Item 0737
DESIGN: SynchroLite ~
Power Train - Lubrication - Pump
Drawing:
February 5, 2000 At present the scraper type pump looks best
October 3, 2001 See:
DESIGN: SynchroLite ~ Power Train - Rotor-Synchro - Layout ~ LubricationNotes re Gear type Pump:
Positives:
Very little equipment or weight is added by this method.
The oil going to the masts is comes from the top of the gears. The teeth at the bottom of the gears are smaller so this acts a slight restriction in helping to drive oil to the masts.
Negatives:
The gears must be totally immersed in the oil for this concept to work. At 600 rpm will the oil aerate?
The pressure required to cause the oil to flow will be basically equal on all surfaces. This will require a restriction to the oil not going up the masts and this restriction will creat additional heat and will consume some of the power.
If the synchro gears are used in a gear pump fashion the they will deliver somewhat less than 11 gallons per minute, See[Power Train - Lubrication] Document B166 This is way too much.
General:
If permanently lubricated bearings are used at the top of the masts then the oil only has to be raised one foot instead of four. Also the oil is required mainly for the gearing not the bearings. This does nothing for cooling of the oil.
Notes re Vane type Pump:
General:
The oil must flow forward from the meshing gears at the back to fill the voids created by the spreading gears at the front. What about a vane type impeller that assists with this flow and helps throw some of the oil up to the XXXX?
Notes re Scraper type Pump:
General:
Idea: Consider "scraping" the oil of the bottom of the 2 gears where they come together.
Positives:
The oil is coming from 2 gears.
It is being squeezed into this area by the meshing of the 2 gears.
The gears do not have to be totally emerged in oil, only their outside lower portions do.
A small friction "roller/cam pump could be driven from these 2 gears to assist, if required.
General Notes, E-mail and Postings:
PRA Date: February 04, 2000
I would appreciate knowing if your recieving "nipple" is on the side where;
A/ the teeth of the pinion and ring are seperating; and the oil flow is caused by the ring gear teeth throwing the oil, like a vane pump. -or-
B/ the teeth of the pinion and ring are comming together ; and the oil flow is caused by the engaging tooth of one gear forcing the oil out of the space between two teeth of the other gear, like a gear pump.
Reply:
Author: Hennie Roets (carfone@gcs.co.za)
Subject: Vane pump
It is like you said in your A question. It is getting the oil more like a vane pump.
It is actually kind of scraping the stream of oil off the crownwheel after the crown wheel
came from the pinion if you know what I mean. Its not very easy to explain.
I think there must be quite a stream of oil flowing beacause of the rotational movement
of the gears. It is only a case of putting the pickup in the correct place.
Also see;
OTHER: Mechanics - General - Lubrication
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Last Revised: June 16, 2003