JP2010156353A - Boot for constant velocity joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boot for a constant velocity joint which prevents inner parts from falling off without causing a fall-off prevention member to break. <P>SOLUTION: A large diameter attachment portion 6 of the boot 1 includes a fall-off prevention portion 8 positioned at the inside circumference side of an outer ring 5 and a metal member 11 formed integrally at the arrangement position of the fall-off prevention portion 8. The metal member 11, which has a clip shape of roughly channel shape in the cross section in the axial direction of the constant velocity joint, has an outer portion fixed to the body of the large diameter attachment portion 6 and an inner portion fixed to the fall-off prevention portion 8. A projection portion 11a, which is fitted to a recessed portion provided on the outside circumferential surface of the outer ring 5, is provided at the tip of the outer portion of the metal member 11. The fall-off prevention portion 8 is reinforced by the inner portion of the metal member 11 formed integrally, so that damage can be prevented even when the slide of the inner parts to the opening end side of the outer ring 5 causes balls 10 to contact the fall-off prevention portion 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a constant velocity joint boot that is used in automobiles and various industrial machines and transmits rotational torque.

  In a power transmission device that transmits the rotational torque of an automobile engine to a wheel, the rotational torque is transmitted with the input shaft and the output shaft at an operating angle by constant velocity joints connected to both ends of the propeller shaft and the drive shaft. I am doing so. In some constant velocity joints, the other shaft is slidable in the axial direction with respect to one outer ring. Yes.

  FIG. 4 is a cross-sectional view showing a constant velocity joint in which a conventional inner part is prevented from falling off. The constant velocity joint includes a small diameter attachment portion 4 attached to the shaft member 2 at one end of a rubber or resin boot 100 and a large diameter attachment portion 6 attached to the outer ring 5 of the constant velocity joint at the other end. . A bellows portion 7 is provided between the attachment portions 4 and 6. On the inner peripheral side of the large-diameter attachment portion 6 of the boot 100, a wedge portion 108 that fits with the outer ring 5 and protrudes toward the depth of the outer ring is integrally formed. The wedge portion 108 is fitted in the guide groove 9 of the ball 10 provided on the inner peripheral surface of the outer ring 5, and when the inner part of the joint slides and the ball 10 is pulled toward the opening side of the outer ring 5, The ball 10 comes into contact with the slope of the wedge portion 108. Thus, the inconvenience that the ball 10 is detached from the end of the guide groove 9 and the inner part falls off from the opening of the outer ring 5 is prevented. The small-diameter attachment portion 4 and the large-diameter attachment portion 6 of the boot 100 are fixed to the shaft member 2 and the outer ring 5 by boot bands 101 and 102, respectively. As such a constant velocity joint, the one shown in Patent Document 1 is known.

Japanese Patent No. 3920940

  However, in such a conventional constant velocity joint with drop prevention, the wedge portion 108 is sandwiched between the ball 10 and the guide groove 9 when the ball 10 comes into contact with the slope of the wedge portion 108, and the wedge portion 108. There is a problem that breakage such as cracks occurs.

  Accordingly, an object of the present invention is to provide a boot for a constant velocity joint that can prevent an inner part from falling off without causing damage to a member that prevents the falling off.

  In order to solve the above-mentioned problem, the constant velocity joint boot of the invention of claim 1 includes a small diameter attachment portion attached to a shaft member of the constant velocity joint, a large diameter attachment portion attached to an outer ring of the constant velocity joint, and a small diameter attachment. The flexible part is located between the part and the large-diameter attaching part, and is formed in the flexible part capable of following the operating angle of the constant velocity joint, and provided on the large-diameter attaching part, on the inner peripheral side of the outer ring In a constant velocity joint boot provided with a drop-off preventing portion that is arranged and prevents the inner part from falling off the outer ring, a metal member is provided at least in the drop-off preventing portion of the large-diameter mounting portion.

  According to the constant velocity joint boot of claim 1, since the metal member is provided at least in the drop-off preventing portion of the large-diameter mounting portion, even if an inward member such as a ball contacts the drop-off preventing portion, the conventional etc. Like the fast joint boot, it is possible to prevent the wedge portion formed of the same flexible material as the boot from being damaged by being sandwiched between the ball and the outer ring.

  A constant velocity joint boot according to a second aspect of the present invention is the constant velocity joint boot according to the first aspect, wherein the metal member of the large-diameter mounting portion is integrally formed with the flexible member connected to the flexible portion. It is characterized by that.

  According to the constant velocity joint boot of claim 2, since the metal member of the large-diameter attachment portion is integrally formed with the flexible member connected to the flexible portion, the large-diameter attachment portion can be easily attached to the outer ring. And can effectively reinforce the drop-off prevention portion.

  A constant velocity joint boot according to a third aspect of the present invention is the constant velocity joint boot according to the first aspect, wherein the metal member of the large-diameter mounting portion can be fitted to the opening end of the outer ring. It is characterized by having.

  According to the constant velocity joint boot of claim 3, the strength of the large-diameter attachment portion can be increased, and the large-diameter attachment portion can be firmly attached to the opening end portion of the outer ring.

  According to a fourth aspect of the present invention, there is provided the constant velocity joint boot according to the first aspect, wherein the metal member of the large-diameter mounting portion is fixed to the outer peripheral surface of the outer ring, and the inner ring of the outer ring. And an inner part that forms a drop-off prevention part located on the circumferential side.

  According to the constant velocity joint boot of claim 4, the large-diameter attachment portion can be fixed to the outer ring at the outer side portion of the metal member, and the drop-off preventing portion can be reinforced at the inner side portion of the metal member. Therefore, it is possible to effectively prevent the drop prevention portion from being damaged and attach the large diameter attachment portion to the outer ring without using a separate attachment component such as a boot band. As a result, the durability of the constant velocity joint can be improved, and the assembly can be facilitated and the cost can be reduced by reducing the number of parts.

  A constant velocity joint boot according to a fifth aspect of the present invention is the constant velocity joint boot according to the fourth aspect, wherein the constant velocity joint boot is fitted to a concave portion formed on the outer peripheral surface of the outer ring on the outer side portion of the metal member of the large-diameter mounting portion. It is characterized in that a convex portion is provided.

  According to the constant velocity joint boot of claim 5, the convex portion provided on the outer side of the metal member of the large-diameter mounting portion is easily and reliably fitted into the concave portion formed on the outer peripheral surface of the outer ring. The large-diameter mounting portion can be fixed to the outer ring.

  The constant velocity joint boot according to claim 6 is the constant velocity joint boot according to claim 4, wherein the outer side portion of the metal member of the large-diameter mounting portion is fixed to the outer peripheral surface of the outer ring by plastic deformation. It is characterized by.

  According to the constant velocity joint boot of the sixth aspect, the large-diameter attaching portion can be firmly fixed to the outer ring by plastically deforming the outer portion of the metal member of the large-diameter attaching portion.

  The constant velocity joint boot according to the invention of claim 7 is the constant velocity joint boot according to claim 1, wherein the metal member of the large-diameter mounting portion is provided with a seal member on the surface in contact with the outer ring. .

  According to the constant velocity joint boot of claim 7, the large-diameter mounting portion can be fixed to the outer ring, and the space between the boot and the outer ring can be sealed by the seal member. Therefore, it is possible to effectively prevent the grease filled inside the outer ring from leaking between the boot and the outer ring.

  A constant velocity joint boot according to an eighth aspect of the present invention is the constant velocity joint boot according to the second aspect, characterized in that the flexible member is formed of a thermoplastic elastomer.

  According to the constant velocity joint boot of claim 8, the metal member can be easily and firmly fixed to the flexible member by integral molding.

  A constant velocity joint boot according to a ninth aspect of the invention is characterized in that, in the constant velocity joint boot according to the seventh aspect, the seal member is formed of a thermoplastic elastomer.

  According to the constant velocity joint boot of claim 9, the seal member can be easily and firmly fixed to the metal member by integral molding.

  A tenth aspect is a constant velocity joint including the constant velocity joint boot according to any one of the first to ninth aspects. Such a constant velocity joint can have a long life because the durability of the boot is high.

  According to the present invention, by providing the metal member in the drop-off preventing portion, it is possible to prevent damage due to the contact of the inner member, and it is possible to prevent the inner component from dropping off stably with high durability. Joint boots are obtained.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

(First embodiment)
Fig.1 (a) is sectional drawing which shows the constant velocity joint using the boot of 1st Embodiment of this invention, FIG.1 (b) is a side view which shows the metal member of the boot of 1st Embodiment. .

  The boot 1 of this embodiment is made of chloroprene rubber (CR), and has a small-diameter attachment portion 4 attached to the shaft member 2 at one end and a large-diameter attachment portion 6 attached to the outer ring 5 of the constant velocity joint at the other end. The bellows part 7 is provided between these attachment parts 4 and 6. The small diameter attaching portion 4 of the boot is fixed to the shaft member 2 by a boot band. The boot 1 is made of rubber material such as nitrile rubber (NBR), silicon rubber (VMQ, FVMQ), fluoro rubber (FKM, FFKM), or thermoplastic such as ester, olefin, urethane, amide, or styrene. You may form using an elastomer.

  On the inner side of the large-diameter attachment portion 6 of the boot 1, a bowl-shaped dropout prevention portion 8 that is fitted to the inner peripheral surface of the outer ring 5 is integrally formed. A plurality of guide grooves 9 extending in the axial direction and having an equal angle in the circumferential direction are formed on the inner peripheral surface of the outer ring 5. The number of guide grooves 9 is usually 6 or 8. The guide groove 9 accommodates the ball 10 together with the guide groove formed on the outer peripheral surface of the inner ring 3 and guides it in the axial direction, and extends from the bottom side of the inner peripheral surface of the outer ring 5 to the vicinity of the opening end. is doing. On the extension of the guide groove 9 at the opening end of the outer ring 5, a fall-off prevention portion 8 for the boot 1 is disposed. The guide groove 9 may be formed until the inner peripheral surface of the outer ring 5 reaches the opening end. In this case, the drop-off preventing portion 8 can be fitted to the opening end of the guide groove 9. A plurality of drop-off prevention portions 8 are provided in the circumferential direction of the inner peripheral surface of the large-diameter mounting portion 6 of the boot 1 in the same number as the guide grooves 9 at equal angles at positions corresponding to the guide grooves 9 of the outer ring 5. Yes.

  A ring-shaped metal member 11 is integrally formed on the large-diameter attachment portion 6 of the boot 1 at the position where the drop-off prevention portion 8 is disposed. The ring-shaped metal member 11 has a substantially U-shaped clip shape in the axial cross section of the constant velocity joint, and is fixed to the outer portion fixed to the main body of the large-diameter mounting portion 6 and the drop-off preventing portion 8. With an inner part. A convex portion 11 a that fits into a concave portion provided on the outer peripheral surface of the outer ring 5 is provided at the tip of the outer portion of the metal member 11. When the large-diameter attachment portion 6 of the boot is attached to the outer ring 5, the metal member 11 is fitted into the opening end of the outer ring 5, and the convex portion 11 a is fitted into the concave portion of the outer ring 5. The part 6 is fixed to the outer ring 5. A seal member 12 formed of a film of chloroprene rubber (CR) is integrally formed on the surface of the outer side of the metal member 11 on the side in contact with the outer ring 5 and in contact with the outer peripheral surface of the outer ring 5. The seal member 12 is made of rubber material such as nitrile rubber (NBR), silicon rubber (VMQ, FVMQ), fluoro rubber (FKM, FFKM), heat such as ester, olefin, urethane, amide, or styrene. You may form using a plastic elastomer.

  In the constant velocity joint of the present embodiment, when the boot 1 is assembled to the outer ring 5, the drop-off prevention part 8 is disposed on the extension line of the guide groove 9 of the outer ring 5. Therefore, when the inner part including the inner ring 3 and the ball 10 of the constant velocity joint slides and the ball 10 is pulled toward the opening end side of the outer ring 5, the ball 10 comes into contact with the end face of the drop-off preventing portion 8. Thereby, the movement of the ball 10 to the further opening end side is stopped, and the inconvenience that the ball 10 is detached from the opening of the outer ring 5 and the inner part is dropped from the outer ring 5 is prevented.

  Here, since the drop-off prevention part 8 is reinforced by the inner part of the integrally formed metal member 11, an impact that the ball 10 abuts and a force that pulls the inner member through the abutting ball 10 acts. Even so, it is possible to prevent the inconvenience that the drop-off prevention unit 8 is damaged. In addition, since the metal member 11 is fixed to the outer ring 5 by the convex portion 11 a, the large-diameter mounting portion 6 of the boot 1 is detached from the outer ring 5 even if an impact force or a pulling force acts on the drop-off preventing portion 8 from the ball 10. Inconvenience can be prevented.

  Further, since the convex portion 11a of the metal member 11 is fitted into the concave portion of the outer ring 5 and the large-diameter mounting portion 6 is fixed to the outer ring 5, the work of assembling the boot 1 to the outer ring 5 can be facilitated and strong. In addition, the large-diameter mounting portion 6 of the boot 1 can be fixed to the outer ring 5. Moreover, since the large diameter attaching part 6 is fixed to the outer ring 5 by the metal member 11, the boot band for fixing the large diameter attaching part 6 to the outer ring 5 can be eliminated, and the number of parts of the constant velocity joint can be reduced. Therefore, the assembly of the constant velocity joint can be facilitated and the cost can be reduced.

  Further, since the seal member 12 is integrally formed on the surface of the metal member 11 on the side in contact with the outer ring 5, the gap between the boot 1 and the outer ring 5 can be sealed, and the grease filled inside the outer ring 5 can be sealed. The inconvenience leaking from between the boot 1 and the outer ring 5 can be effectively prevented. Since the seal member 12 is formed at a position lower than the height of the convex portion 11 a, the seal member 12 may be damaged by rubbing against the outer peripheral surface of the outer ring 5 when fixing the large-diameter mounting portion 6 of the boot 1 to the outer ring 5. Absent. That is, the convex portion 11 a of the metal member 11 also has a protective function for the seal member 12. Further, the convex portion 11a also has a function of facilitating the insertion of the metal member 11 into the outer ring 5 due to its arc shape.

(Second Embodiment)
FIG. 2A is a cross-sectional view showing a constant velocity joint using a boot according to a second embodiment of the present invention, and FIG. 2B is a side view showing a metal member of the boot according to the second embodiment. .

  The boot of the second embodiment is different from the boot of the first embodiment in that the shape of the metal member and the attachment structure of the large-diameter attachment portion are different. In the second embodiment, only parts different from the first embodiment will be described, and the same reference numerals are used for the same components as those in the first embodiment, and detailed description thereof will be omitted.

  As shown in FIG. 2 (b), the metal member 13 provided in the large-diameter attachment portion 6 of the boot 1 has a substantially U-shaped clip shape in the axial cross section of the constant velocity joint. It has a shape such that the convex portion 11a of the metal member 11 is deleted. On the inner surface of the outer portion of the metal member 11, a seal member 14 formed of a chloroprene rubber film is integrally formed. The large-diameter attachment portion 6 provided with the metal member 13 is attached in a state in which the metal member 13 is fitted to the opening end of the outer ring 5, and then the outer portion of the metal member 13 is plasticized to the inner diameter side by caulking. It is deformed and fixed to the outer ring 5. Since the inner diameter of the seal member 14 before caulking is larger than the outer diameter of the outer ring 5, the seal member 14 rubs against the outer peripheral surface of the outer ring 5 when the metal member 13 is fitted to the opening end of the outer ring 5. There is no damage.

  According to the boot 1 of the present embodiment, the large-diameter mounting portion 6 of the boot 1 can be firmly fixed to the outer ring 5 by plastic deformation of the metal member 13, so that the ball 10 is moved to the drop-off preventing portion 8 by sliding the inner part. Even if a force that pulls out the inner member through the ball 10 that has collided and acts on the drop-off preventing portion 8, it is possible to effectively prevent the inconvenience that the large-diameter mounting portion 6 of the boot 1 is detached from the outer ring 5. . Further, since the seal 14 can be firmly adhered to the outer peripheral surface of the outer ring 5 due to plastic deformation of the metal member 13, leakage of grease from between the boot 1 and the outer ring 5 can be effectively prevented.

(Third embodiment)
FIG. 3 is a cross-sectional view showing a constant velocity joint using a boot according to a third embodiment of the present invention.

  The boot of the third embodiment is different from the boot of the first embodiment in that the shape of the metal member and the attachment structure of the large-diameter attachment portion are different. In the third embodiment, only parts different from the first embodiment will be described, and the same reference numerals are used for the same components as those in the first embodiment, and detailed description thereof will be omitted.

  In the boot 1 of the third embodiment, a metal member 15 similar to the boot 1 of the second embodiment is provided on the large-diameter attachment portion 6 of the boot 1. That is, the metal member 15 has a substantially U-shaped clip shape in the axial cross section of the constant velocity joint. At the opening end portion of the outer ring 5 to which the large-diameter attachment portion 6 provided with the metal member 15 is attached, a hook-like protrusion 5a protruding outward in the radial direction is formed at the tip corresponding to the attachment position of the metal member 15. Has been. In the assembly work of the boot 1 to the outer ring 5, first, the large-diameter attachment portion 6 is attached to the opening end portion of the outer ring 5. At this time, the metal member 15 is inserted into the opening end portion of the outer ring 5 so as to enclose the hook-shaped protrusion 5 a at the opening end of the outer ring 5. Thereafter, a caulking force is applied to the outer peripheral surface of the large-diameter mounting portion 6, and the outer portion of the metal member 15 is plastically deformed into a shape along the surface and outer peripheral surface of the hook-shaped protrusion 5 a of the outer ring 5. Thus, as shown in FIG. 3, the metal member 15 is shaped along the inner peripheral surface of the opening end of the outer ring 5, the surface of the hook-shaped protrusion 5 a, and the outer peripheral surface, and the large-diameter mounting portion 6 is formed on the outer ring 5. Fixed to the open end. In order to facilitate the insertion of the metal member 13 when the large-diameter attachment portion 6 is attached to the opening end of the outer ring 5, a tapered surface may be formed on the inner diameter surface of the tip of the metal member 15. The maximum diameter of the tapered surface is set slightly larger than the outer diameter of the hook-shaped protrusion 5a.

  According to the boot 1 of the present embodiment, the metal member 15 is shaped along the inner peripheral surface of the opening end of the outer ring 5, the surface of the hook-shaped protrusion 5a, and the outer peripheral surface. Since the metal member 15 engages with the hook-shaped protrusion 5a even if the force 10 pulls out the inner member via the contacted ball 10 and the force that pulls out the inner member acts on the drop-off prevention portion 8. The metal member 15 is not detached from the outer ring 5. Therefore, the inconvenience that the large-diameter attaching portion 6 of the boot 1 is detached from the outer ring 5 can be effectively prevented.

  In each of the above embodiments, the metal member 11 that is not caulked out of the metal members 11, 13, and 15 has a clip shape with a substantially U-shaped cross section in addition to the ring shape, and has a large diameter attachment portion 6 It is also possible to provide a plurality of dropout prevention portions 8 at the arrangement positions. The number at this time is the same as the number of the dropout prevention parts 8, or, for example, one metal member 11 shared by the two dropout prevention parts 8 may be used. In addition, a plate-like metal member may be provided on the large-diameter attachment portion 6 so as to extend along at least the drop-off prevention portion 8.

Fig.1 (a) is sectional drawing which shows the constant velocity joint using the boot of 1st Embodiment, FIG.1 (b) is a side view which shows the metal member of the boot of 1st Embodiment. FIG. 2A is a cross-sectional view showing a constant velocity joint using the boot of the second embodiment, and FIG. 2B is a side view showing a metal member of the boot of the second embodiment. It is sectional drawing which shows the constant velocity joint using the boot of 3rd Embodiment. It is sectional drawing which shows the constant velocity joint in which the conventional drop-off prevention was given.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Boot 2 Shaft member 3 Small diameter attachment part 5 Outer ring 6 Large diameter attachment part 7 Bellows part 8 Fall-off prevention part 9 Guide groove 10 Ball 11, 13, 15 Metal member 11a Convex part

Claims (10)

A small-diameter attachment portion that is attached to the shaft member of the constant velocity joint, a large-diameter attachment portion that is attached to the outer ring of the constant-velocity joint, and a flexible member that is positioned between the small-diameter attachment portion and the large-diameter attachment portion. A flexible portion that can follow the operating angle of the constant velocity joint, and a drop-off prevention portion that is provided on the large-diameter mounting portion and is disposed on the inner peripheral side of the outer ring to prevent the inner part from falling off the outer ring. In constant velocity joint boots,
A boot for a constant velocity joint, wherein a metal member located at least in a drop-off preventing portion is provided on a large-diameter attachment portion. The constant velocity joint boot according to claim 1,
A boot for a constant velocity joint in which a metal member of a large-diameter attachment portion is integrally formed with a flexible member connected to a flexible portion. The constant velocity joint boot according to claim 1,
A boot for a constant velocity joint, wherein the metal member of the large-diameter mounting portion has a substantially U-shaped cross section that can be fitted to the opening end of the outer ring. The constant velocity joint boot according to claim 1,
A boot for a constant velocity joint, wherein the metal member of the large-diameter mounting portion has an outer portion fixed to the outer peripheral surface of the outer ring and an inner portion that is located on the inner peripheral side of the outer ring and forms a drop-off preventing portion. The constant velocity joint boot according to claim 4,
A boot for a constant velocity joint in which a convex portion that fits into a concave portion formed on an outer peripheral surface of an outer ring is provided on an outer side portion of a metal member of a large-diameter attachment portion. The constant velocity joint boot according to claim 4,
A boot for a constant velocity joint in which an outer portion of a metal member of a large-diameter mounting portion is fixed to an outer peripheral surface of an outer ring by plastic deformation. The constant velocity joint boot according to claim 1,
A constant velocity joint boot in which a metal member of a large-diameter mounting portion is provided with a seal member on a surface on a side in contact with an outer ring. The constant velocity joint boot according to claim 2,
A constant velocity joint boot, wherein the flexible member is formed of a thermoplastic elastomer. The constant velocity joint boot according to claim 7,
A boot for a constant velocity joint in which a seal member is formed of a thermoplastic elastomer.   The constant velocity joint provided with the boot for constant velocity joints as described in any one of Claim 1 to 9.

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