CN118066214A - Grease lubricated bearing for aviation motor - Google Patents

Abstract

The invention discloses an aviation motor grease lubricated bearing, which belongs to the technical field of bearings, and comprises: a bearing outer ring, a bearing inner ring, a bearing retainer, a bearing sealing system and a bearing rolling element; the bearing outer ring and the bearing inner ring are made of high-temperature bearing steel S8Cr4Mo4V smelted by double vacuum, the bearing retainer material grade is alloy steel 40CrNiMoA, the surface is silver-plated, a turning and grinding composite process is adopted, the sealing method is a non-contact lip seal, and the grease has no leakage when running in vacuum and at high speed. The bearing sealing system is a skeleton oil seal, and the grease uses polyalphaolefin synthetic oil with excellent performance as a base oil, and a thickener uses a composite polyurea base with a temperature resistance of more than 260°C; the bearing inner diameter is 16-18mm, and can withstand a combined heavy load of 1500N in the radial direction and 750N in the axial direction, a wide temperature range of -55-200°C, and a rotation speed of 19800rpm.

Description

Grease lubricated bearing for aviation motor

Technical Field

The invention relates to the technical field of bearings, in particular to an aviation motor grease lubricated bearing.

Background technique

During use, aviation motors may fail due to foreign matter entering the interior, insulation damage, medium contamination, corrosion, and mechanical aging. The service life of existing domestic aviation motor bearings is generally low, generally 3 times the calculated life, and the reliability is only 90%. With the increase of service time, the accuracy loss is relatively serious, and the bearing temperature resistance level is not high (≤120℃), the corrosion resistance of the rings, rolling elements and cages is poor, the sealing performance is poor, and the grease in the bearing is easy to leak and volatilize.

Summary of the invention

The present invention aims to provide an aviation motor grease lubricated bearing. In order to solve the problems existing in the prior art, the present invention adopts the following technical solution.

An aviation motor grease lubricated bearing comprises: a bearing outer ring, a bearing inner ring, a bearing retainer, a bearing sealing system and a bearing rolling element; the bearing outer ring and the bearing inner ring are made of high-temperature bearing steel S8Cr4Mo4V smelted by double vacuum; the bearing retainer is made of alloy steel 40CrNiMoA, the surface of which is silver-plated, and the design adopts a turning and grinding composite process; the sealing method of the bearing sealing system is a non-contact lip seal, and the grease does not leak when the vacuum and high-speed operation are in progress; the bearing sealing system is a skeleton oil seal, and the sealing ring of the bearing sealing system is made of fluorosilicone mixed rubber; the grease uses polyalphaolefin synthetic oil with excellent performance as the base oil, and the thickener uses a composite polyurea base with a temperature resistance of more than 260°C; the bearing inner diameter is 16-18mm, and can withstand a combined heavy load of 1500N in the radial direction and 750N in the axial direction, a wide temperature range of -55-200°C, and a rotation speed of 19800rpm.

Preferably, the bearing retainer includes a pocket and a connecting channel, the pocket is elliptical, the major axis of the elliptical pocket is consistent with the circumferential direction of the bearing retainer, and through holes are provided at both ends of the major axis of the pocket, and the two through holes are respectively connected to the connecting channels on the left and right sides of the pocket; the connecting channel has a circular or elliptical loop structure in the middle, that is, the middle is circular or elliptical, and there are two channels on both sides; the connecting channel is inside the bearing retainer, that is, the connecting channel and the loop structure cannot be seen from the inside and outside of the bearing retainer; there is an oil storage ring in the middle of the pocket.

Preferably, the bearing retainer includes a pocket and a connecting channel, the pocket is circular, and the circular pocket has through holes at both ends of the diameter consistent with the circumferential direction of the bearing retainer, and the two through holes are respectively connected to the connecting channels on the left and right sides of the pocket; the connecting channel has a circular or elliptical loop structure in the middle, that is, the middle is circular or elliptical, and there are two channels on both sides; the connecting channel is inside the bearing retainer, that is, the connecting channel and the loop structure cannot be seen from the inside and outside of the retainer; there is an oil storage ring in the middle of the pocket.

Preferably, the connecting channel passes through from the outer surface to the inner surface of the bearing retainer.

Preferably, the bearing retainer further comprises upper and lower channels, which are located at the upper and lower sides of the pockets and are connected to the pockets and the loops through auxiliary channels; the upper and lower channels and the auxiliary channels are located inside the retainer.

Preferably, the upper and lower channels and the auxiliary channel pass through from the outer surface to the inner surface of the retaining frame.

Preferably, the grinding accuracy level of the turning and grinding composite process is 0.001mm, and the turning accuracy level is 0.01mm.

Preferably, the dynamic unbalance of the bearing retainer is controlled within 0.8g*cm.

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

1. The bearing outer ring and the bearing inner ring are made of double vacuum smelted high-temperature bearing steel S8Cr4Mo4V. Compared with the electroslag remelted high-temperature steel Cr4Mo4V, this material has low oxygen content, low harmful element content, good carbide uniformity, and high fatigue reliability.

2. The bearing cage is made of alloy steel 40CrNiMoA with silver plating on the surface. This material has high mechanical strength at high temperature, low density, and similar thermal expansion coefficient to the bearing outer ring and inner ring materials. The lathe-grinding composite processing technology is adopted, and the grinding precision level is 0.001mm, and the lathe precision level is 0.01mm. The dynamic unbalance of the bearing cage is controlled within 0.8g*cm (at a speed of 2400r/min).

3. The bearing of the present invention has a long service life (not less than 10 years), which is more than 8 times the calculated service life, a reliability of more than 98%, and basically no loss of accuracy.

4. The grease used in this bearing can form a complete lubricating oil film under high temperature conditions, has good load-bearing capacity and lubrication ability, and the storage period can reach 5 years.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a general structural diagram of an aviation motor grease-lubricated bearing according to Embodiment 1 of the present invention;

FIG2 is a structural diagram of a cage of an aviation motor grease-lubricated bearing according to Embodiment 2 of the present invention;

FIG3 is a structural diagram of a cage of an aviation motor grease-lubricated bearing according to Embodiment 3 of the present invention;

FIG. 4 is a structural diagram of a retainer for a grease-lubricated bearing of an aviation motor as described in Example 6 of the present invention.

Explanation of reference numerals: 01 - bearing outer ring; 02 - bearing inner ring; 04 - bearing rolling element; 09 - bearing retainer; 68 - bearing sealing system; 91 - pocket; 92 - connecting channel; 93 - oil storage ring; 94 - through hole.

Detailed ways

In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

Example 1

As shown in FIG. 1 , the aviation motor grease-lubricated bearing provided in this embodiment includes: a bearing outer ring 01 , a bearing inner ring 02 , a bearing retainer 09 , a bearing sealing system 68 and a bearing rolling element 04 .

The bearing outer ring 01 and the bearing inner ring 02 are made of high-temperature bearing steel S8Cr4Mo4V smelted by double vacuum. The bearing cage 09 is made of alloy steel 40CrNiMoA with silver plating on the surface. The design adopts a turning and grinding composite process. The grinding accuracy level of the turning and grinding composite process is 0.001mm, the turning accuracy level is 0.01mm, and the dynamic imbalance of the bearing cage is controlled within 0.8g*cm. The sealing method of the bearing sealing system 68 is a non-contact lip seal. When the bearing is in vacuum and running at high speed, there is no leakage of grease. The bearing sealing system is a skeleton oil seal, and the sealing ring of the bearing sealing system is made of fluorosilicone compound rubber. The grease uses polyalphaolefin synthetic oil with excellent performance as the base oil, and the thickener uses a composite polyurea base, which has a high temperature resistance of more than 260℃.

The aviation motor grease-lubricated bearing has an inner diameter of 17 mm and can withstand a combined heavy load of 1500 N in the radial direction and 750 N in the axial direction, a wide temperature range of -55 to 200°C, and a rotation speed of 19,800 rpm.

Example 2

As shown in FIG2 , the difference between Example 2 and Example 1 is that a new type of retainer structure is provided. In Example 2, retainer 09 includes an elliptical pocket 91 and a connecting channel 92. The long axis of the elliptical pocket 91 is consistent with the circumferential direction of the retainer. There are through holes 94 at both ends of the long axis of the elliptical pocket 91. The two through holes 9 are respectively connected to the connecting channels 92 on the left and right sides of the pocket 91. The connecting channel 92 has a circular or elliptical loop structure in the middle, that is, the middle is circular or elliptical, and there are two channels on both sides. The connecting channel 92 is inside the retainer, that is, the connecting channel 92 and the loop structure cannot be seen from the inside and outside of the retainer 09; there is an oil storage ring 93 in the middle of the pocket.

The pocket 91 is elliptical so that the two sides do not contact the bearing rolling element 04, which can reduce frictional heat generation and further store a certain amount of grease. The connecting channel 92 stores a certain amount of grease, which can be supplied to the pocket 91 through the through hole 94. Since the through hole 94 is located at the long axis end of the pocket 91, the bearing rolling element 04 does not hinder the grease from flowing out of the through hole; the oil storage ring 93 in the middle of the pocket can reduce friction on the one hand, and store a certain amount of grease on the other hand. The connecting channel 92 has a circular or elliptical loop structure in the middle. In addition to storing more grease, the loop structure is also conducive to the supply of grease to the pocket 91 through the through holes 94 on both sides, and is conducive to maintaining the pressure balance of the grease in the left and right channels.

Example 3

As shown in FIG. 3 , the third embodiment differs from the second embodiment in that the pocket 91 is circular.

Example 4

The difference between Example 4 and Example 2 is that the connecting channel passes through from the outer surface to the inner surface of the retaining frame.

Example 5

The difference between Example 5 and Example 3 is that the connecting channel passes through from the outer surface to the inner surface of the retaining frame.

Example 6

Embodiment 6 adds upper and lower channels on the basis of Embodiments 2-5, as shown in FIG4 , the upper and lower channels are located on the upper and lower sides of the pocket 91 and are connected to the pocket 91 and the loop through the auxiliary channel. The upper and lower channels and the auxiliary channel are both located inside the retainer 09.

Example 7

The difference between Example 7 and Example 6 is that the upper and lower channels and the auxiliary channel pass through from the outer surface to the inner surface of the retaining frame.

Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (10)

1. An aviation motor grease lubricated bearing, characterized in that it comprises: a bearing outer ring, a bearing inner ring, a bearing retainer, a bearing sealing system and a bearing rolling element; the bearing outer ring and the bearing inner ring are made of high-temperature bearing steel S8Cr4Mo4V smelted by double vacuum; the bearing retainer material grade is alloy steel 40CrNiMoA, the surface is silver-plated, and a turning and grinding composite process is adopted; the sealing method of the bearing sealing system is a non-contact lip seal, and when running at high speed in vacuum, there is no leakage of grease, the bearing sealing system is a skeleton oil seal, and the sealing ring of the bearing sealing system is made of fluorosilicone compound rubber; the grease uses polyalphaolefin synthetic oil as the base oil, and the thickener uses a composite polyurea base, and the temperature resistance of the grease is above 260°C; the inner diameter of the bearing is 16-18mm, and it can withstand a combined heavy load of 1500N in the radial direction and 750N in the axial direction, as well as a wide temperature range of -55~200°C and a rotation speed of 19800rpm. 2. An aviation motor grease-lubricated bearing as described in claim 1, characterized in that the bearing retainer includes a pocket and a connecting channel, the pocket is elliptical, the major axis of the elliptical pocket is consistent with the circumferential direction of the bearing retainer, and through holes are provided at both ends of the major axis of the elliptical pocket, and the two through holes are respectively connected to the connecting channels on the left and right sides of the pocket; the connecting channel has a circular or elliptical loop structure in the middle, that is, the middle is circular or elliptical, and there are two channels on both sides; the connecting channel is inside the bearing retainer; an oil storage ring is provided in the middle of the pocket. 3. An aviation motor grease-lubricated bearing as described in claim 1, characterized in that the bearing retainer includes a pocket and a connecting channel, the pocket is circular, and the circular pocket has through holes at both ends of the diameter consistent with the circumferential direction of the bearing retainer, and the two through holes are respectively connected to the connecting channels on the left and right sides of the pocket; the connecting channel has a circular or elliptical loop structure in the middle, that is, the middle is circular or elliptical, and there are two channels on both sides; the connecting channel is inside the bearing retainer, and an oil storage ring is provided in the middle of the pocket. 4. An aviation motor grease-lubricated bearing as described in claim 2, characterized in that the connecting channel passes through from the outer surface to the inner surface of the bearing retainer. 5. An aviation motor grease-lubricated bearing as described in claim 3, characterized in that the connecting channel passes through from the outer surface to the inner surface of the bearing retainer. 6. An aviation motor grease-lubricated bearing as described in any one of claims 2-5, characterized in that it also includes upper and lower channels, which are located on the upper and lower sides of the pockets and are connected to the pockets and the loop structure through auxiliary channels. 7. An aviation motor grease-lubricated bearing as described in claim 6, characterized in that the upper and lower channels and the auxiliary channel are all located inside the bearing retainer. 8. An aviation motor grease-lubricated bearing as described in claim 6, characterized in that the upper and lower channels and the auxiliary channel pass through from the outer surface to the inner surface of the bearing retainer. 9. An aviation motor grease-lubricated bearing as described in claim 1, characterized in that the grinding accuracy level of the turning-grinding composite process is 0.001 mm, and the turning accuracy level is 0.01 mm. 10. An aviation motor grease-lubricated bearing as claimed in claim 1, characterized in that the dynamic unbalance of the bearing retainer is controlled within 0.8 g*cm.