JP2998360B2 - Liquid seal structure of brake caliper butt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid seal structure of a caliper butting portion used in a piston-opposed disc brake.

[0002]

2. Description of the Related Art Piston-facing disc brakes
A cylinder is provided for each of the inner caliper and the outer caliper which are divided into two parts and fastened with bolts, and the friction pad is slid on the disc with the piston inserted into the cylinder. It is difficult to provide external brake fluid inlets on the calipers, and even if there is no space restriction, providing separate brake fluid inlets for the inner and outer calipers complicates the external piping. A brake fluid passage that connects the cylinder through the
The brake fluid supplied to the inner caliper is
Generally, it is introduced into the outer caliper.

In this case, the brake fluid passage for communication must be connected by a caliper butting portion, and the connection portion must be liquid-sealed.

The conventional structure adopted for that purpose is as follows:
This is as shown in FIGS. 3 and 4. In the figure, reference numerals 1 and 2 denote divided calipers. Here, for convenience, 1 is assumed to be an inner caliper, and 2 is an outer caliper, but 1 may be an outer caliper and 2 may be an inner caliper.

[0005] Reference numeral 3 denotes a brake fluid passage for cylinder communication provided in each of the calipers 1 and 2, and this fluid passage is connected at a caliper abutting portion and is sealed by an elastic seal ring 4 interposed between the calipers. . In the case shown in the figure, the seal ring 4 is accommodated in a seat hole 5 provided on the abutting surface of the outer caliper 2 and is appropriately compressed in the state of FIG. 4 in which the inner and outer calipers are fastened to fulfill the role of a seal. .

[0006]

In order to assemble the caliper, as shown in FIG. 3, the outer caliper 2 is supported with the mating surface facing up, and then, as indicated by a chain line on the seating surface of the seat hole 5 of the caliper. A method is adopted in which the inner caliper 1 is placed on top and then fastened with bolts. However, according to the above-described conventional liquid-ring structure, the sealing process is performed by vibration or the like in the process until the inner caliper 1 is overlaid. The ring may come off the seat hole. Further, since the seal ring 4 is small, a setting error with respect to the seat hole 5 is likely to occur,
As a result, assembly failure occurs.

For this reason, it is necessary to confirm the seating quality using an expensive detecting device, and if there is a poor seating, it is necessary to correct it.

In order to prevent the seal ring from coming off, it is conceivable to assemble the seal ring with a diameter larger than the diameter of the seat hole so as to have a margin. A part of the ring protrudes between the surfaces, and the fastening state of the caliper becomes unstable. Also, it becomes difficult to press the seal ring into the seat hole.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid seal structure of a caliper abutting portion which does not cause such a problem so that the caliper can be accurately and efficiently performed by an automatic machine.

[0010]

In order to solve the above-mentioned problems, a liquid seal structure according to the present invention has a cylindrical retainer mounted on an outer periphery of an elastic seal ring for sealing a connection portion of a brake fluid passage. Is pressed into a seat hole for inserting a seal ring provided on a mating surface of one of the calipers, and the seal ring is fixed to the one of the calipers.

[0011]

[Function] The seating quality of the seal ring can be judged from the quality of the press-fitting of the retainer into the seat hole. On the other hand, the quality of the press-fitting of the retainer can be easily detected from the press-fitting resistance and the press-fitting stroke. The setting mistake of the seal ring can be eliminated.

Further, if the seal ring is fixed to one of the calipers by press-fitting the retainer, the seal ring does not come off even if it is subsequently subjected to vibrations. Further, when the retainer is press-fitted, it becomes easier to press-fit the seal ring than when directly press-fitting the seal ring into the seat hole, and the seal ring does not protrude between the caliper mating surfaces.

[0013]

1 and 2 show an embodiment of the present invention. As shown in the figure, a cylindrical retainer 6, preferably made of metal, is integrally attached to the outer periphery of a seal ring 4 made of rubber or the like.

The fixing of the retainer 6 to the seal ring 4 is as follows: (1) When the ring 4 is formed, a part of the retainer 6 is buried in rubber. (2) Adhere. (3) Pressing the retainer into the outer periphery of the seal ring can be appropriately performed.
To fix the seal ring 4 to one caliper (the outer caliper 2 in the figure). And outer caliper 2
Then, the inner caliper 1 is butted, and both calipers are fastened with bolts to obtain the state shown in FIG.

If a counterbore 7 larger than the diameter of the seat hole is provided at the inlet of the seat hole 5 as shown in the figure, the axial compression allowance of the seal ring is increased in order to increase the surface pressure of the seal portion. Part of the ring also escapes to the counterbore and does not enter between the mating surfaces, so that the adhesion of the caliper mating surfaces can be maintained. If the counterbore portion 7 is provided, the retainer 6 is provided with a flange 8 or the like which fits in the counterbore portion, and is used as a means for restricting the amount of press-fit of the retainer into the seat hole 5 or as a clue for removing the seal when replacing the seal. This is more advantageous in terms of accurate mounting of the seal ring, easy attachment and detachment, and the like.

[0016]

As described above, according to the present invention, the setting error of the seal ring and the detachment after the setting are eliminated, and the operation is also prevented from being complicated. Unmanned operation can be realized, which is advantageous in terms of improving productivity.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid seal portion of FIG. 1 before assembly.

FIG. 3 is a cross-sectional view showing a procedure for assembling a conventional liquid seal portion.

FIG. 4 is a cross-sectional view of an assembled state of the liquid sealing unit according to the first embodiment.

[Explanation of symbols]

 1 inner caliper 2 outer caliper 3 brake fluid path 4 seal ring 5 seat hole 6 retainer 7 counter bore 8 flange

──────────────────────────────────────────────────続 き Continuation of the front page (56) Reference actual opening Sho 61-57238 (JP, U) actual opening Sho 60-169435 (JP, U) actual opening Sho 54-99975 (JP, U) actual opening Sho 50- 111587 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 55/22 F16D 55/228 F16D 65/02

Claims (2)

(57) [Claims] 1. An inner caliper and an outer caliper, each having a cylinder and a piston, are butted in the axial direction of a disk and fastened by bolts, and further, the inner and outer cylinders are connected via a brake fluid passage passing through the butted portion. And a cylindrical retainer is attached to the outer periphery of an elastic seal ring that is disposed between the inner and outer calipers to seal the connection portion of the brake fluid path, and this retainer is attached to one of the calipers. A liquid seal structure for a butt portion of a brake caliper, wherein the seal ring is fixed to one of the calipers by press-fitting into a seat hole for inserting a seal ring provided in a mating surface of the brake caliper. 2. A counterbore portion having a diameter larger than that of the counterbore is formed at an entrance of the counterbore, and the retainer is provided with a means for restricting an amount of press-fit of the retainer to be accommodated in the counterbore. The liquid seal structure of the brake caliper butt portion described.