JP2018192921A - Reclining device - Google Patents

Abstract

To provide a reclining device capable of preventing a deviation of a load caused by use of a movable guide and reducing costs by a reduction of the number of components.SOLUTION: A reclining device 100 includes: a base plate 10 in which a plurality of lock gear guide sections are formed by a guide section having a guide surface; a lock gear 20 which has external teeth on an outer peripheral surface and is arranged to be movable only in a radiation direction in the lock gear guide section; a gear plate 60 which has internal teeth fittable to the external teeth of the lock gear; a center cam 30 which moves the lock gear so as to be fittable to the internal teeth of the gear plate; and an energization member 50 which is engaged with the center cam so as to energize the center cam in a fixed direction. A recess for insertion of the energization member for inserting an end of the energization member is formed on at least one guide surface brought into contact with the lock gear.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reclining device.

  2. Description of the Related Art A reclining device called a conventional manual-type round reclining has a first lock gear and a second lock gear, and the first lock gear has a first guide surface of one of the guide convex portions and a second one of the guide convex portions. The second lock gear is supported by a movable guide guided by one guide surface so as to be slidable only in the radial direction, and the second lock gear has one second guide surface of the guide convex portion and the other of the guide convex portions. There are some which are guided by the second guide surface and slidably supported only in the radial direction.

  Such a reclining device uses a movable guide to prevent rattling of the first lock gear. However, since another member called the movable guide is used to prevent rattling, there is a problem that the movable guide itself may be rattled. Further, since the movable guide is used, there is a problem that the cost is increased accordingly. Furthermore, when the movable guide is used, there is a problem that a deviation occurs between the load of the first lock gear that acts via the movable guide and the load that acts directly on the second lock gear.

JP 2012-56397 A

  The present invention has been made in view of such a problem, and provides a reclining device that can prevent a load from being biased by using a movable guide and can reduce costs by reducing the number of components. With the goal.

  The present invention adopts the following means in order to achieve at least one of the above-mentioned main objects.

The reclining device according to the present invention is
A base plate in which a plurality of lock gear guide portions are formed by a guide portion having a guide surface;
A lock gear having external teeth on the outer peripheral surface and arranged to be slidable on the lock gear guide;
A gear plate having internal teeth that can be engaged with external teeth of the lock gear;
A central cam for moving the lock gear so as to be matable with the internal teeth of the gear plate;
A biasing member that engages with the central cam to bias the central cam in a fixed direction;
With
On at least one guide surface in contact with the lock gear, a biasing member insertion recess for inserting an end of the biasing member is formed,
The urging member insertion recess is formed in a tapered shape so that the width of the urging member insertion portion is gradually reduced toward the urging direction of the end of the urging member.

In the reclining device according to the present invention,
One end portion of the urging member urges the central cam so as to press the lock gear in a direction to mesh with the gear plate, and is inserted into the urging member insertion recess. The other end portion of the urging member may be urged in a direction in which the width with the lock gear becomes narrower.

Furthermore, in the reclining device according to the present invention,
The end of the urging member may be characterized in that a surface in contact with the lock gear and a surface in contact with the urging member insertion recess are formed flat.

Furthermore, in the reclining device according to the present invention,
A cam plate that is attached to the central cam and moves the lock gear in a direction to release the engagement from the gear plate by moving the biasing member in a direction opposite to the biasing direction of the biasing member;
It may be characterized by comprising.

FIG. 1 is an exploded perspective view showing an outline of a configuration of a reclining device 100 according to the present embodiment. FIG. 2 is a perspective view showing the base plate 10 of the reclining device 100 according to the present embodiment. FIG. 3 is a perspective view showing the lock gear 20 and the central cam 30 of the reclining device 100 according to the present embodiment. FIG. 4 is a perspective view and a rear view showing the back side of the gear plate 60 of the reclining device 100 according to the present embodiment. FIG. 5 is a schematic view showing a state in which the reclining device 100 according to the present embodiment is mounted on a vehicle seat. FIG. 6 is an explanatory diagram for explaining the movement of the reclining device 100 according to the present embodiment. FIG. 7 is an explanatory diagram for explaining the movement of the reclining device 100 according to the present embodiment. FIG. 8 is a schematic diagram showing another embodiment of the reclining device 100 according to the present embodiment.

  Next, an embodiment of the reclining device 100 according to the present invention will be described in detail with reference to the drawings. The embodiments and drawings described below exemplify a part of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations, and do not depart from the gist of the present invention. The range can be changed as appropriate.

  As shown in FIG. 1, a reclining device 100 according to the present invention mainly includes a circular base plate 10, four lock gears 20 arranged on the base plate 10, a central cam 30 arranged at the center of the lock gear 20, and a cam plate. 40, a biasing member 50, a gear plate 60 having an inner tooth 61 (see FIG. 4) on the inner periphery, and a cover bracket 70.

  As shown in FIG. 2, the base plate 10 has a pair of first lock gear guide portions 11a and a pair of second lock gear guide portions 11b for guiding the slide movement of the four lock gears 20 in the radial direction from the center. ing. The pair of first lock gear guide portions 11a are disposed to face each other at the center of the base plate 10, and the pair of second lock gear guide portions 11b are disposed to face each other at the center of the base plate 10. The first lock gear guide portion 11a is disposed so as to be shifted by 90 ° at the center of the base plate 10. Guide portions 12 are formed on both side surfaces of the lock gear guide portion 11. The guide part 12 protrudes from the inner surface of the base plate 10 and forms guide surfaces on both sides of the lock gear guide part 11. At least one of the guide surfaces is formed with a biasing member insertion recess 14 in which an end of the biasing member 50 is accommodated. In the present embodiment, the urging member insertion recesses 14 are respectively formed on the right guide surfaces of the pair of first lock gear guide portions 11a when viewed in the radial direction from the center. The urging member insertion recess 14 is such that the distance from the first lock gear guide portion 11a (α in FIG. 6) becomes narrower toward the direction in which the end of the urging member 50 is urged, that is, toward the center. Is formed so as to have a width narrower than the thickness of the biasing member 50 on the most central side.

  As shown in FIG. 1 or FIG. 3, the lock gear 20 has a pair of first lock gears 21 arranged to face the center of the base plate 10 and the first lock gear 21 at about 90 at the center. And a pair of second lock gears 22 that are arranged to be shifted (rotated) to face each other. In the present embodiment, the first lock gear 21 constitutes the main lock gear, and the second lock gear 22 constitutes the sub-lock gear. Good. Each of the lock gears 20 is formed to have a width substantially the same as the width of the lock gear guide portion 11 of the corresponding base plate 10 and is movable in the radial direction but not to move in the circumferential direction. (There may be some rattling). Outer teeth 23 that mesh with the inner teeth 61 of the gear plate 60 are formed on the outer peripheral surface of the lock gear 20. On the other hand, a lock gear recess 24a is formed on the inner peripheral surface of each lock gear 20, and rear end protrusions 24b are formed on both sides thereof. The lock gear recess 24a and the rear end protrusion 24b move following an outer peripheral surface of a center cam 30 described later, whereby the lock gear 20 slides in the radial direction. Each first lock gear 21 has a first protrusion 25 formed to protrude to the front side, and each second lock gear 22 is formed to protrude to the front side, and The second protrusion 26 is lower than the first protrusion 25. The first protrusion 25 is disposed so as to protrude from a first cam hole 41 of the cam plate 40 described later, and the second protrusion 26 is disposed so as not to protrude from the second cam hole 42.

  The central cam 30 is made of a plate-like member, and is provided with a pair of projecting pieces 31 that can come into contact with the rear end projecting portions 24b on both sides of the lock gear recess 24 formed on the inner surface side of the lock gear 20. Yes. The protruding pieces 31 are provided corresponding to the pair of first lock gear 21 and second lock gear 22, respectively, and a total of eight protruding pieces 31 are formed at four locations. Of the projecting pieces 31, the projecting piece 31 that contacts the second lock gear 22 is formed slightly shorter than the projecting piece 31 of the first lock gear 21, and a gap is provided between the projecting piece 31 and the second lock gear 22. Yes. This is for ensuring lock-in performance. A central cam recess 33 is provided between the protruding pieces 31. A shaft through-hole 35 into which an operation shaft 90 for operating the central cam 30 is inserted is formed in a substantially cross shape at the center of the central cam 30. Further, two central cam protrusions 36 and two biasing member through holes 37 are alternately formed around the shaft through hole 35.

  The cam plate 40 is a member for moving the lock gear 20 by the movement of the operation shaft 90. As shown in FIG. 1, the cam plate 40 is provided with a first cam hole 41 at a position corresponding to the first protrusion 25 of the pair of first lock gears 21. A second cam hole 42 is provided at a position corresponding to the two protrusions 26. The first cam hole 41 and the second cam hole 42 are both wider than the first protrusion 25 and the second protrusion 26, and the outer peripheral surfaces of the first cam hole 41 and the second cam hole 42 are rotated ( In this embodiment, the first projection 25 and the second projection 26 are formed by rotating the cam plate 40 counterclockwise. Press and move in the center direction. Further, the cam plate 40 has an interference prevention hole 43 for preventing interference with the biasing member 50, a fitting hole 44 for fitting with the central cam protrusion 36, the operation shaft 90 and the biasing member 50. Is inserted.

  The biasing member 50 is made of a curved long linear or plate-like spring material, and one end 51 is inserted into the biasing member through hole 37 of the central cam 30 and the other end 52 is the base plate 10. The urging member insertion recess 14 is inserted. The urging member 50 is attached so as to urge in the direction in which the curvature of curvature increases (the direction of the arrow), and the other end 52 inserted into the urging member insertion recess 14 is in the center direction of the base plate 10. The central cam 30 is urged in a locking direction (right rotation direction). The tip of the other end 52 of the urging member 50 may be formed in a flat surface so as to be in surface contact with the side surfaces of the first lock gear 21 and the urging member insertion recess 14.

  As shown in FIG. 4, the gear plate 60 is provided with internal teeth 61 that mesh with the lock gear 20. On the further back side of the inner teeth 61, a first protrusion support portion 62 is provided that is provided with an arc shape and a step on the inner periphery side with respect to the outer periphery.

  The cover bracket 70 is a cover for assembling the base plate 10 and the gear plate 60 so as to be relatively rotatable, and the form thereof is not particularly limited.

  As shown in FIG. 1, each component manufactured as described above has a lock gear 20 disposed with respect to each lock gear guide portion 11 of the base plate 10. The pair of first lock gears 21 are arranged in the first lock gear guide part 11a provided with the biasing member insertion recess 14 shown in FIG. 2, and the pair of second lock gears 22 are arranged in the second lock gear guide. It arranges in part 11b. A central cam 30 is disposed at the center of these lock gears 20. Then, after being attached to the central cam protrusion 36 of the central cam 30 while being fitted into the fitting hole 44 of the cam plate 40, the one end 51 of the biasing member 50 is attached to the biasing member through hole 37 of the central cam 30. The other end 52 is inserted into the biasing member insertion recess 14 of the base plate 10. Then, after covering the gear plate 60 so that the inner teeth 61 of the gear plate 60 and the outer teeth 23 of the lock gear 20 mesh, the reclining device 100 is completed by fixing with the cover bracket 70.

  As shown in FIG. 5, the reclining device 100 thus completed fixes the base plate 10 to the seat back 201 of the vehicle seat 200 via the seat back bracket 202, and the gear to the seat cushion 203 via the seat cushion bracket 204. The plate 60 is fixed to the vehicle seat 200.

  Next, an operation method of the reclining device 100 assembled as described above will be described. When the seat back 201 of the vehicle seat 200 is in the position of the driving posture, that is, when the seat back 201 is standing up and the operation lever 205 is not operated, as shown in FIG. The central cam 30 is urged by the urging member 50 in the clockwise direction (the direction of the arrow). Due to this urging force, the protruding piece 31 of the central cam 30 presses the rear end protruding portion 24 b of the lock gear 20. Therefore, the outer teeth 23 of all the lock gears 20 mesh with the inner teeth 61 of the gear plate 60, and the positions of the base plate 10 and the gear plate 60 are fixed and do not rotate relatively. That is, the seat back 201 is in a fixed state. In this state, the other end 52 of the urging member 50 is urged in the central direction in the urging member insertion recess 14. The biasing member insertion recess 14 is formed so that the distance from the first lock gear 21 becomes narrower toward the center direction, and the width is narrower than the thickness of the biasing member 50 on the most central side. Therefore, the first lock gear 21 is strongly pressed in the urging member insertion recess 14. Thereby, rattling of the first lock gear 21 can be prevented.

  To move the seat back 201 from this state, that is, to bring the seat back 201 into the unlocked state, the operation lever 205 is operated. When the operation lever 205 is pulled upward, the operation shaft 90 rotates in the left rotation direction, and accordingly, the central cam 30 rotates in the left rotation direction (arrow direction in FIG. 7). As a result, as shown in FIG. 7, the protruding piece 31 of the central cam 30 moves to the position of the lock gear recess 24 of the lock gear 20, and the lock gear 20 can move toward the center of the base plate 10. At the same time, the one end portion 51 of the urging member 50 moves in the left rotation direction, whereby the urging direction of the other end portion 52 is changed from the urging force in the central direction to the urging force in the radial direction. As a result, the pressing force to the lock gear 20 is released, the first lock gear 21 is released, and the movement toward the center is possible. Further, since the cam plate 40 (represented by a dotted line) is fitted with the central cam protrusion 36 of the central cam 30 and the fitting hole 44, the cam plate 40 is also interlocked with the movement of the central cam 30. Rotate in the direction of the arrow. By the rotation of the cam plate 40, the positions of the first cam hole 41 and the second cam hole 42 of the cam plate 40 are moved, and the first protrusion 25 of the first lock gear 21 and the second lock gear 22 of the second lock gear 22 are moved. The two protrusions 26 slide on the outer peripheral surfaces of the first cam hole 41 and the second cam hole 42, respectively. Since the outer peripheral surfaces of the first cam hole 41 and the second cam hole 42 are formed as surfaces that gradually become closer to the center when rotated counterclockwise, the first lock gear 21 and the second lock gear 22 are respectively , It moves in the direction of releasing the meshing, that is, in the central direction. Thereby, the external teeth 23 of all the lock gears 20 and the internal teeth 61 of the gear plate 60 are disengaged, and the base plate 10 and the gear plate 60 can be relatively rotated. That is, the seat back 201 can be moved back and forth.

  When the seat back 201 is moved to a position behind the predetermined position (a position other than free) and the operation lever 205 is released, the locked state is brought about by the reverse movement to the unlocked state described above. That is, by releasing the operation lever 205, the central cam 30 rotates in a direction to return to the state of FIG. 6 by the biasing force of the biasing member 50. As a result, the cam plate 40 also returns to the initial position, and the lock gear 20 can move in the radial direction. At the same time, the protruding piece 31 of the central cam 30 presses the rear end protruding portion 24b of the lock gear 20 to move the lock gear 20 in the radial direction. As a result, the outer teeth 23 of all the lock gears 20 mesh with the inner teeth 61 of the gear plate 60, and the positions of the base plate 10 and the gear plate 60 are fixed and cannot be rotated relative to each other. At the same time, the other end 52 of the urging member 50 is urged in the central direction within the urging member insertion recess 14, and the position of the first lock gear 21 is fixed by strongly pressing the first lock gear 21. Prevent rattling. Thus, the seat back 201 is locked and fixed at a predetermined position.

  On the other hand, when the operation lever 205 is released with the seat back 201 moved to the front position (free position), the first protrusion 25 supports the first protrusion 25 in the first lock gear 21 in the free position. It arrange | positions in the position contact | abutted with the part 62. FIG. Accordingly, the central cam 30 is urged in a direction to return to the initial position by the urging force of the urging member 50. However, the first protrusion 25 of the first lock gear 21 has the first protrusion as shown in FIG. 4B. The movement in the radial direction is prevented by the portion support portion 62. Therefore, the central cam 30 does not return to the initial position. Therefore, the second lock gear 22 also does not return to the initial position, and the external teeth 23 of the first lock gear 21 and the second lock gear 22 do not mesh with the internal teeth 61 of the gear plate 60. Therefore, the base plate 10 and the gear plate 60 can be moved relative to each other, and the seat back 201 can be freely moved at any position in the free position.

  As described above, according to the present embodiment, since the first lock gear 21 is directly pressed by the biasing member 50, it is possible to prevent rattling more reliably as compared with the case where a movable guide is used as in the prior art. it can. Further, by not using the movable guide, the first lock gear 21 that is prevented from rattling and the second lock gear 22 that is not prevented from rattling can prevent a load from being biased through the movable guide. can do. Furthermore, by eliminating the movable guide, it contributes to cost reduction and simplification of the assembly process.

  In the above-described embodiment, the urging member 50 is attached so as to urge in the direction in which the curvature of curvature increases (the direction of the arrow), and the other end inserted into the urging member insertion recess 14. 52 is biased in the center direction of the base plate 10 and the central cam 30 is biased in the locking direction (right rotation direction). However, as shown in FIG. 8, the biasing direction of the biasing member 50 is reduced in curvature. The other end 52 inserted into the biasing member insertion recess 14 is biased in the radial direction of the base plate 10 and the central cam 30 is biased in the locking direction (left rotation direction). Also good. In this case, the urging member insertion recess 14 is tapered such that the distance (α in FIG. 6) from the first lock gear guide 11a becomes narrower toward the radial direction. The biasing member 50 is formed to have a width narrower than the thickness. Further, contrary to the first embodiment, the lock gear 20 and the cam plate 40 are formed so as to be in a locked state at the left rotation side and to be in an unlocked state at the right rotation side.

  In the above-described embodiment, the urging member insertion recesses 14 are formed on the respective guide surfaces that come into contact with the pair of first lock gears 21, but may be provided only on one of them. Moreover, you may provide in the guide surface which contacts the 2nd lock gear 22. FIG.

  As shown in the above-described embodiment, it can be used as a reclining device for a vehicle seat.

DESCRIPTION OF SYMBOLS 10 ... Base plate, 11 ... Lock gear guide part, 11a ... 1st lock gear guide part, 11b ... 2nd lock gear guide part, 12 ... Guide part, 14 ... Recessed part for biasing member insertion, 20 ... Lock gear, 21 ... 1st lock gear, 22 ... 2nd lock gear, 23 ... External teeth, 24 ... Lock gear recess, 24a ... Lock gear recess, 24b ... Rear end protrusion, 25 ... 1st protrusion, 26 ... 2nd protrusion, DESCRIPTION OF SYMBOLS 30 ... Center cam, 31 ... Projection piece, 33 ... Center cam recessed part, 35 ... Shaft through-hole, 36 ... Center cam protrusion, 37 ... Through-hole for biasing members, 40 ... Cam plate, 41 ... 1st cam hole 42 ... second cam hole, 43 ... interference prevention hole, 44 ... fitting hole, 45 ... insertion hole, 50 ... biasing member, 51 ... one end, 52 ... other end, 60 ... gear plate, 61 ... Internal teeth, 62 ... first protrusion support, 70 ... cover bra Tsu DOO, 90 ... operating shaft, 100 ... reclining device, 200 ... vehicle seat, 201 ... seat back, 202 ... seat back bracket 203 ... seat cushion, 204 ... seat cushion bracket 205 ... operating lever

Claims (4)

A base plate in which a plurality of lock gear guide portions are formed by a guide portion having a guide surface;
A lock gear having outer teeth on the outer peripheral surface and arranged to be slidable on the lock gear guide;
A gear plate having internal teeth that can be engaged with external teeth of the lock gear;
A central cam for moving the lock gear so as to be matable with the internal teeth of the gear plate;
A biasing member that engages with the central cam to bias the central cam in a fixed direction;
With
On at least one guide surface in contact with the lock gear, a biasing member insertion recess for inserting an end of the biasing member is formed,
The urging member insertion recess is formed in a taper shape so that the width of the urging member insertion recess gradually narrows toward the urging direction of the end of the urging member. .   One end portion of the urging member urges the central cam so as to press the lock gear in a direction to mesh with the gear plate, and is inserted into the urging member insertion recess. 2. The reclining device according to claim 1, wherein the other end portion of the urging member is urged in a direction in which the width with the lock gear becomes narrower.   3. The reclining device according to claim 1, wherein the end portion of the urging member has a flat surface in contact with the lock gear and a surface in contact with the urging member insertion recess. 4. In the reclining apparatus of any one of Claim 1 to 3,
A cam plate that is attached to the central cam and moves the lock gear in a direction to release the engagement from the gear plate by moving the biasing member in a direction opposite to the biasing direction of the biasing member;
A reclining device comprising:

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