JPH07125630A - Servo type brake for vehicle - Google Patents

Abstract

PURPOSE: To eliminate a reservoir hose and simplify a structure of a pipe for hydraulic pressure and reduce its weight by integrating a reservoir tank with a second master cylinder operating a second brake. CONSTITUTION: A first brake 10 and a second brake 20 are provided across front wheels, hydraulic pressure is supplied to the first brake 10 through a hose for first master 31 from a first master cylinder 30 supported on a handle, and the first brake 10 and the second brake 20 are connected by a second master cylinder 40 to supply hydraulic pressure generated in the second master cylinder 40, namely, servo pressure to the second brake 20 through a hose for servo 41. Moreover, a reservoir tank 50 is integrally provided in the second mater cylinder 40. A reservoir hose connecting both members becomes useless and can be omitted owing to this integration. Furthermore, air exhaust operation inside the reservoir hose becomes unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo type brake for a vehicle in which a pipe for transmitting hydraulic pressure is shortened.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open No. 59-105590 discloses that
An example of a servo-type brake for a front wheel of a motorcycle is shown. This has a first and a second brake, each brake is provided with a disc rotor and a caliper, the first brake is connected to the first master cylinder, and is a movable arm rotatably attached to a front fork. The movable arm is rotatable by the braking torque of the first brake. A second master cylinder is connected between the first brake and the second brake, and a movable arm that rotates during braking of the first brake generates servo pressure in the second master cylinder to operate the second brake. Has become. The reservoir tank of the second master cylinder is provided at a position on the spring near the handle, and is connected to the second master cylinder by a reservoir hose.

[0003]

By the way, when the second master cylinder is mounted in the vicinity of the handle or the like, it is inevitable to lengthen the reservoir hose, so that the number of components is increased by the amount corresponding to the reservoir hose and the hydraulic hose is used. The piping structure becomes complicated and the weight becomes heavy. In addition, when air is removed from the reservoir hose during installation, this air also becomes difficult to remove. Then, this invention aims at solving such a problem.

[0004]

In order to solve the above problems, a motorcycle brake according to the present invention comprises a first brake and a second brake provided on the same wheel, and
When the first master cylinder is connected to the brake, the first brake and the second brake are connected via the second master cylinder, and when the first brake is operated by the hydraulic pressure of the first master cylinder, the braking A servo-type brake for a vehicle in which a servo pressure is generated in a second master cylinder by a torque to operate a second brake, wherein a reservoir tank is integrated with the second master cylinder.

[0005]

Since the reservoir tank is integrated with the second master cylinder, it is not necessary to connect both members with the reservoir hose. As a result, the number of parts is reduced by the amount corresponding to the reservoir hose, the hydraulic piping structure is simplified and the weight is reduced, and air removal from the reservoir hose at the time of mounting is also unnecessary.

[0006]

EXAMPLE An example will be described with reference to FIG. The present embodiment relates to a front wheel disc brake of a motorcycle, in which the first brake 10 is sandwiched by front wheels (not shown) supported by the lower ends of the left and right front forks 1, 2.
The second brake 20 is provided.

Hydraulic pressure is supplied to the first brake 10 from a first master cylinder 30 supported by a handle (not shown) via a first master hose 31 to connect the first brake 10 and the second brake 20. Second master cylinder 4 between
0, and the hydraulic pressure generated in the second master cylinder 40, that is, the servo pressure, is transferred to the second via the servo hose 41.
It is supplied to the brake 20.

The second master cylinder 40 is integrally mounted on the mounting portion 42 by a bolt 5 to a stay 4 projecting rearward and obliquely upward from a part of the boot 3 provided at the lower end of the left front fork 1. Has been done.

A reservoir tank 50 is integrally provided in the second master cylinder 40, and its liquid chamber 51 and the liquid chamber 43 of the second master cylinder 40 are communicated with each other through a communication hole 53 formed in a partition wall 52. There is.

The first brake 10 is provided with a first disc rotor 11 and a first caliper 12 mounted on the lower end of the left front fork 1 via an axle 6, and the first caliper 12 rotates the first disc rotor 11. Direction (arrow direction)
The pistons 13 and 14 of different diameters whose front side is smaller than
And is attached to the intermediate portion of the movable arm 7 by a bolt 15.

One end of the movable arm 7 is rotatably attached to a stay 8 protruding rearward from the lower end of the boot 3 by a bolt 9, and the other end has one end of a push rod 44 of a second master cylinder 40 attached to the bolt 16. Is pivoted by.

The other end of the push rod 44 has a spherical portion 45.
A return spring 48 is provided between the push rod 44 and the cylinder 47, which contacts the piston 46 and generates a spring force in a direction to push the push rod 44 out of the cylinder 47 when a braking torque is generated.

At the highest position of the corner of the cylinder 47 in the mounted state, the servo hose 41 is provided.
A discharge port 49 communicating with the air chamber is provided so that the air in the cylinder 47 at the time of mounting can be quickly sent into the servo hose 41 together with the pressure liquid in the liquid chamber 43.

The second brake 20 side is also provided with a second disk rotor 21 and a second caliper 22. The second caliper 22 is provided with pistons 23 and 24 having different diameters, and although not visible in the figure, the right front side is provided. It is fixedly attached to the lower part of the fork 2.

Next, the operation of this embodiment will be described. Now, when the brake is applied in the illustrated state, the first master cylinder 3
The hydraulic pressure is supplied to the first caliper 12 from 0, and the brake pads (not shown) are pressed against both side surfaces of the first disc rotor 11 by the pistons 13 and 14, and the movable arm 7 causes the first disc to move by the braking torque generated at this time. Rotor 1
1 in the direction of rotation, and as a result, the push rod 44
Is pushed into the cylinder 47 against the return spring 48.

Therefore, a servo pressure is generated in the liquid chamber 43,
It is transmitted from the discharge port 49 of the cylinder 47 to the second caliper 22 via the servo hose 41, and each piston 2
By operating 3, 24, the second brake 20 side also operates.

At this time, since the reservoir tank 50 is integrated with the second master cylinder 40, the conventional reservoir hose for connecting the two members is unnecessary and omitted, so that the parts are reduced by the amount corresponding to the reservoir hose. As a result, the hydraulic piping structure is simplified and the weight is reduced.

Moreover, the air bleeding operation inside the reservoir hose, which is conventionally required when mounting, becomes unnecessary. Further, the air in the reservoir tank 50 can be easily removed from the lid 54 or the like.

Even if air exists in the second master cylinder 40 at the time of mounting, this air exists in the corner portion of the highest position of the cylinder 47,
Promptly enter the servo hose 41. Therefore, when the second caliper 22 is attached, it is possible to easily bleed the air by lifting it higher than the second master cylinder 40 in advance.

[0020]

In the servo type brake for vehicle according to the invention of the present application, since the reservoir tank is integrated with the second master cylinder, it is not necessary to connect both members with the reservoir hose as in the conventional case, and the reservoir is not required. The hose can be omitted.

As a result, it is possible to reduce the number of parts, simplify the hydraulic piping structure, and reduce the weight. In addition, it is not necessary to bleed air in the reservoir hose when attaching the reservoir tank, which is conventionally done.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment in which first and second brakes are shown at the same time.

[Explanation of symbols]

1: left front fork, 2: right front fork,
7: movable arm, 10: first brake, 11: first disc rotor, 12: first caliper, 20: second brake, 21: second disc rotor, 22: second caliper,
30: first master cylinder, 40: second master cylinder, 50: reservoir tank

Front page continuation (72) Inventor Kaoru Yamamoto 8-18-4 Nobori, Niiza-shi, Saitama Inside Honda Racing Co., Ltd. (72) Inventor Albert Giorgetti, Bergamo Terno di Zora beer Blav 24, Italy

Claims (1)

[Claims] 1. A first brake and a second brake provided on the same wheel, the first master cylinder is connected to the first brake, and the first brake and the second brake are connected via a second master cylinder. When the first brake is operated by the hydraulic pressure of the first master cylinder, the servo torque for the second master cylinder is generated by the braking torque to operate the second brake. A servo-type brake for a vehicle, characterized in that a reservoir tank is integrated with the second master cylinder.