CN114909403A

CN114909403A - High-precision super-miniature bearing

Info

Publication number: CN114909403A
Application number: CN202210511631.4A
Authority: CN
Inventors: 田峰淼; 刘九林; 宋熙
Original assignee: Daw Bearing Co ltd
Current assignee: Daw Bearing Co ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-08-16
Anticipated expiration: 2042-05-10
Also published as: CN114909403B

Abstract

The invention discloses a high-precision extra-miniature bearing, which belongs to the technical field of bearings, and solves the problems that the existing extra-miniature bearing is lubricated by injecting lubricating grease through a lubricating grease injection device, and ball balls are easy to rub and damage, so that the service life of the bearing is influenced; the oil supply ventilation structure is inserted on the outer barrel seat at the outer end of the inner barrel seat, the annular rotating sealing strip is installed at the outer end of the inner barrel seat and inserted on one side face of the air barrel included by the oil supply ventilation structure, the annular downstream groove for oil supply is arranged in the air barrel, and a plurality of groups of through holes communicated with the annular downstream groove are arranged on the air barrel.

Description

High-precision super-miniature bearing

Technical Field

The invention relates to the technical field of bearings, in particular to a high-precision ultra-miniature bearing.

Background

The bearing is an important part in the modern mechanical equipment. Its main function is to support the mechanical rotator, reduce the friction coefficient in its motion process, and guarantee its gyration precision.

Along with the development of science and technology, the bearing is used in more and more places, for example in the support rotating part of some precision instruments, because dimensional requirement, bearing design manufacturing size is littleer and more, in order to satisfy the rotation support of high-accuracy components and parts, simultaneously along with bearing size is littleer and more, the lubricating grease filling problem of woods that faces appears prominently more, for some special miniature bearings, prior art through injecting lubricating grease device insert the injection head in the steel ball hole reinjection lubricating grease, the injection head rubs with the steel ball and causes the steel ball damage easily, the iron fillings that the injection head weared simultaneously also can get into inside the bearing, influence bearing noise and life-span, and former steel ball locate mode injection can cause the injection head difficult processing, injection channel width size only has 0.2mm, there is the volatility, the grease blocks up scheduling problem easily.

Based on the problems, the invention provides a high-precision ultra-micro bearing.

Disclosure of Invention

In view of the above problems in the prior art background, the present invention is directed to provide a high-precision extra-miniature bearing, which changes the original lubricating grease injection manner, and utilizes the rotation of the inner ring of the extra-miniature bearing to drive the drainage effect to suck and spray the lubricating grease on the retainer and the balls by installing a flow-sucking turbofan at the outer side of the inner ring of the extra-miniature bearing, and on the other hand, through the unique flow channel design, the flow-sucking turbofan sucks air to dissipate heat during the rotation of the inner ring of the extra-miniature bearing, so that the rotation of the extra-miniature bearing is not affected by overheating, the rotation precision is improved, and the problem that the service life of the bearing is affected by the damage of the steel balls due to the collision and the damage of the injected lubricating grease by the lubricating grease device in the existing extra-miniature bearing in the background art is solved.

In order to realize the purpose, the invention solves the problem that the service life of the bearing is influenced by the fact that the steel ball is easy to be damaged by rubbing and the lubricating grease is injected into the special miniature bearing through a lubricating grease injection device, and adopts the technical scheme that:

a high-precision ultra-miniature bearing comprises a bearing outer ring, a bearing inner ring, a retainer and balls, wherein the balls are arranged between the bearing outer ring and the bearing inner ring through the retainer,

a turbofan-like grease injection assembly is further arranged on one side of the bearing outer ring and one side of the bearing inner ring and comprises an outer cylinder seat and a turbofan, a plurality of sets of turbofan blades are uniformly arranged on the periphery of the inner cylinder seat of the turbofan, a drainage channel is arranged on the extrusion air side of the turbofan blades, and one end of the drainage channel is aligned to the retainer;

an oil supply and ventilation structure is inserted on the outer cylinder seat at the outer side end of the inner cylinder seat, an oil supply annular downstream groove is arranged in an air cylinder contained by the oil supply and ventilation structure, and the annular downstream groove is communicated with the turbofan-like grease injection assembly through a plurality of groups of through holes.

As a further description of the above technical solution:

the oil supply ventilation structure comprises the air duct, an annular filter screen, an annular cover and a sealing barrel, wherein the air duct is concentrically provided with an annular groove with an opening facing outwards, the annular cover is installed on one side of the sealing barrel, the other end of the sealing barrel is installed in the annular groove, the air duct is provided with the annular cover, the filter screen is installed on the sealing barrel, the annular cover is evenly provided with a plurality of air holes, and the annular downstream groove is arranged on the inner side of the annular groove and is arranged on the air duct.

As a further description of the above technical solution:

the anti-overflow ring is installed on the ring channel inner race, simultaneously ring channel top intercommunication runs through the second oil filler point of dryer roof, urceolus seat top runs through and sets up first oil filler point, the second oil filler point with first oil filler point intercommunication.

As a further description of the above technical solution:

the top of first oil filler point sets up the screw hole, is convenient for stably connect the oil supply pipeline in the outside, seal ring is installed at second oil filler point top.

As a further description of the above technical solution:

the inner diameter of the sealing cylinder is equal to that of the air cylinder, the outer diameter of the annular cover is equal to that of the annular groove, and meanwhile, the inner diameter and the outer diameter of the filter screen are respectively equal to that of the sealing cylinder and that of the annular groove.

As a further description of the above technical solution:

in order to avoid the friction of the installation shaft on the air duct, the inner diameter of the air duct is smaller than that of the inner duct seat.

As a further description of the above technical solution:

elastic locking pieces are symmetrically installed on the air duct, clamping grooves are symmetrically formed in the inner wall of the outer duct base, and the elastic locking pieces and the clamping grooves are in locking installation relation.

As a further description of the above technical solution:

protective housing is installed to the opposite side of bearing inner race, protective housing runs through the shaft hole that sets up the bearing and run through the axle in the middle part, simultaneously it sets up a plurality of air release grooves to be cyclic annular distribution on the protective housing.

As a further description of the above technical solution:

one ends of the inner cylinder seat and the outer cylinder seat are respectively arranged at one ends of the bearing outer ring and the bearing inner ring.

As a further description of the above technical solution:

annular rotation sealing strip is installed to inner tube seat outside end, set up annular seal groove on the side of dryer, it inserts to rotate the sealing strip in the seal groove.

Compared with the prior art, the invention has the following advantages:

(1) in the invention, a bearing outer ring and one side of a bearing inner ring are also provided with a similar turbofan grease injection assembly which comprises an outer cylinder seat and a turbofan, wherein a plurality of groups of turbofan blades are uniformly arranged on the outer cylinder surface of the inner cylinder seat of the turbofan, one side surface of the turbofan blade extruding air when rotating to guide the flow to the retainer is provided with a flow guide channel, one end of the flow guide channel is aligned with the retainer, an oil supply and ventilation structure is inserted on the outer cylinder seat at the outer side end of the inner cylinder seat, an annular rotating sealing strip is installed at the outer side end of the inner cylinder seat and inserted in the oil supply and ventilation structure, an air cylinder contained in the oil supply and ventilation structure is internally provided with an annular downstream groove for supplying oil, the annular downstream groove is communicated with the similar turbofan grease injection assembly through a plurality of through holes, after the rotating shaft is installed on the bearing, the inner cylinder seat at one side is driven to rotate along with the rotating shaft, the inner cylinder seat rotates to drive a plurality of turbofan blades on the cylinder surface to rotate, and a negative pressure area is formed by extruding the outer cylinder seat and the inner cylinder seat to the bearing outer ring and the bearing inner ring during the rotating of the turbofan, the annular downstream groove is communicated with the negative pressure area between the outer cylinder seat and the inner cylinder seat through the through holes, so that lubricating grease in the annular downstream groove is sucked into the negative pressure area between the outer cylinder seat and the inner cylinder seat in an oil drop mode, then the lubricating grease drops are adsorbed on the vortex fan blades, the lubricating grease drops are thrown into the retainer along a drainage channel on the high pressure side of the vortex fan blades and finally flow to the ball balls on the inner side through the retainer, the purpose of forming vortex by utilizing rotation of the ultra-micro bearing to inject the lubricating grease in a non-contact mode is achieved, friction damage caused by the existing contact type lubricating grease injection is avoided, and the service life of the ultra-micro bearing is greatly prolonged and the working accuracy is greatly improved.

(2) According to the invention, by utilizing the structure of injecting lubricating grease by using vortex, and meanwhile, the filter screen and the protective cover are arranged on the air duct, and the air hole is formed in the protective cover, so that outside air can be sucked through the air hole, filtered by the filter screen, enters the annular downstream groove, the through hole, the negative pressure region between the outer cylinder seat and the inner cylinder seat, finally passes through the ball between the outer ring and the inner ring of the bearing, and is discharged through the air discharge groove on the protective shell on the other side after heat is taken away, thereby realizing the effect of automatic heat dissipation, simultaneously filtering, ventilating and radiating to keep the interior of the ultra-miniature bearing clean, and prolonging the service life of the ultra-miniature bearing.

Drawings

Fig. 1 is a first perspective view provided in accordance with a first embodiment of the present invention;

fig. 2 is a perspective view of a second embodiment of the present invention;

FIG. 3 is a first exploded perspective view of the first embodiment of the present invention;

FIG. 4 is a perspective view of an exploded view of a first embodiment of the present invention;

FIG. 5 is a perspective view of a half-section of the rear outer cylinder base of the oil supply removal ventilation structure according to the first embodiment of the present invention;

fig. 6 is a half-sectional perspective view of the outer cylinder seat and the oil supply and ventilation structure after the filter screen is removed according to the first embodiment of the present invention;

fig. 7 is an exploded perspective view of an oil supply and ventilation structure according to an embodiment of the present invention;

fig. 8 is an exploded partial sectional perspective view of an oil supply and ventilation structure according to a first embodiment of the present invention;

fig. 9 is a partially cut-away perspective view of a first embodiment of the present invention.

In the figure: 1. a bearing outer race; 2. a bearing inner race; 3. a holder; 4. a ball; 5. an inner cylinder seat; 6. a vortex blade; 7. a drainage channel; 8. rotating the sealing strip; 9. an outer cylinder base; 10. a first oil filler hole; 11. a clamping groove; 12. an air duct; 13. an elastic locking member; 14. an annular groove; 15. an annular forward flow groove; 16. a through hole; 17. an anti-overflow ring; 18. a second oil filler hole; 19. a sealing groove; 20. a filter screen; 21. an annular cover; 22. a wind hole; 23. a sealing cylinder; 24. a protective housing; 25. a shaft hole; 26. a wind release groove.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Example one

Please refer to fig. 1-9, a high-precision super-miniature bearing, which comprises a bearing outer ring 1, a bearing inner ring 2, a retainer 3 and balls 4, wherein the balls 4 are installed between the bearing outer ring 1 and the bearing inner ring 2 through the retainer 3, a similar turbofan grease injection assembly is respectively installed on one side of the bearing outer ring 1 and one side of the bearing inner ring 2, the similar turbofan grease injection assembly comprises an outer cylinder seat 9 and a turbofan, the turbofan is composed of an inner cylinder seat 5 and a plurality of sets of turbofan blades 6 uniformly installed on the outer cylinder surface of the inner cylinder seat 5, the inner cylinder seat 5 and the sets of turbofan blades 6 are made of carbon steel or PVC, the inner cylinder seat 5 and the sets of turbofan blades 6 are welded when made of carbon steel, the inner cylinder seat 5 and the sets of turbofan blades 6 are connected by hot melting, a drainage channel 7 is arranged on one side surface of air extruded when the turbofan blades 6 rotate to drain the retainer 3, and one or more drainage channels 7 can be arranged according to requirements to improve the coverage of lubricating grease thrown into between the bearing outer ring 1 and the bearing inner ring 2 Area, one end of the drainage channel 7 is aligned with the retainer 3; the cartridge has the fuel feeding ventilation structure on the urceolus seat 9 of the outside end of inner cylinder seat 5, sets up the annular following current groove 15 of fuel feeding in the dryer 12 that the fuel feeding ventilation structure contained, and annular following current groove 15 communicates through multiunit through hole 16 class turbofan notes fat subassembly, through hole 16 play the mesh of introducing grease oil droplet granule on the one hand, and on the other hand can introduce outside air simultaneously, increases the carrier of grease transmission simultaneously and reduces the temperature of the inside ball 4 of special miniature bearing, and the fuel feeding pipeline in the outside is connected to annular following current groove 15.

The working principle of the technical scheme is that by utilizing the characteristic that a bearing inner ring 2 rotates along with a rotating shaft when a super-miniature bearing works, an outer cylinder seat 9 and an inner cylinder seat 5 are respectively arranged on one sides of a bearing outer ring 1 and the bearing inner ring 2, the inner cylinder seat 5 rotates along with the bearing inner ring 2 by fixedly installing the inner cylinder seat 5 and the bearing inner ring 2, then a plurality of groups of vortex blades 6 are evenly arranged on the outer cylinder surface of the inner cylinder seat 5, the plurality of groups of vortex blades 6 blow air to the bearing outer ring 1 and the bearing inner ring 2 in the rotating process, a negative pressure area is formed at the same time, then an oil supply ventilation structure is inserted on the outer cylinder seat 9 at the outer side end of the inner cylinder seat 5, an annular rotating sealing strip 8 arranged at the outer side end of the inner cylinder seat 5 is inserted on one side surface of an air cylinder 12 comprising the oil supply ventilation structure, an annular downstream groove 15 for supplying oil is arranged in the air cylinder 12, a plurality of through holes 16 communicated with the annular downstream groove 15 are arranged on the air cylinder 12, the lubricating grease in the annular downstream groove 15 is sucked into the negative pressure area through the through hole 16 in an oil drop mode through the negative pressure area, meanwhile, the bottom of the lubricating grease is adsorbed on the turbofan blade 6, meanwhile, the drainage channel 7 is arranged on the turbofan blade 6, the lubricating grease is thrown into the retainer 3 in the rotating process, the lubricating grease flows into the ball 4, the purpose of injecting the lubricating grease in a non-contact mode is achieved, meanwhile, the heat dissipation purpose can be achieved, and the service life and the precision of the special micro bearing are greatly prolonged.

Referring to fig. 6, 7 and 8, the oil supply and ventilation structure includes an air duct 12, an annular filter screen 20, an annular cover 21 and a sealing cylinder 23, the air duct 12 is concentrically provided with an annular groove 14 with an outward opening, one side of the annular cover 21 is provided with the sealing cylinder 23, the other end of the sealing cylinder 23 is arranged on the air duct 12 in the annular groove 14, the sealing cylinder 23 is provided with the filter screen 20, the filter screen 20 is preferably made of hard mesh material and is not preferably made of filter cotton, so as to prevent oil drops from entering and affecting permeability, the annular cover 21 is uniformly provided with a plurality of air holes 22, an annular downstream groove 15 is arranged on the air duct 12 inside the annular groove 14, and the air entering the special micro bearing is filtered by the filter screen 20, so as to prevent dust from entering and affecting rotation precision and service life.

Please refer to fig. 6 and 9, an anti-overflow ring 17 is installed on the inner ring outside the annular groove 14, meanwhile, the top of the annular groove 14 is communicated with a second oil hole 18 penetrating through the top wall of the air duct 12, a first oil hole 10 is penetrated through the top of the outer duct base 9, the second oil hole 18 is communicated with the first oil hole 10, the lubricating grease enters the second oil hole 18 through the first oil hole 10, then the second oil hole 18 penetrates into the annular downstream groove 15, meanwhile, the anti-overflow ring 17 is arranged to enable the lubricating grease to flow downwards only in the annular downstream groove 15, the lubricating grease is prevented from overflowing to be adhered to the filter screen 20 or remaining in the annular groove 14, and the lubricating grease dispersing efficiency is improved.

Referring to fig. 5 and 6, the top of the first oil filling hole 10 is provided with a threaded hole, so that the oil supply pipeline on the outer side can be stably connected, and the external oil supply pipeline is installed at the top of the first oil filling hole 10 through threads, so that oil supply is safer and more stable, and the anti-overflow performance is better.

A sealing gasket is arranged at the top of the second oil filling hole 18, and for increasing the mounting firmness of the sealing gasket, a groove for mounting the sealing gasket can be arranged at the top of the second oil filling hole 18, so that the connection tightness is improved.

Referring to fig. 6, 7 and 8, the inner diameter of the sealing cylinder 23 is equal to the inner diameter of the air cylinder 12, the outer diameter of the annular cover 21 is equal to the outer diameter of the annular groove 14, and the inner diameter and the outer diameter of the filter screen 20 are respectively equal to the outer diameter of the sealing cylinder 23 and the outer diameter of the annular groove 14.

Referring to fig. 6, in order to avoid the shaft from rubbing against the air duct 12, the inner diameter of the air duct 12 is smaller than that of the inner duct base 5, so as to increase the mounting and rotating precision of the rotating shaft.

Referring to fig. 3 and 4, the elastic locking pieces 13 are symmetrically installed on the surface of the air duct 12, the clamping grooves 11 are symmetrically formed on the inner wall of the outer duct base 9, the elastic locking pieces 13 are inserted into the clamping grooves 11, and the elastic locking pieces 13 are separated from the clamping grooves 11 by pressing the elastic locking pieces 13 with hands, so that the air duct 12 is unlocked first, and the air duct is directly inserted and installed during installation, thereby achieving the function of convenient assembly and disassembly.

Referring to fig. 3 and 4, a protective housing 24 is installed on the other side of the bearing outer ring 1, a shaft hole 25 of the bearing through shaft is arranged in the middle of the protective housing 24 in a penetrating manner, and a plurality of air leakage grooves 26 are annularly distributed on the protective housing 24, so that the protection of the ultra-miniature bearing is increased by arranging the protective housing 24, and the safety and stability of the operation of the ultra-miniature bearing are increased.

Referring to fig. 3 and 4, an annular sealing groove 19 is formed in one side surface of the air duct 12, the rotating sealing strip 8 is inserted into the sealing groove 19, the rotating sealing strip 8 is arranged at one end of the inner duct base 5 and inserted into the sealing groove 19 formed in one side surface of the air duct 12, the purpose that the lubricating grease in the negative pressure region leaks out through the installation gap between the inner duct base 5 and the air duct 12 is avoided, meanwhile, the rotating resistance of the air duct 12 to the inner duct base 5 is reduced, and the smooth operation is realized.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a high-accuracy special miniature bearing, includes bearing inner race (1), bearing inner race (2), holder (3) and ball (4), ball (4) are passed through holder (3) are installed bearing inner race (1) with between bearing inner race (2), its characterized in that:

a turbofan-like grease injection assembly is further arranged on one side of the bearing outer ring (1) and one side of the bearing inner ring (2) and comprises an outer cylinder seat (9) and a turbofan, a plurality of groups of turbofan blades (6) are uniformly installed on the periphery of an inner cylinder seat (5) of the turbofan, a drainage channel (7) is arranged on the side, where air is extruded by the turbofan blades (6), and one end of the drainage channel (7) is aligned with the retainer (3);

an oil supply ventilation structure is inserted on the outer cylinder seat (9) at the outer side end of the inner cylinder seat (5), an oil supply annular downstream groove (15) is arranged in an air cylinder (12) contained by the oil supply ventilation structure, and the annular downstream groove (15) is communicated with the turbofan-like grease injection assembly through a plurality of groups of through holes (16).

2. The high-precision extra-miniature bearing according to claim 1, wherein the oil supply and ventilation structure comprises the air duct (12), an annular filter screen (20), an annular cover (21) and a sealing cylinder (23), wherein the air duct (12) is concentrically provided with an annular groove (14) with an outward opening, the sealing cylinder (23) is installed on one side of the annular cover (21), the other end of the sealing cylinder (23) is installed on the air duct (12) in the annular groove (14), the filter screen (20) is installed on the sealing cylinder (23), the annular cover (21) is uniformly provided with a plurality of air holes (22), and the annular groove (15) is arranged on the air duct (12) at the inner side of the annular groove (14).

3. A high-precision ultra-micro bearing as claimed in claim 2, wherein an anti-overflow ring (17) is mounted on the inner ring of the annular groove (14), meanwhile, the top of the annular groove (14) is communicated with a second oil filling hole (18) penetrating through the top wall of the air duct (12), the top of the outer cylinder seat (9) is provided with a first oil filling hole (10) in a penetrating way, and the second oil filling hole (18) is communicated with the first oil filling hole (10).

4. A high precision ultra micro bearing according to claim 3, characterized in that the top of the first oil hole (10) is provided with a threaded hole for stable connection with the outside oil supply line, and the top of the second oil hole (18) is provided with a sealing gasket.

5. A high-precision ultra-micro bearing according to claim 2, characterized in that the inner diameter of the sealing cylinder (23) is equal to the inner diameter of the air duct (12), the outer diameter of the annular cover (21) is equal to the outer diameter of the annular groove (14), and the inner and outer diameters of the filter screen (20) are equal to the outer diameter of the sealing cylinder (23) and the outer diameter of the annular groove (14), respectively.

6. A high precision ultra micro bearing according to claim 5, characterized in that, in order to avoid the friction of the mounting shaft to the air duct (12), the inner diameter of the air duct (12) is smaller than the inner diameter of the inner duct base (5).

7. A high-precision ultra-micro bearing according to claim 1, wherein the air duct (12) is symmetrically provided with elastic locking pieces (13), the inner wall of the outer duct base (9) is symmetrically provided with clamping grooves (11), and the elastic locking pieces (13) and the clamping grooves (11) are in locking installation relation.

8. A high-precision ultra-miniature bearing according to claim 1, wherein a protective shell (24) is mounted on the other side of the bearing outer ring (1), a shaft hole (25) of a bearing through shaft is arranged in the middle of the protective shell (24) in a penetrating manner, and a plurality of air leakage grooves (26) are annularly distributed on the protective shell (24).

9. A high precision ultra micro bearing according to claim 1, characterized in that one end of the inner cylinder seat (5) and one end of the outer cylinder seat (9) are mounted on one end of the bearing outer ring (1) and one end of the bearing inner ring (2), respectively.

10. A high-precision ultra-micro bearing according to claim 1, wherein an annular rotating sealing strip (8) is installed at the outer end of the inner cylinder seat (5), an annular sealing groove (19) is arranged on one side surface of the air cylinder (12), and the rotating sealing strip (8) is inserted into the sealing groove (19).