Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1996-05-02
1998-10-20
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
417549, 417273, F04B 2102, B60T 832
Patent
active
058236392
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a piston pump for delivering hydraulic fluid, particularly in a block-protected vehicle braking system.
BACKGROUND OF THE INVENTION
When using such a pump in a block-protected braking system (ABS) and/or an anti-slip control (ASC) system of a vehicle, its purpose is to supply hydraulic brake fluid to the master cylinder and/or the vehicle wheel brakes, in order to achieve a braking action within the ABS or ASC control cycles in a known manner.
In such piston pumps according to the state of the art, the intake and outlet valves are generally arranged in the longitudinal axis of the pump. These pumps are referred to as radial piston pumps. A piston performs working strokes along the longitudinal axis of such a pump in order to supply the hydraulic fluid towards the brake of the vehicle. In accordance with the state of the art, the piston is accommodated in a sliding sleeve which is securely connected with the pump housing, and the intake and outlet valves are usually arranged on the longitudinal axis of the pump. This state of the art is known from DE-A-32 36 536, DE-A-37 42 824 and DE-A-40 27 794.
SUMMARY OF THE INVENTION
In the case of this state of the art, the piston, the intake valve and a return spring for the piston must each first be installed in a sliding sleeve which keeps the components together. The sliding sleeve with said installed parts can then be inserted as a sub-assembly into the housing of the valve. Such a design of the piston pump is intricate with respect to the number of components and their assembly.
The invention is based on the object of further developing a piston pump of the initially mentioned type in such a manner that the effort required for manufacturing and assembly is reduced.
According to the invention, this object is solved in that certain parts of the piston pump are designed in such a way that they can be connected with each other prior to assembly in the pump in such a manner that they form an assembly which is capable of being handled independently. In order to form this assembly, the piston as well as individual parts of the valve are preferably taken into consideration. The return spring which biases the piston towards a drive unit can also be added to the assembly which is connected with the piston prior to installation in the pump by means of a positive connection.
The invention also makes it possible to reduce the manufacturing and assembly effort for a piston pump in that the sliding sleeve which is used in the state of the art is omitted and instead of which the piston and the valve assembly are capable of being installed directly in the pump housing. The "direct" installation of said parts in the pump housing means that no special sliding sleeve is arranged between the piston and the valve assembly and the housing which encloses these parts. This inventive solution of said object does not necessarily imply that the piston, the return spring and the valve assembly have been connected to form an independently handable assembly prior to installation in the piston pump.
It is preferably intended to have the assembly (consisting of at least the piston, the valve assembly and the return spring, if required) connected by means of a part of the valve assembly.
The component which permits the connection of the assembly is preferably a shaped sheet metal part of the valve assembly.
The inventive handling of the components piston, intake valve and return spring as an independent subassembly of the piston pump is advantageous in that an easy and primarily position-independent assembly is possible, because this subassembly can be inserted directly into the pump body (housing) without prior installation in a sliding sleeve and without a certain positioning of the housing.
The connection of said components to one another is preferably effected by means of positive connections and elastic engagement of the parts into each other.
The design of the component which connects said parts as a shaped sheet metal part is advantag
REFERENCES:
patent: 2521164 (1950-09-01), Hayes
patent: 4113323 (1978-09-01), Haney
patent: 4730879 (1988-03-01), Adachi et al.
patent: 5213482 (1993-05-01), Reinartz et al.
patent: 5232273 (1993-08-01), Eckstein et al.
patent: 5505530 (1996-04-01), Kramer et al.
Gegalski Helmut
Zinnkann Ulrich
Graham Matthew C.
Lucas Industries Public Limited Company
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