JP2001204572A - Vehicle seat reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce load acting on each guide surface from a tooth member by dispersing load exerted from a tooth plate via the tooth member in the direction of rotation. SOLUTION: This device has a cam member 19 capable of being rotated by means of an operating lever 29 within a predetermined angle about a center shaft 2 which serves as the center of rotation of a baseplate 1 and the tooth plate 3, and the tooth member 11 capable of moving back and forth radially along the guide surfaces 12a and 13a of the guide parts 12 and 13 on abutting against the cam member. Both guide surfaces are formed to incline backwardly away from the center of the arcuate tooth part 7 of the tooth plate to cause sliding of the tooth member in a direction backwardly away from the center of the arcuate tooth part 7 of the tooth plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat reclining device, and more particularly to a vehicle seat recliner known as an internal gear system.

[0002]

2. Description of the Related Art A seat reclining device is a seat device in which the inclination angle of a seat back can be set to a desired value within a predetermined range for the purpose of securing a safe driving posture of a driver and comfortable seating.

Conventionally, as shown in FIG. 6, sectors 42, 43 centering on a center shaft 41 are formed on an arm 40 fixed to a seat back, and locking teeth 44, 45 are provided on the inner peripheral surface thereof. Guide portions 47 and 48 are formed on a base plate 46 fixed to a seat cushion, and a lock plate 49 that slides the guide portions 47 and 48 in the radial direction is disposed on one side surface of the base plate 46. The pin 50 is protruded and the pin 5
By rotating the control plate 52 having the cam hole 51 with which the lock plate 0 engages with the operation lever 53, the lock plates 49, 49 move in the radial direction, and the locking teeth 5
The control plate 52 is provided with a pressing piece 56 fixed to the lock plate 49 so as to be able to engage or disengage with the locking tooth portions 44 and 45 (Japanese Utility Model Publication No. 53-53). No. 15529).

[0004]

However, according to the seat recliner of the internal tooth system, the lock plates 49, 49 are guided by the guide portions 47, 48 so as to be slidable in the radial direction. , 48 and the lock plates 49, 49 are always provided with a clearance, and the lock plate 49 can be moved by the clearance even during locking, so that there is a problem that a backlash is generated in the seat back.

[0005]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned conventional vehicle seat recliner, and the invention according to claim 1 is rotatably supported on a base plate. A tooth having a predetermined radius centered on the rotation center of the tooth plate is formed in the tooth plate, and a tooth portion is formed on an arc-shaped inner peripheral surface of the concave portion, and the tooth engages with and disengages from the arc-shaped tooth portion. A tooth member having a portion is movably engaged with the base plate in a substantially radial direction via a guide portion including a pair of guide surfaces, and a cam member for moving the tooth member is axially attached to the base plate. In a vehicle seat recliner having a cam member rotatably arranged by an operation lever, the tooth member moved and guided by the two guide surfaces is moved from a center of an arc-shaped tooth portion of the tooth plate. It is characterized in that so as to move in the direction shifted toward.

Therefore, when the operation lever is turned upward, the cam member turns to move the tooth member radially along both guide surfaces of the guide portion, thereby releasing the meshing of the teeth. After setting the desired inclination angle of the seat back, that is, the tooth plate, when the operating lever is released, the cam member rotates in the opposite direction, and the tooth member moves through the guide portion to the diameter of the tooth portion side. By moving in the direction, both teeth mesh with each other to lock at the set inclination angle.

When the tooth member moves in the radial direction, the tooth member slides in the radial direction while being displaced in the backward tilting direction while being guided by the two guide surfaces, so that the tooth member acts from the tooth plate at the time of locking via the tooth member. The load in the rotating direction is dispersed, and the load for pushing the tooth member in the radial direction increases, whereby the load acting on each guide surface from the tooth member decreases.

The invention according to a second aspect is characterized in that the two guide surfaces are formed so as to be inclined rearwardly from the center of the arcuate teeth of the tooth plate.

According to a third aspect of the present invention, a cam surface is formed at one end of an inner peripheral surface of the tooth member opposite to the tooth portion, while an inner peripheral surface of the tooth member of the cam member is provided. A state in which a first stepped portion that engages with the cam surface is formed substantially at the center or one end of the outer peripheral surface facing the above, and the two teeth are engaged with and locked to the other end of the outer peripheral surface. 5. The invention according to claim 4, wherein a second step portion is formed to abut on the other end of the inner peripheral surface when a predetermined load or more in the rotation direction acts on the guide portion. In the locked state, both side surfaces of the tooth member are formed so as to be inclined by a predetermined angle with respect to the both guide surfaces in the front rotation direction of the base plate.

As described above, at the time of locking, the teeth of the tooth member mesh with the teeth of the tooth plate. At this time, both end surfaces of the tooth member are formed to be inclined with respect to the pair of guide surfaces. Therefore, when the cam member presses the tooth member, the tooth member rotates by a clearance with respect to the pair of guide surfaces, and both end surfaces of the tooth member abut against the guide surfaces at diagonal positions thereof. The lock is held in the locked state.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 relate to a basic structure of a vehicle seat recliner embodying the present invention. A tooth plate 3 is rotatable via a center shaft 2 to a base plate 1 fixed to a vehicle body via a seat slide device (not shown). Axle-mounted. Tooth plate 3
Is connected to an arm 5 via a pin 8 inserted into the connection hole 4, and the arm 5 is fixed to a side surface of a seat back (not shown). Note that the tooth plate 3 may be directly fixed to the side surface of the seat back without using the arm 5.

On the inner surface side of the tooth plate 3, a concave portion 6 having a predetermined radius centering on the center shaft 2 is formed by embossing or the like, and a tooth portion 7 is formed on the arc-shaped inner peripheral wall of the concave portion 6 in a normal way. Have been. A pressing member 9 is fastened to the upper end of the tooth plate 3 together with the arm 5 by a pin 8 inserted into the connecting hole 4. The holding member 9 forms an arc portion 1b of a predetermined radius around the center shaft 2 at the upper edge of the base plate 1 so that the tooth portion 7 and the base plate 1 do not peel off, and the holding member holds the upper edge. are doing. Instead of providing the holding member 9, the head of the pin 8 may be expanded, and the peripheral edge of the arc portion 1b of the base plate 1 may be sandwiched by the expanded head of the pin.

Further, the base plate 1 is formed with guide portions 12 and 13 formed of convex portions or concave portions having a pair of guide surfaces 12a and 13a, and a tooth member 11 is provided between the two guide surfaces 12a and 13a. It is provided slidably in the radial direction.

That is, the tooth member 11 is slidably guided in the radial direction between the guide surfaces 12a and 13a while being held in the recess 6 of the tooth plate 3 while being sandwiched between the base plate 1 and the tooth plate 3. In addition, a tooth portion 10 that can mesh with the tooth portion 7 of the tooth plate 3 is formed on the outer peripheral surface.

The tooth member 11 is provided on the guide portion 1.
2 and 13 and an arm 14 intersecting therewith and projecting obliquely in a clockwise direction.
A cam surface 11a is formed on the inner circumference on the opposite side of the cam surface 11a, and the arm portion 14 is provided on a side portion of the cam surface 11a in the backward tilt rotation direction.

Further, the tooth member 11 has a side portion parallel to the guide portions 12 and 13 and an arm portion 14 crossing the side portion and projecting obliquely in a clockwise direction. And tooth part 1
A cam surface 11a is formed on the opposite end of the cam surface 11a, and the arm portion 14 is provided on a side of the cam surface 11a in the backward tilt rotation direction.

Further, the guide surfaces 12a and 13a are formed to be inclined from the center of the arcuate tooth portion 7 toward the rear side, so that the tooth member 11 is provided on the guide surface 1a.
It is guided by 2a and 13a and slides in the radial direction while shifting in the backward tilt rotation direction. Thereby, the load in the rotational direction acting from the tooth plate 3 via the tooth member 11 is dispersed, the load pushing the tooth member 11 in the radial direction increases, and the load acting on the guide surface 13a from the tooth member 11 decreases. .

Cam member 19 for sliding tooth member 11
Are housed in the recess 6 and the recess 1 a of the base plate 1 so as to be rotatable about the center shaft 2 between the base plate 1 and the tooth plate 3. The cam member 19 is formed on the cam surface 1 formed on the tooth member 11.
A first step portion 15 that engages with the first portion 1a and a second step portion 16 that has a predetermined gap with the lower surface of the arm portion 14 and that can abut when a load is applied are formed. I have.

The center shaft 2 has a flange 22 and is inserted from the base plate 1 side to engage the base plate 1 with a modified cross-section 24 provided on the side of the flange 22 so as to be non-rotatable. After the lever 23, the cam member 19 and the tooth plate 3 are sequentially inserted, the washer 38 is inserted and the outside thereof is caulked and fixed. A connection pipe 25 is fitted to the end of the center shaft 2 on the base plate side.

An inner end of a spiral spring 27 is locked to the other end of the center shaft 2, and an outer end of the spiral spring 27 is provided on a pin 28 projecting outward from the tooth plate 3 and projecting outward. It is locked. Therefore, tooth plate 3
Is always urged to rotate forward.

A link 29 is fixed to the end of the connecting pipe 25 by welding or the like, and a notch groove 30 is provided at the end of the link, and a pin 31 projecting from the cam member 19 is provided in the notch groove 30. Of the center shaft 2 through the cam member 19 which rotates together with the operation lever 23 by penetrating and engaging the long hole 32 formed in the base plate 1.
, The connecting pipe 25 is rotated, and the other seat reclining device is interlocked. In other words, the other internal reclining double-sided seat reclining device is interlocked.

The operation lever 23 has a hole 34 formed near the center shaft 2, and an embossed portion 33 fitted in the hole 34 is formed on the cam member 19 and fitted.
Therefore, the operation lever 23 and the cam member 19 can rotate integrally. The operating lever 23 is engaged with the center shaft 2 at an irregular cross section such as an oval shape with the cam member 19,
These may rotate integrally.

A knob 35 is mounted on a free end of the operation lever 23. A long hole 23 a is formed in the other end of the operation lever 23, and the protrusion 11 is formed in the tooth member 11 by embossing.
b is inserted into the long hole 23a. After the cam member 19 is disengaged from the cam surface 11a of the tooth member 11, the elongated hole 23a engages with the protrusion 11b to forcibly move the tooth member 11 in the radial direction. One end of a return spring 36 is locked to the operation lever 23, and the other end of the return spring 36 is locked to a pin 37 protruding from the base plate 1.

Although the operation lever 23 and the cam member 19 are pivotally supported on the same center shaft 2 as the tooth plate 3, the operation lever 23 and the cam member 19 may be pivotally mounted at positions other than the center shaft. The operation lever 23
And the cam member 19 may be supported on separate shafts.

The operating lever 23 is moved to the base plate 1
Although the operation lever 23 is disposed between the tooth plate 3 and the tooth plate 3, the operation lever 23 may be disposed outside the tooth plate 3. In this case, the embossed portion 33 and the protrusion 11 b are formed on the tooth plate 3 as pins or the like. The rotation of the operation lever 23 may be transmitted to the cam member 19 and the tooth member 11 by projecting from the long hole and passing through the hole 34 of the operation lever 23 and the long hole 23a.

Next, this operation will be described.
3 against the force of the return spring 36 and the center shaft 2
When the cam member 19 rotates in the clockwise direction about the center, the cam member 19 also rotates clockwise, the second step 16 moves away from the lower part of the arm portion 14 of the tooth member 11, and the first step 15 The tooth 11 is disengaged from the cam surface 11a of the member 11, and the protruding portion 11b of the tooth 11 is pushed down by the elongated hole 23a of the operating lever 23 and guided by the guides 12 and 13, whereby the teeth 7 and 10 mesh. It is released.

Therefore, the tooth plate 3 rotates in the forward falling direction by the force of the spiral spring 27. Then, when the seat back is pushed rearward to determine its inclination angle and the operation lever 23 is released, the operation lever 23 is actuated by the force of the return spring 36.
Is returned to the original position, the cam member 19 rotates counterclockwise, the first step portion 15 slides on the cam surface 11a of the tooth member 11, and the tooth member 11 is moved to the guide portions 12, 1.
Tooth part 1 by pushing up while guiding at 3
At the same time, the second step 16 is located below the arm 14 and is locked.

In the second embodiment of the present invention,
As shown in FIG. 4, a projection 11 c capable of contacting the cam member 19 is integrally formed on the tooth member 11. This protrusion 11
c is formed on the side in the forward tilt rotation direction facing the arm portion 14 and protrudes forward from the guide surface 12a of the guide portion 12 in the forward tilt rotation direction. The cam member 19 is provided on the lower surface of the protrusion 11c. The cam surface 1 with which the first step 15 is engaged
1a is provided.

Thus, at the time of locking, the cam member 19
The first step 15 engages with the cam surface 11a of the tooth member 11 and presses the protrusion 11c, so that the tooth member 11 is brought into contact with the corner 12b of the guide 12.
Rotation is performed by the clearance with the base of 1c as a fulcrum, and the opposite side of the tooth member 11 is locked and held in contact with the guide surface 13a of the guide portion 13.

Therefore, when a person is seated on the seat device and a load is applied to the seat back, the load is applied to the arm 5.
When the tooth member 11 is input to the tooth plate 3 via the teeth and tries to rotate the tooth member 11 via the teeth 7 and 10, the tooth member 11 is guided by the guide surfaces 12 a and 13 of the guide portions 12 and 13.
The tooth members 11 cannot rotate since they are held in contact with the respective members a. In this state, a predetermined gap is set between the arm 14 of the tooth member 11 and the second step 16 of the cam member 19. Therefore, even if a clearance is provided between the tooth member 11 and the guide surfaces 12a and 13a, it is possible to eliminate a situation in which the clearance is recognized as a backlash by the occupant.

The third embodiment shown in FIG. 5 will be described. In this example, the tooth member 11 is moved in the moving direction X of the tooth member 11 as the guide surfaces 12a and 13a of the guide portions 12 and 13. 11 are formed in parallel at a predetermined angle θ in the direction of forward rotation of the arm 5. That is, when the tooth portions 7 of the tooth plate 3 and the tooth portions 10 of the tooth member 11 are engaged, the guide surfaces 12a and 13a are inclined by an angle θ with respect to both side surfaces of the tooth member 11, so that the tooth member 11 Are held in contact with the guide surfaces 12a and 13a, respectively.
When the tooth 7 is disengaged, the tooth member 11 moves with a clearance between the guide member 12a and the guide surface 13a.
Are set so as to mesh with the teeth of the tooth portion 7 of the rearward rotation direction side.

It is sufficient that the angle θ is as small as about 1 degree.
Further, the tooth member 1 is moved with respect to the moving direction of the tooth member 11.
1 may be formed in parallel with the arm 5 inclined at a predetermined angle θ in the backward tilt rotation direction. Therefore, when the tooth member 11 moves in the radial direction and the tooth portions 10 and 7 mesh with each other, a substantially triangular gap is formed on each of the guide surfaces 12a and 13a. Note that, in this state as well, a predetermined gap is set between the arm portion 14 of the tooth member 11 and the second step portion of the cam member 19. Other configurations are the same as those of the first embodiment, and the same portions are denoted by the same reference numerals and overlapping description will be omitted.

Therefore, in the third embodiment, when a person is seated on the seat device and a load is applied to the seat back, the load is input to the tooth plate 3 via the arm 5 and the teeth 7, 7, When the tooth member 11 is to be rotated through the support member 10, both side surfaces of the tooth member 11
Since they are in contact with 2a and 13a, they cannot move. Therefore, rattling when a person sits on the seat device and a load is applied to the seat back is eliminated.

[0034]

As is apparent from the above description, claim 1
According to the inventions described in (1) and (2), the tooth member slides in the radial direction while being displaced in the backward tilt rotation direction while being guided by the guide surface during the radial movement, so that the tooth member acts from the tooth plate via the tooth member. The load in the rotating direction is dispersed, the load pushing the tooth member in the radial direction increases, and the load acting on each guide surface from the tooth member decreases.

According to the third aspect of the present invention, when a large load exceeding a predetermined amount is generated rearward in the seat back in the locked state, the cam surface on one end and the other end of the inner peripheral surface of the tooth member are provided on the cam member. The first step portion and the second step portion of the member are in contact with each other, and the tooth member is supported at two points. For this reason,
The load on each guide surface can be reduced.

According to the fourth aspect of the present invention, when the seat back is locked, the tooth member is inclined with respect to the guide surface, so that the tooth member can be prevented from moving in the guide portion. Does not swing and no backlash occurs.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a sectional side view of FIG.

FIG. 3 is a front view of a main part of FIG. 1;

FIG. 4 is a front view of a main part showing a second embodiment of the present invention.

FIG. 5 is a front view of a main part showing a third embodiment of the present invention.

FIG. 6 is a front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base plate 2 ... Center shaft 3 ... Tooth plate 5 ... Arm 6 ... Concave part 7, 10 ... Tooth part 11 ... Tooth member 11b ... Projection part 11c ... Projection part 12, 13 ... Guide part 12a, 13a ... Guide surface 12b ... Corner Corner part 14 ... Arm part 15 ... First step part 16 ... Second step part 19 ... Cam member 23 ... Operation lever 23a ... Elongated hole

Claims (4)

[Claims] A tooth plate rotatably supported by a base plate is formed with a concave portion having a predetermined radius centered on the rotation center of the tooth plate, and a tooth portion is formed on an arc-shaped inner peripheral surface of the concave portion. A tooth member having a tooth portion that engages with and disengages from the arc-shaped tooth portion is movably engaged with the base plate through a guide portion including a pair of guide surfaces in a substantially radial direction, and In a vehicle seat recliner in which a cam member for moving a tooth member is pivotally mounted on a base plate and the cam member is rotatably arranged by an operation lever, the tooth member moved and guided by the two guide surfaces is provided. A recliner for a vehicle seat, wherein the tooth plate is moved rearward from a center of an arcuate tooth portion of the tooth plate. 2. The recliner for a vehicle seat according to claim 1, wherein the two guide surfaces are formed to be inclined from the center of the arcuate teeth of the tooth plate toward the rear side. 3. A cam surface is formed at one end of an inner peripheral surface of the tooth member opposite to the tooth portion, and an outer peripheral surface of the cam member opposed to the inner peripheral surface of the tooth member is substantially formed. A first stepped portion is formed at the center or at one end to engage with the cam surface, and at the other end of the outer peripheral surface, the two teeth are engaged with each other and locked in the guide portion in a rotational direction. The recliner for a vehicle seat according to claim 1 or 2, wherein a second stepped portion is formed to abut on the other end of the inner peripheral surface when a predetermined load or more is applied. 4. The locking member according to claim 1, wherein both side surfaces of the tooth member in the locked state are formed to be inclined by a predetermined angle in a front rotation direction of the base plate with respect to the both guide surfaces. A recliner for a vehicle seat according to any one of the above.