Patent US3845992A successfully refreshed from Google Patents.
US3845992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pressure control apparatus
Assignee: Aisin Corp
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Filing: 1973-03-06
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Granted: 1974-11-05
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Expires: 1993-03-06
Abstract
Abstract A hydraulic pressure control apparatus comprising a servo-valve having an input of a fluid-pressure from a master cylinder proportional to the force applied to a pedal and an output of fluid pressure applied to an actuator with passages from an accumulator to the actuator and from the actuator to a drain, characterized in that the input and the output are opposed to act on a piston therebetween in the valve, the piston having a pressure line formed at the input and the output sides respectively, the pressure lines being functionally connected to an electrical signal assembly so that when the signal assembly is actuated, the pressure varies to activate the piston so as to control the output, thereby modifying the working condition of the actuator to the ideal operation thereof.
Inventors
- 👤 K Takayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:26
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/363; B60T8/365; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/3655; B60T8/366; B60T8/367; B60T8/42; B60T8/4208; B60T8/4225; B60T8/44; B60T8/447
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
351 words
An apparatus for controlling the hydraulic pressure in a control system for controlling a vehicle comprising a first source of fluid under pressure responsive to the operation of a pedal, a second source of fluid under pressure, an actuator means responsive to fluid pressure for controlling the vehicle, an electrically operated signal means responsive to the rotational state of a vehicle wheel for varying the fluid pressure on said actuator means, and a servo valve, said servo valve comprising, a cylinder housing having closed end walls, a piston slidably fitted within said cylinder housing and having an opposed opening at each end thereof, a pair of longitudinal members, one end of each member being mounted in each opposed opening in said piston, and the other ends of said members being affixed to the closed ends of said cylinder housing, the inner ends of said longitudinal members being spaced from the inner ends of the opposed openings in said piston to form two compartments, a first passageway for connecting one of the compartments to said first source of fluid under pressure, a second passageway for connecting the other compartment to said actuator means, a third passageway for connecting the other compartment to a drain, said third passageway being closed to the drain when fluid pressure is applied from said first source through said first passageway to move said piston and to open said second passageway to actuate said actuator means by fluid pressure, a fourth passageway for connecting the other compartment to said second source of fluid under pressure, the opposed outer ends of said piston being spaced from the closed ends of said cylinder housing to form opposed chambers, said chambers being connected to said second source of fluid pressure and to said electrically operated signal means, said signal means including means to vary the fluid pressure in said chambers in accordance with the state of rotation of the wheel of the vehicle to increase or decrease the fluid pressure in the other compartment by varying the movement of said piston and thus vary the pressure applied to said actuator means.
Claim 2
Independent Claim
351 words
An apparatus for controlling the hydraulic pressure in a control system for controlling a vehicle comprising a first source of fluid under pressure responsive to the operation of a pedal, a second source of fluid under pressure, an actuator means responsive to fluid pressure for controlling the vehicle, an electrically operated signal means responsive to the rotational state of a vehicle wheel for varying the fluid pressure on said actuator means, and a servo valve, said servo valve comprising, a cylinder housing having closed end walls, a piston slidably fitted within said cylinder housing and having an opposed opening at each end thereof, a pair of longitudinal members, one end of each member being mounted in each opposed opening in said piston, and the other ends of said members being affixed to the closed ends of said cylinder housing, the inner ends of said longitudinal members being spaced from the inner ends of the opposed openings in said piston to form two compartments, a first passageway for connecting one of the compartments to said first source of fluid under pressure, a second passageway for connecting the other compartment to said actuator means, a third passageway for connecting the other compartment to a drain, said third passageway being closed to the drain when fluid pressure is applied from said first source through said first passageway to move said piston and to open said second passageway to actuate said actuator means by fluid pressure, a fourth passageway for connecting the other compartment to said second source of fluid under pressure, the opposed outer ends of said piston being spaced from the closed ends of said cylinder housing to form opposed chambers, said chambers being connected to said second source of fluid pressure and to said electrically operated signal means, said signal means including means to vary the fluid pressure in said chambers in accordance with the state of rotation of the wheel of the vehicle to increase or decrease the fluid pressure in the other compartment by varying the movement of said piston and thus vary the pressure applied to said actuator means.
Claim 3
Dependent Claim
55 words
An apparatus as claimed in claim 1 and further comprising a check valve disposed in said fourth passageway so that when said piston moves to connect said first passageway to said actuator means through said second and fourth passageways, said actuator means can be operated even when said seconD source of fluid under pressure fails.
Claim 4
Dependent Claim
32 words
An apparatus as claimed in claim 1 and further comprising passageways for connecting said chambers to said second source of fluid under pressure and orifice means disposed in said last mentioned passageways.
Claim 5
Dependent Claim
28 words
An apparatus as claimed in claim 1 wherein said signal means includes a flapper valve actuated by said signal means for controlling the respective pressures in said chambers.
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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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |