Patent US3632230A successfully refreshed from Google Patents.
US3632230A
Expired / Lapsed
US
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Hydraulic intensifier
Assignee: Aisin Corp
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Filing: 1970-10-16
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Granted: 1972-01-04
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Expires: 1990-10-16
Abstract
Abstract A hydraulic intensifier interposed between an accumulator and a source of pressure fluid including a hydraulic pump, comprising a housing with small and large diameter cylindrical bores therein, a small diameter piston reciprocatably engaged in the small diameter cylindrical bore to form a pressure chamber for amplifying fluid pressure from the source of pressure fluid, a large diameter piston reciprocatably engaged in the large diameter cylindrical bore to operate the small diameter piston, and a control valve means incorporated within the large diameter piston to control reciprocation of the large diameter piston, thereby, easy assembling work is realizable with a small number of parts and accurate operation of the device is obtainable, and above all, the time necessary to charge the accumulator with fluid pressure can much be reduced.
Inventors
- 👤 Atsum Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:01
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F01; F01L; F01L21/00; F01L25/00; F01L25/02; F01L25/04; F01L25/06; F01L25/066; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/164; F04B9/00; F04B9/08; F04B9/10; F04B9/103; F04B9/107; F15B3/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
344 words
In a hydraulic intensifier; a housing having therein a stepped-diameter cylindrical bore forming a small diameter bore portion connected to a first inlet conduit to receive fluid pressure from a source of fluid pressure and and outlet conduit to charge fluid pressure to an accumulator and a large diameter bore portion connected to a second inlet conduit to receive fluid pressure from the source of fluid pressure, said housing also including an exhaust conduit communicating with said large diameter bore portion, a stepped piston comprising a small diameter piston portion reciprocable within said small diameter bore portion to form a first pressure chamber for amplifying the fluid pressure supplied to said outlet conduit from said first inlet conduit and a large diameter piston portion reciprocatably engaged in said large diameter bore portion to form a second pressure chamber selectively in communication with said second inlet conduit and an exhaust chamber connected to said exhaust conduit, said large diameter piston portion including a bore drilled therein along the axial center thereof, a control valve means reciprocatably engaged in said bore within said large piston portion, a third pressure chamber formed between said control valve means and said last named bore, an inlet-outlet port connecting said third pressure chamber alternately to said second inlet conduit and said exhaust chamber, a first passageway to communicate said second pressure chamber with said second inlet conduit, and a second passageway to connect said second pressure chamber with said exhaust chamber, said control valve means operating to close said second passageway and open said first passageway when the fluid pressure supplied to said third pressure chamber through said second inlet conduit and said inlet-outlet port reaches a predetermined value, the operation causing the fluid pressure within said second pressure chamber acting on said large diameter piston portion to urge said small diameter piston portion to amplify the fluid pressure within said first pressure chamber, and said control valve means continuously operating to open said second passageway after connecting said third pressure chamber to said exhaust chamber through said inlet-outlet port.
Claim 2
Dependent Claim
344 words
In a hydraulic intensifier; a housing having therein a stepped-diameter cylindrical bore forming a small diameter bore portion connected to a first inlet conduit to receive fluid pressure from a source of fluid pressure and and outlet conduit to charge fluid pressure to an accumulator and a large diameter bore portion connected to a second inlet conduit to receive fluid pressure from the source of fluid pressure, said housing also including an exhaust conduit communicating with said large diameter bore portion, a stepped piston comprising a small diameter piston portion reciprocable within said small diameter bore portion to form a first pressure chamber for amplifying the fluid pressure supplied to said outlet conduit from said first inlet conduit and a large diameter piston portion reciprocatably engaged in said large diameter bore portion to form a second pressure chamber selectively in communication with said second inlet conduit and an exhaust chamber connected to said exhaust conduit, said large diameter piston portion including a bore drilled therein along the axial center thereof, a control valve means reciprocatably engaged in said bore within said large piston portion, a third pressure chamber formed between said control valve means and said last named bore, an inlet-outlet port connecting said third pressure chamber alternately to said second inlet conduit and said exhaust chamber, a first passageway to communicate said second pressure chamber with said second inlet conduit, and a second passageway to connect said second pressure chamber with said exhaust chamber, said control valve means operating to close said second passageway and open said first passageway when the fluid pressure supplied to said third pressure chamber through said second inlet conduit and said inlet-outlet port reaches a predetermined value, the operation causing the fluid pressure within said second pressure chamber acting on said large diameter piston portion to urge said small diameter piston portion to amplify the fluid pressure within said first pressure chamber, and said control valve means continuously operating to open said second passageway after connecting said third pressure chamber to said exhaust chamber through said inlet-outlet port.
Claim 3
Dependent Claim
31 words
A hydraulic intensifier as set forth in claim 1, wherein said stepped piston is an integral piston having the small diameter piston portion and the large diameter piston portion formed therein.
Claim 4
Dependent Claim
37 words
A hydraulic intensifier as set forth in claim 1, wherein said stepped piston comprises a small diameter piston and a separate large diameter piston, said small and large diameter pistons being in constant contact with each other.
Claim 5
Dependent Claim
48 words
A hydraulic intensifier as set forth in claim 1, wherein said large diameter piston has a cylinder-shaped shock absorbing member made of resilient material at one end thereof, said cylinder-shaped shock absorbing member being provided with an orifice communicable with said second pressure chamber around the circumference thereof.
Claim 6
Dependent Claim
47 words
A hydraulic intensifier as set forth in claim 1, wherein there is provided at the sides of said large diameter piston an inlet port connecting said second inlet conduit to said third pressure chamber and an exhaust port connecting said exhaust chamber to said third pressure chamber.
References Cited (Backward Citations)
US2539292A
Cited
US2864313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |