Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1996-06-18
1998-03-10
Poon, Peter M.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
417269, 417415, 417521, B60T 840
Patent
active
057252874
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to hydraulic brakes and more particularly relates to hydraulic brake systems which use a motorized pump to control various modes of vehicle braking.
BACKGROUND OF THE INVENTION
Such brake installations are generally known from DE 39 06 141 A1. In this known hydraulic brake installation with antilock regulating arrangement there is provided a controllable hydraulic pump connected with the wheel braking cylinder, which pump in inactive antilocking regulation takes over the function of braking force reinforcement and in active antilocking regulation takes over the function of a pressure modulator. The controllable hydraulic pump engageable on a brake pedal actuation is a wing cell pump controllable not only with respect to its conveying performance but also with respect to its conveying direction. The pump is interposed in each case into the brake line leading from the main cylinder to the wheel brakes, its conveying direction being adjustable by means of a hydraulically adjustable lift ring. During normal brake actuation the pump directs hydraulic pressure toward the wheelbrake. During antilocking regulation the pump directs hydraulic pressure toward the main cylinder. Since in a locking-protected brake installation not all the wheel brakes can be regulated in common, but individually or in pairs according to the type of the brake installation, several such pump arrangement are required.
The problem overcome by the present invention is the problem of creating a brake installation of the above-described type with an especially economical and space-saving arrangement of several such adjustable wing cell pumps.
This problem is solved by using wing-cell pumps and adjusting their conveying direction and also their conveying performance (power) at a constant turning rate by means of a common motor. The conveyance of each individual wing-cell pump can be individually adjusted without influencing the output power of the other pump.
So that the conveying performance of each individual wing-cell pump will be independent from the other wing-cell pump, the turning rate of the electric motor stabilized.
By using modular construction techniques, this arrangement can be used also in different brake installations with different number of regulated circuits.
Since at least one wing-cell pump is always driven by the motor, this first wing-cell pump can also be rigidly fastened to the motor.
A stageless adjustment of the individual lift rings improves the regulating quality. There, proportional magnets are preferred and present an especially simple solution.
By an elastic pre-tensioning of the lift rings, it is not necessary that an electromagnetic setting force be constantly exerted on the lift ring, in which expediently the conveying direction established by the elastic pre-tensioning points in the direction toward the wheel brakes, since this conveying direction is used in the more frequent cases of the pump actuation.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a pneumatically indicated hydraulic switching plan of a brake installation according to the invention.
FIG. 2 is a pump arrangement for a brake installation according to the invention.
FIG. 3 is an individual wing-cell pump of the arrangement according to FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1, only the hydraulic circuit is indicated, not the spatial arrangement (i.e. the position of the individual wing-cell pumps does not correspond to the actual arrangement).
In the brake installation represented in FIG. 1, a two-circuit brake installation with diagonal braking circuit subdivision is depicted. Since brake circuits I and II are identically constructed, the following description of brake circuit I holds correspondingly also for brake circuit II.
With brake pedal 3 unactuated, the main cylinder 1 is connected with the pressure medium container 2. Pressure chambers are connected to brake circuits I and II. Into the brake line 4 there is inserted in each case a pressure limiting valv
REFERENCES:
patent: 3180271 (1965-04-01), Hartmann
patent: 4496288 (1985-01-01), Nakamura et al.
Feigel Hans-Jorg
Klein Andreas
Neumann Ulrich
Schiel Lothar
ITT Automotive Europe GmbH
Lewis J. Gordon
Poon Peter M.
Twomey Thomas N.
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