A long service life universal joint and a coupling comprising the same

Abstract

The application discloses a long-service-life universal joint, which comprises a cross shaft, two yokes, four bearing assemblies, a bearing hole of an end yoke arm of each of the two yokes is provided with one of the bearing assemblies, each of the bearing assemblies comprises a bearing, a snap ring, a sealing ring and an end cover, the snap ring, the sealing ring and the end cover are arranged on an outer side of the bearing, the end cover is connected with the bearing through bolts, the bearing outer ring of the bearing is in interference fit with the bearing hole of the yoke, and an anti-rotation device is arranged between the bearing and the yoke to limit the rotation of the bearing outer ring. The universal joint is provided with the anti-rotation device, so that the rotation of the bearing outer ring in clockwise and counterclockwise directions can be effectively limited in the case that the interference fit of the bearing outer ring is invalid, and the service life of the universal joint is prolonged. Meanwhile, the anti-rotation device is arranged at a position where the yoke is subjected to the least force, and the strength of the yoke is not affected.

Description

Technical Field

[0001] This invention belongs to the field of coupling technology and relates to a limiting device and method for the outer ring of a universal joint bearing. Background Technology

[0002] Couplings are used to transmit power and motion and are common industrial products. The universal joint is the core component of the coupling that realizes tilting and swinging. It is assembled from two forks at both ends and a cross bearing assembly in the middle. The reliability of the assembly and fit between the cross bearing and the bearing hole of the fork directly affects the transmission accuracy and service life of the coupling, and thus affects the quality of rolled steel.

[0003] from Figure 1 It is known that the universal joint cross bearing and the fork bearing bore are fitted with a small interference fit. Under alternating loads, the fork bearing bore undergoes periodic elastic deformation. In the middle and later stages of the universal joint's lifespan, under long-term alternating loads, the fork bearing bore is highly susceptible to fatigue and plastic deformation, directly leading to the failure of the original interference fit. This causes the outer ring of the cross bearing to rotate, resulting in the universal joint failing to reach its expected lifespan and being prematurely removed from production. Furthermore, if the rotation of the bearing outer ring is not detected in time, the universal joint will quickly fail, leading to abnormal shutdowns in the rolling mill. Summary of the Invention

[0004] This invention provides a universal joint with a long service life. By incorporating an anti-rotation device, it effectively restricts the rotation of the bearing outer ring in both clockwise and counterclockwise directions in the event of interference fit failure, thereby extending the service life of the universal joint. Simultaneously, the anti-rotation device is positioned at the point of least stress on the fork head, without affecting the strength of the fork head. Furthermore, this invention also provides a coupling incorporating the aforementioned universal joint.

[0005] This invention discloses a universal joint with a long service life, comprising a cross shaft, two forks, and four bearing assemblies. Each of the four shaft ends of the cross shaft is connected to a bearing assembly between the bearing holes of the two fork arms at both ends. Each bearing assembly includes a bearing, a retaining ring, a sealing ring, and an end cap. The retaining ring, sealing ring, and end cap are mounted on the outer side of the bearing, and the end cap is connected to the bearing by bolts. The outer ring of the bearing is interference-fitted with the bearing hole of the fork. An anti-rotation device is provided between the bearing and the fork to restrict the rotation of the outer ring of the bearing.

[0006] When the anti-rotation device is a fork head top limiting device, it includes two limiting units set above the bearing hole. The two limiting units are symmetrically arranged front and rear with respect to the center line of the fork head arm. Each limiting unit includes an inner set screw, an outer set screw, and sealant. The fork head has an outer threaded hole and an inner threaded hole machined above the bearing hole. The two threaded holes are coaxial. The outer circle of the bearing outer ring corresponding to the two inner threaded holes is machined into a plane. The inner set screw is screwed into the inner threaded hole and pressed on the plane. The outer set screw is screwed into the outer threaded hole and presses against the inner set screw. The sealant is filled on the outside of the outer set screw.

[0007] Furthermore, the internal set screw has a countersunk hole at one end and a spherical boss at the other end; the external set screw has a countersunk hole at one end and a cylindrical boss at the other end.

[0008] Furthermore, the diameter of the external threaded hole is larger than that of the internal threaded hole, and the distance between the end of the thread of the external threaded hole and the beginning of the thread of the internal threaded hole is about 5 to 10 mm.

[0009] When the anti-rotation device is a bearing outer ring outer end face limiting device, it includes a limiting plate and a set screw; the outer end face of the bearing outer ring is provided with an open groove, the bottom of the open groove is provided with a screw hole, the bottom of the bearing hole retaining ring groove is provided with a deep groove, the limiting plate is provided with a hole at the position corresponding to the screw hole, the upper part of the hole is embedded in the open groove, and the lower part passes through the notch of the retaining ring and is inserted into the deep groove. The set screw passes through the end cover and the limiting plate and then screws into the screw hole.

[0010] Furthermore, the two sides of the limiting plate are fitted to the two sides of the opening groove and the deep groove.

[0011] Furthermore, the width of both the opening groove and the deep groove is the same, and smaller than the notch width after the retaining ring is assembled.

[0012] When the anti-rotation device is a bearing outer ring inner hole limiting device, it includes a limiting block and a screw; an opening groove is provided below the inner end of the bearing hole, and a screw hole is provided at the bottom of the opening groove; the lower part of the outer circle of the bearing outer ring corresponding to the opening groove is machined into a flat surface to form an L-groove; the limiting block is placed on the opening groove; and the screw engages with the screw hole to fix the limiting block on the opening groove.

[0013] Furthermore, the right end face of the limiting block fits into the right end face of the opening groove, while leaving a gap with the right end face of the L groove.

[0014] The present invention provides a coupling comprising two universal joints on the left and right and a connecting shaft assembly in the middle.

[0015] The advantages of this universal joint are: 1. It provides three different anti-rotation devices. In the event of interference fit failure of the bearing outer ring, all three devices can effectively limit the rotation of the bearing outer ring in both clockwise and counterclockwise directions, thereby ensuring stable and reliable operation of the universal joint throughout its lifespan, extending its service life, and guaranteeing normal steel rolling production; the three devices offer multiple options, and any one can be selected. 2. The fork head top limiting device restricts rotation from above the bearing outer ring, with the external threaded hole, internal threaded hole, and flat groove all located at the top of the fork head, minimizing the force on the fork head. The bearing outer ring outer end face limiting device restricts rotation from the outer end face of the bearing outer ring. The deep groove is located at the bottom of the bearing hole retainer groove, which is the position where the fork head experiences the least force, and does not affect the strength. The bearing outer ring inner hole limiting device restricts rotation from the bottom surface of the inner side of the bearing outer ring. The open groove is located at the lower end of the inner side of the fork head bearing hole, which is the position where the fork head experiences the least force, and does not affect the strength. All three anti-rotation devices can effectively limit the rotation of the bearing outer ring in both clockwise and counterclockwise directions, and are all located at the position where the fork head experiences the least force, and do not affect the strength of the fork head. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly of the bearing and the fork in a universal joint in the background art;

[0017] Figure 2 This is a schematic diagram of the assembly of the bearing and the fork head when the anti-rotation device in the universal joint of the present invention is a fork head top limiting device;

[0018] Figure 3 for Figure 2 The right view;

[0019] Figure 4 This is a schematic diagram of the bearing hole in the fork head top limiting device;

[0020] Figure 5 for Figure 4 The right view;

[0021] Figure 6 This is a schematic diagram of an internal set screw;

[0022] Figure 7 This is a schematic diagram of an external set screw;

[0023] Figure 8 This is a schematic diagram of the assembly of the bearing and the fork head when the anti-rotation device in the universal joint of the present invention is a bearing outer ring outer end face limiting device.

[0024] Figure 9 for Figure 8 The right view;

[0025] Figure 10This is a schematic diagram of the assembly of the bearing and the fork head when the anti-rotation device in the universal joint of the present invention is a bearing outer ring inner hole limiting device.

[0026] Figure 11 for Figure 10 Enlarged view of point A in the middle;

[0027] Figure 12 for Figure 11 The left view;

[0028] Figure 13 This is a schematic diagram of the universal joint of the present invention;

[0029] Figure 14 This is a schematic diagram of the coupling of the present invention. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be implemented and various changes may be made to the invention without departing from its spirit and scope. The more detailed description of embodiments of the invention below is not intended to limit the scope of the claimed invention, but is merely illustrative and does not limit the description of the features and characteristics of the invention, in order to suggest the best mode for carrying out the invention and to enable those skilled in the art to practice it. Therefore, the scope of the invention is defined only by the appended claims.

[0031] Example 1

[0032] from Figure 2 , Figure 8 , Figure 10 , Figure 13 As can be seen, the present invention provides a universal joint with a long service life, which includes a cross shaft 9, two forks 2, and four bearing assemblies. Each of the four shaft ends of the cross shaft 9 is provided with a bearing assembly between the bearing holes of the two fork arms at both ends of the two forks 2. Each bearing assembly includes a bearing 1, a retaining ring 3, a sealing ring 4, and an end cap 5. The retaining ring 3, the sealing ring 4, and the end cap 5 are installed on the outside of the bearing 1. The end cap 5 is connected to the bearing 1 by bolts. The outer ring 101 of the bearing 1 is interference-fitted with the bearing hole 201 of the fork 2. An anti-rotation device is provided between the bearing 1 and the fork 2 to limit the rotation of the outer ring 101 of the bearing.

[0033] The universal joint of this invention: By setting an anti-rotation device between the bearing 1 and the fork 2, the rotation of the outer ring 101 of the bearing is restricted; in the case of interference fit failure in the middle and late stages of the universal joint's life cycle, the rotation of the outer ring of the bearing can be effectively restricted, thereby ensuring the stable and reliable operation of the universal joint within its life cycle, extending the service life of the universal joint, and ensuring the normal production of steel rolling.

[0034] Example 2

[0035] from Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 It is understood that the present invention provides a universal joint with a long service life: when the anti-rotation device is the fork head top limiting device 6, it includes two limiting units set above the bearing hole 201. The two limiting units are symmetrically arranged front and back with respect to the center line of the fork head 2 fork arm. Each limiting unit includes an inner set screw 601, an outer set screw 602, and sealant 603. The fork head 2 has an outer threaded hole 202 and an inner threaded hole 203 machined above the bearing hole 201. The two threaded holes are coaxial. The outer circle of the bearing outer ring 101 corresponding to the two inner threaded holes 203 is machined into a plane 1011. The inner set screw 601 is screwed into the inner threaded hole 203 and pressed on the plane 1011. The outer set screw 602 is screwed into the outer threaded hole 202 and presses against the inner set screw 601. The sealant 603 is filled on the outside of the outer set screw 602.

[0036] In the fork head top limiting device 6: each fork head 2 has two sets of inner and outer paired set screws above the two bearing holes 201. The two inner set screws 601 abut against both ends of the plane 1011, and the outer set screws 602 can effectively prevent the inner set screws 601 from loosening. In this way, in the event of interference fit failure between the cross bearing and the fork head bearing hole, the two symmetrically arranged radial limiting units can effectively limit the rotation of the bearing outer ring 101 in both clockwise and counterclockwise directions, thereby ensuring the stable and reliable operation of the universal joint throughout its life cycle, extending the service life of the universal joint, and ensuring the normal production of steel rolling.

[0037] Since the bearing outer ring and the fork bearing bore are interference-fitted, it is difficult to ensure that the limiting plane 1011 of the bearing outer ring and the inner set screw 601 are perfectly perpendicular. When they are not perfectly perpendicular, two symmetrically distributed limiting units can accommodate this assembly error and effectively restrict the rotation of the bearing outer ring 101 in both clockwise and counterclockwise directions. Of course, if the limiting plane 1011 of the bearing outer ring and the inner set screw 601 can be guaranteed to be perfectly perpendicular, a limiting unit can be placed above the bearing bore 201. The center of this limiting unit coincides with the centerline of the fork arm of the fork head 2, which can effectively restrict the rotation of the bearing outer ring 101 in both clockwise and counterclockwise directions.

[0038] When installing the fork top limiting device 6: the inner set screw 601 and the outer set screw 602 are sequentially inserted into the inner threaded hole 203 and the outer threaded hole 202 above the bearing hole 201, respectively. The inner set screw 601 abuts against the plane 1011, and the outer set screw 602 abuts against the inner set screw 601. The outer sides are filled with sealant 603. The sealant 603 is a liquid sealant used for waterproofing and corrosion protection.

[0039] Example 3

[0040] from Figure 6 , Figure 7 As can be seen, the universal joint of the present invention has a long service life: one end of the internal set screw 601 is a hexagonal countersunk hole and the other end is a spherical boss; one end of the external set screw 602 is a hexagonal countersunk hole and the other end is a cylindrical boss.

[0041] The recessed hexagonal head of the set screw facilitates installation and disassembly. The spherical boss of the inner set screw 601 can eliminate assembly errors in the circumferential direction of the bearing outer ring. Even when the set screw is not perpendicular to the plane 1011, it can effectively press the plane. The cylindrical boss of the outer set screw 602 can effectively contact the end face of the inner set screw 601, playing a role in preventing loosening.

[0042] Example 4

[0043] from Figure 2 , Figure 3 , Figure 4 , Figure 5 It can be seen that the universal joint of the present invention with a long service life: the intersection of the external threaded hole 202 and the outer circle of the fork head 2 is processed into a flat groove 204.

[0044] The flat groove 204 on the outer circle of the fork head 2 ensures the subsequent machining of the external threaded hole 202 and the internal threaded hole 203, so that the threaded hole can be perpendicular to the plane 1011, and ensure that the internal set screw 601 reliably presses against the outer ring 101 of the bearing.

[0045] In the fork head top limiting device 6, the external threaded hole 202, the internal threaded hole 203, and the flat groove 204 are all set at the top of the fork head, that is, at the position where the fork head is subjected to the least force, so they do not affect the strength.

[0046] Example 5

[0047] from Figure 2 , Figure 3 , Figure 4 , Figure 5 It can be seen that the universal joint of the present invention has a long service life: the diameter of the external threaded hole 202 is larger than that of the internal threaded hole 203, and the distance between the end of the thread of the external threaded hole 202 and the beginning of the thread of the internal threaded hole 203 is about 5 to 10 mm.

[0048] The design of the external and internal threaded holes ensures the installation of the external set screw 602 and the internal set screw 601, and enables the external set screw 602 to reliably tighten the internal set screw 601.

[0049] Example 6

[0050] from Figure 2 It can be seen that the present invention provides a universal joint with a long service life: two radial limiting units are pressed against the outside of the bearing outer ring 101.

[0051] The two radial limiting units are far from the center of the cross shaft 9, which can better limit the rotation of the outer ring 101 of the bearing.

[0052] Example 7

[0053] from Figure 8 , Figure 9 It is understood that the present invention provides a universal joint with a long service life: when the anti-rotation device is a bearing outer ring outer end face limiting device 7, it includes a limiting plate 701 and a set screw 702; the outer end face of the bearing outer ring 101 is provided with an opening groove 1012, the bottom of the opening groove 1012 is provided with a screw hole 1013, the bottom of the retaining ring groove of the bearing hole 201 is provided with a deep groove 204, the limiting plate 701 is provided with a hole at the position corresponding to the screw hole 1013, the upper part of the hole is embedded in the opening groove 1012, and the lower part passes through the notch of the retaining ring 3 and is inserted into the deep groove 204, and the set screw 702 passes through the end cover 5 and the limiting plate 701 and then screws into the screw hole 1013.

[0054] In the bearing outer ring outer end face limiting device 7: an open groove 1012 is provided on the outer end face of the bearing outer ring 101, and a deep groove 204 is provided at the bottom of the retaining ring groove of the bearing hole 201. The upper and lower parts of the limiting plate 701 are respectively installed in the open groove 1012 and the deep groove 204, and are fastened by the set screw 702. In this way, in the event of failure of the interference fit between the cross bearing and the fork bearing hole, since the upper and lower parts of the limiting plate 701 are connected to the bearing outer ring 101 and the body of the fork 2 respectively, the rotation of the bearing outer ring in both clockwise and counterclockwise directions can be effectively limited, thereby ensuring the stable and reliable operation of the universal joint throughout its life cycle, extending the service life of the universal joint, and ensuring the normal production of steel rolling. The deep groove 204 is located at the bottom of the bearing hole retaining ring groove, i.e., at the position of minimum force on the fork, and does not affect the strength.

[0055] To increase versatility, the set screw 702 can be one of the screws connecting the end cap 5 and the bearing 2.

[0056] When installing the outer end face limiting device 7 of the outer ring of the large bearing: first align the opening groove 1012 of the outer ring of the bearing 101, the deep groove 204 at the bottom of the retaining ring groove of the fork head 2, and the notch position of the retaining ring 3. Then, insert the limiting plate 701 into the opening groove 1012 and pass through the notch of the retaining ring 3 to insert it downward into the deep groove 204. Finally, install the end cover 5. A screw on the end cover 5 passes through the limiting plate 701 and connects to the screw hole 1013 on the end face of the outer ring of the bearing 101.

[0057] Example 8

[0058] from Figure 8 , Figure 9 It can be seen that the universal joint of the present invention has a long service life: the two sides of the limiting plate 701 are in contact with the two sides of the opening groove 1012 and the deep groove 204.

[0059] The limiting plate 701 fits into the opening groove 1012 and the deep groove 204 to prevent the limiting plate 701 from impacting the groove due to the gap when under force, thus aggravating wear and ensuring the reliability of the connection. It can effectively limit the rotation of the outer ring of the bearing in both clockwise and counterclockwise directions.

[0060] Example 9

[0061] from Figure 8 , Figure 9 It can be seen that the universal joint of the present invention has a long service life: the opening groove 1012 and the deep groove 204 have the same width and are smaller than the notch width after the snap ring 3 is assembled.

[0062] The width of the opening groove 1012 and the deep groove 204 restricts the width of the limiting plate 701, thereby ensuring that the limiting plate 701 can pass smoothly through the retaining ring 3 and cooperate with the opening groove 1012 and the deep groove 204.

[0063] Example 10

[0064] from Figure 8 , Figure 9 It can be seen that the universal joint of the present invention has a long service life: the vertical center line of the limiting plate 701 is collinear with the center line of the fork arm of the fork head 2.

[0065] The center lines of the limiting plate 701 and the fork arm of the fork head 2 are collinear, which ensures the uniformity of force on both sides of the limiting plate 701 in both positive and negative directions, ensures the reliability of the connection, and can effectively limit the rotation of the outer ring of the bearing in both clockwise and counterclockwise directions.

[0066] Example 11

[0067] from Figure 8 , Figure 9 As can be seen, the universal joint of the present invention with a long service life: the limiting plate 701 is a rectangular metal plate with a through hole.

[0068] The limiting plate 701 is a rectangular metal plate that ensures assembly with the opening groove 1012 and the deep groove 204, while the through hole enables connection with the bearing outer ring 101.

[0069] Example 12

[0070] from Figure 10 , Figure 11 , Figure 12 It is understood that the present invention provides a universal joint with a long service life: when the anti-rotation device is a bearing outer ring inner hole limiting device 8, it includes a limiting block 801 and a screw 802; an opening groove 205 is provided on the lower part of the inner end of the bearing hole 201, and a screw hole 206 is provided at the bottom of the opening groove 205; the lower part of the outer circle of the bearing outer ring 101 corresponding to the opening groove 205 is machined into a flat surface to form an L-groove 1013; the limiting block 801 is placed on the opening groove 205; and the screw 802 is screwed into the screw hole 206 to fix the limiting block 801 on the opening groove 205.

[0071] In the bearing outer ring inner bore limiting device 8: the outer circle of the left end of the bearing outer ring 101 is set as a plane, and an opening groove is set at the lower end of the inner side of the fork bearing hole 201. A limiting block is installed in the opening groove by bolts. In this way, in the event of failure of the interference fit between the cross bearing and the fork bearing hole, the upper plane of the limiting block 801 limits the transverse surface of the L groove 1013, thereby effectively restricting the rotation of the bearing outer ring in both clockwise and counterclockwise directions. This ensures the stable and reliable operation of the universal joint throughout its life cycle, extends the service life of the universal joint, and ensures the normal production of steel rolling. The opening groove 205 is located at the lower end of the inner side of the fork bearing hole, which is the position of minimum force on the fork and does not affect the strength.

[0072] When installing the bearing outer ring inner hole limiting device 8: place the limiting block 801 on the opening groove 205 and push it to the rightmost side so that the right end face of the limiting block 801 fits against the right end face of the opening groove 205, and tighten it with screw 802.

[0073] Example 13

[0074] from Figure 10 , Figure 11 , Figure 12 It can be seen that the universal joint of the present invention has a long service life: the right end face of the limiting block 801 is in contact with the right end face of the opening groove 205, and there is a gap with the right end face of the L groove 1013.

[0075] The right end face of the limiting block 801 fits against the right end face of the opening groove 205, ensuring the reliability of the installation of the limiting block 801; a gap is left between the limiting block 801 and the right end face of the L groove 1013 to ensure that the limiting block 801 does not obstruct the bearing outer ring 101 from being installed from the right side, thus ensuring the rationality of the overall structure.

[0076] Example 14

[0077] from Figure 10 , Figure 11 , Figure 12 It can be seen that the universal joint of the present invention has a long service life: the two sides of the limiting block 801 are in contact with the two sides of the opening groove 205.

[0078] The limiting plate 801 fits against the two sides of the opening groove 205 to prevent the limiting plate 801 from impacting the groove when under force, thus preventing increased wear and ensuring the reliability of the connection. It can effectively limit the rotation of the outer ring of the bearing in both clockwise and counterclockwise directions.

[0079] Example 15

[0080] from Figure 10 , Figure 11 , Figure 12 It can be seen that the universal joint of the present invention has a long service life: the vertical center line of the limiting block 801 is collinear with the center line of the fork arm of the fork head 2.

[0081] The center of the limit block 801 and the center of the fork head 2 are collinear, which ensures the uniformity of the force on the limit block 801, prevents wear on both sides, ensures the reliability of the connection, and can effectively limit the rotation of the outer ring of the bearing in both clockwise and counterclockwise directions.

[0082] Example 16

[0083] from Figure 10 , Figure 11 , Figure 12 As can be seen, the universal joint of the present invention has a long service life: the limiting block 801 is a rectangular metal block, which is provided with a through hole and a countersunk hole.

[0084] The limiting plate 801 is a rectangular metal plate that ensures assembly with the opening slot 205, while the through hole and countersunk hole enable connection with the fork head 2.

[0085] The universal joint of this invention can be of SWC or SWP structure.

[0086] Example 17

[0087] from Figure 14 As can be seen, the present invention provides a coupling comprising two universal joints on the left and right, and a connecting shaft assembly in the middle.

[0088] The coupling can be of SWC or SWP structure.

[0089] The advantages of this universal joint are: 1. It provides three different anti-rotation devices. In the event of interference fit failure of the bearing outer ring, all three devices can effectively limit the rotation of the bearing outer ring in both clockwise and counterclockwise directions, thereby ensuring stable and reliable operation of the universal joint throughout its lifespan, extending its service life, and guaranteeing normal steel rolling production; the three devices offer multiple options, and any one can be selected. 2. The fork head top limiting device restricts rotation from above the bearing outer ring, with the external threaded hole, internal threaded hole, and flat groove all located at the top of the fork head, minimizing the force on the fork head. The bearing outer ring outer end face limiting device restricts rotation from the outer end face of the bearing outer ring. The deep groove is located at the bottom of the bearing hole retaining ring groove, which is the position where the fork head experiences the least force, and does not affect the strength. The bearing outer ring inner hole limiting device restricts rotation from the bottom surface of the inner side of the bearing outer ring. The open groove is located at the lower end of the inner side of the fork head bearing hole, which is the position where the fork head experiences the least force, and does not affect the strength. The above three anti-rotation devices can effectively limit the rotation of the bearing outer ring in both clockwise and counterclockwise directions, and are all located at the position where the fork head experiences the least force, without affecting the strength of the fork head. At the same time, the universal joint of this invention includes universal joints with SWC and SWP structures. After processing the above universal joints, they are applied to universal couplings and have achieved good performance.

Claims

1. A universal joint with a long service life, characterized in that: It includes a cross shaft (9), two forks (2), and four bearing assemblies. A bearing assembly is provided between the four shaft ends of the cross shaft (9) and the bearing holes of the two fork arms at both ends of the two forks (2). Each bearing assembly includes a bearing (1), a retaining ring (3), a sealing ring (4), and an end cap (5). The outer side of the bearing (1) is fitted with a retaining ring (3), a sealing ring (4), and an end cap (5). The end cap (5) is connected to the bearing (1) by bolts. The outer ring (101) of the bearing (1) is press-fitted with the bearing hole (201) of the fork (2). An anti-rotation device is provided between the bearing (1) and the fork (2) to restrict the rotation of the outer ring (101): when the anti-rotation device is a shaft... When the bearing outer ring inner hole limiting device (8) is used, it includes a limiting block (801) and a screw (802); an opening groove (205) is provided on the lower part of the inner end of the bearing hole (201), and a screw hole (206) is provided at the bottom of the opening groove (205). The lower part of the outer circle of the bearing outer ring (101) corresponding to the opening groove (205) is machined into a flat surface to form an L groove (1013). The limiting block (801) is placed on the opening groove (205), and the screw (802) is screwed into the screw hole (206) to fix the limiting block (801) on the opening groove (205). The right end face of the limiting block (801) is in contact with the right end face of the opening groove (205) and a gap is left with the right end face of the L groove (1013).

2. The universal joint according to claim 1, characterized in that: When the anti-rotation device is a fork top limiting device (6), it includes two limiting units set above the bearing hole (201). The two limiting units are symmetrically arranged with respect to the center line of the fork arm of the fork (2). Each limiting unit includes an inner set screw (601), an outer set screw (602), and sealant (603). The fork (2) has an outer threaded hole (202) and an inner threaded hole (203) machined above the bearing hole (201). The two threaded holes are coaxial. The outer circle of the bearing outer ring (101) corresponding to the two inner threaded holes (203) is machined into a plane (1011). The inner set screw (601) is screwed into the inner threaded hole (203) and pressed on the plane (1011). The outer set screw (602) is screwed into the outer threaded hole (202) and presses the inner set screw (601). The sealant (603) is filled on the outside of the outer set screw (602).

3. The universal joint according to claim 2, characterized in that: The internal set screw (601) has a countersunk hole at one end and a spherical boss at the other end; the external set screw (602) has a countersunk hole at one end and a cylindrical boss at the other end.

4. The universal joint according to claim 2, characterized in that: The diameter of the external threaded hole (202) is larger than that of the internal threaded hole (203), and the distance between the end of the thread of the external threaded hole (202) and the beginning of the thread of the internal threaded hole (203) is 5-10 mm.

5. The universal joint according to claim 1, characterized in that: When the anti-rotation device is a bearing outer ring outer end face limiting device (7), it includes a limiting plate (701) and a set screw (702); the outer end face of the bearing outer ring (101) is provided with an opening groove (1012), the bottom of the opening groove (1012) is provided with a screw hole (1013), the bottom of the retaining ring groove of the bearing hole (201) is provided with a deep groove (204), the limiting plate (701) is provided with a hole at the position corresponding to the screw hole (1013), the upper part of the hole is embedded in the opening groove (1012), and the lower part passes through the notch of the retaining ring (3) and is inserted into the deep groove (204). The set screw (702) passes through the end cover (5) and the limiting plate (701) and then screws into the screw hole (1013).

6. The universal joint according to claim 5, characterized in that: The two sides of the limiting plate (701) are in contact with the two sides of the opening groove (1012) and the deep groove (204).

7. The universal joint according to claim 5, characterized in that: The widths of the opening groove (1012) and the deep groove (204) are the same and smaller than the notch width after the snap ring (3) is assembled.

8. A coupling, characterized in that: It includes two universal joints as described in any one of claims 1-7 on the left and right, and a connecting shaft assembly in the middle.

Images