JP2005131145A - Reclining apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining apparatus where inclination angle can be adjusted without steps, play never occurs in the case of locking, a rolling member is surely engaged with a cam and a movable wheel, and operating feeling is good. <P>SOLUTION: A first cam 12 and a second cam 13 are coaxially fixed to a fixed wheel 10 with a pin 14. A pair of cylindrical rollers 16 are arranged in a space between the movable wheel 11 and the cams 12 and 13, and energized in a direction opposite to a wedge-shaped pressurizing member 17 arranged between the rollers 16. The pressurizing member 17 is energized in the direction of the rollers 16 by a spring 18. Consequently, the rollers 16 are engaged with the inner peripheral surface 111 of the movable wheel 11 and the cam surfaces 121 and 131 of the first and second cams 12 and 13 for locking. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reclining device that can arbitrarily adjust the inclination angle of a seat back of a vehicle seat, and more particularly to a reclining device that can adjust the inclination angle steplessly.

  Some conventional reclining devices can adjust the inclination angle of the seat back steplessly. As a mechanism for the stepless adjustment, there is a reclining device using a clutch mechanism using a wedge action between a roller and a circumferential surface. Patent Documents 1 to 3 disclose such a reclining device.

  In Patent Document 1, the inner plate 48 and the outer plate 50 are biased by the coil spring 68 in the opposite direction, so that the rollers 32 and 32a held in the concave portions provided in the inner plate 48 and the outer plate 50 are camped. 34 and the cover portion 24 of the case 22 are sandwiched and locked. (Part names and symbols correspond to Patent Document 1.)

  Further, in Patent Documents 2 and 3, a rolling member such as a ball or a roller is biased by a coil spring in a facing direction, and the rolling member is movable on the sliding surface of the fixing member on the seat cushion side and on the seat back side. The member is brought into pressure contact with the sliding surface of the member and locked by a wedge effect.

  Further, in Patent Documents 1 to 3, a sliding contact surface is obtained by moving a rolling member such as a ball or a roller against the bias of a coil spring by an unlocking member interlocked with or integrated with an operation lever. Is released and the lock is released.

Japanese Patent Publication No.42-9843 Japanese Utility Model Publication No. 49-27615 JP 2001-137061 A

  However, when the rolling member such as a roller is urged by a coil spring as described above, the rolling member is brought into contact with the respective sliding contact surfaces of the seat cushion side fixed member and the seat back side movable member. When they are brought into pressure contact with each other, there is a problem that a rust effect cannot be surely obtained due to the elasticity of the coil spring, and some backlash occurs.

  In addition, when a rolling member such as a roller is urged by a coil spring, in order to change the reclining device from the locked state to the unlocked state, in addition to the urging force of the coil spring, There is a problem that the feeling of operation may be poor because the force for pulling back is applied twice and a relatively large force is required.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to adjust the inclination angle steplessly, there is no backlash at the time of locking, and the rolling member is securely attached to the cam and the movable wheel. And a reclining device having a good operational feeling.

  In order to solve the above-described problems, the present invention is a reclining device that holds a seat back in a tiltable manner with respect to a seat cushion, and a clutch is provided on a tilting central axis of the seat back, and the seat back is supported by the clutch. In the reclining device that is fixedly or tiltably held, the clutch includes a fixed wheel provided on a seat cushion bracket fixed to the seat cushion, and a movable wheel that is rotatably supported by the fixed wheel and to which the seat back is fixed. And a cam that is supported by the fixed wheel and provided with a recess that opens outward in the radial direction, and a space formed by the cam surface of the cam and the inner peripheral surface of the movable wheel 1. A pair of rolling members and a cam recess are slidably disposed, interposed between the rolling members and tapered at the tip. A wedge-shaped pressing member, a spring member that constantly urges the pressing member in a direction of pressing the rolling member, and the pressing member against the urging force of the spring member. Releasing means for releasing from the pressing, and the pressing member presses the rolling member toward the cam surface of the cam and the inner peripheral surface of the movable wheel by the biasing force of the spring member, A technical feature is that the rolling member regulates the rotation of the movable wheel by pressing and engaging the cam surface of the cam and the inner peripheral surface of the movable wheel.

  In the present invention, preferably, a plurality of grooves in which the pressing member provided in the cam is disposed are provided at equal intervals along a circumferential surface, and the pressing member and the rolling member are provided respectively to the grooves. And the spring member can be arranged.

  Further, in the present invention, preferably, the rolling member is provided with a protrusion extending in the longitudinal direction, and the same protrusion as the rolling member extending in the longitudinal direction is provided on the inner circumferential surface of the movable wheel. be able to.

  In the present invention, it is preferable that the release means is an operation lever that operates the clutch, a release plate that is connected by the operation lever and the operation shaft, and is engaged by the pressing member and the engagement means, The cam is supported on the fixed ring, and includes a pin having an overhang portion, and a rotating plate that is rotatably disposed on the overhang portion of the pin and has an engagement portion that engages with the pressing member, By rotating the operation lever, the release plate is rotated, and the pressing member is moved radially inward along the groove of the cam to release the pressing member from being pressed. Engagement of the rolling member with the movable wheel can also be released by the pressing member engaging with the protrusion of the rotating plate and thereby rotating the rotating plate.

  Furthermore, in the present invention, preferably, when the pressing member is slid radially inward along the groove of the cam, the release plate is disposed on both sides sandwiching the pressing member, and the pressing member Can be moved simultaneously from both sides.

  In the present invention, preferably, the pressing member is provided with an engaging portion that engages with the release plate, and the substantially U-shaped engaging hole that engages with the engaging portion is provided in the pressing member. It can be provided on the release plate to serve as the engaging means.

  Further, in the present invention, preferably, the projecting portion of the pin is formed at a substantially central portion, one side of the pin is fixed to the stationary ring through the first cam, and the other side of the pin is Fixed to the second cam, the first cam and the second cam have the same shape, are mounted in parallel with the protruding portion of the pin interposed therebetween, and are rotatably disposed on the protruding portion of the pin. Further, the rolling plate is sandwiched, the rolling member rolls on the two outer peripheral surfaces of the first cam and the second cam, and the pressing member is the first cam and the second cam. It is possible to slide simultaneously on the operating grooves provided in the cams.

  In the first aspect of the invention, the wedge-shaped pressing member is disposed between the pair of rolling members, so that when the rolling member meshes with the cam surface of the cam and the inner peripheral surface of the movable wheel, the coil spring Since there is no elasticity like this, there is an effect that the play at the time of locking can be eliminated. And since it is a clutch-type reclining apparatus by meshing | engagement of a rolling member, the inclination-angle of a seat back can be adjusted in a stepless manner.

  In the second aspect of the invention, the rolling member is engaged with the cam surface of the cam and the inner peripheral surface of the movable wheel in order to fix the seat back, and the mechanism is arranged on the circumferential surface of the cam. Since a plurality of the seat backs are provided at equal intervals along the seat back, the seat back can be fixed more securely and firmly.

  In the third aspect of the invention, when the rolling member meshes with the inner peripheral surface of the movable wheel, the protrusion extending in the longitudinal direction provided on the rolling member and the longitudinal length provided on the inner peripheral circumferential surface of the movable wheel. The protrusions extending in the direction engage with each other, and the meshing is held and locked more reliably.

  In the fourth aspect of the invention, the rolling member is attached when an operation for releasing the rolling member from the meshing state of the cam surface of the cam and the inner peripheral surface of the movable wheel (operation for releasing the fixation of the seat back) is performed. Although there is a force to push back the spring to push down the urging pressing member, little force is required to release the rolling member from the meshing state after the pressing member is released and no urging force is applied. Therefore, unlike the prior art, since no force is applied twice, only a small force is required, the operation feeling is good, and the operation for releasing the lock becomes easy.

  Furthermore, in the fifth aspect, the pressing member can be slid simultaneously from both sides, and it is possible to apply an even force to the pressing member. There is an effect that the force can be released and the feeling of operation is good.

  And in the said 6th invention, the engagement part engaged with an engagement hole protrudes along the substantially U-shaped engagement hole provided in the cancellation | release plate by rotating a cancellation | release plate. Since the pressing member gradually moves downward, the operation is smoother and the operation feeling is better than when the pressing member is pushed down directly.

  In the seventh aspect of the invention, two cams are arranged coaxially, and there is provided a rotating plate that releases the rolling member from meshing with the cam surface of the cam and the inner peripheral surface of the movable wheel. When the rolling member is pushed out, the rotating plate is positioned substantially at the center of the rolling member, so that the rolling member can be easily released from meshing.

  A reclining device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing an automobile seat. A seat back 2 is held by a reclining device 3 so as to be able to tilt on the seat cushion 1. That is, the seat cushion bracket 5 is fixed to the seat cushion 1 via the base 4. The seat back 2 is held by a seat back bracket 6. As will be described later, a fixed ring 10 that is a part of the reclining device 3 is integrally formed on the seat cushion bracket 5, and a first cam 12 and a second cam 13 are fixed to the fixed ring 10. Yes. A movable wheel 11 is fixed to the seat back bracket 6. The movable wheel 11 is assembled in a hinge structure so that it can rotate around the fixed wheel 10.

  An operation shaft 8 is provided at the center of the fixed wheel 10, the first cam 12, the second cam 13, and the movable wheel 11, and the operation lever 7 is fixed to the operation shaft 8. When the occupant pulls up the operation lever 7, the reclining device 3 is unlocked, and the inclination of the seat back 2 can be freely adjusted.

  FIG. 2 is a plan view of only the reclining device as seen from above. A reclining device 3, 3 ′ that is symmetrical to the left and right is disposed, and has a double-sided structure that supports the left and right of the seat back 2. The left and right operation shafts 8, 8 ′ are connected by a connection pipe 9, and are locked and unlocked simultaneously by the operation of the operation lever 7. The left and right members are formed in a shape that is symmetrical with respect to the left and right. As described above, a reclining device with a double-sided structure can be used to make a reclining device with higher rigidity, but of course, the cost can be reduced as a cantilevered reclining device.

  3, 4, and 5 are exploded perspective views showing components constituting the reclining device 3. In FIG. 3, the components are sequentially shown in FIG. 3, the operation shaft 8 that is rotated by engaging the chamfer 82 with the elongated hole 73 of the operation lever 7, the seat cushion bracket 5 that is fixed to the seat cushion 1, A fixed wheel 10 formed on the seat cushion bracket 5 and provided with a sliding contact surface 101 is shown. The fixed ring 10 is provided with a center hole 103 in which the large-diameter portion 81 of the operation shaft 8 is fitted and plays a role of rotatably supporting the operation shaft 8.

  4, the six fixing holes 102 provided in the fixed ring 10 shown in FIG. 3 are inserted into the six insertion holes 122 by the first fixing portions 141 of the six pins 14 respectively. Thus, the first cam 12 to be fixed is shown, and six pairs (12 pieces) of rotating plates 15, 15 that are rotatably disposed on an overhanging portion 142 provided at a substantially central portion of the pin 14. The second cam 13 is fixed by inserting the second fixing portion 143 located on the opposite side of the first fixing portion 141 with the protruding portion 142 of the pin 14 being inserted through the six insertion holes 132. Is shown.

  Furthermore, 6 pairs (12 pieces) of cylindrical rollers 16, 16 disposed as rolling members between the first cam 12, the second cam 13, and the movable wheel 11, and the rollers 16, 16 when locked. 6 wedge-shaped pressing members 17 for urging the urging force, six springs 18 for urging the pressing member 17 radially outward, and a first engagement portion 171 protruding from the urging member 17, A first release plate 19 that pushes the pressing member 17 inward in the radial direction is shown.

  The first cam 12 and the second cam 13 have the same shape, and when the reclining device 3 is in the locked state, the first cam cam surface 121 and the first cam surface 121 mesh with each other. The cam surfaces 131 of the two cams are disposed between the rollers 16 and 16, and the pressing members 17 that urge the rollers 16 and 16 slide, respectively. Two cam operating grooves 133 are provided.

  The central hole 124 of the first cam 12 and the central hole 135 of the second cam 13 are inserted into the large-diameter portion 81 of the operation shaft 8 in the same manner as the center hole 103 of the fixed ring 10, so that the operation shaft 8 It plays the role of supporting the rotation freely.

  The pressing member 17 is provided with a first engaging portion 171 and a second engaging portion 172 projecting from the first engaging portion 171 when the reclining device 3 is unlocked. The second engagement portion 172 is formed in the operation lever 7 through the six insertion holes 104 of the fixed ring 10 with reference to FIG. 3. The release plate 71 engages with the six engagement holes 72. Further, the pressing member 17 is provided with a connecting hole 173 connected to the spring 18, and the spring 18 connects the connecting hole 134 of the second cam 13 and the connecting hole 173 of the pressing member to be attached. Thus, the pressing member 17 is urged to press the rollers 16 and 16. At this time, the spring 18 is provided for the pressing member 17 to press the rollers 16, 16, and particularly its shape and mounting position (for example, the bottom of the pressing member 17 and the first and second cams 12, The position between the 13 operation grooves 123 and 133 is not limited to this.

  The surface of the cylindrical roller 16 that is in contact with the cam surface 121 of the first cam, the cam surface 131 of the second cam, or the inner peripheral surface 111 of the movable wheel 11 described later has no irregularities in this embodiment. The reclining device 3 can be provided by providing unevenness extending in the axial direction and providing similar unevenness on the cam surface 121 of the first cam, the cam surface 131 of the second cam, or the inner peripheral surface 111 of the movable wheel 11 described later. Is locked (the state in which the rollers 16 and 16 are engaged with the two cam surfaces 121 and 131 and the inner peripheral surface 111 described above), the concavo-convex portions further bite into each other so that they are locked more firmly. Further, in the present invention, a cylindrical roller is used and the reclining device 3 is locked, but the same effect can be obtained even if a ball is used as the same rolling member.

  FIG. 5 shows a movable wheel 11 having an inner peripheral surface 111, a cover 20 that covers the movable wheel 11, and a seat back bracket 6 that fixes the seat back 2. The elements shown in FIGS. 3 to 5 constitute a clutch.

  The movable wheel 11 is a bottomed cylindrical part, and the inner peripheral surface 111 forms a part of a hinge structure that fits into the sliding contact surface 101 of the fixed wheel 10 to support the rotation of the movable wheel 11 and is cylindrical. The rollers 16 and 16 are slidably engaged with each other. A central hole 112 is formed in the center of the movable wheel 11. The central hole 112 is a portion through which the serration portion 83 of the operation shaft 8 shown in FIG. 3 is inserted. Five circular protrusions 113 are formed on the same circumference on the bottom of the movable wheel 11. These circular protrusions 113 fit into the five round holes 61 of the seat back bracket 6 shown in FIG. 5 and play a role of fixing the movable wheel 11 to the seat back bracket 6.

  FIG. 6 is a front view of the reclining device 3 as seen from the side opposite to the operation lever 7 with a part thereof broken. A seat cushion bracket 5 fixed to the seat cushion 1 (not shown) has a fixed ring 10 (not shown in the figure), and an operation shaft 8 is rotatably supported at the center of the fixed ring 10. An operation lever 7 is fixed to the operation shaft 8 (see FIG. 3). 3 and 4, the chamfered portion 84 at the center of the operation shaft 8 is inserted into the elongated hole 192 of the first release plate 19 and fixed so as to rotate integrally. At this time, the engagement hole 191 of the first release plate 19 and the engagement hole 72 of the second release plate 71 formed in the operation lever 7 are connected to the first engagement portion 171 of the pressing member 17 and the first engagement portion 171. The two engaging portions 172 are engaged with each other.

  A tension spring 51 is stretched between the operation lever 7 and the seat cushion bracket 5, and the operation lever 7 is rotated counterclockwise, that is, the operation shaft 8 that rotates integrally with the operation lever 7, the first and second shafts. The release plates 19 and 71 are urged counterclockwise. Referring also to FIG. 6, the pair of cylindrical rollers 16, 16 are located in a space between the first and second cams 12, 13 fixed to the fixed wheel 10 by the pin 14 and the movable wheel 11. The pressing members 17 arranged and disposed in the operation grooves 123 and 133 of the first and second cams 12 and 13 are urged in opposite directions. The pressing member 17 is biased in the direction of the rollers 16 and 16 by connecting the connecting hole 134 of the second cam 13 and the connecting hole 173 of the pressing member 17 by the spring 18.

  FIG. 7 is a longitudinal sectional view taken along line AA of FIG. As a part not illustrated in FIG. 6, there is a connection pipe 9 that connects the left and right operation shafts 8.

  A method of assembling the reclining device 3 will be briefly described with reference to FIGS. 7 and 3 to 5. First, the large-diameter portion 81 of the operation shaft 8 is inserted into the center hole 103 of the fixed ring 10 formed integrally with the seat cushion bracket 5 and is rotatably supported. The center hole 124 of the first cam 12 is fitted into the large-diameter portion 81 of the operation shaft 8, the first fixing portion 141 of the pin 14 is inserted into the insertion hole 122 of the first cam 12, and the fixed wheel The first cam 12 is also fixed to the fixed ring 10 by caulking.

  Next, the curved portions 152 of the rotary plates 15 and 15 are rotatably fitted to the overhang portions 142 of the six pins 14. The second cam 13 is incorporated so as to sandwich the six pairs of rotating plates 15 and 15. At this time, the large-diameter portion 81 of the operating shaft 8 is inserted into the center hole 135 of the second cam 13, and the second fixing portion 143 of the pin 14 is inserted into the six insertion holes 132 and fixed by caulking. The

  Next, the pressing member 17 is slidably incorporated into the operation grooves 123 and 133 of the first and second cams 12 and 13, and the second engaging portion 172 is inserted into the insertion hole 104 of the fixed ring 10. insert. Then, the connecting hole 173 of the pressing member 17 and the connecting hole 134 of the second cam 13 are connected by the spring 18, and the pressing member 17 is urged to be pushed outward in the radial direction. Cylindrical rollers 16 and 16 are arranged between the pressing member 17 and the rotating plates 15 and 15 so as to be able to roll. Then, the first release plate 19 is assembled so that the long hole 192 fits into the chamfer 84 at the center of the operation shaft 8. The built-in first release plate 19 fixes the first release plate 19 to the operation shaft 8 by caulking the step portion of the operation shaft 8. At this time, the engagement hole 191 of the first release plate 19 is engaged with the first engagement portion 171 of the pressing member 17.

  Next, the inner peripheral surface 111 of the movable wheel 11 is fitted into the sliding contact surface 101 of the fixed wheel 10, and the movable wheel 11 is rotatably incorporated into the fixed wheel 10. Then, the cover 20 is put on the outside, and the periphery of the cover 20 is fixed to the seat cushion bracket 5 by welding. The cover 20 and the movable wheel 11 are loosely fitted and are rotatable with respect to each other. This prevents the movable wheel 11 from falling off to the left side in the axial direction drawing. Then, the circular hole 61 of the seat back bracket 6 that holds the seat back 2 is fitted into the five circular protrusions 113 of the movable wheel 11 so that the seat back bracket 6 and the movable wheel 11 are fixed and integrated.

Further, a long hole 73 of the operation lever 7 is fitted into the chamfered portion 82 at the right end of the operation shaft 8, and the operation lever 7 is fixed to the operation shaft 8 by caulking near the right end of the operation shaft 8. At this time, the engagement hole 72 of the second release plate 71 formed in the operation lever 7 is engaged with the second engagement portion 172 of the pressing member inserted into the insertion hole 104 of the fixed ring 10.
Finally, the connection pipe 9 is fitted into the serration portion 83 at the left end of the operation shaft 8 to be connected to the operation shaft of the reclining device on the opposite side.

  As described above, the parts fixed together with the seat cushion bracket 5 are the fixed wheel 10, the pin 14, the first and second cams 12 and 13, and the cover 20. The second release plate 71, the operation shaft 8, and the first release plate 19 rotate together with the operation lever 7. It is the movable wheel 11 that swings together with the seat back bracket 6.

  Based on the above configuration, the operation will be described. FIG. 8 is a cutaway view showing the vicinity of a pair of rollers for explaining the operation, in which (a) shows a state where the reclining device 3 is locked, and (b) shows that the reclining device 3 is unlocked. It shows the state being done. The cylindrical rollers 16 and 16 are disposed in a space surrounded by the movable wheel 11 and the first and second cams 12 and 13, and a pressing member 17 is disposed between them. The rollers 16 and 16 are urged by a spring 18 in a direction for separating the rollers 16 from each other. The movable wheel 11 is disposed in sliding contact with the rollers 16 and 16. The rollers 16 and 16 are pushed out and pressed against the inner peripheral surface 111 of the movable wheel 11 by the pressing member 17 in opposite directions.

  In this state, when some force is applied to the seat back 2 and the movable wheel 11 tries to rotate counterclockwise, the roller 16 also tries to rotate counterclockwise due to the frictional force. However, the space between the cam surfaces 121 and 131 of the first and second cams 12 and 13 and the inner peripheral surface 111 of the movable wheel 11 is narrower in the direction in which the rollers 16 are to rotate. For this reason, the roller 16 is strongly pressed and meshed with the cam surfaces 121 and 131 of the first and second cams 12 and 13 and the inner peripheral surface 111 of the movable wheel 11 by the pressing member 17. For this reason, the movable wheel 11 is locked and cannot rotate. This is because the movable wheel 11 is locked for the same reason when the movable wheel 11 is rotated clockwise.

  In this way, the cylindrical rollers 16, 16 always have the inner peripheral surface 111 of the movable wheel 11 and the cam surfaces 121 of the first and second cams 12, 13 regardless of the rotation direction of the movable wheel 11. , 131 are pressed against each other by the pressing member 17 and engaged and locked, so that the reclining device 3 is securely locked without play.

  To release the lock, the occupant pulls up the operation lever 7 shown in FIG. 6 against the urging force of the tension spring 51. Then, not only the second release plate 71 formed on the operation lever 7 but also the operation shaft 8 to which the operation lever 7 is fixed rotates in the clockwise direction, and the first release plate 19 that is fixed to the operation shaft 8. Rotates clockwise. Referring also to FIG. 8B, when the first release plate 19 and the second release plate 71 are rotated, the first and second engaging portions 171 and 172 of the pressing member 17 are engaged with each other. The engagement holes 191 and 72 are rotated, thereby pushing the pressing member 17 down from both sides simultaneously.

  Then, the pressing member 17 is lowered along the operation grooves 123 and 133 of the first and second cams 12 and 13 and engaged with the protrusions 151 of the rotary plates 15 and 15. As a result, the rotating plates 15 and 15 rotate around the projecting portion 142 of the pin 14, and the leading ends of the rotating plates 15 and 15 come into contact with the rollers 16 and 16, so The engagement between the surface 111 and the cam surfaces 121 and 131 of the first and second cams 12 and 13 is released, and the surface is pushed back to the pressing member 17 side. As a result, the movable wheel 11 is free from the rollers 16 and 16 and can rotate. That is, the lock is released and the inclination of the seat back 2 connected to the movable wheel 11 can be freely adjusted.

  In this way, the urging force of the pressing member 17 is released by the first release plate 19 and the second release plate 71, and the rollers 16 and 16 are connected to the inner peripheral surface 111 of the movable wheel 11 and the first and first release plates. The release from the meshing with the cam surfaces 121 and 131 of the second cams 12 and 13 is performed by the rotating plates 15 and 15, so that the force for releasing both does not apply double, and the operational feeling is improved. Can do.

  In order to lock the reclining device 3 again after the adjustment of the inclination of the seat back 2 is completed, the hand may be released from the operation lever 7. The second release plate 71, the rotary shaft 8 and the first release plate 19 formed on the operation lever 7 are rotated counterclockwise by the urging force of the tension spring 51, and the pressing member 17 is returned to the second release plate. The first and second engaging portions 171 and 172 can return upward along the engaging holes 72 and 191 of the first release plate 19 and the connecting hole 173 of the pressing member 17. The pressing member 17 is pushed back upward by the urging force of the spring 18 connected to the connecting hole 134 of the second cam 13.

  Then, the cylindrical rollers 16, 16 are pushed in opposite directions by the pressing member 17, while pushing back the rotating plates 15, 15, the inner peripheral surface 111 of the movable wheel 11 and the first and second cams 12, 13. The cam surfaces 121 and 131 are engaged and locked. That is, the reclining device 3 is locked. Therefore, in the present invention, when the rollers 16 and 16 are meshed and locked, they are pressed by the pressing member 17 instead of the conventional elastic member such as a coil spring, so that there is no backlash caused by elasticity like the elastic member. It is surely locked.

  When the pressing member 17 moves upward, the rotating plates 15 and 15 are disengaged from the projecting portion 151, so that they are pushed back by the rollers 16 and 16 and rotate around the protruding portion 142 of the pin 14.

  In the embodiment described above, the second release plate 71 is formed on the operation lever 7 and the fixed ring 10 is integrally formed on the seat cushion bracket 5, but each is formed as a separate member, and one member is formed. The second release plate 71 may be fixed to the operation lever 7 and the fixed ring 10 may be fixed to the seat cushion bracket 5 by providing a protrusion on the other member and fixing it with a mounting hole provided on the other member. .

  In the above embodiment, the second release plate 71 and the first release plate 19 are provided with the engagement holes 72 and 191 respectively, and the first and second engagement portions 171 and 172 of the pressing member 17 are By engaging, the second release plate 71 and the first release plate 19 rotate to push down the pressing member 17, but on the contrary, the second release plate 71 and the first release plate 19. An engaging portion may be provided so as to project, and an engaging hole that engages with the engaging portion may be provided in the pressing member 17 so that the pressing member 17 can be operated. In addition, it is not always necessary to provide release plates at both ends of the pressing member 17, and there is no problem in operation even if only one side is provided.

  Furthermore, in the present embodiment, two cams are used. Needless to say, the same effect as in the present embodiment can be obtained with a single cam if the cam thickness is increased.

It is a side view which shows the sheet | seat for motor vehicles. It is the top view which looked at only the reclining apparatus from the top. It is a disassembled perspective view which shows the components which comprise a reclining apparatus. It is a disassembled perspective view which shows the components which comprise a reclining apparatus. It is a disassembled perspective view which shows the components which comprise a reclining apparatus. FIG. 7 is a front view showing the reclining device in a partially broken view when viewed from the opposite side of the operation lever. It is an AA line longitudinal cross-sectional view of FIG. 6 which shows a reclining apparatus. It is a broken view which shows a pair of roller vicinity for demonstrating operation | movement, Comprising: (a) is a broken view which shows the state in which the reclining apparatus 3 is locked, (b) is the lock | rock of the reclining apparatus 3 released. FIG.

Explanation of symbols

Reference Signs List 1 seat cushion 2 seat back 3 reclining device 7 operating lever 8 operating shaft 10 fixed wheel 11 movable wheel 12 first cam 13 second cam 14 pin 15 rotating plate 16 roller 17 pressing member 19 first release plate 71 second Release plate 72 Engagement hole 101 Sliding contact surface 111 of fixed wheel Inner peripheral surface 121 of movable wheel First cam cam surface 131 Second cam cam surface 142 Overhang portion 191 Engagement hole

Claims (7)

A reclining device that tiltably holds a seat back relative to a seat cushion,
In a reclining device in which a clutch is provided on the tilt center axis of the seat back, and the seat back is fixed or tiltable by the clutch.
The clutch includes a fixed wheel provided on a seat cushion bracket fixed to the seat cushion;
A movable wheel that is rotatably supported by the fixed wheel and to which the seat back is fixed;
A cam supported by the fixed ring and provided with a recess that opens outward in the radial direction;
A pair of rolling members disposed in a space formed by the cam surface of the cam and the inner peripheral surface of the movable wheel;
A wedge-shaped pressing member that is slidably disposed in the recess of the cam, is interposed between the rolling members, and has a taper at the tip;
A spring member that constantly urges the pressing member in a direction of pressing the rolling member;
A release means for releasing the pressing member from the pressing of the rolling member against the biasing force of the spring member;
The urging force of the spring member causes the pressing member to press the rolling member toward the cam surface of the cam and the inner peripheral surface of the movable wheel, so that the rolling member and the cam surface of the cam are movable. A reclining device characterized in that rotation of the movable wheel is restricted by being brought into pressure contact with and engaged with an inner peripheral surface of the wheel.   A plurality of grooves provided in the cam in which the pressing member is disposed are provided at equal intervals along the circumferential surface, and the pressing member, the rolling member, and the spring member are disposed in each of the grooves. The reclining device according to claim 1. Providing the rolling member with a protrusion extending in the longitudinal direction,
The reclining device according to claim 1, wherein a protrusion similar to a rolling member extending in a longitudinal direction is provided on an inner circumferential surface of the movable wheel. An operating lever for operating the clutch;
A release plate connected by the operating lever and the operating shaft and engaged by the pressing member and the engaging means;
A pin for supporting the cam on the fixed ring and having an overhang;
A rotating plate that is rotatably disposed on the protruding portion of the pin and has an engaging portion that engages with the pressing member;
By rotating the operation lever, the release plate is rotated, and the pressing member is moved radially inward along the groove of the cam in order to release the pressing member from being pressed by the rolling member. 2. The engagement of the rolling member with the movable wheel is also released by the pressing member engaging with the protrusion of the rotating plate and thereby rotating the rotating plate. 4. A reclining device according to 3.   When the pressing member is slid radially inward along the groove of the cam, the release plate is disposed on both sides sandwiching the pressing member, and the pressing member is simultaneously moved from both sides. The reclining device according to claim 4.   The press member is provided with an engagement portion that engages with the release plate, and an engagement hole that engages with the engagement portion is provided in the release plate as an engagement means. The reclining device according to 4 to 5. The overhang portion of the pin is formed in a substantially central portion,
One side of the pin is fixed to the stationary wheel through a first cam;
The other side of the pin is fixed to a second cam;
The first cam and the second cam have the same shape, are mounted in parallel with the protruding portion of the pin interposed therebetween, and sandwich the rotating plate rotatably disposed on the protruding portion of the pin. The rolling member rolls on the two outer peripheral surfaces of the first cam and the second cam, and the wedge member is provided on the first cam and the second cam. The reclining device according to any one of claims 1 to 6, wherein the groove slides simultaneously.

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