Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1994-03-30
1995-06-20
Ballato, Josie A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303900, F16K 3106, B60T 1368, B60F 836, B60K 2816
Patent
active
054255759
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION
The invention is based on an electromagnetic valve, disposed in a valve block, for hydraulic brake systems of motor vehicles with an anti-lock and/or traction-control system, as defined hereinafter.
One such valve has already been proposed (German Patent Application P 40 30 963.0, published after the priority date of the present application), in which adjusting the armature stroke can be done only with difficulty, because a throttle disk with a very small throttle bore makes it difficult to use a measuring tool with a scanner pin, which to engage the valve closing member must be introduced through the through bore of the valve body coaxially with the guide tube.
French Patent Disclosure FR-A 2 552 195 discloses a valve of the type referred to at the outset in which the valve body, axially adjustable by threads, engages the guide tube which is open toward the valve block. The valve body has a stepped through bore of relatively large diameter, which discharges into a valve seat. For adjusting the armature stroke, it is possible in a simple way, prior to installation of the valve in the valve block, to pass a scanner pin of a measuring tool through the through bore of the valve body, since the bore cross section is not restricted. After the adjustment operation, the valve body is form-fittingly fixed to the guide tube by a stamping operation.
ADVANTAGES OF THE INVENTION
The valve according to the invention has advantages over the prior art because it permits adjustment of the armature stroke prior to installation of the double-lipped cuff with a throttle insert. The scanner pin of a measuring tool can therefore be introduced into the valve body unhindered from the face end side of the guide tube and brought into contact with the valve closing member through the through bore of the valve body. Once the adjustment of the armature stroke has been concluded and the pole piece has been secured in the guide tube, the valve, supplemented with other components, can be completed in a simple way by insertion of the cuff connected to the annular disk and the throttle insert. The embodiment of the seal as a double-lipped cuff is also especially advantageous, because the outer lip can be used as a check valve.
By the provision recited herein, it is simple to create a component unit, with individual parts fixed in captive fashion, that can be preassembled.
DRAWING
An exemplary embodiment of the invention is shown in simplified form in the drawing and described in detail in the ensuing description.
FIG. 1 is a circuit diagram of a hydraulic brake system with electromagnetic valves, and
FIG. 2 is a longitudinal section through such a valve, on a different scale .
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
A hydraulic brake system 10 for motor vehicles, shown in FIG. 1, has a pedal-actuatable master cylinder 11 with a pressure fluid tank 12. A first brake circuit I of the brake system 10 is associated with wheel brakes 13, 14 of nondriven vehicle wheels, for instance the front axle of the vehicle. The wheel brakes 15, 16 of driven vehicle wheels, for instance of the rear axle of the vehicle, are connected to a second brake circuit II. The brake system 10 accordingly has what is known as TT-style brake circuit distribution. Brake circuit I will be described in detail below:
Brake circuit I has a first brake line 19 beginning at the master cylinder 11 and leading to the wheel brake 13. Branching off from this brake line 19 is a second brake line 20 to the second wheel brake 14 of this brake circuit I. Each of the wheel brakes 13, 14 is assigned a valve assembly 21 and 22, respectively, for brake pressure modulation. Each of the valve assemblies 21, 22 have an inlet valve 23 disposed in the corresponding brake line 19, 20. This valve is embodied as a 2/2-way valve with a spring-actuated open position 23a and an electromagnetically switchable blocking position 23b. Each inlet valve 23 is bypassed by a bypass line 24 in which there is a check valve 25. The applicable check valve 25 has an admission d
REFERENCES:
patent: 4790351 (1988-12-01), Kervagoret
patent: 5167442 (1992-12-01), Alaze et al.
patent: 5244261 (1993-09-01), Ohe
patent: 5267785 (1993-12-01), Maisch
patent: 5335984 (1994-08-01), Alaze et al.
Alaze Norbert
Baumann Dietmar
Herzog Kurt
Megerle Friedrich
Muller Klaus
Ballato Josie A.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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