JP2000189267A - Recliner for vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the play of a seat recliner for a vehicle seat of an internal tooth type. SOLUTION: This recliner for the vehicle seat of the internal tooth type is provided with a cam member 19 turnable within a prescribed angle by an operation lever 29 around a center shaft 2 which is the turning center of a base plate 1 and a tooth plate and a tooth member 11 abutted to the cam member 19 and movable back and forth along guide parts 12 and 13. In this case, the guide parts 12 and 13 are composed of a pair of guide surfaces 12a and 13a inclined and formed parallelly to both side end faces of the tooth member 11 at the time of locking, both side end parts of the tooth member 11 are respectively slidably clamped by the guide surfaces 12a and 13a and the cam member 19 moves the tooth member 11 and engages the tooth part 7 of the tooth plate with the tooth part 10 of the tooth member 11 at the time of locking. Also, by the engagement, the tooth member 11 is inclined and both side end parts of the tooth member 11 are respectively abutted to the guide surfaces 12a and 13a.

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 teeth portions 44 and 45 (see 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] In view of the above circumstances, an object of the present invention is to prevent the occurrence of backlash in an internal-tooth-type sheet recliner.

[0006]

According to a first aspect of the present invention, a recliner for a vehicle seat according to the present invention includes a tooth plate rotatably supported by a center shaft of a base plate with a center shaft as a center. A fan-shaped concave portion having a predetermined radius is formed, a tooth portion is formed on an inner peripheral surface of an arc portion of the concave portion, and a tooth member having a tooth portion engaging and disengaging from the tooth portion is formed on the base plate by a guide portion comprising a pair of guide surfaces A recliner for a vehicle seat, wherein a cam member for movably engaging in a radial direction via a shaft and a cam member for moving the tooth member is axially mounted on a base plate, and the cam member is rotatably arranged by an operation lever. In the above, the guide portion comprises a pair of guide surfaces formed in parallel to both end surfaces of the tooth member at the time of locking, and the guide surface of the tooth member is formed on the guide surface. Each side end is slidably held, and at the time of locking, the cam member moves the tooth member to mesh the tooth portion of the tooth plate with the tooth portion of the tooth member, and the tooth member is inclined by this engagement. The two end portions of the tooth member are brought into contact with the pair of guide surfaces, respectively.

Therefore, when the operating lever is rotated upward, the cam member rotates to move the tooth member in the radial direction on the center shaft side along the guide portion, thereby releasing the meshing of the teeth. Reclining adjustment
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 in the radial direction on the tooth portion side via the guide portion. The teeth are engaged to lock the set inclination angle.

At the time of locking, the tooth portion of the tooth member meshes with the tooth portion of the tooth plate. At this time, both end surfaces of the tooth member are formed so as to be inclined with respect to the pair of guide surfaces. When the cam member presses the tooth member, the tooth member rotates by the clearance with respect to the pair of guide surfaces, and is locked in a state where both end surfaces of the tooth member abut against the guide surfaces at the diagonal positions. Will be retained.

[0009]

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.

A tooth member 11 having an upper edge formed with a tooth portion 10 meshing with the tooth portion 7 is housed in the recess 6 of the tooth plate 3 sandwiched between the base plate 1 and the tooth plate 3. Guide portions 12 and 13 formed of convex portions or concave portions having guide surfaces 12a and 13a for guiding sliding in the radial direction across the base plate 1 are formed on the base plate 1.

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. A cam surface 11a is formed on the opposite end of the tooth portion 10, and the arm portion 14 is provided on a side of the cam surface 11a in the backward tilt rotation direction. The guide surfaces 12a and 13a are inclined rearwardly shifted from the center of the arcuate tooth portion 7, and the tooth member 11 is guided by the guide surfaces 12a and 13a and shifts in the rearwardly rotating direction in the radial direction. Slide. Thereby, the tooth plate 3
From this, the load in the rotational direction acting via the tooth member 11 is dispersed, the load that pushes down the tooth member 11 in the radial direction increases, and the load that acts on the guide surface 13a from the tooth member 11 decreases.

A cam member 19 for sliding the 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 so that the base plate 1 is non-rotatably engaged with a deformed section 24 provided on the side of the flange 22. After the 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 engaged with a pin 28 projecting outward from the tooth plate 3 and projecting outward. It has stopped. Therefore, the 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 protruding 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 the 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.

Accordingly, 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 positioned below the arm 14 and is locked.

In the embodiment of the present invention, FIG.
As shown in (1), a projection 11c that can contact the cam member 19 is integrally formed on the tooth member 11. The projecting portion 11c is formed on the side in the forward tilting rotation direction facing the arm portion 14 and protrudes forward from the guide surface 12a of the guide portion 12 in the forward tilting rotation direction. The cam surface 11a with which the first step 15 of the member 19 engages
Is provided.

Thus, at the time of locking, the cam member 19 is locked.
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 second embodiment shown in FIG. 5 will be described. In this example, the tooth member 11 is moved with respect to the moving direction X of the tooth member 11 as the guide surfaces 12a and 13a of the guide portions 12 and 13. Are inclined at a predetermined angle θ in the forward tilt rotation direction of the arm 5 and are formed in parallel. 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 teeth are disengaged, the tooth member 11 moves with a clearance between the guide members 12a and 13a, and when the teeth 10 and 7 are engaged with each other, the teeth 7 of the tooth member 11 are disengaged. It is set so as to mesh with the teeth in the backward tilt rotation direction.

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 second embodiment, when a person sits 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 even if the tooth member 11 is to be rotated via the teeth 7 and 10, both side surfaces of the tooth member 11 are on the guide surface 12.
a, 13a, so that they cannot move. Therefore, rattling when a person sits on the seat device and a load is applied to the seat back is eliminated.

[0029]

According to the present invention described above, 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 of the first embodiment.

FIG. 5 is a front view of a main part showing a second 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 14 Arm part 15 First step part 16 Second step part 19 Cam member 23 Operation lever 23a Slot

Claims (1)

[Claims] 1. A fan-shaped recess having a predetermined radius centered on a center shaft is formed in a tooth plate rotatably supported on a center shaft of a base plate, and a tooth portion is formed on an inner peripheral surface of an arc portion of the recess. A cam member that movably engages a tooth member having a tooth portion that engages with and disengages from the tooth portion with the base plate via a guide portion including a pair of guide surfaces, and that moves the tooth member. A vehicle seat recliner in which the cam member is rotatably arranged by an operation lever, wherein the guide portion is formed to be inclined and parallel to both end surfaces of the tooth member when locked. A pair of guide surfaces, and both end portions of the tooth member are slidably held between the guide surfaces, and the cam member moves the tooth member when locked. The toothed portion of the tooth plate and the toothed portion of the tooth member are meshed with each other, and the tooth member is inclined by this meshing so that both end portions of the tooth member abut on the pair of guide surfaces. Recliner for seat.