JP2007078032A - Constant-velocity joint boot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of parts and the number of man-hours when a constant-velocity joint boot is fitted to a constant-velocity joint for assembling. <P>SOLUTION: A spring member 15 as a spring member, extending annularly or in C-shape along the outer peripheral surface of a rotating shaft 21 and tightening a boot small diameter end part 12 on the rotating shaft 21, is incorporated in the tubular boot small diameter end part 12 of the constant-velocity joint boot 11 which was secured to the rotating shaft 21 of the constant-velocity joint with a boot band. The boot small diameter end part 12 is expanded, together with the spring member 15 and the rotating shaft 21 is passed therethrough, and the boot small diameter end part 12 is secured to the rotating shaft 21 by the elastic force of the spring member 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a constant velocity joint boot that covers a constant velocity joint.

  For example, a constant velocity joint boot 1 as shown in FIG. 5 is coated on a constant velocity joint provided in a high speed rotating portion such as a propeller shaft (Patent Document 1). The constant velocity joint boot 1 includes a boot small-diameter end 2, a boot large-diameter end 3 that extends from the boot small-diameter end 2, extends and inverts, and further extends, and the boot small-diameter end 2 and the boot large-diameter end 3. The constant velocity joint is covered with a member formed between the valley portions 4 between the two and connecting them. In this constant velocity joint boot 1, a boot small diameter end 2 is fixed to a boot small diameter end fixing groove 7 provided on a rotating shaft 6 by a boot band 5, and a boot large diameter end 3 is fixed to an outer ring side fixing plate 8. Fixed.

  Further, on the back side of the trough portion 4, between the rotating shaft 6 and the fixed plate 8 is filled with grease 9 to ensure the function of the constant velocity joint, and the constant velocity joint boot 1 has a small diameter end of the boot. By tightening the portion 2 in the boot small-diameter end fixing groove 7, the grease 9 is enclosed to prevent the outflow.

JP-A-7-224857

  However, since the conventional constant velocity joint boot is fixed to the rotating shaft 6 by the boot band 5, the number of parts used for assembling the constant velocity joint is increased, and the number of parts management man-hours and assembly are increased. The man-hour was increasing.

  Accordingly, an object of the present invention is to manufacture a constant velocity joint boot that does not require a boot band, and to reduce the number of parts, the part management man-hour, and the assembly man-hour required for assembling the constant velocity joint.

  The present invention provides a spring material for fastening the boot small diameter end portion to the rotating shaft inside the cylindrical boot small diameter end portion which becomes the rotating shaft side when the constant velocity joint boot is attached to the constant velocity joint. The above problem has been solved by manufacturing a constant velocity joint boot provided in an annular shape or a C shape along the outer peripheral surface of the rotating shaft.

  That is, the spring material is expanded to loosen the boot small-diameter end, and after passing the rotating shaft through the boot small-diameter end, the boot small-diameter end is tightened to the rotating shaft by the elasticity of the spring material. be able to.

  Since the constant velocity joint boot according to the present invention can be fixed to the rotating shaft by the spring material incorporated in the small diameter end portion of the boot, it is not necessary to fit and fix the boot band separately when attaching to the constant velocity joint. It is possible to reduce the number of parts, part management man-hours, and assembly man-hours.

  The present invention will be described in detail below with reference to FIGS. 1 and 2 show sectional views of an example in which the constant velocity joint boot 11 according to the present invention is attached to the rotary shaft 21 of the constant velocity joint. The constant velocity joint boot 11 covers the inside of the constant velocity joint from the outer ring 32 of the constant velocity joint or the boot fixing member 31 attached to the outer ring 32 to the rotating shaft 21 connected to the constant velocity joint. is there. The rotating shaft 21 side of the constant velocity joint boot becomes a cylindrical boot small diameter end portion 12 and is attached to the rotating shaft 21, and the boot fixing member 31 or the outer ring 32 side is wider than the boot small diameter end portion 12. The large-diameter boot 13 having a cylindrical shape is attached to the boot fixing member 31 or the outer ring 32.

  For example, as shown in FIG. 1, the boot small-diameter end portion 12 and the boot large-diameter end portion 13 extend from the small-diameter boot portion 12 in a cylindrical shape, and are inverted to form a valley portion 14 so as to further expand. There may be a portion having the large-diameter boot end portion 13 at the place, or a portion having a small bellows between the small-diameter boot end portion 12 'and the large boot end portion 13' as shown in FIG.

  Thus, grease 41 for ensuring the function of the constant velocity joint is sealed inside the constant velocity joint boot 11, and the boot small diameter end portion 12 and the boot large diameter end portion 13 are connected to the rotary shaft 21. The grease 41 is prevented from flowing out by being fixed to the fixing plate 31 or the outer ring 32. As the grease 41, oil or grease generally used as a lubricant such as molybdenum disulfide can be used.

  As a material of the constant velocity joint boot 11, a rubber elastic body such as a thermoplastic elastomer generally used for a constant velocity joint boot can be used.

  It is preferable that the boot small-diameter end portion 12 projects to the inner diameter side with respect to the boundary portion between the constant velocity joint boot 11 main body and the boot small-diameter end portion 12. The protruding portion fits into the boot small-diameter end fixing groove 22 carved in an annular shape on the rotating shaft 21, so that the constant velocity joint boot 11 is not easily detached from the rotating shaft 21.

  A spring material 15 is incorporated in the boot small-diameter end portion 12 so as to have a cross-sectional view as shown in FIG. Specifically, the spring material 15 has a shape extending in an annular shape or a C shape along the outer peripheral surface of the rotating shaft 21 to which the inside of the boot small diameter end portion 12 is attached. It works as a spring material that fastens to the rotating shaft 21. Further, the boot small-diameter end portion 12 needs to have such elasticity that it can be spread together with the spring material 15 and can pass through the rotating shaft 21.

  The spring material 15 may be in an annular shape in which both ends 15a are in contact with each other in a state where no force is applied from the outside, or a C-shaped part in which an annular part is cut away from each other. However, the C-shape is preferable because it is easier to handle. However, even when both ends 15a are separated from each other, the interval needs to be an interval at which the rotating shaft 21 can be fastened and fixed.

  Further, like the constant velocity joint boot 11 ′ shown in FIG. 2, a spring material 15 ′ is also incorporated in the large-diameter end portion 13 ′ connected to the outer ring 32 or the boot fixing member 31 attached to the outer ring 32. The boot large-diameter end portion 13 ′ may be fixed to the outer ring 32 by the elasticity of the spring material 15 ′.

  The number of the spring members 15 need not be only one, and two spring members 15 may be incorporated side by side in the rotation axis direction as shown in FIG. 3, or three or more may be incorporated side by side. By increasing the number of built-ins, the force for fixing to the boot small-diameter end fixing groove 22 becomes strong, and it becomes difficult to come off. However, if the number is increased, labor for manufacturing the constant velocity joint boot 11 is increased, and as the fixing effect by the spring material 15, two spring materials 15 are sufficient. It is more preferable that However, it is most preferable that the number is one at the time of manufacture and attachment.

  Further, the constant velocity joint boot 11 according to the present invention is provided with a projecting portion 16 on the inner diameter surface side of the portion in which the spring material 15 is incorporated in the inner diameter surface of the boot small diameter end portion 12 as shown in FIG. Also good. As shown in FIG. 4, the constant velocity joint boot 11 having such an overhanging portion 16 is provided with a fixing groove 23 on a portion of the groove bottom peripheral surface of the boot small-diameter end fixing groove 22 to which the overhanging portion 16 is attached. When attached to the rotating shaft 21, the constant velocity joint boot 11 can be more firmly fixed to the rotating shaft 21, the grease 41 can be securely sealed, and the constant velocity joint boot 11 can be fixed. The overhanging portion 16 and the fixing groove 23 must be at least capable of attaching the overhanging portion 16 to the fixing groove 23, and both are preferably formed into a rotating body formed in an annular shape.

  When the constant velocity joint boot according to the present invention is used, the constant velocity joint can be covered and fixed with the constant velocity joint boot without using a boot band which has been conventionally required separately. Thereby, the number of parts required for the assembly of the constant velocity joint can be reduced, and the assembly process can also be reduced.

(A) Sectional drawing which shows the example of the constant velocity joint boot concerning this invention, (b) AA sectional drawing of (a). Sectional drawing which shows the example of another constant velocity joint boot concerning this invention Enlarged cross-sectional view showing an example of a small-diameter end fixing groove portion Enlarged cross-sectional view showing an example of a small-diameter end fixing groove portion Sectional view showing an example of a conventional constant velocity joint boot

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Constant velocity joint boot 2 Boot small diameter end part 3 Boot large diameter end part 4 Valley part 5 Boot band 6 Rotating shaft 7 Boot small diameter end part fixing groove 8 Fixing plate 9 Grease 11, 11 'Constant velocity joint boots 12, 12' Boot Small-diameter end portion 13, 13 'Boot large-diameter end portion 14 Valley portion 15, 15' Spring material 15a Both ends 16 Overhang portion 21 Rotating shaft 22 Boot small-diameter end fixing groove 23 Fixing groove 31 Boot fixing member 32 Outer ring 33 Cage 34 Steel Sphere 35 Inner ring 41 Grease

Claims (2)

A cylinder on the rotating shaft side of the boot provided to cover the inside of the constant velocity joint from the outer ring of the constant velocity joint or the boot fixing member attached to the outer ring to the rotating shaft connected to the constant velocity joint. Inside the small diameter end of the boot,
A constant velocity joint boot in which a spring material for fastening the small-diameter end of the boot to the rotating shaft is incorporated in a C shape that is an annular shape or a part of the annular shape cut along the outer peripheral surface of the rotating shaft. A constant velocity joint with a boot in which the constant velocity joint boot according to claim 1 is attached to the constant velocity joint,
With a boot with a protruding groove provided on the inner diameter surface side of the portion containing the spring material in the inner diameter surface of the small diameter end portion of the boot, and a fixing groove provided on the outer peripheral surface of the rotating shaft to which the protruding portion is attached Constant velocity joint.

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