US 5,275,539 A · Internal combustion engine oil pump

Abstract

A lubricant pump for supplying lubricant to an internal combustion engine, the pump comprising a housing defining a pump chamber, an inlet which is adapted to communicate with a source of lubricant and which communicates with the pump chamber, and an outlet which is adapted to communicate with the internal combustion engine and which communicates with the pump chamber, the housing also at least partially defining a fluid chamber, a source of fluid under pressure, a solenoid for selectively and alternatively affording and preventing communication of the fluid chamber with the fluid source, and a pumping member for drawing lubricant into the pump chamber in response to communication of the fluid chamber with the fluid source and for forcing lubricant out of the pump chamber in the absence of communication between the fluid chamber and the fluid source.

Claims20

Dependent claims

A lubricant pump for supplying lubricant to an internal combustion engine, said pump comprising

a housing defining a pump chamber, an inlet which is adapted to communicate with a source of lubricant and which communicates with said pump chamber, and an outlet which is adapted to communicate with the internal combustion engine and which communicates with said pump chamber, said housing also at least partially defining a fluid chamber,
a source of fluid under pressure,
means for selectively and alternatively affording and preventing communication of said fluid chamber with said fluid source, and
pumping means for drawing lubricant into said pump chamber in response to communication of said fluid chamber with said fluid source and for forcing lubricant out of said pump chamber in the absence of communication between said fluid chamber and said fluid source.

1 more element

A lubricant pump comprising a housing defining a first bore having a first axis and defining a second bore having a second axis spaced from and parallel to said first axis, a pumping member supported by said housing for reciprocal movement relative thereto in the direction of said axes, a first piston which is slidably housed in said first bore, which cooperates with said housing to define a first variable-volume pumping cavity, and which is connected to said member for common movement therewith, and a second piston which is slidably housed in said second bore, which cooperates with said housing to define a second variable-volume pumping cavity, and which is connected to said member for common reciprocal movement therewith in the direction of said axes and for limited movement relative to said member in a direction transverse to said second axis.

Dependencies are inferred from the claim text.

Internal combustion engine oil pump

Life of this patent

Internal combustion engine oil pump

Life of this patent

Abstract

Claims20