JPS58121331A - Brake for car - Google Patents

Abstract

PURPOSE:To prevent the generation of dust generated from a frictional material at braking while obviating diffusion of the dust into atmospheric air of dust by constituting the frictional material while using vegetable cellulose as a base material and constituting a brake chamber in an airtight manner. CONSTITUTION:The opening section of the side surface of a hub 7 covered with a brake plate 11, the inside is formed in the brake chamber 14 maintained in airtight form by a seal ring 13, and a small amount of lubricating oil is encased. A multi-plate clutch 15 is connected to a support bolt 16 screwed to the inner surface of the brake plate 11, and consists of several holding pressing plates 19 arranged between a push plate 17 and a pressure receiving plate 18 and several friction plates 21 disposed among the holding pressing plates 19. A shaft member 22 suppports the friction plates 21, and is fixed onto the inner surface of the hub 7 by a bolt 23. One side of a piston 27 in a cylinder 26 faces to a hydraulic chamber 28, and the other side is opposed to the push plate 17.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to improvements in brakes used for vehicles, particularly automobiles and motorcycles, and prevents dust generated by scraping from the surface of friction materials during braking from being dissipated into the atmosphere. The purpose is to

Conventional vehicle brakes mainly include drum brakes and disc brakes, both of which use asbestos as a base material and press a friction material solidified with resin onto an iron drum or disc that rotates with the wheels to achieve braking. During braking, the friction material peels off little by little and becomes dust, which is dispersed into the atmosphere. According to recent research, asbestos dust is said to be carcinogenic, so it is preferable to reduce the generation and release of asbestos-based dust into the atmosphere as much as possible.

This invention has been made based on the above viewpoint, and is characterized in that the friction material is constructed using vegetable cellulose as a base material instead of the conventional friction material using asbestos as a base material.

The present invention will be explained in detail below. In the figure, 1 is a front fork of a motorcycle, and a front wheel 3 is supported at its lower end via a center shaft 2. The front wheel 3 consists of a rim 5 on which a tire 4 is fitted, a hub 7 supported on the axle 2 via two bearings 6, 6, and spokes 8 connecting the rim 5 and the hub 7. There is. 9, 9 is a spacer. 11
A brake plate is supported by the axle 2 via a spacer lla, and is locked to the front fork 1 by a protrusion 12 to prevent rotation. The side opening of the hub 7 is covered with a brake plate 11, and the inside thereof forms a brake chamber 14 which is kept watertight by a seal ring 13 and contains a small amount of lubricating oil. Reference numeral 15 denotes a multi-disc clutch, which includes several pressure plates 19 that are engaged with support bolts 16 screwed onto the inner surface of the brake plate 11 and arranged between a pressure plate 17 and a pressure receiving plate 18; Several friction plates 2 arranged between 19
It consists of 1. Reference numeral 22 denotes a shaft member supporting the friction plate 21, which is fixed to the inner surface of the hub 7 by bolts 23, and the inner circumference of the friction plate 21 is fixedly fixed only in rotation by a spline 24 provided on the outer circumference.

25 are three hydraulic pressures arranged equally on the brake plate 11 □
The actuating means consists of a cylinder 26 and a piston 27 fitted into the cylinder, with one side of the piston 27 facing the hydraulic chamber 28 and the other side facing the press plate 17.

Reference numeral 29 denotes an oil passage for connecting the inside of the hydraulic chamber 28 to a master cylinder operated by a brake operator (not shown), such as a brake lever.

By the way, at least one of the pressure plate 19 and the friction plate 21 is made of a friction material (hereinafter referred to as paper lining) made of vegetable cellulose as a base material and solidified with resin. Only one of them is replaced by steel plate. Paper linings generally have inferior abrasion resistance compared to conventional friction materials made mainly of asbestos, so in order to not reduce durability, they are designed to be wet-type and increase the friction area to reduce surface pressure during braking. It is preferable.

Next, the operation of this embodiment will be explained. When the brake is operated while the vehicle is running and the inside of the hydraulic chamber 28 is pressurized, the piston 2
7 moves to the left in the figure to move the pressing plate 17 to the left in the figure. At this time, since the position of the pressure receiving plate 18 is fixed, there is no gap between the pressure plates 19, and the rotation of the friction plate 21 is restrained by the pressure plates 19. When the zero braking operation that applies braking to the vehicle is released, the piston 27 retreats to the right and a gap is created between the pressing plate 17 and the pressure receiving plate 19, allowing the friction plate 21 to rotate and causing no movement of the vehicle. You will be able to travel without being stopped.

As described above, in this invention, a vehicle brake is constructed with a multi-disc clutch, and the friction material forming the friction surface is a paper lining. Therefore, there are no problems such as carcinogenicity.

In addition, since the brake itself is a multi-disc clutch, the surface pressure is small, and even if the paper lining itself has somewhat poor wear resistance, there is no decrease in durability.

Furthermore, by sealing the brake chamber and putting lubricating oil inside, not only will the durability of the paper lining itself increase, but the fine particles generated from the friction surfaces will be absorbed by the lubricating oil and will not be released directly into the atmosphere. Since it can be taken out from the brake chamber along with the lubricating oil without causing any damage, its recovery is easy.

[Brief explanation of drawings]

The drawings show an example of the embodiment of the present invention, and FIG. 1 is a side view of a front wheel brake of a motorcycle, and FIG. 2 is a sectional view of the main part corresponding to the section taken along the line 1--2. 7. Hub, 11. Brake plate. 14...Brake chamber, 17...Press plate. 18...Pressure plate, 19...Press plate, -2111@Friction plate Patent applicant Ito Kogyo Co., Ltd. Procedural amendment (voluntary) 10 1980 Yoriki 2r Japan Patent Office Commissioner Kazuo Wakasugi 1, Incident Indication: 1982 Patent ■ No. OO Oo and No. 2, Name of the invention Vehicle brake 3, Relationship to the case of the person making the amendment Patent applicant address 201-14 Hatsei-cho, Hamamatsu City, Shizuoka Prefecture 433, Subject of the amendment Figure 2 of the drawings. 5. Details of the amendment as shown in the attached sheet.

Claims (1)

[Claims] 1) An annular brake chamber is formed on the inner surface of the hep by a knob rotatably supported on the axle and a brake plate non-rotatably supported, and the brake A multi-disc clutch connected to the hub and the brake plate and engaged and operated by a brake operator is provided in the room, and the friction member forming the friction surface of the multi-disc clutch is lined with paper based on vegetable cellulose. brakes for vehicles. 2) The vehicle brake according to item 1, wherein the brake chamber is watertight and contains lubricating oil.