WO2019072050A1

WO2019072050A1 - Dual-bearing structure for motor having dual-lubrication system

Info

Publication number: WO2019072050A1
Application number: PCT/CN2018/103859
Authority: WO
Inventors: 邓方林; 王建良; 龙英睿; 李进泽; 车三宏; 龚天明; 谭亮; 陈国旗; 于亮; 杨晔; 仇超武
Original assignee: 江苏中车电机有限公司
Priority date: 2017-10-13
Filing date: 2018-09-03
Publication date: 2019-04-18
Also published as: CN107508410A

Abstract

A dual-bearing structure for a motor having a dual-lubrication system. An inner bearing (7), a grease regulator (5) and an outer bearing (3) are sleeved on a rotation shaft (10); the grease regulator is located between the inner bearing and the outer bearing; an outer bearing chamber (4) is sleeved on the outer bearing; an inner bearing chamber (6) is sleeved on the inner bearing; the end parts of the inner bearing and the inner bearing chamber are provided with an inner bearing cover (8); an inner oil seal (9) is provided between the inner bearing cover and the rotation shaft; the end parts of the outer bearing and the outer bearing chamber are provided with an outer bearing cover (2); an outer oil seal (1) is provided between the outer bearing cover and the rotation shaft; the inner bearing chamber, the inner bearing cover, the inner oil seal and the inner bearing form an inner grease storage cavity; an inner grease injection channel (122) is provided inside the inner bearing chamber; the outer bearing chamber, the outer bearing cover, the outer oil seal and the outer bearing form an outer grease storage cavity; an outer grease injection channel (121) is provided inside the outer bearing chamber; the inner bearing chamber, the inner bearing and the grease regulator form an inner grease discharging cavity; the outer bearing chamber, the outer bearing and the grease regulator form an outer grease discharging cavity; grease discharging holes (13) are provided at the lateral bottom of the outer bearing chamber and are respectively in communication with the inner grease discharging cavity and the outer grease discharging cavity.

Description

Double bearing structure for motor with double lubrication system

Technical field

The invention belongs to the field of electric machines, and more particularly relates to a double bearing structure for a motor with a dual lubrication system.

Background technique

One end adopts "deep groove ball bearing + cylindrical roller bearing", and the other end adopts the structure of cylindrical roller bearing, which is a common bearing arrangement in the motor field. Cylindrical roller bearings are used to withstand radial loads, while deep groove ball bearings are used to withstand axial loads. For the double bearing combination of such "deep groove ball bearing + cylindrical roller bearing", the installation and fixing structure and the lubrication method have an important influence on the performance life of the bearing.

The traditional method is to directly match the two bearings to each other. As a single bearing, a single bearing assembly structure and lubrication method are used. For example, oil is injected from the side of one bearing, and waste oil is discharged from the side of the other bearing. The traditional method has certain drawbacks: First, it will cause the inner bearing to block due to the outer bearing, so that the grease will accumulate on the inner side and affect the heat dissipation; secondly, the outer bearing will always need to use the inner bearing to lubricate the "used" grease. The lubrication is poor; the third is that the two bearings are in contact with each other, which is not conducive to heat dissipation of the bearings, and is not conducive to the discharge of waste oil

Patented a double-bearing lubricating device for electric motor and motor (application number: 201120478641.X) proposes to separate the bearing with a retaining ring, filling the space separated from the middle of the double bearing, and discharging the waste grease from the outside of the two bearings. The way, there is a certain improvement compared to the traditional method. However, there are still certain defects: First, the two bearings share a grease storage chamber, and it is impossible to independently control the amount of fatliquoring; second, the waste oil passage of the inner bearing has a complicated twist, which is not conducive to the discharge of waste oil.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dual bearing structure for a motor with a dual lubrication system that is relatively easy to discharge waste oil.

According to an aspect of the present invention, a dual bearing structure for a motor with a dual lubrication system is provided, including a rotating shaft, an inner bearing chamber, an outer bearing chamber, an inner bearing, an outer bearing, an inner bearing cap, an inner oil seal, and an outer bearing cap. , external oil seal, grease regulator and waste oil box,

The inner shaft bearing, the grease regulator and the outer bearing are sleeved on the rotating shaft, the grease regulator is located between the inner bearing and the outer bearing, and the outer bearing chamber is sleeved in the In the outer bearing, the inner bearing chamber is sleeved on the inner bearing, and the inner bearing and the inner bearing chamber are provided with an inner bearing cover at an end thereof, and the inner bearing cover is disposed between the inner bearing cover and the rotating shaft An inner oil seal is provided, and an outer bearing cover is disposed at an end of the outer bearing and the outer bearing chamber, and an outer oil seal is disposed between the outer bearing cover and the rotating shaft,

The inner bearing chamber, the inner bearing cover, the inner oil seal and the inner bearing constitute an inner grease storage chamber, and the outer bearing chamber is provided with an inner grease passage for connecting the outside and the inner grease chamber. The outer bearing chamber, the outer bearing cover, the outer oil seal and the outer bearing constitute an outer grease reservoir, and the outer bearing chamber is provided with an outer grease passage for connecting the outside and the inner grease chamber.

The inner bearing chamber, the inner bearing and the grease regulator constitute an inner grease chamber, and the outer bearing chamber, the outer bearing and the grease regulator constitute an outer grease chamber, and the outer bearing chamber The side bottom portion is provided with a grease discharge hole for communicating with the waste oil tank, and the grease discharge hole is respectively communicated with the inner grease discharge chamber and the outer grease discharge chamber.

In the invention, the grease is injected into the inner grease chamber and the outer grease chamber from the inner grease passage of the inner bearing chamber and the outer grease passage of the outer bearing chamber, and the grease is squeezed after lubricating the inner bearing and the outer bearing. They are collected into the inner and outer grease chambers. Some of these greases continue to lubricate the inner and outer bearings, and the other part acts as a “waste oil” under the centrifugal force generated by the rotation of the grease regulator. It is taken out to the drain hole at the bottom of the outer bearing chamber and finally collected into the waste oil tank. The inner bearing lubrication system and the outer bearing lubrication system of the invention are independent, and the inner bearing and the outer bearing can be filled with unequal amounts of grease according to actual needs without mutual interference; the waste oil is discharged between the inner bearing and the outer bearing, The waste oil discharge passage can be shared, which simplifies the waste oil discharge path and is beneficial to the discharge of waste oil; the inner bearing and the outer bearing are separated by the grease regulator, which is beneficial to the heat dissipation of the bearing and reduces the working temperature rise of the bearing.

In some embodiments, the fat-discharging aperture is a flared shape that is narrower and wider than the upper. Therefore, the discharged grease is prevented from accumulating in the fat-discharging hole, which is more advantageous for the waste oil to be collected into the waste oil tank through the grease-removing hole.

In some embodiments, the outer bearing is in a clearance fit with the outer bearing chamber. This is used to withstand axial loads.

In some embodiments, the inner bearing and the inner bearing chamber are in a transitional fit. This is used to withstand radial loads.

In some embodiments, the sides of the grease regulator are slanted. It is convenient for the waste grease in the inner grease chamber and the outer grease chamber to be discharged.

In some embodiments, the waste oil tank is made of plastic. Low cost and instantly replaceable.

In some embodiments, the waste oil cartridge includes an associated cartridge and a lid, the lid being provided with a buckle that is snapped onto the outer bearing chamber. When you need to clean the waste oil, you can directly remove the buckle of the Panasonic lid, remove the box, and then put on a new box, which is easy and convenient to operate.

In some embodiments, the outer bearing is a deep groove ball bearing and the inner bearing is a cylindrical roller bearing. The use of deep groove ball bearings as outer bearings can reduce friction components and increase the speed; the use of cylindrical roller bearings as internal bearings can prevent the roller from tilting or friction between the rollers, effectively preventing the increase of the rotational torque; Work efficiency.

In some embodiments, the outer bearing is a cylindrical roller bearing and the inner bearing is a deep groove ball bearing. The use of cylindrical roller bearings as outer bearings prevents the inclination of the rollers or the friction between the rollers, effectively preventing the increase of the rotational torque; the use of deep groove ball bearings as internal bearings can reduce the friction components and increase the speed; Work efficiency.

DRAWINGS

1 is a schematic structural view of a lubricating device for a dual bearing of a motor according to Embodiment 1 of the present invention;

Fig. 2 is a structural schematic view showing a lubricating device for a double bearing of a motor according to a second embodiment of the present invention.

Detailed ways

Example 1

1 is a double bearing structure for a motor with a dual lubrication system according to an embodiment of the present invention. As shown in FIG. 1, the double bearing structure for the motor with dual lubrication system includes a rotating shaft 10, an inner bearing chamber 6, an outer bearing chamber 4, an inner bearing 7, an outer bearing 3, an inner bearing cover 8, an inner oil seal 9, and an outer casing. Bearing cap 2, outer oil seal 1, grease regulator 5 and waste oil tank 11.

In this embodiment, the outer bearing 3 is a deep groove ball bearing and the inner bearing 7 is a cylindrical roller bearing. In other embodiments, the outer bearing 3 is a cylindrical roller bearing and the inner bearing 7 is a deep groove ball bearing. The inner shaft 7, the grease regulator 5 and the outer bearing 3 are sleeved on the rotating shaft 10. The grease regulator 5 is located between the inner bearing 7 and the outer bearing 3. The two sides of the grease regulator 5 are inclined to facilitate the discharge of waste grease in the inner grease chamber and the outer grease chamber. The outer bearing chamber 4 is sleeved on the outer bearing 3. The outer bearing 3 is in clearance fit with the outer bearing chamber 4, thereby being used to withstand axial loads. The inner bearing chamber 6 is sleeved on the inner bearing 7, and the inner bearing 7 and the inner bearing chamber 6 are in a transitional fit. This is used to withstand radial loads. The inner bearing 7 and the inner bearing chamber 6 are provided with an inner bearing cover 8 at the end. An inner oil seal 9 is provided between the inner bearing cap 8 and the rotating shaft 10. An outer bearing cap 2 is provided at an end of the outer bearing 3 and the outer bearing chamber 4. An outer oil seal 1 is provided between the outer bearing cap 2 and the rotating shaft 10. The inner bearing chamber 6, the inner bearing cap 8, the inner oil seal 9 and the inner bearing 7 constitute an inner grease reservoir. The inner bearing chamber 6 is provided with an inner grease passage 121 for communicating the outside and the inner grease chamber. The outer bearing chamber 4, the outer bearing cap 2, the outer oil seal 1 and the outer bearing 3 constitute an outer grease reservoir. The outer bearing chamber 4 is provided with an outer grease passage 122 for connecting the outer and outer grease chambers. The inner bearing chamber 6, the inner bearing 7, and the grease regulator 5 constitute an inner grease chamber. The outer bearing chamber 4, the outer bearing 3 and the grease regulator 5 constitute an outer grease chamber. The side bottom of the outer bearing chamber 4 is provided with a grease discharge hole 13 communicating with the waste oil tank 11, and the grease discharge hole 13 communicates with the inner grease discharge chamber through the first communication hole, and the grease discharge hole 13 passes through the second communication hole and the outer grease discharge. The cavity is connected. The grease discharge hole 13 has a trumpet shape with a narrow upper and a lower width. Thereby, the discharged grease is prevented from accumulating in the grease discharge hole 13, and it is more advantageous that the waste oil is collected into the waste oil tank 11 through the grease discharge hole 13. The material of the waste oil tank 11 is plastic. Low cost and instantly replaceable. The waste oil tank 11 includes a connected casing and a cover, and the cover is provided with a buckle which is buckled on the outer bearing chamber 4. When you need to clean the waste oil, you can directly remove the buckle of the Panasonic lid, remove the box, and then put on a new box, which is easy and convenient to operate.

In the present invention, the grease is injected from the inner grease passage 121 of the inner bearing chamber 6 and the outer grease passage 122 of the outer bearing chamber 4 into the inner grease chamber and the outer grease chamber, respectively, and the grease is lubricated in the inner bearing 7 and After the outer bearing 3 is extruded, it is collected into the inner grease chamber and the outer grease chamber. Some of these greases continue to lubricate the inner bearing 7 and the outer bearing 3, and the other portion acts as a "waste oil" in the grease adjustment. Under the action of the centrifugal force generated by the rotation of the device 5, it is taken out to the drain hole 13 at the bottom of the outer bearing chamber 4 and finally collected into the waste oil tank 11. The lubrication system of the inner bearing 7 of the present invention and the lubrication system of the outer bearing 3 are independent, and the inner bearing 7 and the outer bearing 3 can be filled with unequal amounts of grease according to actual needs without mutual interference; waste oil from the inner bearing 7 and outside The discharge between the bearings 3 can share the waste oil discharge passage, simplifying the waste oil discharge path and facilitating the discharge of the waste oil; the inner bearing 7 and the outer bearing 3 are separated by the grease regulator 5, which is beneficial to the bearing heat dissipation and reduces the bearing. Work temperature rises.

Example 2

As shown in Fig. 2, on the basis of the first embodiment, the outer bearing chamber 4 and the inner bearing chamber 6 of the split structure in the first embodiment are combined into a single unit structure as the bearing chamber 14.

What has been described above is only some embodiments of the invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention.

Claims

A double bearing structure for a motor with a dual lubrication system, comprising: a rotating shaft, an inner bearing chamber, an outer bearing chamber, an inner bearing, an outer bearing, an inner bearing cap, an inner oil seal, an outer bearing cap, an outer oil seal, and a grease Regulator and waste oil box,

The inner shaft bearing, the grease regulator and the outer bearing are sleeved on the rotating shaft, the grease regulator is located between the inner bearing and the outer bearing, and the outer bearing chamber is sleeved in the In the outer bearing, the inner bearing chamber is sleeved on the inner bearing, and the inner bearing and the inner bearing chamber are provided with an inner bearing cover at an end thereof, and the inner bearing cover is disposed between the inner bearing cover and the rotating shaft An inner oil seal is provided, and an outer bearing cover is disposed at an end of the outer bearing and the outer bearing chamber, and an outer oil seal is disposed between the outer bearing cover and the rotating shaft,

The inner bearing chamber, the inner bearing cover, the inner oil seal and the inner bearing constitute an inner grease storage chamber, and the outer bearing chamber is provided with an inner grease passage for connecting the outside and the inner grease chamber. The outer bearing chamber, the outer bearing cover, the outer oil seal and the outer bearing constitute an outer grease reservoir, and the outer bearing chamber is provided with an outer grease passage for connecting the outside and the inner grease chamber.

The inner bearing chamber, the inner bearing and the grease regulator constitute an inner grease chamber, and the outer bearing chamber, the outer bearing and the grease regulator constitute an outer grease chamber, and the outer bearing chamber The side bottom portion is provided with a grease discharge hole for communicating with the waste oil tank, and the grease discharge hole is respectively communicated with the inner grease discharge chamber and the outer grease discharge chamber.
The dual bearing structure for a motor with a dual lubrication system according to claim 1, wherein the grease discharge hole has a flare shape that is narrower and narrower.
A dual bearing structure for a motor with a dual lubrication system according to claim 1, wherein said outer bearing is in clearance fit with said outer bearing chamber.
The dual bearing structure for a motor with a dual lubrication system according to claim 1, wherein the inner bearing and the inner bearing chamber are in a transitional fit.
The dual bearing structure for a motor with a dual lubrication system according to claim 1, wherein both sides of the grease regulator are inclined.
The dual bearing structure for a motor with a dual lubrication system according to claim 1, wherein the waste oil tank is made of plastic.
The dual bearing structure for a motor with a dual lubrication system according to claim 6, wherein the waste oil tank comprises a connected casing and a cover, the cover is provided with a buckle, and the cover is buckled On the outer bearing chamber.
The dual bearing structure for a motor with a dual lubrication system according to claim 1, wherein the outer bearing is a deep groove ball bearing and the inner bearing is a cylindrical roller bearing.
The dual bearing structure for a motor with a dual lubrication system according to claim 1, wherein the outer bearing is a cylindrical roller bearing and the inner bearing is a deep groove ball bearing.