초록 ▼

A pump assembly flows pressurized engine oil to HEUI fuel injectors in a diesel engine. The assembly includes an inlet throttle valve which controls the volume of oil flowed to the pump dependent upon the difference between the pump outlet pressure and a desired outlet pressure determined by an elec

A pump assembly flows pressurized engine oil to HEUI fuel injectors in a diesel engine. The assembly includes an inlet throttle valve which controls the volume of oil flowed to the pump dependent upon the difference between the pump outlet pressure and a desired outlet pressure determined by an electronic control module for the diesel engine. The assembly also includes a crank shaft with an interior drain passage.

대표청구항 ▼

1. A pump assembly including a body; a first chamber in the body; first and second bearings mounted in the body on opposed sides of the first chamber; a rotary shaft including a first journal in said first bearing, a second journal in said second bearing, a drive member located in the first chamber

1. A pump assembly including a body; a first chamber in the body; first and second bearings mounted in the body on opposed sides of the first chamber; a rotary shaft including a first journal in said first bearing, a second journal in said second bearing, a drive member located in the first chamber between the journals, and a rotary input member joining said second journal outwardly of the body for rotating the shaft in the bearings; a first piston bore in the body opening into the first chamber; a piston in said bore, a mechanical drive connection between the piston and the drive member so that rotation of the shaft reciprocates the piston back and forth in the bore along pumping and return strokes for pumping a liquid; a second chamber in the body at the end of the first crank journal away from the first chamber; a shaft seal surrounding the second journal between the first bearing and the input member, the shaft seal including a lip engaging the second journal and facing outwardly from the first chamber; a third chamber surrounding the second journal between the shaft seal and the second bearing; and a passage in the shaft extending from the second chamber past the first chamber to the third chamber, wherein liquid from the first chamber flows past the first bearing into the second chamber, through the passage and into the third chamber, liquid from the first chamber flows past the second bearing into the third chamber, and liquid in the third chamber lifts the seal and flows past the seal.