JP5262957B2 - Reclining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining device rendering thickness in an axial direction thinned down. <P>SOLUTION: An external gear 23 includes a projection 23e projecting from one side face 23b. An internal gear 24 includes two arch projections 24d and 24d on the other side face 24c. Both projections 24d and 24d engaging with a second frame 22 connect the internal gear 24 to the second frame 22. One side face 24b of the gear 24 includes two recesses 24f and 24f archedly recessing so as to accommodate a protrusive extent of the projection 24d in a position facing the projection 24d. The projection 23e is introduced in both recesses 24f and 24f respectively when the gear 23a engages with the gear 24a. When the gears 23 and 24 relatively rotate, the gears 23 and 24, coming in contact with the projection 23e in a predetermined relative rotation position respectively, regulate the relative rotations of the gears 23 and 24 in a predetermined range. <P>COPYRIGHT: (C)2011,JPO&amp;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 that is welded to the lower arm and the internal teeth of the internal gear that is welded to the upper arm are inscribed. 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. And, when the external gear and the internal gear are relatively rotated, by restricting the rotation of the internal gear within a certain range by the convex portion of the internal gear contacting the side wall of the concave portion of the external gear, The adjustment range of the inclination angle of the seat back is regulated.

Japanese Patent No. 3946948

  However, as described above, in order to restrict the adjustment range of the inclination angle of the seatback, the opposing surface of the external gear is substantially arranged to bring the convex portion of the internal gear into contact with the side wall of the concave portion of the external gear. An arc-shaped space is required. For this reason, since the axial length of the gear mechanism having the external gear and the internal gear is increased, there is a problem in that the axial thickness of the reclining device cannot be reduced.

  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 reducing the thickness in the axial direction.

  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, and an external gear connected to the first frame and having outer teeth formed on an outer peripheral surface thereof; An external gear provided with a convex portion protruding in the axial direction from the side surface opposite to the side connected to the first frame, and an internal tooth that can mesh with the external tooth and has a larger number of teeth than the external tooth An internal gear formed on the second frame at a projecting portion projecting in an arc from the other side facing the one side which is the side on which the internal teeth are formed. By fitting, the internal gear connected to the second frame and the external gear are coaxially and rotatably fitted, and either the external gear or the internal gear is centered on the other gear shaft. A rotating shaft that revolves, and the one side surface of the internal gear is provided with a concave portion that is recessed in an arc shape in accordance with a protruding amount of the protruding portion at a portion facing the protruding portion. The convex portion is inserted when the external teeth and the internal teeth mesh with each other, and when the external gear and the internal gear rotate relatively, the relative rotation is achieved by contacting the convex portion at a predetermined relative rotational position. It is formed so as to be regulated within a certain range.

  According to a second aspect of the present invention, in the reclining device according to the first aspect, the outer gear is provided with two convex portions symmetrically with respect to the rotation center thereof, and the inner gear has the predetermined relative According to the rotation position, two concave portions that abut against the both convex portions are provided, and two protruding portions are provided at the portions on the other side face respectively facing the concave portions.

  In the first aspect of the present invention, the external gear is provided with a convex portion protruding from the side surface opposite to the side connected to the first frame. The internal gear is provided with an arcuate protrusion on the other side facing the one side on which the internal teeth are formed, and the protrusion engages with the second frame so that the internal gear Connected to the frame. Then, on one side surface of the internal gear, a recess that is recessed in an arc shape according to the protrusion amount of the protrusion is provided at a portion facing the protrusion, and the recess engages with the external teeth and the internal teeth. When the convex portion is inserted and the external gear and the internal gear rotate relative to each other, the relative rotation of both gears is regulated within a certain range by contacting the convex portion at a predetermined relative rotational position.

  Thereby, in the internal gear, the protrusion on the other side functions as an engaging member for engaging the internal gear with the second frame, and the concave on one side is the convex of the external gear at the predetermined relative rotational position. It can function as a regulating member that abuts on the gear and regulates the relative rotation of both gears. As described above, the concave amount of the concave portion as the restricting member is set according to the protruding amount of the protruding portion that protrudes as the engaging member, thereby bringing the convex portion of the internal gear into contact with the side wall of the concave portion of the external gear. Thus, since it is not necessary to provide a space for restricting the relative rotation of both gears between the two gears, the thickness of the reclining device in the axial direction can be reduced.

  Further, in the invention of claim 2, the external gear is provided with two convex portions symmetrically with respect to the rotation center thereof, and the internal gear contacts the both convex portions according to the predetermined relative rotational position. Two of the concave portions that are in contact with each other are provided on one side surface, and two of the protruding portions are provided on a portion of the other side surface that faces the both concave portions.

  As a result, the relative rotation of the two gears is restricted by the two convex portions and the two concave portions coming into contact with each other, so that the impact applied to the convex portions and the concave portions is dispersed and the load acting on both gears is reduced. can do. In particular, both convex portions and both concave portions are formed symmetrically with respect to the center of rotation, so that not only work errors related to the assembly work of both gears are eliminated, but also the effects of heat treatment distortion during gear manufacturing, etc. Therefore, the manufacturing cost of the reclining device can be reduced as compared with the case where both the convex portions and the both concave portions are manufactured asymmetrically.

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. 3 is an exploded perspective view of the reclining device 20. FIG. It is the side view which looked at the external gearwheel 23 from the other side surface 23c side. It is the side view which looked at the internal gearwheel 24 from the one side surface 24b side.

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 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. The seat back 12 can be tilted with respect to the seat cushion 11 in accordance with an operation of an operation lever (not shown) connected to the reclining device 20.

  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 bush 26, a connecting member 27, a spring 28, and a pressing member, in addition to both the frames 21 and 22 described above. 29 and a lid member 30 are provided. In FIG. 3, the description of both frames 21 and 22 is omitted.

  As shown in FIGS. 2 to 4, the external gear 23 is formed in a substantially annular shape, and external teeth 23 a are formed on the outer peripheral surface thereof. Further, on the other side surface 23c facing the one side surface 23b which is the side surface on the first frame 21 side of the external gear 23, there are a cylindrical portion 23d that protrudes coaxially from the center portion and two convex portions 23e that protrude from the vicinity of the outer edge. Is formed. Both convex portions 23e are provided symmetrically with respect to the rotation center. A plurality of columnar protrusions 23 f for connecting the external gear 23 to the first frame 21 are provided on one side surface 23 b of the external gear 23.

  As shown in FIGS. 2, 3 and 5, the internal gear 24 is formed in a substantially annular shape, and an inner tooth 24a is formed on the outer edge of one side surface 24b 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 24c opposite to the one side surface 24b, two arc-shaped projections 24d and two columnar projections 24e for connecting the internal gear 24 to the second frame 22 have a rotation center. They are provided symmetrically with respect to the reference and projecting in the axial direction.

  In addition, the one side surface 24b of the internal gear 24 is provided with two concave portions 24f that are recessed in an arc shape in accordance with the protruding amount of both the protruding portions 24d at a portion facing both the protruding portions 24d (see FIG. 2). ). Both concave portions 24f are inserted by both convex portions 23e when the external teeth 23a and the internal teeth 24a mesh with each other, and abut against the convex portions 23e at a predetermined relative rotational position when the external gear 23 and the internal gear 24 rotate relative to each other. It is formed as follows.

  The rotating shaft 25 is coaxial with the cylindrical portion 23d of the external gear 23 and is formed so as to be rotatably fitted. The rotary shaft 25 is rotationally driven according to the operation of the operation lever when the seat back 12 is tilted with respect to the seat cushion 11, and the inner surface of the rotary shaft 25 is connected to the operation lever. Serrations are formed.

  The external gear 23 and the internal gear 24 configured as described above are connected by meshing the external teeth 23a and the internal teeth 24a so that the convex portions 23e are inserted into the corresponding concave portions 24f, respectively.

  Here, since the recesses 24f are set in accordance with the protrusions of the protrusions 24d, the relative rotation of the two gears can be achieved by bringing the protrusions of the internal gear and the recesses of the external gear into contact with each other. Since it is not necessary to provide a space for restriction between the two gears, the axial separation distance between the other side surface 23c of the external gear 23 and the other side surface 24c of the internal gear 24 at the time of meshing is reduced.

  A cylindrical bush 26 having excellent wear resistance is fitted into the inner peripheral surface 24g of the internal gear 24, and between the inner peripheral surface of the bush 26 and the outer peripheral surface of the cylindrical portion 23d of the external gear 23. The connecting member 27 is inserted so as to be in contact with both.

  The connecting member 27 is disposed between the inner peripheral surface of the bush 26 and the outer peripheral surface of the cylindrical portion 23d, thereby causing the internal gear 24 to be eccentric with respect to the external gear 23, and meshing the internal teeth 24a with the external teeth 23a. It is something to be made. The rotary shaft 25 fitted to the external gear 23 is engaged with the external teeth 23a and the internal teeth 24a by the connecting member 27, and revolves around either the external gear 23 or the internal gear 24 around the other gear shaft. Let A spring 28 is engaged with the connecting member 27, and unless the rotational force is input to the rotating shaft 25, the connecting member 27 is moved by the spring 28 so as to inhibit the relative movement between the rotating shaft 25 and the internal gear 24. It is energized.

  Then, the cylindrical pressing member 29 is fitted to the outer peripheral surface of the internal gear 24 at the outer edge in a state where the cylindrical pressing member 29 is in contact with the vicinity of the outer edge of the outer gear 23 in the vicinity of the inner edge. The external gear 23 and the internal gear 24 are urged so as to be close to each other.

  Subsequently, the lid member 30 formed in a substantially annular shape has two arcuate engagement holes 30a and two circular engagement holes 30b formed in both the projecting portions 24d and both projections 24e of the internal gear 24, respectively. It is assembled to the internal gear 24 so that one end of the rotary shaft 25 protrudes from the center through hole. Accordingly, the connecting member 27 and the like are accommodated inside the inner peripheral surface 24g of the internal gear 24.

Then, in order to connect the first frame 21 connected to the seat frame 11 a and the external gear 23, the protrusions 23 f are engaged with the engagement holes 21 a of the first frame 21, respectively. Further, in order to connect the second frame 22 connected to the back frame 12 a and the internal gear 24, both the protruding portions 24 d and both protrusions 24 e with which the lid member 30 is engaged are connected to the engagement holes 22 a of the second frame 22. Are engaged with each other.
Thereby, the reclining device 20 shown in FIG. 2 is completed.

Next, regulation of relative rotation of both gears 23 and 24 in the reclining device 20 will be described.
When the rotary shaft 25 is rotationally driven in response to the operation of the operation lever to tilt the seat back 12 with respect to the seat cushion 11, the external gear 23 and the internal gear 24 are relative to each other according to the rotational drive of the rotary shaft 25. The seat back 12 tilts with respect to the seat cushion 11 by rotating.

  When the gears 23 and 24 are relatively rotated to a position corresponding to the above-described predetermined relative rotation position, the both convex portions 23e of the external gear 23 inserted into the both concave portions 24f of the internal gear 24 are formed in the concave portions 24f. Since each abuts against the side wall, the relative rotation is restricted.

  In this way, since the relative rotation of both gears 23 and 24 is restricted by the contact between both convex portions 23e and both concave portions 24f, compared to the case where the convex portions and the concave portions provided one by one are in contact, The impact at the time of contact of the convex portion 23e and the concave portion 24f is dispersed, and the load acting on both the gears 23 and 24 is reduced.

  As described above, in the reclining device 20 according to the present embodiment, the external gear 23 is provided with the convex portion 23e protruding from the other side surface 23c. The internal gear 24 is provided with two arc-shaped protrusions 24 d on the other side surface 24 c, and the internal gear 24 is connected to the second frame 22 by engaging both the protrusions 24 d with the second frame 22. The The one side surface 24b of the internal gear 24 is provided with two concave portions 24f that are recessed in an arc shape in accordance with the protruding amount of the protruding portion 24d at a portion facing both the protruding portions 24d. When the external teeth 23a and the internal teeth 24a mesh with each other, the convex portions 23e are inserted, and when the external gear 23 and the internal gear 24 rotate relative to each other, they come into contact with the convex portions 23e at predetermined relative rotational positions, whereby both gears 23 , 24 is regulated so as to restrict the relative rotation within a certain range.

  Thereby, in the internal gear 24, both projecting portions 24d on the other side surface 24c function as engaging members for engaging the internal gear 24 with the second frame 22, and both concave portions 24f on the one side surface 24b It can function as a regulating member that abuts against both convex portions 23e of the external gear 23 at the relative rotational position and regulates the relative rotation of the gears 23 and 24. Thus, by setting the amount of depression of both recesses 24f as the restricting member according to the amount of protrusion of both protrusions 24d protruding as the engaging member, the convex portions of the internal gear and the external gear as described above are set. Since it is not necessary to provide a space for restricting the relative rotation of both gears by contacting the side walls of the recesses, the other side surface 23c of the outer gear 23 and the other side surface 24c of the inner gear 24 at the time of meshing. And the axial distance of the reclining device 20 can be reduced.

  Further, in the reclining device 20 according to the present embodiment, the external gear 23 is provided with the two convex portions 23e symmetrically with respect to the rotation center thereof, and the internal gear 24 is provided in accordance with the predetermined relative rotational position. In addition, two concave portions 24f that come into contact with both convex portions 23e are provided on one side surface 24b, and two protruding portions 24d are provided on portions of the other side surface 24c that face both the concave portions 24f.

  As a result, the relative rotation of the two gears 23 and 24 is restricted by the two convex portions 23e and the two concave portions 24f coming into contact with each other, so that the impact when the convex portions 23e and the concave portions 24f are brought into contact is dispersed. The load acting on the gears 23 and 24 can be reduced. In particular, both the convex portions 23e and both concave portions 24f are formed symmetrically with respect to the center of rotation, so that not only work errors related to the assembly work of both gears 23 and 24 are eliminated, but also heat treatment during gear manufacturing. Since the influence of distortion or the like is reduced, the manufacturing cost of the reclining device 20 can be reduced as compared with the case where both the convex portions and the both concave portions are manufactured asymmetrically.

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 protrusions 23e of the external gear 23 and the protrusions 24d and the recesses 24f of the internal gear 24 are not limited to be provided symmetrically with respect to the two rotation centers, but are more than three symmetrical with respect to the rotation center. May be provided. Further, when the load at the time of restricting the relative rotation of both gears 23 and 24 is small, the convex portion 23e of the external gear 23, the protruding portion 24d and the concave portion 24f of the internal gear 24 may be provided one by one.

(2) 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 23b ... One side surface 23c ... Other side surface 23e ... Convex part 24 ... Inside Gear 24a ... Inner teeth 24b ... One side 24c ... Other side 24d ... Protrusion 24f ... Recess 25 ... Rotating shaft

Claims (2)

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 that is connected to the first frame and has external teeth formed on an outer peripheral surface thereof, and is provided with a convex portion that protrudes in an axial direction from a side surface opposite to the side connected to the first frame. Gears,
An internal gear that is capable of meshing with the external teeth and that has internal teeth with a larger number of teeth than the external teeth, and that is opposed to one side that is the side on the side where the internal teeth are formed. An internal gear coupled to the second frame by engaging the second frame with a projecting portion projecting in an arc from
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 one side surface of the internal gear is provided with a concave portion that is recessed in an arc shape in accordance with the protruding amount of the protruding portion at a portion facing the protruding portion.
The concave portion is inserted into the convex portion when the external teeth and the internal gear mesh with each other, and contacts the convex portion at a predetermined relative rotational position when the external gear and the internal gear rotate relative to each other. A reclining device formed to restrict rotation within a certain range. The external gear is provided with two convex portions symmetrically with respect to the rotation center thereof,
The internal gear is provided with two concave portions that contact the convex portions according to the predetermined relative rotational position, and two protruding portions that are provided on the other side surface respectively facing the concave portions. The reclining device according to claim 1, wherein

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