JP3252547B2 - Vehicle seat tilting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for tilting a vehicle seat in a lateral direction.

[0002]

2. Description of the Related Art A seat of a vehicle is tilted in a lateral direction (that is, in a width direction) so that an occupant can easily enter and exit the vehicle.
The posture of the occupant with respect to the lateral G is stabilized.
For example, the device disclosed in Japanese Utility Model Laid-Open No. 2-68220 has a configuration in which the vehicle body and the left and right sides of the seat are connected by a pair of link members, and each link member is connected to a rod that is movable only in the width direction of the seat. In accordance with the movement direction of the rod, the link is moved around the axis in the front-rear direction of the seat such that one of the left and right sides of the seat is directed upward and the other is directed downward, thereby obtaining a tilted state of the seat.

[0003]

In the prior art, a link member arranged on both sides of a seat cushion, a rod moving in the width direction of the seat, and a shaft extending in the front-rear direction of the seat and serving as a tilting center of the seat are provided. Must be accommodated in at least a limited seat space. However, the link member or the like protrudes outward from the side of the seat, which hinders the seating operation of the occupant in addition to poor appearance. Therefore, an object of the present invention is to solve the above-mentioned disadvantages of the related art.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to transmit the rotational motion of the rotating shaft in the width direction of the seat to a sector gear on the frame side via a pair of pinions, In this case, means for meshing one pinion with the sector gear via the idle gear is employed.

Specifically, the present invention relates to a frame on a vehicle floor side, a member on a seat cushion side, a rotating shaft having both ends rotatably supported on both side pieces of the frame and having a pair of pinions, and a frame. A pair of sector gears supported on both side pieces of the vehicle, and seat tilting power transmission means for transmitting the movement of the sector gears to a member on the seat cushion side, wherein one pinion directly meshes with one sector gear and the other pinion Is engaged with the other sector gear via an idle gear.

[0006]

The rotational motion of one rotating shaft is transmitted to the pair of sector gears directly via the pinion on one side and via the idle gear on the other side, so that the rotating directions of both sector gears are opposite, and the left and right sides of the seat are shifted. To get the opposite movement.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat cushion frame 1 is formed of a steel frame, and a sector gear 2 is rotatably supported inside the front portions of left and right side pieces. Further, the central portion of the bell crank 3 is rotatably supported inside the rear portions of the left and right side pieces. The upward arm 4 of the sector gear 2 and the downward piece 5 of the bell crank 3 are connected via a coil spring 6,
Rotational movement about the pin 7 of the sector gear 2 can be transmitted to the bell crank 3 via the coil spring 6.

[0008] Both ends of the hollow bar 8 are fixed to the left and right pieces of the frame 1 so as to extend rearward of the mounting position of the sector gear 2 and in the lateral direction of the seat. A pair of brackets 9 is arranged on the left and right of the bar 8 so as to be rotatable with respect to the bar, and a spring 10 wound around the bar 8 is arranged on the side of the bracket 9, and one end of the spring 10 is connected to the bracket 9. Let it. The other end 11 of the spring 10 extends in the direction of the sector gear 2. Each bracket 9 is connected to the sector gear 2 via a link 12.

A rotation shaft 13 is arranged between the sector gear 2 and the bar 8 in parallel with the bar 8. Both ends of the rotating shaft 13 are rotatably supported by left and right pieces of the frame 1. The rotating shaft 13 is
In cooperation with the electric motor 14 with a reduction gear supported by the bar 8, the motor 14 rotates according to the rotation direction and the rotation amount of the motor 14. A pair of pinions 15 is fixed to the left and right of the rotating shaft 13, one of the pinions 15 is directly meshed with the sector gear 2, and the other pinion 15 is connected to the sector gear 2 via the idle gear 16.
Mesh. As shown in FIG. 4, the sector gear 2 is supported by a back plate 17 behind the sector gear 2 and the frame 1, and the back plate 17 is further supported on the frame 1 by the pins 7 together with the sector gear 2.

A cushion pan 18 is disposed above the frame 1 and the front portions of the left and right sides of the cushion pan 18 are connected to the end 11 of a coil spring 10 wound around a bar 8, and the rear portion is a bell crank. 3 is supported on the tip of the upward piece 19.

To connect the upward piece 19 of the bell crank 3 and the cushion pan 18, a ball bearing 21 is arranged around a pin 20 connecting the two pieces 18, 19, and the ball bearing 21 is pivotally supported by the upward piece 19. Further, a means for tightening the left and right pieces of the cushion pan 18 with the nuts 22 via the washers on the inner pin steps of the ball bearing 21 is used. A spring 24 is interposed between the ball bearing 21 and the pin head 23. As shown in FIG. 5, the cushion pan 18 makes a circular motion around the virtual center point (P), but the link 19 moves vertically up and down. In order to absorb the phase difference between the cushion pan 18 and the upward piece 9 due to the circular motion and the vertical movement, the ball bearing 21 is used.
In contrast, the pin 21 moves against the urging force of the spring 24 and absorbs this phase difference. Since the left and right pieces of the cushion pan 18 are fastened to the stepped portion of the pin 21 by the nut 22, the left and right pieces do not move with respect to the pin 21.

Next, the operation will be described. The electric motor 14 is turned on and the rotating shaft 13 is rotated at the time of getting on or off or when it is necessary to tilt the seat cushion to one side in response to the lateral G. Assuming that the rotation shaft 13 is rotated clockwise in FIG. 1, the right pinion 15 rotates in the same direction, and the right sector gear 2 rotates counterclockwise. Therefore, the bell crank 3 also rotates clockwise, and the upward piece 19 is raised, and the right side of the cushion pan 18 is raised. On the other hand, the rotational movement of the left pinion 15 is transmitted to the left sector gear 2 via the idle gear 16 and rotates the sector gear 2 clockwise. This movement is transmitted to the bell crank 3 on the left side, and rotates the bell crank 3 counterclockwise. That is, the left side of the cushion pan 18 is lowered. Thus, the cushion pan 18 is tilted upward and downward to the left.

When the user wants the seat cushion to be reversed, the rotating shaft 13 is rotated counterclockwise. Rotational movement of both sector gears 15, 15 is controlled by link 12 and bracket 9.
The movement of the sector gears 15 is received by the coil springs 10 via the coil springs 10. Coil spring 10, 10
Of the cushion pan 18 in the upward direction, and absorbs energy in the downward movement. Since the front of the cushion pan 18 is supported by the elastic force of the springs 10 and the rear thereof is supported by the elastic force of the springs 6, 6, the cushion pan 18 is elastically supported by the frame 1.

FIG. 6 shows the posture of the occupant 26 when the seat 25 is tilted left and right.

According to the present invention, since the rotating shaft, the sector gear, and the like can be accommodated in the lower portion of the seat cushion side member, there is no overhang from the seat, and a space can be created around the seat.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a seat tilting device according to an example of the present invention.

FIG. 2 is a side view showing a seat tilting power transmission system on the right side of a frame.

FIG. 3 is a side view showing a seat tilting power transmission system on the left side of a frame.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a diagram showing a configuration in which a bell crank and a cushion pan are combined.

FIG. 6 is a front view showing tilting of the seat.

[Explanation of symbols]

 Reference Signs List 1 frame 2 sector gear 3 bell crank 6, 10 spring 9 bracket 13 rotating shaft 14 motor 15 pinion 16 idle gear 18 cushion pan 20 pin 21 ball bearing 24 spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-256529 (JP, A) JP-A-53-97555 (JP, A) JP-A 61-61240 (JP, U) JP-A 63-97555 7033 (JP, U) Actually open sho 59-94931 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60N 2/10 A47C 7/02

Claims (1)

(57) [Claims] 1. A frame on a vehicle floor side, a member on a seat cushion side, a rotating shaft having both ends rotatably supported on both side pieces of the frame and having a pair of pinions,
It has a pair of sector gears supported on both side pieces of the frame, and seat tilting power transmission means for transmitting the movement of the sector gears to a member on the seat cushion side, wherein one pinion directly meshes with one sector gear and the other pinion A seat tilting device for a vehicle, wherein a pinion meshes with another sector gear via an idle gear.