JP2002291562A - Seat reclining device for vehicle and method of manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce dispersion of an angle in a rotating direction of an operating shaft. SOLUTION: An operating shaft 30 is pressed into a hole 42 for the center of rotations located on a cam-shaped plate 40 and is fixed in the hole. The operating shaft 30 has serrations 32, 34 to transmit a turning force to the outside. The operating shaft 30 is pressed into the hole 42 for the center of rotations located on the cam-shaped plate 40 while the serrations 32, 34 in a rotating direction are located at certain positions corresponding to certain positions of the frame 10 of the device.

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 for rotatably mounting a seat back as a backrest to a seat cushion as a seat surface, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a vehicle seat reclining device of this kind, a machine frame attached to a base plate of a seat cushion and a lid attached to an arm plate of a seat back are rotatably connected to each other.
The mutual rotation between the machine frame and the lid is prevented by the engagement between the teeth of the lock teeth pivotally mounted on the machine frame and the internal gear formed on the inner peripheral surface of the cover, and the machine frame and the cover By rotating the operating shaft provided through the lock tooth, the lock tooth is actuated via the cam-shaped plate to disengage the tooth of the lock tooth and the internal gear, and the mutual rotation between the machine frame and the lid body. One configured to recover is known.

[0003] The operating shaft is integrally connected to the cam-shaped plate by press-fitting or odd-shaped fitting into the rotation center hole of the cam-shaped plate. For example, serrations (joint portions) are formed at the ends of the operation shaft, and, for example, an operation lever is attached via the serrations. The machine frame is provided with a lock spring for rotating the cam-shaped plate in a predetermined direction so that the teeth of the lock teeth always mesh with the internal gear.

That is, in the above vehicle seat reclining device, the cam-shaped plate is automatically rotated by the urging force of the lock spring, and the teeth of the lock teeth are always meshed with the internal gear. The mutual rotation with the body stops, and the seat back is held at a predetermined angle. On the other hand, when the operating lever is operated, the cam-shaped plate rotates against the urging force of the lock spring, and the teeth of the lock tooth separate from the internal gear, so that the machine frame and the lid can rotate with each other. The back becomes rotatable with respect to the seat cushion. After the seat back is set at a predetermined angle, when the operating lever is released, the cam-shaped plate is automatically rotated by the urging force of the lock spring, and the teeth of the lock teeth mesh with the internal gear. And the lid are prevented from rotating with each other, so that the seat back is securely held at the set angle.

[0005]

However, in the above-described vehicle seat reclining device, the teeth of the lock teeth are used as the internal gears by utilizing the amplifying action of the cam surface formed at the contact portion between the cam-shaped plate and the lock teeth. Because of the pressing, the amount of movement of the lock tooth teeth toward the internal gear is extremely small as compared with the amount of movement of the cam surface of the cam-shaped plate in the circumferential direction. For this reason, for example, even when there is only a very small variation in the dimension from the tooth of the lock tooth to the cam surface, the rotation range of the cam-shaped plate and the operating shaft varies. Since this variation is present in all the components, the angle in the rotation direction of the operating shaft stopped by the meshing of the teeth and the internal gear varies greatly from device to device. However, there is a problem that the extending direction of the operation lever connected to the operation shaft via the control lever greatly varies.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and has as its object to provide a seat reclining device for a vehicle that can reduce the variation in the angle of rotation of an operation shaft.

[0007]

In order to solve the above-mentioned problems, the invention according to the first aspect is characterized in that the circular recess (14) formed in the machine frame (10) is fitted into the inner surface side of the circular recess (14). The cover (6) rotatable coaxially along the inner peripheral surface of (14).
0) and a lock tooth (20) and a cam-shaped plate (40) arranged between the machine frame (10) and the lid (60) in the axial direction. ) Has an internal gear (61) along an inner peripheral surface formed coaxially,
The lock tooth (20) is movably attached to the machine frame (10) in a predetermined direction, and a tooth meshable with the internal gear (61) at a position facing the internal gear (61). (21), wherein the cam-shaped plate (40) comprises:
By rotating the cam-shaped plate (40) in one direction around a rotation center hole (42), the lock tooth (2) is rotated.
0) is moved to mesh the teeth (21) with the internal gear (61), or the meshing is released by rotating in the other direction. One side of the body (60) has a seat cushion (15).
0), and the other is connected to the seat back (160), and the teeth (2) of the lock tooth (20) are connected.
1) meshes with the internal gear (61) to hold the seat back (160) at a predetermined angle with respect to the seat cushion (150), and the rotation of the cam-shaped plate (40). In the center hole (42), the operating shaft (30)
The operating shaft (30) has a joint portion for transmitting torque to the outside, and a predetermined position in the joint portion in the rotational direction is set to the machine position. The cam-shaped plate (40) is press-fitted into a rotation center hole (42) in a state where the cam-shaped plate (40) is adjusted to a predetermined position.

According to a second aspect of the present invention, in the first aspect, the teeth (21) of the lock teeth (20) are completely meshed with the internal gear (61) by the rotation of the cam-shaped plate (40), and The operating shaft (30) is aligned with a predetermined position in the rotating direction of the joint portion of the operating shaft (30) and a predetermined position of the machine frame (10), and the operating shaft (30) is rotated through a rotation center hole (42) of the cam plate (40). It is characterized in that it is adapted to be press-fitted.

According to a third aspect of the present invention, in the first or second aspect of the present invention, one of the machine frame (10) and the lid (60) is positioned at each of the left and right sides in the width direction of the seat cushion (150). Each of them is arranged and connected, and the other is connected to each of the left and right positions in the width direction of the seat back (160), and the left and right operation shafts (30) are connected to the shaft (50) via respective joints. It is characterized by being connected.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the joint portion of the operating shaft (30) and the shaft (5) are provided.
0) is characterized in that they are connected in such a manner that play at a predetermined angle occurs in the rotation direction.

According to a fifth aspect of the present invention, there is provided an airframe (10),
A lid (60) rotatably mounted on the machine frame (10) and having an internal gear (61) along an inner peripheral surface formed coaxially; A lock tooth (20) that is freely attached and has a tooth (21) that can mesh with the internal gear (61) at a position facing the internal gear (61), and the lock tooth (20) is moved. A rotary cam-shaped plate (40) capable of engaging or disengaging the teeth (21) with the internal gear (61); and a rotation center hole () of the cam-shaped plate (40). 42) having an operation shaft (30) having a joint portion for transmitting a rotational force to and from the outside, wherein one of the machine frame (10) and the lid (60) is seat cushion (150). Side and seat back (160)
The inclination of the seat back (160) is changed by engaging the teeth (21) of the lock tooth (20) with different positions in the internal gear (61) in a state of being connected to the side. The shaft (30) includes the machine frame (10), the lock tooth (20), and the cam plate (40).
After assembling the lid and the lid (60), the rotation center hole (42) of the cam-shaped plate (40) is aligned with the predetermined position of the joint in the rotation direction at the predetermined position of the machine frame (10). ) Is adopted.

The invention according to claim 6 is the invention according to claim 5, wherein the tooth (2) is formed by the rock tooth (20) swinging.
After rotating the cam-shaped plate (40) until 1) is completely meshed with the internal gear (61), a predetermined position of the joint portion of the operating shaft (30) in the rotational direction and a predetermined position of the machine frame (10). In this state, the operating shaft (30) is press-fitted into the rotation center hole (42) of the cam-shaped plate (40).

[0013] The first aspect of the present invention is configured as described above.
In the described invention, the operating shaft (30) is rotated in the rotation center hole (42) of the cam-shaped plate (40) in a state where the predetermined position in the rotational direction of the joint portion is aligned with the predetermined position in the machine frame (10). Press-fit into the machine frame (1
The angle of the rotation direction of the operation shaft (30) with respect to (0) becomes constant. That is, the rotation of the cam-shaped plate (40) completes the engagement of the teeth (21) of the lock tooth (20) with the internal gear (61), and when the cam-shaped plate (40) is stopped, as described above. By press-fitting the operation shaft (30) into the rotation center hole (42), the position of the operation shaft (30) in the rotation direction at the time of locking, that is, the angle of the operation shaft (30) can be made constant. Therefore, for example, the operation lever is moved to the operation shaft (3).
When the control lever is attached to the joint portion 0), the extending direction of the operation lever can be always constant.

According to the second aspect of the present invention, the teeth (2) of the lock tooth (20) are rotated by the rotation of the cam-shaped plate (40).
1) is completely meshed with the internal gear (61), and the operating shaft (3)
0) at a predetermined position in the rotational direction at the joint portion and the machine frame (1).
The operating shaft (30) is press-fitted into the rotation center hole (42) of the cam-shaped plate (40) in a state where the operating shaft (30) is aligned with the predetermined position of (0). If it is connected to the (150) side, the operation shaft (30) is in a state where the seat back (160) is stopped.
Is always stopped at a fixed angle with respect to the seat cushion (150). That is, when, for example, an operation lever is attached to the operation shaft (30), the operation lever is always stopped at a fixed angle with respect to the seat cushion (150).

In the invention according to claim 3, the machine frame (1
0) and one of the lids (60) are seat cushions (15).
0), and the other is connected to each of the left and right positions in the seat back (160), so that the seat back (1) is connected.
60) can be securely and safely held at a predetermined angle at each of the left and right positions.

The operating shafts (30) located on the left and right have a constant position in the rotational direction of the joint with respect to the machine frame (10).
Can easily be connected to the shaft (50). That is, in the case where the joints are formed in a polygonal cross section such as a serration or a quadrangle, if the positions of the left and right joints in the rotational direction deviate, the joints are correctly fitted to these joints. The joint part on the shaft (50) side formed in the above cannot be fitted to the joint part of each operation shaft (30). For this reason, the play in the rotational direction between the joint portion of the bearing portion and the joint portion of the shaft (50) fitted to the joint portion has conventionally required a large setting for reasons of assembly. However, in the present invention, the positions of the left and right joints in the rotational direction, that is, the angles, do not shift, so that even if the play is reduced, each joint and the shaft (50) can be easily connected. .

Therefore, for example, one operation shaft (3
When only 0) is rotated, it is possible to reduce deviations and variations in the timing of meshing and disengaging the teeth (21) on both left and right sides and the internal gear (61). Therefore, there is an advantage that the feeling when setting the angle of the seat back (160) is improved.

However, each of the joints and the shaft (5)
If the play in the rotation direction with respect to (0) becomes too small, for example, a belt anchor or the like is attached to one side such as the left side of the seat cushion (150). The operation shaft (30) on one side is rotated by elastic deformation of the strength member 150 or the like, and the rotation is performed by the shaft (5).
0) to the operating shaft (30) on the other side, which may cause a problem that the meshing between the tooth (21) on the other side and the internal gear (61) is released. . For this reason, it is preferable to provide the above-described play in the rotation direction in a minimum range. However, in the present invention, in addition to the play in the minimum range, it is not necessary to add the play in assembly which was required conventionally, so that the feeling when setting the angle of the seat back (160) is reduced. It is effective in preventing deterioration.

According to the fourth aspect of the present invention, the joints of the left and right operation shafts (30) and the shaft (50) are connected so that a play at a predetermined angle occurs in the rotational direction. A large force acts on one side such as the left side of the seat cushion (150) from a belt anchor or the like,
Due to the elastic deformation at that time, the operating shaft (30) on one side thereof
Rotates, and the rotation is transmitted to the operation shaft (30) on the other side via the shaft (50), and the teeth (21) on the other side are rotated.
Can be prevented from being disengaged from the internal gear (61). However, since the range of the play can be suppressed to a minimum range for preventing the disengagement of the tooth (21) on the other side with the internal gear (61), the seat back (160) ) Can be prevented from deteriorating the feeling when freely rotating.

According to the fifth aspect of the present invention, there is provided the first aspect.
The same operation and effect as those of the described invention are exerted.

According to the sixth aspect of the present invention, there is provided the second aspect.
The same operation and effect as those of the described invention are exerted.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

The vehicle seat reclining device E shown in this embodiment is fitted on the inner surface side of a circular recess 14 formed in the machine frame 10 and is coaxially rotatable along the inner peripheral surface of the circular recess 14. It has a lid 60, and has a rocking lock tooth 20 and a rotating cam-shaped plate 40 arranged between the machine frame 10 and the lid 60 in the axial direction.

The cover 60 has internal gears 61 formed at two opposing positions along the inner peripheral surface. The lock teeth 20 are swingably mounted at two positions in the machine frame 10 and external gears (teeth) 21 which can mesh with the internal gears 61 at positions opposed to the internal gears 61. have. The cam-shaped plate 40 is rotated in one direction (counterclockwise) around the rotation center hole 42 of the cam-shaped plate 40, so that each of the two lock teeth 20 is rotated.
Is pushed radially outward to mesh the external gear 21 with the internal gear 61, or the mesh is released by rotating in the other direction (clockwise).

The external gear 21 of the lock tooth 20 is connected to the internal gear with one of the machine frame 10 and the lid 60 connected to the seat cushion 150 and the other connected to the seat back 160. By engaging with the seat 61, the seat back 160 is held at a predetermined angle with respect to the seat cushion 150. In this embodiment, the machine casing 10 is arranged and fixed at each position on the left and right sides in the width direction on the seat cushion 150 side, and the lid body 60 is positioned on both the left and right sides in the width direction on the seat back 160 side. And the operation shafts 30 on the left and right sides are serrated (joint portions) 32 described later.
Through a cylindrical shaft 50.

An operation shaft 30 is fixed to the rotation center hole 42 of the cam-shaped plate 40 by press-fitting. The operation shaft 30 has a serration 32 for transmitting a rotational force to the outside, 34, the serrations 32, 3
4 is aligned with the predetermined position of the machine frame 10 in the rotation direction, and the rotation center hole 42 of the cam-shaped plate 40 is
To be press-fitted. Serration 3
2 is formed so as to mesh with a serration (joint portion) 51 formed on the inner surface of the shaft 50, and the serration 34 is formed so as to mesh with a serration 35 formed in a connection hole of the operation lever 31. I have.
The serrations 32 and 34 have uneven positions and shapes in the circumferential direction.

Further, the operation shaft 30 rotates the cam gear 40 to rotate the external gear 21 of the lock tooth 20 to the internal gear 61.
And the serrations 32, 3 of the operating shaft 30
4, the press-fit shaft 30a is aligned with the predetermined position of the machine frame 10 in the rotational direction and the predetermined position of the machine frame 10.
0 is inserted into the rotation center hole 42. Serrations 42a are formed in the rotation center hole 42. The serrations 42a reduce the force required for press-fitting the press-fitting shaft portion 30a of the operation shaft 30, and more firmly fit the press-fitting shaft portion 30a after press-fitting. It is designed to help in holding.

Further, the serrations 32 of the operating shafts 30 and the serrations 51 of the shaft 50 arranged on the left and right sides of the seat are connected with each other so that a play at a predetermined angle occurs in the rotation direction. This play is
For example, a large force acts on one side such as the left side of the seat cushion 150 from a belt anchor or the like, and at that time, the operation shaft 30 on one side rotates due to elastic deformation of the strength member or the like of the seat cushion 150 and the rotation thereof. Is transmitted to the operating shaft 30 on the other side via the shaft 50, and is set to a minimum amount that can prevent the external gear 21 and the internal gear 61 on the other side from being disengaged from each other. Have been.

Hereinafter, the above configuration will be described in more detail.

The outer surface of the machine casing 10 is fixed to the base plate 110 constituting a part of the strength member of the seat cushion 150 by welding, bolts or the like. Are fixed to the arm plate 120 which constitutes a part of the arm by welding or bolts. At a position coaxial with the machine frame 10 and the lid 60, a spiral spring 130 for urging the arm plate 120 in the front (F) direction and tilting the seat back 160 forward is mounted. .

The machine frame 10 is formed in a disk shape as a whole, and has a circular concave portion 14 by forming a circular inner peripheral surface 14a coaxially at a position near the outer periphery. It was done. In addition, the machine frame 10 has a rotation center hole 1 for inserting the operation shaft 30 at its axial center position.
7 are formed.

From the bottom surface of the circular concave portion 14, two first guide convex portions 11A, second guide convex portions 11B, convex portions 13, and two shaft portions 16 are provided. The shaft 16 supports the lock tooth 20 so as to be swingable. The first guide protrusion 11A has a guide surface 11a that slidably guides the first outer peripheral surface 27 of the lock tooth 20 that swings around the shaft portion 16, and the second guide protrusion 11B has the same shaft. The lock tooth 20 has a guide surface 11 b that slidably guides the second outer peripheral surface 28 of the lock tooth 20 that swings around the portion 16. First outer peripheral surface 27, second outer peripheral surface 28, guide surface 11
a and 11b are formed in the shape of a coaxial arc with respect to the rotation center of the lock tooth 20 by the shaft portion 16.

The protruding portion 13 has one first guide protruding portion 11A.
And the other second guide convex portion 11B, and the other first guide convex portion 11B.
The base 70a of the lock spring 70 is disposed between the guide protrusion 11A and one of the second guide protrusions 11B.
Is to be held.

The lock spring 70 is formed in a spiral shape, and urges the cam-shaped plate 40 to rotate counterclockwise in FIG. The lock spring 70 biases the external gear 21 of the lock tooth 20 to always mesh with the internal gear 61 by rotating the cam-shaped plate 40 in a counterclockwise direction.

The lid 60 is also formed in a disk shape like the machine frame 10, and extends along the inner circumferential surface of the rim portion 60a rotatably fitted to the inner circumferential surface 14a of the machine frame 10. The internal gear 61 described above is provided. A rotation center hole 62 for inserting the operation shaft 30 is formed at the axial position of the lid 60.

The lid 60 and the machine frame 10 are covered so that their outer peripheral portions are sandwiched by a ring-shaped holder 80, so that they are rotatably held together without being separated in the axial direction. ing.

The lock tooth 20 has the above-mentioned external gear 21 on one side of the shaft portion 16 and facing the internal gear 61, and a cam-shaped plate on the back side of the external gear 21. The lock cam surface 25 receives a force from the lock cam surface 41 of the lock member 40. That is, the lock tooth 20 receives the force from the lock cam surface 41 at the locked cam surface 25, and swings clockwise about the shaft portion 16 so that the external gear 21 meshes with the internal gear 61. Has become.

The external gear 21 is formed up to a position close to the shaft 16, and the pressure angles of the teeth of the external gear 21 and the internal gear 61 are set to 60 to 90 °. In addition, the external gear 21 is formed so that the height of the teeth on the shaft portion 16 side is lower than the heights of the other teeth, and the radius of the addendum circle of the teeth on the shaft portion 16 side is reduced. Is formed larger than the radius of the addendum circle.

The outer peripheral surface 22 opposite to the external gear 21 across the shaft 16 is cut flat so as not to interfere with the internal gear 61. On the rear side of the outer peripheral surface 22, there is provided the unlocked cam surface 26 which receives a force from the unlocking cam surface 44 of the cam-shaped plate 40. That is, the lock tooth 20 swings counterclockwise by receiving a force from the unlocked cam surface 44 at the unlocked cam surface 26, and the external gear 21 is separated from the internal gear 61. .

The operation shaft 30 is loosely fitted in the respective rotation center holes 17 and 62 of the machine frame 10 and the lid 60, and also freely fits in support holes 112 and 122 formed in the base plate 110 and the arm plate 120, respectively. It is inserted by fitting. The operation shaft 30 has a serration 35
Project outside the base plate 110, and the serrations 32 project outside the arm plate 120. The operation lever 31 attached to the serration 35
Is further provided with an operation knob 33.

The cam-shaped plate 40 is adapted to fix the press-fitting shaft portion 30a of the operation shaft 30 in the rotation center hole 42 by press-fitting, and the above-described lock cam surface 41 and lock release cam surface 44 are provided on the outer peripheral surface. Two each are formed. Further, on the outer peripheral surface of the cam-shaped plate 40, a locking portion 43 for locking the outer end 70b of the lock spring 70 is formed.

The lock spring 70 is composed of a spiral spring, and its base 70a is
And the outer end 70b thereof is locked by the locking portion 43 of the cam-shaped plate 40 to apply a biasing force to the cam-shaped plate 40 to rotate the cam-shaped plate 40 counterclockwise in FIG. It has become. The cam-shaped plate 40 efficiently receives the urging forces from the two lock springs 70 in the tangential direction via the locking portions 43 provided at two axially symmetric positions.

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 rotation center 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 rotation center hole 122. The inner end 132 of the spiral spring 130 is locked in a concave portion (not shown) formed on one side end of the cut-and-raised portion 141.

The outer end 1 of the spiral spring 130
33 is a locking pin 111 provided on the base plate 110.
It is locked to. And this spiral spring 13
By 0, the arm plate 120 is constantly urged to rotate in the front (F) direction.

In FIG. 8, 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, the forward-falling stopper 123 is attached to the locking pin 111 of the base plate 110.
Abuts, thereby restricting rotation of the seat back 160 in the front (F) direction. Further, the present invention is not limited to this embodiment, and the arm plate 120 may be attached to the machine frame 10 and the lid 60 may be attached to the seat cushion 150 side, contrary to the above structure.

Next, the operation, effects and the like of the above-described vehicle seat reclining device E will be described.

To assemble the vehicle seat reclining device E, first, the cam-shaped plate 40 and the lock spring 70 are installed on the machine frame 10 side. In this state, the outer end 70b of the lock spring 70 is engaged with the first guide projection 11A by the urging force of the lock spring 70, and is not engaged with the locking portion 43 of the cam-shaped plate 40.

Next, the cam-shaped plate 40 is rotated clockwise using a shaft-shaped holder (not shown) having serrations meshing with the serrations 42a formed in the rotation center hole 42 of the cam-shaped plate 40. , Thereby the cam-shaped plate 4
0 on the outer end 70b of the lock spring 70
In this state, the lock tooth 20 is installed on the machine frame 10 side, and then the lid 60 is fitted into the circular concave portion 14 of the machine frame 10. That is, when the serration portion of the holder is inserted into the rotation center hole 42 and rotated clockwise, the lock tooth 20 rotates counterclockwise through the unlocking cam surface 44 and the unlocked cam surface 26, and The tooth gear 21 moves radially inward from the position of the internal gear 61 of the virtual lid 60. Therefore, the machine frame 10
The rim portion 60a is inserted between the inner peripheral surface 14a of the lock tooth 20 and the external gear 21 of the lock tooth 20, and the lid 60 is fitted into the circular concave portion 14 of the machine frame 10. Thereafter, the lock spring 7 is released by releasing the force acting on the holder.
By the urging force of 0, the lock tooth 20 swings clockwise through the cam-shaped plate 40, and the external gear 21
1 is engaged. That is, the lock tooth 20
It swings clockwise until the external gear 21 is completely meshed with the internal gear 61. After the lid 60 is assembled, the holder is removed.

Next, the outer peripheral portions of the machine frame 10 and the lid 60 are covered with the holder 80. Thereby, the machine casing 10 and the lid 60
Are supported so as to be rotatable relative to each other without being separated in the axial direction.

In this way, the machine frame 10, the lock tooth 20, the cam-shaped plate 40, the lid 60, the lock spring 7
0, Serration 3 after assembling all holders 80
The press-fit shaft portion 30 of the operating shaft 30 is set in a state where the predetermined positions in the rotation direction in the second and fourth portions are aligned with the predetermined position of the machine frame 10.
a is pressed into the rotation center hole 42 of the cam-shaped plate 40.

The vehicle seat reclining device E, which has been assembled as described above, is assembled at the left and right sides of the seat. In this assembly, the serrations 51 of the shaft 50 are fitted to the serrations 32 of the operation shafts 30.

In the case of the driver's seat, the serration 35 of the operating lever 31 is fitted to the serration 34 of the operating shaft 30 located on the right side (door side) of the seat, and is bolted (not shown) or the like. Move the operation lever 31 to the operation shaft 30
Fixed to. In the case of a passenger seat, an operation lever 31 is attached to an operation shaft 30 located on the left side (door side) of the seat.

In the vehicle seat reclining device E assembled to the seat in this way, as shown in FIG.
Since the lock cam surface 41 is pressed counterclockwise by the urging force of 0, the lock cam surface 41 presses the locked cam surface 25 of the lock tooth 20, and the lock tooth 20 swings clockwise through the shaft portion 16, and the external gear 21. Are in mesh with the internal gear 61 of the lid 60. That is, the rotation of the seat back 160 is stopped.

On the other hand, when the operation shaft 33 is rotated clockwise by operating the operation knob 33 of the operation lever 31, the engagement between the lock cam surface 41 of the cam-shaped plate 40 and the locked cam surface 25 of the lock tooth 20 is released. At the same time, the unlocking cam surface 44 presses the unlocked cam surface 26 of the lock tooth 20.

For this reason, the lock tooth 20 is not
, The outer gear 21 and the inner gear 61 of the lid 60 are disengaged from each other to be in an unlocked state, and the arm plate 12 attached to the lid 60 is unlocked.
0, that is, the seat back 160 has the spiral spring 1
It rotates in the front (F) direction by the urging force of 30.

In order to return from the unlocked state to the locked state again, an operation of releasing the operation knob 33 held at the desired tilting position of the seat back 160 is performed. Then, the cam-shaped plate 40 rotates counterclockwise due to the urging force of the lock spring 70, whereby the lock tooth 2
0 rotates clockwise, and the external gear 21
1 and a lock state is established.

According to the vehicle seat reclining device E, the press-fit shaft portion 30a of the operating shaft 30 is moved in a state where the predetermined positions in the rotation direction of the serrations 32 and 34 are aligned with the predetermined positions of the machine frame 10. Cam-shaped plate 4
Because it is designed to be press-fit into the 0 rotation center hole 42,
The angle in the rotation direction of the operation shaft 30 with respect to the machine frame 10 becomes constant. That is, the rotation of the cam-shaped plate 40 causes the lock tooth 2
When the 0 tooth 21 is completely meshed with the internal gear 61 and the cam-shaped plate 40 is stopped by this, the operating shaft 30 is pressed into the rotation center hole 42 as described above. , That is, the angle of the operation shaft 30 can be made constant. Further, since the machine casing 10 is fixed to the seat cushion 150 side, there is an advantage that the extending direction of the operation lever 31 is always constant with respect to the seat cushion 150, and the appearance is improved.

Further, the machine casing 10 is attached to the seat cushion 150.
Since the lid 60 is connected to each of the left and right positions of the seat back 160, the seat back 160 is securely and securely held at a predetermined angle at each of the left and right positions. Can be.

Further, the operation shaft 30 located on the left and right is
Since the position of the serrations 32 in the rotational direction becomes constant with reference to 0, the shaft 50 can be easily connected to the operation shaft 30 via the respective serrations 32. That is, since the position in the rotation direction of the serrations 32 of the left and right operation shafts 30, that is, the angle does not shift, even if the play in the rotation direction between the serrations 32 of the operation shafts 30 and the serrations 51 of the shaft 50 is reduced. The serrations 32 of the operating shaft 30 and the serrations 51 of the shaft 50 can be easily fitted.

Therefore, for example, in the driver's seat, when the right operating lever 31 is operated, it is possible to reduce the deviation and variation in the timing of the engagement and disengagement of the left and right teeth 21 and the internal gear 61 with each other. it can. Therefore, there is an advantage that the feeling when setting the angle of the seat back 160 is improved.

However, if the play in the rotation direction between the serrations 32 of the operating shaft 30 and the serrations 51 of the shaft 50 becomes too small, a belt anchor or the like is attached to one side such as the left side of the seat cushion 150, for example. When a large force is applied from the belt anchor, the operation shaft 30 on one side is rotated by the elastic deformation of the strength member of the seat cushion 150 or the like, and the rotation is performed via the shaft 50 on the other side. It may be transmitted to the shaft 30 to cause a problem that the mesh between the tooth 21 on the other side and the internal gear 61 is released. For this reason, it is preferable to provide the above-described play in the rotation direction in a minimum range. However, in addition to the play in the minimum range, it is not necessary to add the play in the assembly which was conventionally required, so that the feeling when setting the angle of the seat back 160 is minimized. Can be suppressed.

The lock tooth 20 includes a shaft 16 protruding from the machine frame 10 and two arc-shaped guide surfaces 11a, 11a.
b, the load acting on the seat back 160 due to a collision or the like is not rotatable.
Can be supported by the shaft portion 16 and one of the arc-shaped guide surfaces, and the receiving surface can be enlarged, so that the crushing load due to the load can be increased and the strength can be greatly improved.

In the above embodiment, the lock tooth 2
0, the shaft portion 16, the first guide protrusion 11A, the second guide protrusion 11B, the lock spring 70, and two sets of protrusions are provided. You may comprise so that a set may be provided.

The vehicle seat reclining device E
Are provided on the left and right sides of the seat, but the vehicle seat reclining device E may be provided on one side of the seat.

[0066]

According to the first aspect of the present invention, the operation shaft (30) is connected to the cam-shaped plate (40) while the predetermined position in the rotational direction of the joint portion is aligned with the predetermined position of the machine frame (10). ), The angle of rotation of the operating shaft (30) with respect to the machine frame (10) is constant. That is, the rotation of the cam-shaped plate (40) completes the meshing of the teeth (21) of the lock tooth (20) with the internal gear (61), and thereby the cam-shaped plate (40).
Is stopped, the operation shaft (30) is press-fitted into the rotation center hole (42) as described above, whereby the position of the operation shaft (30) in the rotation direction at the time of stop, that is, the operation shaft (30)
Can be made constant. Therefore, for example, when the operating lever is attached to the joint of the operating shaft (30), the extending direction of the operating lever can be always kept constant.

According to the second aspect of the invention, the teeth (2) of the lock tooth (20) are rotated by the rotation of the cam-shaped plate (40).
1) is completely meshed with the internal gear (61), and the operating shaft (3)
0) at a predetermined position in the rotational direction at the joint portion and the machine frame (1).
The operating shaft (30) is press-fitted into the rotation center hole (42) of the cam-shaped plate (40) in a state where the operating shaft (30) is aligned with the predetermined position of (0). If it is connected to the (150) side, the operation shaft (30) is in a state where the seat back (160) is stopped.
Is always stopped at a fixed angle with respect to the seat cushion (150). That is, when, for example, an operation lever is attached to the operation shaft (30), the operation lever is always stopped at a fixed angle with respect to the seat cushion (150).

According to the third aspect of the present invention, the machine frame (1
0) and one of the lids (60) are seat cushions (15).
0), and the other is connected to each of the left and right positions in the seat back (160), so that the seat back (1) is connected.
60) can be securely and safely held at a predetermined angle at each of the left and right positions.

Further, since the operating shafts (30) located on the left and right have a fixed position in the rotational direction of the joints with respect to the machine frame (10), the operating shafts (30) are connected via the respective joints.
Can easily be connected to the shaft (50). That is, in the case where the joints are formed in a polygonal cross section such as a serration or a quadrangle, if the positions of the left and right joints in the rotational direction deviate, the joints are correctly fitted to these joints. The joint part on the shaft (50) side formed in the above cannot be fitted to the joint part of each operation shaft (30). For this reason, the play in the rotational direction between the joint portion of the bearing portion and the joint portion of the shaft (50) fitted to the joint portion has conventionally required a large setting for reasons of assembly. However, in the present invention, the positions of the left and right joints in the rotational direction, that is, the angles, do not shift, so that even if the play is reduced, each joint and the shaft (50) can be easily connected. .

Therefore, for example, one operation shaft (3
It is possible to reduce deviations and variations in the timing of meshing and disengaging the teeth (21) on both left and right sides and the internal gear (61) when rotating (0). Therefore, there is an advantage that the feeling when setting the angle of the seat back (160) is improved.

However, each of the joints and the shaft (5
If the play in the rotation direction with respect to (0) becomes too small, for example, a belt anchor or the like is attached to one side such as the left side of the seat cushion (150). The operation shaft (30) on one side is rotated by elastic deformation of the strength member 150 or the like, and the rotation is performed by the shaft (5).
0) to the operating shaft (30) on the other side, which may cause a problem that the meshing between the tooth (21) on the other side and the internal gear (61) is released. . For this reason, it is preferable to provide the above-described play in the rotation direction in a minimum range. However, in the present invention, in addition to the play in the minimum range, it is not necessary to add the play in assembly which was required conventionally, so that the feeling when setting the angle of the seat back (160) is reduced. It is effective in preventing deterioration.

According to the fourth aspect of the present invention, the joints of the left and right operation shafts (30) and the shaft (50) are connected so that a play at a predetermined angle is generated in the rotational direction. A large force acts on one side such as the left side of the seat cushion (150) from a belt anchor or the like,
Due to the elastic deformation at that time, the operating shaft (30) on one side thereof
Rotates, and the rotation is transmitted to the operation shaft (30) on the other side via the shaft (50), and the teeth (21) on the other side are rotated.
Can be prevented from being disengaged from the internal gear (61). However, since the range of the play can be suppressed to a minimum range for preventing the disengagement of the tooth (21) on the other side with the internal gear (61), the seat back (160) ) Can be prevented from deteriorating the feeling when freely rotating.

In the fifth aspect of the present invention, the first aspect
The same operation and effect as those of the described invention are exerted.

In the invention according to claim 6, claim 2
The same operation and effect as those of the described invention are exerted.

[Brief description of the drawings]

FIG. 1 is an explanatory front view of a main part of a vehicle seat reclining device according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of the vehicle seat reclining device.

FIG. 3 is an enlarged front view explanatory view showing a lock tooth of the vehicle seat reclining device.

FIG. 4 is a diagram showing the vehicle seat reclining device, and is an enlarged view of a portion surrounded by a dashed line in FIG. 3;

FIG. 5 is an exploded perspective view of an essential part of the vehicle seat reclining device.

FIG. 6 is an explanatory front view of the vehicle seat reclining device.

FIG. 7 is a view showing the vehicle seat reclining device, and is an explanatory view taken along the line VII-VII of FIG. 6;

FIG. 8 is a view showing the vehicle seat reclining device, and is an explanatory view taken in the direction of arrows VIII-VIII in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Machine frame 14 Circular recess 20 Lock tooth 21 External gear (teeth) 30 Operation shaft 32, 34 Serration (joint part) 40 Cam-shaped plate 42 Rotation center hole 50 Shaft 60 Cover body 60 61 Internal gear 150 Seat cushion 160 Seat back E Vehicle seat reclining device

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 3B099 AA05 BA05 CA18

Claims (6)

[Claims] 1. A circular recess (1) formed in a machine frame (10).
4) has a lid (60) that fits on the inner surface side and can rotate coaxially along the inner peripheral surface of the circular concave portion (14), and includes the machine frame (10) and the lid ( The lock tooth (20) and the cam plate (4) arranged between the axial directions of (60).
0), the lid (60) has an internal gear (61) along an inner peripheral surface formed coaxially, and the lock tooth (20) is provided with the machine frame (10). The cam-shaped plate (40) has a tooth (21) that is movably attached to the internal gear (61) and that can mesh with the internal gear (61) at a position facing the internal gear (61). ) Rotates the lock tooth (20) by rotating in one direction around the rotation center hole (42) of the cam-shaped plate (40) to move the tooth (21).
Is meshed with the internal gear (61), or the meshing is released by rotating in the other direction. One of the machine frame (10) and the lid (60) is a sheet. With the teeth (21) of the lock teeth (20) meshing with the internal gear (61) in a state of being connected to the cushion (150) side and the other being connected to the seat back (160) side, the seat back ( 160) is held at a predetermined angle with respect to the seat cushion (150), and the operating shaft (30) is fixed by press-fitting into the rotation center hole (42) of the cam-shaped plate (40). The operating shaft (30) has a joint portion for transmitting a rotational force to the outside, and a predetermined position of the joint portion in the rotational direction is set to the position of the machine frame (10). State adjusted to the specified position The cam-shaped plate (40) for a vehicle seat reclining apparatus characterized by being adapted to be pressed into the rotation center hole (42) of. 2. The rotation of the cam-shaped plate (40) completes the engagement of the teeth (21) of the lock tooth (20) with the internal gear (61), and a predetermined rotation direction at the joint of the operating shaft (30). The operation shaft (30) is press-fitted into the rotation center hole (42) of the cam-shaped plate (40) in a state where the position is aligned with a predetermined position of the machine frame (10). Item 4. A vehicle seat reclining device according to Item 1. 3. One of the machine frame (10) and the lid (60) is arranged and connected to each of the left and right positions in the width direction of the seat cushion (150), and the other is connected to the seat back (160). 3. The vehicle according to claim 1, wherein the left and right operation shafts are connected to respective positions on both left and right sides in the width direction, and the left and right operation shafts are connected by shafts via respective joints. Seat reclining device. 4. A joint part of an operating shaft (30) and a shaft (5).
4. The vehicle seat reclining device according to claim 3, wherein the vehicle seat reclining device is connected so that play at a predetermined angle occurs in the rotation direction. 5. A machine frame (10), and a lid (60) rotatably mounted on the machine frame (10) and having an internal gear (61) along an inner peripheral surface formed coaxially. The internal gear (61) is movably attached to the machine frame (10) in a predetermined direction, and is located at a position facing the internal gear (61).
Lock tooth (20) having teeth (21) meshable with it
Then, the lock tooth (20) is moved, and the tooth (2) is moved.
1) A rotary cam-shaped plate (40) capable of meshing with or releasing the internal gear (61).
And an operating shaft (30) press-fitted into a rotation center hole (42) of the cam-shaped plate (40) and having a joint portion for transmitting a rotational force to the outside, and the machine frame (10). And one end of the lid (60) is connected to the seat cushion (150) side and the other is connected to the seat back (160), and the teeth (21) of the lock tooth (20) are connected to the internal gear (61). The inclination of the seat back (160) is changed by meshing with the different positions in (1) and (2). The operating shaft (30) includes the machine frame (10), the lock tooth (20), and the cam-shaped plate (40). After assembling the lid and the lid (60), the rotation center hole (42) of the cam-shaped plate (40) is aligned with the predetermined position of the joint in the rotation direction at the predetermined position of the machine frame (10). ) Of manufacturing seat reclining equipment for automobiles. 6. The cam-shaped plate (40) is rotated until the teeth (21) are completely engaged with the internal gear (61) by the swing of the lock tooth (20), and then the rotation of the operating shaft (30) at the joint portion. The operation shaft (30) is aligned with the predetermined position in the direction and the predetermined position of the machine frame (10).
6. The method of manufacturing a vehicle seat reclining device according to claim 5, wherein the press-fitting is performed into the rotation center hole (42).