F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 27/10 (2006.01) F04B 1/12 (2006.01)
Patent
CA 2494996
Smaller and lighter hydraulic pump/motors are provided with pistons having body portions substantially as long as the axial length of the respective cylinders in which they reciprocate. A plurality of respective lubricating channels, formed circumferentially and radially transecting the walls of each cylinder, is each positioned to be closed at all times by the axial cylindrical body of each respective piston during its entire stroke. Each lubricating channel is interconnected, one to another, to form a single, continuous lubricating passageway entirely within the cylinder block and not connected by either fluid "input" or fluid "output" passageways, being replenished solely by blow-by entering from the valve end of each cylinder. A plurality of sealing members, each located near the open end of each cylinder, substantially eliminates blow-by from this lubricating passageway, thereby significantly increasing volumetric efficiency. The resulting improved lubrication, in combination with unique spring-biased holddown assemblies, permits use of variable-angle swash-plate arrangements that require neither dog-bones at the outer ends of the pistons nor conventional nutating-only wobblers.
L'invention porte sur des pompes/moteurs hydrauliques de petite taille munis de pistons dont le corps est sensiblement aussi long que le corps de leurs cylindres respectifs, et dont les cylindres comportent des lumières de graissage, circulaires et radiales obturées en permanence par les corps des pistons sur la totalité de leur course, et reliées entre elles pour former à l'intérieur du bloc de chaque cylindre un canal unique ne présentant ni entrée ni sortie mais uniquement alimenté par soufflage à partir des soupapes des cylindres. Plusieurs joints placés au voisinage de l'extrémité ouverte des cylindres éliminent pratiquement les pertes des susdits passages, améliorant ainsi le rendement volumétrique. La lubrification améliorée résultante, associée à des dispositifs abaisseurs à ressort exclusifs permet s'utiliser des plateaux oscillants à inclinaison variable ne requérant ni de biellettes aux extrémités extérieures des pistons, ni les plateaux usuels à nutation seule.
Gleasman Keith E.
Gleasman Vernon E.
Wrona Matthew R.
Kirby Eades Gale Baker
Torvec Inc.
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