JPS6133309Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dustproof boot fixing structure in which both ends of the boot are attached to a fitting body and a fitting body which rotate relative to each other.

There are cases in which one opening of the dustproof boot is fixed to the mating body and the other opening to the mating body to protect the sliding surface between the mating body and the mated body, which rotate relative to each other, from dust and water. be.

The present invention relates to an improvement of the fixing structure of this type of dustproof boot. First, a conventional example of a dustproof boot fixing structure will be explained.

Figure 1 shows a disc brake with a built-in parking brake, where 1 is the boss of the caliper body which is the mating body, 2 is the pin which is the mating body, and the pin 2 rotates around its axis by operating the lever 3. Then, the rotational torque is transmitted to the piston 4 and the parking brake is activated. The dustproof boot 5' has one open end flange portion 5'a fitted into an annular groove 2a provided on the outer periphery of the pin 2, and the outer edge of the other open end flange portion 5'b fitted into the inner circumference of the boss portion 1. The inner periphery of the other open end flange portion 5'b is in sliding contact with the outer periphery of the pin 2. In the fixing structure of such a dustproof boot, the rubber sleeve provides a crushing margin to the outer and inner edges of one open end flange portion 5'a and the other open end flange portion 5'b of the dustproof boot made of elastomer. This ensured the positioning and sealing performance of the dustproof boot 5'. Therefore, a double seal structure is used for the infiltration channel A along the outer circumference of the pin 2, but a single seal structure is adopted for the infiltration channel B along the boss portion 1 of the caliper body, which is attached to a relatively rotating part. As a dust-proof boot, the sealing performance in the inundation channel B was insufficient.

Therefore, the present invention is a dustproof boot that is attached at both ends to a mating body and a mated body that rotate relative to each other, and has a double seal structure for both the mating body and the mated body. The purpose of this product is to provide dustproof boots.

The present invention will be explained below with reference to FIGS. 2 and 3.
One open end flange portion 5a of the dustproof boot 5 is fitted into the annular groove 6a of the fitted body 6, and the outer edge of the other open end flange portion 5b is fitted into the annular groove 7a on the inner periphery of the fitted body 7.
is fitted and fixed to the other open end flange portion 5.
It is the same as the conventional example in that the inner periphery b is in sliding contact with the outer periphery of the fitting body 6. In the dustproof boot according to the present invention, an outer cylinder 5c is formed on the outside of the other open end flange portion 5b, extending from near the end of the bellows portion and surrounding the outer periphery of the flange portion 5b. The outer cylinder 5c is a fitted body 7 corresponding to the tip of the carrier body boss part.
The outer periphery is wrapped and tightened with a retaining ring 8 so that it is brought into close contact with the outer periphery of the object to be fitted 7.

Therefore, in the present invention, the outer cylinder 5c, which is tightened with the retaining ring 8,
A sealing effect is exerted at two locations: the opening end flange portion 5b and the outer edge of the other open end flange portion 5b.

As can be understood from the above explanation, the fixing structure of the dustproof boot according to the present invention has a double seal structure not only in relation to the fitted object but also in relation to the fitted object. If the present invention is applied to a structure that rotates relative to each other, such as between a caliper body and a pin of a disc brake with a built-in parking brake, the sealing performance of the dustproof boot will be significantly improved.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a parking disc brake equipped with a conventional dust-proof boot, Figure 2 is a vertical cross-sectional view showing the fixing structure of the dust-proof boot according to the present invention, and Figure 3 is a vertical cross-section of the dust-proof boot. FIG. 5: dustproof boot, 5a: one open end flange, 5b: other open end flange, 5c: outer cylinder, 6: fitted body, 6a: annular groove, 7: fitted body,
7a: Annular groove, 8: Retaining ring.

Claims (1)

[Scope of utility model registration request] Fit one open end flange part to the outer periphery of the mating body, fit the outer edge of the other open end flange part to the annular groove on the periphery of the mated body, and fit the inner periphery of the other open end flange part to the mating body. In a dustproof boot that is positioned in sliding contact with the outer periphery of the boot, an outer cylinder is formed on the outside of the flange at the other open end, and the object to be fitted is covered with the outer cylinder and tightened with a retaining ring. Features: A dustproof boot fixing structure that attaches both ends to a mating body and a mating body.