JP2007130307A - Reclining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a reclining device which does not forcibly form many protuberances on first and second disk members, and in addition, can prevent the generation of a large thermal strain by welding from occurring, and does not reduce the maneuver function of the reclining device. <P>SOLUTION: The counter surface of an upper arm 202 with a ratchet plate (the first disk member) is provided with an annular protuberance 202t which is one surrounding the rotation center shaft O and the flat distal end surface of which comes into contact with the external surface of the ratchet plate. By the contact section, the ratchet plate and the upper arm are welded. In addition, the counter surface of a lower arm with a base plate (the second disk member) is provided with an annular protuberance which is one surrounding the rotating center shaft O and the flat distal end surface of which comes into contact with the external surface of the base plate. By the contact section, the base plate and the lower arm are welded. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reclining device that adjusts the angle of a backrest of a vehicle seat. More specifically, the first disk member and the second disk member are stacked so as to be relatively rotatable, and an angle adjustment mechanism that adjusts the relative rotation angle between the first and second disk members between the first and second disk members. The reclining unit in which a plurality of protrusions are disposed on the outer surfaces of the first and second disk members so as to surround the rotation center axis of the relative rotation and the protrusions of the first disk member A hole is formed, and a fitting hole is formed between the upper arm welded to the first disk member in a state in which the protrusion of the first disk member is inserted into the fitting hole, and the protrusion of the second disk member; The present invention relates to a reclining device having a lower arm welded to a second disk member in a state in which a protrusion of the second disk member is fitted into the fitting hole.

  In this type of reclining device, there is an advantage that the reclining unit can be made common only by changing the shapes of the upper arm and the lower arm in accordance with the vehicle type. As the reclining unit, there are a power type driven by a motor (for example, see Patent Document 1) and a manual type driven by a hand (for example, see Patent Document 2).

  As illustrated in FIG. 9, in a general reclining unit 20 (which is a manual type), a first disk member 21 and a second disk member 22 are stacked so as to be relatively rotatable, and the first and second disks are stacked. An angle adjusting mechanism is provided between the members 21 and 22 to adjust the relative rotation angle between the first and second disk members 21 and 22.

  A plurality of protrusions 21 a are disposed on the outer surface of the first disk member 21 so as to surround the rotation center axis O of relative rotation, and the rotation center axis of relative rotation is disposed on the outer surface of the second disk member 22. A plurality of protrusions 22a are disposed so as to surround O.

  On the other hand, the upper arm 30 is formed with a fitting hole 30a with the projection 21a of the first disk member 21, and the upper arm 30 is in a state where the projection 21a of the first disk member 21 is fitted into the fitting hole 30a. It is welded to the first disk member 21. The lower arm 40 is formed with a fitting hole 40a with the protrusion 22a of the second disk member 22, and the lower arm 40 is in a state where the protrusion 22a of the second disk member 22 is inserted into the fitting hole 40a. It is welded to the disk member 22.

  Conventionally, carbon dioxide arc welding (MAG welding) is used for welding the upper arm 30 and the first disk member 21. And in this welding, the front-end | tip part of each processus | protrusion 21a and the upper arm 30 (peripheral part of the fitting hole 30a in which each processus | protrusion 21a was inserted) are welded. The welding region is not the entire circumference of the annular gap between the protrusion 21a and the fitting hole 30a, but a region of about 1/2 to 1/3.

Similarly, carbon dioxide arc welding is also used for welding the lower arm 40 and the second disk member 22. And also in this welding, the front-end | tip part of each processus | protrusion 22a and the lower arm 40 (peripheral part of the fitting hole 40a in which each processus | protrusion 22a was inserted) are welded.
JP 2002-112848 A JP 2003-61772 A

  In this type of reclining device, when a vehicle or the like collides, a large load is applied to the lower arm from the upper arm side via the first disk member or the second disk member, but at this time, between the upper arm and the first disk member, In addition, a large load acts on each fastening portion between the lower arm and the second disk member.

  In order to withstand this load, conventionally, the number of projections to be welded was increased to increase the fastening strength. However, it is difficult to form further projections on the first and second disk members in terms of processing technology. Yes. Furthermore, since the number of welding locations increases, a large thermal distortion is caused by welding on the first and second disk members, and the smooth operation of the reclining device is lowered due to the influence.

  The present invention solves the above-mentioned problem, and its purpose is not to force the first and second disk members to form many protrusions, and also to prevent the occurrence of large thermal distortion due to welding. An object of the present invention is to realize a reclining device that does not deteriorate the motor function.

  In the invention according to claim 1 for solving the above-described problem, the first disk member and the second disk member are stacked so as to be relatively rotatable, and between the first and second disk members, between the first and second disk members. A reclining unit provided with an angle adjustment mechanism for adjusting a relative rotation angle; an upper arm welded to the outer surface of the first disk member; and a lower arm welded to the outer surface of the second disk member. In the reclining device, an annular surface surrounding a rotation center axis of relative rotation between the first disk member and the second disk member is formed on at least one of the facing surfaces of the first disk member and the upper arm. An annular protrusion whose flat front end surface is in contact with the other opposing surface, and the contact between the first disk member and the upper arm is provided, An annular protrusion that surrounds the rotation center axis and is also on at least one of the opposing surfaces of the two-disc member and the lower arm, the flat tip surface of which is in contact with the other opposing surface The reclining device is characterized in that the second disk member and the lower arm are welded by the contact portion.

  In the present invention, an annular protrusion having a flat tip surface is provided on one of the pair of facing surfaces, the flat tip surface is brought into contact with the other facing surface, and the contact portion is welded by, for example, laser welding. The belt-like welding surface is formed in an annular shape, and a wide welding area can be easily secured.

  In the invention according to claim 2, the first disk member and the second disk member are stacked so as to be relatively rotatable, and the relative rotation angle between the first and second disk members is adjusted between the first and second disk members. A reclining unit provided with a plurality of protrusions so as to surround the rotation center axis of the relative rotation on each outer surface of the first and second disk members, and the first disk member And an upper arm welded to the first disk member in a state in which the protrusion of the first disk member is fitted in the fitting hole, and a hole of the second disk member A recliner having a lower hole welded to the second disk member in a state in which a fitting hole with the protrusion is drilled, and the protrusion of the second disk member is inserted into the fitting hole; Opposing the first disk member and the upper arm At least one of the opposing surfaces of the first and second disk members, and an annular protrusion surrounding the rotation center axis of the relative rotation of the first disk member and the second disk member, the flat tip surface of which is the other opposing surface. An annular projection is provided, and the first disk member and the upper arm are welded at the contact portion, and at least one of the opposing surfaces of the second disk member and the lower arm is provided. Is also provided with an annular projection surrounding the rotation center axis, the flat tip surface of which is in contact with the other opposing surface, and with this contact portion, the second disk member and The reclining device is welded to the lower arm.

  Also in this invention, similarly to the invention according to claim 1, an annular protrusion having a flat tip surface is provided on one of a pair of facing surfaces, and the flat tip surface is brought into contact with the other facing surface. Since the portion is welded by, for example, laser welding, a belt-like weld surface is formed in an annular shape, and a wide welding area can be easily secured.

  According to a third aspect of the present invention, in the reclining device according to the first or second aspect, the annular protrusion is formed on the upper arm and the lower arm by a half punching method, and the first and second disk members Is characterized in that the annular protrusion is not formed.

  In general, the upper arm and the lower arm are thinner than the first and second disk members. However, since the annular projections are formed by the half-punching method, not only the rigidity of the upper and lower arms is increased, but also the tip surfaces of the annular projections are increased. Flatness will also increase.

  According to a fourth aspect of the present invention, in the reclining device according to the second aspect, a plurality of the outer surfaces of the first and second disk members are arranged on a single circle centered on the rotation center axis. A protrusion is disposed on the upper arm and the lower arm, and the annular protrusion is a circle with a radius that does not interfere with the fitting hole with the rotation center axis as a center, and a radius that surrounds the fitting hole inside It is characterized by being formed by a half punching method along the circle.

  In the present invention, the fitting hole and the annular protrusion are aligned around the rotation center axis. For this reason, the annular projection is accurately formed, and the flatness of the tip surface is further increased.

  According to the inventions according to claims 1 and 2, since a wide welding area can be secured easily due to the presence of the annular protrusion, it is necessary to form a large number of protrusions on the first and second disk members from the request for improvement in fastening strength. Disappear. Further, since, for example, laser welding is performed over the entire circumference of the annular protrusion, it is possible to prevent the occurrence of large thermal distortion due to welding, and the motion function of the reclining device does not deteriorate.

  According to the invention of claim 3, the annular protrusion formed by the half-punch method increases the rigidity of the thin upper arm and the lower arm and the flatness of the tip surface of the annular protrusion. High fastening strength can be obtained.

  According to the invention which concerns on Claim 4, since a cyclic | annular protrusion is shape | molded correctly and the flatness of the front end surface rises further, a more favorable welding state is obtained and higher fastening strength can be obtained.

  An embodiment (manual type) of the present invention will be described with reference to FIGS. First, as shown in FIG. 3, in the reclining device of this embodiment, a base plate 100 as a second disk member is attached to the lower arm 201 on the seat cushion side, and a ratchet as a first disk member is attached to the upper arm 202 on the seat back side. A plate 130 is attached.

  As shown in FIGS. 2 to 5, the disc-shaped ratchet plate 130 is fitted to the disc-shaped base plate 100, so that the two are overlapped so as to be relatively rotatable. The reclining unit 90 is completed by providing an angle adjusting mechanism (described later) for adjusting the relative rotation angle between the base plate 100 and the ratchet plate 130 between the base plate 100 and the ratchet plate 130.

  The cylindrical mounting bracket 205 wraps the base plate 100 and the ratchet plate 130 from the outside, and prohibits the ratchet plate 130 from separating from the base plate 100. Specifically, one end of the mounting bracket 205 is locked to the outer peripheral portion of the base plate 100, and the ratchet plate holding portion 205a on the other end side presses the ratchet plate 130 from the rotation center axis direction.

  A hole 101 and a hole 131 are formed at positions on the rotation center axis of the base plate 100 and the ratchet plate 130, and the operation shaft 120 is inserted into the hole 101 and the hole 131. As shown in FIGS. 3 and 5, a circular recess 132 centered on the operation shaft 120 is formed on the surface of the ratchet plate 130 facing the base plate 100, and the inner peripheral wall surface of the recess 132 has an inner wall. Teeth 133 are engraved.

  As shown in FIGS. 3 and 5, a concave portion 104 is formed on the surface of the base plate 100 facing the concave portion 132 of the ratchet plate 130. As shown in FIG. A pair of guide projections 105, 106 and a pair of guide projections 107, 108 project toward the plate 130.

  In this embodiment, the base plate 100 is manufactured by using forging, and in this case, the guide protrusions 105, 106 are formed so that no recess is formed on the back side of the guide protrusions 105, 106, 107, and 108 on the base plate 100. , 107 and 108 are formed in a solid shape, and the thickness of the peripheral portion thereof is made sufficiently large to increase the strength of the guide protrusions 105, 106, 107 and 108.

  On the surface of the base plate 100 opposite to the ratchet plate 130 side (the outer surface of the base plate 100), a plurality of protrusions 100a are equidistantly arranged on the same circumference around the hole 101 (coaxial with the rotation center axis O). It is arranged. A plurality of protrusions 130 a are also arranged at equal intervals on the same circumference around the hole 131 on the surface of the ratchet plate 130 opposite to the base plate 100 (the outer surface of the ratchet plate 130).

  The pole 140 has outer teeth 141 that can be engaged and disengaged from the radial direction of the tip circle on the inner teeth 133 of the ratchet plate 130 on the front end surface side, and as shown in FIG. 6, the guide surfaces of the guide protrusions 105 and 106 105a and 106a are slidably guided in the direction orthogonal to the rotation center axis of the ratchet plate 130, that is, in the radial direction of the tip circle of the internal teeth 133.

  The pole 150 has the same shape as the pole 140, is sandwiched between the guide surfaces 107a and 108a of the guide protrusions 107 and 108, is slidably guided in the radial direction of the tip circle of the inner tooth 133, and is on the front end surface side. The outer teeth 151 can be engaged with the inner teeth 133 of the ratchet plate 130.

  A cam 170 that can rotate together with the operation shaft 120 is disposed in the space on the rear end surfaces 146 and 156 side of the poles 140 and 150. That is, as shown in FIG. 3, a cross-sectional oval portion 123 is formed in the intermediate portion of the operation shaft 120, and this cross-sectional oval portion 123 is fitted in the oval hole 171 of the cam 170. As a result, the operation shaft 120 and the cam 170 are fitted in a state where relative rotation is impossible, and the cam 170 rotates together with the operation shaft 120.

  The poles 140 and 150 and the cam 170 are formed to have the same thickness and are disposed on the same plane of the base plate 100. The cam 170 has an inclined cam surface 174b for pressing the rear end surfaces 146 and 156 of the poles 140 and 150 when the cam 170 rotates to mesh the outer teeth 141 and 151 of the poles 140 and 150 with the inner teeth 133 of the ratchet plate 130. , 175b. In order to exert this function, the inclined cam surfaces 174b and 175b are inclined with respect to the contact between the inclined cam surfaces 174b and 175b and the rear end surfaces 146 and 156 of the poles 140 and 150 when the cam 170 rotates in the locking direction. The point is set in a direction away from the rotation center axis O of the cam 170. For example, the inclined cam surface 175b in FIG.

  Further, the cam 170 is positioned on the front side in the rotation direction when the cam 170 is locked (counterclockwise in FIG. 7) with respect to the inclined cam surfaces 174b and 175b, and the external teeth 141 and 151 of the poles 140 and 150 and the ratchet. When meshing with the internal teeth 133 of the plate 130, support surfaces 174a and 175a are provided at the ends of the rear end surfaces 146 and 156 of the poles 140 and 150 (front portions in the rotation direction when the cam 170 is locked) via a gap. ing. When the counterclockwise load in FIG. 7 is applied from the ratchet plate 130 to the poles 140 and 150 from the ratchet plate 130, the support surfaces 174a and 175a abut against the ends of the rear end surfaces 146 and 156 of the poles 140 and 150. And further tilting of the poles 140 and 150 is prohibited.

  Further, the cam 170 is located on the rear side in the rotation direction when the cam 170 is locked with respect to the inclined cam surfaces 174b and 175b, and between the outer teeth 141 and 151 of the poles 140 and 150 and the inner teeth 133 of the ratchet plate 130. Support surfaces 174c and 175c are provided so as to face the end portions of the rear end surfaces 146 and 156 of the poles 140 and 150 (the rear side portion in the rotation direction when the cam 170 is locked) when engaged. When the clockwise load in FIG. 7 is applied from the ratchet plate 130 to the poles 140 and 150 from the ratchet plate 130, the support surfaces 174c and 175c come into contact with the ends of the rear end surfaces 146 and 156 of the poles 140 and 150. It supports and prohibits further tilting of the poles 140 and 150.

  Cam grooves 144 and 154 are formed on the surface of the poles 140 and 150 on the ratchet plate 130 side (in this embodiment, the cam grooves 144 and 154 are holes penetrating to the surface on the base plate 100 side). . The release plate 180 constituting the release means is arranged so that one surface thereof overlaps with the poles 140 and 150 and the cam 170 and the other surface is in sliding contact with the ratchet plate 130. A hole 181 through which the operation shaft 120 is inserted is formed in the central portion of the release plate 180.

  As shown in FIGS. 6 and 7, the cam 170 has protrusions 176 and 177 protruding toward the ratchet plate 130, and these protrusions 176 and 177 are formed at the edge of the hole 181 of the release plate 180. It is fitted in small slots 182 and 183 extending in the radial direction. For this reason, the cam 170 and the release plate 180 rotate in conjunction with each other.

  Further, as shown in FIGS. 3 and 6, projections 183 and 184 that engage with the cam grooves 144 and 154 are formed at the rotating end portion of the release plate 180 by press molding or the like. The cam grooves 144 and 154 are shaped so that when the release plate 180 rotates in the clockwise direction in FIG. 6, the pawls 140 and 150 are moved toward the rotation center side of the cam 170 by the interaction between the cam grooves 144 and 154 and the protrusions 183 and 184. It is set to move forcibly.

  As shown in FIGS. 6 and 7, the spiral springs 191 and 195 as urging means have inner ends hooked to the hooks 111 and 112 of the base plate 100 and outer ends hooked to the step portions 178 and 179 of the cam 170. The cam 170 is rotated and biased so that the cam 170 pushes the rear end surfaces 146 and 156 of the poles 140 and 150.

  In particular, as shown in FIGS. 1 and 3, the upper arm 202 is formed with a fitting hole 202 h with the protrusion 130 a of the ratchet plate 130. Further, on the surface of the upper arm 202 facing the ratchet plate 130, there is provided an annular projection 202 t centering on the rotation center axis O and having a flat tip surface abutting against the outer surface of the ratchet plate 130. The ratchet plate 130 and the upper arm 202 are welded by the contact portion. At the time of this welding, the protrusion 130a of the ratchet plate 130 is fitted in the fitting hole 202h. The annular protrusion 202t is formed along a radius circle that does not interfere with the plurality of fitting holes 202h by a half punching method.

  Similarly, the lower arm 201 is provided with a fitting hole 201h with the protrusion 100a of the base plate 100, as shown in FIG. Further, the lower arm 201 is provided with an annular protrusion 201t that is an annular protrusion centered on the rotation center axis O and whose flat front end surface is in contact with the outer surface of the base plate 100 on the surface facing the base plate 100. The base plate 100 and the lower arm 201 are welded by the contact portion. At the time of this welding, the protrusion 100a of the base plate 100 is fitted in the fitting hole 201h. The annular protrusion 201t is formed along a radius circle that does not interfere with the plurality of fitting holes 201h by a half punching method.

  The operation of the reclining device having the above configuration will be described. In the locked state, the urging force of the spiral springs 191 and 195 causes the cam 170 to push the rear end surfaces 146 and 156 of the poles 140 and 150, and the external teeth 141 and 151 of the poles 140 and 150 mesh with the internal teeth 133 of the ratchet plate 130. In this state, the rotation of the ratchet plate (seat back) 130 is prohibited.

  The movement at the time of shifting to the locked state will be described. The cam 170 that receives the urging force of the spiral springs 191 and 195 is a direction in which the external teeth 141 and 151 of the poles 140 and 150 mesh with the internal teeth 133 of the ratchet plate 130. Rotate first. Accordingly, the inclined cam surfaces 174b and 175b of the cam 170 press the rear end surfaces 146 and 156 of the poles 140 and 150, and the outer teeth 141 and 151 of the poles 140 and 150 mesh with the inner teeth 133 of the ratchet plate 130. Move in the radial direction.

  In a locked state in which the external teeth 151 of the pawl 150 and the internal teeth 133 of the ratchet plate 130 are engaged, when a load is applied from the ratchet plate 130 to the pawl 150 due to a vehicle collision or the like, the pawl 150 has an inclined cam surface 175b of the cam 170 and It will be supported by the support surfaces 175a and 175c.

  When the operation shaft 120 is rotated clockwise in FIG. 7 against the biasing force of the spiral springs 191 and 195 in the locked state, and the cam 170 is also rotated clockwise, the rear end surfaces of the poles 140 and 150 of the cam 170 are rotated. 146 and 156 are released, the projections 183 and 184 of the release plate 180 are in sliding contact with the inclined wall surfaces of the cam grooves 144 and 154 of the poles 140 and 150, and the external teeth 141 and 151 of the poles 140 and 150 are ratchet. The poles 140 and 150 retreat in a direction away from the inner teeth 133 of the plate 130, the meshing between the outer teeth 141 and 151 of the poles 140 and 150 and the inner teeth 133 of the ratchet plate 130 is released, and the ratchet plate (seat back) 130 can be tilted (unlocked state).

  When the seat back is tilted to a desired angle and the operation force to the operation shaft 120 is released, the cam 170 pushes the rear end surfaces 146 and 156 of the poles 140 and 150 by the urging force of the spiral springs 191 and 195, The 150 external teeth 141 and 151 mesh with the internal teeth 133 of the ratchet plate 130 again, and the ratchet plate (seat back) 130 returns to a state in which rotation is prohibited.

  In addition, when an excessive load is applied to the upper arm 202 in the locked state, separation may occur at the welded portions of the annular protrusions 202t and 201t. In such a case, the ratchet plate 130 fitted in the fitting hole 202h is used. The protrusions 130a of the base plate 100 and the protrusions 100a of the base plate 100 fitted into the fitting holes 201h prevent excessive peeling.

According to the configuration of such an embodiment, the following effects can be obtained.
(1) In this embodiment, the annular protrusions 202t and 201t form a belt-like weld surface in an annular shape, and a large welding area can be easily secured. Therefore, it is not necessary to form a large number of protrusions 130a and 100a on the ratchet plate 130 and the base plate 100 due to a request for improving the fastening strength. Further, since, for example, laser welding is performed over the entire circumference of the annular protrusions 202t and 201t, generation of a large thermal distortion due to welding can be prevented, and the motion function of the reclining device does not deteriorate.
(2) In general, the plate thickness of the upper arm 202 and the lower arm 201 is thinner than that of the ratchet plate 130 and the base plate 100. However, since the annular protrusions 202t and 201t are formed by the half-punching method, only the rigidity of the upper arm 202 and the lower arm 201 is increased. In addition, the flatness of the tip surfaces of the annular protrusions 202t and 201t also increases. Therefore, a good welding state can be obtained, and higher fastening strength can be obtained.
(3) Since the fitting holes 202h and 201h and the annular protrusions 202t and 201t are aligned with the rotation center axis O as the center, the annular protrusions 202t and 201t are accurately formed, and the flatness of the tip surface is further increased. . Therefore, a better welded state can be obtained and a higher fastening strength can be obtained.

  The present invention is not limited to the above embodiment. For example, the outer shape of the annular protrusions 202t and 201t is not limited to a perfect circle. Even when the annular protrusions 202t and 201t are formed in a perfect circle, the annular protrusions 202t and 201t may be formed eccentrically with respect to the rotation center axis O without being centered on the rotation center axis O. However, it is preferable to surround the rotation center axis O so as to form a weld around the rotation center axis O. Further, the annular protrusions 202t and 201t may be provided on the ratchet plate 130, the base plate 100, or both.

  Further, the reclining unit may be a power type instead of a manual type. Hereinafter, an example of the power type reclining unit will be described with reference to FIG.

  The reclining unit 221 has external teeth formed on the outer peripheral surface along the tilting central axis, and is attached to an external gear (first disk member) 223 attached to an upper arm (not shown) and a lower arm (not shown). An internal gear (second disk member) which is formed in a bowl shape by a punching method, meshes with the external teeth of the external gear 223 on the inner wall, and has internal teeth (not shown) having more teeth than the external teeth. 225 and a pressing member 241 that fits on the outer peripheral surface of the internal gear 225 and sandwiches the internal gear 225 and the external gear 223 in a superposed state.

  A cylindrical portion 227 extending toward the internal gear 225 is formed at the center of the external gear 223, and the cylindrical portion 227 is inserted into a through hole 229 formed at the center of the internal gear 225. Further, a rotating shaft 231 is inserted through the cylindrical portion 227. In the space between the outer peripheral surface of the cylindrical portion 227 and the inner peripheral surface of the through-hole 129 of the internal gear 225, plane symmetry that maintains the meshing of the external teeth of the external gear 223 and the internal teeth of the internal gear 225. A pair of wedge-shaped members 233 and 235 having a shape are arranged. The wedge-shaped members 233 and 235 are urged away from each other by a spring 237, whereby the internal teeth of the internal gear 225 and the external teeth of the external gear 223 mesh with each other to form a planetary gear train. (The wedge-shaped members 233 and 235 play a role of links that cause the external gear 223 to be eccentrically engaged with the internal gear 225 and roll the external gear 223 while maintaining this meshing state). .

  A striker 239 that can press the outer ends of the wedge-shaped members 233 and 235 is formed on the rotating shaft 231. The striker 239 presses the outer ends of the wedge-shaped member 233 or the wedge-shaped member 235 against the urging force of the spring 237. In this direction, both the wedge-shaped member 233 and the wedge-shaped member 235 can be moved together (corresponding to the rotation of the link in the planetary gear train).

  The ring 243 is a ring for preventing the rotation shaft 231 from coming off, and the bush 245 is fitted into a through hole of the internal gear 225 so that the rotation shaft 231 rotates smoothly.

  In the reclining unit 221, in the normal state, a force in the direction of driving the wedge is applied to the wedge-shaped members 233 and 235 by the spring 237. Here, even if a rotational force is applied to the external gear 223 from the upper arm side, the wedge-shaped members 233 and 235 cannot be moved and the external gear 223 does not rotate, so the reclining unit 221 is in a locked state.

  Here, for example, when rotational torque in the direction of the arrow in FIG. 8 is applied to the rotary shaft 231 from a motor (not shown), the striker 239 pushes the wedge-shaped member 235 against the urging force of the spring 237, and thus the external gear 223. The external gear 223 rotates in the same direction. Then, the wedge-shaped member 233 receiving the urging force of the spring 237 also rotates in the same direction so as to fill the gap with the external gear 223.

  By this interlocking operation, the wedge-shaped members 233 and 235 rotate in the same direction together with the rotating shaft 231. The same applies to rotation in the reverse direction. Thus, by rotating the rotary shaft 231, the angle of the backrest of the vehicle seat can be adjusted by tilting the upper arm that rotates the external gear 223.

  Also in this reclining unit 221, the external gear (first disk member) 223 is provided with a protrusion 223a, and the internal gear (second disk member) 225 is provided with a protrusion 225a.

  The upper arm attached to the reclining unit 221 has a fitting hole with the protrusion 223a of the external gear 223. Further, on the surface of the upper arm facing the external gear 223, there is provided an annular projection centering on the rotation center axis, the flat front end surface of which is in contact with the outer surface of the external gear 223. In this contact portion, the external gear 223 and the upper arm are welded. At the time of this welding, the protrusion 223a of the external gear 223 is fitted in the fitting hole. The annular protrusion is formed along a circle having a radius that does not interfere with the plurality of fitting holes by a half punching method. The same applies to the lower arm attached to the reclining unit 221.

It is a figure which shows the upper arm in the example of a form of this invention. It is a front view of the reclining unit in the example of the present invention. It is sectional drawing in CC of FIG. 2 which added the upper arm and the lower arm. It is a rear view of the reclining unit shown in FIG. FIG. 3 is a sectional view taken along a cutting line DD in FIG. 2. It is sectional drawing in the cutting line EE of FIG. It is the figure which removed the release plate of FIG. It is a disassembled perspective view which shows an example of another reclining unit. It is a disassembled perspective view which shows the conventional reclining apparatus.

Explanation of symbols

90 Reclining unit 100 Base plate (second disk member)
100a Protrusion 105-108 Guide protrusion 120 Operation shaft 130 Ratchet plate (first disk member)
130a: Protrusion 133 Internal tooth 140, 150 Pole 141, 151 External tooth 144, 154 Cam groove 170 Cam 174a, 174c, 175a, 175c Support surface 180 Release plate 201 Lower arm 202 Upper arm 201h, 202h Fitting hole 201t, 202t Annular protrusion 223 External gear (first disk member)
225 Internal gear (second disk member)

Claims (4)

The first disk member and the second disk member are stacked so as to be relatively rotatable, and an angle adjustment mechanism for adjusting a relative rotation angle between the first and second disk members is provided between the first and second disk members. A reclining unit,
An upper arm welded to the outer surface of the first disk member;
A lower arm welded to the outer surface of the second disk member;
In a reclining device having
An annular protrusion surrounding a rotation center axis of relative rotation between the first disk member and the second disk member on at least one of the facing surfaces of the first disk member and the upper arm. The flat tip surface is provided with an annular protrusion abutting against the other opposing surface, and the abutting portion is welded between the first disk member and the upper arm,
At least one of the opposing surfaces of the second disk member and the lower arm is also an annular protrusion that surrounds the rotation center axis, and a flat front end surface thereof abuts the other opposing surface. A reclining device in which an annular protrusion is provided, and the second disk member and the lower arm are welded by the contact portion. The first disk member and the second disk member are stacked so as to be relatively rotatable, and an angle adjusting mechanism for adjusting a relative rotation angle between the first and second disk members is provided between the first and second disk members, A reclining unit in which a plurality of protrusions are disposed on the outer surfaces of the first and second disk members so as to surround the rotation center axis of the relative rotation,
An upper arm welded to the first disc member in a state where a fitting hole with the projection of the first disc member is drilled, and the projection of the first disc member is fitted into the fitting hole;
A lower arm welded to the second disk member in a state in which a fitting hole with the protrusion of the second disk member is formed, and the protrusion of the second disk member is inserted into the fitting hole;
In a reclining device having
An annular protrusion surrounding a rotation center axis of relative rotation between the first disk member and the second disk member on at least one of the facing surfaces of the first disk member and the upper arm. The flat tip surface is provided with an annular protrusion abutting against the other opposing surface, and the abutting portion is welded between the first disk member and the upper arm,
At least one of the opposing surfaces of the second disk member and the lower arm is also an annular protrusion that surrounds the rotation center axis, and a flat front end surface thereof abuts the other opposing surface. A reclining device in which an annular protrusion is provided, and the second disk member and the lower arm are welded by the contact portion.   2. The annular projection is formed on the upper arm and the lower arm by a half punching method, and the annular projection is not formed on the first and second disk members. The reclining device according to 2.   The outer surfaces of the first and second disk members are each provided with a plurality of protrusions on one circle centered on the rotation center axis, and the annular shape is formed on the upper arm and the lower arm. The protrusion is a circle with a radius that does not interfere with the fitting hole with the rotation center axis as a center, and is formed by a half punching method along a circle with a radius that surrounds the fitting hole inside. The reclining device according to claim 2.

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