Valve unit with valves located opposite one another

Details Valve unit with valves located opposite one another Valve unit with valves located opposite one another

1995-02-28

1996-12-10

Graham, Matthew G.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

13759617, F16B 1308, B60T 836

Patent

active

055824692

DESCRIPTION:

BRIEF SUMMARY
STATE OF THE ART

The invention proceeds from a conventional valve unit with a pair of coaxial valves located opposite one another in relation to a reference plane in which a pressure-medium channel extends. A valve unit of this type is described in U.S. Pat. No. 4,612,845. The known valve unit possesses a block-like stationary valve element serving at the same time as a valve housing and having an axially continuous middle bore, to which the pressure-medium channel is connected in the form of a transverse bore leading to the outside of the valve element or of the valve housing. Further transverse bores serve for connecting a pump and a consumer and, in conjunction with an axial bore, for making a pressure-medium connection to regions of the middle bore which are provided axially at a distance from one another.
In the known valve unit, movable valve bodies actuable by controllable drive devices and belonging to two coaxially arranged valves cooperate with the stationary block-like or housing-like valve element, the movable valve bodies having portions of larger and smaller diameter located in succession in the axial direction, thereby providing control edges and control faces for the opening and closing of pressure-medium connections. The drive devices designed as electromagnetic drive devices and intended for the movable valve bodies are mounted on the outside of the stationary valve element.
An important advantage of the known valve unit according to the abovementioned U.S. Pat. No. 4,612,845 is that a double valve having two separately controllable individual valves can acquire a highly compact design as a result of the use of a common stationary valve element which serves at the same time as a valve housing. Where particularly small valves are concerned, however, it occasionally proves difficult to make the various bores, annular grooves and connecting channels cost-effectively and with the necessary accuracy in the block-like valve element.
Furthermore, U.S. Pat. No. 4,690,465 discloses a comparatively compact, piezoelectrically actuated valve unit with a plurality of pairs of coaxial valves which are located opposite one another in relation to a reference plane and in which the movable valve bodies are spherical valve bodies which are under spring pretension and each of which cooperates with a conical or tapered valve seat as a stationary valve element. At the same time, the valve seats are provided in plate-like elements of a valve housing constructed from a plurality of individual parts screwed together with one another. The division of the housing into a plurality of individual elements allows a relatively simple and accurate machining of the individual valve seats, but entails altogether increased production costs, since the individual elements of the valve housing have to be adjusted accurately relative to one another, in order to orient the individual portions of continuous pressure-medium channels in alignment with one another and in relation to the valve seats.


SET OBJECT

Proceeding from the state of the art discussed above, particularly according to U.S. Pat. No. 4,612,845, the object on which the present invention is based is to specify an improved valve unit which can be produced in a space-saving and cost-effective way particularly in the form of a hydraulic ABS valve unit with two pairs of coaxial valves located opposite one another, namely one pair of inlet valves and one pair of outlet valves.


ADVANTAGES OF THE INVENTION

The set object is achieved by means of a valve unit according to the invention having an advantage that a cost-effective and accurate fabrication of the valve seat becomes possible as a result of the separate production of the stationary valve element common to both valves.
A further important advantage of the valve unit according to the invention is that the correct spacing between the valve seats can be provided as early as during the production of the stationary valve element, so that no further adjustment work is necessary in this respect for the two valves o

REFERENCES:
patent: 1690251 (1928-11-01), Schlesinger et al.
patent: 3921666 (1975-11-01), Leiber
patent: 4568131 (1986-02-01), Blomberg et al.
patent: 5402824 (1995-04-01), Hosoya et al.

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