JPS6040830A - Disc brake - Google Patents

Abstract

PURPOSE:To facilitate machining of an oil passage and to reduce flow resistance of oil, by a method wherein an oil passage, through which the upper part of the bottom of a master cylinder is communicated with the base of a reservoir tank, is provided, and an air vent hole, formed in the upper part of a body, and an oil passage, which interconnects the wheel cylinder and the reservoir tank, are coaxially communicated with each other. CONSTITUTION:A master cylinder 9, extending longitudinally, is situated to the lower part of a body 1, and a master piston 10, forcibly pressed by a press rod 8, is interposed thereinto. A screw part 11a is formed in an opening part at the upper part of a reservoir tank 11, and a gathering part 11b is provided in the bottom of the tank. A wheel cylinder 14, which is positioned above the cylinder 9 and open to the side located opposite to a disc plate, is commuicated with the bottom of the reservoir tank 11 through an oil passage 15, and an air vent hole 16 is formed coaxially with the oil passage 15. The upper part of the bottom of the master cylinder 9 is communicated with the bottom of the reservoir tank 11 through the oil passage 17. The oil passages 15 and 17 may be easily machined.

Description

DETAILED DESCRIPTION OF THE INVENTION The second field of 'P'e business' The present invention relates to disc brakes (C) used for bicycles, master cylinders, wheels/linders, etc.
and a disc brake that is provided between the two or has a reservoir tank formed integrally with the disc brake.

Conventional configuration and its problems Oil disc brakes (In C, a connecting oil passage is provided between the master cylinder, wheel-and-linder, and reservoir tank, but when these three are integrated into one, it is possible to reduce the size and weight.) Each connecting oil road is intricate and complex.

In the conventional case, when forming an oil passage that communicates the wheel/linder with the master turn cylinder or reservoir tank, each cylinder and the oil passage (the arm directions are different, so simultaneous machining is not possible; υ11 is required, or the hole (r
- From the middle of the day, it was configured to function as a communication/llll road. Therefore, the hole on the IA side of the main body becomes a waste hole and cannot be used as a base later, making it necessary to remove the hole, causing inconveniences such as oil leakage and lack of smooth oil flow. there were.

OBJECT OF THE INVENTION The present invention eliminates the above-mentioned inconveniences and forms communication oil passages between cylinders without the need for holes. : Provides disc brakes.

Structure of the Invention The disc brake of the present invention includes a master cylinder provided in the front-rear direction at the bottom of the main body, a reservoir tank provided almost vertically in the front of the master cylinder, and an opening on one side of the main body above the master cylinder. It has an integrated wheel cylinder and a roadway that communicates from the upper part of the bottom of the master cylinder to the bottom of the reservoir tank, as well as an air vent opening on the top surface of the main body, and a roadway that connects the wheel cylinder and the bottom of the reservoir tank on the same axis. This is what was communicated with.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a complete right side view of a disc brake according to the invention. 1 is a main body, an outer wire 3 is attached to an arm 2 provided at the lower front, and an inner wire 5 is connected to the tip of a crank 4 pivotally supported at the rear. Reference numeral 6 denotes a connecting portion that projects upward from the front of the main body, and this portion is attached to the bracket of the vehicle body together with the holder of the fixing pad. The end is a disc plate fixed to the hub axle of the rear wheel.
When the brake lever is operated and the wire 5 is pulled fully forward, the crank 4 rotates, and the push rod 8 supported by the crank 4 pressurizes the master piston, which will be described later, so that the pad fully presses the disc plate and performs braking. It has become.

To explain the inside of the main body 1 with reference to FIG. 2, a master cylinder 9 is provided in the lower part in the front-rear direction, that is, approximately parallel to the disk plate, and a master piston 10 pressed by a push rod 8 is inserted into the master cylinder 9. ing. Reference numeral 11 designates a reservoir tank provided in a substantially vertical direction in front of the cylinder 9, and has a threaded portion 11a at its upper opening and a small-diameter reservoir portion 11bf at its bottom. 12 is head p%
151r A threaded portion 12ai is provided to be screwed into the threaded portion, or a reservoir piston is used to attach the /- cylinder 13, and a tapered portion 12b of a size that closes the opening of the housing portion 11b is provided at the tip. It is set up.

A wheel piston is inserted here that presses the rotating pad against the disk plate. 16 A road connecting the bottom of the beam server/beam 11 and the wheel cylinder 14, 16
is an air vent hole provided coaxially with the roadway 15, and the hole 16 is sealed with a seal fitted with a sealing material. 17 is the bottom upper part of the master'/7der 9.
It is a road that connects the bottom of the mountain.

, Figure 3 is a plan view of the disc brake, 18 is a holder holding the rotating pad 19, 20 is a fixed pad 2.
1 is a holder, and 22 is a lid that covers the reservoir tank 11 and the air vent hole.

When the push rod 8 pushes the master piston 1o forward by operating the brake lever, the oil pressure in the cylinder 9 is applied to the road 17. The reservoir piston 12 is applied to the wheel cylinder 14 through the road 15 through the reservoir tank 11. The reservoir piston 12 is lowered by rotating operation to adjust the oil pressure when the pad wears out.
Even if these are lowered all at once, the roads 16 and 17 are communicated through the gap formed around the tapered portion 12b. The reservoir portion 11b acts as a dirt storage portion, and the piston 12 descends all at once to fill the tank 11.
When the amount of oil inside decreases, the tip of the tapered portion 12b closes the opening of the collecting portion 11b, thereby preventing dust from flying up.

Effects of the Invention The disc brake main body 1 according to the present invention includes a master cylinder 9 provided in the front-rear direction, and a wheel cylinder 14 provided almost vertically at the front of the master cylinder 9 or opened toward the disc plate side above the reservoir tank 11 and the cylinder 9. Since the cylinder and the bottom of the reservoir tank are arranged in close proximity, the road 15. , 17 are easy to form, and the oil flow resistance can be reduced.

Since the roadway 17 can be formed at the same time as the cylinder 9, there is no need for post-processing or drilling. Since the roadway 15 is formed coaxially with the air vent hole 16, there are no holes or joints, there is no oil leakage, and the width can be reduced to a wide width. Furthermore, since one reservoir tank is vertical, refueling is easy, and since the master cylinder 9 is oriented in almost the same direction as the wire, the crank mechanism can also be simplified.

[Brief explanation of the drawing]

FIG. 1 is a right side view of a disc brake according to the present invention, FIG. 2 is a side view of the same main part in cross section, and FIG. 3 is a plan view. 1...Main body, 9. Master shilling-511.
...IJ sa/<-tank, 14... Wheel cylinder, 16.17... Road, 16 ・Air vent hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 2θ

Claims (1)

[Claims] A master turn cylinder installed in the front and back direction at the bottom of the main body,
It has a reservoir tank installed almost vertically in the front part of the master cylinder, and a wheel/cylinder that is opened on the -II1 side of the main body above the master cylinder, and the reservoir tank is installed in the front part of the master cylinder in an almost vertical direction. In addition to installing an oil pipe that connects to the bottom of the tank,
A disc brake that has an air vent hole opened on the top surface of the main body, and an oil passage coaxially communicating between the wheel/cylinder and the bottom of the reservoir tank.