Patent EP0238388A2 successfully refreshed from Google Patents.
EP0238388A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Bi-fluidic brake actuator for a vehicle braking circuit
Assignee: Bendix Italia SpA
•
Filing: 1987-03-05
•
Granted: —
•
Expires: 2007-03-05
Abstract
Abstract A bi-fluidic brake actuator for a vehicle brake circuit comprising a closed shell (36) divided into first and second booster chambers (38, 40) by a flexible diaphragm (42), one chamber (40) being intended to be connected, in use, to a low pressure fluid, the two chambers (38, 40) being interconnectable by way of a passage (54) which may be selectively closed by a first valve means (62, 72), the other chamber (38) being selectively connectable by a second valve means (72, 76) to a source of high pressure fluid, the flexible diaphragm being connected to a valve (18) intended to control the flow of a second fluid therethrough. The actuator further includes an electromagnetic actuator (32) adapted to operate the first and second valve means (62, 72, 74) in response to a given electrical signal.
Inventors
- 👤 Leonardo Cadeddu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 16:00
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4241; B60T8/425
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
1/ A bi-fluidic brake actuator for a vehicle brake circuit comprising a closed shell (36) divided into first and second booster chambers (38,40) by a flexible diaphragm (42), one chamber (40) being intended to be connected, in use, to a low pressure fluid, the two chambers (38,40) being interconnectable by way of a passage (54) which may be selectively closed by a first valve means (62,72), the other chamber (38) being selectively connectable by a second valve means (72,76) to a source of high pressure fluid, the flexible diaphragm being connected to a valve (18) intended to control the flow of a second fluid therethrough, characterised in that the actuator further includes an electromagnetic actuator (32) adapted to operate the first and second valve means (62,72,74) in response to a given electrical signal.
Claim 2
Dependent Claim
133 words
1/ A bi-fluidic brake actuator for a vehicle brake circuit comprising a closed shell (36) divided into first and second booster chambers (38,40) by a flexible diaphragm (42), one chamber (40) being intended to be connected, in use, to a low pressure fluid, the two chambers (38,40) being interconnectable by way of a passage (54) which may be selectively closed by a first valve means (62,72), the other chamber (38) being selectively connectable by a second valve means (72,76) to a source of high pressure fluid, the flexible diaphragm being connected to a valve (18) intended to control the flow of a second fluid therethrough, characterised in that the actuator further includes an electromagnetic actuator (32) adapted to operate the first and second valve means (62,72,74) in response to a given electrical signal.
Claim 3
Dependent Claim
32 words
2/ Actuator as claimed in claim 1 characterised in that the first and second valve means (62,72,74) comprise a common valve member (72) and are sequentially operated by the electromagnetic actuator (32).
Claim 4
Dependent Claim
64 words
3/ Actuator as claimed in claim 1 or 2 characterised in that the valve (18) is a spool valve comprising a spool member (84) displaceable in a bore (82) by the flexible diaphragm (42) between a first position allowing the passage of fluid through the valve (18) from an input (14) to an output (16) and a second position interrupting the passage of fluid.
Claim 5
Dependent Claim
35 words
4/ Actuator as claimed in claim 3 characterised in that the movement of the spool member (84) from its first to its second position is adapted to decrease the fluid pressure at the output (16).
Claim 6
Dependent Claim
32 words
5/ Actuator as claimed in any preceding claim characterised in that it comprises a one-way check valve (96) arranged to allow passage of fluid from the output (16) to the input (14).
Claim 7
Dependent Claim
35 words
6/ Actuator as claimed in any preceding claim in which the low pressure fluid source is a vacuum source, the high pressure fluid source is atmospheric air, and the second fluid is a hydraulic fluid.
Claim 8
Dependent Claim
86 words
7/ An anti-skid braking system for a vehicle comprising a bi-fluidic actuator as claimed in any one of claims 1 to 6 the input (14) of which is connected to a vehicle master cylinder (10) and the output of which is connected to a vehicle wheel brake (20), the system further comprising sensing means (22,26) for determining the speed of rotation of the wheel, electronic processor and actuator means (28,30) adapted to activate the electromagnetic actuator (32) in response to the locking of the vehicle wheel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.