JPH04114132U - Constant velocity joint boots - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain reliable sealing performance in the part of a constant velocity joint boot that is tightened by a fastening band. [Structure] Slits 16 and 19 are provided at both ends 11 and 12 of the boot 1 to be tightened by the fastening band 8 so as to be cut from the open end surface without penetrating in the axial direction and to extend continuously or intermittently in the circumferential direction. Thereby, even if the tightening force of the fastening band 8 becomes non-uniform in the circumferential direction and wrinkles occur in the boot, only the outer portions of the slit portions 16 and 19 will be wrinkled, and the inner portions will not be wrinkled. Therefore, no gap is formed between the inner circumferential surface of the boot 1 and the outer circumferential surface of the member to be fastened, and the two are in close contact with each other to provide a reliable seal.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a boot for a constant velocity joint.

0002

[Conventional technology]

Conventionally, the driving force transmission shaft of automobiles and the like has been equipped with a constant velocity job as shown in Fig. 6, for example. Into is used. This constant velocity joint is connected to a drive shaft (not shown). It has a cylindrical shape with one end open and has a plurality of first guide grooves 41 extending in the axial direction on its inner circumference. The outer joint member 4 is connected to the driven shaft 50 and coaxially inside the outer joint member 4. A plurality of second guide grooves 5 are arranged on the outer periphery of the second guide grooves 5 and are formed in correspondence with the first guide grooves 41. 2 and between the first and second guide grooves 41 and 52. It consists of arranged balls 6 and a cage 7 that holds each ball.

0003 This constant velocity joint mainly has a grille sealed inside the joint. A boot 1a is attached to seal the lubricating oil (not shown) such as a base. child The boot 1a is usually formed into a bellows-shaped cylinder made of an elastic material such as rubber. , whose both ends 11a and 12a are the opening outer periphery of the outer joint member 4 and the outer periphery of the driven shaft 50. and is fastened by the fastening band 8. Fastening band used here 8, there is one that utilizes the lever principle as shown in FIG. 7, for example. This tightening When using the tie band 8, a ring-shaped band body 80 with both ends overlapped is used. is attached to the outer peripheral surface of the end of the boot 1a, and the one end 82 is joined to the band body 80. Push down the other end 84 of the band portion 83 to attach the other end 84 to the band body 80. Fastening is performed by fixing to the band body 80 with the caulking portion 85.

0004

[Problem that the idea aims to solve]

The boot 1a attached to the constant velocity joint as described above has both ends 11a, 12a is tightened with the fastening band 8, the inner periphery of both ends 11a, 12a The surface is in close contact with the outer peripheral surface of the opening of the outer joint member 4 and the outer peripheral surface of the driven shaft 50, and the joint This prevents the lubricating oil sealed inside from leaking.

[0005] However, when tightening the fastening band 8, it is necessary to wrap the fastening band in a ring shape. In order to reduce the diameter by pulling both ends of 8 in the circumferential direction. In addition, since a step may be formed in the overlapping portion of the fastening bands 8, the fastening band 8 may It is generally difficult to make the tightening force of the band 8 uniform in the circumferential direction. For example above In the case of the fastening band 8, it is not pulled so that the diameter of the band body 80 becomes small. Coupled with the formation of a step in the area where the boot 1a is drawn, the boot 1a is also partially drawn. I end up. For this reason, wrinkles sometimes occur in the boot 1a as shown in Figure 8. A gap A is formed between the fitting 1a and the part to be fastened (the outer periphery of the opening of the outer joint member 4). This causes the inconvenience that reliable sealing performance cannot be obtained.

[0006] This invention was devised in view of the above-mentioned disadvantages, and the problem to be solved is Constant-velocity joint that provides reliable sealing in the part that is tightened by the joint. Our goal is to provide the best boots.

[0007]

[Means to solve the problem]

The boot of the constant velocity joint of the present invention is connected to one of the two intersecting shafts and has one end. a cylindrical outer joint member with an opening; and a cylindrical outer joint member connected to the other of the two shafts; Constant velocity with an inner joint member disposed coaxially and swingably inside the hand member. With respect to the joint, the outer periphery of the opening of the outer joint member and the outer periphery of the other shaft. The inside of the joint is attached by tightening both ends with a fastening band. In the cylindrical boot that seals, an opening is provided at both ends to be tightened by the fastening band. A cut that does not penetrate in the axial direction from the end face and extends continuously or intermittently in the circumferential direction. It is characterized by having a slit portion formed so as to

[0008]

[Effect]

The boots of the present invention have slits at both ends that are tightened with a fastening band. Therefore, the tightening force of the fastening band becomes partially uneven in the circumferential direction, causing wrinkles on the boots. Even if the product is grown, only the outer part of the slit will wrinkle, and the inner part will have wrinkles. No. Therefore, a gap is formed between the inner peripheral surface of the boot and the outer peripheral surface of the fastened part. The two are in close contact with each other and a reliable seal is obtained.

[0009]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. A cross-sectional view of the boot of this example attached to a constant velocity joint is shown in Figure 1. Figure 2 shows a side view of one end of the tool, and Figure 3 shows a cross-sectional view taken along line III-III in Figure 2. show. The constant velocity joint is the same as the conventional one shown in Figure 6, and the fastening band are the same as the conventional one shown in Figure 7, so their detailed explanation will be omitted and the common The same reference numerals are used for the members.

0010 The boot 1 of this embodiment has one end portion 11 having a small diameter and a ring shape, and the other end portion 11 having a large diameter and a ring shape. an end portion 12; a bellows-shaped, cylindrical central portion 13 connecting the one end portion 11 and the other end portion 12; These are integrally formed from rubber material. An annular groove 14 into which the fastening band 8 is fastened is formed on the outer peripheral surface of the one end portion 11. There is. Further, on the inner circumferential surface of the one end portion 11, an annular ring formed on the outer circumference of the driven shaft 50 is provided. An annular protrusion 15 that matches the engagement groove 55 is formed. And the ring at one end 11 There is a cut between the annular groove 14 and the annular protrusion 15 without penetrating in the axial direction from the opening end surface. A slit portion 16 that extends continuously in the circumferential direction is formed.

[0011] On the other hand, an annular groove 17 is formed on the outer peripheral surface of the other end 12 in the same way as the one end 11. An annular engagement groove 4 formed at the outer periphery of the opening of the outer joint member 4 is formed on the inner peripheral surface of the outer joint member 4. An annular protrusion 18 corresponding to 4 is formed. Then, the annular groove 17 and the annular protrusion 1 A slit portion 19 similar to the slit portion 16 is formed between the slit portion 8 and the slit portion 8 . As shown in FIG. 1, the boot 1 of this embodiment configured as described above has one end thereof. The portion 11 is fitted into the engagement groove 55 of the driven shaft 50, and the other end 12 is fitted into the engagement groove 55 of the outer joint member 4. The fastening bands 8 are fitted into the matching grooves 44, and the fastening bands 8 are fastened to the respective annular grooves 14 and 17. It is installed by being installed. In this case, when tightening the fastening band 8, Even if wrinkles occur in the boot 1 due to uneven tightening force of the band 8 in the circumferential direction, Only the outer portions of the ret portions 16 and 19 are wrinkled, and the inner portions thereof are not wrinkled. do not have. Therefore, the inner circumferential surfaces of both ends 11 and 12 are the same as the outer circumferential surface of the opening of the outer joint member 4. The outer circumferential surface of the driven shaft 50 and the driven shaft 50 are in close contact with each other without any gaps, and there is no space inside the joint. The lubricating oil sealed in the parts is securely sealed to prevent leakage.

0012 As described above, according to the boot 1 of this embodiment, the fastening band 8 tightens the Since slits 16 and 19 are provided at both ends 11 and 12, the sealing surface A reliable seal can be obtained. Note that the slit parts 16 and 19 in the above embodiment extend continuously in the circumferential direction. For example, like the slit portion 26 shown in FIGS. 4 and 5, , a cut is made from the open end surface of the boot 2 without penetrating in the axial direction and is interrupted in the circumferential direction. It may be formed so as to extend. In this case as well, the same operation as in the above embodiment is applied. Use and effect.

[0013]

[Effect of the idea]

According to the boot of the present invention, from the open end surface to both ends to be tightened with the fastening band. A cut that does not penetrate in the axial direction and extends continuously or intermittently in the circumferential direction. Due to the formed slit section, the tightening force of the fastening band is uneven in the circumferential direction. Even if wrinkles occur, the inside part of the slit will not wrinkle. A reliable sealing condition can be obtained on the sealing surfaces at both ends.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a boot according to an embodiment attached to a constant velocity joint.

FIG. 2 is a side view of one end side portion of the boot according to the embodiment.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a side view of one end side portion of a boot according to another embodiment.

FIG. 5 is a sectional view taken along the line V-V in FIG. 4;

FIG. 6 is a sectional view of a conventional boot attached to a constant velocity joint.

FIG. 7 is a side view of a fastening band for fastening the boot.

FIG. 8 is an explanatory diagram showing a state where an inconvenience occurs when the fastening band is tightened.

[Explanation of symbols]

1, 2...Boots 11...One end 12...Other end 16, 19, 26...slit part

Claims (1)

[Scope of utility model registration request] Claim 1: A cylindrical outer joint member connected to one of two mutually intersecting shafts and having one end open; and a cylindrical outer joint member connected to the other of the two shafts and coaxially disposed inside the outer joint member. and an inner joint member disposed so as to be swingable; In a cylindrical boot that is attached by being tightened and seals the inside of the joint, a cut is made at both ends to be tightened by the fastening band so that the cut does not penetrate in the axial direction from the open end surface and extends continuously or intermittently in the circumferential direction. A constant velocity joint boot characterized by having a slit portion formed therein.