JP2002065388A - Device of reclining seatback for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause no phase difference when a pair of upper arms consisting of a right upper arm and the left one rotate. SOLUTION: Distance difference is set for the first cam 61 mounted on a drive shaft 6 and the second cam 82 mounted on a driven shaft 8 so that a difference between a distance produced until the first cam 61 comes into contact with the first wedge 7 and a distance produced until the second cam 82 comes into contact with the second wedge 9 can be equivalent to the difference between a rotary angle of the drive shaft 6 and that of the driven shaft 8.

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 having a pair of left and right reclining mechanisms which are operated by transmitting rotation of a drive shaft to a driven shaft.

[0002]

2. Description of the Related Art Conventionally, as a vehicle seat reclining device of this type, one disclosed in Japanese Patent Application Laid-Open No. 56-157635 is known. This is a pair of left and right upper arms that are fixed to the seat back and have internal teeth formed thereon, and a pair of left and right upper arms that are fixed to the seat cushion and mesh with the internal teeth and have fewer external teeth than the internal teeth. A first arm and a second arm, each of which is disposed between the lower arm and the upper arm to maintain a meshing position between the internal tooth portion and the external tooth portion;
A drive shaft rotatably supported on one of the lower arms, a driven shaft rotatably supported on the other of the lower arms, and a wedge member provided on the drive shaft and the driven shaft. Vehicle seat reclining having first and second cam members capable of changing a meshing position between the driving shaft and an external tooth portion, and an interlocking shaft that links a driving shaft and a driven shaft and transmits rotation of the driving shaft to the driven shaft. Device.

In this device, the meshing position of the internal teeth and the external teeth is normally held by the first and second wedge members to restrict the rotation of the pair of left and right upper arms with respect to the pair of left and right lower arms. ing. When the drive shaft is rotated in this state, the first cam member rotates, and the rotation of the drive shaft is transmitted to the driven shaft, whereby the driven shaft rotates and the second cam member rotates. The rotation of the first and second cam members pushes the first and second wedge members. This makes it possible to change the meshing position between the internal teeth and the external teeth, and to rotate the pair of left and right upper arms with respect to the pair of left and right lower arms.

[0004]

Normally, the interlocking of the driving shaft and the driven shaft via the interlocking shaft involves disposing the interlocking shaft between the driving shaft and the driven shaft coaxially with the driving shaft and the driven shaft. The serration shafts formed on the drive shaft and the driven shaft are fitted into serration holes formed at both ends of the interlocking shaft, respectively, to connect the driving shaft, the driven shaft and the interlocking shaft. Thus, the drive shaft and the driven shaft are coaxially linked by the interlocking shaft such that the rotation of the drive shaft is transmitted to the driven shaft.

However, the connection between the drive shaft, the driven shaft, and the interlocking shaft requires a clearance in the rotational direction between the serration shaft and the interlocking shaft in order to fit the serration shaft into the serration hole (improve the assemblability). You have set. For this reason, the rotation of the drive shaft is transmitted to the driven shaft with a delay by the clearance between the drive shaft and the interlocked shaft and the clearance between the interlocked shaft and the driven shaft. Between them, a rotation difference of a predetermined angle is generated. Since this rotation difference causes a delay in pushing between the first wedge member and the second wedge member, as a result, a phase difference occurs in the rotation between one upper arm and the other upper arm, The user will feel uncomfortable.

Therefore, an object of the present invention is to prevent a phase difference from occurring in the rotation of the pair of left and right upper arms.

[0007]

The technical measures taken in the present invention to solve the above technical problems are a first cam member provided on a drive shaft and a second cam member provided on a driven shaft. A difference in the amount of movement between the drive shaft and the driven shaft before contact with the first wedge member and the second wedge member, which is substantially the same as the difference between the rotation angles of the drive shaft and the driven shaft, is set.

According to this technical means, until the rotation angle difference between the drive shaft and the driven shaft comes into contact with the first wedge member and the second wedge member of the first cam member and the second cam member. And the first and second wedge members start pushing at substantially the same timing. Thus, one upper arm and the other upper arm can rotate at substantially the same timing.

More preferably, a contact formed on the first cam member and capable of abutting against an end face of the first wedge member and facing the end face with a predetermined first gap. A first notch forming a contact surface; and a first notch formed in the second cam member and capable of contacting an end surface of the second wedge member, and between the first notch portion and the end surface. And a second notch which forms an abutting contact surface with a small predetermined second gap.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pair of right and left reclining mechanisms 1 are respectively provided with a lower arm 3 attached to a side of a seat cushion 2 via a lower bracket 21, and a side of a seat back 4. And an upper arm 5 attached to the main body.

As shown in FIGS. 2 to 4, each of the pair of left and right lower arms 3 is subjected to a half-blanking press process so that the central portion thereof is depressed with respect to a general plane portion to be attached to the lower bracket 21. Thus, an annular internal tooth portion 31 and a space 32 are formed. Each of the pair of left and right upper arms 5 is subjected to a half-blanking press process so that a central portion thereof projects from a general flat portion attached to the seat back 4, so that the external tooth portion 51 is formed.
Are formed by half-pressing. The outer teeth portion 51 of the upper arm 5 has one or more teeth less than the inner teeth portion 31 of the lower arm 3 and is located in the space 32 and partially overlaps with the inner teeth portion 31 of the lower arm 3 (FIGS. 3 and 4). (Upper part shown).

Each of the pair of lower arms 3 has a burring portion 33 projecting into a space 32 around the lower arm 3.
Is formed. On the other hand, the pair of left and right upper arms 5 have external tooth portions 5 around them, respectively.
A through-hole 53 having a burring portion 52 protruding in a direction opposite to the direction 1 is formed.

The drive shaft 6 has a shaft hole 34 and a through hole 5 in one of the lower arms 3 shown in FIGS.
3 is rotatably supported by a burring portion 33 via a bush 35. Between the burring portion 33 of one lower arm 3 and the burring portion 52 of one upper arm 5, a pair of wedge members 7 located in the space 32 are arranged at predetermined intervals in the circumferential direction of the drive shaft 6. It is arranged in. The pair of wedge members 7 are arranged so as to cover substantially the upper half of the outer peripheral surface of the burring portion 33 as viewed in FIG. Each of the pair of wedge members 7 has a wedge shape in which the thickness increases as the portions are closer to each other.
In addition, it has an arc shape whose inner surface can contact the outer peripheral surface of the burring portion 33 and whose outer surface can contact the inner peripheral surface of the ring 54 press-fitted and fixed to the inner peripheral surface of the burring portion 52. Further, the pair of wedge members 7 are attached so as to widen the interval between them by a spring 71 whose one end 71a is locked to one wedge member 7 and the other end 72b is locked to the other wedge member 7. It is being rushed. Accordingly, the pair of wedge members 7 exerts the wedge effect on the burring portions 33 and 52 by receiving the urging force of the spring 71, and the center of the ring 54 is largely eccentric with the center of the drive shaft 6. ,
A part of the external tooth portion 51 of the one upper arm 5 that meshes with the internal tooth portion 31 of the one lower arm 3 is strongly pressed against the internal tooth portion 31 of the one lower arm 3 to mesh the internal tooth portion 31 with the external tooth portion 51. The play is suppressed.

As shown in FIG. 3, a flange 61 is integrally formed at a substantially central portion in the longitudinal direction of the drive shaft 6. The flange 61 is formed with a cutout 62 that cuts out a part of the peripheral surface to form a pair of contact surfaces 62a and 62b. Each of the pair of wedge members 7 is formed with a protrusion 72 that protrudes in the axial direction. The projections 72 of the pair of wedge members 7 are located in the cutouts 62 side by side in the circumferential direction of the drive shaft 6. The protrusion 72 of the one wedge member 7 is provided on the contact surface 6 of the notch 62.
2a, and the projection 72 of the other wedge member 7 has an end surface 72b facing the contact surface 62b of the notch 62. End surface 72 of projection 72
a, 72b and the contact surfaces 62a, 62b of the notch portion 62 have a predetermined gap C that allows the drive shaft 6 to rotate at a predetermined angle until the contact surfaces 62a, 62b contact the end surfaces 72a, 72b. ing.

In the other lower arm 3 shown in FIGS. 2 and 4, a driven shaft 8 is provided with a shaft hole 34 and a through hole 5.
3 is rotatably supported by a burring portion 33 via a bush 35. Between the burring portion 33 of the other lower arm 3 and the burring portion 52 of the other upper arm 5, a pair of wedge members 9 located in the space 32 are arranged side by side at a predetermined interval in the circumferential direction of the driven shaft 8. Has been established. This set of wedge members 9 is disposed so as to cover substantially the upper half of the outer peripheral surface of the burring portion 33 as viewed in FIG. Each of the pair of wedge members 9 has a wedge shape in which the thickness increases as the portions are closer to each other.
In addition, it has an arc shape whose inner surface can contact the outer peripheral surface of the burring portion 33 and whose outer surface can contact the inner peripheral surface of the ring 54 press-fitted and fixed to the inner peripheral surface of the burring portion 52. Also, this pair of wedge members 9 is attached so that the distance between them is increased by a spring 91 whose one end 91a is locked to one wedge member 9 and the other end 92b is locked to the other wedge member 9. It is being rushed. Accordingly, the pair of wedge members 9 exerts a wedge effect on the burring portions 33 and 52 by receiving the urging force of the spring 91, and the center of the ring 54 is largely eccentric with the center of the driven shaft 8. ,
A part of the external teeth 51 of the other upper arm 5 that meshes with the internal teeth 31 of the other lower arm 3 is strongly pressed against the internal teeth 31 of the other lower arm 3 so that the internal teeth 31 and the external teeth 51 The mesh play is suppressed.

As shown in FIG. 4, a flange portion 81 is integrally formed at a substantially central portion in the longitudinal direction of the driven shaft 8. The flange portion 81 is formed with a cutout 82 that cuts out a part of the peripheral surface to form a pair of contact surfaces 82a and 82b. Each of the pair of wedge members 9 is formed with a protrusion 92 that protrudes in the axial direction. The projections 92 of the pair of wedge members 9 are located in the cutouts 82 side by side in the circumferential direction of the driven shaft 8. The protrusion 92 of the one wedge member 9 is provided on the contact surface 8 of the notch 82.
2a, and the protrusion 92 of the other wedge member 9 has an end surface 92b facing the contact surface 82b of the notch 82. End surface 92 of projection 92
a, 92b and the contact surfaces 82a, 82b of the notch 82 have a predetermined clearance D that allows the driven shaft 9 to rotate at a predetermined angle until the contact surfaces 82a, 82b contact the end surfaces 92a, 92b. ing.

As shown in FIGS. 1 and 2, one end and the other end of the drive shaft 6 are provided with serration shaft portions 63 and 6.
4 are formed. Also, at one end of the driven shaft 8,
A serration shaft 83 is formed.

The drive mechanism 10 is supported via a bracket 22 on a lower bracket 21 to which one lower arm 3 is attached. The drive mechanism 10 includes the electric motor 1
0a and a reduction gear structure 10b, and the output gear 10c has a serration hole 10d.
The serration shaft 63 of the drive shaft 6 is fitted into the serration hole 10d of the output gear 10c. Thus, the output gear 10c of the drive mechanism 10 and the drive shaft 6 are connected so as to rotate integrally, and the electric motor 10
The drive shaft 6 is rotated by the driving of a.

The drive shaft 6 and the driven shaft 8 are coaxially arranged, and an interlocking shaft 11 is coaxially arranged between them. The interlocking shaft 11 has a serration hole 11a and has a pipe shape with both ends 11b and 11c opened. The serration shaft portion 64 of the drive shaft 6 is inserted from one end 11b of the interlocking shaft 11 into the serration hole portion 11c.
Of the interlocking shaft 11
1c is inserted into the serration hole 11c. As a result, the drive shaft 6, the driven shaft 8 and the interlocking shaft 11 are connected so as to rotate integrally, and the drive shaft 6 and the driven shaft 8 are linked via the interlocking shaft 11. Then, the rotation of the driving shaft 6 is transmitted to the driven shaft 8 via the interlocking shaft 11, and the rotation of the driving shaft 6 rotates the interlocking shaft 11, and the rotation of the interlocking shaft 11 rotates the driven shaft 8. .

As shown in FIGS. 5 and 6, serration shafts 64, 8 of the drive shaft 6 and the driven shaft 8 are provided.
3 and the serration hole 11a of the interlocking shaft 11
Predetermined clearances E1 and E2 are set in the rotation direction to improve the assemblability.

As shown in FIGS. 3 and 4, the circumferential length A (distance between the contact surfaces 62a and 62b) of the cutout portion 62 of the flange portion 61 of the drive shaft 6 is different from the flange length of the driven shaft 8. It is longer than the circumferential length (distance between the contact surfaces 82a and 82b) B of the notch 82 of the portion 81.
Thus, the gap C between the contact surfaces 62a, 62b of the notch 62 and the end surfaces 72a, 72b of the wedge member 7 is equal to the contact surfaces 82a, 82b of the notch 82 and the end surface 9 of the wedge member 9.
The gap D is larger than the gap D between 2a and 92b.
The difference between the gap C and the gap D is determined by the serration shafts 64 and 83 of the drive shaft 6 and the driven shaft 8 and the interlocking shaft 11.
E1 and E between the serration holes 11a
It is almost equivalent to 2 minutes.

Next, the operation of the pair of left and right reclining mechanisms 1 will be described.

As shown in FIGS. 3 and 4, the wedge members 7, 9 normally press the outer teeth 51 of the upper arm 5 against the inner teeth 31 of the lower arm 31 under the urging force of the springs 71, 91. Have been.

When the drive mechanism 10 is driven to rotate the drive shaft 6 clockwise as shown in FIG.
2a, the pair of wedge members 7 is pushed against the urging force of the spring 71 so as to reduce the distance between the pair.
Thus, the amount of eccentricity of the ring 54 with respect to the drive shaft 6 is reduced, and the outer teeth 51 of the upper arm 5 are reduced.
Of the lower arm 3 against the internal teeth 31 is eliminated. At this time, the rotation of the drive shaft 6 is transmitted to the interlocking shaft 11 with a delay of the clearance E1 between the serration shaft 64 and the serration hole 11a,
The interlocking shaft 11 rotates clockwise as shown in FIG. 5 at a rotation angle delayed by the clearance E1 with respect to the drive shaft 6. Further, the rotation of the interlocking shaft 11 is transmitted to the driven shaft 8 with a delay of the clearance E2 between the serration shaft 83 and the serration hole 11a, and the driven shaft 8 is separated from the interlocking shaft 11 by the clearance E2. It rotates clockwise as shown in FIG. 6 at a delayed rotation angle. That is, the driven shaft 11 rotates clockwise as shown in FIG. 4 at a rotation angle delayed by the clearances E1 and E2 with respect to the drive shaft 11. However, since the clearance D between the contact surface 82a and the end surface 92a is smaller than the clearance C between the contact surface 62a and the end surface 72a by the clearances E1 and E2, the contact surface 82a and the end surface 92a are in contact with each other. The pair of wedge members 9 are pressed at substantially the same timing as the above-mentioned pair of wedge members 7 by abutting at substantially the same timing as the abutment between the 62a and the end surface 72a. Thus, the amount of eccentricity of the ring 54 with respect to the driven shaft 8 is reduced, and the pressing of the external teeth 51 of the other upper arm 5 against the internal teeth 31 of the other lower arm 3 is eliminated.

When the drive shaft 6 and the driven shaft 8 are further rotated, the set of wedge members 7 and the set of wedge members 9 come into contact with each other and rotate in the same direction as the drive shaft 6 and the driven shaft 8. The rotation of the wedge members 7 and 9 causes the internal teeth 31 of the lower arm 3 and the external teeth 51 of the upper arm 5 to rotate.
When the drive shaft 6 and the driven shaft 9 make one rotation, the upper arm 5 rotates with respect to the lower arm 3 by an angle corresponding to the difference in the number of teeth between the external teeth 51 and the internal teeth 31. Move. Thereby, the angle of the seat back 4 with respect to the seat cushion 2 is adjusted.

In this embodiment, the drive shaft 6
In addition, the flange portions 61 and 81 are formed integrally with the driven shaft 8, but the flange portions 61 and 81 are formed as separate members and attached to the drive shaft 6 and the driven shaft 8 so as to rotate integrally by serration coupling or the like. May be. or,
Although the gaps C and D are set by the circumferential lengths of the notches 62 and 82, they may be set by the circumferential lengths of the wedge members 7 and 9.

[0027]

According to the present invention, the first cam member provided on the drive shaft and the second cam member provided on the driven shaft have substantially the same rotational angle difference as the drive shaft and the driven shaft. By setting the same amount of movement difference until the first wedge member and the second wedge member come into contact with each other, the rotation angle difference between the drive shaft and the driven shaft is set between the first cam member and the second cam member. Since the difference in the amount of movement until the first wedge member and the second wedge member are brought into contact with each other, the first and second wedge members are pushed regardless of the rotation angle difference between the drive shaft and the driven shaft. Can be started at substantially the same timing. Thereby, the one upper arm and the other upper arm can be rotated at substantially the same timing, and the discomfort felt by the user can be eliminated.

[Brief description of the drawings]

FIG. 1 is a front view of a vehicle seat equipped with a vehicle seat reclining device according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a view in the direction of arrow E in FIG. 2;

FIG. 4 is a view in the direction of arrow F in FIG. 2;

FIG. 5 is a front view showing a connection structure between a drive shaft and an interlocking shaft according to the present invention.

FIG. 6 is a front view showing a connection structure between a driven shaft and an interlocking shaft according to the present invention.

[Explanation of symbols]

 Reference Signs List 2 seat cushion 3 lower arm 4 seat back 5 upper arm 6 drive shaft 7 first wedge member 8 driven shaft 9 second wedge member C first ski D second ski 11 interlocking shaft 31 internal teeth 51 external teeth 61 Flange (first cam member) 62 First notch 81 Flange (second cam member) 82 Second notch

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B087 BD03 3B099 AA05 BA04 CA05 CA20 CA31 CB01 CB06 DA10

Claims (2)

[Claims] 1. A pair of left and right lower arms fixed to a seat cushion and formed with one of an internal tooth portion and an external tooth portion meshing with the internal tooth portion and having a smaller number of teeth than the internal tooth portion, and a seat back. A pair of left and right upper arms, each of which is fixed to the other and the other of the internal teeth and the external teeth are provided, and the internal teeth and the external teeth are respectively disposed between the lower arm and the upper arm. First and second wedge members that hold an engagement position, a drive shaft rotatably supported on one of the lower arms, a driven shaft rotatably supported on the other of the lower arms, the drive shaft and the drive shaft. First and second cam members provided on a driven shaft, the first and second cam members being capable of contacting the wedge member and pushing the wedge member to change a meshing position between the internal tooth portion and the external tooth portion; and the drive shaft. When In a vehicle seat reclining device having an interlocking shaft that links the driven shaft and transmits rotation of the drive shaft to the driven shaft, the first cam member provided on the drive shaft and the driven shaft are provided on the driven shaft. A difference in the amount of movement of the second wedge member between the drive shaft and the driven shaft until the first wedge member and the second wedge member come into contact with each other is set to be substantially equal to the rotation angle difference between the drive shaft and the driven shaft. A vehicle seat reclining device, characterized in that: 2. The first cam member formed on the first cam member.
A first cut-out portion which can be in contact with an end surface of the wedge member and forms a contact surface facing the end surface with a predetermined first gap, and the second cam member And a second wedge member is formed to be in contact with an end surface of the second wedge member and to form an abutting surface between the end surface and the second wedge member with a predetermined second gap smaller than the first gap. The vehicle seat reclining device according to claim 1, further comprising two notches.