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US 5,628,189 AGranted
Charge pump for axle driving apparatus including hydrostatic transmission
AssigneeHydro-Gear Limited Partnership
InventorsRay Hauser, Daryl Smothers, John Schreier
Life of this patent
Estimating the term…
Abstract
A hydrostatic drive apparatus for transferring power from a light duty vehicle engine to an output axle, including a charge pump for providing additional hydraulic fluid to a hydrostatic transmission in the apparatus, wherein the charge pump is mounted external to the housing of the drive apparatus.
Claims17
An apparatus for transmitting power from a vehicle engine to an output shaft, comprising:
- a housing;
- a hydrostatic transmission disposed substantially within said housing, said hydrostatic transmission comprising a center section having hydraulic porting formed therein;
- a pump mounted on said center section and drivingly linked to said vehicle engine;
- and a motor mounted on said center section and hydraulically connected through said hydraulic porting to said pump, said motor being drivingly connected to said output shaft;
- a sump containing hydraulic fluid in flow communication with said hydrostatic transmission for supplying hydraulic fluid thereto;
- a charge pump mounted on an external surface of said housing and spaced from said hydrostatic transmission for creating high pressure hydraulic fluid;
- a gallery, in hydraulic fluid flow communication with said charge pump and said hydraulic porting, formed in the space between said charge pump and said hydrostatic transmission for providing a storage location for a quantity of said high pressure hydraulic fluid;
- at least one check valve associated with said hydraulic porting for controlling the flow of said high pressure hydraulic fluid from said gallery to said hydraulic porting;
- and
- at least on relief valve associated with said gallery for diverting said high pressure hydraulic fluid from said gallery to said sump.
7 more elements
An apparatus for transmitting power from a vehicle engine to an output shaft, comprising:
- a housing;
- a hydrostatic transmission disposed substantially within said housing, said hydrostatic transmission comprising a center section having hydraulic porting formed therein;
- a pump mounted on said center section and drivingly linked to said vehicle engine;
- and a motor mounted on said center section and hydraulically connected through said hydraulic porting to said pump, said motor being drivingly connected to said output shaft;
- a sump containing hydraulic fluid in flow communication with said hydrostatic transmission for supplying hydraulic fluid thereto;
- a porting plate disposed substantially adjacent to the external surface of said housing having internal porting formed therein, said internal porting being in flow communication with said hydraulic porting;
- a charge cover mounted over said porting plate;
- and
- a charge pump in flow communication with said internal porting mounted between said porting plate and said charge cover.
6 more elements
An apparatus for transmitting power from a vehicle engine to an output shaft, comprising:
- a housing comprising an upper casing and a lower casing, said lower casing having casing porting formed therein;
- a hydrostatic transmission disposed substantially within said housing, said hydrostatic transmission comprising a center section having hydraulic porting formed therein;
- a pump mounted on said center section and drivingly linked to said vehicle engine;
- and a motor mounted on said center section and hydraulically connected through said hydraulic porting to said pump, said motor being drivingly connected to said output shaft;
- a sump containing hydraulic fluid in flow communication with said hydrostatic transmission for supplying hydraulic fluid thereto;
- a charge cover secured to the lower casing and hydraulically connected to said hydrostatic transmission and said sump through said casing porting;
- and
- a gerotor mounted in said charge cover and drivingly connected to said vehicle engine.
5 more elements
Dependencies are inferred from the claim text.