JPS6147333B2 - - Google Patents

Abstract

PURPOSE:To eliminate oil pressure pipings exposed to the outside, by building an oil pressure generating machine in a shaft that oscillation supports a caliper. CONSTITUTION:A support shaft 9 piercing a hole portion 10a of a fixing portion 10 penetrates a hole portion 4a of a caliper 4, and supports the caliper 4 in an oscillation-possible shape. When right pulling a rope 21 interlocking with a braking functioning lever, a piston 14 smoothly fitted into a cylinder 13 right moves, and oil pressure is generated in an oil chamber 22. Oil pressure reaches the inside of an oil pressure functioning cylinder in the caliper 4 through a flow path in the caliper 4, thus working a disc brake. Since an oil pressure generating machine is built in the support shaft 9 as a fixing body, the trouble of the failure of oil pressure pipings can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a hydraulically operated tailing disc brake.

Hydraulically actuated disc brakes are mechanically simple and are used in various types of vehicle brake systems. The structure is generally such that hydraulic pressure is generated in a master cylinder by mechanical operation of a brake lever or brake pedal, and the hydraulic pressure is transmitted to a brake device via hydraulic piping.

In such a system, hydraulic pressure must be reliably transmitted to the brake device, and therefore, damage to the hydraulic piping must be avoided at all costs. As a countermeasure against this problem, conventional systems have been devised to have two independent hydraulic systems, but in motorcycles, etc., the disc brake system hydraulic piping is usually exposed to the outside, and the concept of compensation in the event of piping loss is not suitable. It is still difficult to say that the effect is sufficient.

Therefore, in the present invention, the tailing type disc brake, which is mainly provided as a brake device for motorcycles, has a support shaft that swingably supports the caliper disposed at the edge of the disc rotor. Focusing on the fact that the shaft is relatively long in the axial direction, the present invention provides a tailing disc brake that completely eliminates the need for conventional externally exposed hydraulic piping by incorporating a hydraulic pressure generator within this support shaft. It was made for the purpose of That is, the features of the present invention include a support shaft extending from the vehicle body fixed part parallel to the tangent line of the disc rotor, a pair of friction pads disposed on both sides of the disc rotor, and a pair of friction pads located on opposite sides of the disc rotor. A tail that has a built-in hydraulic operating mechanism in one side of the part to press the friction pad on one side against the disc rotor, and a caliper that presses the friction pad on the other side against the disc rotor by swinging around the support axis. In the bearing type disc brake, a cylinder is formed inside the support shaft, extending in the axial direction and hydraulically communicating with the hydraulic operating mechanism through internal flow paths of the support shaft and the caliper, A hydraulic pressure generating piston biased toward one end by the biasing force of a spring is slid into the cylinder to form a master cylinder mechanism, and the piston is further connected to an external brake cable to operate the brake. A tailing disc brake with a built-in master cylinder is characterized in that the piston is pulled against a spring force to generate hydraulic pressure.

The present invention will be described below based on an embodiment shown in the drawings.

In the figure, 1 is a disc rotor, 2 and 3 are friction pads arranged on both sides of the disc rotor 1, and 4 is a caliper arranged to sit on the edge of the disc rotor 1. The cylinder 5 has a cylinder 5 that accommodates a hydraulic piston 7 which presses the friction pad 2 on one side against the disc rotor 1 on one side of the opposite part that is supported so as to be swingable. It is configured to swing by the pressure reaction force of the hydraulic piston 7 so that the reaction part 6, which is the other opposing part, presses the friction pad 3 on the other side against the disc rotor 1. 8 is an oil chamber.

Such a configuration is known, and the present invention is characterized in that the support shaft 9 has a built-in hydraulic pressure generator. That is, the support shaft 9 passes through a hole 10a formed in the vehicle body fixing part 10 and a hole 4a formed in the caliper 4, and has a stopper 11 fixed to one end and a plug 12 screwed to the other end. Therefore, the vehicle body fixing portion 10 and the caliper 4 are provided so as to be integrally held together, and the caliper 4 is supported by the vehicle body fixing portion 10 so as to be allowed to swing around the axis. The stopper 11 and the plug 12 each serve as a torque receiving portion during brake operation.

13 is a cylinder formed within the support shaft 9;
Reference numeral 14 denotes a hydraulic pressure generating piston that is slidably fitted to this cylinder 13, and is normally biased by the biasing force of a spring 15 so as to engage with the inner end surface of the plug 12. Reference numerals 16 and 17 designate spring seats 18 and 19, respectively, as piston cups, and 20 represents a rod having one end connected to the piston 14 and the other end passing through the support shaft 9 in the axial direction and connected to a cable 21. For example, by pulling the brake cable 21 to the right in the figure in conjunction with a brake operating lever provided on a handle (not shown), the piston 14 is moved in the same direction, reducing the internal volume of the oil chamber 22 and increasing the oil pressure. generate. This oil pressure is applied to the flow path 9a of the support shaft and the flow path 4 of the caliper 4.
It is transmitted to the oil chamber 8 via b.

Note that the check valve mechanism 23 built into the piston 14 closes the oil chamber 22 and the plug 12 during non-braking.
It forms a return port that communicates with a reservoir (not shown) via a flow path 24 formed in the piston 14, and a flow path 14a formed in the piston 14.
The one-way sealing property of the piston cup 18 allows oil to leak from the reservoir only in the direction of the oil chamber 22.

According to the above configuration, the master cylinder, which is the hydraulic pressure generator, is built into the tailing type disc brake, so external hydraulic piping is not required, and the problems caused by missing hydraulic piping as in the past are completely eliminated. Moreover, since the master cylinder is built into the support shaft, which is a fixed body, the mechanical tensile force that acts to generate oil pressure has no effect on the rocking of the disc brake caliper, making it difficult to use in practical use. The benefits above are extremely large.

[Brief explanation of the drawing]

The drawings show an embodiment of a tailing type disc brake according to the present invention, and FIG. 1 is a partial plan cross-sectional view of the disc brake, and FIG. 2 is a partial vertical cross-sectional side view. 1... Disc rotor, 2, 3... Friction pad, 4... Caliper, 4a... Hole, 4b... Channel, 5... Cylinder, 7... Piston, 9... Support shaft, 10... Fixed part, 10a... Hole part, 1
1...Stopper, 12...Plug, 13...Cylinder, 14...Piston for generating hydraulic pressure, 15...Spring, 16, 17...Spring seat, 18,
19... Piston cup, 20... Rod, 21
... Cable, 22 ... Oil chamber, 23 ... Check valve mechanism, 24 ... Channel.

Claims (1)

[Claims] 1. A support shaft extending from the fixed part of the vehicle body parallel to the tangent line of the disc rotor, a pair of friction pads arranged on both sides of the disc rotor, and one side of the opposing part sandwiching the disc rotor. In a tailing type disc brake, the tailing type disc brake is equipped with a built-in hydraulic actuation mechanism that presses the friction pad on the other side against the disc rotor, and a caliper that presses the friction pad on the other side against the disc rotor by swinging around the support axis, The inside of the support shaft is arranged in the axial direction,
and forming a cylinder hydraulically communicated with the hydraulic operating mechanism via the support shaft and the internal flow path of the caliper, and incorporating a hydraulic pressure generating piston in the cylinder to form a master cylinder mechanism therein; Furthermore, this hydraulic pressure generating piston is
A tailing disc brake with a built-in master cylinder, characterized in that it is mechanically connected to a brake cable external to a support shaft so that the brake cable can be towed.