JP3513686B2 - Caliper body of vehicle disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a closing member from being unscrewed, and stably retain the sealed properties of a hydraulic chamber, by threadably arranging the closing member in a machining hole for penetratingly forming a cylinder hole, and forming on the closing member, an engaging part with which a threadably moving tool is only engaged in a threadably engaging direction. SOLUTION: In cylinder holes 6, 7, a machining hole 11 whose diameter is smaller than the cylinder hole 6 is opened from the anti-disc rotor side of one operating part 3, and the cylinder hole 6 of one operating part 3 is penetratingly formed from this machining hole 22 by an excavating tool. The bottomed cylinder hole 7 is formed in the other operating part 4 by utilizing this cylinder hole 6, and a closing member 12 is threadably engaged with the machining hole 11, so that the bottom of the cylinder hole 6 is closed. Engaging parts 12e are so formed that a closing member screwing tool is engaged with a threadably engaging direction only. This caliper body is thusly formed, thereby the closing member 12 can not be threadably moved carelessly after threadably engaged with the machining hole 11 in a job site, and also a metal seal part 12c is liquid-tightly closed, therefore the sealed properties of a hydraulic chamber 14 can be stably retained for a long time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper body of a vehicle disc brake.

[0002]

2. Description of the Related Art For example, a caliper body of a vehicle disc brake disclosed in Japanese Examined Patent Publication No. 61-52331 and Japanese Utility Model Laid-Open No. 6-69456 has a pair of acting portions facing each other on both sides of a disc rotor. A cylinder hole of the acting portion is formed through a processed hole formed on the side opposite to the disk rotor of the acting portion, and a cylinder hole is formed in the other acting portion by utilizing this cylinder hole to close the processed hole. Is blocked.

[0003]

However, the above-mentioned closing member is formed with an engaging portion with which a screwing tool is engaged. The engaging portion is formed in the screwing direction and the screwing-out direction. Therefore, if it is screwed carelessly after screwing the closing member in the factory, the sealing performance of the hydraulic chamber formed at the bottom of the cylinder hole may be affected.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a caliper body for a vehicle disc brake which prevents the closing member from being unscrewed and stabilizes the sealing performance of the hydraulic chamber.

[0005]

In order to achieve the above-mentioned object, the present invention forms a cylinder hole through a machined hole formed on the side opposite to the disk rotor of the operating portion, and forms the machined hole by a closing member. In a caliper body of a vehicle disk brake that is closed, the means of claim 1 is such that the closing member is provided so as to be screwed into the processing hole, and the closing member includes:
The tool for screwing is characterized by forming an engaging portion which engages only in the screwing direction, and in the means of claim 2, the closing member includes a plug body for closing the bottom portion of the cylinder hole, It is characterized in that it is configured with a screw member that is screwed to the plug body, and that the screw member is provided with an engaging portion with which a screwing tool is engaged only in the screwing direction.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail based on the embodiments shown in the drawings. 1 and 2 show a first embodiment of the present invention, in which a caliper body 1 of a vehicle disc brake is a disc rotor 2
The acting portions 3 and 4 are arranged opposite to each other on both sides, and the acting portions 3 and 4 are connected by the bridge portion 5 that straddles the disc rotor 2.
By the pistons 8 and 9 which are inserted in the cylinder holes 6 and 7 respectively formed in both acting portions 3 and 4 so as to be liquid-tight and movable,
Friction pads 10 arranged on both sides of the disc rotor 2,
10 is pushed to perform a braking action.

In the cylinder holes 6 and 7, a machining hole 11 having a diameter smaller than that of the cylinder hole 6 is bored from the side opposite to the disk rotor of the one action portion 3, and the one of the action portion 3 is drilled from this machining hole 11 by an excavating tool. The cylinder hole 6 is formed through. Next, the cylinder hole 6 is utilized to form a bottomed cylinder hole 7 in the other action portion 4, and the closing member 12 is screwed into the processing hole 11 to close the bottom portion of the cylinder hole 6.

The closing member 12 has a small-diameter plug body 12a for closing the bottom of the cylinder hole 6 from the side of the cylinder hole 6 and a male screw threaded on the outer circumference of the female thread 11a engraved in the processing hole 11. The external thread portion 12b is integrally formed, and a tapered metal seal portion 12c is provided between the plug body portion 12a and the external thread portion 12b so as to be in close contact with the step portion 13 between the cylinder hole 6 and the machining hole 11. is doing.

Further, the closing member 12 has an engaging portion 12e formed on an outer surface 12d on the side opposite to the disk rotor, with which a tool for screwing the closing member is engaged. The engagement portion 12e is formed by a wedge-shaped projection so that the tool for screwing the closing member engages only in the screwing direction.

With this construction, after the closing member 12 is screwed in the factory, the closing member 12 cannot be screwed carelessly, and the metal seal portion 12c is in close contact with the step portion 13 and is liquid-tight. Block the bottom of the cylinder hole 6 and the piston 8
The sealability of the fluid pressure chamber 14 defined between and can be maintained stably for a long period of time. Further, since the metal seal portion 12c is brought into close contact with the stepped portion 13, like the elastic seal member. Since the periodical replacement work is not required, it is not necessary to remove the closing member 12.

FIGS. 3 and 4 show a second embodiment of the present invention, in which one working portion 21 of the caliper body 20 has a cylinder hole 22 and a machining hole 23 having a diameter larger than that of the cylinder hole 22. And a closing member 24 is screwed into the processed hole 23.

The closing member 24 is composed of a plug 25 for closing the bottom of the cylinder hole 22 from the side of the processing hole 23, and a male screw member 26 having an external thread formed on the outer periphery thereof to be screwed into a female screw engraved in the processing hole 23. The plug body 25 is formed with a tapered metal seal portion 25a that tightly adheres to the step portion 27 between the cylinder hole 22 and the processing hole 23 and closes liquid-tightly, and the outer surface 26a of the male screw member 26 is closed. A concave engaging portion 26b is formed with which the tool for screwing the member engages only in the screwing direction.

As a result, since the closing member 24 cannot be screwed carelessly after the closing member 24 is screwed in the factory, the sealing property of the hydraulic chamber 28 can be stably maintained for a long period of time.

FIGS. 5 and 6 show a third embodiment of the present invention. A cylinder hole 32 and a machined hole 33 having a diameter smaller than that of the cylinder hole 32 are provided in one acting portion 31 of the caliper body 30. Is formed, and the processed hole 33 is formed in the closing member 3
It is closed at 4.

The closing member 34 is composed of a plug 35 that closes the bottom of the cylinder hole 32 from the cylinder hole 32 side, and a screw member 36 that is screwed into the plug 35. The stopper 35 is
The screw member 3 has a large-diameter portion 35a that closes the bottom of the cylinder hole 32 and a male screw portion 35b that is screwed into the screw member 36.
Reference numeral 6 denotes a nut body having a diameter larger than that of the machined hole 33, and has a female thread portion 36a in the central portion to which the male thread portion 35b is screwed. The outer surface 36b has a concave shape with which a screwing tool is engaged only in the screwing direction. The engaging portion 36c is formed.

With this structure, the screw member 36 is screwed to the male screw portion 35b of the plug 35 inserted from the cylinder hole 32 side, and the screw member 36 is tightened in the screwing direction with a screwing tool. , The metal seal portion 35c of the plug 35
Adheres to the step portion 37 between the cylinder hole 32 and the processed hole 33 to liquid-tightly close the bottom portion of the cylinder hole 32.

As a result, since the screw member 36 cannot be screwed carelessly after the closing member 34 is attached in the factory, the sealing property of the hydraulic chamber 38 can be stably maintained for a long period of time.

[0018]

As described above, in the caliper body of the vehicle disc brake according to the present invention, in the means of claim 1, the closing member for closing the processing hole formed through the cylinder hole can be screwed into the processing hole. And the closing member,
The tool for screwing forms an engaging portion that engages only in the screwing direction, and in the means of claim 2, the closing member includes a plug body that closes the bottom of the cylinder hole, and a screw member that is screwed into the plug body. The screw member is formed with an engaging portion that allows the screwing tool to engage only in the screwing direction, so the screwing of the closing member is prevented and the sealing performance of the hydraulic chamber is stable for a long period of time. Can be maintained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a caliper body showing a first embodiment example of the present invention.

FIG. 2 is a perspective view of the closing member.

FIG. 3 is a sectional view of a caliper body showing a second embodiment of the present invention.

FIG. 4 is a perspective view of the closing member.

FIG. 5 is a sectional view of a caliper body showing a third embodiment of the present invention.

FIG. 6 is a perspective view of the closing member.

[Explanation of symbols]

1, 20, 30 ... Caliper body, 3, 21, 31 ... Working portion, 6, 22, 32 ... Cylinder hole 11, 23, 33
... Processed holes, 12, 24, 34 ... Closing members, 12e, 26
b, 36c ... Engaging portion, 25, 35 ... Plug body, 26 ... Male screw member, 36 ... Screw member

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16D 65/20 F16D 55/228 F16D 65/02

Claims (2)

(57) [Claims] 1. A caliper body for a vehicle disc brake, wherein a cylinder hole is formed through a machined hole formed on the side opposite to the disk rotor of a working portion, and the machined hole is closed by a block member. A caliper body for a vehicle disc brake, which is provided so as to be screwed into a processing hole, and in which the closing member is formed with an engaging portion with which a screwing tool is engaged only in the screwing direction. 2. A caliper body of a vehicular disc brake, wherein a cylinder hole is formed through a processed hole formed on the side opposite to the disk rotor of the action portion, and the processed hole is closed by a closing member. A stopper for closing the bottom of the cylinder hole, and a screw member screwed into the stopper,
A caliper body for a vehicle disc brake, wherein an engaging portion for engaging a screwing tool only in the screwing direction is formed on the screw member.