Oil Supply through a Shaft
Oil Supply through a Shaft
(OP)
Hey everyone,
I have a constant oil supply to a shaft that I need to turn off/on purely mechanically. The oil supply on one side to the shaft never stops. I want to control the oil exiting the other side. Moreover, I want this control to occur when the shaft rotates and stops.
That is, I am looking for a purely passive device that can do the following:
a) The shaft is stopped. No Oil can get through the shaft. Oil is at <1pisg.
b) The shaft starts spinning. Oil can now flow through the shaft somehow.
I can't put any externally controlled valves etc. The oil must be able to pass only via the shafts rotation (and whatever other passive components we can fit inside it to accomplish this).
Any thoughts would be appreciated. I'm unaware of a device like this.
Thanks.
Fe
I have a constant oil supply to a shaft that I need to turn off/on purely mechanically. The oil supply on one side to the shaft never stops. I want to control the oil exiting the other side. Moreover, I want this control to occur when the shaft rotates and stops.
That is, I am looking for a purely passive device that can do the following:
a) The shaft is stopped. No Oil can get through the shaft. Oil is at <1pisg.
b) The shaft starts spinning. Oil can now flow through the shaft somehow.
I can't put any externally controlled valves etc. The oil must be able to pass only via the shafts rotation (and whatever other passive components we can fit inside it to accomplish this).
Any thoughts would be appreciated. I'm unaware of a device like this.
Thanks.
Fe





RE: Oil Supply through a Shaft
Can you do something to ensure the shaft always stops in one position when the unit is stopped? If so, one local zone of the oil slot on the outlet could be narrowed (or an elastomeric seal included in it) to reduce flow when the bleed hold in the shaft is in that location (assuming the oil is bleeding out thru a radial port in the shaft).
RE: Oil Supply through a Shaft
RE: Oil Supply through a Shaft
btrueblood, the pressure can be up to 1 bar, but should work with pressure close to atm as well.
It's a small shaft (30mm) and is mounted to a performance engine. The shaft can be stopped int he same location every time but it is subject to inertial loads from driving conditions.
Compositepro, I initially looked at a centrifugal design. I concluded that the mass I needed was very high and couldn't fit it within the 30x30mm package.
I am not familiar with a phase capacitor switch. I'll have a look.
RE: Oil Supply through a Shaft
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P.E. Metallurgy, Plymouth Tube
RE: Oil Supply through a Shaft
I considered something similar. Trick may be to provide a method of operation that doesn't allow it to open with the oil pressure and only centrifugal force.
I may only have <70g at 10mm to utilize also. Imagine the mass at the end of the leaf likely will have to be at most a cylinder or block 15mm by 15mm.
RE: Oil Supply through a Shaft
We used spring steel leaf about 1.5" long and added a small blob of solder on end.
Make sure to use thin enough material, like a reed valve.
The stop tab was just a "Z" of steel strip tacked to the shaft.
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P.E. Metallurgy, Plymouth Tube
RE: Oil Supply through a Shaft
This leaves me with <1N of force if I use a mass within my constraints.