US3585901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pump
Assignee: Sundstrand Corp
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Filing: 1969-02-19
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Granted: 1971-06-22
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Expires: 1989-02-19
Abstract
Abstract A hydraulic pump of the multiple piston and cylinder type having inlet and outlet ports in a valve plate which serially communicate with the cylinders, with each of the ports being defined by the following, (1) a tapered fishtail groove which communicates with each cylinder prior to the time the piston in the cylinder reaches one of its dead center positions (2) a circular port extending through the valve plate and communicating with the trailing end of the fishtail groove, and (3) an elongated arcuate port separate from and trailing the circular port.
Inventors
- 👤 Harry C Moon Jr
- 👤 Stephen R Schoening
- 👤 John C Knobloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:27
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/20; F04B1/2014; F04B1/2021
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
219 words
A hydraulic energy translating device, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, valve means including a valve plate, outlet port means in said valve plate including means in said valve plate for gradually increasing communication between the approaching cylinders and the outlet port so that the pressure rise in the approaching cylinder will be gradual, said means for gradually increasing communication between the approaching cylinders and the outlet port means being positioned so that the approaching cylinder communicates with the outlet port prior the time when the associated piston reaches its dead center position so that the pressure rise in the cylinder is reduced by the movement of the associated piston toward its dead center position including a tapered groove in said valve plate increasing in depth and width toward the outlet port means to provide uniformly increasing communication between the approaching cylinder and the outlet port means.
Claim 2
Dependent Claim
219 words
A hydraulic energy translating device, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, valve means including a valve plate, outlet port means in said valve plate including means in said valve plate for gradually increasing communication between the approaching cylinders and the outlet port so that the pressure rise in the approaching cylinder will be gradual, said means for gradually increasing communication between the approaching cylinders and the outlet port means being positioned so that the approaching cylinder communicates with the outlet port prior the time when the associated piston reaches its dead center position so that the pressure rise in the cylinder is reduced by the movement of the associated piston toward its dead center position including a tapered groove in said valve plate increasing in depth and width toward the outlet port means to provide uniformly increasing communication between the approaching cylinder and the outlet port means.
Claim 3
Dependent Claim
163 words
A hydraulic energy translating device, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, valve means including a valve plate, said valve plate having inlet and outlet port means therein, at least one of said port means including a tapered groove at the leading edge thereof providing gradually increasing communication between the approaching cylinder and the outlet port, said one port means including a discrete aperture through the valve plate at the trailing end of the tapered groove, said one port means also including an elongated aperture separate from and trailing said discrete aperture.
Claim 4
Dependent Claim
163 words
A hydraulic energy translating device, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, valve means including a valve plate, said valve plate having inlet and outlet port means therein, at least one of said port means including a tapered groove at the leading edge thereof providing gradually increasing communication between the approaching cylinder and the outlet port, said one port means including a discrete aperture through the valve plate at the trailing end of the tapered groove, said one port means also including an elongated aperture separate from and trailing said discrete aperture.
Claim 5
Dependent Claim
31 words
A hydraulic energy translating device as defined in claim 2, wherein both the inlet and the outlet port means include said tapered groove, said discrete aperture and said separate elongated aperture.
Claim 6
Dependent Claim
163 words
A hydraulic energy translating device, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, valve means including a valve plate, said valve plate having inlet and outlet port means therein, at least one of said port means including a tapered groove at the leading edge thereof providing gradually increasing communication between the approaching cylinder and the outlet port, said one port means including a discrete aperture through the valve plate at the trailing end of the tapered groove, said one port means also including an elongated aperture separate from and trailing said discrete aperture.
Claim 7
Dependent Claim
163 words
A hydraulic energy translating device, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, valve means including a valve plate, said valve plate having inlet and outlet port means therein, at least one of said port means including a tapered groove at the leading edge thereof providing gradually increasing communication between the approaching cylinder and the outlet port, said one port means including a discrete aperture through the valve plate at the trailing end of the tapered groove, said one port means also including an elongated aperture separate from and trailing said discrete aperture.
Claim 8
Dependent Claim
31 words
A hydraulic energy translating device as defined in claim 2, wherein both the inlet and the outlet port means include said tapered groove, said discrete aperture and said separate elongated aperture.
Claim 9
Dependent Claim
46 words
A hydraulic energy translating device as defined in claim 2, wherein said tapered groove is positioned with respect to said dead center axis so that the approaching cylinder communicates with said one port means prior to the time the associated piston reaches its dead center position.
Claim 10
Dependent Claim
194 words
A hydraulic pump, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, a valve plate having low-pressure inlet port means and high-pressure outlet port means therein, at least one of said port means including means providing gradually increasing communication between the approaching cylinder and the associated port, said means providing gradually increasing communication between the approaching cylinder and the associated port being positioned with respect to said dead center axis so that the approaching cylinder communicates with the associated port prior to the piston in the cylinder arriving at its dead center position, including a tapered groove in said valve plate increasing in depth and width toward the outlet port means to provide uniformly increasing communication between the approaching cylinder and the outlet port means.
Claim 11
Dependent Claim
194 words
A hydraulic pump, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, a valve plate having low-pressure inlet port means and high-pressure outlet port means therein, at least one of said port means including means providing gradually increasing communication between the approaching cylinder and the associated port, said means providing gradually increasing communication between the approaching cylinder and the associated port being positioned with respect to said dead center axis so that the approaching cylinder communicates with the associated port prior to the piston in the cylinder arriving at its dead center position, including a tapered groove in said valve plate increasing in depth and width toward the outlet port means to provide uniformly increasing communication between the approaching cylinder and the outlet port means.
Claim 12
Dependent Claim
209 words
A hydraulic pump, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, a valve plate having low-pressure inlet port means and high-pressure outlet port means therein, at least one of said port means including means providing gradually increasing communication between the approaching cylinder and the associated port, said means providing gradually increasing communication between the approaching cylinder and the associated port being positioned with respect to said dead center axis so that the approaching cylinder communicates with the associated port prior to the piston in the cylinder arriving at its dead center position, said one port means being the outlet port and the means providing gRadual communication being a tapered groove in the valve plate positioned so that the approaching cylinder communicates with the outlet port prior to when the piston in the cylinder reaches its bottom dead center position.
Claim 13
Dependent Claim
209 words
A hydraulic pump, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, a valve plate having low-pressure inlet port means and high-pressure outlet port means therein, at least one of said port means including means providing gradually increasing communication between the approaching cylinder and the associated port, said means providing gradually increasing communication between the approaching cylinder and the associated port being positioned with respect to said dead center axis so that the approaching cylinder communicates with the associated port prior to the piston in the cylinder arriving at its dead center position, said one port means being the outlet port and the means providing gRadual communication being a tapered groove in the valve plate positioned so that the approaching cylinder communicates with the outlet port prior to when the piston in the cylinder reaches its bottom dead center position.
Claim 14
Dependent Claim
210 words
A hydraulic pump, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, a valve plate having low-pressure inlet port means and high-pressure outlet port means therein, at least one of said port means including means providing gradually increasing communication between the approaching cylinder and the associated port, said means providing gradually increasing communication between the approaching cylinder and the associated port being positioned with respect to said dead center axis so that the approaching cylinder communicates with the associated port prior to the piston in the cylinder arriving at its dead center position, said one port means being the inlet port means and the means providing gradually increasing communication being a tapered groove in the valve plate positioned to communicate the approaching cylinder with the inlet port prior to when the piston in the cylinder reaches its top dead center position.
Claim 15
Dependent Claim
210 words
A hydraulic pump, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, a valve plate having low-pressure inlet port means and high-pressure outlet port means therein, at least one of said port means including means providing gradually increasing communication between the approaching cylinder and the associated port, said means providing gradually increasing communication between the approaching cylinder and the associated port being positioned with respect to said dead center axis so that the approaching cylinder communicates with the associated port prior to the piston in the cylinder arriving at its dead center position, said one port means being the inlet port means and the means providing gradually increasing communication being a tapered groove in the valve plate positioned to communicate the approaching cylinder with the inlet port prior to when the piston in the cylinder reaches its top dead center position.
Claim 16
Dependent Claim
210 words
A hydraulic pump, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, a valve plate having low-pressure inlet port means and high-pressure outlet port means therein, at least one of said port means including means providing gradually increasing communication between the approaching cylinder and the associated port, said means providing gradually increasing communication between the approaching cylinder and the associated port being positioned with respect to said dead center axis so that the approaching cylinder communicates with the associated port prior to the piston in the cylinder arriving at its dead center position, each of the port means in the said valve plate including a fishtail tapered groove leading the port means, a generally cylindrical aperture through said plate trailing and communicating with said tapered groove, and at least one separate elongated arcuate aperture through said plate trailing the cylindrical aperture.
Claim 17
Dependent Claim
210 words
A hydraulic pump, comprising: housing means having inlet and outlet ports therein, a cylinder block having cylinders therein and being rotatable relative to said housing means so that the cylinders serially communicate with said inlet and outlet ports, pistons slidable in said cylinders, cam means for reciprocating said pistons between bottom and top dead center positions, the positions of the pistons at said dead center positions defining a dead center axis substantially intersecting the axis of rotation of said cylinder block, a valve plate having low-pressure inlet port means and high-pressure outlet port means therein, at least one of said port means including means providing gradually increasing communication between the approaching cylinder and the associated port, said means providing gradually increasing communication between the approaching cylinder and the associated port being positioned with respect to said dead center axis so that the approaching cylinder communicates with the associated port prior to the piston in the cylinder arriving at its dead center position, each of the port means in the said valve plate including a fishtail tapered groove leading the port means, a generally cylindrical aperture through said plate trailing and communicating with said tapered groove, and at least one separate elongated arcuate aperture through said plate trailing the cylindrical aperture.
Claim 18
Dependent Claim
38 words
A hydraulic pump as defined in claim 8, wherein the tapered grooves are positioned so that the approaching cylinder communicates with the approached port when the center of the cylinder is substantially 4* behind the dead center axis.
Claim 19
Dependent Claim
28 words
A hydraulic pump as defined in claim 8 wherein the cylindrical aperture is positioned so that the approaching cylinders communicate therewith substantially 30* after the dead center axis.
Claim 20
Dependent Claim
29 words
A hydraulic pump as defined in claim 8 wherein said elongated arcuate aperture is positioned so that the approaching cylinder communicates therewith substantially 44* after the dead center axis.
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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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |