CN114718959B

CN114718959B - Rolling bearing lubricating device and method

Info

Publication number: CN114718959B
Application number: CN202210225593.6A
Authority: CN
Inventors: 王琳; 王勇; 高天; 苏华
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 2022-03-07
Filing date: 2022-03-07
Publication date: 2023-10-20
Anticipated expiration: 2042-03-07
Also published as: CN114718959A

Abstract

The invention discloses a rolling bearing lubrication device and a method, wherein a rotating shaft is provided with an oil supply channel, an inner ring or an outer ring of the rolling bearing is provided with an axial oil supply channel and a radial oil supply channel, lubricating oil is used for lubricating the rolling bearing under the radial ring through the oil supply channel on the rotating shaft and the radial oil supply channel on the rolling bearing, the oil supply channel on the rotating shaft is used for supplying oil for the radial shaft sleeve, the relative rotation between the rotating shaft and the radial shaft sleeve enables the pressure of the lubricating oil in a gap to be increased, and the pressure increasing lubricating oil flowing out from the end part of the radial shaft sleeve is divided into two or three directions to respectively carry out jet lubrication and axial ring under lubrication on the rolling body and the inner ring and the outer ring of the rolling bearing, so that the axial ring under lubrication, the radial ring under lubrication and the jet lubrication of the rolling bearing are realized. The invention does not introduce an additional oil supply lubricating device, reduces the weight of the device, saves the installation space, and improves the utilization efficiency and the cooling effect of lubrication.

Description

Rolling bearing lubricating device and method

Technical Field

The invention belongs to the field of bearing lubrication, and particularly relates to a rolling bearing lubrication device and a rolling bearing lubrication method.

Background

The rolling bearing lubrication method applied to the aero-engine or the gas turbine mainly comprises the following steps: jet lubrication, under-ring lubrication, jet lubrication, etc. In the practical use process, the common oil supply mode is jet lubrication and under-ring lubrication due to the limitation of space and lubrication effect.

The jet lubrication is to align the nozzle with the radial clearance between the inner diameter or outer diameter surface of the cage and the ring of the rolling bearing, supply oil to the inner cavity of the bearing at a certain jet speed, and lubricate and cool the bearing. Jet lubrication is required to overcome the eddy currents caused by rotation of the rotating ring, the retainer and the rolling bodies to enter the bearing cavity, so that higher oil supply pressure is required. The oil supply pressure needs to be increased with the increase of DN value of the rolling bearing, and the performance of the external oil supply device is highly required. When in spray lubrication, the lubricating oil is sprayed onto the inner ring and the outer ring, so that the lubricating oil is necessarily sputtered, and cannot enter the bearing completely, and the lubrication efficiency is reduced. The jet lubrication is not beneficial to lubrication and cooling of the bearing inner ring although the structure is simple.

The lubrication under the ring means that the lubricating oil is sprayed out from a nozzle, collected by an oil collecting sleeve and thrown into the inner cavity of the bearing through the radial Kong Yikao centrifugal force on the inner ring of the bearing. Because the lubricating oil is thrown into the inner cavity of the bearing by centrifugal force under the ring, the lubricating oil entering the oil collecting sleeve can completely enter the inner cavity of the bearing as long as the rotating speed of the bearing is not lower than a certain value.

Compared with jet lubrication, the under-ring lubrication has high oil supply efficiency, is favorable for lubrication and cooling of a high-speed bearing, but has a complex structure and needs a rich space in a bearing cavity. In addition, in the starting process, the centrifugal force is insufficient to throw the lubricating oil in the lubricating oil channel into the roller path because of the lower rotating speed of the bearing, so that the lubricating and cooling effects of the under-ring lubrication on the bearing are poor under the working conditions of starting and lower rotating speed.

The independent under-ring lubrication and jet lubrication have respective disadvantages and cannot effectively meet the lubrication requirements of the rolling bearing under certain working conditions. Due to the limitation of the installation space of the rolling bearing, the difficulty of simultaneously realizing the lubrication under the ring and the jet lubrication is high by installing an additional device.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a rolling bearing lubrication device and a rolling bearing lubrication method, so as to realize under-ring lubrication and jet lubrication at the same time.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

a rolling bearing lubricating device comprises an oil supply channel, a rotating shaft, a radial shaft sleeve gap, a radial shaft sleeve, a chamfer end face, an axial gap, a rolling bearing, an axial oil supply channel and a radial oil supply channel;

the radial shaft sleeve and the rolling bearing are coaxially arranged on the rotating shaft, the radial shaft sleeve is provided with a chamfer end face, an axial gap is reserved between the radial shaft sleeve and the rolling bearing, the rolling bearing is axially and circumferentially fixed, and at least one axial oil supply duct and at least one radial oil supply duct are simultaneously arranged on an inner ring or an outer ring of the rolling bearing, or at least one axial oil supply duct and at least one radial oil supply duct are simultaneously arranged on an inner ring and an outer ring of the rolling bearing.

Furthermore, the rolling bearing is axially and circumferentially fixed through the shaft shoulder of the rotating shaft and the mounting hole of the bearing seat.

Further, the radial shaft sleeve and the rolling bearing are axially fixed through a bearing seat with a fixing hole and a shaft shoulder on the rotating shaft.

Further, the radial shaft sleeve is axially and circumferentially fixed through the fixing hole of the bearing seat.

Further, the outer ring of the rolling bearing, the radial shaft sleeve and the bearing seat are in interference fit or transition fit, and the inner ring of the rolling bearing and the rotating shaft are in interference fit or transition fit.

Further, an axial oil supply duct arranged on the inner ring or the outer ring of the rolling bearing is parallel to the rotating shaft or has a certain included angle with the rotating shaft.

Further, a radial oil supply duct arranged on the inner ring or the outer ring of the rolling bearing is perpendicular to the rotating shaft or has a certain included angle with the rotating shaft.

Further, the rolling bearing may be a ball bearing, a roller bearing or a needle bearing.

Further, the chamfer angle of the chamfer end face is 0-90 degrees.

A method of lubricating a rolling bearing comprising the steps of:

step one: oil is supplied to the radial shaft sleeve through an oil supply channel of the rotating shaft, and the rotating shaft and the radial shaft sleeve relatively rotate, so that the lubricating oil rotates in a radial shaft sleeve gap in a following way, and the pressure of the lubricating oil in the radial shaft sleeve gap is increased;

step two: the lubricating oil with increased pressure flows out of the radial shaft sleeve gap, wherein a part of the lubricating oil flows along the surface of the rotating shaft and enters the rolling bearing cavity through the axial oil supply channel of the rolling bearing for lubrication; part of lubricating oil is directly thrown to the rolling bodies of the rolling bearing to directly lubricate the outer surface of the inner ring and the inner surface of the outer ring of the rolling bearing; the other part of lubricating oil flows along the chamfer end surface and flows into the axial gap;

step three: the lubricating oil in the axial gap is gradually increased, so that the lubricating oil enters the gap between the inner ring and the outer ring of the rolling bearing and on the rolling bodies to lubricate the rolling bearing.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a rolling bearing lubrication device and a method, which can realize that at least one axial oil supply duct and at least one radial oil supply duct on a rolling bearing lubricate the rolling bearing at the same time, and the pressure lubricating oil discharged from the radial shaft sleeve end lubricates the rolling bearing in a spraying way; part of the pressure-increased lubricating oil flowing out of the end part of the radial shaft sleeve can flow into the rolling bearing along an axial oil supply passage of the rolling bearing to axially lubricate the rolling body and the inner ring and the outer ring of the rolling bearing; the lubricating oil is used for lubricating the rolling bearing under the radial ring through an oil supply channel on the rotating shaft and a radial oil supply channel on the rolling bearing. In addition, no extra device is introduced to fix the rolling bearing, so that the space of the device is saved, the overall quality is reduced, the axial ring lower lubrication, the radial ring lower lubrication and the jet lubrication of the rolling bearing are realized, and the utilization efficiency and the cooling effect of lubricating oil are improved.

Drawings

For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of oil supply of a 45-degree chamfer end face and an axial oil supply channel and a radial oil supply channel of a ball bearing inner ring simultaneously.

Fig. 2 is a schematic diagram of oil supply of the 45-degree chamfer end face and the axial oil supply channel and the radial oil supply channel of the ball bearing outer ring simultaneously.

Fig. 3 is a schematic diagram of the 45 ° chamfer end face and the roller/needle bearing inner race axial oil supply passage and radial oil supply passage of the present invention simultaneously supplying oil.

Fig. 4 is a schematic diagram of the 45 ° chamfer end face and the roller/needle bearing outer ring axial oil supply passage and radial oil supply passage of the present invention simultaneously supplying oil.

Fig. 5 is a schematic diagram of simultaneous oil supply of a 10 ° chamfer end face and axial oil supply channels and radial oil supply channels of an inner ring of a ball bearing according to the present invention.

Fig. 6 is a schematic diagram of the simultaneous oil supply of the 75 ° chamfer end face and the axial oil supply passage and the radial oil supply passage of the ball bearing inner ring according to the present invention.

Fig. 7 is a schematic diagram of the 45 ° chamfer end face and the axial oil supply channel and radial oil supply channel of the ball bearing inner and outer rings of the present invention.

Wherein: 101-oil supply channels, 102-rotating shafts, 103-lubricating oil, 104-radial sleeve gaps, 105-radial sleeves, 106-bearing seats, 107-45-degree chamfer end faces, 108-axial gaps, 109-ball bearings, 110-axial oil supply channels, 111-radial oil supply channels, 309-roller/needle bearings, 507-10-degree chamfer end faces and 607-75-degree chamfer end faces.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The invention is described in further detail below with reference to the attached drawing figures:

example 1:

referring to fig. 1, the invention provides a rolling bearing lubrication device, which comprises an oil supply channel 101, a rotating shaft 102, lubricating oil 103, a radial sleeve clearance 104, a radial sleeve 105, a bearing seat 106, a 45-degree chamfer end surface 107, an axial clearance 108, a ball bearing 109, an axial oil supply channel 110 and a radial oil supply channel 111. The radial shaft sleeve 105 and the ball bearing 109 are coaxially arranged on the rotating shaft 102, the inner ring of the ball bearing 109 is in interference fit or transition fit with the rotating shaft 102, and the ball bearing 109 is axially and circumferentially fixed through the shaft shoulder of the rotating shaft 102 and the mounting hole of the bearing seat 106; the radial shaft sleeve 105 and the ball bearing 109 are fixed through a bearing seat 106 with a fixing hole and a shaft shoulder on the rotating shaft 102, the fixing mode is interference fit or transition fit, and the radial shaft sleeve 105 is axially fixed through the fixing hole of the bearing seat 106. A radial sleeve gap 104 exists between the radial sleeve 105 and the rotating shaft 102, and the lubricating oil 103 supplies oil to the radial sleeve 105 through the oil supply channel 101 of the rotating shaft 102, so that a pressure oil film is formed in the radial sleeve gap 104.

The radial shaft sleeve 105 is provided with a 45-degree chamfer end face 107, and after pressure oil flows out from the radial shaft sleeve gap 104, the pressure oil can be divided into three parts: a portion of the lubricating oil 103 flows directly along the surface of the rotating shaft 102, i.e., the flow path 1-a; a portion of the lubricating oil 103 is thrown directly along the 45 ° chamfer end face 107 surface, i.e., flow path 1-b; another portion of the lubricating oil 103 flows 107 along the 45 deg. chamfer end face, i.e., flow path 1-c.

Part of the lubricating oil 103 flowing out of the radial sleeve clearance 104 is thrown directly onto the rolling bodies of the ball bearing 109 along the flow path 1-b, namely, the flow path 1-b, under the action of centrifugal force, so that the outer surface of the inner ring and the inner surface of the outer ring of the ball bearing 109 are directly lubricated; a part of the lubricating oil 103 flowing out of the radial sleeve clearance 104 flows along the surface of the rotating shaft 102, namely along the flow path 1-a, and finally enters the bearing cavity through the axial oil supply channel 110 of the ball bearing 109 for lubrication; another portion of the lubricating oil 103 will flow along the 45 deg. chamfer end face 107 of the radial bushing 104, i.e. flow path 1-c, which portion of the lubricating oil 103 will be stored in the axial gap 108. Since a portion of the lubricating oil 103 is stored in the axial gap 108, this portion of the lubricating oil 103 will be thrown into the bearing cavity due to the rotation of the inner ring of the ball bearing 109, lubricating the ball bearing 109.

The rolling bearing lubrication method can realize the aim of simultaneously carrying out jet lubrication and under-ring lubrication on the rolling bearing and the radial shaft sleeve by a single oil supply channel, and does not introduce an additional bearing fixing device, thereby simplifying the lubrication structure of the rolling bearing, reducing the weight and improving the lubricating oil efficiency.

Example 2:

as shown in fig. 2, unlike embodiment 1, an axial oil supply passage 110 is opened on the outer ring of the ball bearing 109.

There are two flow paths for the pressurized oil exiting the radial sleeve gap 104: firstly, the pressure oil directly flies out along the 45-degree chamfer end face 107 of the radial shaft sleeve 105, namely, the flow path 2-a, and the part of lubricating oil 103 directly enters the bearing cavity of the ball bearing 109 to lubricate the ball bearing 109; secondly, the pressure oil flows along the 45 ° chamfer end surface 107 of the radial sleeve 105, i.e. the flow path 2-b, and this portion of the pressure oil will be stored in the axial gap 108, and then the lubricating oil 103 in the axial gap 108 lubricates the ball bearing 109 along the axial oil supply passage 110 on the outer ring of the ball bearing 109.

Example 3:

as shown in fig. 3, unlike embodiment 1, the rolling bearing is a roller/needle bearing 309.

Example 4:

as shown in fig. 4, unlike embodiment 3, an axial oil supply passage 110 is opened on the outer race of the roller/needle bearing 309.

Example 5:

as shown in fig. 5, the angle of the chamfered end surface is 10 ° unlike embodiment 1.

The radial shaft sleeve 105 is provided with a 10-degree chamfer end surface 507, and after pressure oil flows out from the radial shaft sleeve gap 104, the pressure oil can be divided into three parts: a portion of the lubricating oil 103 flows directly along the surface of the rotating shaft 102, i.e., the flow path 5-a; a portion of the lubricating oil 103 is thrown directly along the 10 deg. chamfer end surface 507 surface, i.e., flow path 5-b; another portion of the lubricating oil 103 flows along the 10 deg. chamfer end surface 507, i.e., flow path 5-c.

A portion of the lubricating oil 103 flowing out of the radial sleeve clearance 104 is thrown directly onto the inner ring of the ball bearing 109 by centrifugal force, and this portion of the lubricating oil is stored in the axial clearance 108, i.e., the flow path 5-b; a part of the lubricating oil 103 flowing out of the radial sleeve clearance 104 flows along the surface of the rotating shaft 102, namely along the flow path 5-a, and finally enters the bearing cavity through the axial oil supply channel 110 of the ball bearing 109 for lubrication; another portion of the lubricating oil 103 will flow along the 10 deg. chamfered end surface 507 of the radial bushing 104, i.e. the flow path 5-c, which portion of the lubricating oil 103 will be stored in the axial gap 108. When the external oil supply is interrupted or insufficient, a part of the lubricating oil 103 is stored in the axial gap 108, and this part of the lubricating oil 103 is thrown into the bearing cavity due to the rotation of the inner ring of the ball bearing 109, so as to lubricate the ball bearing 109, and the lubricating oil 103 stored in the radial oil supply passage 111 is thrown into the bearing cavity, so as to lubricate the ball bearing 109.

Example 6:

as shown in fig. 6, unlike example 5, the angle of the chamfer end face was 75 °.

The radial shaft sleeve 105 is provided with a 75-degree chamfer end face 607, and after pressure oil flows out from the radial shaft sleeve gap 104, the pressure oil can be divided into three parts: a portion of the lubricating oil 103 flows directly along the surface of the rotating shaft 102, i.e., the flow path 6-a; a portion of the lubricating oil 103 is thrown directly along the surface of the 75 ° chamfer end face 607, namely a flow path 6-b; another portion of the lubricating oil 103 flows along the 75 deg. chamfer end face 607, i.e., flow path 6-c.

A portion of the lubricating oil 103 flowing out of the radial sleeve clearance 104 is thrown directly into the axial clearance 108 along the flow path 6-b, i.e., the flow path 6-b, by centrifugal force; a part of the lubricating oil 103 flowing out of the radial sleeve clearance 104 flows along the surface of the rotating shaft 102, namely along the flow path 6-a, and finally enters the bearing cavity through the axial oil supply channel 110 of the ball bearing 109 for lubrication; another portion of the lubricating oil 103 will flow along the 75 deg. chamfered end face 607 of the radial sleeve 104, i.e. the flow path 6-c, which portion of the lubricating oil 103 will be stored in the axial gap 108. When the external oil supply is interrupted or insufficient, a part of the lubricating oil 103 is stored in the axial gap 108, and this part of the lubricating oil 103 is thrown into the bearing cavity due to the rotation of the inner ring of the ball bearing 109, so as to lubricate the ball bearing 109, and the lubricating oil 103 stored in the radial oil supply passage 111 is thrown into the bearing cavity, so as to lubricate the ball bearing 109.

Example 7:

as shown in fig. 7, unlike embodiment 1, an axial oil supply passage 110 and a radial oil supply passage 111 are simultaneously arranged on the inner and outer races of the ball bearing 109.

Part of the lubricating oil 103 flowing out of the radial sleeve clearance 104 is thrown directly onto the rolling bodies of the ball bearing 109 along the flow path 7-b, namely, the flow path 7-b, under the action of centrifugal force, so that the outer surface of the inner ring and the inner surface of the outer ring of the ball bearing 109 are directly lubricated; a part of the lubricating oil 103 flowing out of the radial sleeve clearance 104 flows along the surface of the rotating shaft 102, namely along the flow path 7-a, and finally enters the bearing cavity through the axial oil supply channel 110 of the ball bearing 109 for lubrication; another part of the lubricating oil 103 will flow along the 45 ° chamfered end surface 107 of the radial sleeve 104, i.e. the flow path 7-c, which is divided into two parts, the first part of the lubricating oil 103 will be stored in the axial gap 108, and another part of the lubricating oil 103 enters the bearing cavity along the axial oil supply channel 110 for lubrication; when the external oil supply is interrupted or insufficient, a part of the lubricating oil 103 is stored in the axial gap 108, and this part of the lubricating oil 103 is thrown into the bearing cavity due to the rotation of the inner ring of the ball bearing 109, so as to lubricate the ball bearing 109, and the lubricating oil 103 stored in the radial oil supply passage 111 is thrown into the bearing cavity, so as to lubricate the ball bearing 109.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The rolling bearing lubricating device is characterized by comprising an oil supply channel (101), a rotating shaft (102), a radial shaft sleeve gap (104), a radial shaft sleeve (105), a chamfer end surface, an axial gap (108), a rolling bearing, an axial oil supply oil channel (110) and a radial oil supply oil channel (111);

the radial shaft sleeve (105) and the rolling bearing are coaxially arranged on the rotating shaft (102), the radial shaft sleeve (105) is provided with a chamfer end face, an axial gap (108) is reserved between the radial shaft sleeve (105) and the rolling bearing, the rolling bearing is axially and circumferentially fixed, and at least one axial oil supply oil duct (110) and at least one radial oil supply oil duct (111) are simultaneously arranged on an inner ring or an outer ring of the rolling bearing, or at least one axial oil supply oil duct (110) and at least one radial oil supply duct (111) are simultaneously arranged on the inner ring and the outer ring of the rolling bearing;

the oil supply channel (101) supplies oil for the radial shaft sleeve (105), the lubricating oil (103) flows into the axial gap (108) from the radial shaft sleeve gap (104), and the lubricating oil (103) flowing along the axial direction or the inclined direction in the axial gap (108) passes through the axial oil supply channel (110) to axially lubricate the rolling bodies and the inner ring and the outer ring of the rolling bearing.

2. A rolling bearing lubrication device according to claim 1, characterized in that the rolling bearing is fixed axially and circumferentially by means of a shoulder of the rotating shaft (102) and a mounting hole of the bearing housing (106).

3. A rolling bearing lubrication device according to claim 1, characterized in that the radial sleeve (105) and the rolling bearing are axially fixed by means of a bearing seat (106) with a fixing hole and a shoulder on the rotating shaft (102).

4. A rolling bearing lubrication device according to claim 1, characterized in that the radial bushing (105) is fixed axially and circumferentially by means of a fixation hole of the bearing housing (106).

5. A rolling bearing lubrication device according to claim 1, characterized in that the outer ring and the radial sleeve (105) of the rolling bearing are in an interference fit or a transition fit with the bearing housing (106), and the inner ring of the rolling bearing is in an interference fit or a transition fit with the rotating shaft (102).

6. A rolling bearing lubrication device according to claim 1, characterized in that the axial oil supply channel (110) of the rolling bearing, which is provided on the inner ring or the outer ring, is parallel to or at an angle to the rotating shaft (102).

7. A rolling bearing lubrication device according to claim 1, characterized in that the radial oil supply channel (111) of the rolling bearing, which is provided on the inner ring or the outer ring, is perpendicular to the rotating shaft (102) or has a certain angle.

8. A rolling bearing lubrication device according to claim 1, characterized in that the rolling bearing is a ball bearing, a roller bearing or a needle bearing.

9. A rolling bearing lubrication device according to claim 1, wherein the chamfer angle of the chamfer end face is 0 ° to 90 °.

10. A method of lubricating a rolling bearing based on the device of any one of claims 1 to 9, comprising the steps of:

step one: oil is supplied to the radial shaft sleeve (105) through an oil supply channel (101) of the rotating shaft (102), the rotating shaft (102) and the radial shaft sleeve (105) rotate relatively, so that the lubricating oil (103) rotates in a radial shaft sleeve gap (104) in a follow mode, and the pressure of the lubricating oil (103) in the radial shaft sleeve gap (104) is increased;

step two: the lubricating oil (103) with increased pressure flows out of the radial shaft sleeve gap (104), wherein a part of the lubricating oil (103) flows along the surface of the rotating shaft (102) and enters the rolling bearing cavity through the axial oil supply channel (110) of the rolling bearing for lubrication; a part of lubricating oil (103) is directly thrown onto the rolling bodies of the rolling bearing to directly lubricate the outer surface of the inner ring and the inner surface of the outer ring of the rolling bearing; another part of the lubricating oil (103) flows along the chamfer end face and flows into the axial gap (108);

step three: the lubricating oil (103) in the axial gap (108) gradually increases, so that the lubricating oil (103) enters the gap between the inner ring and the outer ring of the rolling bearing and the rolling body to lubricate the rolling bearing.