Low-noise rotary motion type precision bearing

Abstract

The utility model relates to the field of linear bearings, and discloses a low-noise rotary motion type precision bearing which comprises an outer sleeve, end covers arranged at the two ends of the outer sleeve and steel balls, and a plurality of runway-shaped circulating raceways are evenly formed between the outer sleeve and the end covers at intervals in the circumferential direction of the outer sleeve. Each circulating raceway comprises a non-working ball groove assembly hidden in the inner wall of the outer sleeve, a working ball groove assembly which is located in the inner ring of the outer sleeve and exposes the steel balls, and a rotating ball groove assembly which is located in the end cover and connects the working ball groove and the non-working ball groove, and a retaining chain made of plastic moves in each circulating raceway in the circumferential direction of the circulating raceway. The steel balls are evenly arranged on the retaining chain at intervals in a rolling mode, the bearing has a good noise reduction effect, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of linear bearings, in particular to a low-noise rotary motion precision bearing. Background Art

[0002] A linear bearing is a linear motion system that is used in cooperation with a guide shaft during a linear stroke. Since the steel balls bearing the load are in point contact with the outer ring of the bearing and the steel balls roll with the smallest frictional resistance, the linear bearing has the characteristics of small friction and stable movement, so that a smooth linear motion with high sensitivity and high precision can be obtained.

[0003] The structure of the existing linear bearing can refer to the linear bearing disclosed in the Chinese patent with the publication number CN219911504U, which includes a cage and an outer ring sleeved outside the cage. A plurality of rotating ring grooves are circumferentially distributed on the outer side of the cage. The circulating groove includes a working ball track and a non-working ball track. A plurality of working raceways corresponding to the working ball tracks one by one and a plurality of non-working raceways corresponding to the non-working ball tracks one by one are circumferentially distributed on the inner wall of the outer ring. A number of steel balls fill the circulating groove and roll circumferentially around the circulating groove while rotating.

[0004] For the existing linear bearing, its cage, outer ring and steel balls are all made of metal. The steel balls are always in contact, collision and friction with each other during the movement. With use, phenomena such as wear and heat generation will occur. Moreover, when the steel balls circulate and switch between the working raceway and the non-working raceway, preloading intrusion and preloading release will be repeatedly performed. This process will strengthen the collision between the steel balls, thereby accelerating the wear of the steel balls. The collision of the steel balls and the wear of the steel balls will both increase the noise of the bearing during use. Summary of the Utility Model

[0005] Aiming at the disadvantages of the existing linear bearing that the steel balls are prone to wear and the noise becomes larger, the utility model provides a low-noise rotary motion precision bearing that can effectively delay the wear of the steel balls.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] The low-noise rotary motion precision bearing includes an outer sleeve, end covers arranged at both ends of the outer sleeve, and steel balls. A number of racetrack-shaped circulating raceways are evenly spaced circumferentially around the outer sleeve between the outer sleeve and the end covers. The circulating raceway includes a non-working ball track component hidden in the inner wall of the outer sleeve, a working ball track component located inside the inner ring of the outer sleeve and exposing the steel balls, and a rotary ball track component located inside the end cover and connecting the working ball track and the non-working ball track. A retaining chain made of plastic moves along the circumference of each circulating raceway, and the steel balls are evenly spaced and arranged on the retaining chain.

[0008] With the above solution, the retaining chain separates each steel ball, eliminating the friction and collision between the steel balls, delaying the wear of the steel balls. The retaining chain is made of plastic, and the friction noise between the steel balls and the plastic is extremely low. The wear degree of the steel balls is significantly reduced. This bearing has a good noise reduction effect and can effectively extend the service life of the bearing.

[0009] Preferably, the non-working raceway assembly, the working raceway assembly, and the revolving raceway assembly are made of plastic.

[0010] With the above solution, when the steel balls rub against these plastic parts, the noise is extremely small. Compared with the prior art, it has a significant noise reduction effect.

[0011] Preferably, the revolving raceway assembly includes a track cover fixedly arranged between the end cover and the outer sleeve, and an arc track protruding from one end of the track cover facing the end cover. There is a track groove recessed in the end cover for the arc track to insert into. A revolving raceway for the retaining chain with steel balls to revolve is formed between the track groove and the arc track.

[0012] With the above solution, the arc track is made of plastic, and the friction noise between the steel balls and the plastic is extremely low, having a significant noise reduction effect.

[0013] Preferably, the working raceway assembly includes spacers inserted circumferentially and spaced apart around the inner ring of the outer sleeve. Both ends of the spacers are fixedly connected to the track cover, and first guide grooves for one side of the retaining chain to be inserted and guided to slide are provided through both sides of the spacers.

[0014] With the above solution, the spacers and the retaining chain are made of plastic, and the sliding friction noise between the plastics is extremely low, having a significant noise reduction effect.

[0015] Preferably, the non-working raceway assembly includes a pipe through which the retaining chain with steel balls can pass, and a connecting pipe protruding from one side of the track cover away from the arc track and communicating with the arc track and capable of being spliced with the pipe. Circular grooves for the pipe to pass through are uniformly spaced and penetrated circumferentially at both ends of the outer sleeve. A non-working raceway is formed inside the pipe and the connecting pipe, and second guide grooves for both sides of the retaining chain to be inserted and guided to slide are symmetrically provided on the inner wall of the pipe.

[0016] With the above solution, both the connecting pipe and the pipe are made of plastic. When the steel balls roll on the plastic, the noise is extremely low, having a significant noise reduction function.

[0017] Preferably, the connecting pipe and the pipe are directly connected through a first splicing structure, the spacer and the track cover are connected through a second splicing structure, and the end cover, the track cover, and the outer sleeve are fixedly connected through a threaded structure.

[0018] With the above - mentioned solution, the connecting pipe and the pipeline, and the gasket and the track cover are first spliced and positioned, and finally the fixing connection of these components is realized by using the threaded structure.

[0019] Preferably, the first splicing structure includes splicing grooves recessed at both ends of the pipeline and splicing blocks protruding from one end of the connecting pipe away from the track cover and spliced with the splicing grooves.

[0020] Preferably, the second splicing structure includes clamping protrusions protruding from both ends of the gasket and clamping grooves opened on the track cover for the clamping protrusions to be clamped into.

[0021] Preferably, the threaded structure includes bolts, first counter - sunk holes circumferentially and evenly spaced on the end cover, second through - holes correspondingly opened on the track cover, and threaded holes correspondingly arranged at both ends of the outer sleeve. The bolts pass through the first counter - sunk holes and the second through - holes in sequence and are screwed with the threaded holes.

[0022] Since the present utility model adopts the above - mentioned technical solutions, it has remarkable technical effects: a retaining chain is added, and the steel balls are arranged at intervals and roll on the retaining chain, eliminating the friction and collision between the steel balls, reducing the noise of the steel ball operation. The retaining chain, the track cover, the gasket and the pipeline are all made of plastic, and the friction noise between the steel balls and these components is extremely small, further reducing the noise of the steel ball operation. This bearing significantly reduces the noise during operation and extends the service life. Description of the Drawings

[0023] Figure 1 is the axonometric view of the low - noise rotary motion type precision bearing of this embodiment;

[0024] Figure 2 is the exploded view of the low - noise rotary motion type precision bearing of this embodiment;

[0025] Figure 3 is Figure 2 the enlarged view of A of

[0026] Figure 4 is Figure 2 the enlarged view of B of

[0027] Figure 5 is Figure 2 the enlarged view of C of

[0028] Figure 6 is Figure 2 the enlarged view of D of

[0029] Figure 7 is the front view of the low - noise rotary motion type precision bearing of this embodiment;

[0030] Figure 8 is Figure 7 the sectional view taken along A - A of

[0031] The names of the parts referred to by each digital label in the above drawings are as follows: 1. End cover; 101. First countersunk hole; 102. Track groove; 2. Outer sleeve; 201. Circular groove; 202. Threaded hole; 3. Track cover; 301. Second through hole; 302. Arc track; 303. Connecting pipe; 304. Card slot; 305. Split block; 306. Third guide groove; 4. Retaining chain; 5. Pipe; 501. Splicing groove; 502. Second guide groove; 6. Gasket; 601. Card convex; 602. First guide groove; 7. Steel ball. Specific embodiments

[0032] The present utility model will be further described in detail below in conjunction with the drawings and embodiments.

[0033] The low-noise rotary motion type precision bearing, as shown in reference to Figures 1 to 8 includes an outer sleeve 2, end covers 1 provided at both ends of the outer sleeve 2, and steel balls 7. A plurality of racetrack-shaped circulating raceways are evenly spaced circumferentially around the outer sleeve 2 between the outer sleeve 2 and the end covers 1. The circulating raceway is composed of a non-working raceway, a working raceway, and two rotary raceways respectively connecting the non-working raceway and the working raceway. The non-working raceway is arranged in the non-working raceway assembly, the working raceway is arranged between the working raceway assembly and the outer sleeve, and the rotary raceway is arranged between the end cover and the rotary raceway assembly. A retaining chain 4 made of plastic moves axially along the circulating raceway in the circulating raceway. The steel balls 7 are arranged to roll at intervals on the retaining chain 4. The retaining chain 4, the working raceway assembly, the non-working raceway assembly, and the rotary raceway assembly are made of plastic. Lubricating oil is coated on the retaining chain 4, the steel balls 7, and the inside of the circulating raceway to ensure the smooth operation of the retaining chain 4 and the steel balls 7.

[0034] Combined with Figure 2 and Figure 3 shown, the rotary raceway assembly includes a track cover 3 made of plastic. The track cover 3 is located between the end cover 1 and the outer sleeve 2. An arc track 302 is integrally protruded on one side of the track cover 3 close to the end cover 1. A track groove 102 for inserting the arc track 302 is recessed on one side of the end cover 1 facing the track cover 3. A rotary raceway for guiding the retaining chain 4 with steel balls 7 to pass through is formed between the track groove 102 and the arc track 302.

[0035] The non-working raceway is hidden in the inner wall of the outer sleeve 2. Combined with Figure 2As shown, it includes a pipe 5 for guiding the retaining chain 4 with steel balls 7 to pass through, and a connecting pipe 303 protruding from the side of the track cover 3 away from the arc track 302, which is connected to the arc track 302 and spliced ​​with the pipe 5. Circular grooves 201 for the pipe 5 to pass through are evenly spaced at both ends of the outer sleeve 2 around the circumference of the outer sleeve 2, and a non-working ball track is formed inside the pipe 5 and inside the connecting pipe 303. The inner wall of the pipe 5 is symmetrically provided with second guide grooves 502 for the two sides of the retaining chain 4 to be embedded and guided to slide, and the inner wall of the connecting pipe 303 is symmetrically provided with third guide grooves 306 that dock with the second guide grooves 502.

[0036] The working ballway assembly includes gaskets 6 inserted at intervals around the outer casing 2 at the inner ring of the outer casing 2, combined with Figure 2 and Figure 4 As shown, the gasket 6 is arc-shaped as a whole, and the gasket 6 is attached to the inner ring wall of the outer sleeve 2. The two ends of the gasket 6 are spliced ​​with the track cover 3. The two sides of the gasket 6 are symmetrically provided with a first guide groove 602 for one side of the retaining chain 4 to be embedded and guided to slide. A working ball track is formed between the spacing between adjacent gaskets 6 and the inner ring wall of the outer sleeve.

[0037] Combination Figures 2 to 6 As shown, a block 305 is convexly provided at one end of the connecting pipe 303 away from the track cover 3, and splicing grooves 501 for splicing the block 305 are concavely provided at both ends of the pipe 5, and protrusions 601 are convexly provided at both ends of the gasket 6. A groove 304 for the protrusion 601 to be inserted is provided on the track cover 3, and first countersunk holes 101 are evenly spaced circumferentially on the end cover 1, and second through holes 301 corresponding to the first countersunk holes 101 are provided on the track cover 3. Threaded holes 202 corresponding to the second through holes 301 are provided at both ends of the outer sleeve 2. After the block 305 is spliced ​​with the splicing groove 501, and the protrusion 601 is engaged with the slot 304, the bolts pass through the first countersunk hole 101 and the second through hole 301 in sequence and are screwed with the threaded hole 202.

[0038] During installation, first assemble the track cover 3, the pipe 5, the outer sleeve 2 and the gasket 6; then, pass the linear retaining chain 4 through the first guide groove 602, the arc track 302, the second guide groove 502 and the third guide groove 306 in sequence, and then glue, rivet or snap together the two ends to form a closed loop; then, screw and lock the end cover 1, the track cover 3 and the outer sleeve 2; finally, fill the steel balls 7 into the retaining chain 4 from the spacing of the gasket 6.

[0039] A retaining chain 4 is added, and steel balls 7 are arranged on the retaining chain 4 in a rolling manner at intervals, which eliminates friction and collision between the steel balls 7 and reduces the noise of the steel balls 7 when they are running. The retaining chain 4, the track cover 3, the gasket 6 and the pipe 5 are all made of plastic. The friction noise between the steel balls 7 and these components is extremely small, which further reduces the noise of the steel balls 7 when they are running. The bearing significantly reduces the noise during operation and extends its service life.

[0040] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A low-noise rotary motion type precision bearing, comprising an outer sleeve (2), end covers (1) arranged at both ends of the outer sleeve (2), and steel balls (7), characterized in that: A plurality of racetrack-shaped circulating raceways are formed between the outer sleeve (2) and the end cover (1) at even intervals around the circumference of the outer sleeve (2). The circulating raceways include a non-working raceway component hidden in the inner wall of the outer sleeve (2), a working raceway component located in the inner ring of the outer sleeve (2) and exposing the steel balls (7), and a revolving raceway component located in the end cover (1) and connecting the working raceway and the non-working raceway. In each circulating raceway, a retaining chain (4) made of plastic moves along the circumference of the circulating raceway, and the steel balls (7) are evenly spaced and rolled on the retaining chain (4).

2. The low-noise rotary motion type precision bearing according to claim 1, characterized in that: The non-working ball lane component, the working ball lane component and the rotating ball lane component are made of plastic.

3. The low-noise rotary motion type precision bearing according to claim 2, characterized in that: The revolving ball track assembly comprises a track cover (3) fixedly arranged between an end cover (1) and an outer cover (2) and an arc track (302) protruding from one end of the track cover (3) facing the end cover (1); a track groove (102) for the arc track (302) to be inserted into is recessed on the end cover (1); a revolving ball track is formed between the track groove (102) and the arc track (302) for a retaining chain (4) with a steel ball (7) to revolve.

4. The low-noise rotary motion type precision bearing according to claim 3, characterized in that: The working ballway assembly comprises gaskets (6) inserted at intervals around the outer casing (2) at the inner ring of the outer casing (2), the two ends of the gasket (6) being fixedly connected to the track cover (3), and first guide grooves (602) for one side of the retaining chain (4) to be embedded and guided to slide are provided through both sides of the gasket (6).

5. The low-noise rotary motion type precision bearing according to claim 4, characterized in that: The non-working ball track component comprises a pipe (5) through which a retaining chain (4) with a steel ball (7) can pass, and a connecting pipe (303) protruding from a side of the track cover (3) away from the arc track (302), communicating with the arc track (302) and being spliced ​​with the pipe (5); circular grooves (201) through which the pipe (5) can pass are evenly spaced and arranged at both ends of the outer sleeve (2) around the circumference of the outer sleeve (2); the inside of the pipe (5) and the inside of the connecting pipe (303) form a non-working ball track; and the inner wall of the pipe (5) is symmetrically provided with second guide grooves (502) into which the two sides of the retaining chain (4) can be embedded and guided to slide.

6. The low-noise rotary motion type precision bearing according to claim 5, characterized in that: The connecting pipe (303) is directly connected to the pipeline (5) via a first splicing structure, the gasket (6) is connected to the track cover (3) via a second splicing structure, and the end cover (1), the track cover (3) and the outer sleeve (2) are fixedly connected via a threaded structure.

7. The low-noise rotary motion type precision bearing according to claim 6, characterized in that: The first splicing structure comprises splicing grooves (501) recessed at both ends of the pipeline (5) and a splicing block (305) protruding from one end of the connecting pipe (303) away from the track cover (3) and spliced ​​with the splicing grooves (501).

8. The low-noise rotary motion type precision bearing according to claim 6, characterized in that: The second splicing structure comprises locking protrusions (601) protruding from both ends of the gasket (6) and locking grooves (304) opened on the track cover (3) into which the locking protrusions (601) can be locked.

9. The low-noise rotary motion type precision bearing according to claim 6, characterized in that: The threaded structure comprises a bolt, first countersunk holes (101) uniformly spaced circumferentially on the end cover (1), second through holes (301) correspondingly opened on the track cover (3), and threaded holes (202) correspondingly arranged at both ends of the outer sleeve (2); the bolt passes through the first countersunk hole (101) and the second through hole (301) in sequence and is then threadedly connected to the threaded hole (202).

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