ISUZU 6WG1 Used Oil Pumps For Excavator ZX450 ZX470-5 11467-3210A

6WG1 Used Oil Pumps For Excavator ZX450 ZX470 - 5 11467-3210A

Specification

Description

Types of the oil pump

Below are the three types of oil pump used in engines and how they work:

Rotor oil pump

A rotor type of oil pump is also called a gerotor pump. It contains an inner gear that turns inside the outer rotor. The inner rotor features one less lobe than the outer one, and it’s mounted slightly off-centre of the outer rotor. This forces the outer rotor to spin at about 80% of the speed of the inner gear.

The bellow-like pumping action is created which pulls oil from the inlet port and pushes it towards the outlet port. In the rotor type of oil pump, close tolerance is required for good pumping continuality. The pump is mounted in the crankcase.

Twin Gear Pump

The twin gear pump is also known as an external pump. It is mounted inside the oil pan on the bottom of the engine. it uses two of intermeshing gears to pump oil. A shaft drives the first gear and the second gear is driven by the first gear. The shaft that drove the first gear is usually connected to the crankshaft, camshaft or distributor shaft.

The gear teeth trap oil and carry it around the outside gear from the pickup tube inlet to the outlet. There is a tight clearance between the gears which prevents the oil from flowing backwards to the inlet.

Front cover oil pump

The front cover oil pump is also known as an internal or external pump. It’s often mounted in front of the engine cover. Its working is similar to that of the rotor pump which uses an inner drive gear and outer rotor. In this case, the inner drive is mounted directly on the crankshaft.

The direct-drive approach helps to avoid the requirement of a separate pump drive shaft. The pump turns at same rpm with the engine. For this reason, more pressure generated at idle than a camshaft or distributor driven pump. Front cover types of oil pumps are used on most overhead cam engines, and also seen in late model pushrod engines.

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