JP2011207253A - Reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reclining device capable of downsizing an internal gear and an external gear.SOLUTION: The external gear 23 includes an external gear side regulation part 23e extending in the axial direction from the vicinity of a part of external teeth 23a. The internal gear 24 includes an internal gear side regulation part 24f in the vicinity of a part of internal teeth 24c. When the external gear 23 and the internal gear 24 are relatively rotated, the internal gear side regulation part abuts on the external gear side regulation part 23e at a predetermined relative rotation regulating position, thereby regulating the relative rotation within a certain range.

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.

  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 capable of realizing downsizing of an internal gear and an external gear.

  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 with a larger number of teeth than the external teeth, and coaxially and rotatably fitted to the external gear A rotation shaft that revolves one of the external gear and the internal gear about the other gear shaft, and the external gear has a part of the external teeth close to the external gear. An external tooth side restricting portion extending in the axial direction from the external gear is formed, and the internal gear has the external tooth side at a predetermined relative rotation restricting position when the external gear and the internal gear relatively rotate. An inner tooth side restricting portion that restricts the relative rotation within a certain range by contacting the restricting portion is formed in the vicinity of a part of the inner tooth.

  According to the first aspect of the present invention, the external gear is formed with an external tooth side restricting portion extending in the axial direction from the vicinity of a part of the external tooth. Further, when the external gear and the internal gear rotate relative to each other, the internal gear abuts the external gear side restricting portion at a predetermined relative rotation restricting position to restrict the relative rotation within a certain range. An internal tooth side restricting portion is formed in the vicinity of a part of the internal tooth.

For this reason, when the relative rotation is restricted, the outer tooth side restriction portion and the inner tooth side restriction portion are in contact with each other in the vicinity of the pitch circle, so that the contact positions of both restriction portions are separated from the rotation center. . Thereby, when attempting to reduce the diameter of the internal gear and the external gear, the force acting on both restriction portions at the time of restriction is compared to the case where the position of the part that contacts at the time of restriction is near the rotation center, It will be reduced.
Therefore, the internal gear and the external gear can be downsized, and the reclining device can be downsized.

It is a side view which shows notionally an example of the vehicle seat carrying the reclining apparatus of this invention. It is sectional drawing of a reclining apparatus. It is a disassembled perspective view of a reclining apparatus. It is explanatory drawing which shows the detailed structure of an external gear. It is explanatory drawing which shows the detailed structure of an internal gear. It is explanatory drawing for demonstrating the relative rotation control state in an external gear and an internal gear.

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. FIG. 1 is a side view conceptually showing an example of a vehicle seat 10 equipped with a reclining device 20 of the present invention.
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 can tilt with respect to the seat cushion 11 and is a 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. And so on. The seat back 12 can tilt with respect to the seat cushion 11 in accordance with the rotational drive of a tilting motor (not shown) provided in the reclining device 20.

  Next, the configuration of the reclining device 20 will be described with reference to FIGS. FIG. 2 is a cross-sectional view of the reclining device 20. FIG. 3 is an exploded perspective view of the reclining device 20. 4A and 4B are explanatory views showing the detailed structure of the external gear 23, FIG. 4A is a cross-sectional view of the external gear 23, and FIG. 4B shows the external gear 23 as an internal gear. It is the figure seen from 24 side. FIG. 5 is an explanatory view showing the structure of the internal gear 24, FIG. 5A is a cross-sectional view of the internal gear 24, and FIG. 5B shows the internal gear 24 as an external gear 23. It is the figure seen from the side.

  As shown in FIGS. 2 and 3, 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, 32, a spring 29, and a shaft cover 30 are provided. In FIG. 3, illustration of both frames 21 and 22 is omitted for convenience of explanation.

  As shown in FIGS. 4A and 4B, the external gear 23 is formed in a substantially annular shape centering on the through hole 23b, and external teeth 23a are formed on the outer peripheral surface thereof. The external gear 23 is formed such that a boss portion 23c protrudes from a central portion of one side surface, and four substantially arc-shaped protruding portions 23d protrude from the other side surface. Further, in the external gear 23, the external tooth side restricting portion 23e extends in the axial direction from a part of the external teeth 23a, specifically, from two adjacent teeth of the external teeth 23a. It is formed symmetrically at two places. That is, each external tooth 23a is formed such that only two teeth corresponding to both external tooth side restricting portions 23e are longer in the axial direction than the other teeth. In the present embodiment, the external tooth side restricting portion 23e is formed symmetrically at two locations in consideration of the assembly workability of the external gear 23 and the internal gear 24, but is provided only at one location. May be.

  As shown in FIGS. 5 (A) and 5 (B), the internal gear 24 is formed with a cylindrical portion 24a in which the internal teeth 24c are formed on the inner peripheral surface and a boss portion 24e centering on the through hole 24d. Side plate part 24b. The inner teeth 24c are formed so as to have more teeth than the outer teeth 23a so as to be eccentrically meshed with the outer teeth 23a. Specifically, for example, when the number of teeth of the external teeth 23a is set to 32, the number of teeth of the internal teeth 24c is set to 33.

  Further, the inner teeth 24c are set so that the width (length in the axial direction) is longer than the width of the outer teeth 23a, and the portions on the side plate portion 24b side of the outer teeth 23 and the inner gear 24 are arranged. It is formed so as not to mesh with the external teeth 23a when meshing. Two internal tooth restricting portions 24f are provided at predetermined positions so as to fill a space between two adjacent teeth among the portions on the side plate portion 24b side of the internal teeth 24c. The internal tooth side restricting portion 24f is provided in the vicinity of a part of the internal teeth 24c, and the external tooth side restricting portion at a predetermined relative rotation restricting position when the external gear 23 and the internal gear 24 relatively rotate. It plays a role of restricting the relative rotation within a certain range by abutting on 23e. Here, the both internal tooth side restricting portions 24f are provided at positions shifted by a predetermined angle in the clockwise direction and the counterclockwise direction with respect to the predetermined reference position. In the present embodiment, the predetermined angle is set to about 40 degrees, for example. Further, the side plate portion 24b is provided with a columnar engagement projection 24g and an arc-shaped welding projection 24h for fixing the internal gear 24 to the second frame 22 via the shaft cover 30. .

  The rotating shaft 25 is coaxial with the boss portion 23c 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 the 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 24c by the external teeth 23a. The end of the cylindrical portion 24a of the gear 24 is fixed by welding or the like.

  A cylindrical bush 27 having a small friction coefficient is fitted into the through-hole 24d of the internal gear 24, which has excellent wear resistance and reduces the contact portion friction force 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 boss 23c 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 arranged between the inner peripheral surface of the bush 27 and the outer peripheral surface of the boss portion 23 c, thereby decentering the internal gear 24 with respect to the external gear 23. The inner teeth 24c are engaged with the outer teeth 23a. The rotary shaft 25 fitted in the through hole 23b of the external gear 23 is engaged with the external teeth 23a and the internal teeth 24c by the connecting member 28 and the pair of wedge-shaped members 31 and 32. Any one of the tooth gears 24 can be revolved around the other gear shaft. Both engaging end portions 29a of the spring 29 are engaged with the through holes 31a and 32a of the wedge-shaped members 31 and 32, respectively, and unless the rotational force is input to the rotational shaft 25, the rotational shaft 25 and the internal gear. The wedge-shaped members 31 and 32 are biased by the spring 29 so as to inhibit relative movement with the spring 24.

  Then, the shaft cover 30 formed in a substantially annular shape is inserted into the engagement protrusions 24g and the welding protrusions 24h of the internal gear 24 through the two openings 30a that open in an arc shape, so that the internal gear 24 Assemble to. Thereby, the rotating shaft 25, the connecting member 28, and the like are held at appropriate positions, and dust and dust are prevented from entering the meshing portion and the like.

  Then, the first frame 21 and the projections 23d of the external gear 23 are fixed by welding, and the second frame 22 and the welding protrusions 24h of the internal gear 24 are fixed by welding, so that FIG. The shown reclining device 20 is completed.

  Next, the restriction | limiting of the relative rotation of both the gears 23 and 24 in the reclining apparatus 20 is demonstrated. FIG. 6 is an explanatory diagram for explaining a relative rotation restriction state in the external gear 23 and the internal gear 24, FIG. 6 (A) shows a state before restriction, and FIG. Indicates the time state. FIG. 6 corresponds to a cross-sectional view taken along a line 6-6 shown in FIG.

  When the rotary shaft 25 rotates in accordance with the rotational drive of the tilting motor to tilt the seat back 12 with respect to the seat cushion 11, the restriction by the wedge-shaped members 31 and 32 is released, and According to the rotation, the external gear 23 and the internal gear 24 rotate relative to each other, and the seat back 12 tilts with respect to the seat cushion 11.

  In response to the rotation of the rotary shaft 25, the external gear 23 rotates relative to the internal gear 24 counterclockwise from the rotation reference position shown in FIG. ), The external tooth side restricting portion 23e of the external gear 23 is pitched with respect to the internal tooth restricting portion 24f of the internal gear 24. Abutting in the vicinity of the circle, the relative rotation of both gears 23 and 24 is restricted. Further, the external gear 23 rotates relative to the internal gear 24 in the clockwise direction from the rotation reference position shown in FIG. 6A and corresponds to the other predetermined relative rotation restriction position. Even in the case of relative rotation to the position, the external tooth side restricting portion 23e of the external gear 23 abuts on the internal tooth side restricting portion 24f of the internal gear 24 in the vicinity of the pitch circle, and the both gears 23, 24 Relative rotation will be 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 the present embodiment, the external gear 23 is formed with the external tooth side restricting portion 23e extending in the axial direction from the vicinity of a part of the external tooth 23a. Further, when the external gear 23 and the internal gear 24 rotate relative to each other, the internal gear 24 abuts the external gear side restricting portion 23e at a predetermined relative rotation restricting position so that the relative rotation is within a certain range. An inner tooth side restricting portion 24f for restricting inward is formed in the vicinity of a part of the inner tooth 24c.

For this reason, when the relative rotation is restricted, the outer tooth side restriction portion 23e and the inner tooth side restriction portion 24f are in contact with each other in the vicinity of the pitch circle. Therefore, the contact positions of both the restriction portions 23e and 24f are the rotation center. Will leave. As a result, when reducing the diameters of the internal gear 24 and the external gear 23, the force acting on both the restricting portions 23e and 24f at the time of restriction is when the position of the part that contacts at the time of restriction is near the center of rotation. It will be reduced compared with.
Therefore, the internal gear 24 and the external gear 23 can be downsized, and the reclining device 20 can be downsized.

In addition, this invention is not limited to the said embodiment, You may actualize as follows, and even in that case, an effect | action and effect equivalent to the said embodiment are acquired.
(1) The external tooth side restricting portion 23e is not limited to be formed so as to extend in the axial direction from two adjacent teeth of the external teeth 23a, but with respect to a portion on the side plate portion 24b side of the internal teeth 24c. The outer teeth 23a may be formed so as to extend in the axial direction from the vicinity of a part of the outer teeth 23a so as not to come into contact except for the inner tooth side regulating portion 24f. Further, the inner tooth side restricting portion 24f is not limited to be formed so as to fill in between two adjacent teeth in the portion on the side plate portion 24b side, but the outer tooth side at the predetermined relative rotation restricting position. It may be formed in the vicinity of a part of the inner teeth 24c so as to contact the restricting portion 23e.

(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 ... External tooth side control part 24 ... Internal gear 24c ... Internal teeth 24f ... Internal tooth side restricting portion 25 ... Rotary shaft 26 ... Plate cover 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 with a larger number of teeth than the external teeth;
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;
In the external gear, an external tooth side restricting portion extending in the axial direction from the vicinity of a part of the external tooth is formed,
When the external gear and the internal gear rotate relative to each other, the internal gear contacts the external gear side restricting portion at a predetermined relative rotation restricting position so that the relative rotation is within a certain range. A reclining device, wherein an inner tooth side restricting portion for restriction is formed in the vicinity of a part of the inner tooth.

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