EP0051965A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Solenoid operated valves
Assignee: Wabco Automotive UK Ltd
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Filing: 1981-10-30
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Granted: —
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Expires: 2001-10-30
Abstract
Abstract An hydraulic control valve and particularly such a valve for use as an automotive brake pressure modulation valve to maintain optimum adhesion and traction between the tyre of the vehicle and the road surface during braking when the wheel shows a tendency to lock. The valve comprises one or more solenoid operated valves (34,40 and 54,60) in which the solenoid (30 or 50) core defines a chamber (34 or 54) for a fluid under pressure. Preferably the valve member (34 or 54) is in the form of a spool connected to or constituting the armature (36 or 56) and is slidable within the core (31 or 52). The core has a narrow waisted portion (at 47) provided to establish a preferred flux part through the armature.
Inventors
- 👤 Michael John Hawker
- 👤 Joseph Mair
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 07:01
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/363; B60T8/3645; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87217
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
An hydraulic control valve comprising a solenoid operated valve- having a solenoid core defining a chamber for fluid under pressure, and a valve member constituting or connected for movement with, the armature of the solenoid which is slidable within the core, wherein a narrow waisted portion is provided in the core so as to establish a preferential flux path through the armature.
Claim 2
Dependent Claim
62 words
An hydraulic control valve comprising a solenoid operated valve- having a solenoid core defining a chamber for fluid under pressure, and a valve member constituting or connected for movement with, the armature of the solenoid which is slidable within the core, wherein a narrow waisted portion is provided in the core so as to establish a preferential flux path through the armature.
Claim 3
Dependent Claim
57 words
A control valve according to claim 1 wherein the solenoid core is formed in one piece and has, in an axially mid position relative to a solenoid coil around the core, an external groove reducing the radial thickness of the core at that point to such an extent that a preferential flux path lies through the armature.
Claim 4
Dependent Claim
18 words
A control valve according to claim 1 or claim 2 wherein the solenoid operated valve is pressure balanced.
Claim 5
Dependent Claim
30 words
A control valve according to any one of claims 1 to 3 wherein the solenoid operated valve is a special valve, the valve spool being integral with the solenoid armature.
Claim 6
Dependent Claim
64 words
A control valve according to claim 4 wherein the valve spool has a flanged end forming the armature and disposed within an enlarged bore in the core,communicating with an inlet for fluid under pressure, wherein the other end of the spool co-operates with a cup-like valve seat element, the interior of which communicates with the said enlarged bore via a bore through the spool.
Claim 7
Dependent Claim
24 words
A control valve according to claim 5 wherein the valve seat is movable to enable alignment of the seat during closing of the valve.
Claim 8
Dependent Claim
50 words
A control valve according to any one of claims 1 to 6 for use as an automotive brake pressure modulation valve and comprising two solenoid operated valves: an inlet valve and an exhaust valve, wherein each of the said valves is independently pressure balanced and operable by independent solenoid means_-
Claim 9
Dependent Claim
69 words
An hydraulic anti-lock braking system comprising a control valve according to claim 7, for controlling the supply of fluid under pressure from a brake valve to the brake actuator at the wheel of a vehicle, the coil of the solenoid being connected to a control unit operable to generate 4 actuating signals in response to data signals produced by sensing means and representative of conditions at the vehicle wheel.
References Cited (Backward Citations)
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