US3662548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid control system for vehicles
Assignee: Toyoda Koki KK
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Filing: 1970-06-01
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Granted: 1972-05-16
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Expires: 1990-06-01
Abstract
Abstract In a vehicle engine driven pump the output flow of the pump is increased in proportion to an increase in the engine speed. The increased output flow of the pump is regulated by a metering orifice and a control valve for bypassing a surplus quantity of the pump output flow to maintain the fluid volume downstream of the metering orifice at a predetermined constant volume. The constant volume downstream of the metering orifice is divided into two portions by means of a proportional distributing valve, one portion being supplied to a first pressure fluid actuated device through a check valve and the other portion to a second pressure fluid actuated device. An unloading valve and an accumulator are connected to the first pressure fluid actuated device to assure supply of the pressurized fluid under a constant pressure.
Inventors
- 👤 Akira Suzuki
- 👤 Tadataka Narumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:41
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/148; B60T13/142; B60T13/143; B60T13/144; B62; B62D; B62D5/00; B62D5/06; B62D5/07; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/2524
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
A fluid control system for a vehicle comprising a pump driven by an engine of said vehicle, a metering orifice connected to the output of said pump, a flow control valve means positioned across said metering orifice for bypassing a portion of the output flow of said pump to maintain the quantity of fluid downstream of said metering orifice at a substantially constant volume, a proportional distributing valve means located downstream of said flow control valve means for continuously dividing said constant volume of fluid into two passages at a predetermined ratio, a power steering device connected to one of said passages, a power braking device connected to the other of said passages, an accumulator positioned between said distributing valve means and said power braking device, a check valve means positioned upstream of said accumulator for preventing reverse flow of fluid from said accumulator to said distributing valve means, and unloading valve means positioned between said distributing valve means and said check valve means for bypassing the flow of fluid in said other passage in response to the pressure in said accumulator.
Claim 2
Dependent Claim
182 words
A fluid control system for a vehicle comprising a pump driven by an engine of said vehicle, a metering orifice connected to the output of said pump, a flow control valve means positioned across said metering orifice for bypassing a portion of the output flow of said pump to maintain the quantity of fluid downstream of said metering orifice at a substantially constant volume, a proportional distributing valve means located downstream of said flow control valve means for continuously dividing said constant volume of fluid into two passages at a predetermined ratio, a power steering device connected to one of said passages, a power braking device connected to the other of said passages, an accumulator positioned between said distributing valve means and said power braking device, a check valve means positioned upstream of said accumulator for preventing reverse flow of fluid from said accumulator to said distributing valve means, and unloading valve means positioned between said distributing valve means and said check valve means for bypassing the flow of fluid in said other passage in response to the pressure in said accumulator.
Claim 3
Dependent Claim
84 words
A fluid control system for a vehicle as claimed in claim 1, wherein said proportional distributing valve means comprises a housing; a spool slidably received in said housing, said spool having a chamber therein for receiving said constant quantity of fluid downstream of said metering orifice; a first orifice between said chamber and said power steering device; and a second orifice between said chamber and said power braking device, the effective areas of said first and second orifices being set at said predetermined ratio.
Claim 4
Dependent Claim
99 words
A fluid control system for a vehicle as claimed in claim 1, wherein said unloading valve means comprises a housing; a poppet valve means in said housing for bypassing, when opened, the flow from said distributing valve means; a first diaphragm clamped at the periphery thereof by said housing and engaging at the central portion thereof with said poppet valve means for controlling opening and closing of said poppet valve means; and a second diaphragm clamped at the periphery thereof by said housing for controlling the movement of said first diaphragm in response to the pressure in said accumulator.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |