Rotary kinetic fluid motors or pumps – Smooth runner surface for working fluid frictional contact
Patent
1989-06-08
1990-07-03
Look, Edward K.
Rotary kinetic fluid motors or pumps
Smooth runner surface for working fluid frictional contact
416 4, 418152, F04D 302
Patent
active
049386603
ABSTRACT:
The invention is directed to a pump for use as a lubricating oil pump in internal combustion engines of handheld portable tools such as motor-driven chain saws or the like. The pump includes a body forming the stator and a body forming the rotor. These bodies lie coaxial with respect to each other and have respective surfaces which lie seal-tight against each other. A screw-shaped spiral slot is formed in one of these surfaces and has an input end connected to a suction connection and an output end connected with a pressure connection. According to a feature of the invention, at least the screw-shaped wall structure is made of an elastomer. This wall structure defines the spiral slot and lies against the smooth surface lying opposite thereto. An absolutely seal-tight contact engagement of the wall structure defining the spiral slot against the opposite-lying surface is assured by the elasticity of the elastomer. The service life of the pump is increased and its production and assembly simplified.
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patent: 4747762 (1988-05-01), Fairbairn
patent: 4772177 (1988-09-01), Hayashi
Geyer Werner
Nickel Hans
Schierling Roland
Schone Karsten
Andreas Stihl
Look Edward K.
Nguyen Hoang
Ottesen Walter
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