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another option for the oil pump

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Michael S.:
Some time ago I discovered this drawing of an oil pump at the flea market. You can see a way of pumping oil that I don't know about.
Unfortunately there is no information about what this oil pump is used for. But I find the mechanism interesting. A completely different construction of oil pumps.
(The handwriting is old German script. Not easy to read. Appears to be from January 11th, 1892. It is not a print but drawn with ink.)

Michael

gbritnell:
Basically a ratchet driven pump. The lever is connected by a link to the cross head of an engine. As it oscillates it moves the arm with the pawl and this in turn rotates the toothed wheel which has a Scotch yoke connection to the pump shaft.  The amount of feed is controlled by the position of the link rod hooked to the pawl arm.
A lot of steam traction engines use this type of pump but the pump assembly is inside a box full of oil.

Michael S.:
Yes, the drive is like all oil pumps. I think the changeover valve is unusual, but necessary in this case.

Michael

Jasonb:
Yes as you say the valve is unusual and would only allow a set amount of oil into the pump chamber per stroke. Looks like there may be some adjustment of how long the valve is open by moving the pawls

The usual ratchet type found on traction engines etc just have the pump chamber open to the oil resovoir which completely fills it as the piston withdraws.

Vixen:
I think that direction control (changeover) valve arrangement is very clever.  :thinking:

Mike

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