US3603084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for driving a device mounted on special-purpose vehicles
Assignee: Shinmaywa Industries Ltd
•
Filing: 1969-07-31
•
Granted: 1971-09-07
•
Expires: 1989-07-31
Abstract
Abstract An apparatus for driving a device mounted on special-purpose vehicles and the like having an engine, including a hydraulic pump driven by the engine and a hydraulic motor driven by the pump for driving said device. The pump is typically of a swashplate type with the tilting angle thereof being adjustable through a hydraulic piston and cylinder device incorporating a changeover valve by means of a manual operation lever. Another changeover valve is provided for switching the apparatus to an automatic operation in which the rotational speed of the hydraulic motor is kept constant irrespective of the rotational speed of the engine.
Inventors
- 👤 Takashi Okazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:30
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; B; B28; B28C; B28C5/00; B28C5/42; B28C5/4203; B28C5/4206; B28C5/421; B28C5/4213; F16H61/47
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
188 words
In an apparatus for driving a machine mounted on a specialpurpose vehicle and the like, comprising an engine, a variable capacity hydraulic pump driven by said engine, a hydraulic motor driven by pressurized fluid from said hydraulic pump to drive said machine, an auxiliary pump driven by said engine to provide a hydraulic control pressure, and servo-cylinder means for controlling the capacity of said hydraulic pump, the improvement including manual means for operating said servo-cylinder means to change the capacity of said hydraulic pump, piston-cylinder means incorporating therein a piston adapted to receive the control pressure from said auxiliary pump and a resilient means acting on said piston to oppose the force of said control pressure acting on the piston, said piston being displaced in either axial direction in response to increase or decrease of said control pressure from a predetermined value due to increase or decrease of the speed of said engine, respectively, and means responsive to the displacement of said piston for automatically operating said servo-cylinder means to change the capacity of said hydraulic pump so as to keep the speed of said hydraulic motor constant.
Claim 2
Dependent Claim
188 words
In an apparatus for driving a machine mounted on a specialpurpose vehicle and the like, comprising an engine, a variable capacity hydraulic pump driven by said engine, a hydraulic motor driven by pressurized fluid from said hydraulic pump to drive said machine, an auxiliary pump driven by said engine to provide a hydraulic control pressure, and servo-cylinder means for controlling the capacity of said hydraulic pump, the improvement including manual means for operating said servo-cylinder means to change the capacity of said hydraulic pump, piston-cylinder means incorporating therein a piston adapted to receive the control pressure from said auxiliary pump and a resilient means acting on said piston to oppose the force of said control pressure acting on the piston, said piston being displaced in either axial direction in response to increase or decrease of said control pressure from a predetermined value due to increase or decrease of the speed of said engine, respectively, and means responsive to the displacement of said piston for automatically operating said servo-cylinder means to change the capacity of said hydraulic pump so as to keep the speed of said hydraulic motor constant.
Claim 3
Dependent Claim
67 words
The apparatus according to claim 1, further including a changeover valve movable between a first position in which it connects said piston-cylinder means to said auxiliary pump for automatic operation of said servo-cylinder means and a second position in which it disconnects said piston-cylinder means from said auxiliary pump and allows hydraulic fluid within said piston-cylinder means to be exhausted for manual operation of said servo-cyliNder means.
Claim 4
Dependent Claim
89 words
The apparatus according to claim 1, wherein said servo-cylinder means includes a cylinder and a servo-piston slidable therein and said means responsive to the displacement of the piston in said piston-cylinder means comprises hydraulic circuit changeover means to control the flow of hydraulic fluid into and out of the cylinder spaces on both sides of the servo-piston, said servo-piston being connected to said variable capacity hydraulic pump to change the capacity of the latter and feedback means to feed back the movement of said servo-piston to said piston-cylinder means.
Claim 5
Dependent Claim
59 words
The apparatus according to claim 1, wherein said servo-cylinder means includes a cylinder and a servo-piston slidable therein and said means responsive to the displacement of the piston in said piston-cylinder means comprises means for connecting said piston to said servo-piston and said servo-piston being connected to said variable capacity hydraulic pump to change the capacity of the latter.
Claim 6
Dependent Claim
22 words
The apparatus according to claim 4, wherein said servo-piston in said servo-cylinder means and said piston in said piston-cylinder means are coaxial.
Claim 7
Dependent Claim
38 words
The apparatus according to claim 4, wherein said servo-cylinder means and said piston-cylinder means have their cylinders rigidly connected to each other and said servo-piston in said servo-cylinder means and said piston in said piston-cylinder means are coaxial.
Claim 8
Dependent Claim
20 words
The apparatus according to claim 4, wherein said means for connecting the piston to the servo-piston is a link mechanism.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |