Constant velocity universal joint

Abstract

The utility model provides a constant velocity universal joint, and belongs to the technical field of machinery. The problem that the rotatable angle of an existing starlike sleeve relative to a retainer is not large enough is solved. The constant velocity universal joint comprises a cylindrical shell, a steel ball, an annular starlike sleeve and an annular retainer, the steel ball, the annular starlike sleeve and the annular retainer are all arranged in the cylindrical shell, the retainer is arranged between the starlike sleeve and the cylindrical shell, a concave inner ball groove is formed in the outer side of the starlike sleeve, and a concave outer ball groove is correspondingly formed in the inner wall of the cylindrical shell. A window is formed in the retainer in a radial penetrating mode, the steel ball is arranged in the window, the inner side and the outer side of the steel ball extend out of the window and abut against the inner ball groove and the outer ball groove, the inner ball groove is in a long strip shape and is obliquely arranged relative to the axis of the starlike sleeve, and the outer ball groove is in a long strip shape and is obliquely arranged relative to the axis of the cylindrical shell. And a gap is formed between the outer side surface of the starlike sleeve and the inner wall of the retainer. The constant velocity universal joint has the advantage of wide application range.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a constant velocity universal joint. Background Art

[0002] In automobile transmission systems and other systems, in order to achieve power transmission between two rotating shafts whose axes do not overlap, a universal joint transmission device must be used. A universal joint transmission device is generally composed of a universal joint and a transmission shaft, and sometimes also includes an intermediate support. The universal joint is the "joint" part of the universal joint transmission device in the automobile transmission system, which allows the angle between the connected parts to change within a certain range and allows a certain range of relative telescopic movement between the connected parts.

[0003] At present, there are many types of universal joints. According to whether the universal joint has obvious elasticity in the torsion direction, the universal joint can be divided into two categories: rigid universal joint and flexible universal joint. Rigid universal joint can be divided into three types: unequal velocity universal joint, quasi-constant velocity universal joint and constant velocity universal joint. Among them, the constant velocity universal joint is a mechanism that connects two axes with non-coincident axes and transmits motion at the same angular velocity. It has the advantages of stable and reliable transmission, so it is widely used in front-wheel drive vehicles.

[0004] The constant velocity universal joint generally includes a housing, a star-shaped sleeve disposed in the housing, a retaining frame disposed between the housing and the star-shaped sleeve, and a steel ball disposed in the retaining frame and in contact with both the housing and the star-shaped sleeve.

[0005] However, in the existing constant velocity universal joint, the rotation angle of the star sleeve relative to the retaining frame is not large enough to meet the use requirements of some transmission structures. Utility Model Content

[0006] The utility model aims to solve the above problems in the prior art and proposes a constant velocity universal joint, which solves the problem that the rotation angle of the existing star sleeve relative to the retaining frame is not large enough.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A constant velocity universal joint comprises a cylindrical shell and steel balls all arranged in the cylindrical shell, a ring-shaped star sleeve and a ring-shaped retaining frame, the retaining frame is arranged between the star sleeve and the cylindrical shell, the outer side of the star sleeve has a recessed inner ball track, the inner wall of the cylindrical shell has a recessed outer ball track correspondingly, a window is radially penetrated on the retaining frame, the above-mentioned steel balls are arranged in the window, and the inner and outer sides of the steel balls both extend out of the window and abut against the inner and outer ball tracks, characterized in that the number of the steel balls, windows, inner and outer ball tracks is the same and there are at least three of them, the windows are evenly distributed on the retaining frame around the axis of the retaining frame, the inner ball track is in the shape of an elongated strip and is inclined relative to the axis of the star sleeve, the outer ball track is in the shape of an elongated strip and is inclined relative to the axis of the cylindrical shell, and there is a spacing between the outer side surface of the star sleeve and the inner wall of the retaining frame.

[0009] In the constant velocity universal joint, at least three evenly distributed steel balls are respectively against the star sleeve and the cylindrical shell to support the star sleeve, and a spacing is provided between the outer side surface of the star sleeve and the inner wall of the retaining frame. Thus, there is a larger space between the star sleeve and the retaining frame for the star sleeve to rotate and swing, which can meet the use requirements of most transmission structures and has a wide range of applications.

[0010] In the above-mentioned constant velocity universal joint, the two ends of the retainer are bent inwardly so that the cross section of the side of the retainer is in the shape of an arc, and the outer sides of the two ends of the star-shaped sleeve are concave inwardly.

[0011] In the above-mentioned constant velocity universal joint, the inner wall of the star sleeve has splines.

[0012] In the above-mentioned constant velocity universal joint, the inclined directions of two adjacent inner ball channels among the plurality of inner ball channels are opposite to each other, and the inclined directions of two adjacent outer ball channels among the plurality of outer ball channels are opposite to each other.

[0013] In the above-mentioned constant velocity universal joint, a through hole is formed in the cylindrical shell at a position deviating from the inner hole along the axial direction.

[0014] In the above-mentioned constant velocity universal joint, the inner diameter of one end of the cylindrical shell is larger than the inner diameter of the other end.

[0015] In the above-mentioned constant velocity universal joint, the end surface of the cylindrical shell has a recessed annular groove, and the outer side of the end of the cylindrical shell is also provided with an annular retaining ring, the inner diameter of the retaining ring is smaller than the inner diameter of the cylindrical shell, and one end of the retaining ring is inserted into the groove. The retaining ring is used to limit the steel ball to prevent it from falling out.

[0016] In the above-mentioned constant velocity universal joint, the cross section of the clamping groove is L-shaped, including an axial groove whose length direction is consistent with the axial direction of the cylindrical shell and a radial groove whose length direction is consistent with the radial direction of the cylindrical shell. The axial groove and the radial groove are both in annular shape. One end of the axial groove is opened to the end face of the cylindrical shell, and the radial groove is located at the other end of the axial groove and is connected with it. The radial groove is closer to the axis of the cylindrical shell than the axial groove, and the end of the retaining ring is clamped into the radial groove. The end of the retaining ring has an annular clamping portion that bends inward. After the retaining ring is inserted into the axial groove, it is pressed against the cylindrical shell, so that the clamping portion of the retaining ring is bent and deformed into the radial groove to achieve the retaining ring being clamped in the clamping groove.

[0017] Compared with the prior art, the constant velocity universal joint supports the star sleeve through at least three evenly distributed steel balls, and a spacing is provided between the outer side surface of the star sleeve and the inner wall of the retaining frame, so that there is a larger space between the star sleeve and the retaining frame for the star sleeve to rotate and swing, which can meet the use requirements of most transmission structures and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the constant velocity universal joint.

[0019] Figure 2 It is a structural schematic diagram of the cylindrical shell of the constant velocity universal joint.

[0020] In the figure, 1, cylindrical shell; 2, steel ball; 3, star-shaped sleeve; 4, retaining frame; 5, inner ball track; 6, outer ball track; 7, through hole. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 and Figure 2 As shown, the constant velocity universal joint comprises a cylindrical shell 1 in a cylindrical shape, steel balls 2 arranged in the cylindrical shell 1 , a ring-shaped star sleeve 3 and a ring-shaped retainer 4 , wherein the retainer 4 is arranged between the star sleeve 3 and the cylindrical shell 1 .

[0023] The outer side of the star-shaped sleeve 3 has an inner ballway 5 which is concave in a strip shape, and the inner ballway is tilted relative to the axis of the star-shaped sleeve 3. The inner wall of the cylindrical shell 1 has an outer ballway 6 which is concave in a strip shape, and the outer ballway 6 is tilted relative to the axis of the cylindrical shell 1. A window is radially provided on the retaining frame 4, and the steel ball 2 is arranged in the window, and both the inner and outer sides of the steel ball 2 extend out of the window and abut against the inner ballway and the outer ballway 6. In this embodiment, the number of the steel balls 2, the windows, the inner ballway and the outer ballway 6 is the same and at least three, preferably six, the windows are evenly distributed on the retaining frame 4 around the axis of the retaining frame 4, the steel balls 2, the inner ballway and the outer ballway 6 are arranged one by one, the inclination directions of any two adjacent inner ballways among the six inner ballways are opposite, and the inclination directions of any two adjacent outer ballways 6 among the six outer ballways 6 are opposite.

[0024] The two ends of the retainer 4 are bent inwards to make the cross section of the side of the retainer 4 arc-shaped, the outer surfaces of the two ends of the star sleeve 3 are concave inwards, and there is a gap between the outer side surface of the star sleeve 3 and the inner wall of the retainer 4. The inner wall of the star sleeve 3 has splines.

[0025] The inner diameter of one end of the cylindrical shell 1 is larger than the inner diameter of the other end. A through hole 7 is formed in the cylindrical shell 1 axially and deviates from the inner hole.

[0026] In addition, the end surface of the cylindrical shell 1 is provided with a recessed annular groove, and the outer side of the end of the cylindrical shell 1 is also provided with an annular retaining ring, the inner diameter of the outer end of the retaining ring is smaller than the inner diameter of the cylindrical shell 1, and the inner end of the retaining ring is inserted into the groove. In this embodiment, the cross section of the retaining groove is L-shaped, including an axial groove whose length direction is consistent with the axial direction of the cylindrical shell 1 and a radial groove whose length direction is consistent with the radial direction of the cylindrical shell 1. The axial groove and the radial groove are both annular, one end of the axial groove is opened to the end surface of the cylindrical shell 1, the radial groove is located at the other end of the axial groove and is connected with it, the radial groove is closer to the axis of the cylindrical shell 1 than the axial groove, and the end of the retaining ring is inserted into the radial groove. Here, the retaining ring is made of metal material, and the end of the inner end thereof has an inwardly bent annular clamping portion, and the inner end of the retaining ring is inserted into the axial groove and squeezed toward the cylindrical shell 1, so that the clamping portion of the retaining ring is bent and deformed in the radial groove to realize the retaining ring being clamped in the groove.

[0027] 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. A constant velocity universal joint, comprising a cylindrical shell (1), steel balls (2) arranged in the cylindrical shell (1), a star-shaped sleeve (3) in an annular shape, and a retaining frame (4) in an annular shape, wherein the retaining frame (4) is arranged between the star-shaped sleeve (3) and the cylindrical shell (1), the outer side of the star-shaped sleeve (3) has a concave inner ball track (5), and the inner wall of the cylindrical shell (1) has a corresponding concave outer ball track (6), and a window is radially penetrated on the retaining frame (4), the steel ball (2) is arranged in the window, and the inner and outer sides of the steel ball (2) both extend out of the window and abut against the inner ball track and the outer ball track (6), characterized in that: The number of the steel balls (2), windows, inner ball paths and outer ball paths (6) is the same and at least three. The windows are evenly distributed on the retaining frame (4) around the axis of the retaining frame (4). The inner ball path is in the shape of an elongated strip and is arranged obliquely relative to the axis of the star sleeve (3). The outer ball path (6) is in the shape of an elongated strip and is arranged obliquely relative to the axis of the cylindrical shell (1). There is a spacing between the outer side surface of the star sleeve (3) and the inner wall of the retaining frame (4). The end surface of the cylindrical shell (1) has a recessed annular groove. The outer side of the end of the cylindrical shell (1) is also provided with an annular retaining ring. The inner diameter of the retaining ring is smaller than the inner diameter of the cylindrical shell (1). One end of the retaining ring is inserted into the groove.

2. A constant velocity universal joint according to claim 1, characterized in that: The two ends of the retaining frame (4) are bent inwards so that the cross section of the side of the retaining frame (4) is in the shape of an arc, and the outer surfaces of the two ends of the star-shaped sleeve (3) are concave inwards.

3. A constant velocity universal joint according to claim 1 or 2, characterized in that: The inner wall of the star-shaped sleeve (3) is provided with splines.

4. A constant velocity universal joint according to claim 1 or 2, characterized in that: The inclination directions of two adjacent inner fairways among the plurality of inner fairways are opposite, and the inclination directions of two adjacent outer fairways (6) among the plurality of outer fairways (6) are opposite.

5. A constant velocity universal joint according to claim 1 or 2, characterized in that: The cylindrical shell (1) is provided with a through hole (7) axially penetrating a position deviating from the inner hole.

6. A constant velocity universal joint according to claim 1 or 2, characterized in that: The inner diameter of one end of the cylindrical shell (1) is larger than the inner diameter of the other end.

7. A constant velocity universal joint according to claim 1 or 2, characterized in that: The cross-section of the slot is L-shaped, comprising an axial slot whose length direction is consistent with the axial direction of the cylindrical shell (1) and a radial slot whose length direction is consistent with the radial direction of the cylindrical shell (1). The axial slot and the radial slot are both in annular shape. One end of the axial slot is opened to the end face of the cylindrical shell (1), and the radial slot is located at the other end of the axial slot and is connected with the cylindrical shell. The radial slot is closer to the axis of the cylindrical shell (1) than the axial slot, and the end of the retaining ring is inserted into the radial slot.

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