US5505279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic transmission and axle assembly
Assignee: Danfoss Power Solutions Inc
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Filing: 1991-05-28
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Granted: 1996-04-09
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Expires: 2011-05-28
Abstract
Abstract An integrated hydrostatic transaxle having a common housing for a hydrostatic transmission and a pair of oppositely-extending differentially-connected axles to have the common housing provide a common sump therefor and with a specifically-shaped center section interconnecting the pair of hydraulic displacement units constituting the hydrostatic transmission. The center section is a unitary member separate from the common housing, with the exterior thereof exposed to the common sump. The center section has passages and arcuate ports which are interconnected by certain of said passages and which are located whereby the center section may be cast to minimize any machining required to finish the center section. Such casting can result in a porous center section with possible leakage from a passage having high pressure fluid. However, such leakage is not a problem since the leakage would not be through the wall of the common housing but to the common sump within the common housing which is at atmospheric pressure because of the center section being separate from the common housing.
Inventors
- 👤 Joseph E. Louis
- 👤 Alan W. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:12
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/04; B60K17/10; B60K17/105; B60Y; B60Y2200/00; B60Y2200/20; B60Y2200/22; B60Y2200/223; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19149; Y10T74/20; Y10T74/20207; Y10T74/20256; Y10T74/20268; Y10T74/20274; Y10T74/2028; Y10T74/20287; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separable elements of said axle assembly, wherein said two separable elements are separable at a parting plane generally parallel to the longitudinal axes of said axles shafts; means on said hydrostatic transmission for fastening the same to one of said separable elements within said housing, differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, and means on said hydrostatic transmission to permit leakage of high pressure fluid from one of said fluid conducting conduits to the interior of said housing.
Claim 2
Dependent Claim
139 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separable elements of said axle assembly, wherein said two separable elements are separable at a parting plane generally parallel to the longitudinal axes of said axles shafts; means on said hydrostatic transmission for fastening the same to one of said separable elements within said housing, differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, and means on said hydrostatic transmission to permit leakage of high pressure fluid from one of said fluid conducting conduits to the interior of said housing.
Claim 3
Dependent Claim
128 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separable elements of said axle assembly, wherein said two separable elements are separable at a parting plane generally parallel to the longitudinal axes of said axles shafts; means on said hydrostatic transmission for fastening the same to one of said separable elements within said housing, differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, and a gear reduction means operatively connecting said hydrostatic transmission and said differential gearing means.
Claim 4
Dependent Claim
128 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separable elements of said axle assembly, wherein said two separable elements are separable at a parting plane generally parallel to the longitudinal axes of said axles shafts; means on said hydrostatic transmission for fastening the same to one of said separable elements within said housing, differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, and a gear reduction means operatively connecting said hydrostatic transmission and said differential gearing means.
Claim 5
Dependent Claim
117 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separate elements of said axle assembly, wherein said two separate elements are separable at a parting plane generally parallel to the longitudinal axes of said axle shafts; said hydrostatic transmission having an output power shaft parallel to said axle shafts; differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, and a gear train internally disposed within said housing.
Claim 6
Dependent Claim
117 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separate elements of said axle assembly, wherein said two separate elements are separable at a parting plane generally parallel to the longitudinal axes of said axle shafts; said hydrostatic transmission having an output power shaft parallel to said axle shafts; differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, and a gear train internally disposed within said housing.
Claim 7
Dependent Claim
142 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separate elements of said axle assembly, wherein said two separate elements are separable at a parting plane generally parallel to the longitudinal axes of said axle shafts; said hydrostatic transmission having an output power shaft parallel to said axle shafts; differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, a gear train internally disposed within said housing, and means on said hydrostatic transmission to permit leakage of high pressure fluid from one of said fluid conducting conduits to the interior of said housing.
Claim 8
Dependent Claim
142 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separate elements of said axle assembly, wherein said two separate elements are separable at a parting plane generally parallel to the longitudinal axes of said axle shafts; said hydrostatic transmission having an output power shaft parallel to said axle shafts; differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, a gear train internally disposed within said housing, and means on said hydrostatic transmission to permit leakage of high pressure fluid from one of said fluid conducting conduits to the interior of said housing.
Claim 9
Dependent Claim
131 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separate elements of said axle assembly, wherein said two separate elements are separable at a parting plane generally parallel to the longitudinal axes of said axle shafts; said hydrostatic transmission having an output power shaft parallel to said axle shafts; differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, a gear train internally disposed within said housing, and a gear reduction means operatively connecting said hydrostatic transmission and said differential gearing means.
Claim 10
Dependent Claim
131 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separate elements of said axle assembly, wherein said two separate elements are separable at a parting plane generally parallel to the longitudinal axes of said axle shafts; said hydrostatic transmission having an output power shaft parallel to said axle shafts; differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, a gear train internally disposed within said housing, and a gear reduction means operatively connecting said hydrostatic transmission and said differential gearing means.
Claim 11
Dependent Claim
122 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separable elements of said axle assembly, wherein said two separable elements are separable at a parting plane generally parallel to the longitudinal axes of said axle shafts; means on said hydrostatic transmission for fastening the same to one of said separable elements within said housing, differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, and a gear train internally disposed within said housing.
Claim 12
Dependent Claim
122 words
An axle assembly comprising, a housing for an internally disposed hydrostatic transmission; a hydrostatic transmission separate from said housing and mounted within said housing; axle shafts rotatably supported in said housing; said housing being defined by at least two separable elements of said axle assembly, wherein said two separable elements are separable at a parting plane generally parallel to the longitudinal axes of said axle shafts; means on said hydrostatic transmission for fastening the same to one of said separable elements within said housing, differential gearing means supported by said housing drivingly connected between said hydrostatic transmission and said axle shafts, said hydrostatic transmission including fluid conducting conduits interconnecting hydrostatic rotatable cylinder blocks, and a gear train internally disposed within said housing.
Claim 13
Dependent Claim
26 words
An axle assembly according to claim 6 wherein said hydrostatic transmission has a center section separate from said housing and engaging each of said cylinder blocks.
Claim 14
Dependent Claim
35 words
An axle assembly according to claim 6 wherein one of said rotatable cylinder blocks is a hydrostatic pump means having a pump shaft, said pump shaft having a longitudinal axis perpendicular to said parting plane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |