JPH0326029Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a power seat truck driven by a motor.

(Prior Art) As a power seat truck, it has been known that screws are arranged in parallel on the upper rail using a screw bracket, and the upper rail is moved along the lower rail using the driving force of a motor using the screws. It is being In this conventional power seat truck, the upper rail is moved by bringing the motor or the gearbox attached to the motor into contact with the screw bracket, or by bringing the sliding body provided between the lower rail and the upper rail into contact with a stopper. It was regulated.

(Problem to be solved by the invention) When a human drives the Atsupa rail, the speed of movement is usually reduced when the Atsupa rail comes close to the stop position at the end of the Atsupa rail, so the impact when the Atsupa rail stops is relatively small, but the motor In the case of the drive, since the moving speed is constant, the conventional device has a problem in that the impact at the stop position is large.

This idea was created in view of this problem.
The purpose is to provide a power seat truck that has a simple structure, can absorb shock at a stopped position, is inexpensive, and produces less noise during use.

(Means for Solving the Problems) The present invention to solve the above-mentioned problems uses screw brackets to arrange screws in parallel on the upper rails, and uses the screws to connect the upper rails to the lower rails using the driving force of a motor. In the power seat track that is moved along the power seat track, a stopper having a large diameter portion that absorbs the impact, a small diameter portion that contacts the screw bracket, and a female threaded portion that engages with the screw is provided, and the stopper has a large diameter portion that absorbs the impact. It is characterized in that a recess having a diameter at least equal to or larger than the female thread portion is formed in the end face of the diameter portion.

(Function) In the power seat truck of the present invention, before the top rail stops, the large diameter portion of the stopper is first pushed and deflected, and this deflection absorbs the impact.

(Embodiment) Hereinafter, an embodiment of the power seat truck of the present invention will be described using FIG. 1 and FIG. 2.

In the figure, 1 is an upper rail to which a seat cushion frame (not shown) is fixed. and,
The upper rail 1 is fitted to a lower rail 7 which is fixed to the floor 2 by riveting it with rivets 6 to a bracket 5 which is attached to the floor 2 using bolts 3 and washers 4 so as to be movable in the longitudinal direction. . A screw bracket 10 is attached to one end of the upper rail 1 using a bolt 8 and a washer 9.
A through hole 10a is formed through which a small diameter threaded portion 11a of a screw 11 arranged in parallel with the lower rail 7 is inserted. The small diameter screw portion 11a inserted through the through hole 10a is attached to the screw bracket 10 using a nut 12 and a washer 13. A motor bracket 15 is riveted to the lower rail 7 using rivets 14, and a motor 18 is attached to the motor bracket 15 using screws 16 and washers 17. A worm gear 19 is attached to the output shaft 18a of the motor 18 orthogonal to the screw 11, and the worm gear 19 is attached to the lower rail 7 with bolts 20, 21 and washers 22, 2.
It is inserted into the gearbox 24, which is mounted using 3. The worm gear 19 meshes with a worm wheel portion 25a at the center of the gear nut 25 within the gear box 24. Cylindrical portions 25b, 25c are formed at both ends of the gear nut 25, and thrust bearings 26,
27 is fitted, and the gear nut 25 is connected to the gear box 2.
It is rotatably supported within 4. gear nut 2
5 includes a worm wheel portion 25a, a cylindrical portion 5b,
25c, the large diameter threaded portion 1 of the screw 11
A threaded portion 25d is provided to be screwed into the portion 1b.
Therefore, the driving force of the motor 18 rotates the gear nut 25 via the worm gear 19. As the gear nut 25 rotates, the screwing position between the screw 11 and the gear nut 25 moves relatively;
Since the gear nut 25 is rotatably supported within the gear box 24 provided on the lower rail 7 fixed to the floor 2, the upper rail 1 provided with the screw 11 moves along the lower rail 7. A stopper 28 is provided on the surface of the screw bracket 10 facing the gear box 24, and is provided with a female threaded portion 28a that engages with the large diameter threaded portion 11a of the screw 11. The stopper 28 is integrally formed of an elastic material such as hard urethane, and is connected to the screw bracket 10.
It has a small diameter part 28b that abuts against the gear box 24, and a large diameter part 28c that faces the gear box 24, and a recess 28d having a diameter at least larger than the female thread part 28a is formed in the end surface of the large diameter part 28c.

Next, the operation of the above embodiment will be explained. First, the motor 18 is operated to move the upper rail 1 in the direction of the arrow in FIG. When the upper rail 1 moves to the vicinity of the final stop position, the end surface of the gearbox 24 comes into contact with the large diameter portion 28c of the stopper 28. Since the large diameter portion 28c has a recess 28d, it is pushed by the end face of the gearbox 24 and flexes. This deflection absorbs the impact at the stop position.

According to the above structure, the impact at the stop position can be absorbed with a simple structure in which the stopper 28, which is made by integrally molding an elastic body, is screwed onto the screw 11. Since the stopper 28 is an integrally molded product, the cost is low. Since the stopper 28 is screwed into the screw 11, the noise generated by these while the vehicle is running is extremely small.

Note that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways.

(Effects of the invention) As explained above, according to the invention, it is possible to realize a power seat truck that has a simple structure, can absorb shock at the stop position, is inexpensive, and produces less noise during use. be able to.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1... Atsupareru, 2... Floor, 3, 8,
20, 21...Bolt, 4, 9, 13, 17, 2
2, 23...washia, 5...bracket, 6,
14...Rivets, 7...Lower rail, 10...
Screw bracket, 10a...through hole, 11
...Screw, 11a...Small diameter screw part, 11b
...Large diameter threaded portion, 12...Nut, 15...Motor bracket, 16...Screw, 18...Motor,
18a... Output shaft, 19... Worm gear, 24
...Gear box, 25...Gear nut, 26,
27... Thrust bearing, 25a... Worm wheel part, 25b, 25c... Cylindrical part, 25
d, 28a...Female thread part, 28...Stopper, 2
8b...Small diameter part, 28c...Large diameter part, 28d...
dimple.

Claims (1)

[Scope of utility model registration request] In a power seat truck in which screws are arranged side by side on an upper rail using a screw bracket, and the screws are used to move the upper rail along a lower rail by the driving force of a motor, a large diameter portion that absorbs shock, A stopper is provided which has a small diameter portion that comes into contact with the bracket and a female threaded portion that engages with the screw, and a recess having a diameter at least equal to or larger than the female threaded portion is provided on the end surface of the large diameter portion of the stopper that absorbs the impact. A power seat truck featuring the following features.