JPH10108401A - Device for waterproofing bearing of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved waterproof electric motor. SOLUTION: A ring-shaped bearing supporting part 6 which supports a bearing 5 for supporting a rotating shaft 4 passing through a bracket 1 is formed inside the bracket 1 mounted on a stator 2 and a ring-shaped rib 7 projecting in the axial direction outside. A drain board 8 of nearly disc-shape passed through over the upper part of the ring-shaped rib 7 and a waterproofing cover 10 of nearly closed-end cylindrical shape with the bottom, having a through hole 9 at its center outside the drain board 8 and fitted to the outer circumference of the ring-shaped rib 7, are provided on the rotating shaft 4. A projecting part is provided over the entire circumference of the fitted surface to the ring- shaped rib 7 inside water-proof cover 10. Also formed are a flange for covering the top of the ring-shaped rib 7 at the bottom end of outer circumference of the drain board 8, a drain groove on the inner side of the cylindrical part of the water-proof cover 10, and a drain hole at the bottom end of the cylindrical part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing waterproof device for an electric motor.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, a conventional motor has a bearing 5 inside a bracket 1 attached to a stator 2. As shown in FIG.
A bracket 1 having an annular bearing holding portion 6 for holding the inner side and an outer side having an annular rib 7 protruding in the direction of the rotating shaft 4 is mounted, and a substantially disc-shaped drainer fitted to the rotating shaft 4 is attached. A plate 8 and a substantially cylindrical waterproof cover 10 with a bottom fitted on the outer periphery of the annular rib 7 are disposed outside the plate 8. In this case, if the shaft is set in the vertical or horizontal direction, the water that has flowed along the rotating shaft will accumulate, causing water to enter the bearings, causing rust, or causing problems such as flowing into the motor through the bearings and causing poor insulation. I have.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an electric motor in which the bearing has improved waterproofness even when the electric motor shaft is in a vertical or horizontal direction. With the goal.

[0004]

In order to achieve the above object, an annular bearing holding portion for holding a bearing for supporting a rotating shaft penetrating through the bracket is provided inside a bracket attached to the stator. An annular rib protruding outward in the axial direction is formed on the outside, and the rotating shaft is formed around a substantially disc-shaped draining plate inserted above the annular rib, and a through hole passing through the rotating shaft outside the center. A substantially cylindrical waterproof cover fitted to the outer periphery of the annular rib. The waterproof cover is elastically waterproof and made of rubber or the like, and is provided with a projection on the inner surface of the waterproof cover, which is fitted with the annular rib, over the entire circumference to be compressed and held. Further, a flange is formed on the entire periphery at the lower end of the outer peripheral portion of the drainage plate so as to cover the tip of the annular rib. A drain port is formed at the lower end of the cylindrical portion of the waterproof cover. If necessary, a drain groove is formed inside the cylindrical portion at a position communicating with the drain port.

[0005]

According to the above construction, an annular bearing holding portion for holding a bearing for supporting a rotating shaft passing through the bracket is provided inside a bracket attached to the stator, and an annular bearing holding portion is provided outside the bracket. An annular rib protruding in the axial direction is formed, and the rotating shaft has a substantially disc-shaped drainage plate inserted through an upper portion of the annular rib, and a through-hole centered on the outside thereof, the through-hole passing through the rotating shaft. A substantially bottomed cylindrical waterproof cover fitted to the outer periphery of the rib is provided, and a flange is formed at a lower end of the outer peripheral portion of the drainage plate to cover a tip of the annular rib. Since the water drain groove is formed inside the cylindrical portion of the waterproof cover and the water drain hole is formed at the lower end thereof, the waterproofness of the bearing can be improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an electric motor will be described below with reference to the drawings. The same reference numerals are used for the same parts as in the conventional example. FIG. 1 is a half sectional view of an electric motor according to the present invention, and FIG. 2 is an enlarged partial sectional view of a main part in FIG. The bracket 1 has a stator 2 and a rotor 3 built therein. A rotating shaft 4 fixed to the rotor 3 is provided inside the bracket 1 with a bearing 5 for supporting the rotating shaft 4 penetrating the bracket. It is rotatably supported. The bracket 1 has an annular bearing holding portion 6 for holding a bearing and an annular rib 7 protruding outward in the axial direction. And the rotating shaft 4
Above the annular rib 7, a substantially disc-shaped draining plate 8 inserted around the rotary shaft 4 and a through hole 9 passing through the rotary shaft outside thereof are provided. A substantially bottomed cylindrical waterproof cover 10 fitted to the outer periphery is provided.
The waterproof cover has a U-shaped rubber-made elastic waterproof cover surrounding the outer end surface of the annular rib, and is fitted therein. By forming the protrusions 11 over the entire surface of the surface, the protrusions are held and fixed in a compressed state, so that it is possible to further prevent water from entering.

Further, since the outer periphery of the draining plate 8 is formed so as to cover the tip of the annular rib, water does not enter from the inner periphery of the annular rib, so that the bearing does not flood. Further, if a flange 12 is formed at the lower end of the outer periphery of the draining plate to cover the tip of the annular rib 7, the effect is further doubled. A drain groove 13 for guiding water is provided inside the cylindrical portion of the waterproof cover, and water is drained so that water can be drained even when the shaft of the motor is installed in a vertical or horizontal direction at the lower end corner. A hole 14 is formed. With the above configuration, water that has entered along the rotating shaft is drained from the drain port without going to the bearing.

Next, another embodiment of the present invention will be described with reference to the drawings. The same reference numerals are used for the same parts as in the conventional example. FIG. 3 is a half sectional view of an electric motor according to another embodiment of the present invention, and FIG. 4 is an enlarged half sectional view of a main part in FIG. In this embodiment, a cylindrical elastic body 15 is inserted around the outer periphery of the annular rib instead of forming a projection on the waterproof cover to secure waterproofness as in the above-described embodiment. At the time of insertion, the inner surface of the elastic body is coated with an adhesive and fixed to the outer periphery of the bearing holding portion 6. Next, the inside diameter of the waterproof cover 10 is
5 Water-proof cover 10 formed by pressing a steel plate having no protrusion so as to fit with this elastic body so as to fit with this elastic body.
Is compressed so that the waterproof cover is held and inserted until it comes into contact with the end face of the bracket, so that the axial position is fixed. Then, the elastic body is compressed by the waterproof cover, and the surface resistance is increased, so that the waterproof cover can be held. At the same time, the waterproof property is assured, and further water infiltration can be prevented.

[0009]

As described above, according to the present invention, an annular bearing holding portion for holding a bearing for supporting a rotating shaft passing through the bracket is provided inside the bracket attached to the stator, and an annular bearing holding portion is provided outside the bracket. Form an annular rib protruding in the axial direction,
A substantially disk-shaped draining plate inserted into the upper part of the annular rib on the rotating shaft, and a substantially bottomed bottom fitted around the outer periphery of the annular rib having a centered through hole passing through the rotating shaft on the outside thereof. A tubular waterproof cover is provided, a flange is formed at a lower end of an outer peripheral portion of the draining plate to cover a tip of the annular rib, and water is drained inside the tubular portion of the waterproof cover. A groove is formed at the lower end of the drainage opening. As a result, it is possible to provide a motor with improved waterproofness and improved reliability.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an electric motor showing one embodiment of the present invention.

FIG. 2 is an enlarged half sectional view of a main part in FIG. 1 of the present invention.

FIG. 3 is a half sectional view of an electric motor showing another embodiment of the present invention.

FIG. 4 is an enlarged half sectional view of a main part in FIG. 3 of the present invention.

FIG. 5 is a half sectional view of a conventional electric motor.

FIG. 6 is an enlarged half sectional view of a main part in FIG. 5 of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket 2 Stator 3 Rotor 4 Rotary shaft 5 Bearing 6 Bearing holding part 7 Annular rib 8 Drain plate 9 Through hole 10 Waterproof cover 11 Projection part 12 Flange 13 Drain groove 14 Drain port 15 Elastic body

Claims (5)

[Claims] 1. A stator and a rotor are built in a bracket,
The rotation axis fixed to this rotor is inside the bracket,
In an electric motor rotatably supported by a pair of bearings that rotatably support a rotating shaft that passes through the bracket, an annular rib that protrudes in the axial direction is formed outside an annular bearing holding portion that holds the bearing, A substantially disk-shaped draining plate inserted into the upper part of the annular rib on the rotating shaft, and a substantially bottomed bottom fitted around the outer periphery of the annular rib having a centered through hole passing through the rotating shaft on the outside thereof. A bearing waterproofing device for an electric motor, comprising a tubular waterproof cover. 2. The waterproof cover has a configuration in which an elastic waterproof cover having a U-shaped cross section surrounding the outer end surface of the annular rib is fitted and mounted. 2. The waterproof bearing device for an electric motor according to claim 1, wherein a projection is formed over the entire circumference. 3. The bearing waterproofing device for an electric motor according to claim 2, wherein a drain port is formed at a lower end of the cylindrical portion of the waterproof cover. 4. The bearing waterproofing device for an electric motor according to claim 3, wherein a flange is formed at a lower end of an outer peripheral portion of the drain plate to cover a tip of the annular rib. 5. A waterproof cover is inserted into an outer periphery of said annular rib so as to fit with said elastic body.
5. The waterproof bearing device for an electric motor according to claim 1, further comprising: