JP2010000900A - Coupling device for vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the damage of constituent teeth of lock members for rotational locking by engagement in a coupling device in which two object members are coupled relatively rotatably with each other as done in a reclining device. <P>SOLUTION: Respective poles 30, 30 constituting the lock members of the reclining device 4 make outer peripheral teeth faces 30a, 30a engage with an inner peripheral teeth faces 12a of a rachet 10 in a state supported in the circumference direction by a guide 20 and lock relative rotation thereof. Ride-over parts 12b, 12b protruded above the inner peripheral teeth face 12a are formed in the rachet 10. By positioning at a destination position of engaging movement of the poles 30, 30, the ride-over parts 12b, 12b make the respective poles 30, 30 ride over them and prevent the engaging movement. End teeth a1, a1 that are formed at ends in the circumference direction out of outer peripheral teeth faces 30a, 30a of the respective poles 30, 30 have a same tooth shape with those of teeth a2, a2 of the second from the ends, however radii of curves of their tips are larger. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a connecting device for a vehicle seat. Specifically, the present invention relates to a vehicle seat coupling device that couples two target members such that they can rotate relative to each other.

  2. Description of the Related Art Conventionally, in a vehicle seat, a seat back is connected to a seat cushion via a reclining device, and an operation for adjusting a backrest angle is known. Here, the following Patent Document 1 discloses the configuration of the reclining device described above. In this disclosure, the reclining device is configured such that a disc-shaped ratchet integrally connected to the skeleton portion of the seat back and a disc-shaped guide integrally connected to the skeleton portion of the seat cushion can rotate relative to each other. It is assembled in the axial direction so as to support each other.

  Between the ratchet and the guide, a pole that can lock the relative rotation by meshing is disposed. This pole is guided so as to be movable only inward and outward in the radial direction with respect to the guide, and by engaging the outer peripheral tooth surface with the inner peripheral tooth surface of the cylindrical portion of the ratchet, the ratchet and guide are The relative rotation between them is locked.

By the way, on the inner peripheral surface of the cylindrical portion of the ratchet described above, a protruding riding portion without internal teeth is formed in a part of the circumferential direction. The riding-up portion is formed so as to protrude inward in the radial direction from the inner peripheral tooth surface, and when the pole rides on the riding-up portion, meshing of the pole is prevented. The rotation angle region where the pole rides on this riding part is set as a free zone where the reclining device is not returned to the locked state, for example, it is set as a forward tilt rotation region where the seat back is not used backrest Thus, the seat back can be moved forward and raised easily.
JP 2002-177083 A

  However, in the prior art disclosed above, for example, the seat back is lifted vigorously by a spring force from the position where the seat back is tilted, and the reclining device enters the free zone while entering the free zone with rotational motion. If it is to be returned, the constituent teeth on the end side of the pole may interfere with the end surface of the riding section with a strong momentum and cause damage to the teeth.

  The present invention has been devised to solve the above-described problems, and the problem to be solved by the present invention is to connect two target members such that they can rotate relative to each other like a reclining device for a vehicle seat. In the connecting device, the component teeth of the lock member that performs rotation lock by meshing are prevented from being damaged.

In order to solve the above-mentioned problems, the vehicle seat coupling device of the present invention takes the following means.
First, a first invention is a vehicle seat coupling device that couples two target members such that they can rotate relative to each other, and includes two coupling members and a locking member. The two connecting members are integrally connected to one side or the other side of the two target members, respectively, and have disk-shaped portions that are assembled in the board-aligning direction so as to be relatively rotatable with each other. The locking member is disposed between the two connecting members, and is assembled to the connecting member on one side and supported in the circumferential direction, and the inner peripheral tooth formed on the connecting member on the other side. By engaging the outer peripheral tooth surface with the surface, the relative rotation between the two connecting members is locked. The connecting member on the other side is formed with a riding portion that protrudes radially inward from the inner peripheral tooth surface. The ride-on portion is located at a position where the lock member is engaged and moved, thereby causing the lock member to ride and preventing the engagement movement. The first component tooth formed at the circumferential end constituting the outer peripheral tooth surface of the lock member has the same tooth shape as the second adjacent second component tooth from the end. The radius of the curve that draws is larger.

  According to the first aspect of the invention, when the locking member meshes with the relative rotation of the two connecting members, the first component teeth formed at the circumferential end of the locking member are arranged in the circumferential direction of the riding portion. It may collide with the end face part and receive a strong load. However, since the first component tooth has a larger radius of the curve that draws the tip than the adjacent second component tooth and the load strength is increased, It is difficult to be crushed or broken. Thus, damage to the constituent teeth of the lock member can be prevented by a simple structure in which the radius of the tip of the first constituent teeth is increased.

  Next, according to a second aspect, in the first aspect described above, the inner peripheral tooth surface formed on the coupling member on the other side is curved and formed into a perfect circle like the inner peripheral tooth surface of the internal gear. Has been. The outer peripheral tooth surface of the lock member is formed to be curved in a circular arc shape so as to be able to mesh with the inner peripheral tooth surface. The first component teeth on the outer peripheral tooth surface are formed in a smaller tooth profile than the second component teeth.

  According to the second aspect of the invention, since the first component teeth are formed in a smaller tooth profile than the second component teeth, the outer peripheral tooth surface of the lock member is curved in a perfect circle shape of the other connecting member. The inner peripheral tooth surface can be smoothly meshed by moving in the radial direction.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the configuration of the vehicle seat coupling device according to the first embodiment will be described with reference to FIGS. Here, FIG. 2 shows a schematic configuration of the vehicle seat 1 of the present embodiment. In the vehicle seat 1, a seat back 2 that serves as a backrest is coupled to a seat cushion 3 that serves as a seating portion by a pair of left and right reclining devices 4 and 4 disposed at lower positions on both sides. Here, the reclining devices 4 and 4 correspond to the vehicle seat coupling device of the present invention.

  The reclining devices 4 and 4 are configured such that operation shafts 4c and 4c that perform switching operation of unlocking each other are integrally connected to each other by a connecting rod 4r. Accordingly, each reclining device 4, 4 is in a locked state in which the backrest angle of the seat back 2 is fixed, and in a released state in which the fixed state is released and the backrest angle of the seat back 2 can be adjusted. The operating states are switched in synchronization with each other. Here, the reclining devices 4 and 4 are normally held in a locked operating state by urging.

  Each reclining device 4, 4 is operated to release the locked state all at once by performing a pull-up operation of the operation lever 5 provided at the side position of the seat cushion 3. Thereby, the fixed state of the backrest angle of the seat back 2 is released, and the backrest angle can be adjusted. Then, by adjusting the backrest angle of the seat back 2 and stopping the release operation of the operation lever 5, the reclining devices 4 and 4 are again returned to the locked state by urging, so that the seat back 2 is adjusted. It is fixed at the backrest angle position.

  Here, the seat back 2 is normally urged in a forward rotation direction by an urging force of an urging spring (not shown) hooked between the seat back 2 and the seat cushion 3. Therefore, when the vehicle seat 1 is not seated and used, the reclining devices 4 and 4 are released from the locked state, whereby the seat back 2 is pushed forward by the urging force, and the seat cushion 3 is moved upward. It will be folded.

  At this time, the reclining devices 4 and 4 are normally returned to the locked state by urging by stopping the release operation of the operation lever 5 when the seat back 2 is in an angle region used as a backrest. However, the rotation angle region of each reclining device 4, 4 includes the angle region of the lock zone that is returned to the locked state by the bias when the release operation is stopped, and the free state that is not returned to the locked state even if the release operation is stopped. The angle area of the zone is set.

  The former lock zone is normally set to an angular region where the seat back 2 is used while being seated, specifically, an angular region where the seat back 2 is tilted backward from an angular position where the seat back 2 is in an upright posture. The latter free zone is an angle region in a forward tilted posture in which the seat back 2 is not used on its back, specifically, an angular region in which the seat back 2 is tilted forward from an angular position where the seat back 2 is in an upright posture. Is set to

  Therefore, when the seat back 2 is moved forward, the reclining devices 4 and 4 are unlocked, and if the seat back 2 is tilted slightly from the upright position, the release operation is stopped. The back 2 is naturally pushed down to the position where it is folded into the upper surface of the seat cushion 3. Hereinafter, the configuration of the reclining devices 4 and 4 will be described in detail. The reclining devices 4 and 4 have a symmetrical configuration with each other, but have substantially the same configuration. Therefore, below, only the configuration of the reclining device 4 shown on the right side in FIG.

  As shown in FIG. 1, the reclining device 4 includes a disk-shaped ratchet 10 and a guide 20, a pair of upper and lower poles 30 and 30 and a slide cam 40 disposed between the disk surfaces, A hinge cam 50 for sliding the slide cam 40, a biasing spring 60 for biasing the hinge cam 50, the ratchet 10 and the guide 20 are sandwiched in the plate thickness direction (axial direction). The holding member 70 for holding is assembled in one piece. Here, the guide 20 corresponds to the connecting member on one side of the present invention, the ratchet 10 corresponds to the connecting member on the other side of the present invention, and the poles 30 and 30 correspond to the locking member of the present invention.

  Specifically, the ratchet 10 is formed with a cylindrical portion 12 that protrudes in a cylindrical shape in the thickness direction at the outer peripheral edge of the disk portion 11. The cylindrical portion 12 is formed by half-cutting the outer peripheral edge of the disc portion 11 in the plate thickness direction. An inner peripheral tooth surface 12a and riding-up portions 12b and 12b are formed on the inner peripheral surface of the cylindrical portion 12 side by side in the circumferential direction. Here, the riding-up portions 12b and 12b are set at two positions that are axially symmetric with respect to the cylindrical portion 12. Each of the riding-up portions 12b and 12b is a flat surface that protrudes radially inward from the inner peripheral tooth surface 12a. The curved surface is formed.

  As shown in FIG. 6, the riding portions 12 b and 12 b described above are arranged in the circumferential direction so as not to interfere with any of the poles 30 and 30, and the respective poles 30 and 30 are connected to the inner peripheral tooth surface 12 a of the ratchet 10. The meshing movement to the outer side in the radial direction to mesh is allowed. Therefore, the circumferential rotation angle region where the interference between the riding portions 12b and 12b and the respective poles 30 and 30 does not allow the pawls 30 and 30 to mesh with the inner peripheral tooth surface 12a of the ratchet 10. Set as a lock zone.

  However, the riding-up portions 12b and 12b are arranged in the circumferential direction in which they interfere with the respective poles 30 and 30, so that each of the poles 30 and 30 tries to mesh with the inner peripheral tooth surface 12a of the ratchet 10. Movement toward the side is prevented by riding on the inner peripheral surface of each of the riding portions 12b, 12b. Therefore, the circumferential rotation angle region where the riding portions 12b and 12b and the poles 30 and 30 interfere with each other is a free zone in which the engagement between the poles 30 and 30 and the inner peripheral tooth surface 12a of the ratchet 10 is prevented. Set as

  By the way, as shown in FIG. 3, the ratchet 10 described above is integrated with the seat back 2 by joining the outer surface of the disk portion 11 to the plate surface of the back frame 2 f forming the skeleton of the seat back 2. Connected. Here, the back frame 2f corresponds to one side of the two target members of the present invention.

  Here, the disc portion 11 of the ratchet 10 is formed with a plurality of dowels 13a... And D dowels 13b that protrude in a cylindrical shape from the outer plate surface. These dowels 13a... And D dowels 13b are arranged and formed at equal intervals in the circumferential direction at a position closer to the outer peripheral edge of the disk portion 11. Among them, the D dowel 13b is formed by cutting out a part of the protruding cylindrical shape into a D-shaped cross section, and the shape is distinguished from the dowel 13a protruding in the cylindrical shape. ing.

  On the other hand, the dowel holes 2a,... And the D dowel holes 2b into which the above-described dowels 13a,. Therefore, by fitting these dowels 13a... And D dowels 13b into dowel holes 2a .. and D dowel holes 2b formed in the back frame 2f, and welding and joining these fitting portions, The ratchet 10 is firmly and integrally connected to the back frame 2f (see FIG. 5).

  At the center of the disk portion 11 of the ratchet 10, a through hole 14 is formed for inserting an operation shaft 4 c (see FIG. 2) for performing the unlocking switching operation of the reclining device 4. The back frame 2f is also provided with a through hole 2c at the same coaxial line as the through hole 14 for the same purpose.

  Next, returning to FIG. 1, the configuration of the guide 20 will be described. The guide 20 is formed in a disk shape having an outer diameter slightly larger than that of the ratchet 10. A cylindrical portion 22 is formed on the outer peripheral edge of the disk portion 21 of the guide 20 so as to protrude in a cylindrical shape in the plate thickness direction, which is an assembling direction to the ratchet 10. The cylindrical portion 22 is formed by half-cutting the outer peripheral edge of the disc portion 21 in the plate thickness direction. As shown in FIG. 5, the cylindrical portion 22 is formed to have a size capable of enclosing the cylindrical portion 12 of the ratchet 10 from the outer peripheral side.

  In a state where the cylindrical portion 12 of the ratchet 10 is assembled in the cylinder of the cylindrical portion 22, the guide 20 and the ratchet 10 slide relative to each other and rotate relative to each other in a state where the cylindrical shapes are fitted to each other. It is in a state that can be. As shown in FIG. 4, the guide 20 is integrally connected to the seat cushion 3 by joining the outer surface of the disk portion 21 to the plate surface of the cushion frame 3 f that forms the skeleton of the seat cushion 3. Has been. Here, the cushion frame 3f corresponds to the other side of the two target members of the present invention.

  Here, the disc portion 21 of the guide 20 is formed with a plurality of dowels 24a... And D dowels 24b that protrude in a cylindrical shape from the outer plate surface. These dowels 24a,... And D dowels 24b are arranged and formed at equal intervals in the circumferential direction at a position closer to the outer peripheral edge of the disk portion 21. Among these, the D dowel 24b is formed by cutting out a part of the protruding cylindrical shape into a D-shaped cross section, and the shape is distinguished from the dowel 24a. ing.

  On the other hand, dowel holes 3a,... And D dowel holes 3b, through which the above-described dowels 24a, .., and D dowels 24b can be fitted, are formed through the cushion frame 3f. Therefore, by fitting these dowels 24a .. and D dowels 24b into dowel holes 3a .. and D dowel holes 3b formed in the cushion frame 3f, respectively, these fitting portions are welded and joined. The guide 20 is firmly and integrally connected to the cushion frame 3f (see FIG. 5).

  A through hole 25 is formed in the center of the disk portion 21 of the guide 20 for inserting the operation shaft 4c (see FIG. 2) for performing the unlocking switching operation of the reclining device 4. And the through-hole 3c is formed also in the cushion frame 3f at the position on the same axis as the through-hole 25 for the same purpose. The through hole 3c is formed in a large shape so that a biasing spring 60 described later can be accommodated in the hole.

  Returning to FIG. 1, a guide groove 23 is formed in the disk portion 21 of the guide 20, the inner plate surface of which is recessed in a “ten” sign shape in the plate thickness direction. The guide groove 23 is formed by half-cutting the disk portion 21 in the plate thickness direction in the shape of a “ten”. Here, the above-mentioned dowels 24a... And D dowels 24b are formed so as to protrude at positions on the outer board surface where the guide grooves 23 are formed. In the guide groove 23, the upper and lower groove portions in the figure are formed as pole grooves 23 a and 23 a that can accommodate respective poles 30 and 30 to be described later.

  As shown in FIG. 7, these pole grooves 23a and 23a are formed in the shape of guide walls 21a and 21b and guide walls 21c and 21d formed as side walls on both the left and right sides. The guide 20 is guided so as to be slid only inward and outward in the radial direction (the vertical direction in the figure) along the shape. Further, the right and left sides of the guide groove 23 extending in the lateral direction and the groove portions therebetween are formed as a single slide cam groove 23b in which a slide cam 40 described later can be housed.

  The slide cam groove 23b is formed in the radial direction of the guide 20 along the groove shape by the shape of the guide walls 21a, 21c and the guide walls 21b, 21d formed as side walls on both upper and lower sides. It is guided so as to be slid only inward and outward (left and right in the figure). Returning to FIG. 1, the disk portion 21 of the guide 20 is formed with spring hook portions 26 and 26 protruding in a pin shape from the outer plate surface. These spring hook portions 26 and 26 are functional parts for hooking an outer end 62 of an urging spring 60 (winding spring), which will be described later, and are arranged in two circumferential directions so that the hook position can be selected. It is formed in the place.

  Next, the configuration of the poles 30 and 30 will be described. The poles 30 and 30 are formed in a frame shape that is slidably accommodated inside the pole grooves 23a and 23a formed in the guide 20 described above. These poles 30 and 30 are formed in a vertically symmetrical shape. Specifically, each of the poles 30 and 30 is formed in an arcuate shape whose outer peripheral edge matches the inner peripheral surface of the cylindrical portion 12 of the ratchet 10 described above. And the outer peripheral tooth surfaces 30a and 30a which can mesh with the inner peripheral tooth surface 12a of the ratchet 10 mentioned above are formed in the outer peripheral surface curved in this circular arc shape.

  Therefore, as shown in FIG. 6, each of the pawls 30, 30 is pressed by a slide cam 40, which will be described later, and slides outward in the radial direction, so that the outer peripheral tooth surfaces 30 a, 30 a It meshes with the inner peripheral tooth surface 12a formed on the surface. Thereby, each pole 30 and 30 and the ratchet 10 will be in an integrated state in the circumferential direction by mutual meshing force. However, the poles 30 and 30 can be slid only inward and outward in the radial direction by the guides by the guide walls 21a and 21c and the guide walls 21b and 21d.

  Accordingly, the ratchet 10 is in a state in which relative rotation with respect to the guide 20 is restricted via the poles 30 and 30. As a result, the reclining device 4 is rotationally locked. The rotation lock state of the reclining device 4 is released when the poles 30 and 30 are pulled inward in the radial direction and removed from the meshed state with the ratchet 10, as shown in FIG.

  Here, the operation of sliding the poles 30 and 30 inward and outward in the radial direction is performed by a sliding operation of a slide cam 40 disposed between the poles 30 and 30. As shown in FIG. 1, the slide cam 40 is formed in a frame shape that is accommodated in the slide cam groove 23 b formed in the guide 20 described above. The slide cam 40 is formed in a vertically symmetric shape, and shoulders 42 and 42 for pushing the poles 30 and 30 outward in the radial direction are formed on the upper and lower edges of the slide cam 40 and the poles 30. , 30 are formed on the inner side in the radial direction.

  Here, the above-described poles 30 and 30 are formed in a gate shape in which the shape on the radially inner side is partially cut out. Each of the poles 30, 30 is brought into contact with the upper and lower edges of the slide cam 40 by the leg portions 32, 32 forming both gate-shaped legs. A pressing operation is performed on the side. Specifically, as shown in FIG. 6, in the state where the slide cam 40 is slid to the left side in the drawing, each pole 30, 30 is connected to each leg portion 32, each shoulder portion 42, The state of being pushed on 42 is held in a state of being pushed outward in the radial direction.

  Thereby, each pole 30 and 30 is always hold | maintained as the state which mesh | engaged those outer peripheral tooth surfaces 30a and 30a with the inner peripheral tooth surface 12a of the ratchet 10. FIG. Then, as shown in FIG. 7, each pole 30, 30 is slid to each hanging portion 31, 31 formed on the inner side of the portal shape by sliding the slide cam 40 to the right side in the figure. The hooks 44 of the cam 40 are hooked and pulled inward in the radial direction. As a result, the legs 32 and 32 of the poles 30 and 30 are pulled from the position where the legs 32 and 32 are riding on the shoulders 42 and 42 of the slide cam 40 to the inside of the grooves 43 and 43 at the left side position. The meshing state between the poles 30 and 30 and the ratchet 10 is released.

  These groove portions 43, 43 are formed in a shape that is smoothly recessed from the respective shoulder portions 42, 42, and the slide cam 40 slides to the right side as shown in FIG. The leg portions 32, 32 are in a state of riding on the shoulder portions 42, 42 while being guided by the shapes of the groove portions 43, 43. Here, the operation of sliding the slide cam 40 in the left-right direction in the drawing is performed in accordance with the rotation operation of the hinge cam 50 assembled in the cam hole 41 penetratingly formed in the central portion of the slide cam 40.

  As shown in FIG. 1, the hinge cam 50 is rotatably assembled in a cam hole 41 formed through the center of the slide cam 40. The hinge cam 50 is normally urged to rotate in the clockwise direction shown in FIG. 1 by the urging force of an urging spring 60 (winding spring) hooked between the hinge cam 50 and the guide 20. Here, as shown in FIG. 4, the urging spring 60 is in a state of being twisted in advance, and its inner end 61 is hooked on the spring hooking portion 51 of the hinge cam 50, and the outer end 62 is hooked on the guide 20. It is hooked on the spring hook portion 26.

  Accordingly, as shown in FIG. 6, the hinge cam 50 is normally pressed from the inner peripheral surface side of the cam hole 41 by the operation projection 52 formed to protrude on the outer peripheral portion thereof, and the left side in the drawing. To slide. As a result, the poles 30 and 30 are held in a state where the pawls 30 and 30 are engaged with the ratchet 10 as the leg portions 32 and 32 ride on the shoulder portions 42 and 42 of the slide cam 40.

  The hinge cam 50 is integrally connected to the operation shaft 4c described above with reference to FIG. Thereby, the hinge cam 50 is rotated counterclockwise in the figure against the urging of the urging spring 60 shown in FIG. 1 as the operation lever 5 (see FIG. 2) is pulled up. ing. That is, the hinge cam 50 is rotated in the clockwise direction of FIG. 6 by the above-described operation. As a result, as shown in FIG. 7, the slide cam 40 is slid to the right in the figure, and the poles 30 and 30 are released from the meshed state with the ratchet 10.

  Next, returning to FIG. 1, the holding member 70 will be described. The holding member 70 is formed by punching a thin steel plate into a ring shape and half-punching it in the axial direction. The second seating surface portion 72 is formed in a cylindrical shape having a step shape. Here, as shown in FIG. 5, the first seat surface portion 71 faces the outer plate surface of the cylindrical portion 12 of the ratchet 10 in the axial direction when the ratchet 10 is assembled in the cylinder of the holding member 70. Is formed.

  The second seat surface portion 72 is formed so as to come into surface contact with the inner surface of the cylindrical portion 22 of the guide 20 when the guide 20 is assembled into the cylinder of the holding member 70. A cylindrical portion that protrudes in a cylindrical shape in the axial direction is formed from the outer peripheral edge portion of the second seat surface portion 72, and after the assembly of the ratchet 10 and the guide 20, the cylindrical portion protrudes in the radial direction. A folding surface portion 73 that is bent inward and caulked is set.

  Therefore, when the ratchet 10 is inserted into the cylinder of the holding member 70 having the above-described configuration, the ratchet 10 has each projection in which the outer disk surface of the cylindrical portion 12 is formed to protrude on the inner plate surface of the first seat surface portion 71. It is assembled in a state where the axial insertion position is positioned with respect to the holding member 70 at a position in point contact with the portions 71a. As a result of this assembly, the ratchet 10 is in a state in which the outer peripheral edge portion of the cylindrical portion 12 is surrounded by a cylindrical portion that is a connecting portion between the first seat surface portion 71 and the second seat surface portion 72 of the holding member 70. Assembled.

  Then, by assembling assembly parts such as the poles 30 and 30 and the slide cam 40 on the disk portion 11 of the ratchet 10, and then inserting the guide 20 into the cylinder of the holding member 70, the guide 20 is The inner board surface of the part 22 is assembled in a state where the insertion position in the axial direction is positioned with respect to the holding member 70 at a position where the inner surface of the part 22 comes into surface contact with the second seat surface part 72.

  Then, after assembling, the tip of the cylindrical portion (folded curved surface portion 73) protruding to the outer plate surface side of the cylindrical portion 22 of the guide 20 is bent radially inward and caulked to the outer plate surface of the cylindrical portion 22. Thus, the holding member 70 is coupled and fixed integrally with the guide 20. Thereby, the ratchet 10 and the guide 20 are assembled in a state in which the ratchet 10 and the guide 20 are sandwiched in the axial direction by the holding member 70 and prevented from coming off.

  Here, referring to FIG. 5, the cylindrical portion 12 of the ratchet 10 has the disk seat 21 of the guide 20 and the first seat of the holding member 70 with the assembly parts such as the poles 30 and 30 and the slide cam 40 interposed therebetween. It can be assembled with a slight gap in the axial direction between the surface portion 71. Thereby, the rotational movement of the ratchet 10 relative to the guide 20 can be smoothly performed without being hindered by the sliding friction with the holding member 70.

  By the way, as shown in FIG. 8, the outer peripheral tooth surfaces 30a, 30a of the respective poles 30, 30 described above slightly increase in size of the constituent teeth arranged in the circumferential direction from the center toward both ends. It is formed so that it gets smaller. Thus, the outer peripheral tooth surfaces 30a, 30a of the poles 30, 30 that are movable only in the radial direction are smoothly meshed with or removed from the inner peripheral tooth surface 12a of the ratchet 10 that is curved in a perfect circle shape. You can also.

  Here, the end teeth a1 and a1 formed at the ends of the poles 30 and 30 in the clockwise direction shown in the figure have the same tooth profile as the second teeth a2 and a2 from the end (however, the tooth shape is small). However, the radius of the curve that draws the tooth tip is increased. Specifically, the end teeth a1 and a1 and the second teeth a2 and a2 have tooth shapes excluding their tooth tips drawn by the same curve (involute curve), and tooth shapes that are similar to each other It is formed in a shape (see FIG. 9). Here, the end teeth a1 and a1 correspond to the first component teeth of the present invention, and the second teeth a2 and a2 correspond to the second component teeth of the present invention. In addition, the tooth profile shown by the phantom line in FIG. 9 is a tooth profile when the size of the tooth profile of the end teeth a1 and a1 is enlarged to the same size as the tooth profile of the second teeth a2 and a2.

  As shown in FIG. 8, each of the poles 30, 30 having the above-described configuration, for example, is lifted up vigorously by a spring force from a position where the seat back 2 (see FIG. 2) is moved backward, and the reclining device 4 is locked. When it is attempted to return to the locked state when entering the free zone from the zone, the tooth a1 at the end on the end side in the clockwise direction of the poles 30 and 30 is caused by the relative rotation of the ratchet 10 in the counterclockwise direction of the illustration. , A1 may collide with the inclined end surfaces bt, bt of the riding-up portions 12b, 12b.

  However, the end teeth a1 and a1 are formed so that the radius of the curve describing the tip of the teeth is larger than that of the adjacent second teeth a2 and a2 and the load strength is increased. Even if it is received, it is difficult to be crushed or broken. Thus, damage to the constituent teeth of the poles 30 and 30 can be prevented by a simple structure in which the radius of the tip of the end teeth a1 and a1 is increased. Further, the end teeth a1 and a1 are formed so that the radius of the curve describing the tip of the tooth is large, so that when the end teeth bt and bt are pressed against the inclined end surfaces bt and bt, the end surfaces bt , Bt is easily moved and guided in the direction of meshing with the inner peripheral tooth surface 12a of the ratchet 10 along the inclination of bt.

  Therefore, even in the state where the force is applied in the rotational direction as described above, each of the poles 30 and 30 can be satisfactorily returned to the locked state at the position between the lock zone and the free zone.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, in the above embodiment, the vehicle seat connecting device of the present invention is applied as the reclining device 4 that connects the seat back 2 to the seat cushion 3 so that the backrest angle can be adjusted. However, this connecting device can also be applied to applications in which the tiltable seat back is connected to the vehicle body floor.

  Further, the connecting device can be applied to an application for connecting the seat body so as to be rotated in the turning direction with respect to the vehicle body floor. Further, the connecting device can be applied to an application in which a so-called ottoman device that lifts and supports the lower leg of the seated person from below is connected to the seat cushion or the vehicle body floor so as to be tiltable.

  In addition, the outer peripheral tooth surfaces 30a and 30a of the poles 30 and 30 are such that the teeth a1 and a1 at the ends are formed smaller than the second teeth a2 and a2. It may be formed.

  Moreover, although the slide cam 40 was shown as an operation member for moving the two poles 30 and 30 forward and backward simultaneously in the radial direction for the reclining device 4, for example, as disclosed in JP-A-2005-321891 Alternatively, a configuration using a rotary cam that allows three or more poles to be simultaneously advanced and retracted may be used.

1 is an exploded perspective view of a reclining device according to Embodiment 1. FIG. It is a perspective view showing the schematic structure of the vehicle seat. It is a perspective view showing the assembly state of the reclining device. It is a perspective view showing the assembly state of the reclining device. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. 3 showing the locked state of the reclining apparatus. It is sectional drawing showing the state which cancelled | released the locked state of the reclining apparatus from the state of FIG. It is the block diagram showing the state where the edge part of the pole contacted the riding part of the ratchet in the circumferential direction. It is the schematic diagram which piled up and expressed the tooth of the end and the 2nd tooth.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 2f Back frame (one side of two object members)
2a Dowel hole 2b D Dowel hole 2c Through hole 3 Seat cushion 3f Cushion frame (the other side of the two target members)
3a Dowel hole 3b D Dowel hole 3c Through hole 4 Reclining device (vehicle seat coupling device)
4c Operation shaft 4r Connection rod 5 Operation lever 10 Ratchet (connection member on the other side)
DESCRIPTION OF SYMBOLS 11 Disk part 12 Cylindrical part 12a Inner peripheral tooth surface 12b Riding part bt End surface 13a Dowel 13b D dowel 14 Through-hole 20 Guide (one side connection member)
21 disk part 21a-21d guide wall 22 cylindrical part 23 guide groove 23a pole groove 23b slide cam groove 24a dowel 24b D dowel 25 through hole 26 spring hook part 30 pole (lock member)
30a peripheral tooth surface a1 end tooth (first component tooth)
a2 Second tooth (second component tooth)
DESCRIPTION OF SYMBOLS 31 Hanging part 32 Leg part 40 Slide cam 41 Cam hole 42 Shoulder part 43 Groove part 44 Hook 50 Hinge cam 51 Spring hook part 52 Operation protrusion 60 Energizing spring 61 Inner end 62 Outer end 70 Holding member 71 1st seat surface part 71a Projection part 72 Second seat part 73 Folding curved part

Claims (2)

A vehicle seat coupling device that couples two target members such that they can rotate relative to each other,
Two connecting members each having a disk-like portion integrally connected to one side or the other side of the two target members and assembled to each other so as to be rotatable relative to each other;
The outer peripheral tooth surface is arranged between the two connecting members and is assembled to the one connecting member and supported in the circumferential direction on the inner peripheral tooth surface formed on the other connecting member. And a locking member that can lock the relative rotation between the two connecting members by meshing,
The connecting member on the other side is formed with a riding portion protruding radially inward from the inner peripheral tooth surface, and the riding portion is located at a position where the locking member is engaged and moved. The locking member is ridden by to prevent the meshing movement,
The first component tooth formed at the circumferential end of the outer peripheral tooth surface of the lock member has the same tooth shape as the second adjacent component tooth second from the end, but the tooth tip is the same. A connecting device for a vehicle seat, wherein a radius of a curve to be drawn is increased. The vehicle seat coupling device according to claim 1,
The inner peripheral tooth surface formed on the other side connecting member is formed in a circular shape like the inner peripheral tooth surface of the internal gear, and the outer peripheral tooth surface of the lock member is the inner peripheral tooth surface. And the first component teeth of the outer peripheral tooth surface are formed in a smaller tooth profile than the second component teeth. Sheet connecting device.

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