Claims
- 1. In a hydrostatic transmission comprising a casing; an internal transverse partitioning wall dividing said casing into first and second chambers; a pintle fixedly and non-rotatably mounted in said partitioning wall, said pintle having first and second ends extending into said first and second chambers, respectively, and internal parallel first and second hydraulic fluid passages terminating in ports; a rotary cylinder barrel rotatably mounted on each of said first and second extending pintle ends, each said barrel comprising a plurality of radially arranged cylinders and a plurality of pistons disposed in said cylinders, said cylinders successively communicating with said ports during rotation of said barrels; an annular cam track surrounding each said barrel, said pistons engaging said cam track; first and second rotary shafts rotatably mounted in said casing and extending into said first and second chambers, respectively; and means coupling said shafts to said barrels; the improvement in which: a non-return valve is mounted in at least one of said first and second pintle ends, said valve admitting make-up fluid to a said fluid passage when pressure in said chamber corresponding to said at least one end exceeds that in said passage; and said coupling means exposes said at least one pintle end, and hence said valve, to said corresponding chamber.
- 2. Hydrostatic transmission according to claim 1, and a pair of pressure relief valves closing said first and second fluid passages, said valve pair being disposed at said first pintle end and said non-return valve being mounted in said second pintle end.
- 3. Hydrostatic transmission according to claim 1, wherein a separate said non-return valve is associated with each of said first and second fluid passages.
- 4. Hydrostatic transmission according to claim 1, wherein said cylinders are closer to said partitioning wall than said non-return valve.
Priority Claims (2)
Number |
Date |
Country |
Kind |
8216154 |
Jun 1982 |
GBX |
|
PCT/EP83/00135 |
May 1983 |
WOX |
|
Parent Case Info
This application is a continuation of application Ser. No. 590,590, filed Jan. 26, 1984, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (4)
Number |
Date |
Country |
568722 |
Jul 1958 |
BEX |
1053148 |
Sep 1953 |
FRX |
803228 |
Oct 1958 |
GBX |
834459 |
May 1960 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
590590 |
Jan 1984 |
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