaffold. Is done. Also, secondarily, each movable guide piece 9 is urged inward (direction toward the center of the base plate 2) by each arc-shaped bar spring 8 having the cam 6 as the other scaffold.

  As a result of the inward biasing of the movable guide piece 9 by the arc-shaped bar spring 8, the movable guide piece 9 is always in a state of biting between the second fixed guide portion 23 and the lock gear 5. As a result, the three parts of the second fixed guide portion 23, the movable guide piece 9 and the lock gear 5 are in close contact with each other (tightly joined together), thereby avoiding the generation of a gap between these three parts, thereby preventing the seat back. 12 is prevented from rattling in the forward / backward tilt direction. Thus, in the second embodiment, the arc-shaped bar spring 8 has both a function of biasing the cam 6 and a function of biasing the movable guide piece 9 in the inward direction.

  [Modification] In the first and second embodiments described above, the tapered portion 83 is provided at the second locking end 82 of the arc-shaped bar spring 8, but the location where the tapered portion 83 is formed is not limited to this. For example, as shown in FIG. 11A, a tapered portion 83 may be provided for the first locking end 81 corresponding to the first locking hole 62 of the cam 6. Alternatively, as shown in FIG. 11B, tapered portions 83 may be provided on both the first locking end 81 and the second locking end 82. Also in these modified examples, in the locking end (81 or / and 82) where the tapered portion 83 is formed, the tapered portion is on the opposite side to the side where the first and second locking ends 81 and 82 face each other. It is preferable that 83 is provided.

  [Modification] In the first and second embodiments, the arc-shaped bar spring 8 is used as a spring that biases the first and second locking ends 81 and 82 toward each other (FIG. 7 ( b)). The present invention is not limited to this, and the arc-shaped bar spring 8 may be used as a spring that biases the first and second engaging ends 81 and 82 away from each other. In that case, in the locking end (81 or / and 82) where the taper portion 83 is formed, the taper portion 83 is provided on the side where the first and second locking ends 81 and 82 face each other. Is preferred.

The schematic side view when a vehicle seat is seen from the side. The radial direction sectional view of the reclining device of a 1st embodiment. Sectional drawing which shows the axis orthogonal cross section in the AA of FIG. Sectional drawing which shows the state which added the link plate to FIG. Sectional drawing which shows the state which added the circular arc-shaped bar spring to FIG. (A) is a front view of an arc-shaped bar spring, (b) is a side view of the arc-shaped bar spring and an enlarged view of the main part thereof. (A) And (b) is sectional drawing for description of the mounting method of an arc-shaped bar spring. Sectional drawing equivalent to the said FIG. 3 in the reclining apparatus of 2nd Embodiment. Sectional drawing which shows the state which added the link plate to FIG. Sectional drawing which shows the state which added the circular arc-shaped bar spring to FIG. (A) And (b) is a side view of the example of a change of an arc-shaped bar spring, and the enlarged view of the principal part. The comparative example which should be contrasted with this invention is shown, (a) is a front view of an arc-shaped bar spring, (b) is a side view of an arc-shaped bar spring, (c) is for explanation of the mounting procedure of the arc-shaped bar spring. Sectional drawing.

Explanation of symbols

2 ... base plate 3 ... gear plate 5 ... lock gear 6 ... cam 8 ... arc-shaped bar spring 9 ... movable guide piece (member supported by base plate)
DESCRIPTION OF SYMBOLS 10 ... Reclining device 22, 23 ... Fixed guide part 24 ... 2nd latching hole 31 in fixed guide part ... Outer peripheral ring part 32 of gear plate ... Inner tooth 52 of gear plate ... Outer tooth 62 of lock gear ... First engagement of cam Stop hole 81: first locking end 82 of the arc-shaped bar spring ... second locking end 83 of the arc-shaped bar spring ... taper portion 94 at the locking end ... second locking hole in the movable guide piece L ... engagement Center axis of toe

Claims (3)

A base plate and a gear plate which are combined so as to be relatively rotatable;
A plurality of internal teeth provided inside the outer peripheral annular portion of the gear plate;
A lock gear supported so as to be movable in the radial direction with respect to the base plate;
Outer teeth provided to be able to mesh with inner teeth of the gear plate at the outer end of the lock gear;
A cam rotatably provided to control the movement of the lock gear based on the engagement relationship with the inner end of the lock gear;
In a reclining device for a vehicle seat, comprising: a spring that rotationally biases the cam in a rotational direction such that an external tooth of the lock gear meshes with an internal tooth of the gear plate.
The spring is an arc-shaped bar spring, and the arc-shaped bar spring has first and second locking ends formed by bending both ends thereof at a substantially right angle with respect to the spring main body. And
The first locking end is inserted into a first locking hole provided in the cam, and the second locking end is provided on a part of the base plate or a member supported by the base plate. By inserting into the second locking hole, the arc-shaped bar spring is attached to urge the cam to rotate,
At least one of the first and second locking ends of the arc-shaped bar spring is formed with a tapered portion inclined with respect to the axis of the locking end ,
The reclining device , wherein the taper portion is provided on the back side of the engaging end with respect to a biasing direction of a spring applied to the engaging end on which the tapered portion is formed . The base plate has a fixed guide portion integrally formed with the base plate to support the lock gear so as to be movable in the radial direction;
The reclining device according to claim 1 , wherein the second locking end of the arc-shaped bar spring is inserted into a second locking hole provided in a fixed guide portion of the base plate. The base plate has a fixed guide portion integrally formed with the base plate to support the lock gear so as to be movable in the radial direction;
A substantially wedge-shaped movable guide piece is supported on the base plate so as to be interposed between the fixed guide portion and the lock gear,
The reclining device according to claim 1 , wherein the second locking end of the arc-shaped bar spring is inserted into a second locking hole provided in the movable guide piece.

Images