JP2000333755A - Reclining device for seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop defect of connection between a cam-like plate and a lock gear and to prevent abnormal sound from being generated. SOLUTION: A lock mechanism 100 constituted in such a way that mutual rotation between a machine frame and a lid body is usually stopped by mating between a lock gear 20 arranged in the machine frame 10 and an inner gear 61 formed on the inner peripheral face of the lid body 60 and, by rotating an operating shaft 30 provided so as to pass it through the machine frame and the lid body, the lock is pulled in the central direction to release the lock and mutual rotation between the machine frame and the lid body is made free, is provided. It is constituted in such a way that, by integrating a cam-like plate 40 and the operating shaft 30 and extending a through-hole 12 for the operating shaft formed at the central part of the machine frame so as to move the operating shaft in the connecting direction between the lock gear 20 and the cam-like plate 40 and moving the operating shaft in the moving direction of the lock gear, defect of connection between the cam-like plate integrated with the operating shaft and the lock gear can be stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat reclining device in which a seat back can be rotated with respect to a seat cushion.

[0002]

2. Description of the Related Art Conventionally, as a vehicle seat reclining device of this kind, a machine frame having a base plate on the seat cushion side and a lid body having an arm plate on the seat back side are rotatable with each other. The interlock between the lock gear disposed in the machine frame and the internal gear formed on the inner peripheral surface of the cover prevents the mutual rotation between the machine frame and the cover, and penetrates the machine frame and the cover. By rotating the operation shaft provided as above, the lock gear is operated via the cam-shaped plate, and the engagement between the lock gear and the internal gear is released,
An arrangement configured to release a lock is known.

The above-mentioned cam-shaped plate for operating the lock gear has an elongated hole formed at the center thereof in the joining direction of the lock gear and the cam-shaped plate, and a clearance between the operating shaft inserted through the elongated hole and the elongated hole. Thus, the cam-shaped plate is configured to be movable in the direction of movement of the lock gear, and this movement prevents poor connection between the cam-shaped plate and the lock gear, and prevents the lock gear and the internal gear from being half-meshed. It can be stopped.

[0004]

As described above, in a vehicle seat reclining device configured to move a lock gear in a lock direction and a lock release direction via a cam-shaped plate by rotating an operation shaft, In order to prevent the lock gear and the internal gear from half-meshing, a small clearance is provided between the cam-shaped plate and the operating shaft, but the cam-shaped plate and the operating lever are attached by this clearance. There is a problem that play occurs between the operating lever and the operating shaft, and play of the operating lever and abnormal noise occur.

Therefore, conventionally, the operation lever is provided with a spring to prevent backlash between the cam-shaped plate and the operation shaft, thereby preventing generation of abnormal noise. For this reason, there are problems such as an increase in the number of parts and an increase in the number of assembly steps.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a vehicle seat reclining device capable of preventing poor connection between a cam-shaped plate and a lock gear and preventing generation of abnormal noise. The task is to provide.

[0007]

In order to solve the above-mentioned problems, the present invention covers an inner surface of a circular concave portion formed in a machine frame and rotates along an inner peripheral surface of the machine frame. The machine frame 10 and the cover 60 are normally engaged with the lock gear 20 disposed in the machine frame 10 and the internal gear 61 formed on the inner peripheral surface of the cover 60. The rotation of the operation shaft 30 provided through the machine frame 10 and the lid 60 is rotated to pull the lock gear 20 in the center direction to release the lock. A lock mechanism 100 configured to liberalize the mutual rotation of the machine frame 10 and the lid 60,
Is attached to either the seat cushion side or the seat back side, the outer surface of the lid body 60 is attached to the other side, and the arm plate 120 attached to the seat back side is moved in the front (F) direction. In the vehicle seat reclining device E configured by attaching the energizing spiral spring 130, the cam-shaped plate 40 for operating the lock gear and the operating shaft 30 are integrated and formed at the center of the machine frame 10. The operating shaft insertion hole 12 is extended so that the operating shaft 30 can move in the direction in which the lock gear 20 and the cam-shaped plate 40 can be joined, and the operating shaft 30 moves in the direction in which the lock gear 20 moves. The structure is such that a poor connection between the cam-shaped plate 40 integrated with the operation shaft 30 and the lock gear 20 can be prevented. It is characterized in that the.

According to the invention constructed as described above, since the cam-shaped plate 40 and the operation shaft 30 are integrated,
While it is possible to prevent the generation of abnormal noise, it is not necessary to provide a spring or the like for preventing backlash between the cam-shaped plate 40 and the operation shaft 30 as in the related art. Therefore, the number of parts can be reduced, and the number of assembling steps can be reduced.

Further, the cam-shaped plate 40 integrally fixed to the operation shaft 30 is connected to the lock gear 20 and the cam-shaped plate 40 by the elongated operation shaft insertion hole 12 formed at the center of the machine frame 10.
, The joint between the lock gear 20 and the cam-shaped plate 40 due to dimensional errors of the lock gear 20 and the cam-shaped plate 40 can be prevented, and the operation of the lock gear 20 can be prevented. Can be performed accurately.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments with reference to the drawings.

A vehicle seat reclining device E shown in the embodiment covers a circular concave portion 14 formed in a disc-shaped machine frame 10 and rotates along the inner peripheral surface of the machine frame 10. 60, and the mutual rotation between the machine frame 10 and the cover 60 is prevented by the engagement between the lock gear 20 normally arranged in the machine frame 10 and the internal gear 61 formed on the inner peripheral surface of the cover 60. Then, by rotating the operation shaft 30 provided through the machine frame 10 and the lid body 60, the lock gear 20 is pulled toward the center direction through the cam-shaped plate 40 to release the lock, and the machine frame 10 and the cover are unlocked. A lock mechanism 100 configured to liberalize mutual rotation with the body 60 is provided.

Also, a base plate 11 attached to a seat cushion (not shown) on the outer surface of the machine casing 10.
The arm plate 120 attached to the seat back (not shown) side is attached to the outer surface of the lid 60, and the arm plate 120 is further attached to the front (F).
A spiral spring 130 biasing in the direction is attached.

The cam-shaped plate 40 and the operation shaft 30 are integrated, and the operation shaft 30 is moved in the operation shaft insertion hole 12 formed in the center of the machine frame 10 in the moving direction of the lock gear 20. When the operation shaft 30 moves in the joining direction of the lock gear 20 and the cam-shaped plate 40, the cam-shaped plate 4 integrated with the operation shaft 30 is expanded.
The configuration is such that poor connection between the lock gear 20 and the lock gear 20 can be prevented.

Further, the configuration of the above embodiment will be described in detail.

The lock mechanism 100 includes a disk-shaped machine frame 10.
The internal gear is attached to the machine frame 10 so as to cover the inner surface of the circular concave portion 14 formed in the machine frame 10 and to have an outer peripheral surface rotatable along the inner peripheral surface of the machine frame 10. 6
1, a lock gear 20 which is disposed on the inner surface side of the machine frame 10 so as to be slidable in the radial direction and can mesh with the internal gear 61 of the cover body 60, and is formed at the center of the machine frame 10. An operation shaft 30 rotatably provided through the operation shaft insertion hole 12 and a through hole formed in the center of the lid 60, and rotating the operation shaft 30 provided integrally with the operation shaft 30. Plate 40 for actuating the lock gear 20 to the outer peripheral side
A plate 50 disposed on the cam-shaped plate 40 for operating the lock gear 20 to the inner peripheral side in synchronization with the rotation of the cam-shaped plate 40 caused by the rotation of the operation shaft 30; The lock gear 20 is meshed with the internal gear 61 by the urging force of the lock spring 70, and the machine frame 10 and the lid 60 are
And rotation of the operation shaft 30 (see FIG. 1).
The lock gear 20 to the plate 5
The mechanism frame 10 and the inner gear 61 are disengaged from each other by being pulled toward the center by zero, and the mutual rotation between the machine frame 10 and the lid 60 is liberated.

Further, the structure of the lock mechanism 100 will be described in detail. The lock gears 20 are arranged in pairs on the inner surface side of the machine frame 10 symmetrically about the operation shaft 30 and formed on the inner surface of the machine frame 10. The guide 11 is slidably fitted in a pair of parallel guide surfaces 11 a in a radial direction.

On the outer peripheral surface of the lock gear 20, an arcuate external gear 21 meshing with the internal gear 61 of the lid 60 is formed, and a convex portion engaging with the cam groove 51 of the plate 50 is formed on one side surface. 22 are protruded.

The operation shaft 30 is loosely fitted in the operation shaft insertion hole 12 formed in the center of the machine frame 10 and the through hole 62 formed in the center of the cover 60, respectively. 120 are loosely fitted and inserted into insertion holes 112 and 122 respectively formed in 120.

Operation shaft insertion hole 12 formed in machine frame 10
Is a main part of the present invention, in which a pair of plane portions 12a parallel to the joining direction of the lock gear 20 and the cam-shaped plate 40 and an arc portion 12b connecting the flat portions 12a are formed symmetrically about the operation shaft 30. Have been. The distance between the flat portions 12a is set to be the same as the diameter of the operation shaft 30, and the distance between the arc portions 12b is set to be longer than the diameter of the operation shaft 30.

An operation lever 31 is attached to a portion of the operation shaft 30 protruding outward on the base plate 110 side, and a spline 32 for both-side lock connection is provided on a portion protruding outward on the arm plate 120 side. Are formed. Note that an operation knob 33 is attached to the operation lever 31.

The cam-shaped plate 40 is press-fitted and fixed to an intermediate portion of the operating shaft 30 and engages with an engaging portion 23 formed on the outer peripheral surface of the lock gear 20 on the side opposite to the gear.
Are formed symmetrically about the operation shaft 30 as a pair. In addition, the cam-shaped plate 40 includes
The locking portions 42 for locking the outer ends 72 of the two lock springs 70 each having the base 71 attached to the two projections 13 formed on the inner surface of the machine frame 10 are formed symmetrically in pairs about the operation shaft 30. The lock gear 20 is always urged outward.

The plate 50 has a mounting hole formed on one side surface of the cam-shaped plate 40 so as to fit into a mounting projection 43 projecting from the circumference centered on the axis of the operating shaft 30 at an interval of 180 °. Thus, a cam groove 51 which is rotatable integrally with the cam-shaped plate 40, that is, the operation shaft 30, and is engaged with the convex portion 22 of the lock gear 20 is formed.

The lid 60 is fitted into a circular recess 14 formed on the inner surface of the machine frame 10, and rotates with respect to the machine frame 10 between the inner peripheral surface of the circular recess 14 and the outer peripheral surface of the lid 60. A ring-shaped internal gear 61 that can mesh with the external gear 21 of the lock gear 20 is formed on the inner peripheral surface of the circular recess formed in the lid 60. The lock gear 2
0, a convex portion 24 is formed radially outwardly adjacent to the convex portion 22. The convex portion 24 comes into contact with the inner side surface of the lid 60 so that the lock gear 20 is connected to the lid 60 and the machine frame. Regulations are made so that there is no play between the ten. The machine frame 10 and the lid 6
Numeral 0 is covered by a ring-shaped cover body 80 so as to sandwich the outer peripheral portion thereof, and is thereby supported so as to be rotatable relative to each other.

The lock mechanism 100 constructed as described above
According to this, the lock gear 20 is pressed radially outward by the cooperative action of the lock spring 70 and the cam-shaped plate 40,
The external gear 21 meshes with the internal gear 61 of the lid 60,
The rotation of the lid 60 is locked.

In this locked state, when the operation shaft 30 is rotated clockwise in FIG.
1 is disengaged from the engaging portion 23 of the lock gear 20 and the plate 5
The lock gear 20 moves toward the center by the cooperation of the cam groove 51 of the No. 0 and the convex portion 22 of the lock gear 20, and the engagement between the external gear 21 of the lock gear 20 and the internal gear 61 of the lid 60 is released. The lock of the lid 60 is released, and the arm plate 120 attached to the lid 60 is configured to rotate in the front (F) direction by the urging force of the spiral spring 130.

The lid 60 and the arm plate 120 have a plurality of, for example, three convex portions formed on the outer surface of the lid 60, and the same number of mounting holes for engaging with the convex portions are formed in the arm plate 120. Then, the mounting hole and the projection are fixed by welding. Further, the machine casing 10 and the base plate 110 are similarly fixed.

The arm plate 120 has a mounting portion 121 to the seat back side and a locking means 140 for locking the inner portion 131 of the spiral spring 130. The arm plate 120 has a through hole 122 formed in the center. The operation shaft 30 is loosely fitted and inserted.

The locking means 140 for locking the inner portion 131 of the spiral spring 130 is provided below the through hole 122 of the arm plate 120 and follows a locus of a predetermined radius of curvature centered on the through hole 122. And arm plate 1
20 is cut and raised in a semicircular shape, and the cut and raised portion 14 is formed.
The inner end 132 of the spiral spring 130 is engaged with a concave portion 142 formed on one side end of the spring 1.

In FIGS. 4 and 8, reference numeral 123 denotes a forward-falling stopper. When the arm plate 120, that is, the seat back rotates in the front (F) direction, a spring engaging portion (or vortex) projecting from the base plate 110 is provided. The front fall stopper 123 abuts against the stopper pin 111 which also serves as the outer end 133 of the winding spring 130), thereby restricting the rotation of the seat back in the front (F) direction.

It should be noted that the present invention is not limited to this embodiment, and the arm plate 120 may be mounted on the machine frame 10 and the lid 60 may be mounted on the seat cushion side, contrary to the above structure.

Further, even if the plate 50 is not provided, the cam-shaped plate 4
0 may directly pull the lock gear 20 in the center direction to release the engagement with the internal gear 61.

According to the vehicle seat reclining device E configured as described above, the cam-shaped plate 40 and the operating shaft 30 are integrated, so that the generation of abnormal noise can be prevented. As shown in FIG.
There is no need to provide a spring or the like for preventing backlash between zero. Therefore, the number of parts can be reduced, and the number of assembling steps can be reduced.

The cam-shaped plate 40 integrally fixed to the operation shaft 30 has a slot-like operation shaft insertion hole 12 formed in the center of the machine frame 10 in the radial direction, that is, the lock gear 2.
Since the lock gear 20 and the cam-shaped plate 40 are configured to be able to move a little in the joining direction, it is possible to prevent poor connection between the lock gear 20 and the cam-shaped plate 40 due to dimensional errors of the lock gear 20, the cam-shaped plate 40 and the like. Thus, the operation of the lock gear 20 can be performed accurately.

[0034]

According to the vehicle seat reclining device of the present invention, since the cam-shaped plate and the operating shaft are integrated,
While it is possible to prevent the generation of abnormal noise, it is not necessary to provide a spring or the like for preventing backlash between the cam-shaped plate and the operation shaft as in the related art. Therefore, the number of parts can be reduced, and the number of assembling steps can be reduced.

The cam-shaped plate integrally fixed to the operating shaft can be moved a little in the radial direction, that is, in the moving direction of the lock gear, by an elongated operating shaft insertion hole formed in the center of the machine frame. With such a configuration, it is possible to prevent poor connection between the lock gear and the cam-shaped plate due to dimensional errors of the lock gear, the cam-shaped plate, and the like, and to accurately operate the lock gear.

[Brief description of the drawings]

FIG. 1 is an explanatory front view showing a lock mechanism according to an embodiment of the present invention with a part removed.

FIG. 2 is an explanatory front view of the machine frame.

FIG. 3 is an exploded perspective view of the lock mechanism.

FIG. 4 is an explanatory front view of the vehicle seat reclining device.

FIG. 5 is an explanatory view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is an explanatory view taken in the direction of arrows VI-VI in FIG. 5;

FIG. 7 is an explanatory view taken in the direction of arrows VII-VII in FIG. 6;

FIG. 8 is an explanatory front view of the arm plate.

FIG. 9 is an explanatory sectional view taken along the line VIII-VIII in FIG. 8;

DESCRIPTION OF SYMBOLS 10 Machine frame 12 Operation shaft insertion hole 14 Circular recess 20 Lock gear 30 Operation shaft 40 Cam-shaped plate 60 Lid 61 Internal gear 100 Lock mechanism 120 Arm plate 130 Spiral spring E Vehicle seat reclining device

Claims (1)

[Claims] 1. A lock gear that covers an inner surface of a circular recess formed in a machine frame and that rotates along the inner peripheral surface of the machine frame. The meshing with the internal gear formed on the inner peripheral surface of the lid prevents mutual rotation between the machine frame and the lid, and rotates the operation shaft provided through the machine frame and the lid. A lock mechanism configured to release the lock by pulling the lock gear in the center direction to thereby release the mutual rotation between the machine frame and the lid, and to set the outer surface of the machine frame to a seat cushion side. Or a vehicle which is attached to one of the seat back side, the outer surface of the lid is attached to the other side, and a spiral spring for urging the arm plate attached to the seat back side toward the front is attached. For sea In the reclining device, a cam-shaped plate for operating the lock gear and an operation shaft are integrated with each other, and an operation shaft insertion hole formed in a center portion of the machine frame is provided with a small amount of the operation shaft and the lock gear and the cam-shaped plate. And the operating shaft is moved in the moving direction of the lock gear, thereby preventing poor connection between the cam-shaped plate integrated with the operating shaft and the lock gear. A seat reclining device for vehicles.