Patent US3796111A successfully refreshed from Google Patents.
US3796111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydromechanical multi-range transmission
Assignee: Danfoss Power Solutions Inc
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Filing: 1971-08-18
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Granted: 1974-03-12
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Expires: 1991-08-18
Abstract
Abstract A hydromechanical transmission having an input shaft driven mechanical path and an input shaft driven hydraulic drive path with a four element differential for combining torque from the mechanical path and the hydraulic path, the transmission being provided with low and high speed ranges effecting zero to full forward output shaft speeds in both the low and high range, and a reverse in at least one of the speed ranges. The two speed ranges are effected by selectively connecting the third or the fourth control element of the differential to either the mechanical path or the hydraulic path. In one embodiment the third and fourth differential elements are selectively connected to be driven by the hydraulic path with the mechanical path continuously driving one of the differential elements. In another embodiment, the low and high speed ranges are effected by selectively connecting the third and fourth gear elements to the mechanical path with the hydraulic drive continuously drivingly connected to another of the differential elements. Also provided is a common control handle for varying the drive ratio of the hydraulic drive and also the engagement of clutches effecting the low and high speed ranges, with the control consisting of a handle member having two resiliently biased handle bars slidable in a slot with the bars being frictionally held in position within the slot and also locked in recesses in the slot defining zero output shaft speed in each of the low and high speed ranges.
Inventors
- 👤 G Schauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:26
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/02; F16H47/04; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H2037/088
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
148 words
A hydromechanical transmission, comprising; an input shaft member, an output shaft, a hydraulic drive driven by said input shaft member, a shaft member driven by said hydraulic drive, a differential mechanism including first gear means drivingly connected to one of said shaft members, second gear means drivingly connected to the output shaft, third gear means controlling the relative rotation of the first and second gear means, fourth gear means controlling the relative rotation of the first and second gear means, means providing alternative speed ranges having different maximum output shaft speeds including first and second clutch means for selectively connecting the other shaft member to the third gear means or the fourth gear means, and means for varying the drive ratio of the hydraulic drive to vary the speed of the output shaft from maximum to zero with either clutch means engaged and with the input shaft rotating.
Claim 2
Dependent Claim
148 words
A hydromechanical transmission, comprising; an input shaft member, an output shaft, a hydraulic drive driven by said input shaft member, a shaft member driven by said hydraulic drive, a differential mechanism including first gear means drivingly connected to one of said shaft members, second gear means drivingly connected to the output shaft, third gear means controlling the relative rotation of the first and second gear means, fourth gear means controlling the relative rotation of the first and second gear means, means providing alternative speed ranges having different maximum output shaft speeds including first and second clutch means for selectively connecting the other shaft member to the third gear means or the fourth gear means, and means for varying the drive ratio of the hydraulic drive to vary the speed of the output shaft from maximum to zero with either clutch means engaged and with the input shaft rotating.
Claim 3
Dependent Claim
31 words
A hydromechanical transmission as defined in claim 1, wherein said hydraulic drive includes a pump, a motor, and control means for varying the displacement of one of said pump or motor.
Claim 4
Dependent Claim
30 words
A hydromechanical transmission as defined in claim 2, wherein said control means includes means for indicating the displacement corresponding to zero output shaft speed in both ranges of the transmission.
Claim 5
Dependent Claim
180 words
A hydromechanical transmission comprising; an input shaft member, an output shaft, a hydraulic drive driven by said input shaft, a shaft member driven by said hydraulic drive, means for varying the drive ratio of the hydraulic drive, a differential mechanism including first gear means drivingly connected to one of said shaft members, second gear means drivingly connected to the output shaft, third gear means controlling the relative rotation of the first and second gear means, fourth gear means controlling the relative rotation of the first and second gear means, and means providing plural speed ranges for said transmission including means selectively connecting the other shaft member to the third gear means or the fourth gear means, wherein said first gear means is a sun gear, said second gear means being a gear carrier having pinions interengaging said sun gear, said third gear means being a ring gear interengaging said pinions, said fourth gear means being a second set of planetary pinions driven with said gear carrier, said second set of pinions being drivingly connected to said first set of pinions.
Claim 6
Dependent Claim
180 words
A hydromechanical transmission comprising; an input shaft member, an output shaft, a hydraulic drive driven by said input shaft, a shaft member driven by said hydraulic drive, means for varying the drive ratio of the hydraulic drive, a differential mechanism including first gear means drivingly connected to one of said shaft members, second gear means drivingly connected to the output shaft, third gear means controlling the relative rotation of the first and second gear means, fourth gear means controlling the relative rotation of the first and second gear means, and means providing plural speed ranges for said transmission including means selectively connecting the other shaft member to the third gear means or the fourth gear means, wherein said first gear means is a sun gear, said second gear means being a gear carrier having pinions interengaging said sun gear, said third gear means being a ring gear interengaging said pinions, said fourth gear means being a second set of planetary pinions driven with said gear carrier, said second set of pinions being drivingly connected to said first set of pinions.
Claim 7
Dependent Claim
70 words
A hydromechanical transmission as defined in claim 4, wherein said means providing plural speed ranges includes a first clutch selectively connecting said other shaft member to said ring gear, a second clutch selectively connecting said other sHaft member to said second set of pinions, and control means for engaging said first clutch and simultaneously disengaging said second clutch and for disengaging said first clutch and simultaneously engaging said second clutch.
Claim 8
Dependent Claim
29 words
A hydromechanical transmission as defined in claim 5, wherein said control means includes a common control handle for controlling said displacement varying means and said first and second clutches.
Claim 9
Dependent Claim
77 words
A hydromechanical transmission as defined in claim 6, wherein said control handle is movable in a first direction to control said displacement varying means and a second direction generally transverse to said first direction for controlling said first and second clutches, said handle being slidable in a slot, said handle including a pair of parallel, pivotal handle bars, and means biasing said bars into engagement with said slot to frictionally retain the handle in its preset position.
Claim 10
Dependent Claim
57 words
A hydromechanical transmission as defined in claim 1, wherein the hydraulic drive comprises a pump and a motor connected in closed hydraulic circuit, and the means for varying the drive ratio comprises means for varying the displacement of the pump to vary the speed of the output shaft in opposite directions from zero in both speed ranges.
Claim 11
Dependent Claim
183 words
A hydromechanical transmission, comprising; an input shaft, an output shaft, a hydraulic drive driven by said input shaft, a differential for combining hydraulic and mechanical torque in the transmission including first gear means drivingly connected to said input shaft, second gear means drivingly connected to said output shaft, third gear means for controlling the relative rotation of said first and second gear means, and fourth gear means for controlling the relative rotation of the first and second gear means, means for providing two alternative speed ranges having different maximum output shaft speeds including a first clutch for selectively connecting said hydraulic drive to drive said third gear means, a second clutch for selectively connecting the hydraulic drive to drive the fourth gear means, control means for engaging said first clutch and substantially simultaneously disengaging said second clutch and for disengaging said first clutch and substantially simultaneously engaging said second clutch, and means for varying the drive ratio of the hydraulic drive to vary the speed of the output shaft from maximum to zero with either clutch engaged and with the input shaft rotating.
Claim 12
Dependent Claim
183 words
A hydromechanical transmission, comprising; an input shaft, an output shaft, a hydraulic drive driven by said input shaft, a differential for combining hydraulic and mechanical torque in the transmission including first gear means drivingly connected to said input shaft, second gear means drivingly connected to said output shaft, third gear means for controlling the relative rotation of said first and second gear means, and fourth gear means for controlling the relative rotation of the first and second gear means, means for providing two alternative speed ranges having different maximum output shaft speeds including a first clutch for selectively connecting said hydraulic drive to drive said third gear means, a second clutch for selectively connecting the hydraulic drive to drive the fourth gear means, control means for engaging said first clutch and substantially simultaneously disengaging said second clutch and for disengaging said first clutch and substantially simultaneously engaging said second clutch, and means for varying the drive ratio of the hydraulic drive to vary the speed of the output shaft from maximum to zero with either clutch engaged and with the input shaft rotating.
Claim 13
Dependent Claim
212 words
A hydromechanical transmission comprising; an input shaft, an output shaft, a hydraulic drive driven by said input shaft, means for varying the drive ratio of the hydraulic drive, a differential for combining hydraulic and mechanical torque in the transmission including first gear means drivingly connected to said input shaft, second gear means drivingly connected to said output shaft, third gear means for controlling the relative rotation of said first and second gear means, and fourth gear means for controlling the relative rotation of the first and second gear means, means for providing two speed ranges for the transmission including a first clutch selectively connecting said hydraulic drive to drive said third gear means, a second clutch selectively connecting the hydraulic drive to drive the fourth gear means, and control means for engaging said first clutch and substantially simultaneously disengaging said second clutch and for disengaging said first clutch and substantially simultaneously engaging said second clutch, wherein said first gear means is a sun gear drivingly connected to the input shaft, said second gear means being a gear carrier and planet pinion assembly drivingly connected to the output shaft, said third gear means being a ring gear, and said fourth gear means being a second set of planetary pinions carried by said carrier.
Claim 14
Dependent Claim
212 words
A hydromechanical transmission comprising; an input shaft, an output shaft, a hydraulic drive driven by said input shaft, means for varying the drive ratio of the hydraulic drive, a differential for combining hydraulic and mechanical torque in the transmission including first gear means drivingly connected to said input shaft, second gear means drivingly connected to said output shaft, third gear means for controlling the relative rotation of said first and second gear means, and fourth gear means for controlling the relative rotation of the first and second gear means, means for providing two speed ranges for the transmission including a first clutch selectively connecting said hydraulic drive to drive said third gear means, a second clutch selectively connecting the hydraulic drive to drive the fourth gear means, and control means for engaging said first clutch and substantially simultaneously disengaging said second clutch and for disengaging said first clutch and substantially simultaneously engaging said second clutch, wherein said first gear means is a sun gear drivingly connected to the input shaft, said second gear means being a gear carrier and planet pinion assembly drivingly connected to the output shaft, said third gear means being a ring gear, and said fourth gear means being a second set of planetary pinions carried by said carrier.
Claim 15
Dependent Claim
40 words
A hydromechanical transmission as defined in claim 9, wherein said input shaft and differential are disposed on a common axis, said hydraulic drive including back-to-back Hydraulic units mounted for rotation on an axis parallel to and adjacent said first axis.
Claim 16
Dependent Claim
190 words
A hydromechanical transmission, comprising; an input shaft, an output shaft, a hydraulic drive driven by said input shaft, a planetary gear mechanism for combining torques from said input shaft and said hydraulic drive including first gear means drivingly connected to the hydraulic drive, second gear means drivingly connected to the output shaft, third gear means controlling the relative speed of the first gear means and the second gear means, and fourth gear means controlling the relative speed of the first gear means and the second gear means, means for providing alternative speed ranges having different maximum output shaft speeds including a first clutch for selectively connecting said input shaft to drive the third gear means, a second clutch for selectively connecting said input shaft to drive the fourth gear means, control means for engaging said first clutch and substantially simultaneously disengaging said second clutch, and for disengaging said first clutch and substantially simultaneously engaging said second clutch, and means for varying the drive ratio of the hydraulic drive to vary the speed of the output shaft from maximum to zero with either clutch engaged and with the input shaft rotating.
Claim 17
Dependent Claim
190 words
A hydromechanical transmission, comprising; an input shaft, an output shaft, a hydraulic drive driven by said input shaft, a planetary gear mechanism for combining torques from said input shaft and said hydraulic drive including first gear means drivingly connected to the hydraulic drive, second gear means drivingly connected to the output shaft, third gear means controlling the relative speed of the first gear means and the second gear means, and fourth gear means controlling the relative speed of the first gear means and the second gear means, means for providing alternative speed ranges having different maximum output shaft speeds including a first clutch for selectively connecting said input shaft to drive the third gear means, a second clutch for selectively connecting said input shaft to drive the fourth gear means, control means for engaging said first clutch and substantially simultaneously disengaging said second clutch, and for disengaging said first clutch and substantially simultaneously engaging said second clutch, and means for varying the drive ratio of the hydraulic drive to vary the speed of the output shaft from maximum to zero with either clutch engaged and with the input shaft rotating.
Claim 18
Dependent Claim
220 words
A hydromechanical transmission, comprising; an input shaft, an output shaft, a hydraulic drive driven by said input shaft, means for varying the drive ratio of the hydraulic drive, a planetary gear mechanism for combining torques from said input shaft and said hydraulic drive including first gear means drivingly connected to the hydraulic drive, second gear means drivingly connected to the output shaft, third gear means controlling the relative speed of the first gear means and the second gear means, and fourth gear means controlling the relative speed of the first gear means and the second gear means, means for providing plural speed ranges for the transmission including a first clutch selectively connecting said input shaft to drive the third gear means, a second clutch selectively connecting said input shaft to drive the fourth gear means, and control means for engaging said first clutch and substantially simultaneously disengaging said second clutch, and for disengaging said first clutch and substantially simultaneously engaging said second clutch, wherein said first gear means is a sun gear drivingly connected to said hydraulic drive, said second gear means being a gear carrier and pinion combination drivingly connected to said output shaft, said third gear means being a ring gear, and said fourth gear means being a second set of planetary pinions carried by said gear carrier.
Claim 19
Dependent Claim
220 words
A hydromechanical transmission, comprising; an input shaft, an output shaft, a hydraulic drive driven by said input shaft, means for varying the drive ratio of the hydraulic drive, a planetary gear mechanism for combining torques from said input shaft and said hydraulic drive including first gear means drivingly connected to the hydraulic drive, second gear means drivingly connected to the output shaft, third gear means controlling the relative speed of the first gear means and the second gear means, and fourth gear means controlling the relative speed of the first gear means and the second gear means, means for providing plural speed ranges for the transmission including a first clutch selectively connecting said input shaft to drive the third gear means, a second clutch selectively connecting said input shaft to drive the fourth gear means, and control means for engaging said first clutch and substantially simultaneously disengaging said second clutch, and for disengaging said first clutch and substantially simultaneously engaging said second clutch, wherein said first gear means is a sun gear drivingly connected to said hydraulic drive, said second gear means being a gear carrier and pinion combination drivingly connected to said output shaft, said third gear means being a ring gear, and said fourth gear means being a second set of planetary pinions carried by said gear carrier.
Claim 20
Dependent Claim
34 words
A hydromechanical transmission as defined in claim 12, said input shaft being located on a first axis, said hydraulic drive and differential mechanism being disposed on a common axis parallel with said first axis.
Claim 21
Dependent Claim
59 words
A hydromechanical transmission as defined in claim 1, wherein the hydraulic drive comprises a pump and a motor connected in closed hydraulic circuit, and the means for varying the drive ratio comprises means for varying the displacement of the pump to vary the speed of the output shaft in opposite directions from zero in at least one speed range.
Claim 22
Dependent Claim
38 words
A hydromechanical transmission as defined in claim 8, wherein the third and fourth gear means provide different gear ratios in the differential mechanism which produce different speed ranges having different proportions thereof devoted to forward and reverse direction.
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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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |