6WG1 Used Oil Pumps For Excavator ZX450 ZX470 - 5 11467-3210A
Specification
| Item name | Engine oil pump |
| Gear quantity | 30 |
| Application | Engineering Machinery Engine |
| Cylinder number | 6 cylinders |
| Quality | High quality |
| Type | Diesel Engine |
| Injection | Direct injection or Electric Injection |
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.
