JPH0112993Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waterproof structure for the drive portion of an outside mirror used in automobiles and the like.

The outside mirror is equipped with a drive section for freely adjusting the direction of reflection. For example, in an outside mirror having a conventional structure as shown in FIGS. 1 to 3, a drive portion casing is constituted by a casing body 1 and a casing lid 2. The mirror 3 is fixed to a mirror body 4, and the mirror body 4 is rotatably supported by the drive unit casing body 1 via a pivot joint 5.

A drive motor 6 and a reduction gear device 7 are housed in the drive unit casing, and operate the advancing rod 8 back and forth in the direction of the shaft center. The advancing/retracting rod 8 is connected to the mirror body 4 via a pivot joint 9, and the mirror body 4 and the mirror 3 are rotated about the pivot joint 5 by the forward and backward movement of the advancing/retracting rod 8. In order to make the drive unit casing, which is composed of the casing body 1 and the casing lid 2, into a sealed structure and protect the internal reduction gear device 7, etc., an annular groove is formed on the mating surface of the casing body 1 and the casing lid 2. 11 is provided, and an annular packing (for example, an O-ring) 10 is interposed therein. That is,
As shown in FIG. 3, an O-ring groove 11 is provided on the mating surface of the casing body 1, and a rising wall 12 is formed by extending the inner wall surface 11a toward the casing lid 2, which is a mating member. do. Since the O-ring groove 11 has an annular shape along the outer circumference of the casing, the rising wall formed by extending the inner peripheral wall surface 11a has a short cylindrical shape. The inner circumferential surface C of the mating portion of the casing lid 2 is configured to come into contact with the outer circumferential surface B of the cylindrical rising wall 12, and the contact portion and the O-ring seal the drive unit casing. A structure has been established.

However, in such a conventional example, since an O-ring is used in the sealing structure of the drive part casing, it takes a lot of man-hours to drop the seal (O-ring) 10 into the O-ring groove 11 of the casing body 1. However, there were problems in that the number of O-ring parts was large, which increased assembly man-hours and increased manufacturing costs.

The present invention was developed in view of the problems of the conventional examples.
To provide a waterproof structure for a drive part of an outside mirror that has a small number of parts and is easy to assemble.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that structures corresponding to conventional structures will be described with the same reference numerals.

Figure 4 shows the casing body 1 and the casing lid 2.
The drive unit casing is comprised of the following.
The mirror 3 is fixed to a mirror body 4, and the mirror body 4 is rotatably connected to the drive unit casing body 1 via a pivot joint 5.
A drive motor (not shown) and a reduction gear device 7 are housed in the drive unit casing.
The advancing/retracting rod 8 is moved back and forth in the direction of the shaft center. The above-mentioned advancing/retracting rod 8 is connected to the mirror body 4 via a pivot joint 9, and the mirror body 4 and the mirror 3 are rotated about the pivot joint 5 by the forward and backward movement of the advancing/retracting rod 8.

The drive unit casing composed of the casing body 1 and the casing lid 2 is made into a sealed structure,
The sealing structure for protecting the internal reduction gear device 7, etc. has a trapezoidal cross-section in which a convex portion 2a having a trapezoidal cross-section protruding from the casing lid 2 is fitted to the mating surface of the casing body 1 with the casing lid 2. A recessed portion 1a is currently provided. A groove 1b is formed at the bottom of the recess 1a. Further, a convex portion having a trapezoidal cross section is formed in an annular shape on the surface of the casing lid 2 that is mated to the casing body 1. The protrusion 2a of the casing lid 2 is formed slightly larger than the recess 1a of the casing body 1.

After a drive motor (not shown) and a reduction gear device 7 are housed in the casing body 1 and the casing lid 2, a convex portion 2a and a concave portion 1a formed in an annular shape on the mating surfaces of the two are fitted, and a screw etc. Casing body 1 and casing lid 2 can be fixed using any fixing means.
and fix it. At this time, since the protrusion 2a protruding from the casing lid 2 is slightly larger than the recess 1a provided in the casing body 1, when the protrusion 2a is press-fitted in the X direction, both side walls 1c of the recess 1a are Due to the action, it expands slightly in the M direction, and the side surface 2 of the convex portion 2a
Press against b. Therefore, the casing main body 1 and the casing lid 2 are reliably sealed by pressure contact between the side walls 1c and the side surfaces 2b of the trapezoidal recess 1a and the trapezoidal projection 2a formed on their mating surfaces. That is,
Since the casing body 1 and the casing lid 2 are assembled and sealed simultaneously, it is possible to obtain a waterproof structure that is extremely simple, has a small number of parts, and is inexpensive to manufacture.

As described above, the present invention includes a casing consisting of a casing body and a casing lid, and an annular convex portion is formed on one of the mating surfaces of the casing body and the casing lid, and the annular convex portion is formed on the mating surface of the other member. This outside mirror is characterized by forming a concave part into which a convex part formed in an annular shape fits, and therefore has an extremely simple structure and can construct a waterproof structure at the same time as the drive part casing is assembled. This provides a waterproof structure for the drive unit.

It should be noted that, as a matter of course, the present invention is not limited to the above-mentioned embodiments.

[Brief explanation of the drawing]

Figures 1 to 3 show the drive section of a conventional outside mirror, with Figure 1 being a partially broken sectional view seen from the rear side of the mirror, and Figure 2 being a partially broken sectional view seen from the side of the mirror. 3 is an enlarged sectional view showing the joint between the casing body and the casing lid, and 4 is a sectional view.
Figures 6 to 6 show the waterproof structure of the drive section of the outside mirror of the present invention. Figure 4 is a cross-sectional view of the main parts seen from the side of the mirror, and Figure 5 shows the casing body and casing lid. FIG. 6 is an enlarged sectional view showing the mating surface of the casing body and the casing lid before assembly. FIG. 1... Casing body, 2... Casing lid,
3...Mirror, 4...Mirror body, 5...Pivot joint, 7...Reduction gear device, 8...Advancing/retracting rod,
1a... recess, 1b... groove, 1c... side wall, 2a
...Convex portion, 2b...Side surface.

Claims (1)

[Scope of utility model registration request] The casing includes a casing body and a casing lid, and an annular convex portion is formed on one of the mating surfaces of the casing body and the casing lid, and the annular convex portion is formed on the mating surface of the other member. A waterproof structure for a drive part of an outside mirror, characterized by forming a recess into which a part fits.