Valve arrangement

Details Valve arrangement Valve arrangement

1996-03-25

1998-05-19

Young, Lee W.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

3031131, B60T 836

Patent

active

057527504

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a valve arrangement, particularly for a fluid brake circuit with anti-slip control, comprising a first, a second and a third fluid connection of respective, predetermined flow cross-sections, at least one valve element which is biased by a first spring arrangement in a first position in which the first and second fluid connection are communicating via a flow path and the third fluid connection is closed, and a valve actuating means by which the valve element can be moved in order to assume a second position in which the first and third fluid connection are communicating via a flow path and the second fluid connection is closed.
EP-0492109 A1 describes a non-return valve with a consumer-side valve seat and a pressure generator-side closing element which through magnetic force effect is capable of acting upon an armature at the valve seat. A compression spring is arranged between the armature and the closing element. In the closed valve position, this imparts a closing force on the closing element, which is adapted to the response pressure. In this manner, a non-return valve and a pressure limiting valve are implemented in one valve unit. From DE-3832023 it is known to provide differently biased non-return valves as safety valves counter parallel to an ASC switching solenoid valve. These non-return valves are, however, formed as separate assemblies.
From DE-4112136 A1, a unit comprising a pressure limiting valve and a switching valve for a hydraulic braking system with a locking protection and a traction control means is known. The unit comprises a guide tube formed from a housing jacket with a solenoid accommodated therein for an armature which is accommodated therein in a longitudinally movable manner. The guide tube is closed at both ends by respective yoke members. The first yoke member comprises a first connection of the switching valve. This eccentrically arranged connection communicates with the inner space of the guide tube. The first yoke member additionally comprises the third connection of the switching valve, which extends coaxially to the longitudinal axis of the guide tube. This third connection terminates in a first valve seat. The second yoke member is provided with the centrally arranged second connection of the switching valve. This second connection communicates internally with a second valve seat.
The armature of the switching valve has a tubular shape and comprises an internal collar at the side of the second yoke member. A reset spring which is formed as a helical compression spring bears against this internal collar and acts upon the second yoke member. The armature accommodates two disks which are permeable to a pressure medium and between which a spring which is formed as a helical compression spring is arranged coaxially with the longitudinal axis. The spring is subjected to a biasing force due to which the first disk bears against a stop ring inserted in the armature and the seconds disk bears against the internal collar. On the side of the first yoke member a ball serving as a first closing member is attached to the first disk. The first closing member in cooperation with the valve seat of the first yoke member forms a first seat valve of the switching valve. At the second disk of the armature a similar ball serving as a second closing member is arranged on the side of the second yoke member. In cooperation with the valve seat of the second yoke member, the closing member forms a seat valve both of the switching valve as well as the pressure limiting valve.
This arrangement comprises a relatively great number of parts, and its manufacture is complicated.
Consequently, it is the object of the invention to design a valve arrangement, particularly for a fluid brake circuit with anti-slip control, which is simpler and comprises fewer components.
In addition, this valve arrangement is intended to limit the pressure generated by a pump for braking at least one spinning vehicle wheel in the case of an activated anti-slip control with the aid of simple mea

REFERENCES:
patent: 4526203 (1985-07-01), Leiber
patent: 4596273 (1986-06-01), Kiyoshima
patent: 5218996 (1993-06-01), Schmitt-Matzon
patent: 5332304 (1994-07-01), Maas

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