JPH0613419Y2 - Universal joint boots - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a universal joint, in particular, a boot that covers a universal joint that connects a vehicle drive shaft and wheels and is used for grease retention and dust protection. is there.

(Prior art and its problems) This kind of boot is made of a polymer elastic material, for example, an elastic material such as CR (chloroprongum), and is formed into a bellows-like conical shape.
The large diameter end and the small diameter end are clamped on the shaft joint and the drive shaft, respectively, and the universal joint is surrounded. Therefore, if the boot is damaged during use and needs to be replaced, remove the drive shaft from the universal joint, remove the boot, insert the drive shaft into the new boot, connect the drive shaft to the universal joint, and finally The boots had to be clamped and it took a lot of time to replace only the boots. Further, even if the boots are not replaced, it is very inconvenient because the boots have to be put through the drive shaft in advance even at the time of initial assembly.

In order to eliminate this drawback, a boot was proposed in which the boot body can be cut in the axial direction to be opened and an adhesive is applied to the cut surface to join the boot body, but this boot is easy to assemble. However, there is a drawback that the cut surface of the boot body is not reliable.

The present applicant has previously proposed boots in which a fastener is provided on the cut surface in the axial direction of the boot body (Japanese Patent Laid-Open No. 62-13823) and boots using an adhesive tape (Japanese Patent Laid-Open No. 62-13823), and the effects are shown. However, we have continued our efforts to obtain even cheaper and more reliable boots. That is, efforts have been made to obtain a boot that does not break from the cut surface of the boot body and that can further reinforce the boot body without the cut surface.

(Means for Solving the Problems) The universal joint boot of the present invention is made of a polymer elastic material to cover the universal joint, and is a bellows-shaped and conical flexible boot. , Providing a row of concentric or spiral ridges in the circumferential direction, making a single cut in the longitudinal direction on the side surface of the boot body, and after inserting the part of the universal joint to be covered by the boot from this cut, A band having a groove that fits into the ridge is fitted along the ridge so that the band is wound around the boot body to reinforce the boot body.

(Operation) Since the outer periphery of the boot body is reinforced with the band, the strength of the boot body itself is enhanced, and the boot body is not damaged by the cut surface of the boot body, so that the reliability of the boot can be enhanced.

(Example) FIG. 1 shows a typical boot body 3 used for the universal joint 1 and the drive shaft 2.

FIG. 2 shows the boot body 3 cut in the axial direction,
FIG. 3 is a side view seen in the direction of arrow A in FIG. In the example of FIG. 2, the boot body 3 is cut in the axial direction, but the cut surface is cut obliquely as is clear from FIG. However, it may be cut at a right angle to the circumferential direction. In either case, the cut parts of the boot body are overlapped and joined.

An adhesive tape 5 is attached to one of the cut surfaces 4 of the diagonally cut cuts. This adhesive tape 5 can be adhered to the other cut surface by making the cut surface 4 of the boot body 3 sticky by peeling off the adhesive tape 5. To mount the boot body 3 on the universal joint 1 and the drive shaft 2, after disposing the boot body 3 around the already assembled universal joint 1 and drive shaft 2, the adhesive tape 5 is peeled off and the other side is cut on the cut surface 4. Adhesive by pressing the cut surface. A clamp device is used for adhesion and the joint is held for a predetermined time.

In the present invention, in order to enhance the reliability of the strength of the boot body 3 as shown in FIG. 4, a band 6 in the circumferential direction is provided to reinforce the peaks and valleys of the bellows-shaped boot body for reinforcement.

The details of the relationship between the band 6 and the boot body are shown in FIG.
In this embodiment, the band 6 is provided with an elliptical groove 8, while the ridges and valleys of the boot body are circumferentially provided with protrusions 10 which fit into the groove 8 so that the groove 8 and the protrusion 10 are fitted together. Then, the band 6 is fixed. An adhesive such as an epoxy resin may be used in combination with this fitting portion.

Although the boot body shown in FIGS. 1, 2 and 4 has a concentric bellows structure, it may be a boot body in which the bellows are spirally connected. In that case, the band 6 can be made into one continuous body.

As the material of the band, rubber, resin such as soft vinyl chloride, or a composite material of rubber and resin is used. When the band strength is further required, rubber or resin reinforced with glass fiber, carbon fiber or the like is used.

(Effect) In the present invention, the band that can be easily attached is attached around the boot body to reinforce the boot body against expansion, so that the reliability of the boot body can be significantly improved. Since the band of the present invention can be easily attached and the circumferential groove and the ridge are fitted to each other, the band does not come off and the reliability can be further enhanced.

[Brief description of drawings]

FIG. 1 is a front view of a typical boot body used for a universal joint and a drive shaft of a vehicle, FIG. 2 is a front view of a boot body cut in an axial direction, and FIG. 3 is an arrow A in FIG. 4 is a front view of the boot body of the present invention provided with a band, and FIG. 5 is a partially enlarged view showing the fitting between the band and the boot body of the boot body of the present invention. 1 ... Universal joint, 2 ... Drive shaft 3 ... Boot body, 4 ... Cut surface 5 ... Adhesive tape, 6 ... Band 8 ... Groove, 10 ... Projection

Claims (3)

[Scope of utility model registration request] 1. A bellows-shaped and cone-shaped flexible boot formed of a polymer elastic material for covering a universal joint, which is concentric or spiral in the circumferential direction on the outer periphery of the boot body (3). A row of ridges (10) is provided, and a single cut (4) is inserted in the side surface of the boot body (3) in the substantially longitudinal direction, and after inserting the part of the universal joint to be covered by the boot from this cut, A band (6) having a groove (8) that fits into the ridge (10) is fitted into the groove (8) along the ridge (10) so that the band (6) is attached to the boot body. A universal joint boot characterized in that it is wound around (3) to reinforce it. 2. A utility model registration claim in which the band (6) is fixed to the boot body (3) by adhering the groove (8) and the ridge (10) with an adhesive. A boot for universal joint according to the item. 3. The utility model registration claim 1 in which the boot body (3) is configured as a boot body composed of a bellows that is spirally connected, and the band (6) is configured as an integral continuous band. Boots for universal joints.