JP2024043210A - Fixed constant velocity universal joint - Google Patents

Abstract

[Problem] To provide a fixed type constant velocity universal joint that can exhibit excellent sealing performance with fewer parts than conventional ones even when it is designed to support high loads. [Solution] This fixed type constant velocity universal joint 10 includes an outer joint member 11, a plurality of torque transmission members 13, a holding member 14, and a seal portion 30. The seal portion 30 has a boot 31 and a boot mounting member 33 to which a large diameter end portion 32 of the boot 31 is attached at one axial end side, and a shaft connecting member 19 is fitted and fixed to the outer periphery of the outer joint member 11. A first flange portion 45 is provided at the other axial end side of the boot mounting member 33, a fitting portion 21 that fits with the outer periphery of the outer joint member 11 is provided at one axial end side of the shaft connecting member 19, and a second flange portion 22 is provided radially outward of the fitting portion 21, and the first flange portion 45 and the second flange portion 22 are connected to each other with their end faces abutting each other. [Selected Figure] Figure 1

Description

The present invention relates to a fixed type constant velocity universal joint, and particularly to a seal structure for a fixed type constant velocity universal joint.

Constant velocity universal joints are broadly divided into fixed type constant velocity universal joints that allow only angular displacement, and sliding type constant velocity universal joints that allow both angular and axial displacement. Of these, fixed type constant velocity universal joints generally have multiple outer track grooves that extend along the axial direction at equal intervals in the circumferential direction on the inner surface of the outer joint member, and inner track grooves that face the outer track grooves in the radial direction on the outer surface of the inner joint member that is assembled inside the outer joint member. In this case, torque transmission members such as balls are assembled between the inner track grooves and the outer track grooves, and the torque transmission members are held by a cage (retainer) assembled between the outer joint member and the inner joint member.

In addition, fixed constant velocity universal joints are equipped with an outer diameter flange portion that protrudes in the outer diameter direction at one end in the axial direction of the annular outer joint member, and the torque is transmitted to the other party through the outer diameter flange portion. A fixed constant velocity universal joint of a type called a fixed cup type is fixed to a mounting flange member which is a side member, and a torque transmission partner member is attached to the outer periphery of a disk-shaped outer joint member that does not have an outer diameter flange part. There is a type of fixed constant velocity universal joint called a fixed disk type, which is fixed by fitting a mounting flange member.

However, in large-sized fixed disk constant velocity universal joints that can handle high loads, the torque input from the drive source such as a motor is large, so there is a risk that torque transmission will not be sufficient if the torque is transmitted by friction between the contact surfaces of the outer joint member and the mounting flange member, which are connected by multiple bolts and are simply a clearance fit between cylindrical surfaces. For this reason, constant velocity universal joints for the above-mentioned applications use tooth surface engagement with unevenness formed on the mating surfaces of each other.

However, in the case of the above-mentioned fixed disc type, the fitting part between the outer joint member and the mounting flange member is located on the outermost side of the outer joint member, so it is difficult to prevent heat, scale scattering, adhesion of chemicals, etc. easily influenced. Therefore, in harsher usage environments than expected, there is an increased risk that the tooth surfaces forming the fitting portion will corrode. Further, even in the case of forming a fitting structure between cylindrical surfaces that are not tooth surface fitting, corrosion may occur on the fitting surfaces. Corrosion of the fitting portion causes play in the fitting portion, and increased play may lead to a decrease in the performance of the joint.

The present applicant has disclosed a fixed type constant velocity universal joint in Patent Document 1 to solve the above-mentioned problem. In this fixed type constant velocity universal joint, when a fitting part with a mounting flange member is formed at one end in the axial direction of the outer joint member, a seal member is installed to seal between the outer joint member and the inner joint member. An annular spacer is disposed between the seal fixing member and the mounting flange member, and is held by a seal fixing member fixed to the other axial end of the outer joint member, and covers the outer periphery of the outer joint member. Therefore, by interconnecting the outer joint member, the seal fixing member, and the mounting flange member with bolts, the spacer disposed on the outer periphery of the outer joint member can be axially connected to the seal fixing member and the mounting flange member. It will be in a clamped and fixed state.

JP2019-138420A

However, when adopting a structure that seals the fitting portion between the outer joint member and the mounting flange member as in Patent Document 1, the number of parts for sealing increases, the number of installation steps increases, costs increase, and work efficiency decreases. This leads to a decline in overall productivity. In addition, since the contact area between the end face of the spacer and the end face of the mounting flange member is very short in the radial direction, it is important to locate this contact area immediately outside the fitting part from the viewpoint of ensuring sealing performance. This is not a desirable form. Patent Document 1 describes that an annular cover is press-fitted and fixed to the outer periphery of the spacer so as to span the contact area between the end face of the spacer and the end face of the mounting flange member. Since this further increases the number of parts required, it should be avoided from the above-mentioned viewpoint of productivity.

In view of the above-mentioned circumstances, the technical problem to be solved by the present invention is to provide a fixed constant-velocity type that can exhibit excellent sealing performance with fewer parts than before, even when designed to handle high loads. Our goal is to provide universal joints.

The solution to the above problem is achieved by a fixed constant velocity universal joint according to the present invention. That is, this joint includes an outer joint member, an inner joint member, a plurality of torque transmission members disposed between the outer joint member and the inner joint member, a holding member that holds the plurality of torque transmission members, The shaft connecting member connects the torque transmission shaft to the outer joint member, and the seal portion seals between the outer joint member and the inner joint member. In a fixed type constant velocity universal joint, which has a boot mounting member to which the radial end is mounted, and a shaft connecting member is fitted and fixed to the outer periphery of the outer joint member, the other end in the axial direction of the boot mounting member A first flange is provided, a fitting portion that fits with the outer periphery of the outer joint member is provided on one axial end side of the shaft connecting member, and a second flange is provided on the radially outer side of the fitting portion; It is characterized in that the first flange part and the second flange part are connected to each other with their end surfaces in contact with each other.

In this way, in the present invention, a flange (first flange) is provided on the other axial end of the existing boot mounting member, and a fitting portion is provided on the axial one end of the existing shaft connecting member. A flange (second flange) is provided on the outside in the radial direction, and the first flange and the second flange are interconnected with their end surfaces in contact with each other. By adopting such a connection structure, the outer joint member and the shaft connection member can be connected from the annular space between the outer joint member and the inner joint member using the existing members (boot, boot attachment member, shaft connection member). A wide range up to the mating area can be sealed. In addition, if the flanges are connected, the contact area of the end face can be made longer in the radial direction than in the conventional configuration (contact structure between the spacer and the mounting flange member), so this contact area has good sealing properties. There is no need to worry about it becoming a factor in the decline of Further, since the fitting region can be sealed by the boot mounting member and the shaft connecting member, the number of parts required for the sealing structure of the fitting region can be reduced compared to the conventional art. This makes it possible to improve productivity, including reduction in man-hours and cost. As described above, according to the present invention, it is possible to provide a fixed constant velocity universal joint that can handle high loads and has excellent productivity while ensuring sufficient sealing performance between the outer joint member and the shaft connecting member. It becomes possible.

In addition, in the fixed constant velocity universal joint according to the present invention, the first flange and the second flange may be connected to each other with the boot mounting member abutting one end face of the outer joint member from one axial side and the shaft connecting member abutting the other end face of the outer joint member from the other axial side.

In this way, by having a structure in which both the boot mounting member and the shaft connecting member can come into contact with the outer joint member in the axial direction, the first flange portion and the second flange portion can be easily positioned in the axial direction. As a result, work efficiency can be improved. Further, by connecting the flanges to each other in a state in which they are in contact with the outer joint member in the axial direction, it is possible to enjoy the advantage that the posture of each member is stabilized when connected.

Furthermore, in the fixed constant velocity universal joint according to the present invention, an accommodation groove capable of accommodating the annular elastic body is formed in the end face of one of the first and second collar parts, and The elastic body may be accommodated in the accommodation groove in close contact with the end surface of the flange.

In this way, by providing a housing groove on one end face of the flange and housing the elastic body in the housing groove in close contact with the other end face, the sealing performance of the end face contact area is further improved. be able to.

In addition, in the fixed constant velocity universal joint according to the present invention, a gasket layer formed by solidifying a liquid gasket may be interposed between the end face of the first flange and the end face of the second flange.

By providing a gasket layer formed by solidifying a liquid gasket between both end faces in this manner, the sealing performance of the end face contact area can be further improved. Of course, by providing a gasket layer in addition to the above-described adhesive structure of the elastic body, further improvement in sealing performance can be expected.

Furthermore, in the fixed constant velocity universal joint according to the present invention, the boot mounting member may have a cylindrical portion on the outer periphery of which the large-diameter end of the boot can be mounted on one end in the axial direction. In addition, in the case where the fixed constant velocity universal joint according to the present invention has a cylindrical portion, the large-diameter end of the boot is fastened to the outer peripheral surface of the cylindrical portion with a band, and is connected to the inner joint member. The smaller diameter end of the boot may be fastened to the outer peripheral surface of the torque transmitting shaft with a band.

By providing a cylindrical part to which the large-diameter end of the boot can be attached to the outer periphery in this way, the existing means for firmly and easily fixing one end of the boot, such as a boot band, can be applied. It becomes possible to do so.

Furthermore, in the fixed constant velocity universal joint according to the present invention, the boot has a curved portion that connects to the small diameter end of the boot and is curved in a direction that projects toward the other side in the axial direction, and a curved portion that connects with the curved portion and projects toward the other side in the axial direction. It may also have a folded part that is folded back in the direction of the fold.

According to the boot band having a shape having a curved portion and a folded portion as described above, it is possible to cope with expansion during rotation without any problem.

In addition, when the boot has a folded portion, the fixed constant velocity universal joint according to the present invention has the folded portion and the large diameter side end on the outer periphery of the folded portion and the large diameter side end of the boot connected to the folded portion. A metal ring cover may be attached.

When applying a boot with a curved part and a folded part as described above to this type of constant velocity universal joint, especially when applying it to high-speed rotation applications, the folded part located on the largest diameter side (outer diameter side) Deformation may be a concern. Here, by providing a metal ring cover on the outer periphery of the folded part and the large diameter end of the boot connected to the folded part as in this configuration, the folded part is supported from the outer circumferential side thereof. Therefore, even during high-speed rotation, it is possible to suppress deformation caused by centrifugal force and maintain the performance of the boot.

In addition, the fixed constant velocity universal joint according to the above explanation can exhibit excellent sealing performance with fewer parts than conventional ones, so for example, the shaft connecting member and the outer joint member are connected by tooth surface fitting. Even when the sealing performance of the fitting portion is more important, such as when the fittings are fitted and fixed to each other, it can be suitably used.

As described above, according to the present invention, it is possible to provide a fixed type constant velocity universal joint that can exhibit excellent sealing performance with fewer parts than conventional ones even when it is designed to handle high loads. It becomes possible.

FIG. 1 is a sectional view including the center axis of a fixed constant velocity universal joint according to an embodiment of the present invention. 2 is a cross-sectional view of the fixed type constant velocity universal joint shown in FIG. 1 along the line AA.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a sectional view of a fixed constant velocity universal joint 10 according to an embodiment of the present invention. As shown in FIG. 1, this fixed constant velocity universal joint 10 is used by being incorporated into, for example, various industrial machines, more specifically, driving force transmission devices used in harsh environments such as steel equipment. An outer joint member 11, an inner joint member 12 disposed inside the outer joint member 11, and a plurality of torque transmitting members disposed between the outer joint member 11 and the inner joint member 12. The ball 13 is provided with a cage 14 as a holding member that holds the plurality of balls 13.

A plurality of outer track grooves 15 extending along the axial direction are formed on the inner surface of the outer joint member 11 at equal intervals along the circumferential direction. Further, on the outer surface of the inner joint member 12, a plurality of inner track grooves 16 are formed at equal intervals along the circumferential direction, facing the outer track grooves 15 in the radial direction and extending along the axial direction.

A plurality of balls 13 serving as torque transmitting members are housed in a plurality of pockets 17 formed in the cage 14, and are arranged at equal intervals along the circumferential direction. Therefore, in this case, the cage 14 is arranged in the annular space between the inner surface of the outer joint member 11 and the outer surface of the inner joint member 12. The number of outer track grooves 15 and inner track grooves 16 that face each other in the radial direction, and the number of balls 13 can be set to any number, such as 6, 8, or 10, for example.

The bottom surface of the outer track groove 15 has an arc shape that curves convexly outward along the axial direction as shown in FIG. 1. The bottom surface of the outer track groove 15 also has an arc shape in cross section in the circumferential direction so as to fit along the outer peripheral surface of the ball 13 as shown in FIG. 2.

As shown in FIG. 1, the bottom surface of the inner track groove 16 has an arcuate shape that curves convexly in the outer radial direction along the axial direction. Further, as shown in FIG. 2, the bottom surface of the inner track groove 16 also has an arcuate cross section in the circumferential direction along the outer peripheral surface of the ball 13.

The center b of the track groove on the inner surface of the outer joint member 11 and the center a of the track groove on the outer surface of the inner joint member 12 are oppositely shifted from the joint center o by the same distance in the axial direction, as shown in FIG. set in position. Therefore, with the fixed constant velocity universal joint 10 in between, the outer joint member 11 and During the angular displacement of the inner joint member 12, the balls 13 housed in the pockets 17 of the cage 14 are always maintained within the bisector of the working angle at any working angle. This ensures constant velocity during rotation transmission of the fixed type constant velocity universal joint 10. Note that "one axial side" here corresponds to the left side in FIG. 1, and "the other axial side" corresponds to the right side in FIG. 1. "One axial end (side)" in the following description also corresponds to the left side in FIG. 1, and "the other axial end (side)" also corresponds to the right side in FIG. 1.

A shaft connecting member 19 (also referred to as a mounting flange member) for connecting a torque transmitting shaft (not shown) to the outer joint member 11 is provided on a portion of the outer periphery of the outer joint member 11 that includes at least the other end in the axial direction. are fixed by fitting. The shaft connecting member 19 is provided with a hollow shaft insertion portion 20 at its radial center position, and by attaching the above-mentioned torque transmission shaft at the other end in the axial direction to this shaft insertion portion 20, the shaft The torque transmitting shaft on one side in the direction, the shaft connecting member 19, and the outer joint member 11 are in a state where they can rotate together.

Further, the shaft connecting member 19 has a fitting portion 21 that can fit with the outer periphery of the outer joint member 11 at one end in the axial direction, and a first flange portion 45, which will be described later, on the outside in the radial direction of the fitting portion 21. It has a second flange portion 22 that can be connected. In this embodiment, the shaft insertion part 20, the fitting part 21, and the second flange part 22 are integrally formed.

Furthermore, in this embodiment, a plurality of recesses 23 are provided on the outer periphery of the other axial end of the outer joint member 11 at equal intervals along the circumferential direction (see FIG. 2). Each recess 23 has a constant dimension in the axial direction as shown in FIG. 1 (see FIG. 1). On the other hand, the fitting portion 21 of the shaft connecting member 19 is provided with a plurality of convex portions 24 formed at equal intervals along the circumferential direction (see FIG. 2). Each convex portion 24 has constant dimensions in the axial direction in FIG. 1 (see FIG. 1). These plurality of concave portions 23 and convex portions 24 are adapted to fit into each other. In other words, the outer joint member 11 and the shaft connecting member 19 are connected to each other by tooth surface fitting. In this case, the input torque is transmitted between the outer joint member 11 and the shaft connecting member 19 via the tooth surfaces (side surfaces of the recess 23 and the protrusion 24) that fit together, and as a result, high load handling is possible. It is possible.

Note that the form of tooth surface fitting is not limited to the form shown. The shape, size, arrangement, etc. of each recess 23 and each projection 24 can be arbitrarily set as long as the recess 23 and the projection 24 fit together in a tooth-surface fit. Alternatively, although not shown in the diagram, if the specification is such that high loads are not applied, friction can be transmitted between the abutting surfaces by bolting with a normal clearance fit between cylindrical surfaces instead of tooth surface fitting. I don't mind.

A shaft hole 25 extending in the axial direction is formed at the radial center of the inner joint member 12. The torque transmission shaft 18 on one axial side is attached to this shaft hole 25, so that the torque transmission shaft 18 on one axial side and the inner joint member 12 can rotate together. The torque transmission shaft 18 is fixed to the inner joint member 12 by a shaft stopper plate 26, a stop ring 53, a bolt 27, a washer 28, etc. to prevent it from coming off. In this embodiment, the torque transmission shaft 18 on one axial side and the inner joint member 12 are connected to each other by spline fitting (see Figure 2), but of course other connection structures may be used.

In addition, in the fixed constant velocity universal joint 10 having the above configuration, a lubricant (grease, etc.) is sealed in the inner space of the outer joint member 11 to ensure lubrication at the sliding parts inside the joint during operation. In this embodiment, an injection port 29 is provided in the shaft connecting member 19, and a lubricant such as grease is supplied through this injection port 29 to the inner space of the shaft connecting member 19 and the inner space of the outer joint member 11 that is continuous with this inner space. In addition, in order to prevent leakage of the lubricant sealed in the inner space of the outer joint member 11 and to prevent the intrusion of foreign matter from the outside, the fixed constant velocity universal joint 10 further includes a first seal portion 30 that seals (hermetically seals) one axial end side of the annular space between the outer joint member 11 and the inner joint member 12. This first seal portion 30 corresponds to the seal portion according to the present invention.

The first seal portion 30 includes a boot 31 made of, for example, rubber, and a boot attachment member 33 to which the large-diameter end portion 32 of the boot 31 is attached at one end in the axial direction.

The boot 31 has an annular shape as a whole, and has a large diameter end 32 on the outermost side and a small diameter end 34 on the innermost side. The boot 31 also includes a curved portion 35 that is connected to the small-diameter end portion 34 and curved in a direction that projects toward the other side in the axial direction, and a folded portion that is connected to the curved portion 35 and is folded back in a direction that projects toward one side in the axial direction. 36. In this case, the large diameter end 32 and the folded part 36 are connected, the folded part 36 and the curved part 35 are connected, and the curved part 35 and the small diameter end 34 are connected. , the small diameter side end portion 34, the curved portion 35, and the folded portion 36 are integrally formed.

The large diameter end 32 of the boot 31 is attached to a boot mounting member 33, and the small diameter end 34 is attached to the outer periphery of the torque transmission shaft 18 on one side in the axial direction. In this embodiment, the boot mounting member 33 is provided with a first cylindrical portion 37 to which the large-diameter end portion 32 of the boot 31 can be attached on the outer periphery (see FIG. 1), and this first cylindrical portion 37, the large diameter end portion 32 is attached. This first cylindrical portion 37 corresponds to the cylindrical portion according to the present invention. Further, in this embodiment, a first boot mounting groove 38 is formed on the outer peripheral surface of the first cylindrical portion 37, and a second boot mounting groove 39 is formed on the outer peripheral surface of the torque transmission shaft 18. The large diameter side end 32 is fastened and fixed to the first boot mounting groove 38 with a first boot band 40, and the small diameter side end 34 is fastened and fixed to the second boot mounting groove 39 with a second boot band 41. .

Further, in this embodiment, a metal ring cover 42 is attached to the outer periphery of the folded portion 36 and the large diameter end portion 32. In particular, a metal ring cover 42 is attached to cover the outer peripheral side of one axial end of the folded portion 36. In this embodiment, the large-diameter end portion 32 of the first boot band 40 is fastened and fixed to the first boot mounting groove 38 via the metal ring cover 42 . That is, the metal ring cover 42 is fixed to the large diameter end portion 32 by the first boot band 40 .

The boot mounting member 33 includes the first cylindrical portion 37 described above, a plate-shaped ring portion 43, a second cylindrical portion 44, and a first collar portion 45. Here, the first cylindrical portion 37 extends from the ring portion 43 to one side in the axial direction, and the second cylindrical portion 44 extends from the ring portion 43 to the other side in the axial direction. The second cylindrical part 44 is located radially outward from the first cylindrical part 37, and the first flange 45 extends radially outward from the other axial end of the second cylindrical part 44. ing.

Next, the dimensional relationship between the boot mounting member 33, the outer joint member 11, and the shaft connecting member 19 will be described. In this embodiment, the end surface of the ring portion 43 on the other axial side is brought into contact with the end surface of the outer joint member 11 on the one side in the axial direction, and the shaft connecting member 19 is brought into contact with the end surface of the outer joint member 11 on the other side in the axial direction. The boot mounting member 33, the outer joint member 11, and the shaft coupling are arranged so that the first flange 45 of the boot mounting member 33 and the second flange 22 of the shaft coupling member 19 abut in the axial direction when they are in contact with each other. The axial position and dimensions of each member 19 are set.

The boot mounting member 33 having the above configuration is connected to the shaft connecting member 19 by a bolt 46. Specifically, a plurality of bolt holes 47 are provided at equal intervals in the circumferential direction in the first flange 45 of the boot mounting member 33, and bolt holes 48 are provided at equal intervals in the circumferential direction in the second flange 22 of the shaft connecting member 19 (see FIG. 2). The first flange 45 and the second flange 22 are abutted in the axial direction with the circumferential and radial positions of the bolt holes 47, 48 aligned, and the bolts 46 are inserted into the bolt holes 47, 48, whereby the first flange 45 and the second flange 22 are fastened by the bolts 46, and the boot mounting member 33 having the first flange 45 and the shaft connecting member 19 having the second flange 22 are mutually connected. As a result, the fitting area between the outer joint member 11 and the shaft connecting member 19 is sealed. In this case, the boot mounting member 33, the shaft connecting member 19, and the bolt 46 form a second seal portion 49 that seals the fitting area between the outer joint member 11 and the shaft connecting member 19. In the illustrated example, a hard lock nut 50 is attached to the other axial end of the bolt 46 to strengthen the fastening force.

In addition, in this embodiment, an annular accommodation groove 52 capable of accommodating an annular elastic body 51 is provided on the end face of the first flange 45 facing the second flange 22. By accommodating the elastic body 51 in this accommodation groove 52 and fastening the first flange 45 and the second flange 22 with the bolt 46, the elastic body 51 deforms and comes into close contact with the surface of the accommodation groove 52 and the end face of the second flange 22. This further improves the sealing performance in the contact area between the first flange 45 and the second flange 22.

Although not clearly shown in FIG. 1, a gasket layer formed by solidifying a liquid gasket may be interposed between the end surfaces of the first flange 45 and the second flange 22 that face each other. Specifically, a liquid gasket is prepared by applying and solidifying the liquid gasket to the end face of one of the flange portions 45 (22) in advance. After that, as described above, by bringing the first flange 45 and the second flange 22 into axial contact and fastening them with the bolts 46, the gasket layer is brought into close contact with the end surfaces of both the flange 45, 22. In this state, it is interposed between both end faces.

As described above, according to the fixed constant velocity universal joint 10 according to the present embodiment, the first flange portion 45 is provided on the other axial end side of the boot mounting member 33, and the first flange portion 45 is provided on the other axial end side of the shaft connecting member 19. A second flange 22 is provided on the radially outer side of the fitting portion 21 provided on the side, and the first flange 45 and the second flange 22 are fastened with bolts 46 with their end surfaces in contact with each other. The structure is interconnected. By adopting such a connection structure, the outer joint member 11 can be removed from the annular space between the outer joint member 11 and the inner joint member 12 using the existing members (boot 31, boot mounting member 33, shaft connecting member 19). It is possible to seal a wide range up to the fitting area between the shaft connecting member 19 and the shaft connecting member 19. Furthermore, if the flanges 45 and 22 are connected to each other, the contact area of the end surfaces can be made longer in the radial direction than in the conventional configuration (the contact structure between the spacer and the mounting flange member described in Patent Document 1). Therefore, there is no fear that this contact area will cause a reduction in sealing performance. Further, since the boot mounting member 33 and the shaft connecting member 19 can seal the fitting area, the number of parts required for the sealing structure (second seal portion 49) of the fitting area can be reduced compared to the conventional case. This makes it possible to improve productivity, including reduction in man-hours and cost. As described above, the fixed constant velocity universal joint 10 according to the present embodiment can handle high loads with excellent productivity while ensuring sufficient sealing performance between the outer joint member 11 and the shaft connecting member 19. It becomes possible to provide the fixed constant velocity universal joint 10 according to the specifications.

In addition, in this embodiment, the first flange 45 and the second flange 22 are connected to each other with the boot mounting member 33 abutting against one end face of the outer joint member 11 from one axial side and the shaft connecting member 19 abutting against the other end face of the outer joint member 11 from the other axial side, so that the axial positioning of the first flange 45 and the second flange 22 can be easily performed, improving work efficiency. In addition, by connecting the flanges 45, 22 to each other with the boot mounting member 33 and the shaft connecting member 19 abutting against the outer joint member 11 in the axial direction, the posture of the boot mounting member 33 and the shaft connecting member 19 when connected is easily stabilized.

Furthermore, in this embodiment, the accommodation groove 52 in which the annular elastic body 51 can be accommodated is formed in the end face of the first flange 45, and the elastic body 51 is inserted into the accommodation groove in a state in close contact with the end face of the second flange 22. It was made to be accommodated in 52. By adopting a configuration in which the elastic body 51 is accommodated in the accommodation groove 52 in this manner, the sealing performance of the end face contact area can be further improved. Note that even if the accommodation groove 52 is provided, the contact area between the flanges 45 and 22 can be easily ensured, so there is no risk of adversely affecting the connection strength between the flanges 45 and 22.

Although one embodiment of the present invention has been described above, the fixed constant velocity universal joint according to the present invention is not limited to the above-mentioned exemplified form, and may take any form within the scope of the present invention.

For example, in the fixed constant velocity universal joint 10 shown in FIG. 1, the outer circumferential surface of the outer joint member 11 may be guided by the inner circumferential surface of the second cylindrical portion 44 of the boot mounting member 33. With such a structure, the outer joint member 11 is introduced into the inner periphery of the second cylindrical portion 44 with positioning in the radial direction and circumferential direction, so that the bolts between the flanges 45 and 22 mentioned above are Coupled with the centering effect of 46 fastening, it becomes possible to effectively suppress runout during high speed rotation.

For example, in the above embodiment, the axial abutting position of the first flange 45 and the second flange 22 is set to one axial end position of the fitting area between the recess 23 and the protrusion 24 that engage in tooth surface fitting with each other ( Although the example is shown in which the position substantially coincides with the position of one end in the axial direction of the convex portion 24, the present invention is not limited to this, of course. For example, although not shown, the axial contact position of the flanges 45 and 22 may be shifted to one side or the other side in the axial direction with respect to one axial end position of the fitting region between the recess 23 and the protrusion 24. good.

Further, in this embodiment, the case where the large diameter side end portion 32 of the boot 31 is attached to the outer periphery of the first cylindrical portion 37 of the boot attachment member 33 is illustrated, but it is of course possible to adopt other configurations. be. For example, although not shown, a metal ring may be attached to the large-diameter end 32 of the boot 31, and this metal ring may be fitted and fixed (press-fitted) to the inner periphery of the first cylindrical portion 37. In short, as long as the large-diameter end 32 of the boot 31 is attached to the boot attachment member 33, the forms of the boot 31 and the boot attachment member 33 are arbitrary.

10 Fixed type constant velocity universal joint 11 Outer joint member 12 Inner joint member 13 Ball 14 Cage 15 Outer track groove 16 Inner track groove 17 Pocket 18 Torque transmission shaft 19 Shaft connecting member 20 Shaft insertion portion 21 Fitting portion 22 Second flange portion 23 Recessed portion 24 Convex portion 25 Shaft hole 26 Shaft stopper plate, 53 Retaining ring 27 Bolt 28 Washer 29 Inlet 30 First seal portion 31 Boot 32 Large diameter side end portion 33 Boot mounting member 34 Small diameter side end portion 35 Curved portion 36 Folded portion 37 First cylindrical portion 38 First boot mounting groove 39 Second boot mounting groove 40 First boot band 41 Second boot band 42 Metal ring cover 43 Ring portion 44 Second cylindrical portion 45 First flange portion 46 Bolts 47, 48 Bolt hole 49 Second seal portion 50 Hard lock nut 51 Elastic body 52 Housing groove 53 Retaining ring

Claims (9)

an outer joint member, an inner joint member, a plurality of torque transmission members disposed between the outer joint member and the inner joint member, a holding member that holds the plurality of torque transmission members, and the outer joint member. A shaft connection member that connects a torque transmission shaft to the member, and a seal portion that seals between the outer joint member and the inner joint member,
The seal portion includes a boot and a boot mounting member to which a large-diameter end portion of the boot is mounted on one axial end side, and the shaft connecting member is fitted and fixed to the outer periphery of the outer joint member. In fixed constant velocity universal joints,
A first flange is provided on the other axial end side of the boot mounting member,
A fitting portion that fits with the outer periphery of the outer joint member is provided on one axial end side of the shaft connecting member, and a second collar portion is provided on the radially outer side of the fitting portion,
A fixed constant velocity universal joint, characterized in that the first flange and the second flange are connected to each other with their end surfaces in contact with each other. The fixed constant velocity universal joint according to claim 1, in which the first flange and the second flange are connected to each other with the boot mounting member abutting against one end face of the outer joint member from one axial side and the shaft connecting member abutting against the other end face of the outer joint member from the other axial side. A housing groove capable of accommodating an annular elastic body is formed in the end face of one of the first and second flanges, and the elastic body is in close contact with the end face of the other collar. The fixed type constant velocity universal joint according to claim 1 or 2, wherein the fixed type constant velocity universal joint is accommodated in the accommodation groove. The fixed type constant velocity universal joint according to claim 1 or 2, wherein a gasket layer formed by solidifying a liquid gasket is interposed between an end surface of the first flange and an end surface of the second flange. The fixed constant velocity universal joint according to claim 1 or 2, wherein the boot mounting member has a cylindrical portion on the outer periphery of which the large-diameter end of the boot can be mounted, on one axial end side. The fixed constant velocity universal joint according to claim 5, wherein the large diameter end of the boot is fastened with a band to the outer circumferential surface of the cylindrical portion, and the small diameter end of the boot is fastened with the band to the outer circumferential surface of the torque transmission shaft connected to the inner joint member. The fixed constant velocity universal joint according to claim 1 or 2, wherein the boot has a curved portion that is connected to the small diameter end of the boot and curved in a direction that protrudes to the other side in the axial direction, and a folded portion that is connected to the curved portion and folded back in a direction that protrudes to one side in the axial direction. The fixed type etc. according to claim 7, wherein a metal ring cover that covers the folded part and the large diameter end is attached to the outer periphery of the folded part and the large diameter end of the boot connected to the folded part. Quick universal joint. The fixed constant velocity universal joint according to claim 1 or 2, wherein the shaft connecting member and the outer joint member are fitted and fixed to each other by tooth surface fitting.

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