JP2007078105A - Boot for constant velocity universal joint with dynamic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a working efficiency for tightening fastening bands by reducing the number of the fastening bands fastened to a drive shaft. <P>SOLUTION: A dynamic damper part is integrally fitted to the rotating shaft side boot small diameter end of a boot body formed to cover the inside of a constant velocity universal joint starting at the outer ring of the constant velocity universal joint or a boot fixing member fitted to the outer ring toward a rotating shaft connected to the constant velocity universal joint. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a constant velocity universal joint boot and a dynamic damper used for automobiles and the like.

  Generally, a constant velocity universal joint is provided with a boot so as to cover the inside of the joint in order to prevent leakage of grease enclosed in the joint and to prevent foreign matter from entering the joint (see Patent Document 1, etc.). .

  In general, a rotating body such as a drive shaft of an automobile has a vibration amplification phenomenon due to resonance vibration. In order to ensure the riding comfort and quietness required for automobiles, it is necessary to prevent this resonance vibration. As a method for preventing this resonance vibration, there is a method of adjusting the natural frequency by providing a dynamic damper on the drive shaft (see Patent Document 2).

  In order to more reliably prevent leakage of grease and intrusion of foreign matter, the boot is tightened with an annular band (fastening band). Further, in order to fix the dynamic damper to the drive shaft, both ends of the dynamic damper are tightened with an annular band (fastening band).

  Specifically, the constant velocity universal joints 1a and 1b are attached to the drive shaft 2 as shown in FIG. Next, the boots 4a and 4b are attached so as to cover the inside of the constant velocity universal joints 1a and 1b from the outer rings 3a and 3b of the constant velocity universal joints 1a and 1b to the drive shaft 2.

  The fastening bands 5a are connected to the large diameter ends of the boots 4a and 4b connected to the outer rings 3a and 3b of the constant velocity universal joints 1a and 1b and the small diameter ends of the boots 4a and 4b connected to the drive shaft 2, respectively. , 5b, 5c, 5d are provided, whereby the boots 4a, 4b can be fastened to the outer rings 3a, 3b and the drive shaft 2 of the constant velocity universal joints 1a, 1b.

  Further, as shown in FIG. 3, the dynamic damper 6 is inserted into the drive shaft 2, and the dynamic damper 6 can be fastened to the drive shaft 2 by fastening both ends thereof with fastening bands 7a and 7b.

JP 2002-357118 A Japanese Patent Laid-Open No. 06-094075

  By the way, when attaching the boots 4a, 4b and the dynamic damper 6 to the drive shaft 2, it is necessary to fasten the four fastening bands 5c, 5d, 7a, 7b.

  Accordingly, an object of the present invention is to increase the working efficiency of fastening band fastening by reducing the number of fastening bands fastened to the drive shaft.

  The present invention solves the above-mentioned problems by providing a dynamic damper portion integrally with the boot small-diameter end on the rotating shaft side of the boot covering the constant velocity universal joint.

  Since the constant velocity universal joint boot and the dynamic damper are integrally provided, the number of the fastening bands to be fastened to the drive shaft can be reduced. Thereby, it becomes possible to improve the work efficiency of fastening band fastening.

  Boots for constant velocity universal joints with dynamic dampers according to the present invention (hereinafter simply referred to as “boots according to the present invention”) 11a and 11b are as shown in FIGS. 1 (a) and 1 (b). This is a boot in which a dynamic damper portion 14 is provided integrally with a small diameter end portion 13 of a joint boot main body 12.

  In the present specification, the “small diameter end portion of the boot body” means the end portion of the boot body having the smaller diameter on the side attached to the rotating shaft, and the “boot body” described later. The “large-diameter end portion” means an end portion having a larger diameter on the side attached to the outer ring of the constant velocity universal joint or the boot fixing member attached to the outer ring, of the both ends of the boot body.

  The constant velocity universal joint is a joint that has been used in the past, and is not particularly limited. Examples thereof include constant velocity universal joints 15a and 15b shown in FIGS. 2 (a) and 2 (b). it can. The boot body 12 is provided so as to cover the constant velocity universal joint from the constant velocity universal joint to the rotating shaft 10 connected to the constant velocity universal joint.

  As the material constituting the boot main body 12, it is preferable to use a material made of a flexible resin such as rubber because it is necessary to match the movement of the rotating shaft 10.

  As shown in FIGS. 1A and 1B, the dynamic damper portion 14 is provided with an attachment cylinder portion 21 for attachment to the rotation shaft 10, and the rotation shaft 10 provided on the outer peripheral surface side of the attachment cylinder portion 21. A cylindrical weight member 22 having the same axial center as the above, and a holding member 23 for holding the weight member 22 in the mounting cylinder portion 21. And the boot concerning this invention is comprised by connecting and integrating the said boot small diameter edge part 13 and one edge part of the attachment cylinder part 21 of the dynamic damper part 14. FIG.

  The mounting cylinder portion 21 is a cylindrical member that is in close contact with the rotary shaft 10 and stably attaches the weight member 22 around the rotary shaft 10. The material is made of a flexible resin such as rubber. Material is preferred.

  The weight member 22 is a cylindrical member that adjusts the natural frequency of the rotary shaft 10 so that the rotary shaft 10 is not amplified from the outside. The mass is adjusted by the number and the vibration that the rotating shaft 10 receives from the outside. Further, the material constituting the weight member 22 is not particularly limited as long as it has a mass necessary for adjusting the natural frequency and has a volume attachable to the rotary shaft 10. Examples of such a material include metals.

  The holding member 23 is a member for holding the weight member 22 on the mounting cylinder portion 21, and the holding method is not particularly limited. For example, as shown in FIGS. 1A and 1B, the weight member 22 is covered by the mounting tube portion 21 and the holding member 23, and the mounting tube portion 21 and the holding member 23 are integrally connected. A method of fixing the weight member 22 to the mounting tube portion 21 is given. Although not shown, there is a method of holding the weight member by the holding member alone and fixing the holding member to the mounting member.

  The boot body 12 and the mounting cylinder part 21 may be molded separately, and then the small diameter end part 13 of the boot body 12 and the mounting cylinder part 21 of the dynamic damper part 14 may be joined. It is more preferable to integrally mold the material because the manufacturing process can be simplified. In particular, it is more preferable that the boot main body 12 and the mounting cylinder portion 21 and, if necessary, the members of the holding member 23 are made of the same material, it is easy to form integrally.

  Next, a method for fixing the boots 11a and 11b according to the present invention to the constant velocity universal joints 15a and 15b and the rotary shaft 10 will be described.

  As a method for fixing the boot main body 12 to the constant velocity universal joints 15a and 15b of the boot 11a and 11b according to the present invention, as shown in FIG. There is a method of fixing by fixing the fastening band 19 by attaching to the outer ring 16a of the universal joint 15a. As another fixing method, as shown in FIG. 2B, the edge of the large-diameter end 18b of the boot body 12 is fitted into the boot fixing member 17 attached to the outer ring 16b of the constant velocity universal joint 15b. The method of fixing can be raised.

  On the other hand, as a method of fixing the boots 11a and 11b to the rotating shaft 10 according to the present invention, as shown in FIG. 1 (a), a fastening band 24a is formed on the outer end portion of the mounting cylinder portion 21 of the dynamic damper portion 14. And a fastening band 24b at the connecting portion between the small-diameter end portion 13 of the boot and the mounting cylinder portion 21 of the dynamic damper portion 14 as shown in FIG. 1 (b). And a method of fixing by tightening this.

  When the boot body, the mounting cylinder portion, and the holding member of the boot for the constant velocity universal joint with a dynamic damper according to the present invention are manufactured from the same material using a thermoplastic resin such as rubber, the manufacturing method includes injection molding, etc. It can manufacture using the method of.

Sectional drawing which shows the example of the boot for constant velocity universal joints with a dynamic damper concerning this invention Sectional drawing which shows the other example of the boots for constant velocity universal joints with a dynamic damper concerning this invention Sectional drawing showing an example of attaching a boot for a constant velocity universal joint with a dynamic damper to the constant velocity universal joint Sectional drawing which shows the other example which attaches the boot for constant velocity universal joints with a dynamic damper to a constant velocity universal joint Partial sectional view showing an example of a conventional dynamic damper and a boot for a constant velocity universal joint

Explanation of symbols

1a, 1b constant velocity universal joint 2 drive shafts 3a, 3b outer rings 4a, 4b boots 5a, 5b, 5c, 5d fastening bands 6 dynamic dampers 7a, 7b fastening bands

DESCRIPTION OF SYMBOLS 10 Rotating shaft 11a, 11b Constant velocity universal joint boot 12 with a dynamic damper Boot body 13 Small diameter end part 14 Dynamic damper part 15a, 15b Constant velocity universal joint 16a, 16b Outer ring 17 Boot fixing member 18a, 18b Large diameter end part 19 Fastening band

21 Attachment cylinder part 22 Weight member 23 Holding member 24a, 24b Fastening band

Claims (4)

  The rotating shaft of the boot body provided so as to cover the inside of the constant velocity universal joint from the outer ring of the constant velocity universal joint or the boot fixing member attached to the outer ring to the rotational shaft connected to the constant velocity universal joint A boot for a constant velocity universal joint with a dynamic damper, in which a dynamic damper portion is integrated with the small diameter end portion of the boot on the side. The dynamic damper portion includes an attachment tube portion for attachment to the rotation shaft, a cylindrical weight member provided on the outer peripheral surface side of the attachment tube portion and having the same axis as the rotation shaft, and the weight member. It is composed of a holding member that holds the mounting cylinder part,
The boot for a constant velocity universal joint with a dynamic damper according to claim 1, wherein the small-diameter end portion of the boot is connected to one end portion of the mounting cylinder portion of the dynamic damper portion.   The boot for a constant velocity universal joint with a dynamic damper according to claim 1 or 2, wherein the boot main body and the mounting cylinder portion of the dynamic damper portion are integrally formed.   The fastening band is provided in any one of the connection part of the said boot small diameter end part and the attachment cylinder part of the said dynamic damper part, or the outer end part of the attachment cylinder part of the said dynamic damper part. Boots for constant velocity universal joints with the described dynamic damper.

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