JP2021110398A - Universal joint - Google Patents

Abstract

To provide a universal joint capable of being quickly recovered even when failure occurs due to continuous use and the like.SOLUTION: A universal joint 10 includes: a cross shaft 11 having a trunnion 21; a bearing cup 12 supporting the trunnion 21 through a plurality of rollers, and provided with a first through hole 25 penetrating in a joint shaft direction; a yoke 13 applying one side face in the joint shaft direction as a joint face 26 to the bearing cup 12, having a recessed portion 27 opened to an outer peripheral side, and provided with a second through hole 28 penetrating to the recessed portion 27 from the joint face 26; a bolt 14 for fastening the bearing cup 12 and the yoke 13; and a fastened member 15 fitted to the recessed portion 27, and provided with a bolt hole 29 to which the bolt 14 inserted to the first through hole 25 and the second through hole 28 is coupled.SELECTED DRAWING: Figure 2

Description

The present invention relates to a universal joint.

Universal joints are used to transmit rotational power (torque) between two axes where the centerlines intersect. Universal joints are used, for example, in rolling mills in steel mills. Specifically, the universal joint is used between the drive shaft rotated by the drive motor and the shaft of the rolling roll. Large universal joints may be used in rolling mills. Patent Document 1 discloses a universal joint used in a rolling mill.

The universal joint of a rolling mill is used in an environment where the rotational power transmitted is large and it is exposed to heat and water. Moreover, the rolling mill operates continuously except for the maintenance period specified in advance. When a defect occurs in the universal joint, it is necessary to stop the rolling work, and the operation is stopped until the defect is resolved.

Japanese Unexamined Patent Publication No. 2006-7874

FIG. 8 is an exploded perspective view of a conventional universal joint. The universal joint includes a cross shaft 90 having four trunnions 91, a bearing cup 93 that supports each trunnion 91 via a plurality of rollers 92, a yoke 94, and a bolt for fastening the bearing cup 93 and the yoke 94. Has 95 and.

The bearing cup 93 is provided with a plurality of through holes 96. One surface of the yoke 94 in the axial direction serves as a joint surface 97 with the bearing cup 93. FIG. 9 is a view of the yoke 94 viewed from one side in the axial direction. FIG. 10 is a cross-sectional view of the yoke 94. The yoke 94 is provided with a bolt hole 98 that opens at the joint surface 97. The bolt 95 (see FIG. 8) is inserted through the through hole 96 of the bearing cup 93 and coupled with the bolt hole 98 of the yoke 94. As a result, the bearing cup 93 is fastened to the yoke 94.

During the operation of the rolling mill, a load is repeatedly applied to the universal joint at the joint between the bearing cup 93 and the yoke 94. As a result, cracks may occur in the yoke 94 starting from the bolt holes 98 (see FIG. 10) provided in the yoke 94. In particular, when a plurality of bolt holes 98 are provided close to each other, cracks are likely to occur. One of the causes of cracks is that a tensile force is repeatedly applied to each bolt 95 during rotation, and the periphery of the bolt hole 98 to which the tensile force is transmitted is fatigued. In particular, cracks may occur at the bottom 99 of the bolt hole 98, which is relatively thin.

If any crack occurs in the yoke 94, it is necessary to replace the entire yoke 94. The yoke 94 used in the rolling mill is a large product, requires a lot of time and cost to be replaced, and the original work (rolling) is stopped during the replacement. It should be noted that such a problem may occur in a machine other than the rolling mill.

Therefore, an object of the present disclosure is to provide a universal joint that can be quickly restored even if a problem occurs due to continuous use or the like.

The universal joint of the present disclosure includes a cross shaft having a trunnion, a bearing cup that supports the trunnion via a plurality of rollers and is provided with a first through hole that penetrates in the joint axial direction, and one of the joint axial directions. A yoke having a side surface serving as a joint surface with the bearing cup, a recess formed on the outer peripheral side, and a second through hole penetrating from the joint surface to the recess, and the bearing cup. A bolt for fastening the yoke and a member to be fastened are provided with a bolt hole that fits into the recess and connects the first through hole and the bolt through which the second through hole is inserted.

According to the universal joint, the bolt for fastening the bearing cup and the yoke is coupled to the bolt hole of the member to be fastened in the recessed portion of the yoke. Therefore, even if a crack occurs in a portion around the bolt hole, the portion to be fastened is a member to be fastened, so that the member to be fastened may be replaced instead of the entire yoke. The members to be fastened are easy to replace and can be quickly restored.
The "joint axial direction" is the axial direction of the yoke to which the bearing cup is fastened, and the joint axial direction includes a direction parallel to the axial direction of the yoke.

Further, preferably, the yoke is formed with the first recess and a second recess connecting the first recess and the joint surface to connect the bearing cup and the member to be fastened. Along with this, a connecting portion that fits into the second recess is further provided.
According to the above configuration, when a load directed to one side in the joint axial direction acts on the bearing cup, the member to be fastened connected to the bearing cup via the connecting portion comes into contact with the surface of the first recess in the yoke. .. As a result, it is possible to prevent the bearing cup from coming off from the yoke to one side in the joint axial direction.

Further, preferably, the universal joint has a direction orthogonal to the joint axial direction as a bolt axial direction, and further includes a second bolt for fastening the member to be fastened to the yoke.
According to the above configuration, the unit consisting of the bearing cup, the connecting portion, and the member to be fastened is fitted into the first recess and the second recess from the outside in the radial direction of the joint by the second bolt. The unit including the member to be fastened is fastened to the yoke. As a result, the unit does not fall out of the yoke in the radial direction of the joint.
Regarding the second bolt, the "bolt axial direction" is the axial direction of the second bolt.

Further, preferably, the member to be fastened is fitted into the first recess with a tightening allowance in the joint axial direction.
According to the above configuration, the first recess of the yoke and the member to be fastened are in surface contact with each other in the joint axial direction. The load acting on the bearing cup in the joint axial direction can be transmitted to the yoke through the surface where the first recess and the member to be fastened come into contact with each other. Therefore, it is possible to suppress the action of a large axial force on the bolt for fastening the bearing cup and the yoke.

According to the universal joint of the present disclosure, even if a crack occurs in a portion around a bolt hole to which a bolt for fastening the yoke and the bearing cup is connected, it can be quickly restored.

It is an exploded perspective view which shows an example of a universal joint. It is a perspective view which shows a bearing cup, a yoke, a bolt, and a member to be fastened. It is the figure which looked at the yoke and the member to be fastened from one side in the axial direction. It is a side view which looked at the yoke and the member to be fastened from the outside in the radial direction toward the center line. It is a perspective view which shows the fastened member and its surroundings which concerns on a modification. It is a perspective view which shows a part of the joint which concerns on another form (the second form). It is an exploded view of a part of the joint shown in FIG. It is an exploded perspective view of the conventional universal joint. It is the figure which looked at the yoke from one side in the axial direction. It is sectional drawing of the yoke.

[Overall configuration of universal joint]
The universal joint of the present disclosure is used, for example, in a rolling mill of a steel mill. Specifically, although not shown, the universal joint is used between the drive shaft rotated by the drive motor and the shaft of the rolling roll. Even when the center line of the drive shaft and the center line of the shaft of the rolling roll intersect, the universal joint transmits rotational power (torque) between the drive shaft and the shaft of the rolling roll. It is possible.

FIG. 1 is an exploded perspective view showing an example of the universal joint. The universal joint 10 shown in FIG. 1 includes one cross shaft 11, four bearing cups 12, two yokes 13, bolts 14 for fastening the bearing cups 12 and the yokes 13, and members separate from the yokes 13. It is provided with a member 15 to be fastened to be attached to the yoke 13. Hereinafter, the universal joint 10 may be referred to as a "joint 10".

The cross axis 11 has four trunnions 21. Each bearing cup 12 is a member that supports each trunnion 21 via a plurality of rollers 22. The bearing cups 12 all have the same configuration. The first yoke 13 shown on the right side in FIG. 1 is included in the first shaft 16, and the first yoke 13 rotates integrally with the first shaft 16. The second yoke 13 shown on the left side in FIG. 1 is included in the second shaft 17, and the second yoke 13 rotates integrally with the second shaft 17. The first yoke 13 and the second yoke 13 have the same configuration.

The center line of the first axis 16 (first yoke 13) and the center line of the second axis 17 (second yoke 13) are arranged in the same straight line (the state shown in FIG. 1). The direction along the line is defined as the "joint axial direction". The sign of the center line having the same linear shape is defined as "C". In the invention of the present disclosure, the "joint axial direction" also includes a direction parallel to the center line C. The "joint axial direction" may be simply referred to as the "axial direction".
The direction orthogonal to the center line C is defined as the "joint radial direction". The "joint radial direction" may be simply referred to as the "diameter direction".
The direction of rotation about the center line C is defined as the "joint circumferential direction". The "joint circumferential direction" may be simply referred to as the "circumferential direction".

In the first yoke 13 shown on the right side of FIG. 1, two key grooves 23 are provided on one surface in the axial direction. Each of the two bearing cups 12 fastened to the first yoke 13 has a key 24 that fits into the keyway 23. With the key 24 fitted in the keyway 23, the bearing cup 12 is fastened to the first yoke 13 with bolts 14. The same applies to the second yoke 13 shown on the left side of FIG. 1, and the bearing cup 12 is fastened to the second yoke 13 by the bolt 14 with the key 24 fitted in the key groove 23. In the case of the form shown in FIG. 1, the number of bolts 14 required to fasten one bearing cup 12 to the yoke 13 is six, but it can be changed.

[Structure of each part of joint 10 (first form)]
FIG. 2 is a perspective view showing a bearing cup 12, a yoke 13, a bolt 14, and a member to be fastened 15. FIG. 3 is a view of the yoke 13 and the member to be fastened 15 viewed from one side in the axial direction. FIG. 4 is a side view of the yoke 13 and the member to be fastened 15 viewed from the outside in the radial direction toward the center line C. 2, FIG. 3 and FIG. 4 show a state in which the member to be fastened 15 is removed from the yoke 13, and FIGS. 3 and 4 show only half of the yoke 13.

In FIG. 2, the bearing cup 12 is provided with a first through hole 25. The first through hole 25 penetrates the bearing cup 12 in the axial direction. The first through holes 25 are provided on both sides of the bearing cup 12 in the circumferential direction. In the form shown in FIG. 2, three first through holes 25 are provided on one side in the circumferential direction, and three first through holes 25 are provided on the other side in the circumferential direction. The inner diameter of the first through hole 25 is larger than the outer diameter of the shaft portion of the bolt 14. As shown in FIGS. 2 and 3, in the yoke 13, one surface in the axial direction is the joint surface 26 with the bearing cup 12. The joint surface 26 is a surface orthogonal to the center line C. The key groove 23 is formed on the joint surface 26.

As shown in FIGS. 2 and 4, a recess 27 is formed in a part of the outer peripheral surface of the yoke 13. The recess 27 is a groove that opens toward the outer peripheral side. The recess 27 is formed at a circumferential position corresponding to the fastening position of the bearing cup 12. The yoke 13 is provided with a second through hole 28 that penetrates from the joint surface 26 to the recess 27 (see FIG. 4). The second through hole 28 is a hole formed so as to extend in the axial direction from the joint surface 26 to the inner wall surface 39 on one side of the recess 27 in the axial direction. A plurality of second through holes 28 are provided in the yoke 13 in the same arrangement as the first through holes 25 of the bearing cup 12. The inner diameter of the second through hole 28 is larger than the outer diameter of the shaft portion of the bolt 14.

The member to be fastened 15 has a shape that fits into the recess 27. The bolt hole 29 is provided in the member to be fastened 15. A plurality of bolt holes 29 are provided in the member to be fastened 15 in the same arrangement as the second through hole 28 of the yoke 13. The bolt 14 through which the first through hole 25 and the second through hole 28 are inserted is coupled (screwed) to the bolt hole 29. When the bolt 14 is coupled to the bolt hole 29, the bearing cup 12 is fastened to the yoke 13, and the bearing cup 12 and the yoke 13 are integrated.

The bolt hole 29 may be a bottomed hole or a hole that penetrates the member to be fastened 15. The tip of the bolt 14 is located within the range of the bolt hole 29 in a state where the bolt 14 is coupled to the bolt hole 29 and the bearing cup 12 is fastened to the yoke 13 by the bolt 14.
The member to be fastened 15 has an arcuate surface 31 having a shape that matches the outer peripheral surface 30 of the yoke 13. Therefore, in a state where the member to be fastened 15 is fitted into the recess 27 and fixed by the bolt 14, one cylindrical surface is formed by the outer peripheral surface 30 of the yoke 13 and the arcuate surface 31 of the member 15 to be fastened. The member to be fastened 15 is preferably fitted into the recess 27 with a tightening allowance in the joint axial direction.

Here, a defect that may occur in the joint 10 will be described. When the joint 10 rotates, a load repeatedly acts at the fastening portion between the bearing cup 12 and the yoke 13. Specifically, a load in the direction of pulling the bolt 14 in the axial direction is repeatedly generated between the bearing cup 12 and the yoke 13. In this case, the tensile load acting on the bolt 14 also acts around the bolt hole 29 connected to the bolt 14. As a result, the periphery of the bolt hole 29 becomes fatigued, and cracks may occur in a particularly thin portion around the bolt hole 29.

Therefore, even if a crack occurs, the joint 10 shown in FIGS. 2, 3 and 4 has a configuration in which the location of the crack is not the yoke 13 but the member to be fastened 15. .. The configuration will be described below.

As described above (see FIG. 2), the joint 10 is a bolt for fastening the bearing cup 12 and the yoke 13 to the yoke 13 whose one surface in the axial direction is the joint surface 26 with the bearing cup 12. 14 and a member to be fastened 15. The bearing cup 12 is provided with a first through hole 25 that penetrates in the axial direction. The yoke 13 is formed with a recess 27 that opens on the outer peripheral side, and is further provided with a second through hole 28 that penetrates from the joint surface 26 to the recess 27. The member to be fastened 15 is a member separate from the yoke 13, and fits into the recess 27 of the yoke 13. The member to be fastened 15 is provided with a bolt hole 29 to which the bolt 14 through which the first through hole 25 and the second through hole 28 are inserted is connected. That is, the bolt hole 29 to be coupled to the bolt 14 is provided not in the yoke 13 but in the member to be fastened 15 which is a separate member from the yoke 13.

According to this configuration, for example, even if the joint 10 is continuously used for a long period of time and a crack is generated around the bolt hole 29, the place where the crack is generated is not the yoke 13 but the member to be fastened 15. Therefore, even if a crack occurs, the member to be fastened 15 may be replaced instead of the entire yoke 13. The member to be fastened 15 is smaller than the yoke 13, and its shape is also simplified, so that the member to be fastened 15 can be easily replaced. Therefore, even if the above-mentioned crack occurs in the fastened member 15, the joint 10 can be quickly restored by replacing the fastened member 15.

In the joint 10 shown in FIGS. 2, 3 and 4, one bearing cup 12 is provided with one member to be fastened 15. On the other hand, as a modification, two members to be fastened 15 may be provided for one bearing cup 12. FIG. 5 is a perspective view showing the member to be fastened 15 and its surroundings according to the modified example. The fastened member 15 shown in FIG. 5 has two segments 15a and 15b. Each of the segments 15a and 15b is provided with a bolt hole 29 to be connected to the bolt 14. In the case of the modification shown in FIG. 5, the yoke 13 is formed with two recesses 27a and 27b into which the two segments 15a and 15b are fitted, respectively.

[Second form of joint 10]
FIG. 6 is a perspective view showing a part of the joint 10 according to the second embodiment. FIG. 7 is an exploded view of a part of the joint 10 shown in FIG.
Here, in the joint 10 (first form) shown in FIGS. 2, 3 and 4, the bearing cup 12 and the member to be fastened 15 are separate members. On the other hand, in the joint 10 according to the second form, the bearing cup 12 and the member to be fastened 15 are configured as one member (unit 32).

Further, in the second form, the shape of the recess formed in the yoke 13 for fitting the fastened member 15 (the unit 32 including the fastened member 15) is different from the first form. Except for the configuration described in particular, the first embodiment and the second embodiment are the same, and the description of the same configuration will be omitted. Further, in the first form and the second form, the same components (components) are designated by the same reference numerals.

In FIGS. 6 and 7, a second recess 33 is formed in the yoke 13 together with a first recess 27 into which the member to be fastened 15 fits. The second recess 33 connects the first recess 27 and the joint surface 26. The second recess 33, together with the first recess 27, opens on the outer peripheral side of the yoke 13. The first recess 27 is the same as the recess 27 in the first embodiment.

The joint 10 of the second form further includes a connecting portion 34 that connects the bearing cup 12 and the member to be fastened 15. The connecting portion 34 constitutes one unit 32 in which the bearing cup 12 and the member to be fastened 15 are integrated. The member to be fastened 15 fits into the first recess 27, and the connecting portion 34 fits into the second recess 33. In FIG. 7, the circumferential dimension B1 of the connecting portion 34 is smaller than the circumferential dimension B2 of the bearing cup 12, and is smaller than the circumferential dimension B3 of the member to be fastened 15.

The circumferential dimension B1 of the connecting portion 34 and the circumferential dimension B4 of the second recess 33 are set to be the same (almost the same). The connecting portion 34 can make surface contact with each of the surfaces 33a on both sides of the second recess 33 facing the circumferential direction from the circumferential direction. With the above configuration, as shown in FIG. 6, the bearing cup 12, which is a part of the unit 32, is shafted with respect to the yoke 13 in a state where the unit 32 is fitted in the first recess 27 and the second recess 33. It becomes immovable in both directions.

In FIG. 7, the axial dimension H1 of the member to be fastened 15 is set to be slightly larger than the axial dimension H2 of the first recess 27. Therefore, the member to be fastened 15 is attached to the first recess 27 by press fitting. That is, the member to be fastened 15 is fitted into the first recess 27 with a tightening allowance in the axial direction.
The member to be fastened 15 comes into contact with the inner surface 40 of the first recess 27, so that the member 15 cannot move inward in the radial direction.

In FIG. 6, the bearing cup 12, which is a part of the unit 32, cannot be moved radially outward with respect to the yoke 13 by the second bolt 35. Therefore, as shown in FIG. 7, a hole (sagging hole) 37 penetrating in the radial direction of the joint 10 is formed in the member to be fastened 15 in the unit 32. A second bolt hole 36 is provided in the first recess 27 of the yoke 13. The depth direction of the second bolt hole 36 coincides with the radial direction of the joint 10. The second bolt 35 (see FIG. 6) is coupled (screwed) to the second bolt hole 36. As described above, the joint 10 according to the second embodiment further includes a second bolt 35 having a direction orthogonal to the joint axial direction as the bolt axial direction. The member to be fastened 15 is fastened to the yoke 13 by the second bolt 35.

As described above, the unit 32 including the bearing cup 12 is attached to the yoke 13 by the second bolt 35 so as to be immovable in the radial direction.
Here, when the joint 10 rotates, a load (axial load) in the direction in which the bearing cup 12 is to move in the axial direction acts on the bearing cup 12, and the bearing cup 12 is moved in the radial direction with respect to the yoke 13. The load in the direction (radial load) acts.

The axial load acting on the bearing cup 12 is transmitted to the member to be fastened 15 through the connecting portion 34. As described above, the member to be fastened 15 fits into the first recess 27 and is immovable in the axial direction with respect to the yoke 13. Therefore, the axial load is transmitted to the yoke 13, and the yoke 13 supports the axial load.

The radial load acting on the bearing cup 12 is transmitted to the member to be fastened 15 through the connecting portion 34. The member to be fastened 15 is fixed to the yoke 13 by a second bolt 35. Therefore, the radial load is transmitted to the yoke 13, and the yoke 13 supports the radial load.

In the case of the first embodiment, as shown in FIGS. 2 and 3, the yoke 13 has a wall portion (pilot portion) 38 in which the bearing cup 12 receives a force outward in the radial direction. A part of the bearing cup 12 comes into contact with the wall portion 38 from the inside in the radial direction. The radial load acting on the bearing cup 12 is transmitted to the yoke 13 by coming into contact with the wall portion 38. From the above, in the case of the first embodiment, the bearing cup 12 becomes immovable in the radial direction with respect to the yoke 13 when a part of the bearing cup 12 comes into contact with the wall portion 38 from the inside in the radial direction.

Thus, in the first form, the wall 38 is required. On the other hand, in the second embodiment, the radial load is supported by the yoke 13 via the second bolt 35. Therefore, the wall portion 38 is unnecessary. The first form and the second form are different in the necessity of the wall portion 38.

Further, in the first embodiment (see FIG. 2), the rotational power (torque) is transmitted between the bearing cup 12 and the yoke 13 by the key groove 23 and the key 24.
On the other hand, in the second embodiment, the transmission of the rotational power is performed by the connecting portion 34 and the second recess 33 that comes into contact with the connecting portion 34 in the circumferential direction. Therefore, in the second form, the key groove 23 and the key 24 as in the first form are unnecessary.

As described above, also in the joint 10 according to the second form shown in FIGS. 6 and 7, the fastened member 15 which is a part of the unit 32 fits into the recess 27 of the yoke 13. The bolt (first bolt) 14 is used to fasten the bearing cup 12 and the yoke 13. Specifically, the bolt 14 through which the first through hole 25 of the bearing cup 12 and the second through hole 28 of the yoke 13 are inserted is coupled to the bolt hole 29. The bolt hole 29 is provided in a member to be fastened 15 which is a part of the unit 32.

According to the joint 10 according to the second embodiment, the bolt 14 is coupled to the bolt hole 29 of the member to be fastened 15 which is fitted in the recess 27 of the yoke 13. Therefore, even if the joint 10 is continuously used for a long period of time, for example, and a crack is generated around the bolt hole 29, the place where the crack is generated is not the yoke 13 but the member to be fastened 15.
Therefore, even if a crack occurs in a portion around the bolt hole 29, the unit 32 including the member to be fastened 15 may be replaced instead of the entire yoke 13. The unit 32 is a member smaller than the yoke 13, and its shape is also simplified, so that the unit 32 can be easily replaced. Therefore, even if the above-mentioned crack occurs in the member to be fastened 15, the joint 10 can be quickly restored by replacing the unit 32.

The yoke 13 of the second form is formed with a second recess 33 together with a first recess 27 into which the member to be fastened 15 fits. The bearing cup 12 and the member to be fastened 15 are connected by a connecting portion 34, and the connecting portion 34 fits into the second recess 33. According to this configuration, when a load is applied to the bearing cup 12 in a direction away from the yoke 13 (one in the axial direction), the fastened member 15 connected to the bearing cup 12 via the connecting portion 34 is the first. It contacts the inner wall surface 39 on one side in the axial direction of the recess 27. As a result, it is possible to prevent the bearing cup 12 from coming off from the yoke 13 on one side in the axial direction.

By engaging the fastened member 15 with the first recess 27 in this way, the unit 32 can resist the force acting on the bearing cup 12 in one axial direction. Therefore, even if a force acting in one direction in the axial direction acts on the bearing cup 12, it is possible to suppress a large axial force from acting on the first bolt 14. As a result, it is possible to prevent a large load from acting around the bolt holes 29 of the member to be fastened 15.

In particular, in the second embodiment, the member to be fastened 15 is fitted into the first recess 27 with a tightening allowance in the axial direction. Therefore, the first recess 27 and the member to be fastened 15 are in surface contact with each other in the axial direction. The axial load acting on the bearing cup 12 can be transmitted to the yoke 13 through the surface where the first recess 27 and the member to be fastened 15 come into contact with each other. Therefore, even if a force acting in one direction in the axial direction acts on the bearing cup 12, it is possible to more effectively suppress the action of a large axial force on the first bolt 14.

As described above, in the case of the joint 10 of the second form, it is possible to suppress the action of a large axial force on the first bolt 14. As a result, a large load does not act around the bolt hole 29 of the member to be fastened 15, and it is possible to prevent cracks from occurring around the bolt hole 29 of the member to be fastened 15. According to the second embodiment, even if the plurality of bolt holes 29 are provided close to each other, the occurrence of cracks is prevented. Even if a crack occurs in the portion around the bolt hole 29, the joint 10 can be quickly restored by replacing the unit 32.

Further, as described above, the joint 10 of the second form further includes a second bolt 35 for fastening the member to be fastened 15 to the yoke 13 (see FIG. 6). The longitudinal direction of the second bolt 35, that is, the bolt axial direction is a direction (diameter direction) orthogonal to the axial direction of the joint 10. According to this configuration, the unit 32 formed by the bearing cup 12, the connecting portion 34, and the member to be fastened 15 is fitted into the first recess 27 and the second recess 33 from the radial outside of the joint 10. Then, the unit 32 including the member to be fastened 15 is fastened to the yoke 13 by the second bolt 35. As described above, even if the wall portion (pilot portion) 38 required in the first form (see FIG. 2) is omitted, in the second form, the unit 32 is moved from the yoke 13 by the second bolt 35. Does not fall out in the radial direction of the joint.

〔others〕
The embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of rights of the present invention is not limited to the above-described embodiment, and includes all modifications within the scope equivalent to the configuration described in the scope of claims.

10: Universal joint 11: Cross shaft 12: Bearing cup 13: Yoke 14: Bolt (first bolt)
15: Member to be fastened 21: Trunnion 22: Roller 25: First through hole 26: Joint surface 27: Recess (first recess)
28: Second through hole 29: Bolt hole 33: Second recess 34: Connecting part 35: Second bolt

Claims (4)

With a cross axis with a trunnion,
A bearing cup that supports the trunnion via a plurality of rollers and is provided with a first through hole that penetrates in the joint axial direction.
A yoke in which one surface in the joint axial direction serves as a joint surface with the bearing cup, a recess opening on the outer peripheral side is formed, and a second through hole penetrating from the joint surface to the recess is provided. ,
Bolts for fastening the bearing cup and the yoke,
A member to be fastened, which is fitted in the recess and is provided with a bolt hole for connecting the first through hole and the bolt through which the second through hole is inserted.
With a universal joint. The yoke is formed with the first recess and a second recess connecting the first recess and the joint surface.
The universal joint according to claim 1, further comprising a connecting portion that connects the bearing cup and the member to be fastened and fits into the second recess. The universal joint according to claim 2, wherein a direction orthogonal to the joint axial direction is defined as a bolt axial direction, and a second bolt for fastening the member to be fastened to the yoke is further provided. The universal joint according to claim 2 or 3, wherein the member to be fastened is fitted into the first recess with a tightening margin in the joint axial direction.

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