CN203434783U

CN203434783U - Bearing structure capable of eliminating shaft current

Info

Publication number: CN203434783U
Application number: CN201320558848.7U
Authority: CN
Inventors: 刘小东
Original assignee: Zhongda Motors Co Ltd
Current assignee: Zhongda Motors Co Ltd
Priority date: 2013-09-09
Filing date: 2013-09-09
Publication date: 2014-02-12
Anticipated expiration: 2023-09-09

Abstract

The utility model relates to a bearing structure capable of eliminating shaft current. A bearing is mounted on a motor shaft; an inner bearing cover is mounted on the motor shaft inside the bearing, an outer bearing cover is mounted outside the bearing, an end cap is sleeved on the outer ring of the bearing, and the inner bearing cover, the end cap and the outer bearing cover are fastened and integrated via bolts; an circlip is mounted on the motor shaft outside the bearing; an oil flinger is mounted on the motor shaft between the circlip and the bearing; a first insulating pad is arranged between the outer end surface of the outer ring of the bearing and the inner end surface of the outer bearing cover, and a second insulating pad is arranged between the inner end surface of the outer ring of the bearing and the outer end surface of the inner bearing cover; and a bearing sleeve is arranged between the outer ring of the bearing and the inner circle of the end cap. The bearing structure is simple, compact and reasonable in structure, enables that a loop cannot be formed between a rotor and the end cap, effectively eliminates shaft current to a motor generated by a frequency converter, avoids bearing damage, and thus, protects the motor.

Description

Can eliminate the bearing arrangement of shaft current

Technical field

The utility model relates to a kind of motor bearings structure, the especially a kind of bearing arrangement that can eliminate shaft current.

Background technology

Nowadays low-carbon environment-friendly awareness of saving energy is more and more denseer, and frequency converter uses more and more extensive at machine field.The use of frequency converter can make motor start under low frequency and low-voltage, has overcome the impact to line voltage when heavy-duty motor starts; Frequency converter also can make motor long-time running under low frequency and low-voltage, thereby has reduced energy consumption.Yet frequency converter is owing to can producing a lot of harmonic waves in use procedure, and particularly a little high order odd harmonics can produce induced current (being commonly referred to shaft current) to the loop being formed by support, bearing and rotor.Shaft current can puncture the oil film between bearing and produce electric discharge, will make in the course of time the oil of lubricating grease deteriorated gradually, when serious, can make bearing burn out, and causes parking accident.Eliminate shaft current, existing method adopts insulation bearing mostly, but because insulation bearing is expensive, the manufacturing cycle is long, so that motor product does not have the competitiveness of price.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, thereby provide a kind of, can effectively eliminate the bearing arrangement that can eliminate shaft current of shaft current so that form to open circuit between bearing and end cap.

The technical scheme providing according to the utility model, the described bearing arrangement that can eliminate shaft current, bearing is installed on motor shaft, on the motor shaft of bearing inner side, internal bearing cover is installed, in bearing outside, bearing end cover is installed, in the outer ring of bearing, cylindrical outer cover is connected to end cap, internal bearing cover, end cap and bearing end cover are by bolted one, on the motor shaft in bearing outside, circlip is installed, on the motor shaft between circlip and bearing, disc is installed, the inner ring outer face of the inner face of disc and bearing offsets, the outer face of disc and the inner face of circlip offset, between the outer face, outer ring of bearing and the inner face of bearing end cover, be provided with the first insulation cushion, between the outer ring of bearing inner face and the outer face of internal bearing cover, be provided with the second insulation cushion, between the outer ring of bearing cylindrical and the inner circle of end cap, be provided with bearing holder (housing, cover).

The wall thickness of described insulating case is 0.2 ~ 0.35mm.

The wall thickness of described bearing holder (housing, cover) is 4 ~ 8mm.

The thickness of described the first insulation cushion is 1.0 ~ 1.5mm.

The thickness of described the second insulation cushion is 1.0 ~ 1.5mm.

The utility model is simple, compact and reasonable for structure; The utility model makes not become loop between rotor and end cap, has effectively eliminated frequency converter motor is produced to shaft current, has avoided bearing damage, thus protection motor; The utility model is not only with low cost, successful, but also reduced later maintenance cost.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Embodiment

Below in conjunction with specific embodiment, the utility model is described in further detail.

This can eliminate the bearing arrangement of shaft current, bearing 8 is installed on motor shaft, internal bearing cover 6 is installed on the motor shaft of bearing 8 inner sides, in bearing 8 outsides, bearing end cover 5 is installed, in the outer ring of bearing 8, cylindrical outer cover is connected to end cap 1, internal bearing cover 6, end cap 1 passes through bolted one with bearing end cover 5, circlip 9 is installed on the motor shaft in bearing 8 outsides, on the motor shaft between circlip 9 and bearing 8, disc 10 is installed, the inner ring outer face of the inner face of disc 10 and bearing 8 offsets, the inner face of the outer face of disc 10 and circlip 9 offsets, between the outer face, outer ring of bearing 8 and the inner face of bearing end cover 5, be provided with the first insulation cushion 4, between the outer ring of bearing 8 inner face and the outer face of internal bearing cover 6, be provided with the second insulation cushion 7, between the outer ring of bearing 8 cylindrical and the inner circle of end cap 1, be provided with bearing holder (housing, cover) 3.

The wall thickness of described insulating case 2 is 0.2 ~ 0.35mm.

The wall thickness of described bearing holder (housing, cover) 3 is 4 ~ 8mm.

The thickness of described the first insulation cushion 4 is 1.0 ~ 1.5mm.

The thickness of described the second insulation cushion 7 is 1.0 ~ 1.5mm.

During manufacture, first end cap 1 is heated to certain temperature, insulating material is rolled on bearing holder (housing, cover) 3 uniformly, form insulating case 2, bearing holder (housing, cover) 3 is installed in the bearing chamber of end cap 1 to gap filling fluid sealant between bearing holder (housing, cover) 3 and bearing chamber, again end cap 1 integral body is carried out to fine finishining, the complete car of seam that bearing holder (housing, cover) 3 is coordinated with end cap 1 falls, and like this, between bearing holder (housing, cover) 3 and end cap 1, has formed insulation.

Between internal bearing cover 6 and bearing 8, put a slice the second insulation cushion 7, the outer face of the inner face of the second insulation cushion 7 and internal bearing cover 6 offsets, the outer ring inner face of the outer face of the second insulation cushion 7 and bearing 8 offsets, between bearing end cover 5 and bearing 8, also put a slice the first insulation cushion 4, the outer face, outer ring of the inner face of the first insulation cushion 4 and bearing 8 offsets, the inner face of the outer face of the first insulation cushion 4 and bearing end cover 5 offsets, like this, bearing 8 has all been spaced with extraneous conductor, thereby reach support, end cap 1, bearing 8, between rotor, form the object opening circuit, eliminated up hill and dale shaft current.

Claims

1. the bearing arrangement that can eliminate shaft current, bearing (8) is installed on motor shaft, on the motor shaft of bearing (8) inner side, internal bearing cover (6) is installed, in bearing (8) outside, bearing end cover (5) is installed, in the outer ring of bearing (8), cylindrical outer cover is connected to end cap (1), internal bearing cover (6), end cap (1) passes through bolted one with bearing end cover (5), on the motor shaft in bearing (8) outside, circlip (9) is installed, on the motor shaft between circlip (9) and bearing (8), disc (10) is installed, the inner ring outer face of the inner face of disc (10) and bearing (8) offsets, the inner face of the outer face of disc (10) and circlip (9) offsets, it is characterized in that: between the outer face, outer ring of bearing (8) and the inner face of bearing end cover (5), be provided with the first insulation cushion (4), between the outer ring inner face of bearing (8) and the outer face of internal bearing cover (6), be provided with the second insulation cushion (7), between the outer ring cylindrical of bearing (8) and the inner circle of end cap (1), be provided with bearing holder (housing, cover) (3).

2. the bearing arrangement that can eliminate shaft current as claimed in claim 1, is characterized in that: the wall thickness of described insulating case (2) is 0.2 ~ 0.35mm.

3. the bearing arrangement that can eliminate shaft current as claimed in claim 1, is characterized in that: the wall thickness of described bearing holder (housing, cover) (3) is 4 ~ 8mm.

4. the bearing arrangement that can eliminate shaft current as claimed in claim 1, is characterized in that: the thickness of described the first insulation cushion (4) is 1.0 ~ 1.5mm.

5. the bearing arrangement that can eliminate shaft current as claimed in claim 1, is characterized in that: the thickness of described the second insulation cushion (7) is 1.0 ~ 1.5mm.