JPH07315086A - Seat sliding device - Google Patents

Abstract

PURPOSE:To enable the manual adjustment of seat position even in the case of defectiveness being generated on a motor or its wiring and moreover enable the fine adjustment of the seat position. CONSTITUTION:The front and rear end parts of a screw 26 are supported only rotatably on a supporting casing 16 and a supporting means 17 fixed to the front and rear parts of either one of a lower rail 10 and an upper rail 11. A nut 25 supported only rotatably to a bracket 15 fixed to the other one of both rails and rotatory-driven by a motor is screw-engaged with the screw 26. The screw 26 is rotated by driving gear 30 through a driven gear 31 and a pair of idle gears 32a, 32b. The manual shaft 33 of the driving gear 30 provided with a handle 35 is movable along a circular arc around the axis of each idle gear by a V-shape oblong hole 37 formed at a cover 18 and the supporting casing 16 and elastically energized toward the joint part of the V-shape oblong hole 37 by a spring 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat slide device for moving a seat of an automobile or the like by a motor.

[0002]

2. Description of the Related Art A seat slide device of this type is, for example, as shown in FIG. This is because a pair of left and right lower rails 1 fixed to a vehicle body of an automobile or the like supports an adjuster 2 which supports both side portions of a seat cushion 7 and a seat back 8 slidably in the front-rear direction, and is provided in parallel with the sliding direction. A rear end of the screw 3 is supported by a bracket 3a fixed to the adjuster 2, and a front end of the screw 3 is supported and rotated by a motor 4 attached to a motor bracket 2a connecting the left and right adjusters 2. . A nut 6 fixed to the lower rail 1 is screwed to the screw 3 via a bracket 1a,
If the user operates the double throw type seat switch 9 mounted on the side surface of the adjuster 2 to rotate the motor 4 in the forward or reverse direction, the seat cushion 7 and the seat back 8 move forward or backward together with the adjuster 2. Then, when the seat switch 9 is released, it stops at the desired position.

[0003]

However, the above-mentioned conventional technique has a problem that the seat position cannot be adjusted when a problem occurs in the motor or the wiring thereof. There is also a problem that it is difficult to make a very slight fine adjustment of the seat position. The present invention aims to solve each of these problems.

[0004]

To this end, the seat slide device according to the present invention, as illustrated in FIGS. 1 to 3, has a lower rail 10 fixed to a vehicle body and slidable in the longitudinal direction on the lower rail. In a seat slide device including an upper rail 11 that is guided and supported and to which a seat is attached, a support casing 16 and a support member 17 fixed to a front portion and a rear portion of any one of the rails 10 and 11 are provided with the longitudinal direction. The front and rear ends of the screw 26 arranged in parallel are rotatably supported. A nut 25, which is rotatably supported by a bracket 15 fixed to the other of the rails 10 and 11 and is rotationally driven by a motor 28, is screw-engaged with the screw 26. A driven gear 31 is attached to the front end portion of the screw 26, and a pair of idle gears 32a, 32b rotatably supported by the support casing 16 and its cover 18 at a distance from each other.
Are meshed with the driven gear 31. The support casing 16 is formed with a V-shaped elongated hole 36 having a V-shaped connecting portion on the side of the driven gear 31 and having a V-shape with the bisector of the rotational axes of the idle gears 32a and 32b as the axis of symmetry. The V-shaped elongated hole 36 is composed of two arc-shaped portions 36a and 36b whose center lines are arcs of the same radius centered on the rotational axes of the idle gears 32a and 32b. V formed at a position corresponding to the V-shaped long hole 36 of the cover 18.
The elongated slot 37 is composed of two arc-shaped portions having the same two arcs as the V-shaped elongated hole 36 as a center line. A manual shaft 33 integrally formed with the drive gear 30 is supported by both V-shaped elongated holes 36 and 37 so as to be movable in the respective arc directions, and the manual shaft 33 is positioned at a V-shaped joint portion. In this state, the drive gear 30 is in mesh with the driven gear 31 and the idle gears 32a and 32b at the same time.
Elastically biased towards the shaped joint. The manual shaft 3
A handle 35 is fixed to 3.

[0005]

In a normal state where no external force is applied to the handle 35, the manual shaft 33 is urged by the spring 38 to form the V-shaped long hole 3
6 and 37, which are located at the V-shaped joint, are incapable of rotating because the drive gear 30 is in mesh with the driven gear 31 and both idle gears 32a and 32b at the same time, and therefore the screw 26 is also incapable of rotating. When the motor 28 is operated in this state to rotate the nut 25 in the forward or reverse direction, the lower rail 10 and the upper rail 11 are relatively moved, and the position of the seat attached to the upper rail 11 is adjusted.

When the motor 28 is not operating, the nut 25 cannot rotate. If the handle 35 is rotated in this state, the manual shaft 33 will move in the V-shaped long hole 3 depending on the direction.
It moves against the spring 38 along either one of the arcuate portions 6 and 37. When the manual shaft 33 reaches the free end of its arcuate portion, the drive gear 30 remains engaged with either one of the idle gears, but disengages from the driven gear 31 and the other idle gear. To be done.
After that, the rotation of the handle 35 is transmitted from the drive gear 30 to the driven gear 31 via one idle gear, and the screw 26 is rotated. As a result, the lower rail 10 and the upper rail 11 are relatively moved, and the position of the seat attached to the upper rail 11 is adjusted.

[0007]

EXAMPLES The present invention will be described below with reference to the examples shown in FIGS. As shown in Fig. 1, front and rear mounting brackets 1
An upper rail 11 is slidably guided in a longitudinal direction on a lower rail 10 fixed to the vehicle body of the automobile along the front-rear direction by 2 (only the front side is shown). Although illustration is omitted, as is well known, one pair of lower rails 10 and one pair of upper rails 11 are provided on the left and right, and both sides of the cushion frame of the seat are attached and supported on the left and right lower rails 10. The left and right upper rails 11 may be integrally connected by a cushion frame, or may be previously integrally connected by another connecting member.

The front and rear ends of a screw 26, which is arranged parallel to the longitudinal direction of the upper rail 11, are rotatably supported by a support casing 16 and a support member 17 which are bolted and fixed to the front and rear portions of the upper rail 11. The longitudinal movement thereof is blocked by a thrust washer 27 (only the rear portion is shown) provided at the front and rear end portions which are in contact with the support members 16 and 17. A front end portion of the screw 26 projects forward from the support casing 16, and a cover 18 forming a gear box is screwed and fixed to the support casing 16 to cover a considerable portion including the projecting front end portion.

As shown in FIGS. 1 and 2, the lower rail 1
A pair of upright portions 15a provided with holes 15b are formed in parallel with the bracket 15 which is screwed and fixed to the lower central portion of 0 through a mounting hole 15c. The housing 20 is composed of a gear housing 20a and a motor housing 20b that are integrally connected. The gear housing 20a has a nut 2
5 and a worm 24 that meshes with a worm gear 25a formed on the outer periphery of the nut 25 are rotatably supported, respectively, and a motor 28 provided inside the motor housing 20b is connected to the worm 24 by a coupling 29 so that the nut 25 is rotationally driven. The housing 20 is sandwiched between the upright portions 15a so that the nut 25 is coaxial with the hole 15b, and is screwed and fixed to the bracket 15 through the mounting hole 15d. The screw 26 is screw-engaged with the nut 25 through the hole 15b.

As shown in FIGS. 1 and 3, the screw 2
The leading end of 6 is supported by a hole 39 formed in the cover 18, and a driven gear 31 is coaxially fixed to the tip of the screw 26 between the support casing 16 and the cover 18. In the present embodiment, the driven gear 31 fits the long hole formed in the boss portion to the double chamfered portion at the tip of the screw 26 to transmit the rotation, but it may be attached by other means such as serration coupling. Good. A pair of idle gears 32a that mesh with the driven gear 31 at a considerable interval.
32b is an idle shaft 34a, 34b provided integrally.
Is a bearing hole 4 formed in the support casing 16 and the cover 18.
Both ends are rotatably supported by 0a and 40b (only the cover 18 side is shown).

As shown mainly in FIG. 3, the support casing 16 is formed with a V-shaped elongated hole 36 having the bisector A of the rotational axes of the idle gears 32a and 32b as the axis of symmetry. The V-shaped elongated hole 36 is formed in each idle gear 32a,
An arc R1 of the same radius r centered on the axis of rotation of 32b
It is composed of two arc-shaped portions 36a and 36b having R2 as the center line, and the joint portion is located on the driven gear 31 side.
On the other hand, at a position corresponding to the V-shaped long hole 36 of the cover 18,
2 with the same two arcs as the arcs R1 and R2 as the center line
A V-shaped elongated hole 37 composed of two arc-shaped portions is formed (see FIG. 1). The V-shaped elongated hole 37 is the same as the V-shaped elongated hole 36 except that the width of the hole is not necessarily the same as the V-shaped elongated hole 36.

As shown in FIGS. 1 and 3, the drive gear 30
The manual shaft 33 integrally formed with the drive gear 30 has V-shaped elongated holes 36 and 37 on both sides of the drive gear 30 so that each of the circular arcs R1. R2
Both ends are supported so that they can move freely along the direction. As shown by the solid line in each figure, the drive gear 30 has
In the state where it is located at the joining portion of the elongated holes 36 and 37, the driven gear 31 and the idle gears 32a and 32b are engaged with each other at the same time. Further, as shown by the chain double-dashed line 33A in FIG. 3, in the state where the manual shaft 33 is moved to the free end of one arc-shaped portion 36a of the V-shaped elongated hole 36,
The drive gear 30 meshes with one idle gear 32a, but disengages from the driven gear 31 and the other idle gear 32b, and the manual shaft 33 moves to the free end of the other arcuate portion 36b. In this state, the drive gear 30 meshes with the other idle gear 32b, but the meshing with the driven gear 31 and one idle gear 32a is released.

As shown in FIGS. 1 and 3, the support casing 16 and the cover 18 have a manual shaft 33 and a V-shaped elongated hole 3.
A pair of springs 3 that urges the joints of 6, 37
8 are provided. The spring 38 is a double-ended spring which is made of a wire material such as a piano wire and whose both bent ends are locked in holding holes 41 formed in the support casing 16 and the cover 18, and the central portion of the manual shaft 33 is bent by bending stress. The manual shaft 33 is brought into contact with the outer peripheral surfaces of both side parts and elastically urged toward the driven gear 31 side.
Is located at the joint of the V-shaped elongated holes 36 and 37. A handle 35 is attached to the front end of the manual shaft 33 through serration, and a snap ring 42 is engaged with a radial slit formed in a boss portion of the handle 35 and an annular groove formed in the manual shaft 33 to prevent the handle 35 from coming off. ing.

As described above, the lower rail 10 and the upper rail 11 are provided in pairs on the left and right, and the left and right upper rails 11 are integrally connected, but the nut 25, the screw 26, the motor 28, the gears 30, 31, 32
The mechanisms for moving the upper rails 11 such as a, 32b and the handle 35 may be provided in only one set or in both sets. Alternatively, this mechanism may be provided only once near the center of both sets.

Next, the operation of the above embodiment will be described. First, the adjustment of the seat position by the motor 28 will be described. In a normal state where no rotational force is applied to the handle 35, the manual shaft 33 is pressed and positioned by the V-shaped joint portion of the V-shaped elongated holes 36 and 37 by the spring 38, and the manual gear 33 is positioned.
Is a driven gear 31 and a pair of idle gears 32a and 32b.
At the same time, the driven gear 31 cannot rotate because it is meshed, and therefore the screw 26 cannot rotate. In this state, if the user operates the double throw type seat switch (see, for example, reference numeral 9 in FIG. 4) provided near the seat in the forward direction,
The motor 28 rotates the nut 25 in the direction of the arrow W1 in FIG. 2 via the worm 24 and the worm gear 25a, whereby the upper rail 11 and the seat attached thereto move in the forward direction, and when the seat switch is released, the position is changed. Stop at. On the contrary, if the seat switch is operated backward, the motor 28 rotates the nut 25 in the direction of arrow W2, whereby the upper rail 11 and the seat attached thereto move in the backward direction, and the seat switch is turned on. If you release it, it will stop at that position.

Next, manual adjustment of the seat position will be described. When the motor 28 is not operating, the nut 2
No. 5 cannot rotate due to the engagement of the worm 24 and the worm gear 25a. In this state, the user operates the handle 35 as shown in FIG.
When the driven gear 31 is rotated in the direction of arrow w1, the rotation of the driven gear 31 is hindered by the resistance between the lower rail 10 and the upper rail 11. Moves along the arc-shaped portion 36a. When the manual shaft 33 reaches the free end of the arcuate portion 36a, as shown by the chain double-dashed line 33A, the drive gear 30 and the handle 35 are in the positions shown by the chain double-dashed line 30A and the chain three-dot chain line 35A, and the drive gear 30 is idle. The gear 32a is still in mesh with the gear 32a, but the mesh between the driven gear 31 and the other idle gear 32b is released. After that, the rotation of the handle 35 in the w1 direction is transmitted from the drive gear 30 to the driven gear 31 via the idle gear 32a, and the screw 26 is rotated in the clockwise direction. As a result, the upper rail 11 and the seat attached thereto move in the backward direction, and when the hand is released from the handle 35, the upper rail 11 and the seat are stopped at that position, and the drive gear 30 and the handle 35 are returned to the original position indicated by the solid line by the spring 38. On the contrary, when the handle 35 is rotated in the direction of the arrow w2, the upper rail 11 and the seat attached thereto move in the forward direction, and when the handle 35 is released, the upper rail 11 and the seat are stopped at that position, and the drive gear 30 And the handle 35 returns to the original position shown by the solid line. During these operations, the handle 35 moves in the front-rear direction together with the seat.

As described above, according to the present embodiment, the seat position can be adjusted by the motor 28 when the handle 35 is not operated, and by the handle 35 when the motor 28 is not operating. You can

In the above embodiment, the nut 25 is attached to the lower rail 10 side through the bracket 15 and the screw 26
Is attached to the upper rail 11 side via the respective attachment members 16 and 17, but the present invention may be implemented by conversely attaching the nut 25 to the upper rail 11 side and the screw 26 to the lower rail 10 side. If the handle 3
In the case of operation by 5, even if the seat is moved, the handle 35
Does not move.

Further, the worm reduction mechanism is used as the interlocking mechanism for rotating the nut 25 by the motor 28 in the above embodiment, but any interlocking mechanism such as a spur gear device, a screw gear device, a bevel gear device is used. it can. However, in the case where the reverse drive from the nut 25 side to the motor 28 side is possible, a motor with a brake that restrains rotation when not operating is used as the motor 28, or a linkage mechanism between the motor 28 and the nut 25 is used. It is necessary to provide a one-way brake to prevent rotation of the nut 25 due to reverse driving.

[0020]

As described above, according to the present invention, since the seat position can be adjusted independently of each other by the motor and the handle, even if a problem occurs in the motor or its wiring. It is possible to adjust the seat position by the handle, and it is possible to perform extremely slight fine adjustment of the seat position, which is difficult with the motor. Further, since the screw cannot rotate when no force is applied to the handle, the seat position can be adjusted by the motor without any trouble.

[Brief description of drawings]

FIG. 1 is a partially exploded overall perspective view showing an embodiment of a seat slide device according to the present invention.

2 is an exploded perspective view showing a longitudinal drive portion of the embodiment shown in FIG. 1. FIG.

FIG. 3 is a front view of a driving portion by a handle of the embodiment shown in FIG.

FIG. 4 is a side view of an example of a seat slide device according to the related art.

[Explanation of Codes] 10 ... Lower Rail, 11 ... Upper Rail, 15 ... Bracket, 16 ... Support Casing, 17 ... Support Tool, 18 ... Cover, 25 ... Nut, 26 ... Screw, 28 ... Motor, 30 ... Drive Gear, 31 ... Driven gears, 32a, 32b
... idle gear, 33 ... manual shaft, 35 ... handle, 36
... V-shaped elongated holes, 36a, 36b ... Arc-shaped portions, 37 ... V-shaped elongated holes, 38 ... Spring.

Claims (1)

[Claims] 1. A seat slide device comprising a lower rail fixed to a vehicle body, and an upper rail on which a seat is mounted so as to be slidably guided in the lower rail in a longitudinal direction, and a seat slide device is provided at a front portion or a rear portion of one of the both rails. A fixed support casing and a supporting member, respectively, a screw arranged in parallel with the longitudinal direction and having front and rear end portions rotatably supported by the supporting casing and the supporting device, and a screw fixed to the supporting casing. A cover that covers the front end of the screw, a bracket fixed to the other of the rails, a nut that is rotatably supported by the bracket and screw-engages with the screw, and a motor that rotationally drives the nut. A driven gear mounted to transmit rotation to the front end of the screw, A pair of idle gears that are rotatably supported by the support casing and the cover at both intervals and mesh with the driven gears, and the bisectors of the rotation axes of the idle gears are symmetrical axes. A V-shaped V-shaped connecting part formed on the support casing so that the joint is on the driven gear side, and having two arc-shaped portions centered on an arc of the same radius centered on the rotation axis of each idle gear. The center line is a long hole and two arcs that are formed at positions corresponding to the V-shaped long hole of the cover and are the same as the V-shaped long hole.
A V-shaped elongated hole composed of two arc-shaped portions and a manual shaft are integrally formed, and the manual shaft is supported by both of the V-shaped elongated holes so as to be freely movable in the respective arc directions. A drive gear that meshes with the driven gear and both idle gears at the time of being located at the joint of the V-shape, a spring that elastically biases the manual shaft toward the joint of the V-shape, and a manual shaft. A seat slide device comprising a fixed handle.