Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Position responsive
Patent
1997-03-26
1998-07-14
Look, Edward K.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Position responsive
913692, 91376R, F01B 2502, F15B 910
Patent
active
057787549
ABSTRACT:
A valve assembly (10) for controlling a pneumatic brake booster comprises a valve housing (16) with a first and a second valve seat (18, 20) as well as with a valve body (26) adapted to be applied to both valve seats (18, 20). In one position of an operating member (24) the valve body (26) is lifted off the first valve seat (18) only, while in another position of the operating member (24) it is lifted off the second valve seat (20). Radially outside the valve housing (16) an annular third valve seat (64) and a control sleeve (60) surrounding the valve housing are arranged, which as an additional valve body can be axially moved by means of the operating member (24) relative to the valve housing (16). Upon an actuation of the operating member (24) which goes beyond the movement required for lifting the valve body (26) off the second valve seat (20), a venting channel formed by a ring (70) which at least partially surrounds the valve RSLM housing (16) is opened, is arranged on the valve housing (16) at an axial distance from the control sleeve (60) and comprises a hollow space (74) with an inlet (78) connected with an air supply (76) and an outlet (80). A valve assembly (10) of such a design can be manufactured more economically without functional disadvantages.
REFERENCES:
patent: 5056413 (1991-10-01), Kaub
patent: 5161452 (1992-11-01), Horner, Jr. et al.
patent: 5193429 (1993-03-01), Sugiura et al.
Karimi Bijan N.
Look Edward K.
Lucas Industries Public Limited Company
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