JPH09234132A - Recliner for vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the reduction in the strength of a seat recliner and also the occurrence of feeling of backlash by abutting the arm part of a tooth member on the second stepped part when a load is applied to a tooth plate at the time of lock, and by holding the tooth member at two points together with a first stepped part in which a cam member has been engaged with the cam surface of the tooth member. SOLUTION: In a cam member 19, a tooth member 11 is formed on the upper end periphery of a tooth part 10 that engages with a tooth part 7; and both a first stepped part 15 that engages with the cam surface 11a (not shown) formed on the tooth member 11, and a second stepped part 16 that normally has a prescribed clearance between the undersurface of the arm part 14 which has been provided to the tooth member 11 and itself, and that is abuttable when a load is applied are formed. At the time of lock, when a load is applied to the tooth part 3, the arm part 14 of the tooth member 11 is abutted on the second stepped part 16, and the cam member 19 holds the tooth member 11 at two points together with the first stepped part 15 that has been engaged with the cam surface of the tooth member 11. Thus, the reduction in the strength of a seat recliner and also the occurrence of feeling of backlash can be prevented.

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. 9, sectors 42 and 43 centering on a center shaft 41 are formed in an arm 40 fixed to a seat back, and locking teeth portions 44 and 45 are provided on the inner peripheral surface thereof. Guide portions 47 and 48 are formed on the base plate 46 fixed to the seat cushion, and a lock plate 49 that slides the guide portions 47 and 48 in the radial direction is arranged on one side surface of the base plate 46. Pin 50 is projected and 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 above-mentioned internal tooth type seat recliner, if a rearward tilt load is applied to the seat back at the time of a rear collision of the vehicle, as shown in FIG.
As shown in, the lock plate 49 tries to rotate by the force F with the contact point A with the pressing piece 56 as a fulcrum.

Therefore, the rearward load is concentrated and acts on the outer peripheral portion of the contact surface of the guide portion 47 that guides the lock plate 49, and the outer portion of the contact surface of the guide portion 47 is crushed by the load. However, the engagement between the engaging tooth portions 44 and 54 is deviated, which leads to a decrease in strength. This is the same even in the case of a frontal collision of the vehicle, and is caused by the weight of the seatback and the front seat occupant colliding with the seatback, and a forward lean load is applied to the seatback.

Further, a clearance is always provided between the guide portion 47 and the lock plate 49, and the lock plate 49 can move by the clearance even when locked, which causes a backlash feeling in the seat back. was there.

In view of the above circumstances, an object of the present invention is to prevent both the reduction in strength and the occurrence of rattling of the internal tooth type seat recliner.

[0008]

A vehicle seat recliner according to the present invention has a tooth plate centered on a tooth plate pivotally supported on a center shaft of a base plate as described in claim 1. A tooth-shaped member having a fan-shaped concave portion having a predetermined radius, a tooth portion formed on an inner peripheral surface of an arc portion of the concave portion, and a tooth member having a tooth portion engaged with and disengaged from the tooth portion is formed on the base plate by a guide portion including a pair of guide surfaces. Vehicle seat recliner in which a cam member that is movably engaged in the radial direction via a shaft is pivotally mounted on a base plate, and the cam member is rotatably arranged by an operation lever. In the above, the cam member has a first step portion that engages with the cam surface of the tooth member, and a second step portion that is formed so as to be capable of contacting an arm portion provided on the tooth member. At this time, when a load is applied to the tooth plate, the arm portion of the tooth member comes into contact with the second step portion, so that the cam member and the first step portion engaging with the cam surface of the tooth member form two tooth members. It is characterized by holding at.

Therefore, when the operation lever is rotated upward, the cam member is rotated and the first step portion is moved to the arm portion of the tooth member, and the elongated hole of the operation lever moves the tooth member along the guide portion. By moving the lever in the radial direction, the meshing of the teeth can be released to adjust the reclining, and after setting the desired inclination angle of the seat back, that is, the tooth plate, the cam lever rotates in the opposite direction when the operating lever is released. Since the first step moves to the cam surface of the tooth member while contacting the arm part, the tooth member moves in the radial direction via the guide part, so that the tooth part meshes with the tilt angle set. Lock.

When a load is applied to the seat back and the arm and the tooth plate try to rotate at this locking time, the tooth member tries to rotate about the contact point with the cam member as a fulcrum, but the arm portion of the tooth member cams. Since the tooth member is held in contact with the second step portion of the member at two points, the tooth member moves parallel to the guide surface, and the load input to the guide portion is averaged over the entire guide surface. It is possible to reduce the amount of meshing of the tooth portions.

Further, as described in claim 4, a tooth plate rotatably supported by the center shaft of the base plate is formed with a fan-shaped recess centered on the center shaft and having a predetermined radius. A tooth member is formed on the inner peripheral surface of the arc portion, and a tooth member having a tooth portion that engages with and disengages from the tooth portion is movably engaged with the base plate via a guide portion formed of 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 in which the cam member is rotatably arranged by an operating lever, the cam member includes a first step portion that engages with a cam surface of the tooth member, and an arm portion provided on the tooth member. Has a second step portion formed so as to be able to contact with the tooth member, and a third step portion formed so as to be capable of contacting the protrusion provided on the tooth member, and a rearward tilt load is applied to the tooth plate when locked. In this case, the arm portion of the tooth member comes into contact with the second step portion, and when a forward tilt load is applied to the tooth plate when locked, the projection portion of the tooth member comes into contact with the third step portion, whereby the cam is formed. It is characterized in that the member holds the tooth member at two points together with a first step which engages the cam surface of the tooth member.

Therefore, according to the present invention, the same effect as that of the first aspect of the invention can be obtained in the case of a rear collision of the vehicle, and the weight of the seat back and the rear seat occupant can be obtained in the front collision of the vehicle. When a forward tilt load is applied due to the collision of the teeth, the protrusion of the tooth member abuts the third step of the cam member, which prevents the guide part on the forward tilt side from being pressed and crushed. Prevent damage to parts.

[0013]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, a tooth plate 3 is rotatably attached to a base plate 1 fixed to a vehicle body via a seat slide device (not shown) via a center shaft 2. An arm 5 is connected to the tooth plate 3 via a pin 8 inserted through 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 is formed around the center shaft 2 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 manner. Has been done. 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 separate, and the upper edge is held by the holding member. 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 a tooth portion 10 that meshes with the tooth portion 7 formed at the upper end edge is housed in a recess 1a formed in the base plate 1 so that one surface of the base plate 1 is slidable, and at the same time, the tooth member 11 and the tooth are formed. A guide portion 12 formed of a convex portion or a concave portion that is sandwiched by the plate 3 and housed in the concave portion 6 of the tooth plate 3 and that has guide surfaces 12a and 13a that slide guides in the radial direction with the tooth member 11 interposed therebetween. , 13 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 that intersects with the side portion and that is obliquely projected in the clockwise direction.

In the tooth member 11, a cam surface 11a is formed at the end portion on the opposite side of the tooth portion 10, and an arm portion 14 is provided on the side portion of the cam surface 11a in the backward tilt rotation direction. Also,
The guide surfaces 12a, 13a are inclined rearward from the center of the arcuate tooth portion 7, and the tooth member 11 is guided by the guide surfaces 12a, 13a and slides in the radial direction while being displaced in the rearward rotation direction. To do. As a result, the load in the rotational direction that acts from the tooth plate 3 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 portion 22 which is inserted from the side of the base plate 1 and engages the base plate 1 with a deformed cross-section portion 24 provided on the side portion of the flange portion 22 in a non-rotatable manner. 23, the cam member 19 and the tooth plate 3 are sequentially inserted, and then 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.

The inner end of the spiral spring 27 is locked to the other end of the center shaft 2, and the outer end of the spiral spring 27 is engaged with a pin 28 protruding from the tooth plate 3 and protruding 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. Through the long hole 32 formed in the base plate 1 to engage with the link lever 29 via the cam member 19 which rotates together with the operation lever 23.
, 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 operating lever 23 has a hole 34 formed in the vicinity of the center shaft 2, and an embossed portion 33 fitted into the hole 34 is formed on the cam member 19 and fitted together.
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 attached to the free end of the operating 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 in 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.

In this embodiment, the operating lever 23
And the cam member 19 are pivotally supported on the same center shaft 2 as the tooth plate 3, but the operation lever 23 and the cam member 1 are supported.
The shaft 9 may be mounted on a position other than the center shaft, or the operation lever 23 and the cam member 19 may be supported on separate shafts.

Further, in this embodiment, the operating lever 2
3 is arranged between the base plate 1 and the tooth plate 3, the operation lever 23 may be arranged outside the tooth plate 3. In this case, the embossed portion 33 and the projection 1 are provided.
1b is projected as a pin or the like from a long hole formed in the tooth plate 3 and inserted through the hole 34 and the long hole 23a of the operation lever 23, so that the rotation of the operation lever 23 is changed to the cam member 19.
And to the tooth member 11.

The operation of the above embodiment will be described next. When the operation lever 23 is rotated clockwise about the center shaft 2 against the force of the return spring 36, FIG.
As shown in, the cam member 19 rotates together in the clockwise direction,
The second step 16 moves away from the lower part of the arm portion 14 of the tooth member 11, the first step 15 is disengaged from the cam surface 11a of the tooth member 11, and the protrusion 11b of the tooth member 11 has the protrusion 11b. It is pushed down by engaging with the elongated hole 23a and guided by the guide portions 12 and 13 to descend, whereby the meshing of the tooth portions 7 and 10 is released.

Therefore, the tooth plate 3 is rotated forward 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.
Returns to the original position, and as shown in FIG. 4 (A), the cam member 19 rotates counterclockwise to move the first step portion 1
5 slides on the cam surface 11a of the tooth member 11, and pushes upward while guiding the tooth member 11 with the guide portions 12 and 13 so that the tooth portions 10 and 7 mesh with each other and the second step portion 16 includes the arm portion. It is located under 14 and is in a locked state.

When the seat back is loaded and the tooth member 11 tries to rotate in the arrow E direction through the arm 5 and the tooth plate 3 at the time of this locking, the tooth member 11 engages with the cam member 19. Cam surface 11a
However, since the arm portion 14 of the tooth member 11 contacts the second step portion 16 of the cam member 19 to prevent the tooth member 11 from rotating, the tooth member 11 is prevented from rotating.
Tries to move in parallel with the guide surface 13a.

Thus, the tooth member 11 comprises the first step 1
5 and points B and C contacting the second step portion 16 and a point D at the center of meshing of the tooth portions 10 and 7 meshing with each other, forming a substantially triangular force balance 40 and forming a tooth member. 1
Since 1 is held, the strength reduction due to the meshing of the tooth portions 7 and 10 can be prevented, the rear lock strength is improved, and the load input to the guide portion 13 is applied to the guide surface 13a.
You can receive it on average on the whole.

Next, the second embodiment shown in FIG. 5 will be described. In this example, the tooth member 11 and the cam member 19 are provided.
Is integrally formed with the protrusion 11c. The protruding portion 11c is formed on a side portion in the forward tilt rotation direction facing the arm portion 14 and protrudes from the guide surface 12a of the guide portion 12 toward the forward tilt rotation direction. A cam surface 11 a with which the first step portion 15 of the tooth member 11 is engaged is provided.

Therefore, in the second embodiment, when locking, the first step portion 15 of the cam member 19 causes the tooth member 1 to move.
By engaging the cam surface 11 a of No. 1 and pressing the protrusion portion 11 c, the tooth member 11 moves the corner portion 12 of the guide portion 12.
The protrusion 11c that abuts b is rotated about the clearance as a fulcrum, and the side portion on 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, 10, the tooth member 11 is guided by the guide surfaces 12 a, 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.

Further, to explain the third embodiment shown in FIG. 6, in this example, the guide surfaces 12a and 13a of the guide portions 12 and 13 differ from the previous example in the moving direction X of the tooth member 11. On the other hand, the arms 5 are formed parallel to each other with a predetermined angle θ in the forward tilt rotation direction. That is, when the tooth portion 7 of the tooth plate 3 and the tooth portion 10 of the tooth member 11 are engaged with each other, the guide surfaces 12 a and 13 a are inclined with respect to both side surfaces of the tooth member 11 by the angle θ. Part of both sides of the guide surface 12
When the tooth portions 11 and 7 are held in abutment with a and 13a and the tooth portions 10 and 7 are disengaged from each other, the tooth member 11 is fixed to the guide surface 1a.
When the tooth portions 10 and 7 are moved with a clearance between the tooth portions 10 and 7, the tooth portions 7 of the tooth member 11 are set to mesh with the teeth on the backward tilt rotation side.

The angle θ may be as small as about 1 degree.
Therefore, the tooth member 11 moves in the radial direction to move the tooth portion 1.
When 0 and 7 are in mesh with each other, substantially triangular gaps are formed in the guide surfaces 12a and 13a, respectively. 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 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, compared to the first embodiment in which the guide surfaces 12a and 13a are formed in parallel with the side surfaces of the tooth member 11 in the meshing state of the tooth portions 7 and 10, a person is seated on the seat device and a load is applied to the seat back. The feeling of rattling when loaded is eliminated.

Finally, the fourth embodiment shown in FIGS. 7 and 8 will be described. In this example, the tooth member 11 and the cam member 1 are attached.
9 is integrally formed with a protrusion 11d capable of abutting. The protrusion 11d is formed at the lower end in the forward tilt rotation direction facing the arm portion 14 with the cam surface 11a sandwiched between the opposite ends of the tooth portion 10. Further, the cam member 19 has a third step portion 19a on the opposite side of the second step portion 16 with the first step portion 15 interposed therebetween and capable of contacting the lower surface of the protrusion 11d formed on the tooth member 11.
To form The third stepped portion 19a is located below the protruding portion 11d of the tooth member 11 when locked, and has a gap between the third stepped portion 19a and the lower surface of the protruding portion 11d so that it does not always contact. .

Since the other structure is the same as that of the first embodiment, the same parts are designated by the same reference numerals and the duplicated description will be omitted.

Therefore, in the fourth embodiment, when locking, the first step portion 15 of the cam member 19 causes the tooth member 1 to move.
The tooth member 11 is pushed by engaging with the cam surface 11a of No. 1 and is locked by engaging the tooth portions 10 and 7.
Here, by forming the third step portion 19a, the first step portion 15 and the second step portion 1 of the cam member 19 in a stepwise manner, the operating angle of the cam member 19 from lock to unlock is reduced. be able to.

When the vehicle is locked, a rearward load is applied to the seat back due to a collision from the rear of the vehicle, and the arm 5
When the tooth member 11 tries to rotate in the arrow E direction via the tooth plate 3, the tooth member 11 tries to rotate about the cam surface 11a engaging with the first step portion 15 of the cam member 19 as a fulcrum. However, since the arm portion 14 of the tooth member 11 contacts the second step portion 16 of the cam member 19 to prevent the tooth member 11 from rotating, the tooth member 11 moves in a state parallel to the guide surface 13a. try to.

Thus, similarly to the first embodiment, the tooth member 11 meshes with the tooth portions 10 and 7 meshing with the points B and C that contact the first step portion 15 and the second step portion 16. A force balance 40 of a substantially triangular shape formed by the center point D
(See FIG. 4 (A)) is formed to hold the tooth member 11. Therefore, it is possible to prevent the strength from being reduced due to any meshing of the tooth portions 7 and 10, and to improve the rearward locking strength and to input the force to the guide portion 13. The load that is applied can be evenly received by the entire guide surface 13a.

Further, in the case of a collision from the front of the vehicle, the load of the seat back itself or the rear seat occupant collides with the seat back. When the tooth member 11 is input to the tooth plate 3 via the arm 5 and the tooth member 11 is to be rotated in the arrow F direction via the tooth portions 7 and 10, the tooth member 11 is the first step portion 15 of the cam member 19. The cam member 11 engages with the cam surface 11a as a fulcrum, but the protrusion 11d of the tooth member 11 comes into contact with the third stepped portion 19a of the cam member 19 to prevent the rotation.
1 tries to move in a state parallel to the guide surface 12a.

That is, as shown by the alternate long and short dash line in FIG.
The meshing center D of the tooth portions 10 and 7, the contact point B of the cam surface 11a that engages with the first step portion 15, and the third step portion 19a.
In order to hold the tooth portion 11 by forming a triangular force balance 41 connecting the contact points H of the protruding portion 11d that abuts on the tooth portion 11,
The tooth portions 10 and 7 are prevented from being meshed with each other, and the load input to the guide portion 12 can be evenly received by the entire guide surface 12a, so that the front lock strength is improved.

[0042]

According to the present invention described above, according to the invention described in claim 1, when the load is applied to the seat back, the cam member has two points of the first step portion and the second step portion. Since the tooth member can be held by, the load input from the tooth member to the guide portion can be uniformly received on the entire guide surface, and the meshing of the tooth portions can be reduced. Therefore, the lock strength of the internal tooth type vehicle seat recliner is improved.

According to the second and third aspects of the present invention, when the seat back is locked, the tooth member cannot move within the guide portion, so that there is no backlash.

Further, according to the invention as set forth in claim 4, since the cam member can hold the tooth member at two points not only in the case of a rear collision but also in the case of a front collision, it is inputted from the tooth member to the guide portion. The load can be evenly received on the entire guide surface, and the meshing of the tooth portions can be reduced, so that the lock strength is improved.

[Brief description of 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;

4 (A) and 4 (B) are explanatory diagrams of the operation.

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 an essential part showing a third embodiment of the present invention.

FIG. 7 is a front view of an essential part showing a fourth embodiment of the present invention.

8 is an explanatory view of the operation of FIG.

FIG. 9 is a front view of a conventional example.

FIG. 10 is an explanatory view of the operation of the conventional example.

[Explanation of symbols]

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

Claims (4)

[Claims] 1. A tooth plate rotatably supported by a center shaft of a base plate is provided with a fan-shaped recess having a predetermined radius centered on the center shaft, and teeth are formed on an inner peripheral surface of an arc of the recess. A cam member that engages a tooth member having a tooth portion that engages with and disengages from the tooth portion in the radial direction via a guide portion formed of a pair of guide surfaces, and moves the tooth member. A recliner for a vehicle seat, wherein the cam member is pivotally mounted on a base plate and the cam member is rotatably arranged by an operating lever. The cam member engages with a cam surface of the tooth member.
And a second step formed so as to be able to contact an arm provided on the tooth member, and when a load is applied to the tooth plate during locking, the arm of the tooth member is moved to the second
Of the tooth member together with the first step portion in which the cam member engages with the cam surface of the tooth member by contacting the step portion of the tooth member.
A recliner for vehicle seats, which is held at points. 2. The tooth member is formed with a protrusion on a side facing the arm portion, the protrusion protruding toward the forward tilt rotation direction from the guide surface, and the first surface on the lower surface.
Has a cam surface that engages with the step portion of the
Of the tooth member engages with the cam surface to press the protrusion, the cam member moves the tooth member in the meshing direction of the tooth portion, and the tooth member is rotated rearward to the rotational direction of the tooth member. 2. The vehicle seat recliner according to claim 1, wherein both side end portions of the recliner are brought into contact with the pair of guide surfaces, respectively. 3. The guide portion is composed of a pair of guide surfaces that are formed in parallel to both end surfaces of the tooth member when locked and are inclined in the forward tilt rotation direction, and both end portions of the tooth member are attached to the guide surfaces. Are slidably sandwiched, and when locked, 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 meshing. 2. The vehicle seat recliner according to claim 1, wherein both side ends of the vehicle are brought into contact with the pair of guide surfaces, respectively. 4. A tooth plate rotatably supported by a center shaft of a base plate is provided with a fan-shaped recess having a predetermined radius centered on the center shaft, and teeth are formed on an inner peripheral surface of an arc of the recess. A cam member that engages a tooth member having a tooth portion that engages with and disengages from the tooth portion in the radial direction via a guide portion formed of a pair of guide surfaces, and moves the tooth member. A recliner for a vehicle seat, wherein the cam member is pivotally mounted on a base plate and the cam member is rotatably arranged by an operating lever. The cam member engages with a cam surface of the tooth member.
A step portion, a second step portion formed so as to be able to contact an arm portion provided on the tooth member, and a third step portion formed so as to be able to contact a protrusion portion provided on the tooth member. However, when a backward tilt load is applied to the tooth plate when locked, the arm portion of the tooth member contacts the second step portion, and when a forward tilt load is applied to the tooth plate when locked, the protrusion of the tooth member is A recliner for a vehicle seat, wherein the cam member holds the tooth member at two points together with the first step portion that is brought into contact with the cam surface of the tooth member by contacting the third step portion.