JP2011087843A - Reclining mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide reclining mechanism which realizes miniaturization and does not make a hand and so on of an operator touch a member which regulates the relative turning of an internal gear and an external gear within a definite range. <P>SOLUTION: A plate cover 26 is fixed on an internal gear 24 in order to regulate the axial movement of an external gear 23 which engages with an internal tooth 24a by an external tooth 23a. Also, a projection part 23e which projects from a side surface near the external tooth 23a to a plate cover side is formed on the external gear 23. A stopper part 26a which regulates the relative turning within a definite range by abutting on the projection part 23e at a given relative turning position when the external gear 23 and the internal gear 24 turn relatively is formed on the plate cover 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seat reclining device that tiltably holds a seat back with respect to a seat cushion.

  2. Description of the Related Art Conventionally, a reclining device disclosed in Patent Document 1 is known as a seat reclining device that tiltably holds a seat back with respect to a seat cushion. The reclining device is configured such that the external teeth of the external gear welded to the lower arm and the internal teeth of the internal gear welded to the upper arm are fitted coaxially and rotatably. In addition, a recess is formed in the opposing surface of the external gear and the internal gear so that a substantially arc-shaped space is formed on the opposing surface of the external gear, and the opposing surface of the internal gear protrudes into the recess. Protrusions are formed. When the external gear and the internal gear rotate relative to each other, the convex portion of the internal gear contacts the side wall of the concave portion of the external gear, thereby restricting the rotation of the internal gear within a certain range. Therefore, the adjustment range of the inclination angle of the seat back is regulated.

Japanese Patent No. 3946948

  By the way, in the reclining device for which miniaturization is desired, the configuration in which the adjustment range of the inclination angle of the seat back is regulated by the contact between the convex portion of the internal gear and the concave portion of the external gear as described above is simply When the reclining device is downsized, the contact position of the convex portion and the concave portion moves to the rotation center side. Therefore, the force generated at the time of rotation that acts on the convex part and the concave part becomes larger than the conventional one, and when the convex part repeatedly contacts the side wall of the concave part, the contact part is deformed or damaged. There's a problem.

  Further, when changing the regulation range of the inclination angle of the seat back, it is necessary to change at least one of the convex position of the internal gear and the concave position of the external gear according to a desired regulation range, There is also a problem that it is difficult to standardize expensive internal gears and external gears.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a reclining device that can realize downsizing and standardization of internal gears and external gears. .

  In order to achieve the above object, the reclining device according to claim 1 is a seat reclining device that tiltably holds the seat back with respect to the seat cushion, and includes any one of the seat cushion and the seat back. A first frame fixed to one of the first frame, a second frame fixed to the other of the seat cushion and the seat back, an external gear connected to the first frame and having external teeth formed on an outer peripheral surface thereof; An internal gear coupled to the second frame and capable of meshing with the external teeth and having internal teeth having a larger number of teeth than the external teeth, and the external gear meshed with the internal teeth by the external teeth A restricting member fixed to the internal gear to restrict the movement of the shaft in the axial direction, a coaxial member and a rotatable fitting with the external gear, and the external gear and the A rotation shaft that revolves one of the toothed gears around the other gear shaft, and the external gear has a protruding portion that protrudes from a side surface near the external teeth toward the regulating member, The restricting member is formed with a stopper portion that restricts the relative rotation within a certain range by contacting the protruding portion at a predetermined relative rotation position when the external gear and the internal gear rotate relative to each other. It is characterized by being.

  In the invention of claim 1, the restricting member is fixed to the internal gear in order to restrict the movement of the external gear engaged with the internal teeth by the external teeth in the axial direction. The external gear is formed with a protrusion that protrudes from the side surface near the external teeth toward the regulating member, and the regulating member has a predetermined relative rotation when the external gear and the internal gear rotate relative to each other. A stopper portion that restricts the relative rotation within a certain range by contacting the protruding portion at the moving position is formed.

Thus, when the relative rotation is restricted, the protrusion provided on the side surface in the vicinity of the external teeth comes into contact with the stopper portion of the restriction member. Even when downsizing is performed, it is possible to suppress the force generated at the time of rotation that acts on the protruding portion and the stopper portion. Further, when changing the restriction range of the inclination angle of the seat back, it can be dealt with only by changing the position of the stopper portion of the restriction member, etc., so standardization of external gears and internal gears which are expensive members is aimed at. be able to.
Therefore, the reclining device is a reclining device that achieves downsizing of the reclining device and prevents the operator's hand from touching a member that restricts the relative rotation of the internal gear and the external gear within a certain range. And standardization of external gears can be realized.

It is a side view which shows notionally an example of vehicle seat 10 carrying reclining device 20 of the present invention. 2 is a cross-sectional view of the reclining device 20. FIG. It is the side view which looked at the reclining device 20 from the 1st flame | frame 21 side. 3 is an exploded perspective view of the reclining device 20. FIG.

Hereinafter, an embodiment of a vehicle seat 10 equipped with a reclining device 20 according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, a vehicle seat 10 equipped with a reclining device 20 of the present invention includes a seat cushion 11 that receives a seated portion of the seated person, and a tiltable relative to the seat cushion 11, and the back part of the seated person. And a seat back 12 for receiving.

  The first frame 21 and the second frame 22 of the reclining device 20 in which the seat frame 11a serving as the skeleton of the seat cushion 11 and the back frame 12a serving as the skeleton of the seat back 12 are installed at the end of the seat frame 11a. The seat back 12 can be tilted with respect to the seat cushion 11 according to the rotational drive of a tilting motor (not shown) provided in the reclining device 20.

  As shown in FIGS. 2 to 4, the reclining device 20 includes an external gear 23, an internal gear 24, a rotating shaft 25, a plate cover 26, a bush 27, and a connecting member 28 in addition to both the frames 21 and 22 described above. A pair of wedge-shaped members 31 and 32, a spring 29, and a lid member 30 are provided. In FIGS. 3 and 4, illustration of both frames 21 and 22 is omitted for convenience of explanation.

  The external gear 23 is formed in a substantially annular shape, and external teeth 23a are formed on the outer peripheral surface thereof. Further, the external gear 23 is formed with a first cylindrical portion 23c and a second cylindrical portion 23d that protrude from the vicinity of the central through hole 23b in different directions coaxially. Further, the external gear 23 has two protrusions 23e protruding from the side surface in the vicinity of the external teeth 23a, that is, from the side surface at a position away from the rotation center, and is symmetric about the rotation axis, and the first cylindrical portion 23c. (See FIG. 3). The external gear 23 can correspond to an example of the “external gear” recited in the claims, and the protrusion 23e corresponds to an example of the “projection” recited in the claims. It is possible.

  The internal gear 24 is formed in a substantially annular shape, and an internal tooth 24a is formed on the outer edge of one side surface thereof. The internal teeth 24a can be meshed with the external teeth 23a and are formed to have a larger number of teeth than the external teeth 23a. Further, on the other side surface of the internal gear 24, three engaging protrusions 24 c for engaging the internal gear 24 with the second frame 22 around the central through hole 24 b, and the internal gear 24 Are welded and fixed to the second frame 22 with three welding projections 24d at equal intervals in the circumferential direction.

  The rotary shaft 25 is coaxial with the second cylindrical portion 23d of the external gear 23 and is formed to be rotatably fitted. The rotary shaft 25 is rotated at a predetermined reduction ratio in accordance with the rotational drive of the tilting motor when the seat back 12 is tilted with respect to the seat cushion 11. Serrations are formed for connecting rotating members that rotate according to the rotational drive of the tilting motor.

  The plate cover 26 is formed by making a metal plate into a substantially disc shape, and plays a role of regulating the axial movement of the external gear 23 meshed with the internal teeth 24a by the external teeth 23a. It is fixed to the outer edge of one side of the gear 24 by welding or the like. Two stopper portions 26 a are formed on the inner edge of the plate cover 26 so as to protrude inward, and at least one of the stopper portions 26 a rotates relative to the internal gear 24. The relative rotation is restricted by coming into contact with the protrusion 23 e of the external gear 23. That is, both the stopper portions 26a are set and provided so that their shapes restrict the relative rotation of both gears 23 and 24 within a certain range. The plate cover 26 can correspond to an example of a “restricting member” described in the claims, and the stopper portion 26a can correspond to an example of a “stopper portion” described in the claims. Is.

  A cylindrical bush 27 having a small friction coefficient is fitted into the through-hole 24b of the internal gear 24, which has excellent wear resistance and reduces the frictional force of the contact portion of the connecting member 28 described below. A connecting member 28 and a pair of wedge-shaped members 31 and 32 are inserted between the inner peripheral surface and the outer peripheral surface of the second cylindrical portion 23d of the external gear 23 so as to be in contact with both.

  The connecting member 28 and the pair of wedge-shaped members 31, 32 are disposed between the inner peripheral surface of the bush 27 and the outer peripheral surface of the second cylindrical portion 23 d, so that the internal gear 24 with respect to the external gear 23. And the inner teeth 24a are meshed with the outer teeth 23a. The rotary shaft 25 fitted in the central through hole 23b of the external gear 23 is engaged with the external teeth 23a and the internal teeth 24a by the connecting member 28 and the pair of wedge-shaped members 31, 32, and the external gear 23 and Any one of the internal gears 24 can be revolved around the other gear shaft. A spring 29 is engaged with the wedge-shaped members 31, 32, and the wedge-shaped member 31 is prohibited so that relative movement between the rotary shaft 25 and the internal gear 24 is prohibited unless a rotational force is input to the rotary shaft 25. , 32 are biased by a spring 29 in a direction away from each other.

  Then, the lid member 30 formed in a substantially annular shape is engaged with the corresponding engagement protrusions 24c by a pair of engagement portions 30a provided at three positions on the outer edge, and the rotation shaft 25 is connected to the rotation shaft 25 through the central through hole. One end is projected and assembled to the internal gear 24. As a result, the connecting member 28 and the like are held in an appropriate position, and dust and dust are prevented from entering.

  Then, the first frame 21 and the first cylindrical portion 23c of the external gear 23 or the end surface of the protruding portion 23e are fixed by welding, and the second frame 22 and the welding projections 24d are engaged with the respective engagement projections 24c. By welding and fixing, the reclining device 20 shown in FIG. 2 is completed.

Next, the restriction | limiting of the relative rotation of both the gears 23 and 24 in the reclining apparatus 20 is demonstrated.
When the rotary shaft 25 rotates according to the rotational drive of the tilting motor to tilt the seat back 12 with respect to the seat cushion 11, the external gear 23 and the internal gear 24 according to the rotation of the rotary shaft 25. Rotates relative to each other, and the seat back 12 tilts with respect to the seat cushion 11.

  When the gears 23 and 24 are relatively rotated to a position corresponding to a predetermined relative rotation position, the protruding portion 23e of the external gear 23 is away from the rotation shaft with respect to the stopper portion 26a of the plate cover 26. In contact with each other, the relative rotation of both gears 23 and 24 is restricted. Thereby, the tilting of the seat back 12 with respect to the seat cushion 11 is restricted within a certain range.

  As described above, in the reclining device 20 according to this embodiment, the plate cover 26 controls the internal gear 24 to restrict the axial movement of the external gear 23 meshed with the internal teeth 24a by the external teeth 23a. It is fixed to. The external gear 23 has a protrusion 23e that protrudes from the side surface near the external tooth 23a toward the plate cover. The external gear 23 and the internal gear 24 rotate relative to the plate cover 26. When this is done, a stopper portion 26a is formed that abuts against the protrusion 23e at a predetermined relative rotation position to restrict the relative rotation within a certain range.

As a result, when the relative rotation is restricted, the protrusion 23e provided on the side surface in the vicinity of the external tooth 23a contacts the stopper portion 26a of the plate cover 26, so that the contact positions of these two parts are separated from the rotation center. As a result, even when the reclining device 20 is downsized, it is possible to suppress the force generated during the rotation that acts on the protruding portion 23e and the stopper portion 26a. In addition, since the restriction range of the inclination angle of the seat back 12 can be changed by simply changing the position of the stopper portion 26a of the plate cover 26, the external gear 23 and the internal gear, which are expensive members, are used. Standardization of 24 can be achieved.
Therefore, the reclining device 20 is a reclining device that realizes downsizing of the reclining device 20 and prevents the operator's hand from touching a member that restricts the relative rotation of the internal gear 24 and the external gear 23 within a certain range. Standardization of internal gears and external gears can be realized.

In addition, this invention is not limited to the said embodiment, You may actualize as follows, and even in that case, the effect | action and effect equivalent to the said embodiment are acquired.
(1) The number of the protruding portions 23e of the external gear 23 and the stopper portions 26a of the plate cover 26 are not limited to two, but may be three or more. Moreover, you may make it provide the protrusion part 23e of the external gear 23, and the stopper part 26a of the plate cover 26 one each.

(2) The first frame 21 is coupled to the seat frame 11a and the second frame 22 is not coupled to the back frame 12a, and the first frame 21 is coupled to the back frame 12a and the second frame. 22 may be connected to the seat frame 11a.

(3) The first frame 21 and the second frame 22 may be part of the seat frame 11a and the back frame 12a.

DESCRIPTION OF SYMBOLS 10 ... Vehicle seat 11 ... Seat cushion 12 ... Seat back 20 ... Reclining device 21 ... 1st frame 22 ... 2nd frame 23 ... External gear 23a ... External tooth 23e ... Projection part 24 ... Internal gear 24a ... Internal tooth 25 ... Rotary shaft 26 ... Plate cover (regulating member)
26a ... Stopper portion 27 ... Bush 28 ... Connecting member 29 ... Spring 30 ... Lid member 31 ... Wedge-shaped member 32 ... Wedge-shaped member

Claims (1)

A seat reclining device that tiltably holds a seat back with respect to a seat cushion,
A first frame fixed to either the seat cushion or the seat back;
A second frame fixed to the other of the seat cushion and the seat back;
An external gear connected to the first frame and having external teeth formed on the outer peripheral surface;
An internal gear coupled to the second frame and capable of meshing with the external teeth and having internal teeth formed with a greater number of teeth than the external teeth;
A regulating member fixed to the internal gear to regulate axial movement of the external gear meshed with the internal tooth at the external tooth;
A rotary shaft that is coaxially and rotatably fitted to the external gear and revolves around one of the external gear and the internal gear about the other gear shaft;
The external gear has a protruding portion that protrudes from the side surface in the vicinity of the external tooth toward the regulating member.
The restricting member includes a stopper portion that restricts the relative rotation within a predetermined range by contacting the protrusion at a predetermined relative rotation position when the external gear and the internal gear rotate relative to each other. A reclining device formed.

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