JP6354984B2 - Vehicle seat reclining device - Google Patents

Description

  The present invention relates to a vehicle seat reclining device for adjusting an inclination angle of a seat back with respect to a seat cushion.

  Conventionally, as such a vehicle seat reclining device, for example, a device described in Patent Document 1 is known. The vehicle seat reclining device includes an external gear fixed to one of the seat cushion and the seat back so as to be positioned at the center of tilting of the seat back, and an external tooth engaged with the external teeth of the external gear. A pair of wedge-shaped members that have a large number of internal teeth, and that include a seat cushion and an internal gear fixed to the other of the seat back, and transmit torque between the external gear and the internal gear by a wedge action An urging means for urging the pair of wedge-shaped members in a wedge driving direction for restricting the relative movement of the external gear and the internal gear, while causing one of the external gear and the internal gear to move eccentrically with respect to the other. In a reclining device provided with a wedge release member that changes the meshing position of an external tooth and an internal tooth, the end of the pair of wedge-shaped members that is pressed by each wedge release member is along the rotation axis of the wedge release member Position in the direction The outer cylindrical surface and the inner cylindrical surface are both side surfaces, and the wall thickness is smaller than the wall thickness defined by the normal thick portion having the contact surface of the wedge release member and the extended virtual surface of the outer cylindrical surface and the inner cylindrical surface. And a lubricant inflow portion.

  In Cited Document 1, a lubricant inflow portion thinner than the wall thickness defined by the outer virtual surface of the wedge-shaped member and the extended virtual surface of the inner cylindrical surface is formed as part of the direction along the rotation axis of the wedge release member. Then, the remaining portion is a notch, and the contact surface of the wedge release member is formed at a position facing the notch, so that the smoothness of sliding can be improved by the lubricant inflow portion, and the wedge-shaped member can be molded. It becomes easy. That is, by thinning a part of one end of the wedge-shaped member, a lubricant inflow portion is provided to easily guide the lubricant to the sliding surface, and the smoothness of sliding of the wedge-shaped member is improved.

JP 2009-165647 A

  However, in the vehicle seat reclining device described in the cited document 1, since the lubricant inflow portion is provided only at a part of the end of the wedge-shaped member, the lubricant such as grease is applied to the entire sliding surface during the rotational sliding. There was a problem that could not be incorporated.

  In order to solve such a problem, the present invention can stably take in the lubricant into the rotating sliding portion and the sliding surface during operation of the seat reclining device, suppress wear of the sliding portion, An object of the present invention is to provide a vehicle seat reclining device that can prevent the generation of abnormal noise.

In order to solve the above problems, the present invention provides:
A first member having an internal gear provided on either the seat cushion or the seat back of the vehicle seat;
A second member provided on either the seat cushion or the seat back of the vehicle seat and having an external gear that has at least one tooth less than the internal gear and meshes with the internal gear;
It is interposed between the first member and the second member, and frictionally engages the first member and the second member to suppress the relative movement of both members. A pair of wedge members allowing relative movement of the members;
A spring disposed between the pair of wedge members and constantly biasing the wedge member in a direction of frictional engagement with the first member and the second member;
One of the pair of wedge members is moved against the spring force of the spring in a direction to release the frictional engagement, and the pair of wedge members are moved through the spring to the first member and the second member. A drive shaft provided with a drive unit that rotates around the rotation axis of the member;
The first member, the second member, and the pair of wedge members are disposed so as to be relatively rotatable, and abut against one of the pair of wedge members via the drive shaft when the drive unit rotates. A cam member that rotates together with the pair of wedge members with respect to the first member and the second member,
The at least one end portion of the rotating direction of the rubbing surface between the first member and the second member of the pair of wedge members, a pair of projecting the rotational direction from both side ends along the axis of rotation of the pair of wedge members with protrusions are formed, with a recess formed by being surrounded on opposite sides of the pair of protruding portions,
The concave portion is provided on both the rubbing surface with the first member and the rubbing surface with the second member, and is configured to communicate with each other .

  According to the present invention, at least one end portion of the pair of wedge members in the rotational direction on the sliding surface with the first member and the second member, both side ends along the rotation axis of the pair of wedge members rotate more than the center portion. Since the concave portion configured to protrude in the direction is provided, the lubricant is stably taken into the rotating sliding portion during operation of the seat reclining device (to flow out to the side of the wedge member (the side perpendicular to the rotating direction)). By collecting the lubricant to be recovered in the central part), it is possible to suppress wear of the sliding part and to prevent the deterioration of operation and the generation of abnormal noise.

  Since the lubricant is accumulated in the recess provided in the wedge member, it is possible to prevent the lubricant from running out. Further, the lubricating oil can be effectively supplied to the entire sliding surface.

It is a side view of the vehicle seat which attached the seat reclining device for vehicles concerning the embodiment of the present invention. FIG. 2 is an axial sectional view of the vehicle seat reclining device according to the embodiment of the present invention, taken along line AA in FIG. 1. 1 is an exploded perspective view of a vehicle seat reclining device according to an embodiment of the present invention. It is a perspective view showing a wedge member of a seat reclining device for vehicles concerning an embodiment of the present invention. It is a model axial section showing an example of a crevice formed in an end of a wedge member. It is a schematic axial cross section which shows the other examples of the recessed part formed in the edge part of a wedge member. It is a schematic axial cross section which shows the other examples of the recessed part formed in the edge part of a wedge member. It is a fragmentary perspective view which shows the modification of embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is a side view of a vehicle seat to which a vehicle seat reclining device according to an embodiment of the present invention is attached. 1, the vehicle seat reclining device 10 (hereinafter referred to as “seat reclining device”) adjusts the inclination angle of the seat back 20 with respect to the seat cushion 30. In this embodiment, the vehicle Seat reclining devices 10 having a substantially symmetrical structure are respectively attached to the left and right sides of the seat 3, and both the seat reclining devices 10 are connected by an interlocking shaft 27 described later.

  A drive device 28 (see FIG. 2) having an electric motor (not shown) is attached to one of the seat reclining devices 10, and a drive device is not provided to the other. The vehicle seat reclining device 10 provided with the driving device 28 and the seat reclining device 10 not provided with the driving device 28 operate in conjunction with each other via an interlocking shaft 27 (see FIG. 2). Hereinafter, the structure and operation will be described focusing on the seat reclining device 10 having the driving device 28.

  As shown in FIGS. 1 and 2, the seat reclining device 10 is fixed to the seat cushion 30 via the attachment plate 11 by inserting a bottle into the attachment hole 11 a of the attachment plate 11. Similarly, the seat reclining device 10 is fixed to the seat back 20 via a plate (not shown).

  FIG. 2 is an axial sectional view of the vehicle seat reclining device according to the embodiment of the present invention. The vehicle seat 3 is not shown. One seat reclining device 10 provided at the tilting point of the seat back 20 of the vehicle seat 3 is provided on each of the left and right sides of the vehicle seat 3. However, the drive device 28 having an electric motor is provided on either the left or right side.

  As shown in FIG. 2, the seat reclining device 10 includes a first member 12 having an internal gear 12 a, a second member 22 having an external gear 22 a meshing with the internal gear 12, and the first member 12 and the second member 22. In order to restrict the separation of the first member 12 and the second member 22, a pressing ring member 23 is provided to sandwich the first member 12 and the second member 22.

  The seat reclining device 10 provided as a pair of left and right seats 3 is driven by a driving device 28. As shown in FIG. 2, a cam member 26 is interposed in the shaft hole 14 of the first member 12. A drive shaft (not shown) is rotatably inserted into the cam member 26. At this time, since the cross-sectional shape of the outer periphery of the drive shaft and the cross-sectional shape of the inner periphery of the shaft portion 26a of the cam member 26 are hexagonal, they do not rotate relatively. A pair of wedge members 35 a and 35 b are interposed between the first member 12 and the second member 22 and around the cam member 26. The pair of wedge members 35a and 35b are frictionally engaged with the first member 12 and the second member 22 on the friction surface with the first member 12 and the second member 22, and suppress relative movement of both members. The frictional engagement is released to allow relative movement of both members.

  The cam member 26 is disposed so as to be relatively rotatable between the first member 12 and the pair of wedge members 35a and 35b, and abuts against one of the pair of wedge members 35a and 35b when the driving device 28 rotates. The first member 12 rotates with the pair of wedge members 35a and 35b.

The drive shaft is provided with a serration portion (not shown), and one end of an interlocking shaft 27 constituting the seat reclining device 10 is fitted to the serration portion. Therefore, when the motor is rotated by the switch operation, the rotation of the drive shaft is transmitted to the interlocking shaft 27 as it is through the reduction gear. Accordingly, the rotation of the drive shaft can be transmitted to the other seat reclining device 10 via the interlocking shaft 27, and the seat reclining devices 10 on both sides of the vehicle seat 3 can be operated almost simultaneously.

Protrusions 31 projecting in the axial direction are formed at the thick end portions 38 and 39 of the pair (two) wedge members 35a and 35b. In addition, when the drive shaft rotates in one direction, the end surface 26c of the notched portion of the cam member 26 contacts the end surface 33 of one of the protrusions 31 of the wedge members 35a and 35b to resist the force of the spring 24. Then, the wedge members 35a and 35b are moved in the circumferential direction so that the gap 34 between the wedge members 35a and 35b becomes narrow.

When the motor rotates reversely by the switch operation, when the drive shaft rotates in the reverse direction, the other wedge members 35a and 35b are moved, and similarly, the gap 34 is moved so as to be narrowed. Projections 31 are formed at the end portions 38 and 39 of the wedge members 35a and 35b, and the projections 31 abut on the cam member 26 provided on the drive shaft. The disc portion 26b of the cam member 26 has an outer diameter large enough to cover the end surfaces of the wedge members 35a and 35b other than the projections 31 of the end portions 38 and 39 . For this reason, even when an excessive load is applied from the seat back 20 and an excessive load is applied to the wedge members 35a and 35b, the wedge members 35a and 35b can be prevented from coming off from a predetermined position.

FIG. 3 is an exploded perspective view of the vehicle seat reclining device according to the embodiment of the present invention. The seat reclining device 10 includes a first member 12 having an internal gear 12a, a second member 22 having an external gear 22a meshing with the internal gear 12a, and the first member 12 and the second member 22 being separated in the axial direction. The retaining ring member 23 to be regulated, the pair of wedge members 35a and 35b fitted to the burring portion 13 of the first member 12, the spring 24 arranged to separate the wedge members 35a and 35b, and the first member 12 The cam member 26 is provided.

Next, the angle adjustment operation of the seat reclining device 10 will be described. When the drive shaft is not rotating, the wedge members 35a and 35b are biased by the spring 24 in a direction away from each other. When the wedge members 35a and 35b are separated from each other by the spring 24, the inner peripheral surfaces 37 of the wedge members 35a and 35b are strongly pressed by the cylindrical burring portion 13 of the first member 12 to act as wedge surfaces.

  A frictional force acts between the wedge members 35a and 35b and the burring portion 13, and the rotation of the wedge members 35a and 35b is restricted. Further, since the wedge members 35 a and 35 b are pressed radially outward by the burring portion 13, the outer peripheral surface 36 is strongly pressed against the inner peripheral surface of the center hole 22 b of the second member 22. As a result, the outer peripheral surface 36 acts as a friction surface and frictionally engages with the second member 22. As a result, the rotation with respect to the wedge members 35a and 35b and the first member 12 is restricted. Due to this rotation restriction, the engagement of the second member 22 and the first member 12 is held at a predetermined position.

  The first member 12 is provided on one of the seat cushion 30 and the seat back 20 of the vehicle seat 3, and the second member 22 is provided on the other of the seat cushion 30 and the seat back 20 of the vehicle seat. . The external gear 22a that meshes with the internal gear 12a has a number of teeth that is at least one smaller than that of the internal gear 12a, and meshes with each other while being eccentric.

  The internal gear 12a and the external gear 22a are held in mesh by a pair of wedge members 35a and 35b. The pair of wedge members 35 a and 35 b are disposed in a radial gap between the center hole 22 b of the second member 22 and the shaft portion 26 a of the cam member 26.

As shown in FIG. 4, each of the pair of wedge members 35a and 35b has a wedge shape, and the protruding portion 31 protruding in the axial direction as described above is formed at one end portion 38 and 39 in the circumferential direction. Is provided. The other end 48 is not provided with the protrusion 31. The radial thickness of the wedge members 35a and 35b is maximum at the thick end portions 38 and 39 provided with the protrusions, and decreases toward the other thin end portion 48. As a result, the entire wedge members 35a and 35b have a wedge shape. The end portion 24 a of the spring 24 is engaged with the stepped portion 43 provided adjacent to the protruding portion 31.

The outer peripheral surface 36 of each of the wedge members 35a and 35b is in slidable contact with the center hole 22b of the second member 22, and the inner peripheral surface 37 is in slidable contact with the shaft portion 26a of the cam member 26. . A gap 34 is provided between the pair of wedge members 35a and 35b. In this gap 34, a spring 24 that acts to widen the gap 34 is disposed. One end 24a of the spring 24 is locked to the thick end 38 of one wedge member 35a, and the other end 24b is locked to the thick end 39 of the other wedge member 35b.

The wedge members 35a and 35b extend in the circumferential direction toward the opposed thick end portions 39 and 38, respectively, and both side ends projecting in the rotational direction from the central portion along the rotational axis of the wedge member are projected portions 40. It is formed as. The protrusions 40 are provided one by one so as to face each other on both edges (both sides) in the axial direction of the wedge members 35a and 35b. A recess 41 is formed between the protrusions 40.

  The outer peripheral surfaces 36 of the wedge members 35a and 35b have a function of supplying a lubricant such as grease to the rotating sliding portion of the rotating member. In the conventional wedge member, the lubricant is supplied to the outer peripheral surface 36 from the end surface where the protruding portion 40 is not provided. However, in this case, the lubricant may flow out to both sides in the axial direction of the wedge member. Once the seat reclining device 10 is assembled, it is difficult to supply the lubricant from the outside. However, by providing the protruding portion 40, the concave portion 41 is formed, and the lubricant is accumulated in the concave portion 41, so that it is possible to prevent the lubricant from running out. Further, the lubricating oil can be effectively supplied to the entire sliding surface.

In the circumferential direction of the other end portion 48 of the wedge member 35a and 35b, like the ends 38 and 39, collision detection section 49 which projects in the circumferential direction is provided. Similarly to the protrusion 40, the protrusion 49 can be provided on one side or both sides in the axial direction. The recesses 42 are formed by providing the protrusions 49 at both edges in the axial direction. The recess 42 functions as a lubricant reservoir and can supply the lubricant to the outer peripheral surfaces 36 of the wedge members 35a and 35b.

  The concave portion 41 and the concave portion 42 are at least at one end in the rotational direction of the sliding surface of the pair of wedge members 35a and 35b with the first member 12 and the second member 22, along the rotation axis of the pair of wedge members 35a and 35b. Both side ends are configured to protrude in the rotational direction from the central portion. The recess 41 and the recess 42 are provided on both the rubbing surface with the first member 12 and the rubbing surface with the second member 22 and communicate with each other.

  By providing the projecting portion 40, it is possible to stably take in the grease into the rotating sliding portion of the rotating member such as the first member 12, the second member 22, and the cam member 26 during the operation of the seat reclining device 10. . The protruding portion 40 can prevent the supplied grease from flowing out in the axial direction, suppress wear of the sliding portion, and prevent operation deterioration and generation of abnormal noise.

  By providing the projecting portions 40 at both edge portions in the axial direction of the end surfaces of the wedge members 35a and 35b, a space surrounded by the projecting portions 40 is formed, and the entire sliding surface can be stably taken in without missing the lubricant. it can. By providing the protruding portions 40 at both axial ends of the end surfaces of the wedge members 35a and 35b, the concave portion 41 surrounded by the two protruding portions 40 serves as a lubricant reservoir, and escapes the lubricant. You can capture without.

The lubricant supplied from the protruding portion 40 side flows not only in the outer peripheral surface 36 but also in the direction of the inner peripheral surface 37, and lubricates the sliding portion between the cam member 26 and the first member 12 . Further, as shown in FIG. 4, by providing a curved groove 45 on the outer peripheral surface 36 of the wedge members 35 a and 35 b and a curved groove 46 on the inner peripheral surface 37, a lubricating oil reservoir is also provided on the outer peripheral surface 36 and the inner peripheral surface 37. And the sliding portion can be more effectively lubricated.

  The groove formed on the outer peripheral surface 36 may be formed as a linear groove extending in the circumferential direction. By combining the protrusion 40 with the curved groove 45 or the straight groove, the sliding portion of the seat reclining device 10 is more effectively lubricated.

  The shape of the cross section in the axial direction of the recesses 41 and 42 formed by the protrusions 40 and 49 may be trapezoidal as shown in FIG. 4, but other shapes, for example, V-shaped as shown in FIG. 5, as shown in FIG. A U-shape can be used, and a U-shape can be used as shown in FIG. The shape with a large amount of lubricant can be set. The protrusions 40 and 49 preferably have a shape capable of collecting the lubricant from the sliding interface.

6 and 7 also, the side surface 40a of the protrusion 40 constituting the inner surface of the recess 41 is formed in a tapered shape that tapers from the tip of the protrusion 40 toward the wedge members 35a and 35b. Can do. Similarly, the side surface 49a of the protrusion 49 constituting the inner surface of the recess 42 can also be formed in a tapered shape. The concave portions 41 and 42 have a tapered shape that gradually changes from the central portion of the concave portions 41 and 42 toward the protruding portions 40 that are both ends. 5 to 7, the protruding portion 40 is described, but it goes without saying that the same deformation can be applied to the protruding portion 49 and the recessed portion 42.

  FIG. 8 is a partial perspective view showing a modification of the embodiment of the present invention. In the above-described embodiment, the concave portion 41 and the concave portion 42 are provided on the entire end surface of one end portion of the wedge members 35a and 35b in the rotational direction. 8 illustrates the wedge member 35b out of the pair of wedge members 35a and 35b, the other wedge member 35a may have the same configuration. Moreover, the both end surfaces of the rotation direction of the wedge members 35a and 35b can also be made into the same structure.

The concave portions 50 are provided at two locations on the inner diameter side and the outer diameter side of the end surface 52 in the rotation direction of the wedge member 35b. The inner diameter side recess 50 opens to the end face 52, and the side end 51 surrounding the recess 50 is formed such that the axial width converges from the opening toward the curved groove 46. The bottom surface of the concave portion 50 is also formed in a tapered shape that gradually changes and slopes toward the inner peripheral surface of the wedge member 35b. The recess 50 on the outer diameter side has the same configuration.

  The protrusions 40 and 49 may be formed integrally with the wedge members 35a and 35b or may be configured separately. In the case of a separate body, for example, the wedge members 35a and 35b can be made of a material different from that of resin.

  The bottom surface of the recess formed between the protrusions 40 and 49 may have a tapered shape so that the radial thickness of the wedge member decreases toward the tip in the circumferential direction. By doing so, the lubricant can be recovered more efficiently.

  By providing the protrusions 40 and 49, the end surfaces of the wedge members 35a and 35b collect the lubricant from the sliding interface, store the recovered lubricant in the recess formed between the protrusions, and supply the lubricant to the lubrication interface. It becomes possible. Thereby, since reuse of a lubricant can be made effective, it is possible to prevent running out of lubricating oil.

3: vehicle seat, 10: vehicle seat reclining device, 12: first member, 12a: internal gear, 13: burring portion, 20: seat back, 22: second member, 22a: external gear, 24: spring , 26: cam member, 27: interlocking shaft, 28: drive device, 35a, 35b: wedge member, 30: seat cushion, 40, 49: protrusion, 41, 42, 50: recess

Claims (2)

A first member having an internal gear provided on either the seat cushion or the seat back of the vehicle seat;
A second member provided on either the seat cushion or the seat back of the vehicle seat and having an external gear that has at least one tooth less than the internal gear and meshes with the internal gear;
It is interposed between the first member and the second member, and frictionally engages the first member and the second member to suppress the relative movement of both members. A pair of wedge members allowing relative movement of the members;
A spring disposed between the pair of wedge members and constantly biasing the wedge member in a direction of frictional engagement with the first member and the second member;
One of the pair of wedge members is moved against the spring force of the spring in a direction to release the frictional engagement, and the pair of wedge members are moved through the spring to the first member and the second member. A drive shaft provided with a drive unit that rotates around the rotation axis of the member;
The first member, the second member, and the pair of wedge members are disposed so as to be relatively rotatable, and abut against one of the pair of wedge members via the drive shaft when the drive unit rotates. A cam member that rotates together with the pair of wedge members with respect to the first member and the second member,
The at least one end portion of the rotating direction of the rubbing surface between the first member and the second member of the pair of wedge members, a pair of projecting the rotational direction from both side ends along the axis of rotation of the pair of wedge members with protrusions are formed, with a recess formed by being surrounded on opposite sides of the pair of protruding portions,
The vehicle seat reclining device , wherein the recess is provided on both the rubbing surface with the first member and the rubbing surface with the second member, and is configured to communicate with each other . 2. The concave portion is configured to have a tapered shape that gradually changes and inclines so that the side surfaces of the pair of projecting portions that face each other approach each other from the tips of the pair of projecting portions toward the wedge member. The vehicle seat reclining device described in 1.

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