JP2556121Y2 - Anti-vibration structure for automotive seats - Google Patents

Description

[Detailed description of the invention]

[0001]

INVENTION The present invention relates to a vibration prevention structure of the automotive sheet over door.

[0002]

Conventionally, automotive sheet over the door, for example Pawashi
As shown in FIGS. 3 and 4, a seat 2 is supported by a slider 1, and a worm wheel 4 connected to a screw shaft 3 attached to the seat 2 by serration is provided in a casing 5, as shown in FIGS. A worm wheel 4 is rotated by a worm 7 driven by a motor, and the seat 2 is moved forward and backward by rotation of a screw shaft 3 screwed to a slide nut 6 mounted on the vehicle body floor side. .

At one end 3a of the screw shaft 3, a bolt 3b, a serration shaft 3c (see FIG. 5), and a small diameter smaller than the inner diameter of the serration shaft 3c are provided at the base of the serration shaft 3c. A shaft portion 3d is formed, and a serration hole portion 4a is formed in the inner periphery of the worm wheel 4 (see FIG. 5).
To form And the small shaft portion 3 of the one end portion 3a of the screw shaft 3
d, the serration hole 4a of the worm wheel 4 is inserted into the serration shaft 3c, the washer 9 is inserted into the bolt 3b, and the nut 10 is fastened to the bolt 3b. , 9 between which the worm wheel 4 is held. In addition,
Reference numeral 11 denotes a metal stopper welded and fixed to the screw shaft 3 and is stopped by the slide nut 6 to regulate the backward position of the seat 2.

[0004]

However, the screw shaft 3 is made of metal for maintaining strength, while the worm wheel 4 is made of synthetic resin for preventing operation noise. Therefore, the serration hole 4a of the worm wheel 4
Since it is necessary to provide a relatively large draft angle (gradient) θ in order to facilitate die removal during molding, when it is fitted into the serration shaft portion 3 c of the screw shaft 3, the serration hole portion of the worm wheel 4 A gap t occurs between the screw shaft fitting side 4a and the base side of the serration shaft portion 3c of the screw shaft 3. For this reason, when the worm wheel 4 is rotated by the worm 7, the existence of the gap t causes the worm wheel 4 to vibrate (rattle) in the radial direction.
With the vibration of the worm wheel 4, the other end of the screw shaft 3 also vibrates (rattles) in the radial direction, so that the load acting on the motor changes and the motor operation noise (abnormal noise) is generated. In addition, there was a problem that the slider did not slide smoothly.

An object of the present invention, in the sheet over <br/> preparative automobiles, with reduced operating noise of the motor (abnormal sound) due to vibration of the worm wheel at the front and rear or vertical movement, the slider there is to provide a vibration preventing structure capable slides or the like smoothly.

[0006]

To achieve the above object of the Invention The present invention is a worm wheel coupled with the serration to the screw shaft attached to the sheet over preparative, rotated at worm driven by a motor, a slide in automotive sheet over preparative for longitudinal or vertical movement of the various parts of interest over preparative by the rotation of the screw shaft screwed into the nut, the screw shaft insertion side of the serration hole of the worm wheel, than the inner diameter of the serrated hole A large diameter fitting hole is also formed, and a fitting shaft portion having a diameter larger than the outer diameter of the serration shaft portion and fitting into the fitting hole of the worm wheel is formed at the base of the serration shaft portion of the screw shaft. It is characterized by being formed.

[0007]

According to the vibration preventing structure of the present invention, the fitting shaft of the serration shaft of the screw shaft is fitted into the fitting hole of the serration hole of the worm wheel. Due to this fitting, even if there is a gap between the serration hole of the worm wheel and the serration shaft of the screw shaft, the worm wheel does not easily vibrate in the radial direction, and accordingly the screw shaft also vibrates in the radial direction. not easily, since the change in the load acting on the motor is reduced, the motor of the operating noise (abnormal noise) is reduced, the slider is to <br/> so that the slide or the like smoothly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. The parts having the same configuration and operation as those of the prior art in FIG. 4 are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIGS. 1 and 2, a worm wheel 4 made of synthetic resin has a serration hole 4a formed on the inner periphery thereof.
A relatively large draft (gradient) angle is provided to facilitate die release during molding. Serration hole 4a
On the fitting side of the screw shaft 3, a fitting hole 4b having a predetermined depth (for example, about 1/4 of the entire length of the worm wheel 4) d and having a diameter larger than the inner diameter of the serration hole 4a is formed. I have.
The fitting hole 4b is preferably a straight hole in which no serration is formed.

On the other hand, one end 3a of the screw shaft 3 has a bolt portion 3b, a serration shaft portion 3c, and a base portion of the serration shaft portion 3c having a diameter larger than the outer diameter of the serration shaft portion 3c. A fitting shaft portion 3e whose end is fitted into the fitting hole 4b of the wheel 4 is formed. The fitting shaft portion 3e
Is preferably approximately the same as the outer diameter of the thread root of the screw shaft 3. The fitting shaft 3e has a stopper 12 made of a synthetic resin.
Is provided. It is preferable that the stopper 12 be outsert-molded to the fitting shaft 3e and fixed integrally to the fitting shaft 3e. A hollow portion 12a is formed at the contact portion of the stopper 12 with the slide nut 6, so that the cushion can absorb a shock at the time of stopping.

With the above configuration, the bolt portion 3 of the screw shaft 3
b, the fitting hole 4b of the worm wheel 4 is fitted into the fitting shaft 3e by passing through the serration shaft 3c, and is brought into contact with the end of the stopper 12 while the fitting hole 4b of the worm wheel 4 is fitted. . The serration hole 4a of the worm wheel 4 is engaged with the serration shaft 3c of the screw shaft 3, and the worm wheel 4 is connected to the screw shaft 3. Thereafter, the washer 9 is fitted into the bolt portion 3b, and the nut 10
Is fastened to the bolt portion 3b to hold the worm wheel 4 between the washer 9 and the stopper 12.

In this state, even if there is a gap t due to the draft angle between the serration hole 4a of the worm wheel 4 and the serration shaft 3c of the screw shaft 3, the fitting hole 4b of the worm wheel 4 has the screw shaft. Since the worm wheel 4 is fitted to the fitting shaft portion 3e of the third worm wheel 3, the worm wheel 4 is less likely to vibrate in the radial direction. As described above, when the worm wheel 4 is less likely to rattle, the screw shaft 3 is also less likely to rattle in the radial direction. As a result, the change in the load acting on the motor decreases, so that the operating noise (abnormal noise) of the motor decreases and the slider 1 slides smoothly. Also, since the diameter of the fitting shaft 3e of the screw shaft 3 is made larger than that of the serration shaft 3c, the screw shaft 3
Also improves the strength. In the above embodiment, the sheet
2 was a worm wheel 4 for moving back and forth
However, it goes without saying that the present invention can also be applied to a worm wheel such as a lifter that moves the seat 2 up and down .

[0013]

As is apparent from the above description, according to the seat vibration preventing structure of the present invention, the fitting shaft portion of the screw shaft serration shaft portion is fitted in the fitting hole of the serration hole portion of the worm wheel. It is designed to fit. Therefore, the worm wheel and the screw shaft are less likely to vibrate in the radial direction, and a change in the load acting on the motor is reduced, so that the motor operation noise (abnormal noise) is reduced and the slider slides smoothly. Become. Also, the structure is extremely simple and can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a mission portion of the present invention.

FIG. 2 is a sectional view of the transmission portion.

FIG. 3 is a side view of the power seat.

FIG. 4 is a sectional view of a conventional mission portion.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Slider, 2 ... Seat, 3 ... Screw shaft, 3a ... One end part, 3c ... Serration shaft part, 3e ... Mating shaft part, 4 ... Warm wheel, 4a ... Serration hole part, 4b ... Mating hole, 7 ... Warm.

Claims (1)

(57) [Scope of request for utility model registration] The method according to claim 1 worm wheel coupled with the serration to the screw shaft attached to the sheet over preparative, rotated at worm driven by a motor, interest over preparative by the rotation of the screw shaft screwed into the sliding nut in automotive sheet over preparative for longitudinal or vertical movement of the various parts, the screw shaft insertion side of the serration hole of the worm wheel, than the inner diameter of the serration hole are formed fitting holes of a large diameter, the screw shaft serration the base of the shaft portion, a larger diameter than the outer diameter of the serration shaft portion, the vibration of the automobile sheet over preparative, wherein the fitting shaft portion fitted into the fitting hole of the worm wheel is formed Prevention structure.