JP2018035818A - Cross groove type constant-velocity universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cross groove type constant velocity universal joint capable of suppressing flowing out of a lubricant near a ball in sliding and high-speed rotation even when a small amount of lubricant is sealed, and preventing degradation of NVH and reduction of a service life.SOLUTION: A cross groove type constant-velocity universal joint includes an inner joint member on which ball grooves inclined in directions opposite to each other with respect to an axis, are alternately formed on an outer peripheral face in a circumferential direction, an outer joint member on which ball grooves inclined in directions opposite to each other with respect to the axis, are alternately formed on an inner peripheral face in the circumferential direction, a plurality of torque transmission balls incorporated in an intersecting portion of paired ball grooves of the inner joint member and ball grooves of the outer joint member, and a cage having a window portion disposed between the outer peripheral face of the inner joint member and the inner peripheral face of the outer joint member, and holding the torque transmission balls at prescribed intervals in the circumferential direction. A flexible structure composed of a fiber material, a soft foamed material or a soft resin material is disposed on a region excluding the outer joint member, the inner joint member, and a contact portion of the cage and the ball.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cross groove type constant velocity universal joint used in a power transmission device of an automobile or various industrial machines.

  As shown in FIGS. 12 and 14, the cross groove type constant velocity universal joint (see Patent Document 1 and Patent Document 2, etc.) has a ball groove 2 (2a) inclined on the outer peripheral surface 1 in directions opposite to each other with respect to the axis. 2b) (see FIG. 13), the inner joint member 3 formed alternately in the circumferential direction, and the ball grooves 5 (5a, 5b) inclined in the opposite directions to the axis on the inner peripheral surface 4 (see FIG. 13). ) Are alternately formed in the circumferential direction, and a plurality of pieces are incorporated at the intersections of the ball grooves 2a and 2b of the paired inner joint member 3 and the ball grooves 5a and 5b of the outer joint member 6. A torque transmission ball 7 and a cage 8 that is interposed between the outer peripheral surface 1 of the inner joint member 3 and the inner peripheral surface 4 of the outer joint member 6 and holds the torque transmission ball 7 at a predetermined interval in the circumferential direction. .

  A shaft 10 is inserted into a center hole (inner diameter hole) 9 of the inner joint member 3 and is spline-fitted, and torque can be transmitted between the two by the spline fitting. Further, a retaining ring 20 is attached to the end portion of the male spline 10a of the shaft 10, and the removal of the shaft 10 is described. The cage 8 is provided with a window portion 11, and the ball 7 is supported by the window portion 11.

  An end cap 12 is fitted on one end side of the outer joint member 6 in the axial direction (an opening on the opposite shaft protruding side), and an outer ring opening on the shaft protruding side is closed by a sealing device 13. The sealing device 13 includes a metal adapter 14 attached to the outer joint member 6 and a rubber boot 15 disposed between the adapter 14 and the shaft 10. A bolt member (not shown) is mounted on the outer joint member 6, and the metal adapter 14 and the end cap 12 of the sealing device 13 are supported by the outer joint member 6 by mounting the bolt member.

  The boot 15 includes a small end portion 15b, a large end portion 15a, and a V-shaped or U-shaped folded portion 15c that connects the small end portion 15b and the large end portion 15a. The metal adapter 14 includes a cylindrical main body portion 14c and a large-diameter cylindrical portion 14a that is connected to the main body portion 14c via a ring-shaped flat plate 14b and is fitted onto the outer joint member 6. . A small end portion 15 b of the boot 15 is attached to the shaft 10 and fastened with a boot band 16. The large end portion 15 a of the boot 15 is held by crimping the end portion of the main body portion 14 c of the metal adapter 14.

The end cap 12 is a ring-shaped flat plate in which a cylindrical portion 12a that is externally fitted to the outer joint member 6, a deep dish-like member 12c that bulges to the opposite joint side, and a cylindrical portion 12a and a deep-plate-like member 12c. 12b. A bolt member (not shown) is attached to the outer joint member 6, and the metal adapter 14 and the end cap 12 of the sealing device 13 are supported by the outer joint member 6 by the attachment of the bolt member. That is, the ring-shaped flat plate 12 b of the end cap 12 and the ring-shaped flat plate 14 b of the adapter 14 are provided with through holes 17 and 18, respectively, and the outer joint member 6 is provided with a through hole 19. And a bolt member is inserted in the through-hole 19.

  FIG. 13 is a development view of the ball grooves 2a, 2b, 5a, and 5b, and shows the intersection angle β of each ball groove 2a, 2b, 5a, and 5b with respect to the axis.

  There are two types of cross-groove type constant velocity universal joints, a float type and a non-float type, depending on the difference in the axial displacement regulating mechanism (stopper). In the float type, axial displacement is regulated by interference between the inner joint member and the cage. That is, in the float type, as shown in FIG. 12, the maximum outer diameter of the inner joint member 3 is set larger than the minimum inner diameter of the cage 8, and the axial displacement is regulated by the interference between the inner joint member 3 and the cage 8. I have to.

  In the non-float type, as shown in FIG. 14, the maximum outer diameter of the inner joint member 3 is set smaller than the minimum inner diameter of the cage 8 so that the axial displacement can be increased. The axial displacement is restricted.

JP 2009-250351 A JP 2009-191901 A

  In the cross groove type constant velocity universal joint, the amount of lubricant filled in the joint is set in consideration of the durability of the ball contact portion. However, when the operating angle is taken, deviation occurs in the space inside the joint. When this cross groove type constant velocity universal joint is used for a propeller shaft or the like that is used at high speed rotation, the unevenness of the lubricant appears remarkably. If the lubricant is biased, there may be a decrease in NVH (Noise, Vibration, Harshness) characteristics and life, and an increase in temperature due to poor lubrication.

  Therefore, it is necessary to enclose a lot of lubricant so as to fill the space inside the joint as much as possible. However, if a large amount of lubricant is sealed in this way, the assembly of the joint is lowered, the slide resistance is increased (the stirring resistance is increased due to the narrowed space), and the boot (sealing device) is not rotated. There was a risk of inviting.

  Therefore, the present invention can suppress the outflow of lubricant near the ball during sliding and high-speed rotation even with a small amount of lubricant enclosed, and prevent a decrease in NVH (Noise, Vibration, Harshness) and a decrease in life. A cross groove type constant velocity universal joint is provided.

  The cross groove type constant velocity universal joint of the present invention includes an inner joint member in which ball grooves inclined in opposite directions with respect to the axis are alternately formed on the outer peripheral surface, and an inner joint member on the inner peripheral surface with respect to the axis. A plurality of torque transmission balls incorporated at the intersection of the outer joint member in which the ball grooves inclined in the opposite direction are alternately formed in the circumferential direction and the ball groove of the paired inner joint member and the ball groove of the outer joint member And a cross-glove type constant velocity provided with a cage having a window portion that is interposed between the outer peripheral surface of the inner joint member and the inner peripheral surface of the outer joint member and holds the torque transmission balls at predetermined intervals in the circumferential direction. A universal joint, wherein a flexible structure made of a fiber material, a soft foam material, or a soft resin material is provided in addition to the contact portion between the outer joint member, the inner joint member, and the cage and the ball. .

  According to the cross groove type constant velocity universal joint of the present invention, the lubricant is held by the outer joint member, the inner joint member, and the flexible structure other than the contact portion between the cage and the ball. Moreover, since these portions are not so-called spherical contact portions, damage to the flexible structure can be prevented.

  Even if a flexible structure is provided on at least one of the inner diameter surface and the outer diameter surface of the cage, the flexible structure is provided on the inner surface of the window portion other than the ball contact portion of the cage window portion. Even if the flexible structure is provided on the entire surface of the cage window other than the ball contact portion, at least one of the outer peripheral surface of the inner joint member and the inner peripheral surface of the outer joint member is flexible. A structure may be provided.

  The flexible structure forming method of the present invention is a flexible structure forming method for forming a flexible structure, and the flexible structure is constituted by a fiber-planted portion in which short fibers of synthetic resin are planted. The flexible structure is formed by electrostatic spraying flocking in which short fibers are sprayed onto the adhesive layer by air, and the short fibers are inclined with respect to the forming surface of the flexible structure to adhere to the adhesive layer. is there.

  According to the flexible structure forming method of the present invention, the short fibers can be adhered to the adhesive layer while being inclined with respect to the surface on which the flexible structure is formed. For this reason, compared with electrostatic flocking, the flocking density decreases, and flocking can be performed with a small amount of short fibers. Here, electrostatic flocking is a technique in which an adhesive is applied to a processed material (planted member), an electrostatic field is created by a high voltage electrode, and short fibers are erected by the electrostatic attraction force.

The cross groove type constant velocity universal joint of the present invention can prevent the lubricant in the vicinity of the ball from flowing out by the flexible structure even when the operating angle is taken. For this reason, the ball is lubricated in a timely manner and has excellent durability as a joint. Moreover, it is not necessary to enclose a large amount of lubricant inside the joint, and the assembly and high-speed rotation of the joint are improved. That is, even when a small amount of lubricant is enclosed, it is possible to suppress the lubricant outflow near the ball during sliding and high-speed rotation, and to prevent a decrease in NVH (Noise, Vibration, Harshness) and a decrease in life. Furthermore, since it is not a part which contacts a spherical surface, damage to the flexible structure can be prevented. In particular, when the flexible structure is composed of fiber flocking parts,
It is possible to prevent the flocked fibers from coming out of the fiber flocked portion. That is, the cross-groove type constant velocity universal joint having excellent durability can be effectively prevented from coming off or passing through the flocked fibers of the fiber flocked portion.

It is sectional drawing of the cross groove type constant velocity universal joint of this invention. FIG. 2 is a cross-sectional view of the cross groove type constant velocity universal joint shown in FIG. FIG. 2 is a development view of a ball groove of the cross groove type constant velocity universal joint shown in FIG. 1. It is a perspective view of the inner joint member of the cross groove type constant velocity universal joint shown in FIG. It is a perspective view of the outer joint member of the cross groove type constant velocity universal joint shown in FIG. It is a perspective view of the 1st cage of the cross groove type constant velocity universal joint shown in FIG. It is a perspective view of the 2nd cage of the cross groove type constant velocity universal joint shown in FIG. It is a perspective view of the 3rd cage of the cross groove type constant velocity universal joint shown in FIG. It is a perspective view of the 4th cage of the cross groove type constant velocity universal joint shown in FIG. It is explanatory drawing of electrostatic flocking. A fiber flocking part is shown, (a) is an enlarged view at the time of forming by electrostatic flocking, (b) is an enlarged view at the time of forming by electrostatic spraying flocking. It is sectional drawing of a float type cross groove type constant velocity universal joint. FIG. 13 is a development view of a ball groove of the cross groove type constant velocity universal joint shown in FIG. 12. It is sectional drawing of a non-float type cross groove type constant velocity universal joint.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a constant velocity universal joint according to the present invention. This constant velocity universal joint is formed by circularly forming ball grooves 22 (22a, 22b) (see FIG. 3) inclined in directions opposite to each other on an outer peripheral surface 21 with respect to an axis. The inner joint members 23 formed alternately in the circumferential direction and the ball grooves 25 (25a, 25b) (see FIGS. 2 and 3) inclined in opposite directions with respect to the axis on the inner circumferential surface 24 are alternately arranged in the circumferential direction. A plurality of torque transmitting balls 27 incorporated at the intersection of the ball groove 22 of the inner joint member 23 and the ball groove 25 of the outer joint member 26, and the inner joint member 23. A cage 28 is provided between the outer peripheral surface 21 and the inner peripheral surface 24 of the outer joint member 26 and holds the torque transmission balls 27 at a predetermined interval in the circumferential direction.

  In FIG. 3, β indicates the crossing angle of each ball groove 22a, 22b, 25a, 25b with respect to the axis. The torque transmission ball 27 is incorporated at the intersection of each ball groove 22a, 22b, 25a, 25b.

  As shown in FIG. 1, a shaft 30 is inserted into a center hole (inner diameter hole) 29 of the inner joint member 23 so as to be fitted with a spline, and the torque can be transmitted between the two by the spline fitting. That is, a female spline 29 a is formed in the center hole 29 of the inner joint member 23, a male spline 30 a is formed at the shaft end of the shaft 30, and the shaft end of the shaft 30 is fitted into the center hole 29 of the inner joint member 23. Thus, the female spline 29a of the inner joint member 23 and the male spline 30a of the shaft 30 are fitted. A retaining ring 40 is attached to the end of the male spline 30a of the shaft 30 to prevent the shaft 30 from coming off.

  The cage 28 is provided with a window portion 31, and the ball 27 is held by the window portion 31. The window portion 31 is formed of an oval hole provided in the trunk portion of the cage 28. That is, as shown in FIGS. 6 to 9, the window portion 31 includes a pair of parallel facing surfaces 31 a and 31 a facing each other with a predetermined interval, and arcuate surfaces 31 b and 31 b provided at both ends of the facing surfaces 31 a and 31 a. It consists of.

  An end cap 32 is fitted on one end side of the outer joint member 26 in the axial direction (an opening on the opposite shaft protruding side), and an outer ring opening on the shaft protruding side is closed by a sealing device 33. The sealing device 33 includes a rubber or resin boot 35 and a metal adapter 34 made of metal.

  The boot 35 includes a small end portion 35b, a large end portion 35a, and a V-shaped or U-shaped folded portion 35c that connects the small end portion 35b and the large end portion 35a. The metal adapter 34 includes a cylindrical main body portion 34 c and a large-diameter cylindrical portion 34 a that is connected to the main body portion 34 c via a ring-shaped flat plate 34 b and is externally fitted to the outer joint member 26. . Further, the small end portion 35 b of the boot 35 is attached to the shaft 30 and fastened with a boot band 36. The large end 35 a of the boot 35 is held by crimping the end of the main body 34 c of the metal adapter 34.

  The end cap 32 has a cylindrical portion 32a fitted on the outer joint member 26, a deep dish-like member 32c that bulges to the anti-joint side, and a ring that continuously connects the cylindrical portion 32a and the deep-plate shaped member 32c. A flat plate 32b. A bolt member (not shown) is attached to the outer joint member 26, and the metal adapter 34 and the end cap 32 of the sealing device 33 are supported by the outer joint member 26 by the attachment of the bolt member. That is, the ring-shaped flat plate 32b of the end cap 32 and the ring-shaped flat plate 34b of the adapter 34 are provided with through holes 37 and 38, respectively, and the outer joint member 26 is provided with a through hole 39. And a bolt member is inserted in the through-hole 39.

  As shown in FIG. 4, the inner joint member 23 has a flexible structure 50 (50 </ b> A) formed on the outer peripheral surface 21, and the flexible structure 50 (50 </ b> A) is also formed on the inner peripheral surface 24 of the outer joint member 26. The flexible structure 50 is made of a fiber material, a soft foam material, or a soft resin material, and is made of a fiber material (short fiber: pile). It is formed at the flocked part.

  The fiber flocking portion that is the flexible structure 50 can be formed by electrostatic flocking. Examples of the electrostatic flocking process include an adhesive application process, an electrostatic flocking process, a drying process, and a finishing process. That is, as shown in FIG. 10, electrostatic flocking is performed by applying an adhesive to an object (base material) 51 to form an adhesive layer S, creating an electrostatic field with a high voltage electrode, and electrostatic attraction force. Then, the short fibers 52 are raised on the adhesive layer S, and then a drying process for drying the adhesive of the adhesive layer S is performed, and then a finishing process for removing hair and the like is performed.

  The electrostatic flocking process will be described in detail. As shown in FIG. 10, short fibers 52 that are cut to a predetermined size (the surface of which an electrolyte or surfactant film is formed, that is, electrodeposition treatment) The material coated with the agent is put in the vicinity of the high-voltage electrode 53. With this input, the short fiber 52 is attracted to the electrode by Coulomb force. For this reason, at the moment when the short fiber 52 touches the electrode 53, it is charged to the same potential as the electrode and is repelled by Coulomb force. Since the repelled short fibers 52 are given a high potential, they fly toward the ground side. At this time, since the adhesive S is applied to the surface 51a of the ground-side object 51, the short fibers 52 are pierced (thrown) into the adhesive S.

  The short fiber 52 is not particularly limited as long as it can be used as a short fiber for flocking. For example, (1) polyolefin resin such as polyethylene and polypropylene, polyamide resin such as nylon, aromatic polyamide resin, polyethylene terephthalate, polyethylene naphthalene Polyester resin such as phthalate, polyethylene succinate and polybutylene terephthalate, synthetic resin fiber such as acrylic resin, vinyl chloride and vinylon, (2) inorganic fiber such as carbon fiber and glass fiber, (3) regeneration of rayon and acetate Examples include fibers and natural fibers such as cotton, silk, hemp, and wool. These may be used independently and 2 or more types may be used together. It is preferable to use synthetic resin fiber among the above because it is difficult to cause swelling and dissolution with oil, is chemically stable, can produce a large amount of homogeneous fibers, and can be obtained at low cost.

  The shape of the short fiber is not particularly limited as long as it does not interfere with other members that adversely affect the constant velocity universal joint function at the place where the flocked portion is formed. As a specific shape, for example, those having a length of 0.5 to 2.0 mm and a thickness of 0.5 to 50 dtex are preferable, and the density of short fibers in the flocked portion is occupied by fibers per planted area. A ratio of 10 to 30% is preferable. There are straight and bend (shape where the tip is bent) as the shape of the short fiber, and the cross-sectional shape is circular or polygonal. The bend shape can hold the grease more strongly than the straight shape. By using the short fibers having a polygonal cross section, the surface area can be made larger than that of the short fibers having a circular cross section, and the surface tension of the lubricant can be increased. It is preferable to select the shape of the short fiber according to each characteristic.

  Examples of the adhesive include an adhesive mainly composed of urethane resin, epoxy resin, acrylic resin, vinyl acetate resin, polyimide resin, silicone resin and the like. For example, urethane resin solvent adhesive, epoxy resin solvent adhesive, vinyl acetate resin solvent adhesive, acrylic resin emulsion adhesive, acrylate-vinyl acetate copolymer emulsion adhesive, vinyl acetate emulsion adhesive , Urethane resin emulsion adhesive, epoxy resin emulsion adhesive, polyester emulsion adhesive, ethylene-vinyl acetate copolymer adhesive and the like. These may be used independently and 2 or more types may be used together.

  When electrostatic flocking is performed as described above, as shown in FIG. 11A, the short fibers 52 are stuck into the adhesive S applied to the surface 51 a of the object (base material) 51. In this case, as described above, it is usually thrown perpendicularly to the surface 51 a of the object (base material) 51.

  On the other hand, if electrostatic spraying is performed, the short fibers 52 can be fixed to the object (base material) 51 at a certain angle as shown in FIG. The electrostatic spraying flocking is based on substantially the same principle as the electrostatic flocking, and is for blowing air against the short fibers. That is, the short fibers are pierced into the adhesive from one end by an electrostatic suction force, and are fixed to the object (base material) 51 at a certain angle by the action of air. The inclination angle of the short fibers 52 with respect to the object (base material) 51 can be arbitrarily determined depending on the direction of air to be blown, the air volume, and the like.

  As shown to Fig.11 (a), the short fiber can cover the base-material surface of an area larger than the case where it stands upright. For this reason, the number of short fibers fixed per substrate surface can be reduced and the density can be reduced. That is, compared with electrostatic flocking, the flocking density is reduced, and flocking can be carried out with a small amount of short fibers. In mass production, the cost can be reduced by reducing the number of short fibers and shortening the time.

  Further, when the flexible structure 50 is made of a soft foam material or a soft resin material, a material that has been formed and processed in advance in a predetermined shape is adhered to the formation site of the flexible structure 50 with an adhesive or the like. do it.

  Soft foam materials are obtained by foaming synthetic resins such as polyurethane, polystyrene, polyolefin, phenol, and polyvinyl chloride, and rubbers such as natural rubber, chloroprene rubber, ethylene propylene rubber, nitrile rubber, silicon rubber, and styrene butadiene rubber. Foamed material. Examples of the soft resin material include cork materials, rubber plate materials, and soft sheets such as polyethylene and vinyl chloride. Moreover, as an adhesive agent when using a soft foam material or a soft resin material, the adhesive agent used when flocking the short fibers can be used. That is, it can be said that it is preferable to use a fiber material, a soft foam material, and a soft resin material that are excellent in lubricant retention, and use a fiber material. Among fiber materials, use of synthetic resin short fibers because they are chemically stable, resistant to swelling and dissolution by oil, can be produced in large quantities and can be obtained at low cost. Is preferred.

  If the inner joint member 23 as shown in FIG. 4 is used, the lubricant is held by the flexible structure 50 (50A). And since this site | part is not a site | part which is what is called a spherical contact, it can prevent the omission of the flocked fiber of a fiber flocking part.

  Further, when the outer joint member 26 as shown in FIG. 5 is used, the lubricant is held by the flexible structure 50 (50B). And since this site | part is not a site | part which is what is called a spherical contact, it can prevent the omission of the flocked fiber of a fiber flocking part.

  The cage 28 is preferably provided with a flexible structure 50 as shown in FIGS. In FIG. 6, the flexible structure 50 (50C) is provided only on the inner diameter surface 28b, and in FIG. 7, the flexible structure 50 (50D) is provided only on the outer diameter surface 28a.

  In FIG. 8, the flexible structure 50 (50E) is provided in the circular arc surfaces 31b and 31b of the window part 31. As shown in FIG. A step portion is provided between the facing surfaces 31a and 31a and the arcuate surfaces 31b and 31b, and the space between the facing surfaces 31a and 31a is wide. Then, the ball 27 is interposed between the facing surfaces 31a and 31a. For this reason, the flexible structure 50 is provided on the inner surface of the window portion excluding the ball-corresponding portion of the window portion 31 of the cage 28, so that the ball 27 does not contact the flexible structure 50.

  Further, the cage 28 shown in FIG. 9 has a flexible structure 50 provided on the entire surface thereof. Here, the whole surface is the circular arc surfaces 31b and 31b of the window portion 31, the cage outer diameter surface 28a, and the cage inner diameter surface 28b. Also in this case, the flexible structure 50 is provided on the inner surface of the window portion excluding the ball-corresponding portion of the window portion of the cage 28 by omitting the flexible structure 50 of the facing surfaces 31a and 31a of the window portion 31. Thus, the ball 27 is configured not to contact the flexible structure 50.

  Thus, in the cross groove type constant velocity universal joint of the present invention, the flexible joint 50 is provided in addition to the outer joint member 26, the inner joint member 23, and the contact portion between the cage 28 and the ball 27, that is, the cage 28. At least one portion selected from an inner diameter surface 28b of the cage 28, an outer diameter surface 28b of the cage 28, an inner circumference surface of the window 31 of the cage 28, an outer circumference surface 21 of the inner joint member 23, and an inner circumference surface 24 of the outer joint member 26. Since the flexible structure 50 is provided, the flexible structure 50 can prevent the lubricant in the vicinity of the ball from flowing out even when the operating angle θ is taken as shown in FIG. For this reason, the ball is lubricated in a timely manner and has excellent durability as a joint. Moreover, it is not necessary to enclose a large amount of lubricant inside the joint, and the assembly and high-speed rotation of the joint are improved. That is, even when a small amount of lubricant is enclosed, it is possible to suppress the lubricant outflow near the ball during sliding and high-speed rotation, and to prevent a decrease in NVH (Noise, Vibration, Harshness) and a decrease in life.

  Furthermore, since it is not a part which contacts a spherical surface, damage to the flexible structure can be prevented. In particular, when the flexible structure is constituted by a fiber flocked portion, it is possible to prevent the flocked fibers 52 from coming off the fiber flocked portion. That is, it is possible to effectively prevent detachment or passage of the flocked fibers 52 in the fiber flocked portion, and a cross groove type constant velocity universal joint having excellent durability is obtained.

  Further, if electrostatic spraying is carried out, the flocking density is reduced as compared with electrostatic flocking, and flocking with a small amount of fibers (short fibers) 52 is possible. For this reason, in the case of mass production, the cost can be reduced by reducing the short fibers 52 and shortening the time.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made. It may be a float type. Further, the number of balls as the torque transmitting member is not limited to six, and the increase / decrease is arbitrary.

  For electrostatic flocking, different processing methods depending on the flying direction of the short fibers (pile) 52, that is, the up type (method of flying the pile from below), the down type (method of flying the pile from above) There are a side type (a method in which a pile is caused to fly in a horizontal direction) and an up-down type (a method in which an up type and a down type are combined at the same time), and any of these types may be used.

21 outer peripheral surfaces 22, 22a, 22b ball groove 23 inner joint member 24 inner peripheral surfaces 25, 25a, 25b ball groove 26 outer joint member 27 torque transmitting ball 28 cage 28a cage outer diameter surface 28b cage inner diameter surface 31 window portions 31a, 31a Opposing surface 31b Arc surface 32 End cap 50, 50A, 50B, 50C, 50D, 50E Flexible structure 51 Object 52 Short fiber S Adhesive

Claims (6)

Inner joint members in which ball grooves inclined in opposite directions with respect to the axis are formed on the outer peripheral surface alternately in the circumferential direction, and ball grooves inclined in directions opposite to each other on the inner peripheral surface in the circumferential direction Alternately formed outer joint members, a plurality of torque transmission balls incorporated at intersections of the ball grooves of the inner joint member and the ball grooves of the outer joint member, and the outer peripheral surface of the inner joint member and the outer joint member A cross-glove type constant velocity universal joint provided with a cage having a window portion which is interposed between the inner peripheral surface and holds the torque transmission ball at a predetermined interval in the circumferential direction,
In addition to the outer joint member, the inner joint member, and the contact portion between the cage and the ball, a cross-glove type characterized in that a flexible structure made of a fiber material, a soft foam material, or a soft resin material is provided. Fast universal joint.   The cross groove type constant velocity universal joint according to claim 1, wherein a flexible structure is provided on at least one of an inner diameter surface and an outer diameter surface of the cage.   The cross groove type constant velocity universal joint according to claim 1, wherein a flexible structure is provided on an inner surface of the window portion other than the ball contact portion of the window portion of the cage.   2. The cross groove type constant velocity universal joint according to claim 1, wherein a flexible structure is provided on the entire surface of the cage window other than the ball contact portion.   The cross-groove type constant velocity universal joint according to claim 1, wherein a flexible structure is provided on at least one of the outer peripheral surface of the inner joint member and the inner peripheral surface of the outer joint member. A flexible structure forming method for forming a flexible structure of a cross-glove type constant velocity universal joint according to any one of claims 1 to 5,
The flexible structure is composed of a fiber-planted portion in which short fibers of synthetic resin are planted, and the short fibers are sprayed onto the adhesive layer by air to incline the short fibers with respect to the surface on which the flexible structure is formed. And forming the flexible structure by electrostatic spraying flocking to adhere to the adhesive layer.

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