JP2002101999A - Seat reclining device of vehicule - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat reclining device of a vehicule preventing loosening of a cover in a circumferential direction at a locked time. SOLUTION: Among plural lock gears 20, one lock gear 23 is divided in the radial direction, an almost trough-shaped cam surface 23c inclining toward this divided surface is formed, a wedge member 80 is arranged and constituted between this almost trough-shaped cam surface 23c and a cam-like plate 40, and when operating the plural lock gears 20 outward by rotating the cam-like plate 40, the wedge member 80 is brought into pressure contact with the almost trough-shaped cam surface 23c of the divided lock gears 23, these lock gears 23 laterally expansively open, and bring left and right both side surfaces of the lock gears 23 into pressure contact with an inside surface of a guide 11 to prevent the circumferential directional looseness of the cover body 60.

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 type, a machine frame attached to a seat cushion side and a lid body attached to a seat back side are provided so as to be rotatable relative to each other. A plurality of, for example, three lock gears radially arranged in the inside and an internal gear formed on the inner peripheral surface of the lid are meshed with each other to prevent mutual rotation between the machine frame and the lid. Things are known.

In this vehicle seat reclining device, since the lock gear slides in the radial direction, there is a clearance between the lock gear and its guide surface, and this clearance acts as backlash in the circumferential direction. There is a problem that the backlash increases.

[0004] A vehicle seat reclining device as described above is disclosed in Japanese Patent Application Laid-Open No. 1-104201, and in the embodiment disclosed in this specification, a lid, that is, a backlash in a circumferential direction of a seat back is removed. To prevent
One lock gear and the other two lock gears are intentionally offset by one third of the tooth pitch.

[0005]

In the above-described vehicle seat reclining device, in the locked state where the mutual rotation between the machine frame and the lid is prevented by the engagement of the three lock gears and the internal gears of the lid. However, since only one lock gear is completely locked and the other two lock gears are half-meshed, there is a problem that the meshing strength of the teeth is weakened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem. One of a plurality of lock gears is divided radially, and the divided lock gears are divided into cam-shaped plates via a wedge member. It is an object of the present invention to provide a vehicle seat reclining device in which a backlash in a circumferential direction of a lid during locking is prevented by pressing the seat.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 covers an inner surface side of a circular concave portion (14) formed in a disc-shaped machine frame (10), and A plurality of lock gears (20) having a lid (60) that rotates along the inner peripheral surface of the machine frame (10) and normally disposed in the machine frame (10) via a guide (11). And the lid (6
By interlocking with the internal gear (61) formed on the inner peripheral surface of (0), the mutual rotation between the machine frame (10) and the lid (60) is prevented, and the machine frame (10) and the lid are prevented. A cam plate (40) integrated with the operation shaft (30) by rotating an operation shaft (30) loosely fitted to the (60), and a lock driven by the cam plate (40). The locks are released by pulling the plurality of lock gears (20) toward the center via a release plate (50), and the machine frame (10) is released.
A lock mechanism (100) configured to liberalize the mutual rotation of the lid (60) and the lid (60) is provided, and one of the machine frame (10) and the lid (60) is placed on the seat cushion (150) side. A seat reclining device (E) for a vehicle, wherein one of the three lock gears (20) is divided in the radial direction while being attached and the other attached to the seat back (160). And a substantially valley-shaped cam surface (23) inclined toward the divided surface.
c), and the substantially valley-shaped cam surface (23) is formed.
c) and the cam-shaped plate (40), a wedge member (80) is arranged, and the cam-shaped plate (40) presses the wedge member (80) to form the divided lock gear. (2
3) is pressed against the substantially valley-shaped cam surface (23c), and the lock gear (23) moves radially outward to mesh with the internal gear (61), and expands right and left to open and close the lock gear (23). The left and right side surfaces of 23) are in contact with both side surfaces of the guide (11), respectively.

[0008] The invention according to claim 2 is the invention, wherein the wedge member (8
0) is formed in a disk shape.

According to a third aspect of the present invention, the cam-shaped plate (4
In each of the cam surfaces (41) of (0), the operating surface of the wedge member (80) of the cam surface (41c) corresponding to the divided lock gear (23) is centered on the axis of the operating shaft (30). It is characterized by being formed in an arc shape.

[0010] The first aspect of the present invention is configured as described above.
In the described invention, when the cam-shaped plate (40) is rotated to operate the plurality of lock gears (20) outward, the substantially valley-shaped cam surface of the divided lock gear (23). The wedge member (80) is pressed against the (23c), and the lock gear (23) expands left and right to press the left and right side surfaces of the lock gear (23) against both side surfaces of the guide (11).

Thus, the play of the lock gear (20) at the time of locking can be prevented, and the play of the cover (60) in the circumferential direction can be prevented.

According to the second aspect of the present invention, since the wedge member (80) is formed in a disk shape, it is easy to press the lock gear (23) radially outward and to expand the lock gear (23) right and left. The structure can be easily performed, and the lock mechanism (10
Operation 0) can be reliably performed.

According to the third aspect of the present invention, the operating surface of the wedge member (80) of the cam surface (41c) of the cam plate (40) corresponding to the divided lock gear (23) is formed in an arc shape. The lock mechanism (100) can be reliably operated by preventing the other lock gears (21, 22) from being half-meshed.

[0014]

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

In this embodiment, the case where three lock gears are used is described as an example. However, the same effect can be obtained when two or three or more lock gears are used.

The vehicle seat reclining device E according to the present invention includes a circular recess 14 formed in a disc-shaped machine frame 10.
And a plurality of, for example, three, lock gears 20 which are disposed inside the machine frame 10 via the guides 11 and which cover the inner side of the machine gear 10 and rotate along the inner peripheral surface of the machine frame 10. And the internal gear 61 formed on the inner peripheral surface of the lid body 60 prevents mutual rotation between the machine frame 10 and the lid body 60, and is provided so as to be loosely fitted to the machine frame 10 and the lid body 60. By rotating the operating shaft 30, the lock gear 20 is pulled toward the center through the cam-shaped plate 40 integrated with the operating shaft 30 and the unlocking plate 50 driven by the cam-shaped plate 40 to release the lock. And a lock mechanism 100 configured to liberalize the mutual rotation between the machine frame 10 and the lid 60.

A base plate 110 attached to the seat cushion 150 is provided on the outer surface of the machine frame 10.
An arm plate 120 attached to the seat back 160 is attached to the outer surface of the lid 60, and a spiral spring 130 for urging the arm plate 120 in the front (F) direction is attached.

Then, one of the three lock gears 20
The two lock gears 23 are divided in the radial direction, and a substantially valley-shaped cam surface 23c inclined toward the divided surface is formed.
Further, a wedge member 80 is arranged between the substantially valley-shaped cam surface 23c and the cam-shaped plate 40, and the cam-shaped plate 40 is rotated to operate each lock gear 20 outward. When the lock gear 23 is divided, the substantially valley-shaped cam surface 23
c, the wedge member 80 is pressed into contact, the lock gear 23 moves radially outward to mesh with the internal gear 61 of the lid 60, and expands right and left so that the left and right side surfaces of the lock gear 23 By pressing against both side surfaces, the backlash of the lid body 60 in the circumferential direction is prevented.

Further, the configuration of an embodiment of the vehicle seat reclining device E will be described in detail.

The vehicle seat reclining device E includes a machine frame 10, a cover 60, a lock gear 20, an operation shaft 30
And a lock mechanism 100 including a cam-shaped plate 40, a lock spring 70, a lock release plate 50, and a wedge member 80, and a base plate 150 Arm plates 120 are attached to the outer side surfaces, respectively.

The machine frame 10 is formed in a disk shape, and a base plate 110 attached to the seat cushion 150 is fixed to an outer surface thereof. In addition, machine frame 10
A circular concave portion 14 is formed concentrically on the outer peripheral surface side of.

The lid 60 is formed in a disk shape and covers the inner side of the circular concave portion 14 of the machine frame 10.
Is mounted on the machine frame 10 so as to have an outer peripheral surface rotatable along the inner peripheral surface of the circular concave portion 14. An internal gear 61 that can mesh with the lock gear 20 is formed on the inner peripheral surface of the circular recess formed on the outer peripheral surface side of the lid 60.

The outer surface of the lid 60 is provided with a seat back 16.
An arm plate 120 attached to the zero side is fixed, and the lid 60 and the machine frame 10 are covered by a ring-shaped cover 90 so as to sandwich the outer peripheral portion.
Thereby, they are supported so as to be rotatable with each other.

In this embodiment, the lock gear 20 is
Three substantially rectangular lock gears 21, 22, 23 radially arranged on the inner surface side of the machine frame 10 at intervals of 120 degrees
Consists of

The lock gears 21 and 22 are formed in the same shape, and are inserted into the inner surface of the guide 11 formed inside the machine frame 10 so as to operate in the radial direction with a small gap.

On the outer peripheral surfaces of the lock gears 21 and 22, external gears 21a and 22a are formed in arcuate portions having the same radius as the internal gear 61 of the lid 60, respectively.
The cam groove 51 described later on the unlocking plate 50
The elliptical actuating projections 21b and 22b are respectively provided to protrude. Further, cam surfaces 21c and 22 engageable with a cam surface 41 described later of the cam-shaped plate 40 are provided on outer peripheral surfaces of the lock gears 21 and 22 on the side opposite to the external gears 21a and 22a.
c are respectively formed.

The lock gear 23 comprises left and right symmetrical lock gears 23A and 23B divided into two parts in the radial direction, and has a divided surface formed on the inner surface of the guide 11 so that it can slide in the radial direction with a small gap. Are each formed with a slightly inclined tapered surface 23d so as to open inward.

On the outer peripheral surfaces of the lock gears 23A and 23B,
An arcuate external gear 23 a having the same radius as the internal gear 61 of the lid 60 is formed, and an operation projection that engages with the cam groove 51 of the lock release plate 50 is provided on a side surface on the machine frame 10 side. 23b are protrudingly provided. The operation projections 23b of the lock gears 21 and 22 are overlapped with the operation projections 23b of the lock gears 23A and 23B.
It is formed to be substantially the same ellipse as b.

Further, the outer peripheral surfaces of the lock gears 23A and 23B on the opposite side of the external gear 23a are each formed in a substantially mountain shape protruding toward the outer peripheral side, thereby forming a substantially valley shape inclined toward the tapered surface 23d. A cam surface 23c is formed.

The operating shaft 30 is loosely fitted in through holes 12 and 62 formed in the center of the machine frame 10 and the lid 60, respectively.
0 are loosely inserted into the support holes 112 and 122 respectively formed in the holes. Thereby, the operation shaft 30 can move in the operation direction of the lock gear 20, and the operation shaft 30
Variations in the lock position between the cam-shaped plate 40 and the lock gears 20 integrated with the lock gear 20 can be absorbed to prevent poor joining, that is, a half-meshed state during locking.

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

The cam-shaped plate 40 is press-fitted and fixed to an intermediate portion of the operation shaft 30, and has lock gears 21, 22, 2,
3 formed on the cam surfaces 21c, 22c, and 23c, respectively.
And a cam surface 41 which can be engaged with the cam surface. The cam surfaces 41 are formed at intervals of 120 degrees.
a, 41b and 41c.

The cam surfaces 21c, 2 of the lock gears 21, 22
The cam surfaces 41a and 41b corresponding to 2c are formed in the same shape, and the cam surface 41c corresponding to the cam surface 23c of the lock gear 23 is formed in an arc shape centering on the axis of the operation shaft 30.

On the side surface of the cam-shaped plate 40 on the machine frame 10 side, three mounting projections 42 are provided on the circumference centered on the axis of the operation shaft 30 at intervals of 120 degrees. I have.

The three lock springs 70 are arranged on the inner surface of the machine frame 10 at intervals of 120 degrees on the circumference centered on the through hole 12, and the base thereof is formed on the inner surface of the machine frame 10. The projection 13 is locked. Further, the outer ends of the lock springs 70 are respectively locked by locking portions 43 formed on the outer peripheral surface of the cam-shaped plate 40, and the cam-shaped plate 40 is always counterclockwise in FIG. It is urged to rotate in the direction. FIG.
In FIG. 13, only one lock spring 70 is shown, and the other two are omitted.

The lock release plate 50 has a disk shape and is rotatably fitted in a circular recess 15 formed concentrically at the center of the bottom surface 10a of the machine frame 10, and has a plate thickness of the circular recess. The height is set to be equal to or slightly smaller than the height of 15.

At the center of the lock release plate 50, 1
Three mounting grooves 52 are formed at intervals of 20 degrees, and the three mounting protrusions 42 of the cam-shaped plate 40 are set so as to be loosely fitted in the mounting grooves 52. Thereby, the lock release plate 50 can rotate integrally with the cam-shaped plate 40, that is, the operation shaft 30, and
0 is set so that it can move a little in the radial direction.

On the outer peripheral side of the lock release plate 50,
Actuating projections 21b, 22 of lock gears 21, 22, 23
The three cam grooves 51 which engage with the b and 23b are formed at intervals of 120 degrees. The cam groove 51 is formed in an arc shape centering on the center of the lock release plate 50, and includes a large-diameter loose fitting groove 51a and a small-diameter unlock cam groove 51b.

The wedge member 80 is formed in a disk shape and is disposed between the substantially valley-shaped cam surface 23c of the lock gears 23A and 23B and the cam surface 41C of the cam-shaped plate 40.

When the cam-shaped plate 40 is rotated to operate the lock gears 21, 22, 23 outward, the cam-shaped plate 40 is placed on the substantially valley-shaped cam surface 23c of the lock gears 23A, 23B. The wedge member 80 is pressed against the cam surface 41c, whereby the lock gears 23A and 23B move radially outward to mesh with the internal gear 61 of the lid 60, and
By the component force acting on the cam surface 23C, the lock gear 23A
And 23B are set so as to expand to the left and right, respectively, so that the left and right side surfaces respectively press against the inner side surface of the guide 11.

The arm plate 120 is used for the seat back 1.
It has a mounting portion 121 to the 60 side and holding means 140 for holding the inner portion 131 of the spiral spring 130.

The holding means 140 is provided for the arm plate 1
The arm plate 120 is provided below the 20 through-holes 122 and is formed by cutting and raising the arm plate 120 in a semicircular shape along a locus of a predetermined radius of curvature centered on the center of the through-hole 122. An inner end 132 of the spiral spring 130 is engaged with a concave portion 142 formed on one side end of the cut-and-raised portion 141.
The outer end 133 of the “0” is locked by a locking pin 111 provided on the base plate 110.

In FIG. 6, reference numeral 123 denotes a forward-falling stopper. When the arm plate 120, that is, the seat back 160 is rotated in the front (F) direction, a forward-falling stopper 123 is provided on a locking pin 111 provided on the base plate 110. Abuts, thereby restricting rotation of the seat back 160 in the front (F) direction.

The present invention is not limited to this embodiment, and the arm plate 120 may be attached to the machine frame 10 and the cover 60 may be attached to the seat cushion 150 in a manner opposite to the above structure.

In the vehicle seat reclining device E configured as described above, when the lock mechanism 100 is locked as shown in FIG.
1 and 22 are pressed by the cam surfaces 41a and 41b of the cam-shaped plate 40, respectively.
1a and 22a mesh with the internal gear 61 of the lid 60, respectively.
b and 22b are loosely fitted in the loose fitting grooves 51a of the cam grooves 51 of the lock release plate 50.

The divided lock gears 23A, 23
B is pressed by the cam surface 41c of the cam-shaped plate 40 via the wedge member 80, the external gear 23a is meshed with the internal gear 61, and the lock gears 23A, 23B The operating protrusion 23b is loosely fitted in the loose fitting groove 51a of the cam groove 51 of the lock release plate 50.

When the lock gears 23A and 23B mesh with each other, the substantially valley-shaped cam surface 23c is pressed by the wedge member 80 so that the lock gears 23A and 23B expand right and left and guide 1
1 are pressed into contact with the inner surface.

Thus, the play of the lock gear 23 at the time of locking can be prevented, and the play of the cover 60, that is, the seat back 160 in the circumferential direction can be prevented.

Further, since the wedge member 80 is formed in a disk shape, the lock gear 23 can be easily pressed radially outward and expanded left and right with a simple structure, and the lock mechanism can be easily locked. 100 can be reliably performed.

Further, since the operating surface of the wedge member 80 of the cam surface 41c of the cam plate 40 corresponding to the divided lock gear 23 is formed in an arc shape, the cam plate 4 at the time of locking is formed.
0 regardless of the rotation position of the wedge member 80,
1 and 22 and the cam surfaces 41a and 42a of the cam-shaped plate 40.
1 and 22 are prevented from half-biting, and the lock mechanism 1
00 can be reliably performed.

In order to change from the locked state of the lock mechanism 100 to the unlocked state shown in FIG.
Is rotated clockwise against the urging force of the lock spring 70 in FIG.

Then, the cam surfaces 2 of the lock gears 21 and 22
1c and 22c are disengaged from the cam surfaces 41a and 41b of the cam-shaped plate 40, and the wedge member 80 is disengaged from the cam surface 41c of the cam-shaped plate 40.
The unlocking cam grooves 51 of the cam grooves 51 of the unlocking plate 50 are provided with the operation projections 21 b, 22 b, and 23 b of the unlocking plate 50.
b.

Thus, the lock gears 21, 22, 2
3 moves toward the center, and each of the external gears 21a, 22a, 2
The engagement between the gear 3a and the internal gear 61 is released, the lock of the lid 60 is released, and the arm plate 120 attached to the lid 60 is rotated in the front direction by the urging force of the spiral spring 130.

Returning from the unlocked state to the locked state again is performed by rotating the operation shaft 30 counterclockwise in FIG. 13, and a detailed description thereof will be omitted.

[0055]

According to the first aspect of the present invention, when the plurality of lock gears (20) are operated outward by rotating the cam-shaped plate (40), the divided lock gears (2) are moved.
A wedge member (80) is pressed against the substantially valley-shaped cam surface (23c) of 3), and the lock gear (23) moves radially outward to mesh with the internal gear (61) and to the right and left. Expand and guide the left and right side surfaces of the lock gear (23) (1).
Pressing both sides of 1).

Thus, the play of the lock gear (23) during locking can be prevented, and the play in the circumferential direction of the lid (60) can be prevented.

According to the second aspect of the present invention, since the wedge member (80) is formed in a disk shape, it is easy to press the lock gear (23) radially outward and to expand the lock gear (23) right and left. The structure can be easily performed, and the lock mechanism (10
Operation 0) can be reliably performed.

According to the third aspect of the present invention, the working surface of the wedge member (80) of the cam surface (41c) of the cam plate (40) corresponding to the divided lock gear (23) is formed in an arc shape. Therefore, it is possible to prevent the other lock gears (21, 22) from being half-meshed, and to reliably operate the lock mechanism (100).

[Brief description of the drawings]

FIG. 1 is an explanatory front view showing a lock mechanism in a locked state according to an embodiment of the present invention, with a lock mechanism partially removed;

FIG. 2 is an explanatory sectional view taken along the line II-II of FIG.

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 along a line VV in FIG. 4;

FIG. 6 is an explanatory view taken along the line VI-VI in FIG. 5;

FIG. 7 is an explanatory front view of the machine frame.

FIG. 8 is an explanatory front view of the divided lock gear.

FIG. 9 is an explanatory front view of the cam-shaped plate.

FIG. 10 is an explanatory front view of the lock release plate.

FIG. 11 is an explanatory front view of the arm plate.

12 is an explanatory view taken in the direction of arrows XII-XII in FIG. 11;

FIG. 13 is an explanatory front view showing the lock mechanism in the unlocked state with a part removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Machine frame 11 Guide 14 Circular recess 20 Lock gear 21 Lock gear 22 Lock gear 23 Lock gear 23A Divided lock gear 23B Divided lock gear 23c Approximately mountain-shaped cam surface 30 Operation shaft 40 Cam-shaped plate 41 Cam surface 50 Lock release plate 60 Lid 61 Internal gear 80 Wedge member 100 Lock mechanism 110 Base plate 120 Arm plate 150 Seat cushion 160 Seat back E Vehicle seat reclining device

Claims (3)

[Claims] 1. A lid (60) that covers an inner surface side of a circular recess (14) formed in a disk-shaped machine frame (10) and that rotates along an inner peripheral surface of the machine frame (10). A plurality of lock gears (20) normally arranged in the machine frame (10) via a guide (11) and an internal gear (61) formed on the inner peripheral surface of the lid (60). , The mutual rotation between the machine frame (10) and the lid (60) is prevented, and the operating shaft (30) provided to be loosely fitted to the machine frame (10) and the lid (60). ) Is rotated to form a cam plate (40) integrated with the operation shaft (30) and the cam plate (4).
0), the plurality of lock gears (20) are pulled toward the center through a lock release plate (50) driven by the lock to release the lock, and the machine frame (10) and the lid (6) are released.
0), and a lock mechanism (100) configured to liberalize mutual rotation with the machine frame (10) and the lid (6).
0) is mounted on the seat cushion (150) side and the other is mounted on the seat back (160) side, wherein the vehicle seat reclining device (E) comprises: a plurality of lock gears (20); The one lock gear (23) is radially divided and a substantially valley-shaped cam surface (23c) inclined toward the divided surface is formed. Further, the substantially valley-shaped cam surface (23c) and the cam are formed. A wedge member (80) is arranged between the plate and the plate (40);
The cam-shaped plate (40) presses the wedge member (80) and is pressed against the substantially valley-shaped cam surface (23c) of the divided lock gear (23). The vehicle is characterized in that it moves to the right and engages with the internal gear (61) and expands left and right to press the left and right side surfaces of the lock gear (23) against both side surfaces of the guide (11), respectively. Seat reclining device. 2. The vehicle seat reclining device according to claim 1, wherein said wedge member is formed in a disk shape. 3. Each cam surface (4) of said cam plate (40).
In 1), the operating surface of the wedge member (80) of the cam surface (41c) corresponding to the divided lock gear (23) is
The vehicle seat reclining device according to claim 1, wherein the operation shaft (30) is formed in an arc shape centered on an axis of the operation shaft (30).