Jax,
You need to be a tad more specific. A geared pump would describe and
pump driven by a gear train. A gear pump describes a type of pump that
uses the cavitly that develops/closes between the teeth of messed gears
(involute tooth face) to move a fluid.

If you mean non-gear driven pumps, there are lots of them. Many engines
have chain or shaft drive pumps, not includeing those directly on the
crankshaft.

If you mean oil pumps that are not gear type pumps, there are lots of
those out there too. If by gear you are trying to include all positive
displacement pumps, then you are nearly correct. But there are many
engines out there with vane pumps, internal lobe pumps and progressive
cavitry pumps as primary lube oil pumps.

Matt Colie - Sig at the end of today's enteries.

JAXAshby wrote:
I have never seen any oil pump on any engine going back to designs around since
the early 20th century that were not geared, except for the B&S engine which
uses a scoop on the bottom of the connecting rod cap to supply pressure oil.

genee/rickie claim non-geared oil pumps on engines are common. Anyone know
which engine designs used oil pumps that are not geared?

Matt Colie wrote in message ...

If you mean oil pumps that are not gear type pumps, there are lots of
those out there too. If by gear you are trying to include all positive
displacement pumps, then you are nearly correct. But there are many
engines out there with vane pumps, internal lobe pumps and progressive
cavitry pumps as primary lube oil pumps.

What would you call the pump Honda uses in Accords and Civics (or used
to use)? If I recall correctly, it was a 5 lobed rotor which ran
inside a 6 lobed ring. The ring rotated along with the rotor and the
rotor lobes would sweep through the indentations between the lobes in
the ring. In this way it had positive displacement, sort of like a
cross between a Wankel and a rotary vane pump. Internal lobed pump?

%mod%

modervador wrote:

What would you call the pump Honda uses in Accords and Civics (or used
to use)? If I recall correctly, it was a 5 lobed rotor which ran
inside a 6 lobed ring. The ring rotated along with the rotor and the
rotor lobes would sweep through the indentations between the lobes in
the ring. In this way it had positive displacement, sort of like a
cross between a Wankel and a rotary vane pump. Internal lobed pump?

Gerotor

Rick