US4589293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency PTO driving unit
Assignee: Exedy Corp
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Filing: 1984-06-06
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Granted: 1986-05-20
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Expires: 2004-06-06
Abstract
Abstract An emergency PTO driving unit including an emergency PTO pump being normally equipped to a vehicle for an industrial machinery, said emergency PTO pump being interconnected through a clutch unit to an axle to utilize rotation of a wheel as a power source for driving the pump, said clutch unit being so composed that the clutch is brought into a "disengaged" state by means of a hydraulic pressure supplied from a proper hydraulic pump driven by an engine when the engine is running, and the clutch is brought into an "engaged" state by means of a spring means when the engine is stopped.
Inventors
- 👤 Mituyoshi Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:29
CPC Classifications
B; B60; B60K; B60K25/00; B60K25/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
253 words
An emergency PTO driving unit for an industrial machinery vehicle having a hydraulically operated power steering unit supplied with operating hydraulic pressure from an engine-driven hydraulic pump during running of an engine of said vehicle, said emergency PTO driving unit being operable to supply emergency hydraulic pressure to said power steering unit under conditions of traveling of said vehicle with said engine stopped, said emergency PTO driving unit comprising: a PTO pump having a delivery port connected to supply emergency hydraulic pressure to said power steering unit; a pump driving shaft for driving said emergency PTO pump and in driven connection with a wheel axle of said vehicle; and a hydraulically-operated PTO pump clutch unit for selectively mechanically coupling said PTO pump with said pump driving shaft, said PTO pump clutch unit being in communication with said engine-driven hydraulic pump and maintained in a disengaged state by said operating hydraulic pressure supplied from said engine-driven hydraulic pump during running of said engine such that said PTO pump is not driven by said pump driving shaft, said PTO pump clutch having spring means acting in opposition to said operating hydraulic pressure for engaging said PTO pump clutch unit when supplying of said operating hydraulic pressure ceases upon stopping of said engine, such that said PTO pump is mechanically coupled with said pump driving shaft; whereby, under traveling of said vehicle with said engine stopped, said PTO pump is driven via said wheel axle to supply said emergency hydraulic pressure to said power steering unit.
Claim 2
Dependent Claim
253 words
An emergency PTO driving unit for an industrial machinery vehicle having a hydraulically operated power steering unit supplied with operating hydraulic pressure from an engine-driven hydraulic pump during running of an engine of said vehicle, said emergency PTO driving unit being operable to supply emergency hydraulic pressure to said power steering unit under conditions of traveling of said vehicle with said engine stopped, said emergency PTO driving unit comprising: a PTO pump having a delivery port connected to supply emergency hydraulic pressure to said power steering unit; a pump driving shaft for driving said emergency PTO pump and in driven connection with a wheel axle of said vehicle; and a hydraulically-operated PTO pump clutch unit for selectively mechanically coupling said PTO pump with said pump driving shaft, said PTO pump clutch unit being in communication with said engine-driven hydraulic pump and maintained in a disengaged state by said operating hydraulic pressure supplied from said engine-driven hydraulic pump during running of said engine such that said PTO pump is not driven by said pump driving shaft, said PTO pump clutch having spring means acting in opposition to said operating hydraulic pressure for engaging said PTO pump clutch unit when supplying of said operating hydraulic pressure ceases upon stopping of said engine, such that said PTO pump is mechanically coupled with said pump driving shaft; whereby, under traveling of said vehicle with said engine stopped, said PTO pump is driven via said wheel axle to supply said emergency hydraulic pressure to said power steering unit.
Claim 3
Dependent Claim
32 words
An emergency PTO driving unit as set forth in claim 1, wherein said engine-driven hydraulic pump is a hydraulic pump for operating a hydraulic traveling clutch of a transmission of said vehicle.
Claim 4
Dependent Claim
174 words
An emergency PTO driving unit as set forth in claim 1, wherein said PTO pump clutch unit is provided with a splined cylindrical shaft acted upon by said spring means and fitted freely slidingly in an axial direction thereof on a pump input shaft of said PTO pump, said cylindrical shaft and said pump driving shaft being axially aligned with one another and each having respective facing ends thereof provided with clutch claws; whereby, under conditions of running of said engine and supplying of said operating hydraulic pressure to said PTO clutch unit from said engine-driven hydraulic pump, said spline cylindrical shaft is maintained spaced apart from said pump driving shaft such that the respective clutch claws thereof are disengaged from each other, and upon stopping of said engine and ceasing of supplying of said operating hydraulic to said PTO clutch unit, said cylindrical shaft is urged axially by said spring means toward said pump driving shaft to engage said respective clutch claws thereof with one another so that said PTO clutch becomes engaged.
Claim 5
Dependent Claim
19 words
An emergency PTO driving unit as set forth in claim 3 wherein said spring means is a coil spring.
Claim 6
Dependent Claim
75 words
An emergency PTO driving unit as set forth in claim 3, wherein said PTO pump is provided in a pump mounting bed secured to a transmission case, said cylindrical shaft is fitted in an inner peripheral surface of said pump mounting bed, and an annular oil chamber fluidly interconnected to said engine-driven hydraulic pump is formed between an outer peripheral surface of said cylindrical shaft and said inner peripheral surface of said pump mounting bed.
Claim 7
Dependent Claim
30 words
An emergency PTO driving unit as set forth in any of claims 1, 3, 4 or 5, wherein said engine-driven hydraulic pump is a power steering pump of said vehicle.
Claim 8
Dependent Claim
45 words
An emergency PTO driving unit as set forth in claim 1 wherein said pump driving shaft is provided at an end thereof opposite said PTO clutch unit with a first gear drivingly engaged with a second gear provided on said wheel axle of said vehicle.
References Cited (Backward Citations)
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Cited
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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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |