Oil pump

An improved modular oil pump for use in combination with a HARLEY DAVIDSON Twin Cam 88 engine, having a drive shaft providing rotational power, an engine sump and a cam sump for collecting lubricating fluid, a fluid reservoir for storing oil for lubrication, an endplate having fluid passages therein, and an oil supply conduit for communicating oil from said reservoir to engine parts, comprising:

• a first gerotor pump, said first gerotor pump having an intake port engageable in communication with said engine sump and said cam sump and having a discharge port engageable in sealed communication with a fluid reservoir;
• a second gerotor pump, said second gerotor pump having an intake port engageable in sealed communication with said fluid reservoir and a discharge port engageable in sealed communication with said oil supply conduit;
• said first pump having a first housing and an inner gear engaged with an outer gear inside a first cavity, said inner gear having a mounting aperture therein with a center axis communicating axially therethrough;
• said second pump having a second housing with an interior gear engaged with an exterior gear inside a second cavity, said interior gear having a mounting passage therein with a center axis communicating axially therethrough;
• and
• said first pump attachable to said second pump to form a pump unit which can be readily disassembled by detaching said first and second housings with said center axis of said inner gear in line with said center axis of said interior gear, wherein said pump unit is engageable with said engine in a position sandwiched between said engine and said endplate, with said drive shaft cooperatively engaged with said inner gear and said interior gear to provide rotational power thereto.

An improved modular oil pump for use in combination with a HARLEY DAVIDSON Twin Cam 88 engine, having a drive shaft providing rotational power, an engine sump and a cam sump for collecting lubricating fluid, a fluid reservoir for storing oil for lubrication, an endplate having fluid passages therein, and an oil supply conduit for communicating oil from said reservoir to engine parts, comprising:

• a first gerotor pump, said first gerotor pump having an a first intake port engageable in communication with said engine sump and a second intake port engageable in communication with said cam sump and having an discharge port engageable in sealed communication through conduits in an endplate, with a fluid reservoir;
• a second gerotor pump, said second gerotor pump having an intake port engageable in sealed communication through intake conduits in said endplate, with said fluid reservoir and a discharge port engageable in sealed communication through discharge conduits in said endplate, with said oil supply conduit;
• said first pump having a first housing and an inner gear engaged with an outer gear inside a first cavity, said inner gear having amounting aperture therein with a center axis communicating axially therethrough;
• said second pump having a second housing with an interior gear engaged with an exterior gear inside a second cavity, said interior gear having a mounting passage therein with a center axis communicating axially therethrough;
• and
• said first pump attachable to said second pump to form a pump unit which can be readily disassembled by detaching said first and second housings with said center axis of said inner gear in line with said center axis of said interior gear, wherein said pump unit is engageable with said engine in a position sandwiched between said engine and said endplate, with said drive shaft cooperatively engaged with said inner gear and said interior gear to provide rotational power thereto.