US4747614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cylinder mechanism
Assignee: Denso Corp
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Filing: 1987-03-12
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Granted: 1988-05-31
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Expires: 2007-03-12
Abstract
Abstract The hydraulic cylinder mechanism has a main piston which has a piston portion, two sub-pistons which is so located that the sub-pistons can hold the piston portion, control pressure chambers which are formed between the sub-piston and the piston portion, and holding pressure chambers which are formed at behind of the sub-piston. The hydraulic cylinder mechanism controls automotive rear wheel alignment when the main piston moves axially according to the pressure in the control pressure chambers and can maintain its neutral position when the pressure in the holding chamber is applied to the sub-piston so that holds the piston portion.
Inventors
- 👤 Masatoshi Kuroyanagi
- 👤 Kazuma Matsui
- 👤 Youzou Majima
- 👤 Fumiaki Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:03
CPC Classifications
B; B60; B60G; B60G7/00; B60G7/02; B60G7/001; B60G7/003; B60G7/006; B62; B62D; B62D17/00; B60G2200/00; B60G2200/10; B60G2200/14; B60G2200/142; B60G2200/144; B60G2200/1442; B60G2200/40; B60G2200/46; B60G2200/462; B60G2200/4622; B60G2202/00; B60G2202/40; B60G2202/41; B60G2202/413; B60G2204/00; B60G2204/10; B60G2204/14; B60G2204/143; B60G2204/40; B60G2204/42; B60G2204/61; B60G2204/62; B60G2206/00; B60G2206/01; B60G2206/10; B60G2206/11; B60G2206/111
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A hydraulic cylinder mechanism for controlling the displacement of swing means which swingably supports an automotive wheel to an automotive body in order to control wheel alignment comprising: a cylinder member connected to one of said body and said wheel; a main piston arranged slidably in said cylinder member and connected to another one of said body and said wheel; a piston portion formed in said main piston and made movable together with said main piston; two cylindrical sub-pistons surrounding said main piston and clamping said piston portion from both sides of said piston portion in said cylinder member; control pressure chambers formed between said sub-pistons and said piston portion so that said piston portion is driven in accordance with the pressure in said control pressure chambers; and holding pressure chambers formed at back of said sub-pistons so that said piston portion is held in a predetermined position by the pressure in said holding pressure chambers.
Claim 2
Dependent Claim
156 words
A hydraulic cylinder mechanism for controlling the displacement of swing means which swingably supports an automotive wheel to an automotive body in order to control wheel alignment comprising: a cylinder member connected to one of said body and said wheel; a main piston arranged slidably in said cylinder member and connected to another one of said body and said wheel; a piston portion formed in said main piston and made movable together with said main piston; two cylindrical sub-pistons surrounding said main piston and clamping said piston portion from both sides of said piston portion in said cylinder member; control pressure chambers formed between said sub-pistons and said piston portion so that said piston portion is driven in accordance with the pressure in said control pressure chambers; and holding pressure chambers formed at back of said sub-pistons so that said piston portion is held in a predetermined position by the pressure in said holding pressure chambers.
Claim 3
Dependent Claim
33 words
A hydraulic cylinder mechanism according to claim 1, wherein said swing means includes an arm portion arranged between said wheel and said automotive body and displaces the whole length of said arm portion.
Claim 4
Dependent Claim
36 words
A hydraulic cylinder mechanism according to claim 1, wherein said swing means includes an arm portion arranged between said wheel and said automotive body and displaces a connected position of said arm portion and said body.
Claim 5
Dependent Claim
53 words
A hydraulic cylinder mechanism according to claim 1, further comprising an electromagnetic valve for switching and controlling the control oil pressures supplied to both the first control pressure chamber formed between one of said sub-piston and said piston portion and the second control pressure chamber formed between the other sub-piston and piston portion.
Claim 6
Dependent Claim
53 words
A hydraulic cylinder mechanism according to claim 1, wherein the receiving areas of said control pressure chambers to which the control pressure is applied in order to move said main piston are larger than those of the holding pressure chambers to which the control pressure is applied in order to move said sub-piston.
References Cited (Backward Citations)
US3498630A
Cited
JPS60138815A
Cited
JPS60146708A
Cited
JPS60166566A
Cited
US4601357A
Cited
US4669567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |