Inner ball cage

Abstract

The utility model provides an inner ball cage, and belongs to the technical field of machinery. The problem that oil leakage is prone to occurring after long-time use is solved. The star-shaped sleeve, the retainer and the steel balls are all arranged in the shell, the outer end of the shell is connected with a protective cover, the outer end of the protective cover is provided with a connecting part in a protruding mode, the connecting part is fixedly connected with a dustproof sleeve, the inner end of the dustproof sleeve is arranged outside the connecting part in a sleeving mode, and the outer end of the connecting part is provided with an anti-disengaging protruding shoulder expanding outwards. An anti-falling face with taper is arranged at the position, close to the inner end, of the inner side of the dustproof sleeve, the inner diameter of the anti-falling face is gradually reduced from the outer end of the dustproof sleeve to the inner end of the dustproof sleeve, the outer edge of the anti-falling protruding shoulder abuts against the anti-falling face, an annular clamping groove is formed in the outer side of the inner end of the dustproof sleeve, and an anti-falling hoop is arranged in the annular clamping groove. A plurality of annular positioning grooves are formed in the inner side of the inner end of the dustproof sleeve in the axial direction, and when the dustproof sleeve moves outwards relative to the connecting part, the anti-disengaging protruding shoulders can be partially clamped into the positioning grooves. The connecting structure has the advantages of firm connection, difficulty in oil leakage and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to an inner ball cage. Background Art

[0002] A universal joint is a component that realizes angular power transmission and is used in positions where the direction of the transmission axis needs to be changed. The inner ball cage is a type of universal joint, which includes a housing, a star-shaped sleeve and a retainer both arranged in the housing. The retainer is located between the outer wall of the star-shaped sleeve and the inner wall of the housing. The retainer has a number of steel balls evenly arranged along the circumference. The inner wall of the housing is provided with a number of inner raceways and the outer wall of the star-shaped sleeve is provided with a number of outer raceways. Each steel ball is simultaneously located in the corresponding inner raceway and outer raceway. The star-shaped sleeve is connected to the transmission shaft through the inner spline of the center hole, and swings with the help of the cooperation of the steel balls, inner raceways and outer raceways.

[0003] In actual use, an anti-oil leakage structure should be designed between the transmission shaft and the housing. For example, the internal ball cage protection structure in a drive shaft assembly disclosed in the patent application No. 201620086164.5 includes a housing, a ball cage assembly, a connecting shaft and a dustproof body. The ball cage assembly is arranged in the housing, the connecting shaft is connected to the housing, the dustproof body is installed on the housing, and an isolation fitting is also arranged between the dustproof body and the housing. The other end of the dustproof body is connected to one end of the isolation fitting, and the other end of the isolation fitting is connected to the housing. A gasket is arranged on the left end face of the housing, and a protective cover is installed on the outside of the gasket. Among them, the isolation fitting is fixed to the driving device together with the housing by bolts, and the dustproof body realizes oil leakage between the isolation fitting and the connecting shaft.

[0004] From its instruction manual Figure 1 It can be seen that there is a bent annular groove at the end of the isolation fitting. During assembly, one end of the dustproof body is inserted into the annular groove and then the isolation fitting is riveted from the end to shrink the annular groove, thereby fixing the end of the dustproof body. However, when the drive shaft assembly is working, the connecting shaft will have a telescopic movement relative to the housing, and the other end of the dustproof body is fixed to the connecting shaft by a clamp, that is, the connecting shaft has a pulling force on the dustproof body. When the dustproof body is pulled, it will act on the contracted position of the annular groove. After long-term use, it is easy to cause the contracted position of the annular groove to be squeezed open, resulting in loose connection between the dustproof body and the isolation fitting, resulting in oil leakage. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes an inner ball cage to solve the problem of oil leakage after long-term use.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] An inner ball cage comprises a shell and a star-shaped sleeve, a retaining frame and a plurality of steel balls all arranged in the shell, the outer end of the shell is connected to a protective cover, the outer end of the protective cover is protrudingly provided with a connecting portion in the shape of a circular ring column, and the connecting portion is fixedly connected with a dust cover, characterized in that the inner end of the dust cover is sleeved outside the connecting portion, the outer end of the connecting portion has an anti-slip shoulder expanding outward, the inner side of the dust cover has a tapered anti-slip surface near the inner end, the inner diameter of the anti-slip surface gradually decreases from the outer end of the dust cover toward the inner end, the outer edge of the anti-slip shoulder abuts against the anti-slip surface, the outer side of the inner end of the dust cover has an annular groove, an anti-slip clamp is arranged in the annular groove, and a plurality of annular positioning grooves are arranged on the inner side of the inner end of the dust cover along the axial direction, and when the dust cover moves outward relative to the connecting portion, the anti-slip shoulder can be partially stuck in the positioning groove.

[0008] During assembly, the inner end of the dust cover is sleeved outside the connection part, the anti-slip boss located at the outer end of the connection part abuts against the anti-slip surface inside the dust cover, and finally the anti-slip clamp is installed in the annular groove outside the inner end of the dust cover and the inner end of the dust cover is fixed to the connection part with the help of the anti-slip clamp. Since the anti-slip boss is expanded outward relative to the outer end of the connection part, and the inner diameter of the anti-slip surface is gradually reduced from the outer end of the dust cover to the inner end, this means that the more the dust cover slides outward relative to the connection part, the tighter the anti-slip boss and the anti-slip surface will fit to form a wedge-tight state, and combined with the use of the anti-slip clamp, the connection part and the dust cover can be very firmly connected together, ensuring that the protective cover and the dust cover are not easy to loosen during long-term use, thereby effectively preventing the occurrence of oil leakage.

[0009] In addition, a plurality of annular positioning grooves are axially arranged on the inner side of the inner end of the dust cover, so that even if the dust cover slides outward relative to the connecting portion, the anti-slip boss portion can be inserted into the positioning groove to form a positioning to prevent the dust cover from continuing to slide outward.

[0010] In the above-mentioned inner cage, the anti-dropping shoulder is formed by folding the outer end of the connecting part outwardly and then inwardly.

[0011] The outer end of the connecting portion is first folded outward, and then the end of the folded-outward portion is folded inward again, thereby obtaining an anti-slip shoulder. Compared with the connecting portion, the anti-slip shoulder has a greater thickness and stronger anti-deformation ability, so that when the dust cover is pulled outward relative to the connecting portion, the anti-slip shoulder is not easily squeezed and deformed.

[0012] In the above-mentioned inner ball cage, the inner side of the inner end of the dust cover also has a plurality of anti-skid flanges along the axial direction, each anti-skid flange abuts against the outer wall of the connecting part, and the above-mentioned positioning groove is formed between two adjacent anti-skid flanges.

[0013] After the anti-drop clamp is locked, each anti-slip flange will firmly press against the outer wall of the connecting part, thereby greatly increasing the friction between the dust cover and the connecting part, and further ensuring the firmness of the connection between the dust cover and the connecting part.

[0014] In the above-mentioned inner ball cage, the bottom wall of the annular groove is provided with a plurality of annular grooves along the axial direction of the dust cover, and the bottom wall of the annular groove forms anti-slip grooves between each two adjacent annular grooves.

[0015] Through the above arrangement, the friction between the anti-dropping clamp and the bottom wall of the annular clamping groove can be increased, thereby ensuring that the anti-dropping clamp is not easy to loosen.

[0016] In the above-mentioned inner cage, the inner end of the connecting portion and the outer end surface of the protective cover are in an arc transition.

[0017] The inner end of the connecting part and the outer end surface of the protective cover are in a circular arc transition, which means that there is a size change at the connection between the connecting part and the protective cover. Therefore, the connection between the connecting part and the protective cover and the anti-slip boss can cooperate to form a state in which the inner end of the dust cover is clamped, further improving the connection firmness between the dust cover and the connecting part.

[0018] Compared with the prior art, this inner ball cage has the following advantages:

[0019] 1. An outward-expanded anti-slip shoulder is provided at the outer end of the connection part, and a tapered anti-slip surface is provided inside the dust cover. A wedge-tight state is formed between the anti-slip shoulder and the anti-slip surface. At the same time, the anti-slip clamp is used, so that the connection part and the dust cover can be firmly connected together, ensuring that the protective cover and the dust cover are not easy to loosen during long-term use, thereby effectively preventing the occurrence of oil leakage;

[0020] 2. By arranging a plurality of annular positioning grooves along the axial direction on the inner side of the inner end of the dust cover, even if the dust cover slides outward relative to the connecting part, the anti-slip shoulder part can be inserted into the positioning groove to form a positioning to prevent the dust cover from continuing to slide outward;

[0021] 3. An anti-slip flange is formed between two adjacent positioning grooves. After the anti-slip clamp is locked, each anti-slip flange will firmly press against the outer wall of the connecting part to increase the friction between the dust cover and the connecting part, further ensuring the firmness of the connection between the dust cover and the connecting part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic diagram of the inner ball cage.

[0023] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0024] In the figure, 1, housing; 2, star-shaped sleeve; 3, retaining frame; 4, steel ball; 5, protective cover; 5a, connecting part; 5a1, anti-slip boss; 5b, annular embedded part; 6, dust cover; 6a, anti-slip surface; 6b, annular groove; 6c, annular groove; 6d, anti-slip pattern; 6e, positioning groove; 6f, anti-slip flange; 7, anti-slip clamp. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] like Figure 1 As shown, an inner ball cage includes a shell 1 and a star-shaped sleeve 2, a retainer 3 and a plurality of steel balls 4, all of which are arranged in the shell 1, wherein the retainer 3 is located between the outer wall of the star-shaped sleeve 2 and the inner wall of the shell 1, each steel ball 4 is arranged at the retainer 3, the inner wall of the shell 1 is provided with a plurality of inner raceways, the outer wall of the star-shaped sleeve 2 is provided with a plurality of outer raceways, and each steel ball 4 is respectively located in the corresponding outer raceway and the corresponding inner raceway. A protective cover 5 is connected to the outer end of the shell 1, and a connecting portion 5a in the shape of a circular ring column is protruded from the outer end of the protective cover 5, and a dust cover 6 is fixedly connected to the connecting portion 5a. The outer side of the outer end of the shell 1 has an annular embedding groove, and the inner end of the protective cover 5 has an annular embedding portion 5b that is inserted into the annular embedding groove.

[0027] like Figure 1 and Figure 2 As shown, the inner end of the dust cover 6 is sleeved outside the connecting portion 5a, and the inner end of the connecting portion 5a and the outer end surface of the protective cover 5 are in an arc transition. The outer end of the connecting portion 5a has an anti-slip shoulder 5a1 that expands outward, and the inner side of the dust cover 6 near the inner end has an anti-slip surface 6a, which is a conical surface and the inner diameter of the anti-slip surface 6a gradually decreases from the outer end of the dust cover 6 to the inner end, and the outer edge of the anti-slip shoulder 5a1 abuts against the anti-slip surface 6a. The connecting portion 5a and the protective cover 5 are an integrated structure, and the protective cover 5 is formed by pressing a steel plate. The anti-slip shoulder 5a1 is formed by folding the outer end of the connecting portion 5a outward and then inward. The outer side of the inner end of the dust cover 6 has an annular groove 6b, and an anti-slip clamp 7 is provided in the annular groove 6b. In this embodiment, a plurality of annular grooves 6c are formed on the bottom wall of the annular groove 6b along the axial direction of the dust cover 6, and anti-slip grooves 6d are formed on the bottom wall of the annular groove 6b between each two adjacent annular grooves 6c.

[0028] During assembly, the inner end of the dust cover 6 is put on the outside of the connecting part 5a, and the anti-slip shoulder 5a1 located at the outer end of the connecting part 5a abuts against the anti-slip surface 6a inside the dust cover 6. Finally, the anti-slip clamp 7 is installed in the annular groove 6b outside the inner end of the dust cover 6 and the inner end of the dust cover 6 is fixed to the connecting part 5a with the help of the anti-slip clamp 7. Since the anti-slip shoulder 5a1 expands outward relative to the outer end of the connection part 5a, and the inner diameter of the anti-slip surface 6a gradually decreases from the outer end to the inner end of the dust cover 6, this means that the more the dust cover 6 slides outward relative to the connection part 5a, the tighter the anti-slip shoulder 5a1 and the anti-slip surface 6a will fit together to form a wedging state, and the inner end of the connection part 5a and the outer end surface of the protective cover 5 are in a circular arc transition, which means that there is a size change at the connection between the connection part 5a and the protective cover 5, so that the inner end of the dust cover 6 can be clamped by the connection between the connection part 5a and the protective cover 5 and the anti-slip shoulder 5a1. Then, combined with the use of the anti-slip clamp 7, the connection part 5a and the dust cover 6 can be firmly connected together, ensuring that the protective cover 5 and the dust cover 6 are not easy to loosen during long-term use, thereby preventing oil leakage. Moreover, the anti-slip boss 5a1 is obtained by first folding the outer end of the connecting part 5a outward and then folding the end of this part folded outward inward. Compared with the connecting part 5a, the anti-slip boss 5a1 of this shape has an increased thickness and has a stronger anti-deformation ability. In this way, when the dust cover 6 is pulled outward relative to the connecting part 5a, the anti-slip boss 5a1 can be ensured not to be squeezed and deformed easily.

[0029] Furthermore, if Figure 2 As shown, the inner side of the inner end of the dust cover 6 is provided with a plurality of annular positioning grooves 6e along the axial direction, and the anti-slip boss 5a1 can be partially inserted into the positioning groove 6e when the dust cover 6 moves outward relative to the connecting portion 5a. By providing a plurality of annular positioning grooves 6e along the axial direction on the inner side of the inner end of the dust cover 6, even if the dust cover 6 slides outward relative to the connecting portion 5a, the anti-slip boss 5a1 can be partially inserted into the positioning groove 6e to form a positioning to prevent the dust cover 6 from continuing to slide outward. The inner side of the inner end of the dust cover 6 also has a plurality of anti-slip flanges 6f along the axial direction, each anti-slip flange 6f abuts against the outer wall of the connecting portion 5a, and the above-mentioned positioning groove 6e is formed between two adjacent anti-slip flanges 6f. After the anti-drop clamp 7 is locked, each anti-slip flange 6e will firmly press against the outer wall of the connecting part 5a, thereby greatly increasing the friction between the dust cover 6 and the connecting part 5a, and further ensuring the firmness of the connection between the dust cover 6 and the connecting part 5a.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An inner ball cage, comprising a shell (1) and a star-shaped sleeve (2), a retainer (3) and a plurality of steel balls (4) all arranged in the shell (1), wherein the outer end of the shell (1) is connected to a protective cover (5), the outer end of the protective cover (5) is protrudingly provided with a connecting portion (5a) in the shape of a circular ring column, and the connecting portion (5a) is fixedly connected to a dust cover (6), characterized in that: The inner end of the dustproof sleeve (6) is sleeved outside the connecting portion (5a), the outer end of the connecting portion (5a) has an outwardly expanding anti-slip shoulder (5a1), the inner side of the dustproof sleeve (6) near the inner end has a tapered anti-slip surface (6a), the inner diameter of the anti-slip surface (6a) gradually decreases from the outer end of the dustproof sleeve (6) toward the inner end, the outer edge of the anti-slip shoulder (5a1) abuts against the anti-slip surface (6a), the outer side of the inner end of the dustproof sleeve (6) has an annular groove (6b), an anti-slip clamp (7) is arranged in the annular groove (6b), and a plurality of annular positioning grooves (6e) are arranged on the inner side of the inner end of the dustproof sleeve (6) along the axial direction, and when the dustproof sleeve (6) moves outward relative to the connecting portion (5a), the anti-slip shoulder (5a1) can be partially inserted into the positioning groove (6e).

2. An inner ball cage according to claim 1, characterized in that: The anti-slip shoulder (5a1) is formed by folding the outer end of the connecting portion (5a) outward and then inward.

3. An inner cage according to claim 2, characterized in that: The inner end of the dust cover (6) is also provided with a plurality of anti-skid flanges (6f) along the axial direction. Each anti-skid flange (6f) abuts against the outer wall of the connecting portion (5a), and the positioning groove (6e) is formed between two adjacent anti-skid flanges (6f).

4. An inner ball cage according to claim 1, 2 or 3, characterized in that: The bottom wall of the annular groove (6b) is provided with a plurality of annular grooves (6c) along the axial direction of the dust cover (6), and the bottom wall of the annular groove (6b) is provided with anti-slip grooves (6d) between each two adjacent annular grooves (6c).

5. An inner ball cage according to claim 1, 2 or 3, characterized in that: The inner end of the connecting portion (5a) and the outer end surface of the protective cover (5) are in an arc transition.

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