Self-compensating universal joint

Abstract

The present application relates to the technical field of transmission, in particular to a self-compensating universal joint. The self-compensating universal joint comprises a ball cage assembly, a ball pin assembly, a rolling assembly and an elastic assembly. The ball cage assembly comprises a ball cage shell and a raceway. The ball pin assembly comprises a ball pin unit and a stud pin unit. The stud pin units are arranged at intervals along the circumference of the ball pin unit. One end of the stud pin unit is connected to the outer side of the ball pin unit. The end of the stud pin unit away from the ball pin unit is at least partially arranged in the corresponding raceway. The rolling assembly is sleeved on the stud pin unit. The elastic assembly is arranged in the gap between the ball pin unit and one rolling assembly. When the rolling assembly moves along the central axis of the stud pin unit, one elastic assembly drives one rolling assembly to abut against the two side surfaces of the raceway respectively. Thus, the problem of the gap between the rolling ball and the raceway when the universal joint is working is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission, in particular to a self-compensating universal joint. BACKGROUND

[0002] Universal joint is a key component for realizing variable-angle power transmission in a transmission system. Its function is to ensure reliable power transmission in the case of frequent changes in the included angle and relative position between two shafts. Universal joint is widely used in many fields such as automobiles, engineering machinery, rail transit, aerospace, ships, industrial machinery, etc. For example, in the automobile transmission system, universal joint is widely used. For the vehicle with front-mounted engine and rear-wheel drive, the universal joint transmission device is installed between the output shaft of the transmission and the input shaft of the main reducer of the drive axle. For the vehicle with front-mounted engine and front-wheel drive, the transmission shaft is omitted, and the universal joint is installed between the front axle half shaft responsible for driving and steering and the wheel. Three-ball pin universal joint is a commonly used universal joint, which has a large axial slip amount and a small slip resistance, a simple structure, a small wear, an easy axial expansion under high torque and zero speed, and a relatively simple machining process.

[0003] The three-ball pin universal joint is composed of a three-ball pin support, a roller bearing, a retainer, and a universal joint shell. When the universal joint shell rotates, it drives the three roller bearings to roll on the ball pin of the three-ball pin support. At the same time, the outer periphery of the roller bearing is usually sleeved with a ring-shaped rolling ball, which moves along the rolling groove in the universal joint shell to adapt to the angle change and axial displacement between the two shafts, realizing constant velocity transmission. There is usually a gap between the rolling ball and the rolling groove due to machining, which makes the rolling ball unable to move normally along the rolling groove. SUMMARY

[0004] To solve the problem of the gap between the rolling ball and the rolling groove in the universal joint during operation, the present application provides a self-compensating universal joint, which comprises:

[0005] A ball cage assembly, comprising a ball cage shell and a rolling groove; the rolling groove is recessed in the inner circumferential surface of the ball cage shell; a plurality of rolling grooves are arranged at intervals along the circumference of the ball cage shell;

[0006] A ball pin assembly, comprising a ball pin unit and a stud pin unit; a plurality of stud pin units are arranged at intervals along the circumference of the ball pin unit; one end of the stud pin unit is connected to the outer side of the ball pin unit; at least part of the end of the stud pin unit away from the ball pin unit is arranged in the corresponding rolling groove;

[0007] A rolling assembly, which is sleeved on the stud pin unit; one rolling assembly is in rolling connection with one rolling groove;

[0008] a plurality of elastic components are arranged in the gap between the ball pin unit and one of the rolling components; when the rolling components move along the central axis of the column pin unit, one of the elastic components drives one of the rolling components to abut against the two side surfaces of the raceway, respectively.

[0009] In some embodiments, the rolling components include rollers and balls; the balls are arranged in a ring shape; the balls are movably sleeved on the outer circumferential side of the column pin unit; a plurality of the rollers are arranged between the column pin unit and the balls; the rollers abut against the outer circumferential wall of the column pin unit and the inner circumferential wall of the balls, respectively; the elastic components are arranged in the gap between the ball pin unit and one of the balls; when the balls move along the central axis of the column pin unit, the elastic components drive the balls to abut against the two side surfaces of the raceway, respectively.

[0010] In some embodiments, the elastic components include elastic units and guide units; the guide units are movably sleeved on the column pin unit; the guide units are arranged in the gap between the ball pin unit and the balls; the rollers abut against the inner circumferential wall of the guide units and the outer circumferential wall of the column pin unit, respectively; one end of the elastic units abuts against the guide units, and the other end at least partially abuts against the ball pin unit.

[0011] In some embodiments, the guide units include a top ring plate, first guide portions, and second guide portions; the top ring plate is arranged in a ring shape; a plurality of the first guide portions and a plurality of the second guide portions are connected to the same side of the top ring plate, respectively; a plurality of the first guide portions are arranged at intervals along the circumferential direction of the top ring plate; a plurality of the second guide portions are arranged at intervals along the circumferential direction of the top ring plate;

[0012] the top ring plate is movably sleeved on the outer circumferential side of the column pin unit; the top ring plate is located in the region between the balls and the ball pin unit; the first guide portions and the second guide portions extend to the side of the ball pin unit; at least two of the first guide portions are located on opposite sides of the ball pin unit, and at least two of the second guide portions are located on opposite sides of the ball pin unit; the second guide portions are located in the region between the first guide portions and the column pin unit;

[0013] when the balls move along the central axis of the column pin unit, a plurality of the first guide portions abut against the opposite side walls of the ball pin unit, respectively, and / or a plurality of the second guide portions abut against the opposite side walls of the ball pin unit, respectively;

[0014] the rollers are located in the region between the top ring plate and the column pin unit; at least part of the rollers abut against the inner circumferential wall of the top ring plate;

[0015] The elastic unit is arranged on the outer periphery of the second guide part; one end of the elastic unit is in abutment with the top ring plate, and the other end is in abutment with the ball pin unit.

[0016] In some embodiments, the top ring plate comprises two connecting plates and two limiting plates; one connecting plate, one limiting plate, another connecting plate, and another limiting plate are connected in a ring shape.

[0017] The projection of the connecting plate along the axial direction of the column pin unit coincides with the ball pin unit;

[0018] Part of the first guide part and part of the second guide part are connected with one limiting plate respectively; another part of the first guide part and part of the second guide part are connected with another limiting plate respectively.

[0019] One end of the elastic unit is in abutment with the connecting plate and the limiting plate respectively, and the other end is in abutment with the ball pin unit partially;

[0020] The inner wall of the connecting plate is in abutment with the roller at least partially; the limiting plate is spaced apart from the roller.

[0021] In some embodiments, the connecting plate is in abutment with the ball at least partially; the limiting plate is spaced apart from the ball.

[0022] In some embodiments, the number of the first guide parts is two; the number of the second guide parts is two; two first guide parts are connected with two limiting plates respectively; two second guide parts are connected with two limiting plates respectively.

[0023] The first guide part and the second guide part are arranged in the shape of an arc plate respectively; the circle where the second guide part is located and the circle where the first guide part is located are concentric.

[0024] When the ball moves along the central axis of the column pin unit, both sides of each first guide part are in abutment with the ball pin unit respectively; both sides of each second guide part are in abutment with the ball pin unit respectively.

[0025] In some embodiments, the column pin unit comprises a column pin body, a stop ring, a first snap spring, and a first groove.

[0026] One end of the column pin body is connected with the outer side of the ball pin unit; the end of the column pin body away from the ball pin unit is arranged in the corresponding raceway at least partially;

[0027] The first groove is recessed into the outer peripheral wall of the pin body, and the first retaining spring is sleeved in the first groove; the first retaining spring protrudes from the outer peripheral wall of the pin body; the retaining ring is sleeved on the outer peripheral wall of the pin body, one side of the retaining ring abuts against the first retaining spring, and the other side abuts against the end of the ball and the roller away from the elastic component, respectively.

[0028] In some embodiments, the self-compensating universal joint includes a shaft assembly; the shaft assembly includes a shaft unit and a fastening unit; the shaft unit includes a splined shaft, a connecting shaft, and a second groove; the fastening unit includes an elastic ring and a second retaining ring;

[0029] The connecting shaft and the spline shaft are coaxially connected; the outer diameter of the spline shaft is smaller than the outer diameter of the connecting shaft; the spline shaft is connected to the inner hole of the ball pin unit via a spline.

[0030] The second groove is recessed into the outer peripheral wall of the spline shaft; the second retaining spring is sleeved in the second groove; the second retaining spring protrudes from the outer peripheral wall of the spline shaft; the second retaining spring is spaced apart from the elastic component;

[0031] The elastic ring is sleeved on the outer peripheral wall of the spline shaft; the ball pin unit is located in the area between the elastic ring and the second retaining ring; the two sides of the elastic ring abut against the ball pin unit and the connecting shaft respectively; when the ball pin assembly moves along the central axis of the ball cage shell, the elastic ring drives the ball pin unit to abut against the second retaining ring.

[0032] In some embodiments, the shaft unit further includes a mounting portion; the mounting portion is connected to the end of the spline shaft away from the connecting shaft; the mounting portion is cylindrical, and the outer diameter of the mounting portion is smaller than the outer diameter of the spline shaft.

[0033] To solve the problem of gaps between the rolling balls and raceways in universal joints during operation, this invention has the following advantages:

[0034] An elastic component is installed in the gap between the ball pin unit and the rolling component. When the universal joint rotates, the rolling component moves along the central axis of the ball pin unit. The elastic component drives the rolling component to abut against the raceway, thus eliminating the gap between the rolling component and the raceway caused by the machining. This allows the rolling component to roll normally along the raceway, thereby ensuring the normal use of the universal joint. Attached Figure Description

[0035] Figure 1 A schematic diagram of the structure of a self-compensating universal joint according to an embodiment is shown;

[0036] Figure 2 It shows Figure 1 Cross-sectional view of the ball joint assembly;

[0037] Figure 3 It shows Figure 1 A cross-sectional view of the self-compensating universal joint in the middle;

[0038] Figure 4 It shows Figure 1 Schematic diagram of the structure of the guide unit;

[0039] Figure 5 It shows Figure 3 Enlarged view of section A in the image;

[0040] Figure 6 It shows Figure 1 Sectional view of the central axis unit;

[0041] Figure 7 It shows the application to Figure 1 A cross-sectional view of the components installed in the middle;

[0042] Figure 8 A flowchart illustrating an embodiment of a self-compensating universal joint installation method is shown.

[0043] Reference numerals: 10 Ball pin assembly; 11 Ball pin unit; 111 Ball pin body; 112 Spline hole; 113 Support platform; 12 Pillar pin unit; 121 Pillar pin body; 122 First groove; 123 Retaining ring; 124 First snap ring; 20 Elastic assembly; 21 Elastic unit; 22 Guide unit; 221 Top ring plate; 2211 Connecting plate; 2212 Limiting plate; 222 First guide part; 223 Second guide part; 30 Rolling assembly; 31 Roller; 32 Ball; 40 Ball cage assembly; 41 Ball cage shell; 42 Raceway; 50 Shaft assembly; 51 Shaft unit; 511 Mounting part; 512 Splined shaft; 513 Second groove; 514 Connecting shaft; 52 Fastening unit; 521 Elastic ring; 522 Second snap ring; 60 Mounting assembly; 61 Guide part; 62 Positioning part; 63 Mounting groove. Detailed Implementation

[0044] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0045] As used herein, the term "includes" and its variants are to be read as open-ended terms that mean "including, but not limited to." The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment." The term "another embodiment" is to be read as "at least one other embodiment." The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and similar terms are used for description only and not intended to convey an intended orientation of the device, component, or element described. These terms are used primarily just to better describe the application and its embodiments and do not limit the scope of the indicated device, component, or element to a particular orientation, or to construction and operation in a particular orientation. Also, these terms can be used in connection with other terms to convey additional meaning, for example, the term "upper" can also be used in connection with the term "end" to convey a sense of proximity or connection in addition to the meaning associated with the term "upper." The specific meaning of these terms in the context of the present application will be apparent to those of ordinary skill in the art. Also, the terms "mount," "position," "provided with," "connected," "linked," are to be construed broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; or it can be internal connection between two devices, elements or components. The specific meaning of these terms in the context of the present application will be apparent to those of ordinary skill in the art. Also, the terms "first," "second," and the like are used primarily just to better describe different devices, elements or components (the specific type and configuration of which can or can not be the same) and do not imply relative importance or quantity unless otherwise stated. The meaning of "a plurality" is two or more, unless otherwise stated.

[0046] The universal joint is a key component in the transmission system to realize variable angle power transmission. Its role is to ensure reliable power transmission in the case of frequent changes in the angle and relative position between two shafts. The three-ball pin universal joint is a commonly used universal joint, which is composed of a three-ball pin bracket, a roller 31 bearing, a retainer, and a universal joint shell. Due to the possible machining error of the depth of the raceway 42 on the inner circumferential side of the universal joint shell, there may be an assembly error between the rolling ball and the roller 31 bearing which is set on the outer side of the roller 31 bearing, and the rolling ball itself may also have a machining error. In summary, when the rolling ball rolls along the raceway 42, there is usually a machining-induced gap between the rolling ball and the raceway 42, so that the rolling ball cannot normally roll along the raceway 42 when the universal joint is in use.

[0047] Embodiment one:

[0048] The application provides a self-compensating universal joint. In the embodiment, as shown in Figure 1 the self-compensating universal joint comprises a ball cage assembly 40, a ball pin assembly 10, a rolling assembly 30 and an elastic assembly 20.

[0049] As shown in Figure 1 the ball cage assembly 40 comprises a ball cage shell 41 and a raceway 42. The raceway 42 is recessed on the inner circumferential surface of the ball cage shell 41; and a plurality of raceways 42 are arranged at intervals along the circumference of the ball cage shell 41.

[0050] As shown in Figure 2 the ball pin assembly 10 comprises a ball pin unit 11 and a stud pin unit 12. The stud pin unit 12 is arranged at intervals along the circumference of the ball pin unit 11; one end of the stud pin unit 12 is connected to the outer side of the ball pin unit 11; and the end of the stud pin unit 12, which is away from the ball pin unit 11, is at least partially arranged in the corresponding raceway 42. In this way, a mounting base is provided for the rolling assembly 30 to be mounted inside the ball cage shell 41.

[0051] As shown in Figure 3 the rolling assembly 30 is sleeved on the stud pin unit 12; and as shown in Figure 1 one rolling assembly 30 is in rolling connection with one raceway 42. In this way, when the ball pin assembly 10 moves along the axial direction of the ball cage assembly 40, the friction between the rolling assembly 30 and the raceway 42 is in the form of rolling friction; and when the ball pin assembly 10 moves along a direction having a smaller angle with the axial direction of the ball cage assembly 40, the friction between the rolling assembly 30 and the raceway 42 is in the form of rolling friction, rather than only in the form of sliding friction, thereby reducing the friction loss between the rolling assembly 30 and the ball cage assembly 40.

[0052] As shown in Figure 2 and Figure 3 the elastic assembly 20 is arranged in the gap between the ball pin unit 11 and one rolling assembly 30; and when the rolling assembly 30 moves along the central axis of the stud pin unit 12, one elastic assembly 20 drives one rolling assembly 30 to abut against the two side surfaces of the raceway 42, respectively. In this way, the rolling assembly 30 is always in abutment with the raceway 42 when the self-compensating universal joint rotates, the gap between the rolling assembly 30 and the raceway 42 due to machining is eliminated, and the noise generated by the collision between the rolling assembly 30 and the raceway 42 is reduced. When the self-compensating universal joint rotates, the axis of the ball cage assembly 40 can have a small angle with the axis of the ball pin assembly 10; and since the rolling assembly 30 is always in abutment with the raceway 42, the angle change power transmission between the ball pin assembly 10 and the ball cage assembly 40 can be realized through the abutment force, thereby realizing the function of the self-compensating universal joint to transmit the angle change power after the ball pin assembly 10 and the ball cage assembly 40 are respectively connected to external structures.

[0053] When the self-compensating universal joint rotates, the elastic assembly 20 drives the rolling assembly 30 to always abut against the two side surfaces of the raceway 42, so that the ball pin assembly 10 can move along the axis of the ball pin assembly 10 in the ball cage assembly 40, and / or the angle between the axis of the ball cage assembly 40 and the axis of the ball pin assembly 10 is small, and the elastic assembly 20 can drive the rolling assembly 30 to approach or move away from the inner circumferential wall of the ball cage assembly 40 under complex working conditions through the elasticity of the elastic assembly 20, and ensure that the rolling assembly 30 always abuts against the two sides of the raceway 42, that is, the abutting force between the rolling assembly 30 and the raceway 42 has self-adaptability through the self-adaptive elastic force, so that the abutting force can remain relatively stable under complex working conditions, thereby reducing the friction between the rolling assembly 30 and the raceway 42 and reducing the wear between the rolling assembly 30 and the ball cage assembly 40.

[0054] Preferably, the small angle between the axis of the ball cage assembly 40 and the axis of the ball pin assembly 10 is less than 22°.

[0055] Further, as shown in Figure 3 the rolling assembly 30 includes the rollers 31 and the rolling balls 32. The rolling balls 32 are arranged in a ring shape; the rolling balls 32 are movably sleeved on the outer circumferential side of the pin unit 12; a plurality of rollers 31 are arranged between the pin unit 12 and the rolling balls 32; the rollers 31 abut against the outer circumferential wall of the pin unit 12 and the inner circumferential wall of the rolling balls 32, respectively; so that when the self-compensating universal joint is shaken, the rollers 31 can roll or be stationary between the outer circumferential wall of the pin unit 12 and the inner circumferential wall of the rolling balls 32, and the rolling balls 32 can roll or slide along the raceway 42. The elastic assembly 20 is arranged in the gap between the ball pin unit 11 and one of the rolling balls 32; when the rolling ball 32 moves along the central axis of the pin unit 12, the elastic assembly 20 drives the rolling ball 32 to abut against the two side surfaces of the raceway 42, respectively.

[0056] Further, as shown in Figure 2 the elastic assembly 20 includes the elastic unit 21 and the guide unit 22. The guide unit 22 is movably sleeved on the pin unit 12; the guide unit 22 is arranged in the gap between the ball pin unit 11 and the rolling ball 32; the rollers 31 abut against the inner circumferential wall of the guide unit 22 and the outer circumferential wall of the pin unit 12, respectively; one end of the elastic unit 21 abuts against the guide unit 22, and the other end at least partially abuts against the ball pin unit 11. In this way, the ball pin unit 11, the elastic unit 21, the guide unit 22 and the rolling ball 32 are sequentially connected, and the guide unit 22 and the rolling ball 32 are sleeved on the outer circumferential wall of the roller 31. The elastic unit 21 can be a compression spring, so that the guide unit 22 provides a guide function for the expansion and contraction of the compression spring on the pin unit 12, avoiding deformation or even falling out of the compression spring from the pin unit 12 after long-term use.

[0057] Further, as shown in Figure 4As shown, the guide unit 22 comprises a top ring plate 221, a first guide part 222, and a second guide part 223; the top ring plate 221 is arranged in a ring shape; the first guide part 222 and the second guide part 223 are connected to the same side of the top ring plate 221; the first guide part 222 is arranged along the circumferential direction of the top ring plate 221; the second guide part 223 is arranged along the circumferential direction of the top ring plate 221;

[0058] The top ring plate 221 is movably sleeved on the outer circumferential side of the pin unit 12; the top ring plate 221 is located in the region between the ball 32 and the ball pin unit 11; the first guide part 222 and the second guide part 223 extend to the side of the ball pin unit 11; at least two first guide parts 222 are located on opposite sides of the ball pin unit 11, and at least two second guide parts 223 are located on opposite sides of the ball pin unit 11; the second guide part 223 is located in the region between the first guide part 222 and the pin unit 12;

[0059] When the ball 32 moves along the central axis of the pin unit 12, the first guide part 222 abuts against the opposite side walls of the ball pin unit 11, and / or the second guide part 223 abuts against the opposite side walls of the ball pin unit 11; the roller 31 is located in the region between the top ring plate 221 and the pin unit 12; at least part of the roller 31 abuts against the inner circumferential wall of the top ring plate 221; in this way, the guide unit 22 can be installed between the ball pin unit 11 and the roller 31, and sleeved on the outer circumferential side of part of the roller 31, so that the guide unit 22 can only move in the axial direction of the pin unit 12, and so that the elastic unit 21 avoids the guide unit 22 rotating around the axis of the pin unit 12 when driving the guide unit 22 to move in the axial direction of the pin unit 12.

[0060] The elastic unit 21 is sleeved on the outer circumferential side of the second guide part 223; the elastic unit 21 is located in the gap between the first guide part 222 and the second guide part 223; one end of the elastic unit 21 abuts against the top ring plate 221, and the other end abuts against the ball pin unit 11. In this way, at least part of the elastic unit 21 can be restricted between the first guide part 222 and the second guide part 223, and the deformation of the elastic unit 21 in the axial direction of the pin unit 12 is further restricted by the guide unit 22, so that the elastic unit 21 will not deviate from the axial deformation after the self-compensating universal joint is vibrated for a long time, and the service life of the elastic unit 21 is prolonged.

[0061] Further, as shown, Figure 4 The top ring plate 221 comprises two connecting plates 2211 and two limiting plates 2212; one connecting plate 2211, one limiting plate 2212, another connecting plate 2211, and another limiting plate 2212 are connected in a ring shape;

[0062] The projection of the connecting plate 2211 in the axial direction of the pin unit 12 coincides with the ball pin unit 11.

[0063] Part of the first guide part 222 and part of the second guide part 223 are connected with one limit plate 2212 respectively; another part of the first guide part 222 and part of the second guide part 223 are connected with another limit plate 2212 respectively;

[0064] One end of the elastic unit 21 is respectively abutted with the connecting plate 2211 and the limit plate 2212, and the other end is partially abutted with the ball pin unit 11;

[0065] The inner wall of the connecting plate 2211 is at least partially abutted with the roller 31; thus the guide unit 22 can be limited to translate along the direction of the line of the two connecting plates 2211. The limit plate 2212 is spaced apart from the roller 31; thus the friction between the other part of the top ring plate 221, i.e. the limit plate 2212 and the roller 31 can be reduced.

[0066] Further, referring to Figure 2 and Figure 4 The connecting plate 2211 is at least partially abutted with the rolling ball 32; thus the elastic force of the elastic unit 21 can be transmitted to the rolling ball 32 only through the connecting plate 2211. Since the rolling ball 32 will slide with the top ring plate 221 when rolling, the limit plate 2212 is spaced apart from the rolling ball 32; thus only the connecting plate 2211 of the top ring plate 221 can be in friction with the rolling ball 32, so as to reduce the friction between the top ring plate 221 and the rolling ball 32.

[0067] Further, as shown in Figure 4 , the number of the first guide part 222 is two; the number of the second guide part 223 is two; the two first guide parts 222 are respectively connected with the two limit plates 2212; the two second guide parts 223 are respectively connected with the two limit plates 2212;

[0068] The first guide part 222 and the second guide part 223 are respectively arranged in the shape of arc plate; the circle where the second guide part 223 is located is concentric with the circle where the first guide part 222 is located. Compared with the case that the first guide part 222 and the second guide part 223 are arranged in the shape of column, the first guide part 222 and the second guide part 223 arranged in the shape of arc plate can have larger area for cooperation with the elastic unit 21, and the first guide part 222 and the second guide part 223 have higher strength.

[0069] When the ball 32 moves along the central axis of the pin unit 12, the two sides of each first guide part 222 are respectively in abutment with the ball pin unit 11; the two sides of each second guide part 223 are respectively in abutment with the ball pin unit 11. In this way, one limiting plate 2212 can be arranged on the two sides of the ball pin unit 11, and one limiting plate 2212 is correspondingly arranged in the shape of an arc plate as one first guide part 222 and one second guide part 223, and since the circle where the second guide part 223 is located is concentric with the circle where the first guide part 222 is located, the limiting effect of the limiting plates 2212 on the two sides on the elastic unit 21 is the same and symmetric about the center.

[0070] Further, as shown in Figure 5 , the pin unit 12 includes a pin body 121, a retaining ring 123, a first clamp spring 124, and a first groove 122.

[0071] One end of the pin body 121 is connected to the outside of the ball pin unit 11, and the other end of the pin body 121 away from the ball pin unit 11 is at least partially arranged in the corresponding raceway 42;

[0072] The first groove 122 is recessed in the outer peripheral wall of the pin body 121, and the first clamp spring 124 is sleeved on the first groove 122; the first clamp spring 124 protrudes from the outer peripheral wall of the pin body 121; the retaining ring 123 is sleeved on the outer peripheral wall of the pin body 121, one side of the retaining ring 123 is in abutment with the first clamp spring 124, and the other side is in abutment with the ball 32 and the roller 31 away from the elastic assembly 20. In this way, the retaining ring 123 is installed on the side of the first clamp spring 124 close to the ball pin unit 11 through the first clamp spring 124 sleeved on the first groove 122, so that the ball 32 and the roller 31 are blocked on the side of the retaining ring 123 close to the ball pin unit 11 through the retaining ring 123, thereby avoiding excessive displacement of the ball 32 under the abutment of the elastic unit 21.

[0073] Further, referring to Figure 3 and Figure 6 , the self-compensating universal joint includes a shaft assembly 50. The shaft assembly 50 includes a shaft unit 51 and a fastening unit 52; the shaft unit 51 includes a spline shaft 512, a connecting shaft 514, and a second groove 513; the fastening unit 52 includes an elastic ring 521 and a second clamp spring 522.

[0074] The connecting shaft 514 and the spline shaft 512 are coaxially connected; the outer diameter of the spline shaft 512 is smaller than the outer diameter of the connecting shaft 514; the spline shaft 512 is connected to the inner hole of the ball pin unit 11 through spline connection;

[0075] The second groove 513 is recessed in the outer peripheral wall of the spline shaft 512; the second clamp spring 522 is sleeved on the second groove 513; the second clamp spring 522 protrudes from the outer peripheral wall of the spline shaft 512; and the second clamp spring 522 is spaced from the elastic assembly 20.

[0076] The elastic ring 521 is sleeved on the outer peripheral wall of the spline shaft 512; the ball pin unit 11 is located in the region between the elastic ring 521 and the second snap spring 522; the two sides of the elastic ring 521 are respectively in abutment with the ball pin unit 11 and the connecting shaft 514; when the ball pin assembly 10 moves along the central axis of the ball cage shell 41, the elastic ring 521 drives the ball pin unit 11 to abut against the second snap spring 522. In this way, the displacement of the ball pin unit 11 on the spline shaft 512 can be limited by the second snap spring 522 sleeved on the second groove 513 and the elastic ring 521 abutting against the ball pin unit 11 and the connecting shaft 514 respectively. Since the elastic ring 521 is elastic and drives the ball pin unit 11 to abut against the second snap spring 522, the ball pin unit 11 can always abut against the second snap spring 522 when the self-compensating universal joint rotates and vibrates, thereby limiting the movement of the ball pin assembly 10 on the spline shaft 512 and avoiding the problem that the ball pin assembly 10 and the connecting shaft 514 are damaged due to collision in the case of rigid connection.

[0077] Further, as shown in Figure 3 , the shaft unit 51 further comprises a mounting portion 511. The mounting portion 511 is connected to the end of the spline shaft 512 away from the connecting shaft 514; the mounting portion 511 is in a cylindrical shape, and the outer diameter of the mounting portion 511 is smaller than the outer diameter of the spline shaft 512.

[0078] In other embodiments, as shown in Figure 7 , the mounting assembly 60 comprises a guide portion 61, a positioning portion 62, and a mounting groove 63. The mounting assembly 60 can be used to install the second snap spring 522 into the second groove 513 and abut against the ball pin unit 11. One side of the guide portion 61 is connected to one side of the positioning portion 62. The mounting groove 63 is recessed on the side of the positioning portion 62 away from the guide portion 61; the shape of the mounting groove 63 is adapted to the mounting portion 511; before installing the second snap spring 522, the positioning portion 62 is installed on the outer peripheral side of the mounting portion 511 through the mounting groove 63; the outer diameter of the positioning portion 62 is equal to the outer diameter of the spline shaft 512. The outer diameter of the guide portion 61 gradually decreases in the direction away from the positioning portion 62. In this way, after the second snap spring 522 is abutted on the outer peripheral side of the guide portion 61, the second snap spring 522 is pushed along the guide portion 61 and close to the positioning portion 62, at this time the diameter of the second snap spring 522 is gradually expanded, until the second snap spring 522 is sleeved on the outer peripheral side of the positioning portion 62, and then the second snap spring 522 is continuously pushed in the direction close to the ball pin unit 11 until the second snap spring 522 enters the second groove 513 and abuts against the ball pin unit 11, completing the installation of the second snap spring 522.

[0079] In other embodiments, as shown in Figure 2As shown, the inner hole of the ball pin unit 11 is provided as a spline hole 112, the ball pin unit 11 comprises a ball pin body 111, the spline hole 112, and a support platform 113. The spline hole 112 penetrates the ball pin body 111 along the axis direction of the ball cage shell 41; a plurality of support platforms 113 are connected to the outer side wall of the ball pin body 111 along the circumferential direction of the ball pin body 111; the spline shaft 512 is spline-connected with the spline hole 112;

[0080] One end of the pin unit 12 is connected with the support platform 113; the elastic assembly 20 is arranged in the gap between the support platform 113 and the rolling ball 32; one end of the elastic assembly 20 is in abutment with the rolling assembly 30, and the other end is at least partially in abutment with the support platform 113. In this way, positioning and support for the installation of the pin unit 12 on the outer circumferential wall of the ball pin unit 11 can be provided.

[0081] Embodiment two:

[0082] The application also provides a mounting method of the self-compensating universal joint, which is applied to any self-compensating universal joint in the embodiment one. The self-compensating universal joint further comprises a shaft assembly 50; the shaft assembly 50 comprises a shaft unit 51, a fastening unit 52, and a mounting portion 511; the shaft unit 51 comprises a spline shaft 512, a connecting shaft 514, and a second groove 513; the fastening unit 52 comprises an elastic ring 521 and a second snap spring 522; as shown, Figure 8 The mounting method of the self-compensating universal joint comprises steps S10 to S30, which are specifically described as follows:

[0083] Step S10: sequentially and sleevingly mounting the elastic assembly 20 and the rolling assembly 30 on the outer circumferential side of the pin unit 12 of the ball pin assembly 10;

[0084] Step S20: sleeving the elastic ring 521 on the spline shaft 512; inserting the spline shaft 512 into one end of the inner hole of the ball pin, so that the spline shaft 512 extends out from the other end of the inner hole of the ball pin; mounting the mounting assembly 60 on the mounting portion 511 through the mounting groove 63; sleeving the second snap spring 522 on the guide portion 61, and pushing the second snap spring 522 towards the second groove 513 until the second snap spring 522 is sleeved on the second groove 513, so that the second snap spring 522 limits the ball pin unit 11 in cooperation with the elastic ring 521. In this way, the mounting step of the second snap spring 522 can be simplified and the installation efficiency can be improved through the mounting assembly 60.

[0085] Step S30: disassembling the mounting assembly 60, and mounting the ball pin assembly 10 into the ball cage shell 41, so that the rolling assembly 30 is in abutment with the raceway 42.

[0086] Those skilled in the art can understand that the above-mentioned embodiments are specific cases for implementing the present disclosure, and in actual application, various changes can be made in form and details without departing from the scope of the present disclosure.

Claims

1. A self-compensating universal joint, characterized in that, The self-compensating universal joint includes: A ball cage assembly includes a ball cage shell and raceways; the raceways are recessed on the inner circumferential surface of the ball cage shell; a plurality of raceways are spaced apart circumferentially along the ball cage shell. A ball pin assembly, comprising ball pin units and column pin units; a plurality of column pin units are arranged at circumferential intervals along the ball pin units; one end of each column pin unit is connected to the outside of the ball pin unit; at least part of the end of each column pin unit away from the ball pin unit is disposed within the corresponding raceway; A rolling assembly is sleeved on the pin unit; one rolling assembly is tactilely connected to one raceway. An elastic component is disposed in the gap between the ball pin unit and the rolling component; when the rolling component moves along the central axis of the ball pin unit, one of the elastic components drives one of the rolling components to abut against the two sides of the raceway respectively. The rolling assembly includes rollers and balls; the balls are arranged in a ring shape; the balls are movably sleeved on the outer periphery of the pin unit; a plurality of rollers are disposed between the pin unit and the balls; the rollers abut against the outer peripheral wall of the pin unit and the inner peripheral wall of the balls, respectively; an elastic component is disposed in the gap between the pin unit and one ball; when the balls move along the central axis of the pin unit, the elastic component drives the balls to abut against the two sides of the raceway, respectively; The elastic component includes an elastic unit and a guide unit; the guide unit is movably sleeved on the pin unit; the guide unit is disposed in the gap between the ball pin unit and the rolling ball; the rollers abut against the inner peripheral wall of the guide unit and the outer peripheral wall of the pin unit respectively; one end of the elastic unit abuts against the guide unit, and the other end at least partially abuts against the ball pin unit.

2. The self-compensating universal joint according to claim 1, characterized in that, The guiding unit includes a top ring plate, a first guiding portion, and a second guiding portion; the top ring plate is arranged in a ring shape; a plurality of first guiding portions and a plurality of second guiding portions are respectively connected to the same side of the top ring plate; a plurality of first guiding portions are spaced apart along the circumference of the top ring plate; a plurality of second guiding portions are spaced apart along the circumference of the top ring plate. The top ring plate is movably sleeved on the outer periphery of the pin unit; the top ring plate is located in the area between the ball and the pin unit; the first guide portion and the second guide portion extend to the side of the pin unit; at least two first guide portions are located on opposite sides of the pin unit, and at least two second guide portions are located on opposite sides of the pin unit; the second guide portions are located in the area between the first guide portions and the pin unit. When the ball moves along the central axis of the pin unit, a plurality of first guide portions abut against the opposite side walls of the pin unit, and / or a plurality of second guide portions abut against the opposite side walls of the pin unit. The roller is located in the area between the top ring plate and the pin unit; at least a portion of the roller abuts against the inner peripheral wall of the top ring plate; The elastic unit is sleeved on the outer periphery of the second guide portion; the elastic unit is located in the gap between the first guide portion and the second guide portion; one end of the elastic unit abuts against the top ring plate, and the other end abuts against the ball pin unit.

3. A self-compensating universal joint according to claim 2, characterized in that, The top ring plate includes two connecting plates and two limiting plates; one connecting plate, one limiting plate, and the other connecting plate and the other limiting plate are connected to form a ring; The projection of the connecting plate along the axial direction of the pin unit coincides with that of the ball pin unit; A portion of the first guide portion and a portion of the second guide portion are each connected to one of the limiting plates; another portion of the first guide portion and a portion of the second guide portion are each connected to another limiting plate. One end of the elastic unit abuts against the connecting plate and the limiting plate respectively, and the other end partially abuts against the ball pin unit; The connecting plate has at least a portion of its inner sidewall in contact with the roller; the limiting plate is spaced apart from the roller.

4. A self-compensating universal joint according to claim 3, characterized in that, The connecting plate at least partially abuts against the rolling ball; the limiting plate is spaced apart from the rolling ball.

5. A self-compensating universal joint according to claim 4, characterized in that, The number of first guide portions is two; the number of second guide portions is two; the two first guide portions are respectively connected to the two limiting plates; the two second guide portions are respectively connected to the two limiting plates. The first guide portion and the second guide portion are respectively configured as arc-shaped plates; the circle containing the second guide portion is concentric with the circle containing the first guide portion; As the ball moves along the central axis of the pin unit, both sides of each first guide portion abut against the pin unit; both sides of each second guide portion abut against the pin unit.

6. A self-compensating universal joint according to claim 4, characterized in that, The pin unit includes a pin body, a retaining ring, a first retaining spring, and a first groove; One end of the pin body is connected to the outside of the ball pin unit; at least part of the end of the pin body away from the ball pin unit is disposed within the corresponding raceway. The first groove is recessed into the outer peripheral wall of the pin body, and the first retaining spring is sleeved in the first groove; the first retaining spring protrudes from the outer peripheral wall of the pin body; the retaining ring is sleeved on the outer peripheral wall of the pin body, one side of the retaining ring abuts against the first retaining spring, and the other side abuts against the end of the ball and the roller away from the elastic component, respectively.

7. A self-compensating universal joint according to claim 1, characterized in that, The self-compensating universal joint includes a shaft assembly; the shaft assembly includes a shaft unit and a fastening unit; the shaft unit includes a splined shaft, a connecting shaft, and a second groove; the fastening unit includes an elastic ring and a second retaining ring; The connecting shaft and the spline shaft are coaxially connected; the outer diameter of the spline shaft is smaller than the outer diameter of the connecting shaft; the spline shaft is connected to the inner hole of the ball pin unit via a spline. The second groove is recessed into the outer peripheral wall of the spline shaft; the second retaining spring is sleeved in the second groove; the second retaining spring protrudes from the outer peripheral wall of the spline shaft; the second retaining spring is spaced apart from the elastic component; The elastic ring is sleeved on the outer peripheral wall of the spline shaft; the ball pin unit is located in the area between the elastic ring and the second retaining ring; the two sides of the elastic ring abut against the ball pin unit and the connecting shaft respectively; when the ball pin assembly moves along the central axis of the ball cage shell, the elastic ring drives the ball pin unit to abut against the second retaining ring.

8. A self-compensating universal joint according to claim 7, characterized in that, The shaft unit further includes a mounting part; the mounting part is connected to the end of the spline shaft away from the connecting shaft; the mounting part is cylindrical, and the outer diameter of the mounting part is smaller than the outer diameter of the spline shaft.

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