Electrohydraulic pressure adjuster for a slip-controlled vehicle

Details Electrohydraulic pressure adjuster for a slip-controlled vehicle Electrohydraulic pressure adjuster for a slip-controlled vehicle

1996-10-15

1998-06-09

Lee, Kevin

Valves and valve actuation

Electrically actuated valve

Including solenoid

3031192, F16K 3102, B60T 832

Patent

active

057623180

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on an electrohydraulic pressure adjuster as generically defined hereinafter.
From international patent disclosure WO-A 92/08630, which defines this generic type, an electrohydraulic pressure adjuster is known which has a cap with a bottom to which a flexible circuit board is secured, while coils for electromagnetically actuatable valves are disposed underneath the bottom. The coils have electrical contact elements in the form of straight connection wires, each extending parallel to the longitudinal axis of the coils and reaching through a respective opening in the bottom. There, the connection wires are joined by a material bond to flexible prongs of the circuit board. A rubber-elastic sealing stopper is also received in prestressed fashion in each opening of the bottom. With frictional engagement, the stopper envelops both the respective connection wire over a portion of its length and a tang, on the side toward the coil, from which the connection wire extends. Since the flexible prongs can support the coils to only a limited extent, the task of mounting of the coils is substantially taken on by the sealing stopper and to a small extent by the connection wires. The sealing stoppers restrict the elasticity of the mounting of the coils both axially and radially, however.
From published German patent application DE 41 00 967 Al, a pressure adjuster is also known, in which the coils of magnet valves are suspended elastically resiliently from a hoodlike cap, so that they can be aligned relative to a valve block when they are joined to the valve block. To that end, elastic mounts are provided that extend from a support element of the cap and engage the coils. They allow radial and axial yielding of the coils. Moreover, the coils are joined by electrical contact elements to an electronic controller received in the cap. These contact elements must also be embodied resiliently, so that they can follow along with the alignment motion of the coils. The electrical contact elements may be disposed inside the elastic mounts. The expense for the elastic mounting of the coils and contacting them resiliently to the controller is therefore relatively high.


ADVANTAGES OF THE INVENTION

The pressure adjuster according to the invention has the advantage over the prior art that the electrical contact elements, especially of the cap, that also serve to retain the coil furnish increased elastic resilience crosswise to the longitudinal axis of the coil, or in other words in the direction in which the coil must deflect if there is an axial offset when the coil is mounted on the valve dome. Thus, the coil can be well aligned relative to the valve dome, and the attendant strains do not cause breakage or separation of the integral elements, which nevertheless are able to support the weight of the coil.
By means of the provisions recited herein, advantageous further features of and improvements to the pressure adjuster are possible.
The embodiment of the invention as defined herein has the advantage that an intimate connection between the wire and the fastening lug is attained, despite a reduced positional precision.
Expedient shapings for the connection wires are also set forth.
The embodiment of the invention as recited herein facilitates making the connection and monitoring the connection visually.
With further provisions, a high axial positional precision of the coil is advantageously attained, so that the coil alignment relative to the valve dome is effected substantially only in the radial direction. This keeps the strain on the integral elements slight. The embodiments recited herein define advantageous provisions for a low-strain embodiment of the integral elements.


BRIEF DESCRIPTION OF THE DRAWINGS

Two exemplary embodiments of the invention are shown in simplified form in the drawing and described in further detail in the ensuing description.
FIG. 1 is a view of a pressure adjuster when a cap, shown in cross section, with coils is joined to a valve block shown below the cap;
FIG. 2 shows

REFERENCES:
patent: 5040853 (1991-08-01), Burgdorf et al.
patent: 5275478 (1994-01-01), Schmitt et al.
patent: 5407260 (1995-04-01), Isshiki et al.
patent: 5449226 (1995-09-01), Fujita et al.
patent: 5466055 (1995-11-01), Schmitt et al.

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