JPH06261488A - Waterproof device for motor - Google Patents

Abstract

PURPOSE:To provide an inexpensive waterproof device for motor in which no waterproof cover is used and accuracy is ensured without cutting the frame. CONSTITUTION:A bracket is press fit to microprotrusions 11 provided partially at several points in the peripheral direction on the open end of a frame 1 in order to keep airtightness in the peripheral direction. Microrecesses 12 having peripheral width shorter than that of the microprotrusion are provided in the center of the end face of microprotrusion. Accuracy of end face is then set for the remaining part 13 of microrecesses and the end face is abutted on the plane of the bracket thus keeping airtightness in the axial direction. This structure provides a waterproof device for motor without requiring any waterproof cover or cutting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor required to be waterproof, and more particularly to a motor used for automobile equipment.

[0002]

2. Description of the Related Art In recent years, electronics has become remarkable, especially in the field of automobiles, and motors have come to be used more frequently. However, depending on the mounting position, it is necessary to make the motor waterproof.
Various measures have been taken to the waterproof structure.

Hereinafter, the waterproof structure of the conventional motor described above will be described with reference to FIGS. 5 and 6.

As shown in FIG. 5, a bracket 2 is press-fitted or crimped into a frame 1 to hold a rotor 5 (details of the rotor 5 are not shown). However, since the press-fitting or crimping portion is a drawn product of an iron plate for both the frame 1 and the bracket 2, the roundness cannot be ensured over the entire outer diameter or inner diameter of the frame 1, and the squareness of the end surface 14 of the frame 1 is also increased. Since it cannot be ensured over the entire area, a gap occurs and waterproofness cannot be ensured. Therefore, the waterproof cover 3 is covered so that the drainage hole 16 provided in the frame 1 and the drain pipe 4 provided in the waterproof cover 3 are aligned with each other.

Further, as shown in FIG. 6, since the frame 1 is inaccurate as described above, the end face of the frame 1 is cut by about 5 to 10 mm to form the step 17 and the thin portion 18.
After inserting the bracket 2 with high precision, the thin portion 18 is caulked. A drain pipe 4 is installed in the drainage hole 16 of the frame 1.

[0006]

In such a conventional waterproof device for a motor, the waterproof cover 3 in the device shown in FIG. 5 is used.
In the apparatus shown in FIG. 6, the frame 1 needs to be cut, and both require an extra material and processing for maintaining waterproofness.

The present invention solves the above problems, and provides an inexpensive motor waterproofing device that does not require extra materials or processing for maintaining waterproofness.

[0008]

In order to achieve the above-mentioned object, the motor prevention device of the present invention is provided with a motor opening 5 from the frame opening end.
To 10 mm, several small intervals are provided in the outer peripheral direction or the inner diameter direction, and a minute concave part narrower than the circumferential width of this minute convex part is provided in the center of the end face of the minute convex part. And the end faces other than the minute recesses are brought into contact with the flat surface of the bracket.

[0009]

With the above-described structure, the present invention can ensure the waterproofness of the motor without requiring any extra material or processing.

[0010]

Embodiment An embodiment of the present invention will be described below with reference to FIG.
It will be described with reference to FIG.

As shown in FIG. 1A, the frame 1 includes
Since roundness cannot be achieved over the entire outer circumference, minute convex parts 11 are formed in the outer peripheral direction with several intervals in the axial direction from the opening end to a distance of 5 to 10 mm. The degree is secured. Further, a minute concave portion 12 narrower than the circumferential width of the minute convex portion 11 is formed in the center of the end face of the minute convex portion 11, and the end face 1 of the remaining portion 13 other than the minute concave portion 12 is formed.
Only 4 has a squareness.

Further, FIG. 2A shows a state in which the bracket 2 is press-fitted into the minute convex portion 11 to maintain airtightness,
Since there is the minute concave portion 12, a slight gap is formed on the inner surface of the bracket 2. 3A shows that the end surface 14 of the remaining portion 13 of the frame 1 is in contact with the flat surface of the bracket 2 to keep airtightness. In this portion, the remaining portion 13 of the frame 1 makes a slight gap in the inner peripheral direction of the bracket 2.

However, in these gaps, since the width of the minute concave portion 12 is narrower than the width of the minute convex portion 11, the airtightness of the entire circumference is maintained.

FIG. 4A shows an overall image of the motor, showing a state in which the bracket 2 is press-fitted into the frame 1 and the drain pipe 4 is attached to the drain hole 16.

1 (b) to 4 (b) show a case where a minute convex portion 15 is formed in the inner peripheral direction of the frame 1 and has the same structure as described above.

As described above, according to the motor waterproof device of the present embodiment, the outer periphery and the end face of the frame 1 can be partially made precise and the airtightness can be secured. A water resistance test of JIS-D-0203 was conducted on the motor of this example, but it was confirmed that there was no problem at all.

[0017]

As is apparent from the above embodiments, according to the present invention, the waterproof property can be secured only by devising the drawing process of the iron plate, and no extra waterproof cover or process is required, and the motor is inexpensive. Can provide the waterproof device.

[Brief description of drawings]

FIG. 1A is a perspective view showing that a minute convex portion is formed on the outer circumference of a frame of a motor waterproof device according to an embodiment of the present invention. FIG. 1B is a perspective view showing that a minute convex portion is formed on the inner circumference of the frame. Perspective view

FIG. 2A is a partial cross-sectional view showing that the bracket is press-fitted into the outer peripheral minute convex portion of the frame, and FIG. 2B is a partial sectional view showing that the bracket is press-fitted into the inner peripheral minute convex portion of the frame.

FIG. 3 (a) is a partial cross-sectional view showing that the frame end surface and the bracket plane are in contact with each other when the bracket is press-fitted on the outer circumference of the frame. (B) The frame when the bracket is press-fitted on the inner circumference of the frame Partial cross-sectional view showing that the end surface and the bracket flat surface are in contact with each other.

FIG. 4A is a schematic front sectional view of the motor when the bracket is press-fitted to the outer periphery of the frame. FIG. 4B is a schematic sectional front view of the motor when the bracket is press-fitted to the inner periphery of the frame.

FIG. 5 is a schematic front sectional view showing a conventional waterproof device for a motor.

FIG. 6 is a schematic front sectional view showing another conventional waterproof device for a motor.

[Explanation of symbols]

 1 frame 2 bracket 3 waterproof cover 4 drain pipe 5 rotor 11 outer peripheral direction minute convex portion 12 minute concave portion 13 remaining portion 14 end face 15 inner peripheral direction minute convex portion 16 drainage hole 17 stepped portion 18 thin portion

Claims (2)

[Claims] 1. A motor comprising a cup-shaped frame and a bracket formed by drawing an iron plate, the bracket being press-fitted and held at an opening end of the frame, wherein a plurality of portions are located 5 to 10 mm from the opening end of the frame. A minute convex portion is provided in the outer circumferential direction with a space in between, and a minute concave portion narrower than the circumferential width of the minute convex portion is provided at the center of the end face of the minute convex portion, and the minute convex portion is used as the press-fitting portion of the bracket. A waterproof device for a motor, wherein an end surface other than the recess is brought into contact with the flat surface of the bracket. 2. The waterproof device for a motor according to claim 1, wherein the minute convex portions of the frame are provided in an inner peripheral direction.