CN221299840U

CN221299840U - Ball bearing and harmonic reducer applying same

Info

Publication number: CN221299840U
Application number: CN202323371280.0U
Authority: CN
Inventors: 陈琳尹; 岑明明; 陈彦丞
Original assignee: Ningbo Shangcheng Bearing Technology Co ltd
Current assignee: Ningbo Shangcheng Bearing Technology Co ltd
Filing date: 2023-12-09
Publication date: 2024-07-09
Anticipated expiration: 2033-12-09

Abstract

The ball bearing comprises a bearing inner ring, a bearing outer ring and a plurality of balls clamped between the bearing inner ring and the bearing outer ring, wherein the bearing inner ring is provided with a transmission shaft hole; the flexible harmonic wave shaping sleeve is stuck in the transmission bearing, the inner wall of the flexible harmonic wave shaping sleeve is provided with a first contact pattern, and the outer wall of the flexible harmonic wave shaping sleeve is provided with a second contact pattern. According to the utility model, through the arrangement of the first contact patterns, the contact area and the contact force between the inner wall of the flexible harmonic shaping sleeve and the wave generator can be effectively improved, and the contact area and the contact force between the outer wall of the flexible harmonic shaping sleeve and the inner ring of the bearing can keep the synchronous of the related parts under the condition of enough contact force, so that the relative displacement and abrasion are eliminated, and the defect of uneven stress is further eliminated, so that the ball bearing has better load expression and longer service life in practical application.

Description

Ball bearing and harmonic reducer applying same

Technical Field

The utility model relates to a ball bearing and a harmonic reducer applying the same.

Background

The harmonic reducer mainly comprises three basic components of a wave generator, a flexible gear and a rigid gear, wherein the wave generator comprises an elliptic cam and a flexible bearing assembled on the outer side of the cam, the harmonic reducer enables the flexible gear to generate controllable elastic deformation by means of the wave generator and is meshed with the rigid gear to transmit motion and power, and the harmonic reducer has the characteristics of high transmission precision, large transmission speed ratio and the like and is widely applied to the fields of aerospace, robots and the like. In the process of installation of the harmonic reducer, as the wave generator is required to be pressed into the flexible gear, the flexible gear is deformed, the external gear of the flexible gear is meshed with the internal gear of the rigid gear, the conventional installation method easily causes the defect of insufficient precision of the harmonic reducer, the meshing degree of the flexible gear and the rigid gear is not high, the harmonic reducer is more easily worn, and the service life is reduced.

The bearing applied to the harmonic reducer is a specific flexible bearing, so that the force contact point in the using process of the harmonic reducer is required to be changed continuously, and therefore, the bearing is a key part and a wearing part in the harmonic reducer.

Referring to the prior art example, see patent document CN214661837U, a four-point contact flexible bearing harmonic reducer is disclosed, including the wave generator, the rigid gear, flexible wheel and cross bearing, the wave generator is equipped with four-point contact flexible bearing, four-point contact flexible bearing locates in the flexible wheel, the flexible wheel is located in the rigid gear and is connected with the rigid gear meshing, the inner circle and the flexible wheel fixed connection of cross bearing, the outer lane and the rigid gear fixed connection of cross bearing, the rigid gear is equipped with the holding ring, the holding ring is equipped with first holding ring and second holding ring, first holding ring and rigid gear bolted connection, second holding ring and cross bearing bolted connection. The utility model can improve the fixed contact area of the harmonic reducer, improve the fixed effect of the harmonic reducer and facilitate the fixation and the disassembly of the harmonic reducer. However, in the technology, as the contact points are too few and all belong to point-to-point contact, the contact bearing area is small, the wear is easy, and an axial gap exists after the wear, so that the ball flexible bearing is easy to deform after bearing radial and axial force, and the flexible bearing is easy to damage, so that the rigidity of the input end of the harmonic reducer is reduced, the input end of the harmonic reducer cannot bear too large axial impact force, and the load and the service life of the harmonic reducer are reduced.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a ball bearing and a harmonic reducer using the same.

The technical scheme for solving the technical problems is as follows: the ball bearing comprises a bearing inner ring, a bearing outer ring and a plurality of balls clamped between the bearing inner ring and the bearing outer ring, wherein the bearing inner ring is provided with a transmission shaft hole;

the flexible harmonic shaping sleeve is stuck in the transmission shaft hole, the inner wall of the flexible harmonic shaping sleeve is provided with a first contact pattern, and the outer wall of the flexible harmonic shaping sleeve is provided with a second contact pattern.

The technical scheme is further characterized by further comprising a cover plate, wherein the cover plate is provided with an inner groove, the balls are at least partially positioned in the inner groove, the cover plate shields the balls, and the lower gasket abuts against the cover plate between the bearing inner ring and the bearing outer ring.

In the technical scheme, the outer wall of the bearing outer ring is provided with an annular groove.

In a further arrangement of the above technical solution, the annular groove is provided with a first magnetic member.

In another aspect of the utility model, a harmonic reducer is provided, including a wave generator, a flexible gear assembly and a rigid gear assembly, wherein a partial clearance fit is formed between the flexible gear assembly and the rigid gear assembly, so that the flexible gear assembly can be engaged with or disengaged from the rigid gear assembly; the flexible gear assembly further comprises the ball bearing, wherein the ball bearing penetrates through the flexible gear assembly, and the wave generator penetrates through the flexible harmonic shaping sleeve.

The technical scheme is further characterized in that an upper gasket is arranged at the upper end of the flexible harmonic shaping sleeve, and a lower gasket is arranged between the lower end of the flexible harmonic shaping sleeve and the wave generator;

An annular groove is formed in the lateral direction of the wave generator, a clamp spring is arranged in the annular groove, and at least part of the clamp spring extends out of the annular groove and presses the upper gasket on the flexible harmonic shaping sleeve;

The lower end of the wave generator is provided with a fool-proof positioning groove, the lower end of the lower gasket is convexly provided with a positioning block, and the positioning block is inserted into the fool-proof positioning groove.

With respect to the technical scheme, the anti-falling rib is arranged on the inner wall of the flexible gear assembly, and at least part of the anti-falling rib is clamped into the annular groove.

In a further aspect of the foregoing disclosure, a second magnetic member is disposed in the rigid gear assembly, and the first magnetic member and the second magnetic member form a magnetic inductive connection, so that the flexible gear assembly always has a movement tendency of meshing with the rigid gear assembly.

In a further aspect, the flexible gear assembly includes a flexible gear body and a structural retaining housing, the flexible gear body being integrally secured to the structural retaining housing by a first fastener;

the rigid gear assembly comprises a rigid gear body and a structural inner retaining shell, and the rigid gear body is fixed with the structural inner retaining shell into a whole through a second fastener;

the first fastening piece is arranged from bottom to top, and the second fastening piece is arranged from top to bottom.

In the technical scheme, a sealing gasket is arranged between the structure holding inner shell and the structure holding outer shell;

The sealing gasket is provided with an annular stress groove, and a plurality of structural reinforcing ribs are uniformly distributed in the annular stress groove.

The utility model has the beneficial effects that: through the arrangement of the first contact patterns, the contact area and the contact force between the inner wall of the flexible harmonic shaping sleeve and the wave generator can be effectively improved, the contact area and the contact force between the outer wall of the flexible harmonic shaping sleeve and the inner ring of the bearing can keep synchronous relative parts under the condition of enough contact force, relative displacement and abrasion are eliminated, and further the defect of uneven stress is eliminated, so that the ball bearing has better load expression and longer service life in practical application.

Drawings

Fig. 1 is a schematic diagram of the upper end structure of the harmonic reducer of the present utility model.

Fig. 2 is a schematic diagram of the lower end structure of the harmonic reducer of the present utility model.

Fig. 3 is a cross-sectional view and a partial enlarged view of the harmonic reducer according to the present utility model.

Fig. 4 is an exploded view of a part of the structure of the harmonic reducer of the present utility model.

Fig. 5 is a schematic structural view of a flexible harmonic shaping sleeve.

Fig. 6 is a schematic structural view of the cover plate.

Fig. 7 is a schematic structural view of a gasket seal.

In the figure: 1. a ball bearing; 101. a bearing inner ring; 1011. a transmission shaft hole; 102. a bearing outer ring; 1021. an annular groove; 103. a ball; 104. a flexible harmonic shaping sleeve; 1041. a first contact pattern; 1042. a second contact pattern; 105. a cover plate; 106. an inner groove; 2. a harmonic reducer; 201. a wave generator; 2011. fool-proof positioning groove; 2012. an annular groove; 202. a flexible gear assembly; 202a, a flexible gear body; 202b, a structure-retaining housing; 2021. anti-falling ribs; 203. a rigid gear assembly; 2031. a rigid gear body; 2032. a structural retention inner shell; 204. a gasket is arranged on the upper part; 205. a lower gasket; 2051. a positioning block; 3. clamping springs; 4. a first magnetic member; 5. a second magnetic member; 6. a first fastener; 7. a second fastener; 8. a sealing gasket; 801. an annular stress groove; 802. structural reinforcing ribs.

Detailed Description

The utility model will be further described with reference to the drawings and specific examples. It should be noted that the examples are only specific to the present utility model and are for the purpose of better understanding of the technical solutions of the present utility model to those skilled in the art, and should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, as the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used for convenience of description and simplicity of description, only as to the orientation or positional relationship shown in the drawings, and not as an indication or suggestion that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1 to 7, a ball bearing 1 includes a bearing inner ring 101, a bearing outer ring 102, and a plurality of balls 103 interposed between the bearing inner ring 101 and the bearing outer ring 102, the bearing inner ring 101 having a drive shaft hole 1011; the difference from the prior art is that the flexible harmonic shaping sleeve 104 is attached to the transmission shaft hole 1011, the inner wall of the flexible harmonic shaping sleeve 104 has a first contact pattern 1041, and the outer wall of the flexible harmonic shaping sleeve 104 has a second contact pattern 1042.

Through the arrangement of the first contact patterns 1041, the contact area and the contact force between the inner wall of the flexible harmonic shaping sleeve 104 and the wave generator 201 can be effectively improved, and the contact area and the contact force between the outer wall of the flexible harmonic shaping sleeve 104 and the bearing inner ring 101 can keep the associated parts synchronous under the condition of enough contact force, so that the relative displacement and abrasion are eliminated, and the defect of uneven stress is further eliminated, so that the ball bearing 1 has better load expression and longer service life in practical application.

The ball can form the formation of point contact when contacting with the plane, leads to the pressure of contact point very big, is unfavorable for balanced atress, easily leads to the condition emergence of deformation impaired. In order to solve the defects, the following modes are adopted: the bearing is characterized by further comprising a cover plate 105, wherein the cover plate 105 is provided with an inner groove 106, the balls 103 are at least partially positioned in the inner groove 106, the cover plate 105 shields the balls 103, and a lower gasket 205 abuts the cover plate 105 between the bearing inner ring 101 and the bearing outer ring 102. The inner groove 106 adopts radian matched with the ball 103, so that the ball 103 is in surface contact with the cover plate 105 when being matched, the contact area is greatly increased, the stress is uniformly spread, and the occurrence of the condition of compression deformation is reduced; meanwhile, the cover plate 105 can shield the balls 103, plays roles in dust prevention, water prevention and the like, and further protects the balls 103 well.

Example two

In another aspect of the present utility model, referring to fig. 1 to 4, there is provided a harmonic reducer 2, including a wave generator 201, a flexible gear assembly 202 and a rigid gear assembly 203, wherein a partial clearance fit is formed between the flexible gear assembly 202 and the rigid gear assembly 203, so that the flexible gear assembly 202 can be engaged with or disengaged from the rigid gear assembly 203; also included is a ball bearing 1 as described above, wherein the ball bearing 1 is disposed through the compliant gear assembly 202 and the wave generator 201 is disposed through the compliant harmonic shaping sleeve 104.

A more stable assembly connection structure scheme is provided, and the scheme is as follows: referring to fig. 2 to 3, an upper gasket 204 is disposed at the upper end of the flexible harmonic shaping sleeve 104, and a lower gasket 205 is disposed between the lower end of the flexible harmonic shaping sleeve 104 and the wave generator 201; an annular groove 2012 is formed in the lateral direction of the wave generator 201, a clamp spring 3 is arranged in the annular groove 2012, and the clamp spring 3 at least partially extends out of the annular groove 2012 and presses the upper gasket 204 on the flexible harmonic shaping sleeve 104; to achieve the connection of the upper spacer 204 flexible harmonic shaping sleeve 104 with the horizontal and vertical directions, ensuring the stability of the position.

The lower end of the wave generator 201 is provided with a fool-proof positioning groove 2011, the lower end of the lower gasket 205 is convexly provided with a positioning block 2051, and the positioning block 2051 is inserted into the fool-proof positioning groove 2011. The fool-proof positioning groove 2011 is matched with the positioning block 2051, so that the function of positioning and connecting the wave generator 201 and the lower gasket 205 can be directly achieved, and the function of directional indication and fool-proof can be achieved during assembly, so that the assembly is completed once.

Regarding the above technical solution, the outer wall of the bearing outer ring 102 is provided with an annular groove 1021, the inner wall of the flexible gear assembly 202 is provided with an anti-disengagement rib 2021, and the anti-disengagement rib 2021 is at least partially clamped into the annular groove 1021, so that the connection between the two is more stable and is not disengaged.

Still further, referring to fig. 3, the annular groove 1021 is provided with a first magnetic member 4, the rigid gear assembly 203 is provided with a second magnetic member 5, and the first magnetic member 4 and the second magnetic member 5 form a magnetic induction connection, so that the flexible gear assembly 202 always has a movement tendency of meshing with the rigid gear assembly 203. So that the flexible gear assembly 202 and the rigid gear assembly 203 can be immediately reengaged by the magnetic force at the moment when the flexible gear assembly 202 and the rigid gear assembly 203 are disengaged by the rotational inertia force.

The specific structure of the flexible gear assembly 202 is: referring to fig. 1 to 4, the flexible gear assembly 202 includes a flexible gear body 202a and a structure retaining housing 202b, wherein the flexible gear body 202a is fixed to the structure retaining housing 202b by a first fastener 6; the specific structure of the rigid gear assembly 203 is: the rigid gear assembly 203 includes a rigid gear body 2031 and a structural retention inner housing 2032, the rigid gear body 2031 being secured to the structural retention inner housing 2032 by a second fastener 7. Wherein, first fastener 6 from supreme setting down, second fastener 7 from last setting down to make the dispersion of fastening force more even, and make up terminal surface atress balanced about, more easy dismouting, and it is more stable after the assembly.

With respect to the above technical solution, referring to fig. 1 and 7, a sealing gasket 8 is disposed between the inner structural retaining shell 2032 and the outer structural retaining shell 202b, so as to improve sealing performance; further, the sealing gasket 8 is provided with an annular stress groove 801, flexibility and deformability are improved, and a plurality of structural reinforcing ribs 802 are uniformly distributed in the annular stress groove 801, so that structural strength is improved, and excessive deformation is prevented.

It should be noted that other technical solutions of the present utility model belong to the prior art, and are not described in detail.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the concept of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims

1. The ball bearing comprises a bearing inner ring (101), a bearing outer ring (102) and a plurality of balls (103) which are clamped between the bearing inner ring (101) and the bearing outer ring (102), wherein the bearing inner ring (101) is provided with a transmission shaft hole (1011);

The method is characterized in that: a flexible harmonic shaping sleeve (104) is attached to the transmission shaft hole (1011), a first contact pattern (1041) is formed on the inner wall of the flexible harmonic shaping sleeve (104), and a second contact pattern (1042) is formed on the outer wall of the flexible harmonic shaping sleeve (104).

2. A ball bearing according to claim 1, wherein: the bearing is characterized by further comprising a cover plate (105), wherein the cover plate (105) is provided with an inner groove (106), the balls (103) are at least partially positioned in the inner groove (106), the cover plate (105) shields the balls (103), and the lower gasket (205) abuts the cover plate (105) between the bearing inner ring (101) and the bearing outer ring (102).

3. The ball bearing of claim 2, wherein: an annular groove (1021) is formed in the outer wall of the bearing outer ring (102).

4. A ball bearing according to claim 3, wherein: the annular groove (1021) is provided with a first magnetic piece (4).

5. A harmonic reducer, comprising a wave generator (201), a flexible gear assembly (202) and a rigid gear assembly (203), wherein the flexible gear assembly (202) and the rigid gear assembly (203) form partial clearance fit, so that the flexible gear assembly (202) can be meshed with or separated from the rigid gear assembly (203); the method is characterized in that: the flexible gear assembly further comprises a ball bearing (1) as claimed in claim 4, wherein the ball bearing (1) is arranged in the flexible gear assembly (202) in a penetrating way, and the wave generator (201) is arranged in the flexible harmonic shaping sleeve (104) in a penetrating way.

6. The harmonic reducer of claim 5, wherein: an upper gasket (204) is arranged at the upper end of the flexible harmonic shaping sleeve (104), and a lower gasket (205) is arranged between the lower end of the flexible harmonic shaping sleeve (104) and the wave generator (201);

An annular groove (2012) is formed in the lateral direction of the wave generator (201), a clamp spring (3) is arranged in the annular groove (2012), and the clamp spring (3) at least partially extends out of the annular groove (2012) and presses the upper gasket (204) on the flexible harmonic shaping sleeve (104);

The lower end of the wave generator (201) is provided with a fool-proof positioning groove (2011), the lower end of the lower gasket (205) is convexly provided with a positioning block (2051), and the positioning block (2051) is inserted into the fool-proof positioning groove (2011).

7. The harmonic reducer of claim 5, wherein: the inner wall of the flexible gear assembly (202) is provided with an anti-falling rib (2021), and the anti-falling rib (2021) is at least partially clamped into the annular groove (1021).

8. The harmonic reducer of claim 5, wherein: the rigid gear assembly (203) is internally provided with a second magnetic part (5), and the first magnetic part (4) and the second magnetic part (5) form magnetic induction connection, so that the flexible gear assembly (202) always has a movement trend of meshing with the rigid gear assembly (203).

9. The harmonic reducer of claim 5, wherein: the flexible gear assembly (202) comprises a flexible gear body (202 a) and a structure retaining shell (202 b), wherein the flexible gear body (202 a) is fixed with the structure retaining shell (202 b) into a whole through a first fastener (6);

The rigid gear assembly (203) comprises a rigid gear body (2031) and a structure-retaining inner shell (2032), wherein the rigid gear body (2031) is fixed with the structure-retaining inner shell (2032) into a whole through a second fastener (7);

The first fastening piece (6) is arranged from bottom to top, and the second fastening piece (7) is arranged from top to bottom.

10. The harmonic reducer of claim 9, wherein: a sealing gasket (8) is arranged between the structure holding inner shell (2032) and the structure holding outer shell (202 b);

The sealing gasket (8) is provided with an annular stress groove (801), and a plurality of structural reinforcing ribs (802) are uniformly distributed in the annular stress groove (801).