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US 6,672,843 B1Granted
Dual pump apparatus comprising dual drive shafts and auxiliary pump
AssigneeHydro-Gear Limited Partnership
InventorsLonnie E. Holder, Michael Todd, Robert E. Trimble
Life of this patent
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Abstract
A dual pump apparatus for use on a vehicle or industrial application having a housing in which a pair of hydraulic pumps are mounted, having by at least one charge pump mounted on an end cap, and the trunnion arms for controlling the hydraulic pumps extending out of opposite sides of the housing. A cooling fan may be mounted on the primary or secondary input shaft on the opposite side of the pulley used to engage the prime mover. An auxiliary pump may also be mounted on the primary input shaft and may be located either at the input end thereof adjacent to the pulley, or on the opposite side of the housing.
Claims16
A pump apparatus driven by a prime mover, comprising
- (a) a housing having a first side and a second side opposite the first side, said housing comprising a pump chamber;
- (b) first and second hydraulic pumps mounted in said pump chamber;
- (c) a first input shaft drivingly engaged to said first hydraulic pump and having a proximal end extending from said first side of said housing, where said proximal end is driven by said prime mover, and a distal end;
- (d) a second input shaft mounted in said housing and having a proximal end and a distal end, said second input shaft drivingly engaged to said second pump and receiving a motive force from said first input shaft;
- (e) wherein said distal ends of said first input shaft and said second input shaft extend from said second side of said housing;
- (f) a first charge pump engaged to and driven by said distal end of first input shaft and a second charge pump engaged to and driven by said distal end of said second input shaft;
- and
- (g) an auxiliary pump mounted on said first side of said housing and driven by said first input shaft, wherein said first input shaft has a first portion having a diameter D1 and a second portion having a diameter D2, where D1 is greater than D2, and said auxiliary pump is engaged to and driven by the first portion of said first input shaft and said first hydraulic pump is engaged to and driven by said second portion of said first input shaft.
5 more elements
A pump apparatus to be driven by a prime mover, comprising:
- (a) a housing having a top and a bottom, said housing comprising a pump chamber and a gear chamber;
- (b) a first hydraulic pump and a second hydraulic pump mounted in said pump chamber;
- (c) an end cap mounted to the top of said housing and forming a running surface for said hydraulic pumps;
- (d) a first shaft mounted in said housing and having a proximal end and a distal end, and a first portion having a diameter D1 and a second portion having a diameter D2, where D1 is greater than D2, wherein the second portion of said first shaft is engaged to and driving said first pump;
- (e) a second shaft mounted in said housing and having a proximal end and a distal end, said second shaft engaged to and driving said second pump;
- (f) wherein said proximal end of said first shaft extends from said bottom of said housing to receive a motive force from said prime mover and said distal end of at least one of said first shaft and said second shaft extends from the top of said housing;
- (g) a first charge pump mounted on said end cap external to said pump chamber and driven by one of said first or second shafts;
- and
- (h) an auxiliary pump mounted on the bottom of said housing and driven by the first portion of said first shaft, wherein said auxiliary pump is engaged to and driven by the first portion of said first input shaft.
6 more elements
A pump apparatus driven by a prime mover, comprising
- (a) a housing comprising a top, a bottom and a plurality of sides connecting the said top and said bottom, and further comprising a pump chamber;
- (b) first and second hydraulic pumps mounted in said pump chamber;
- (c) a first input shaft having a proximal end extending out said bottom of said housing, where said proximal end is driven by said prime mover, and a distal end extending out said top of said housing, wherein said first input shaft has a first portion having a diameter D1 and a second portion having a diameter D2, where D1 is greater than D2, and the first hydraulic pump is driven by the first portion of said first input shaft;
- (d) a second input shaft mounted in said housing and drivingly engaged to said second pump;
- and
- (e) an auxiliary pump mounted on said bottom of said housing and driven by said second portion of said first input shaft.
3 more elements
A pump apparatus driven by a prime mover, comprising
- (a) a housing comprising a pump chamber;
- (b) first and second shafts mounted in said housing, wherein the first shaft has a first portion having a diameter D1 and a second portion having a diameter D2, where D1 is greater than D2,
- (c) a first hydraulic pump mounted in said pump chamber and driven by the second portion of the first shaft;
- (d) a first swash plate apparatus mounted in said pump chamber and engaged to said first pump, said first swash plate apparatus comprising a trunnion arm extending out a first side of said housing;
- (e) a second hydraulic pump mounted in said pump chamber and driven by the second shaft;
- (f) a second swash plate apparatus mounted in said pump chamber and engaged to said second pump, said second swash plate apparatus comprising a trunnion arm extending out a second side of said housing, where said second side of said housing is generally parallel to and opposite the first side of said housing;
- and
- (g) an auxiliary pump mounted on said housing and driven by the first portion of the first shaft.
5 more elements
Dependencies are inferred from the claim text.