Fluid-pressure and analogous brake systems – With pump
Patent
1981-05-12
1984-06-26
Butler, Douglas C.
Fluid-pressure and analogous brake systems
With pump
188181A, 303116, 303119, B60T 802, B60T 1300
Patent
active
044563094
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
The invention of this application is disclosed in corresponding International Application No. PCT/GB80/00144, filed Sept. 18, 1980, the benefit of which is being claimed.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an hydraulic wheel slide protection system for a vehicle, the system being of the general kind in which pressure fluid is supplied to a wheel brake under the control of a modulator valve, and sensing means is arranged to sense an incipient wheel slide condition of the braked wheel during running of the vehicle, the valve being operative, in response to a signal from the sensing means, to modify the braking force applied to the wheel in order to correct the slide condition.
2. Description of the Prior Art
Some conventional wheel slide protection systems employ a wheel driven pump operating in conjunction with the modulator valve and, for practical reasons, it is advantageous to install the valve close to, or even as a unit with, the pump. This places the pump in a location close to the wheel where only limited space is available and which is also unsatisfactory in that it provides a dirty operating environment.
In other conventional wheel slide protection systems, the pump is driven from the vehicle engine or transmission, or by a separate motor, and this arrangement indicates the placing of the pump in the engine compartment, where equipment is housed in cramped conditions, or elsewhere on the vehicle frame remote from the wheels. In order to minimise and simplify the runs of hydraulic conduit, it is desirable to place the modulator valve near to the pump, thereby adding to the problem of available space.
BRIEF SUMMARY OF THE INVENTION
According to one aspect of the present invention, the modulator valve of the wheel slide protection system is supplied with fluid by means of a pump incorporated in an axle assembly adapted to carry the wheel to be braked, the pump being located adjacent to the wheel and adapted to be driven therefrom as a function of the speed of that wheel only.
In one convenient arrangement of the system, a fluid reservoir is additionally incorporated in the axle assembly, as is, preferably, the modulator valve.
According to another aspect of the present invention, the modulator valve of the wheel slide protection system is incorporated in an axle assembly adapted to carry the wheel to be braked, the modulator valve being located adjacent to the wheel to be braked and operating to control the braking of that wheel only.
Preferably the working fluid is supplied to the modulator valve by means of a pump which may conveniently also be incorporated in the axle assembly. It may further be convenient to incorporate a fluid reservoir of the system in the axle assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described, by way of example, with reference to the accompanying drawings in which:
FIG. 1 is a diagrammatic representation of a braking system incorporating one form of the wheel slide protection system of the invention;
FIG. 2 is an elevational view, partly in cross-section, of part of a wheel and brake assembly and the associated parts of one practical form of the wheel slide protection system of the invention, and
FIGS. 3 and 4 are respectively views similar to FIG. 2 of two embodiments of the braking system of the invention incorporated in a motor cycle axle assembly.
DETAILED DESCRIPTION
The braking system shown in FIG. 1 of the drawings includes a conventional master cylinder 1 having a reservoir 2 and arranged to be actuated via a vacuum-assisted device 3 by means of a driver-operated pedal 4, the master cylinder being arranged to supply a brake 5 under the control of an electrical solenoid valve 6, operation of which is governed by an electrical control unit 7. The control unit receives an input from a wheel speed detector, indicated generally at 8, which includes a wheel speed sensor 9, normally an inductive device, and a co-operative toothed rotor 10 rotatable wit
REFERENCES:
patent: 2818244 (1957-12-01), Ropar
patent: 3667816 (1972-06-01), Harned
patent: 3731767 (1973-05-01), Lefort
patent: 3829166 (1974-08-01), Menar
patent: 4036331 (1977-07-01), Hayashi et al.
Butler Douglas C.
Lucas Industries Limited
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