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US 4,377,374 AGranted
Spring actuated piston pump
OwnerFrederick J. Taylorinventor
Life of this patent
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OwnerFrederick J. Taylorinventor
Estimating the term…
A spring actuated piston pump for use in lubricating the bearings of a turbo-charger rotor, both on starting and stopping an associated internal combustion engine. The pump has a piston-and cylinder combination the piston of which is spring-urged towards the cylinder head, and there is a releasable catch arrangement operable on the piston to restrain movement of the piston towards the cylinder head when the piston is part-way between the extremes of its travel. The catch means is solenoid operated for connection to the engine starter system, so that the piston is released when the engine is started. The pump chamber is connected to the engine lubrication system and the turbo-charger bearings through suitable ducts and one-way valves, so that on ordinary operation of the engine the pump chamber is full of oil with the piston fully retracted. On stopping the engine the piston moves under the spring bias discharging oil to the turbo-charger bearings until restrained by the catch arrangement. Subsequently on restarting the engine the piston is released so as to continue its movement under the spring bias again discharging oil to said bearings.
A pump comprising a pump cylinder, a cylinder head mounted on one end of the pump cylinder, a piston slidably mounted within said pump cylinder for movement between a first position adjacent said cylinder head and a second position spaced from said cylinder head, said piston having a piston crown facing said cylinder head thereby defining in conjunction with said pump cylinder and said cylinder head a pump chamber, the cylinder head being provided with two apertures respectively to allow the ingress of liquid to and ejection of liquid from said pump chamber on movement of said piston, there being spring biassing means acting on said piston to urge said piston towards said cylinder head, a piston rod mounted on said piston and extending axially thereof away from said cylinder head, an abutment provided on said piston rod and a catch member movably mounted on said pump cylinder so as to be co-operable with said abutment when said piston is at a third position part-way between said first position and said second position, to restrain movement of the piston towards said first position under the action of said spring biassing means, a solenoid being provided on said pump cylinder to effect movement of said catch member thereby to release said piston when said solenoid is energised.
A pump comprising a pump cylinder, a cylinder head mounted at one end of the pump cylinder, piston means having a piston crown and slidable axially within said pump cylinder, a pump chamber being defined between the crown of the piston and the cylinder head, and the piston means being slidable between a first position whereat said piston crown is adjacent said cylinder head and a second position whereat said piston crown is spaced from said cylinder head, biassing means to urge the piston means towards said first position and releasable catch means operable on said piston means to restrain movement of said piston means under the action of sid biassing means when said piston means is at a third position which said third position is part-way between said first and second positions.
Dependencies are inferred from the claim text.