Boosted master cylinder assemblies for vehicle braking system
AssigneeLucas Industries Limited
InventorAlfred Yardley
Life of this patent
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Abstract
A servo booster is provided with a tube coaxial with the booster output rod for relieving the booster housing of braking reaction forces. The housing of a tandem master cylinder has an externally threaded rear end which is threadedly engaged with internal threads formed on a reduced diameter front part of the tube. The retracted position of the primary piston of the master cylinder is determined by abutment with the booster output rod, and this can be adjusted by turning the master cylinder housing relative to the tube.
Claims5
A boosted master cylinder assembly for a vehicle braking system comprising an hydraulic master cylinder assembly and a servo booster assembly;
- said master cylinder assembly comprising a master cylinder housing provided with a bore, a master cylinder piston slidable in said bore, and a recuperation valve responsive to the axial position of said piston in said bore;
- said servo booster assembly comprising a servo booster housing, a movable wall located in said booster housing, an output member engaging with said master cylinder piston, a force transmitting tube which is co-axial with said output member and extends through said movable wall;
- said boosted master cylinder assembly further comprising a threaded connection between said master cylinder housing and said tube, and the retracted position of said master cylinder piston being determined by engagements of said piston with said output member, whereby said retracted position is adjustable by relative rotation of said master cylinder housing and said tube.
A method of adjustment applied to a boosted master cylinder assembly for a vehicle braking system comprising an hydraulic master cylinder assembly and a servo booster assembly;
- said master cylinder assembly comprising a master cylinder housing provided with a bore, a master cylinder piston slidable in said bore, and a recuperation valve responsive to the axial position of said piston in said bore;
- said servo booster assembly comprising a servo booster housing, a movable wall located in said booster housing, an output member engaged with said master cylinder piston, a force transmitting tube which is co-axial with said output member and extends through said movable wall;
- said boosted master cylinder assembly further comprising a threaded connection between said master cylinder housing and said tube, and the retracted position of said master cylinder piston being determined by engagements of said piston with said output member, whereby said retracted position is adjustable by relative rotation of said master cylinder housing and said tube;
- the method comprising the steps of passing fluid through the recuperation valve of the master cylinder, monitoring the fluid flow, turning the master cylinder housing relative to the tube to detect the position at which the valves opens or closes as indicated by a change in the fluid flow, and turning the master cylinder housing relative to the tube from said position by at least a predetermined amount.
Dependencies are inferred from the claim text.