JPS6294462A - Air purging device for hydraulic brake device of motorcycle - Google Patents

Abstract

PURPOSE:To enable easy air purging work by forming an air purging part on the uppermost level of a hydraulic passage connecting a rear master cylinder to a brake caliper for front wheel. CONSTITUTION:One of branches from a rear master cylinder 4 is continuous to a rear brake caliper 7 and the other is connected to a metering valve 11. To the upper end of an air purging pipe 13 connected to said metering valve 11 is fitted an air purging valve 14. In this case, air in hydraulic pipes 8a and 8b is liable to stagnate within the metering valve 11 located at the highest level. However, as the air purging valve 14 is connected to the metering valve 11, air purging work can be easily carried out and working time can be substantially lessened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hydraulic brake system for a motorcycle, particularly a hydraulic brake system in which a rear master cylinder near the brake pedal and a front (front wheel) brake caliper are connected by hydraulic piping. Hydraulic play: 1-Relating to improvement of air bleeding workability in equipment.

[Conventional technology]

Generally, a hydraulic brake device connects a master cylinder and a brake caliper with hydraulic piping, and applies hydraulic pressure generated in the master cylinder by actuation of a brake pedal or brake lever to a piston of the brake caliper.
This allows the disc plate to be held between the disc pads. Recent hydraulic brake devices for motorcycles include those in which a rear master cylinder operated by a brake pedal is connected not only to a rear (rear wheel) brake caliper but also to a front brake caliper through a hydraulic passage.

By the way, in the above-mentioned hydraulic brake device, it is of course necessary to remove air from the piping during maintenance such as replacing the hydraulic oil. In this air bleeding operation, while supplying hydraulic oil, the air in the hydraulic piping is pushed outward from the connection part of the hydraulic piping with the brake caliper together with the hydraulic oil.

[Problem that the invention seeks to solve]

In the hydraulic brake system that connects the rear master cylinder for brake pedal and the front brake caliper,
Since the length of the piping is long and the central part of the piping is higher than the first rear master cylinder and front brake caliper, there is a problem in that the air bleeding operation takes a long time.

The present invention was made in order to solve the problems of these conventional devices, and it is an object of the present invention to provide an air bleed device for a hydraulic brake system for a motorcycle that can perform air bleed work efficiently in a short time. The purpose is

[Means for solving problems]

The present invention provides a hydraulic brake system for a motorcycle in which a rear master cylinder for a brake pedal and a brake caliper for a front wheel are connected by a hydraulic passage, wherein
This is an air bleed device characterized in that an air bleed part is formed at the = part.

[Effect]

Generally, air in hydraulic passages accumulates at the highest point.

However, in the present invention, the air bleed part is provided at the two most parts of the hydraulic passage where air tends to accumulate, so the accumulated air can easily escape to the outside, and therefore the time required for air bleed work can be shortened. Ru.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 are for explaining an air bleed device for a hydraulic brake system for a motorcycle according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a motorcycle, in which an engine 2a is mounted approximately in the center of a vehicle body 2, a front fork 2C supporting a front wheel 2b is mounted at the front, and a rear arm supporting a rear wheel 2d is mounted at the rear. 2e are each pivoted, and the sea) 2f is mounted on the top.

A brake pedal 3 is disposed approximately at the lower center of the vehicle body 2, and a rear master cylinder 4 is disposed above the brake pedal 3.
The piston rod 4a is connected to the rear end 3a of the brake pedal 3. One of the outlet branches of the rear master cylinder 4 is communicated with a rear brake caliper via a provisioning valve 5 and a rear hydraulic pipe 6.

A front hydraulic pipe 8a is connected to the other branch part, and this hydraulic pipe 8a extends forward along the main frame 9, and an inlet 11a of a metering valve 11 disposed near the steering head pipe IO. It is connected to the. The outlet 11b of the metering valve 11 is branched into two, one of which is connected to the left front brake caliper 12a of the front wheel 2b by a front hydraulic pipe 8b. 8. An air bleed pipe 13 is connected to the other branched portion, and the tofu vibrator 13 extends upwardly through the outside of the main frame 9, and an air bleed valve 14 is attached to its upper end. This air bleed valve 14 is formed by screwing a bleed screw 18 into a bleed seat 17 fixed to the F bleed pipe 13. The bleed screw 18 is formed with a sealing surface 18a that contacts the receiving surface 17a of the bleed seat 17, and further has a discharge passage 18b formed therein. Note that 19 is a rubber camp that closes the upper end of the discharge passage 18b.

Also, the brake lever 1 attached to the right end of the handlebar
A front master cylinder 16 is disposed near 5, and the master cylinder 16 is connected to the front brake caliper 12b on the right side of the front wheel 2b by a hydraulic pipe 8C.

Next, the effects will be explained.

In the hydraulic brake system of this embodiment, when removing air from the piping, first loosen the connection port between the piping 6 and the rear brake caliper 7 for the rear hydraulic piping 6, and supply hydraulic oil in this state. . Then, the air in the rear hydraulic pipe 6 is discharged together with the hydraulic oil from the loosened connection port.

Next, the air in the front hydraulic piping 8a, 8b tends to accumulate in the metering valve 11 located at the highest position, but to remove this air, loosen the air bleed valve 14 and supply hydraulic oil in this state. . Then metering valve 1
1 escapes outward, and the hydraulic oil containing air bubbles is discharged through the discharge passage 18b of the air bleed valve 14, whereby the hydraulic piping 8a
The air inside will escape. In addition, the air remaining in the hydraulic pipe 8b from the metering valve 11 to the left front brake caliper l2a is removed from the air vent valve 1.
4, loosen the connection with the front brake caliper +2a, and supply more hydraulic oil (It), which will cause it to be discharged from the loosened connection port.

In this way, in this embodiment, the rear master cylinder 4,
Attach the air bleed valve 14 to the metering valve 11 disposed at the highest position of the hydraulic piping 8a, 8b that connects the front brake caliper +22, that is, at a position where the air in the piping is likely to float and accumulate. Therefore, the time required for air bleeding work can be significantly reduced.

In addition, in the above embodiment, the air bleed valve 14 was attached to the metering valve ll, but this air bleed valve does not necessarily need to be attached to the metering valve.
The key is to install it at the highest position in the hydraulic piping from the rear master cylinder to the front brake caliper.

〔Effect of the invention〕

As described above, according to the air bleed device for a hydraulic brake system for a motorcycle according to the present invention, the air bleed portion is provided at the top of the hydraulic passage that communicates the rear master cylinder near the brake pedal with the front wheel brake caliper. This has the effect of significantly shortening the time required for air bleeding work.

[Brief explanation of drawings]

FIG. 1 is a side view of an air bleed device for a hydraulic brake system for a motorcycle according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view of the air bleed valve, and FIG. 4 is the above FIG. 5 is a schematic configuration diagram of the embodiment, and is a side view of a motorcycle to which the above embodiment is applied. In the figure, 1 is a motorcycle, 3 is a brake pedal, and 4 is a motorcycle.
is the rear master cylinder, 8a, 8b are hydraulic passages, 14
is an air bleed valve (air bleed part). Patent applicant Yamaha Motor Co., Ltd. Agent
Patent Attorney Tsutomu Figure 3 Figure 4

Claims (1)

[Claims] (1) In a hydraulic brake system for a motorcycle in which a rear master cylinder located near the brake pedal and a front wheel brake caliper are communicated through a hydraulic passage, an air vent is formed at the top of the hydraulic passage. Features: Air bleed device for hydraulic brake systems for motorcycles.