JPH0523413Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a device that remotely controls the reflection angle of an automobile rearview mirror. The present invention relates to an electric remote control drive device having a structure that does not produce backlash in the thrust direction.

[Prior Art] An example of a drive device that automatically adjusts the reflection angle of a mirror by a motor is shown in FIG. The structure is such that it can swing (arrow A) in an arc shape around the center (for example, see Japanese Patent Publication No. 60-58054).
That is, the motor and the motor are installed in the housing 1 of the actuator unit for adjusting the reflection angle of the mirror, which is divided into two halves, a front half housing 1a on the front side of the vehicle and a rear half housing 1b on the rear side of the vehicle. Worm 2 attached to the output shaft
and a worm wheel 3 that meshes with the worm 2.

The worm wheel 3 has both ends fitted into annular support parts 8a and 8b provided on the front half housing 1a and the rear half housing 1b, respectively, so that the center line thereof is perpendicular to the mirror surface. A pivot screw 4 is inserted into the center of the wheel and is engaged to rotate integrally with the wheel. The pivot screw 4 has a hemispherical recess 5 formed on the back surface of its bottom plate 4A, and a hemispherical protrusion 6 provided on the front half housing side is fitted into this recess to adjust the pivot position of the pivot screw 4. It is supported so that it can be tilted in an arc shape as shown by arrow B around the center.

In addition, an adjuster nut 7 is engaged with the threaded portion 4B of the pivot screw, and the above-mentioned movable pivot P is formed at the tip of this adjuster nut, which is connected to the rear surface of the mirror holder, and is connected to the worm wheel 3 and the worm wheel 3 via the worm 2 by a motor. By rotating the pivot screw 4, the adjuster nut 7 is moved back and forth to adjust the inclination angle of the mirror.

[Problems to be solved by the invention] This type of drive device must be assembled to avoid mirror vibration (chatter), but due to dimensional variations (tolerances) of molded products or deviations that are inevitable during assembly, the pivot The disadvantage is that large play (play) tends to occur in the thrust direction of the Tsuto Screw. That is, in the conventional drive device, for example, the fifth
As shown in the figure, the backlash in the thrust direction is mainly caused by associativity between the combinations of the rear half housing 1b and the worm wheel 3, the front half housing 1a and the pivot screw 4, and the combinations of the worm wheel 3 and the pivot screw 4. It is thought that this occurs due to the fact that there is a problem, and its tuning requires a considerable amount of man-hours. Moreover, in order to enable the adjusting nut 7 to swing in an arc, the worm wheel 3 and the pivot screw 4 are
The lower fitting inner surface is formed into a spherical surface 3M, and the bottom plate of the pivot screw 4 is connected to the protrusion 6 with respect to this spherical surface.
The pivot screw 4, which forms the fitting surface with the spherical surface, contacts the curved surface 4N at the point of contact with the curved surface 4N of the spherical surface as shown in FIG. Since it is located close to the diameter line S, a slight deviation in component dimensions causes large play in the thrust direction, and this is the main reason why tuning is difficult.

SUMMARY OF THE INVENTION In view of the problems of the conventional type as described above, the present invention aims to provide an electric remote control drive device in which the worm wheel is set so as to prevent backlash in the thrust direction.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a motor, a worm mechanism driven by the motor, and a worm mechanism in a housing in which a front half housing and a rear half housing are fitted together. A back mirror for an automobile that accommodates an adjusting screw that moves in the front-rear direction as a wheel rotates, and also has a spherical catch on the back surface of the mirror holder and fits a spherical pivot formed at the tip of the adjusting screw. A device for adjusting the reflection angle of a mirror of the worm wheel, wherein one shaft end of the worm wheel is provided with a plurality of locking pieces that are screwed into the adjusting screw, and the other shaft end is provided with a plurality of locking pieces that adjust the thrust backlash of the worm wheel. It is characterized by providing a prevention means.

The prevention means includes an annular groove formed on the other shaft end of the worm wheel, a cylindrical portion provided on the bottom wall of the front half housing to rotatably fit the other shaft end of the worm wheel, and the cylindrical portion. A pair of slits formed in a direction perpendicular to the axis of the cylindrical part at opposing positions on the wall surface, and a spring pin commonly engaged with the annular groove at the end of the worm wheel shaft fitted into the cylindrical part and the slits. Become. Further, the prevention means includes forming a stepped protrusion on the other shaft end of the worm wheel to penetrate the bottom wall of the front half housing, and placing a washer at the end of the stepped protrusion that has passed through the worm wheel to prevent thermal caulking. It may also be done.

[Function] The worm wheel is subjected to thrust in the axial direction when the adjusting screw for adjusting the reflection angle of the mirror is rotated, but since the shaft end is provided with a thrust backlash prevention means, backlash can be prevented.

[Example] Hereinafter, the drive device of the present invention will be specifically explained based on the drawings. FIG. 1 schematically shows an electric remote control drive device, and FIG. 2 is an enlarged sectional view of the main parts of the drive device of the present invention. In the figure, 10 is a housing of an actuator unit for adjusting the reflection angle of the mirror, and this housing 10 is made up of a front half housing 11a and a rear half housing 11b that are separably fitted together. There is a center pivot 30 at the front center of the housing 10, which is the center of tilt of the mirror, and two adjuster screws 12 are provided projecting from the center pivot at a predetermined distance and orthogonal to each other. Rotation stopper 1 provided at the tip of screw 12
By fitting the spherical pivot 13 having a diameter of 3a into the spherical seat 15 formed on the back surface of the mirror holder 14, the mirror holder 14 is attached to the housing 10.
It is mounted so as to be tiltable about a central pivot 30. The housing 10 is used with the front half housing 11a side fixed to a mirror body (not shown).

Although FIG. 3 is an exploded perspective view with the rear half housing omitted, the housing 10 includes a motor 25, a worm 26 attached to the output shaft of the motor 25, and a worm wheel 16 that meshes with the worm 26. to accommodate. A plurality of thin flexible locking pieces 16 are provided at one shaft end of the worm wheel 16 to be screwed into the adjuster screw 12.
c is provided, and the other shaft end 16d is provided with means for preventing thrust rattling of the worm wheel.

As shown in FIGS. 2 and 3, this prevention means is provided at the bottom of the front half housing 11a so that the shaft end 16d is rotatably fitted into an annular groove 16a formed in the other shaft end 16d of the worm wheel. A cylindrical portion 18 provided on the wall, a pair of slits 18a formed in a direction perpendicular to the axis of the cylindrical portion at opposing positions on the wall surface of the cylindrical portion, and an annular groove 16a at the end of the worm wheel shaft fitted into the cylindrical portion 18. and a spring pin 17 commonly engaged with the slit 18a. Note that the worm wheel 1
6 is provided with a hollow shaft so as not to interfere with the axial movement of the adjusting screw 12, and the locking piece 16c is provided on the end surface 16b on the rear half housing side.
is formed protrudingly.

Since a plurality of thin flexible locking pieces 16c provided on the upper end 16b of the inner cylinder on the rear half housing side of the worm wheel 16 are screwed into the adjuster screw 12 having the rotation stopper spherical pivot 13, the worm wheel 16 is converted into a back-and-forth movement of the pivot screw 12 by the screwing of the thin-walled flexible locking piece 16c, and the rotational movement of the pivot screw 12 is converted into a back-and-forth movement of the pivot screw 12 by the thin-walled flexible locking piece 16c as shown in FIG. The swing movement (arrow A) about the mirror's pivot center 30 is made possible as shown in FIG. In the illustrated example, a plurality of flexible claws are used as the locking piece 16c, but the worm wheel 16 may be replaced with a spring pin (not shown).

With the above configuration, the worm wheel 16 of the worm mechanism driven by the motor is formed via a spring pin 17 inserted through a slit 18a provided in the cylindrical portion 18 of the front half housing, which is a means for preventing thrust backlash. The rotating fitting part prevents backlash in the thrust direction and allows for smooth rotation. Said rotational movement of the worm wheel 16 is then converted into a back and forth movement of an adjusting screw having a rotation stopper pivot screwed into the locking piece 16c of the wheel.

The threaded engagement between the worm wheel 16 and the adjusting screw 12 by the thin flexible locking piece allows the mirror to swing around the central pivot 30, and the tilt angle of the mirror can be easily adjusted. .

FIG. 4 shows a two-stage stepped boss 21 provided on the shaft end 20 of the worm wheel 16 on the front half housing side, which is inserted into a through hole 22 provided at the center of the cylindrical portion 18 of the front half housing, and a washer is attached to the tip of the boss 21. A second embodiment is shown in which another thrust backlash prevention means is thermally caulked via 23 and a rotational fitting portion is formed between the front half housing and the front half housing. In this case, the stepped boss and the through hole 2
Only the fitting tolerance with 2 becomes a problem, and the occurrence of dimensional variations during molding can be suppressed to a small level.

[Effects of the invention] As described above, the invention provides an adjustment screw having a rotation stopper pivot for adjusting the angle on the back surface of the mirror, and a thin flexible locking piece that is screwed onto the adjustment screw. Since the worm wheel is set using a rotary fitting part provided on the front half housing, the play in the worm wheel inside the housing can be minimized unlike the conventional type, and the number of man-hours required for tuning during assembly can be reduced. reduction can be achieved. Moreover, since the backlash in the thrust direction caused by the above-mentioned dimensional deviation is less likely to occur, it is possible to prevent the occurrence of specular vibration.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of the electric remote control drive device;
Fig. 2 is an enlarged sectional view of the main parts of the drive device of the present invention, Fig. 3 is an exploded perspective view with the rear half housing omitted, and Fig. 4 is an enlarged sectional view of the main parts showing the second embodiment of the invention. FIG. 5 is a sectional view of the conventional type, and FIG. 6 is a sectional view of the main part of the same. 10... Housing, 12... Adjustment screw, 13... Spherical pivot, 14... Mirror holder, 15... Spherical catch, 16... Worm wheel, 16a... Annular groove, 16b... End surface,
16c...Locking piece, 17...Spring pin, 1
8... Cylindrical part, 18a... Slit, 16d, 2
0...Shaft end, 21...Stepped boss, 22...Through hole, 23...Washer, 30...Center pivot.

Claims (1)

[Claims for Utility Model Registration] 1. A motor and a worm mechanism driven by the motor in a housing in which a front half housing and a rear half housing are fitted together;
The mirror holder accommodates an adjusting screw that is driven in the front-back direction of the mirror by rotation of a worm wheel, and a spherical seat is provided on the back surface of the mirror holder to fit a spherical pivot formed at the tip of the adjusting screw. A device for adjusting the reflection angle of a back mirror for an automobile, wherein a plurality of locking pieces are provided at one shaft end of the worm wheel to be screwed into the adjusting screw, and a worm wheel is provided at the other shaft end. An electric remote control drive device characterized by being provided with a means for preventing thrust rattling of a wheel. 2. The prevention means includes an annular groove formed on the other shaft end of the worm wheel, a cylindrical portion provided on the bottom wall of the front half housing to rotatably fit the other shaft end of the worm wheel, and A pair of slits formed in a direction perpendicular to the cylindrical axis at opposing positions on the wall surface of the part, and a spring pin commonly engaged with the slit and an annular groove at the end of the worm wheel shaft fitted into the cylindrical part. An electric remote control drive device according to claim 1, which is a utility model. 3. The prevention means includes forming a stepped protrusion on the other shaft end of the worm wheel to penetrate the bottom wall of the front half housing, and placing a washer at the end of the stepped protrusion that has passed through and thermally caulking it. An electric remote control drive device according to claim 1, characterized in that the electric remote control drive device is characterized in that: