CN214063290U - Oil lubrication structure - Google Patents

Abstract

The utility model relates to an oil lubrication structure, relate to the field of blast apparatus, which comprises a housin, axis of rotation and end cover, the axis of rotation is rotated along the axle center of self and is connected on the casing, the axis of rotation cover is equipped with the bearing, the bearing groove has been seted up on the casing, the bearing joint is in the bearing groove, end cover fixed connection is on the casing, form lubricating oil chamber between end cover and the casing, still be provided with in the axis of rotation and get rid of the oil piece, it sets up at the lubricating oil intracavity to get rid of the oil piece, lubricating oil chamber and bearing groove intercommunication, be provided with on the casing and be used for blockking the sealing mechanism that lubricating oil leaked, sealing mechanism includes resistant oil retainer ring, resistant oil retainer ring sets up the one end of keeping away from the end cover at the bearing, resistant oil retainer ring and the inner peripheral surface butt of casing. According to the oil-resistant check ring, when the rotating shaft rotates, lubricating oil is not prone to passing through the oil-resistant check ring, the probability that the lubricating oil is far away from one end of the lubricating oil cavity from the bearing and leaks is reduced, and the utilization rate of the lubricating oil is improved.

Description

Oil lubrication structure

Technical Field

The application relates to the field of air blowing equipment, in particular to an oil lubricating structure.

Background

The Roots blower is a positive displacement blower and is a rotary compressor with two vane-shaped rotors moving relatively in cylinder to compress and convey gas. The blower has simple structure and convenient manufacture, is widely applied to aquaculture oxygenation, sewage treatment aeration and cement conveying, is suitable for a gas conveying and pressurizing system in a low-pressure occasion, and can also be used as a vacuum pump.

Referring to fig. 1 and 2, most conventional roots blowers include a housing 110, a driving rotor 120, a driven rotor 130, a front cover 140, and a rear cover 150. The driving rotor 120 includes a driving shaft 121 and a driving blade 122, and the driving blade 122 is coaxially sleeved on the driving shaft 121; the driven rotor 130 includes a driven shaft 131 and driven blades 132, and the driven blades 132 are coaxially sleeved on the driven shaft 131.

Referring to fig. 1 and 2, the housing 110 is hollow, the driving rotor 120 and the driven rotor 130 are rotatably connected to the housing 110 along their axes, and the driving vane 122 and the driven vane 132 are disposed in the housing 110. After the driving rotor 120 and the driven rotor 130 are installed, the axis of the driving rotor 120 is parallel to the axis of the driven rotor 130.

Referring to fig. 1 and 2, two axial ends of the driving rotating shaft 121 are an input end and an output end, respectively, the input end of the driving rotating shaft 121 is in transmission connection with a power source, and the power source drives the driving rotating shaft 121 to rotate. One end of the driven rotating shaft 131 close to the output end of the driving rotating shaft 121 is an input end, the other end of the driven rotating shaft is a driven end, the output end of the driving rotating shaft 121 is coaxially and fixedly connected with an output gear 180, the input end of the driven rotating shaft 131 is coaxially and fixedly connected with an input gear 170, and the output gear 180 is the same in tooth number as the input gear 170 and is meshed with the input gear. An oil slinger 190 is arranged on the input end of the driving rotating shaft 121 and/or the driven end of the driven rotating shaft 131.

Referring to fig. 1 and 2, the front end cap 140 is disposed at an end close to the input end of the driving shaft 121, and the front end cap 140 is fixedly connected to the housing 110; the rear cover 150 is disposed at an end close to the output end of the active rotating shaft 121, and the rear cover 150 is fixedly connected to the housing 110. Both ends of the driving rotating shaft 121 in the axial direction and both ends of the driven rotating shaft 131 in the axial direction are provided with bearings 160, a first oil tank 410 is formed between the rear end cover 150 and the housing 110, and the input gear 170, the output gear 180, the bearing 160 arranged at the output end of the driving rotating shaft 121 and the bearing 160 arranged at the input end of the driven rotating shaft 131 are all arranged in the first oil tank 410. A second oil tank 420 is formed between the front end cap 140 and the housing 110, and the oil slinger 190, the bearing 160 on the input end of the driving rotating shaft 121, and the bearing 160 on the driven end of the driven rotating shaft 131 are disposed in the second oil tank 420.

Referring to fig. 1 and 2, the first and second oil tanks 410 and 420 contain lubricating oil, and when the driving rotor 120 rotates, the input gear 170 and the output gear 180 throw the lubricating oil onto the bearings 160 provided in the first oil tank 410, thereby lubricating the bearings 160 in the first oil tank 410. Oil slinger 190 in second oil tank 420 slings the lubricating oil to bearing 160 provided in second oil tank 420, thereby lubricating bearing 160 in second oil tank 420.

In view of the above-mentioned related art, the inventors believe that, after the lubricating oil is thrown into the bearing, the lubricating oil is liable to leak from the end of the bearing close to the rotor, and the utilization rate of the lubricating oil is reduced.

SUMMERY OF THE UTILITY MODEL

In order to improve the utilization ratio of lubricating oil, this application provides an oil lubrication structure.

The application provides an oil lubrication structure adopts following technical scheme:

the utility model provides an oil lubrication structure, includes casing, axis of rotation and end cover, the axis of rotation is rotated along the axle center of self and is connected on the casing, the axis of rotation cover is equipped with the bearing, the bearing groove has been seted up on the casing, the bearing joint is in the bearing inslot, end cover fixed connection is in on the casing, the end cover with form lubricating oil chamber between the casing, still be provided with in the axis of rotation and get rid of the oil spare, it sets up to get rid of the oil spare lubricating oil intracavity, lubricating oil chamber with the bearing groove intercommunication, be provided with the resistant oil retainer ring that is used for blockking lubricating oil leakage on the casing, resistant oil retainer ring sets up the bearing is kept away from the one end of end cover, resistant oil retainer ring with the inner peripheral surface butt of casing.

By adopting the technical scheme, when the rotating shaft rotates, the rotating shaft of the oil-proof retainer ring cylinder rotates together, and lubricating oil in the lubricating oil cavity passes through the bearing and then is blocked by the oil-proof retainer ring, so that the lubricating oil is difficult to pass through the oil-proof retainer ring, the probability of leakage of the lubricating oil from one end, far away from the lubricating oil cavity, of the bearing is reduced, and the utilization rate of the lubricating oil is improved.

Optionally, the oil slinger is a gear or an oil slinger, and the gear or the oil slinger is coaxially and fixedly connected to the rotating shaft.

Through adopting above-mentioned technical scheme, when the axis of rotation rotated, gear or oil thrower can get rid of the lubricating oil in the lubricating oil chamber, make lubricating oil sputter to the bearing on, and then realize the lubrication of bearing.

Optionally, the outer circumferential surface of the oil-resistant retainer ring is in clearance fit with the inner circumferential surface of the housing.

By adopting the technical scheme, when the rotating shaft rotates, the oil-proof check ring can rotate along with the rotating shaft at the same time, and the outer peripheral surface of the oil-proof check ring is in clearance fit with the inner peripheral surface of the shell, so that friction is not easy to occur between the outer peripheral surface of the oil-proof check ring and the shell, the abrasion rate of the oil-proof check ring is reduced, the service life of the oil-proof check ring is prolonged, and the maintenance frequency of maintenance personnel for maintaining the oil-proof check ring is reduced.

Optionally, a retainer ring groove for placing the oil-resistant retainer ring is formed in the housing, and the axial length of the retainer ring groove is greater than the thickness of the oil-resistant retainer ring.

Through adopting above-mentioned technical scheme, when the axis of rotation was established to the resistant oil retaining ring cover, resistant oil retaining ring still can wear to establish in the retainer ring groove, because the ascending length in retainer ring groove axial is greater than resistant oil retaining ring's thickness for resistant oil retaining ring is difficult to take place to contradict with the outer lane of bearing, and then has reduced the speed of resistant oil retaining ring wearing and tearing, has improved resistant oil retaining ring's life-span, has reduced the frequency that maintainer maintained resistant oil retaining ring.

Optionally, an oil unloading groove is further formed in the inner wall of the bearing groove, the oil unloading groove is formed in the bottom end line of the bearing groove, and the oil unloading groove is communicated with the lubricating oil cavity.

Through adopting above-mentioned technical scheme, lubricating oil remains behind resistant oil retainer ring and bearing after passing the bearing, and the lubricating oil of here can flow back to the lubricating oil cavity through the oil discharge groove in, has reduced the probability of lubricating oil from resistant oil retainer ring and bearing between the long-pending, has reduced the probability that lubricating oil leaked from resistant oil retainer ring, has improved the utilization ratio of lubricating oil.

Optionally, an inner diameter of the retainer groove is smaller than an inner diameter of the bearing groove.

By adopting the technical scheme, after the lubricating oil flows into the retainer ring groove through the bearing, the lubricating oil can be accumulated between the oil-resistant retainer ring and the bearing under the action of the oil-resistant retainer ring, and the lubricating oil can flow into the bearing again to lubricate the bearing because the inner diameter of the retainer ring groove is smaller than that of the bearing groove; meanwhile, lubricating oil at the oil-resistant retainer ring can conveniently flow into the bearing groove and then flow into the lubricating oil cavity, so that the utilization rate of the lubricating oil is improved.

Optionally, a positioning sleeve is coaxially sleeved on the rotating shaft, one end of the positioning sleeve is abutted to the inner ring of the bearing, and the oil-resistant check ring is sleeved on the positioning sleeve.

By adopting the technical scheme, the positioning sleeve is abutted against the inner ring of the bearing, so that the bearing is not easy to slide towards the oil-resistant retainer ring along the axial direction of the bearing when rotating, and the probability of abrasion of the oil-resistant retainer ring is reduced.

Optionally, the positioning sleeve is further provided with a wind resistance groove, and the wind resistance groove is formed in one end, far away from the bearing, of the positioning sleeve.

Through adopting above-mentioned technical scheme, the air in the roots blower can flow earlier to the choke groove when leaking in, and the pressure differential between choke groove and the atmosphere is less than the pressure differential between the roots blower inside and the atmosphere, and then has reduced the speed of leaking out in the roots blower, has improved roots blower's pressurize effect.

Optionally, the casing is provided with heat dissipation holes for dissipating heat, the heat dissipation holes are formed in one side, away from the lubricating oil cavity, of the retainer ring groove, one ends of the heat dissipation holes are communicated with the atmosphere, and the other ends of the heat dissipation holes are communicated with the inside of the casing.

Through adopting above-mentioned technical scheme, when the axis of rotation rotated, the bearing was heated gradually, and partial heat is absorbed by the lubricating oil in bearing and the lubricating oil chamber, and partial heat is via the casing transmission to the atmosphere in, and partial heat is via the axis of rotation to in transmitting to the atmosphere through the louvre, improved the radiating efficiency of bearing, reduced the overheated probability of bearing.

Optionally, the heat dissipation hole is formed in the lower portion of the housing.

Through adopting above-mentioned technical scheme, outside impurity is difficult for diffusing to the axis of rotation through the louvre, and then makes impurity be difficult for diffusing to the bearing in through the axis of rotation, has protected the bearing, has prolonged the life-span of bearing.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the setting of resistant oil retainer ring, make the lubricating oil that passes the bearing be difficult for passing resistant oil retainer ring again, reduced lubricating oil from the bearing and kept away from the probability that lubricating oil pocket one end leaked, practiced thrift lubricating oil, improved the utilization ratio of lubricating oil.

2. Through the arrangement of the retainer ring groove, the oil-resistant retainer ring is not easy to rub with the shell or the bearing, the abrasion rate of the oil-resistant retainer ring is reduced, the service life of the oil-resistant retainer ring is prolonged, and the frequency of maintenance personnel for maintaining the oil-resistant retainer ring is reduced.

3. Through the setting of unloading the oil groove, reduced lubricating oil from resistant oil retainer ring and bearing between the probability of long-pending, and then reduced lubricating oil from resistant oil retainer ring department probability of leaking, be convenient for simultaneously during lubricating oil flows into the bearing groove, later lubricating oil rethread unloads the oil groove and flow back to in the lubricating oil cavity, improved the utilization ratio of lubricating oil.

4. Through the setting of choke groove for pressure differential conversion between the roots blower inside and the atmosphere is the pressure differential of roots blower and choke groove and the pressure differential between choke groove and the atmosphere, has reduced the inside and outside direct pressure differential of roots blower, and then has reduced the speed of leaking out in the roots blower, has improved roots blower's pressurize effect.

Drawings

FIG. 1 is an exploded view of the overall structure from one perspective of the related art;

FIG. 2 is an exploded view of the overall structure from another perspective of the related art;

FIG. 3 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 4 is an exploded view of the overall structure from one perspective of an embodiment of the present application;

fig. 5 is an exploded view of the overall structure from another perspective of an embodiment of the present application.

Description of reference numerals: 110. a housing; 120. a driving rotor; 121. a driving rotating shaft; 122. a driving blade; 130. a driven rotor; 131. a driven rotating shaft; 132. a driven blade; 140. a front end cover; 150. a rear end cap; 160. a bearing; 170. an input gear; 180. an output gear; 190. an oil throwing piece; 210. a housing; 211. a bearing groove; 212. a retainer groove; 213. oil discharge grooves; 214. heat dissipation holes; 220. a rotating shaft; 230. an end cap; 231. a lubricating oil cavity; 240. a positioning sleeve; 241. a wind resistance groove; 310. a bearing; 320. an oil-resistant retainer ring; 330. a sleeve; 340. an oil throwing piece; 410. a first oil tank; 420. a second oil tank.

Detailed Description

The present application is described in further detail below with reference to figures 3-5.

The embodiment of the present application provides an oil lubrication structure, and referring to fig. 3 and 4, the oil lubrication structure includes a housing 210, a rotating shaft 220 rotatably connected to the housing 210, and an end cover 230 fixedly connected to the housing 210 by a bolt.

Referring to fig. 4 and 5, a bearing 310 is coaxially sleeved on the rotating shaft 220, a bearing groove 211 is formed in an end surface of the housing 210 close to the end cover 230, and the bearing 310 is further clamped in the bearing groove 211 by a cold-fitting method. A lubricating oil cavity 231 is formed between the end cover 230 and the housing 210, lubricating oil is filled in the lubricating oil cavity 231, an oil discharge groove 213 is formed at the bottom end of the bearing groove 211, and the oil discharge groove 213 is communicated with the lubricating oil cavity 231.

Referring to fig. 4 and 5, the rotating shaft 220 is further provided with an oil slinger 340 for slinging the lubricating oil to the bearing 310, the oil slinger 340 may be a gear or an oil slinger, and in the embodiment of the present invention, the oil slinger 340 is a gear. The gear is coaxially fitted over the rotating shaft 220, and then the gear is fixed to the rotating shaft 220 using a bolt. The gear is disposed in the lubricating oil chamber 231, the liquid level of the lubricating oil in the lubricating oil chamber 231 is higher than the lower end line of the gear, and the liquid level of the lubricating oil in the lubricating oil chamber 231 is not higher than the lower end line of the bearing 310. When the rotating shaft 220 rotates, the lubricant in the lubricant chamber 231 is thrown into the bearing 310 by the gear, and the bearing 310 is cooled and lubricated.

If the oil slinger 340 is an oil slinger, the oil slinger is sleeved on the rotating shaft 220, and then the oil slinger is fixed on the rotating shaft 220 by using bolts. The oil thrower is to be disposed in the lubricating-oil chamber 231, the liquid level of the lubricating oil in the lubricating-oil chamber 231 is to be higher than the lower end line of the oil thrower, and the liquid level of the lubricating oil in the lubricating-oil chamber 231 is not higher than the lower end line of the bearing 310.

Referring to fig. 4 and 5, a positioning sleeve 240 for positioning the bearing 310 is further sleeved on the rotating shaft 220, and an oil-proof check ring 320 is coaxially sleeved on the positioning sleeve 240. The positioning sleeve 240 is coaxially disposed with the rotating shaft 220, and the positioning sleeve 240 is sleeved on the rotating shaft 220 by a shrink fit method. The locating sleeve 240 is arranged on the side of the bearing 310 far away from the end cover 230, and one end of the locating sleeve 240 close to the end cover 230 abuts against the inner ring of the bearing 310. Thus, the bearing 310 is not easy to slide towards the positioning sleeve 240 along the axial direction of the rotating shaft 220 under the positioning action of the positioning sleeve 240, and the stability of the bearing 310 is improved.

Referring to fig. 4 and 5, a sleeve 330 is further disposed between the oil slinger 340 and the bearing 310, the sleeve 330 is coaxially sleeved on the rotating shaft 220, one end of the sleeve 330 abuts against an inner ring of the bearing 310, and the other end of the sleeve 330 abuts against one end surface of the oil slinger 340 close to the bearing 310. The nut presses the oil slinger 340 against the sleeve 330 while securing the oil slinger 340 to the rotating shaft. Therefore, the bearing is not easy to slide towards the oil throwing piece 340 along the axial direction of the rotating shaft 220 under the positioning action of the sleeve 330, and the stability of the bearing is improved.

Referring to fig. 4 and 5, a retainer groove 212 for placing the oil-proof retainer ring 320 is formed in the housing 210, and the retainer groove 212 is communicated with the bearing groove 211. The oil-proof retainer 320 is sleeved on one end of the positioning sleeve 240 close to the bearing 310, and the oil-proof retainer 320 is placed in the retainer groove 212. The inner circumferential surface of the oil-proof ring 320 is in interference fit with the outer circumferential surface of the positioning sleeve 240, the outer circumferential surface of the oil-proof ring 320 is in contact with the inner circumferential surface of the retainer groove 212, and the outer circumferential surface of the oil-proof ring 320 is in clearance fit with the inner circumferential surface of the retainer groove 212. The inner diameter of the retainer groove 212 is smaller than the inner diameter of the bearing groove 211, and the length of the retainer groove 212 in the axial direction thereof is larger than the length of the oil resistant retainer 320 in the axial direction thereof. After the oil-proof check ring 320 is sleeved on the positioning sleeve 240, both ends of the oil-proof check ring 320 in the axial direction are not abutted with the bearing 310 nor the housing 210.

The oil-proof retainer ring 320 is arranged to prevent the lubricating oil in the bearing 310 from leaking from the end far away from the lubricating oil chamber 231, and when the rotating shaft 220 rotates, the oil-proof retainer ring 320 is not easy to rub against the bearing 310 or the housing 210, so that the service life of the oil-proof retainer ring 320 is prolonged, and the frequency of maintaining the oil-proof retainer ring 320 is reduced. Because the diameter of the retainer groove 212 is smaller than that of the bearing groove 211, the lubricating oil flows between the oil-proof retainer ring 320 and the bearing 310 and then flows into the bearing groove 211 again under the action of gravity, and then flows into the lubricating oil cavity 231 through the oil discharge groove 213, so that the lubricating oil in the part is reused, and the utilization rate of the lubricating oil is improved.

Referring to fig. 4 and 5, a plurality of choke grooves 241 are further formed in the outer circumferential surface of the positioning sleeve 240, the choke grooves 241 are disposed at one end of the positioning sleeve 240 away from the bearing 310, and the choke grooves 241 are uniformly distributed along the axial direction of the positioning sleeve 240. Since the pressure in the Roots blower is greater than atmospheric pressure, air inside the Roots blower is discharged to the atmosphere through the gap between the retainer 240 and the housing 210. During the inside air of roots's fan can leak earlier to choke groove 241, later in leaking to the atmosphere through choke groove 241 again, because the setting of choke groove 241 for the pressure differential between the inside of roots's fan and choke groove 241 is less than the pressure differential between the inside and the atmosphere of roots's fan, and then has reduced the inside speed of leaking out to in choke groove 241 of roots's fan, has improved roots's fan's pressurize performance.

Referring to fig. 4 and 5, the housing 210 further has heat dissipating holes 214 for dissipating heat from the rotating shaft 220, the heat dissipating holes 214 are formed at a side of the retainer groove 212 away from the bearing groove 211, and the heat dissipating holes 214 are formed at a lower portion of the housing 210. One end of the heat radiating hole 214 communicates with the atmosphere, and the other end of the heat radiating hole 214 communicates with the inside of the case 210.

When the bearing 310 rotates, heat is generated, and at this time, a part of the heat is absorbed by the lubricant, and is transferred to the housing through the outer ring of the bearing 310, and then transferred to the atmosphere, and a part of the heat is transferred to the rotating shaft 220 through the inner ring of the bearing 310. Due to the arrangement of the heat dissipation holes 214, the rotating shaft 220 can be directly contacted with the atmosphere, and the heat on the rotating shaft 220 can be dissipated into the atmosphere through the heat dissipation holes 214, so that the probability that the rotating shaft 220 is expanded by heating and then is blocked in the shell 210 is reduced; since the heat dissipation rate of the rotating shaft 220 is increased, the outer ring of the bearing 310 is not easily expanded by heat, and the performance of the bearing 310 is improved. The heat dissipation holes 214 are formed at the lower end of the housing 210, so that impurities in the air are not easily floated into the heat dissipation holes 214, the rate of abrasion of the rotating shaft 220 and the positioning sleeve 240 is reduced, and the rotating shaft 220 and the positioning sleeve 240 are protected.

The implementation principle of an oil lubrication structure of the embodiment of the application is as follows:

during operation, a certain amount of lubricating oil can be stored in the lubricating oil chamber 231, and when the bearing 310 rotates, the oil throwing member 340 throws the lubricating oil in the lubricating oil chamber 231 onto the bearing 310, so that the bearing 310 can be lubricated by the lubricating oil continuously. When the lubricating oil flows out from the end of the bearing 310 far away from the lubricating oil chamber 231, the oil-resistant retainer ring 320 prevents the lubricating oil from continuously flowing towards the end far away from the lubricating oil chamber 231, and under the action of gravity, the lubricating oil flows into the bearing groove 211 again and then flows into the lubricating oil chamber through the oil relief groove 213, so that the probability of leakage of the lubricating oil from the end of the bearing 310 far away from the lubricating oil chamber 231 is reduced, and the utilization rate of the lubricating oil is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. An oil lubricating structure comprises a shell (210), a rotating shaft (220) and an end cover (230), wherein the rotating shaft (220) is rotatably connected to the shell (210) along the axis of the rotating shaft (220), the rotating shaft (220) is sleeved with a bearing (310), a bearing groove (211) is formed in the shell (210), the bearing (310) is clamped in the bearing groove (211), the end cover (230) is fixedly connected to the shell (210), a lubricating oil cavity (231) is formed between the end cover (230) and the shell (210), an oil throwing piece (340) is further arranged on the rotating shaft (220), the oil throwing piece (340) is arranged in the lubricating oil cavity (231), and the lubricating oil cavity (231) is communicated with the bearing groove (211); the oil-proof structure is characterized in that an oil-proof retainer ring (320) for blocking lubricating oil leakage is arranged on the shell (210), the oil-proof retainer ring (320) is arranged at one end, away from the end cover (230), of the bearing (310), and the oil-proof retainer ring (320) is abutted to the inner circumferential surface of the shell (210).

2. An oil lubricating structure according to claim 1, characterized in that: the oil slinger (340) is a gear or an oil slinger, and the gear or the oil slinger is coaxially and fixedly connected to the rotating shaft (220).

3. An oil lubricating structure according to claim 1, characterized in that: the outer circumferential surface of the oil-resistant retainer ring (320) is in clearance fit with the inner circumferential surface of the shell (210).

4. An oil lubricating structure according to any one of claims 1 to 3, characterized in that: the oil-resistant oil seal ring is characterized in that a retainer ring groove (212) for placing an oil-resistant retainer ring (320) is formed in the shell (210), and the axial length of the retainer ring groove (212) is larger than the thickness of the oil-resistant retainer ring (320).

5. An oil lubricating structure according to claim 4, characterized in that: an oil unloading groove (213) is further formed in the inner wall of the bearing groove (211), the oil unloading groove (213) is formed in the bottom end line of the bearing groove (211), and the oil unloading groove (213) is communicated with the lubricating oil cavity (231).

6. An oil lubricating structure according to claim 4, characterized in that: the inner diameter of the retainer groove (212) is smaller than the inner diameter of the bearing groove (211).

7. An oil lubricating structure according to claim 4, characterized in that: coaxial cover is equipped with position sleeve (240) on axis of rotation (220), just the one end of position sleeve (240) with the inner circle butt of bearing (310), oil-proof retaining ring (320) cover is established on position sleeve (240).

8. An oil lubricating structure according to claim 7, characterized in that: the positioning sleeve (240) is further provided with a wind resistance groove (241), and the wind resistance groove (241) is formed in one end, far away from the bearing (310), of the positioning sleeve (240).

9. An oil lubricating structure according to claim 4, characterized in that: the casing (210) is provided with a heat dissipation hole (214) for heat dissipation, the heat dissipation hole (214) is formed in one side, away from the lubricating oil cavity (231), of the retainer ring groove (212), one end of the heat dissipation hole (214) is communicated with the atmosphere, and the other end of the heat dissipation hole (214) is communicated with the inside of the casing (210).

10. An oil lubricating structure according to claim 9, characterized in that: the heat dissipation hole (214) is opened at the lower part of the housing (210).

Images