Wet oil sump for four cycle engine
AssigneePolaris Industries Inc.
InventorMichael John Bluhm
Life of this patent
Estimating the term…
Abstract
An oil pump assembly is shown for wet oil sump applications at extreme angles for power sports equipment. The oil pump is comprised of a pump body, an oil pick-up and a driven gear shield, where these components may be integrally formed from die cast aluminum. The pump body includes a rotor body housing a gerotor assembly for pumping. The oil pump is attached to the rear wall of the crankcase and below the crankshaft, and is driven by the crankshaft.
Claims25
An engine and pump assembly, comprising a crankcase having a crankcase wall with an opening therethrough, an oil pump body, a pumping member and an oil pump cap, the oil pump body and pumping member being positioned internally of the crankcase wall and the oil pump cap being positioned externally of the crankcase wall, the oil pump body having a sump member extending into an oil reservoir, and a pump case to receive the pumping member.
An oil pump assembly, comprising:
- an oil pump body for insertion within a crankcase, the oil pump body having an integral oil sump member extending into an oil reservoir, and an integral pump case;
- and
- a pumping member receivable in the pump case, and being profiled to pump oil upon rotation thereof, the pumping member comprising a drive gear and drive gear shaft;
- and
- a drive gear shield to which the drive gear is rotatably fixed, and the drive gear partially protrudes though the drive gear shield.
An oil pump assembly, comprising:
- an oil pump housing comprised of an upright housing portion, an oil pickup extending laterally from the upright housing portion and defining an oil pickup volume, a rotor housing, and a gear shield, the rotor housing being fluidly connected to the oil pickup through the upright housing portion;
- a pumping member receivable in the rotor housing, and being profiled to pump oil upon pumping movement thereof;
- a drive gear driving the pumping member;
- and
- a drive gear shield at least partially surrounding the drive gear and preventing the drive gear from being submersed into oil in the oil reservoir,
- wherein the upright housing portion integrally supports the drive gear shield, rotor housing, and gear shield.
A four cycle engine, comprising:
- a crankcase;
- a crankshaft profiled for at least two connecting rods and pistons;
- at least one mid wall separating the crankcase into at least two separate oil sumps;
- one of the oil sumps being larger than the other;
- a conduit connecting the two oil sumps;
- and
- an oil pump receivable in the larger of the oil sumps.
An oil pump assembly, comprising:
- an oil pump body and an oil pump case for insertion within a crankcase;
- an oil sump member for extending into an oil reservoir;
- a pumping member receivable in the pump case, and being profiled to pump oil upon pumping movement thereof;
- a drive gear driving the pumping member;
- and
- a drive gear shield at least partially surrounding the drive gear and preventing the drive gear from being submersed into oil in the oil reservoir, wherein the oil pump body, the oil pump case and the drive gear shield are an integral die cast aluminum member.
Dependencies are inferred from the claim text.