Patent US3738460A successfully refreshed from Google Patents.
US3738460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic released clutch controlled by engine speed and shift switches
Assignee: Aisin Corp
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Filing: 1971-06-15
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Granted: 1973-06-12
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Expires: 1991-06-15
Abstract
Abstract Disclosed herein is an automatic control system of a friction disc clutch for vehicles, which comprises a source of fluid pressure, hydraulic servo means for disengaging the clutch, solenoid operated regulating valve means for controlling fluid pressure supplied to the servo means from the pressure source, an electronic control system for regulating the valve means in response to the rotation speed of the vehicle engine, and means for expediting discharge of fluid pressure from the servo means after completion of drive power train shifting operation thereby to realize quick and smooth clutching operation. As engine speed increases above idling, the control system gradually reduces current to the solenoid valve so that it gradually opens a servo exhaust port thereby permitting the clutch to be gradually engaged by springs.
Inventors
- 👤 N Murakami
- 👤 K Nishida
- 👤 N Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:30
CPC Classifications
F; F16; F16D; F16D48/00; F16D48/06; F16D48/066; F16D2500/00; F16D2500/10; F16D2500/104; F16D2500/10406; F16D2500/10412; F16D2500/10443; F16D2500/1045; F16D2500/30; F16D2500/306; F16D2500/3067; F16D2500/50; F16D2500/502; F16D2500/50239; F16D2500/52; F16D2500/525; F16D2500/70; F16D2500/704; F16D2500/70402; F16D2500/70418; F16D2500/71; F16D2500/7105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
230 words
An automatic control system of a friction disc clutch for a vehicle comprising an engine, a drive power train, a source of fluid pressure, hydraulic servo means for engaging and disengaging said clutch, fluid pressure regulating valve means for controlling fluid pressure supplied to said servo means from said pressure source, solenoid means for regulating operation of said valve means, said system comprising, current control means for keeping current supplied to said solenoid means at a predetermined high value while said engine of said vehiclE is conditioned to its idling rotation, for decreasing said current gradually down to a predetermined low value in accordance with increase of said engine rotation, for cutting off said current when said engine rotation reaches up a preset high value, and for increasing said current up to said predetermined high value upon shifting operation of said drive power train of said vehicle, thereby to engage said clutch when said engine rotation reaches and exceeds a certain preset number and to disengage said clutch when said engine is conditioned to its idling rotation and when drive power train is shifted, blocking means for preventing fluid pressure being supplied to said servo means for a predetermined short period of time after the engine rotation exceeds its idling rotation, and switching means for controlling operation of said blocking means in accordance with operation of said current control means.
Claim 2
Dependent Claim
230 words
An automatic control system of a friction disc clutch for a vehicle comprising an engine, a drive power train, a source of fluid pressure, hydraulic servo means for engaging and disengaging said clutch, fluid pressure regulating valve means for controlling fluid pressure supplied to said servo means from said pressure source, solenoid means for regulating operation of said valve means, said system comprising, current control means for keeping current supplied to said solenoid means at a predetermined high value while said engine of said vehiclE is conditioned to its idling rotation, for decreasing said current gradually down to a predetermined low value in accordance with increase of said engine rotation, for cutting off said current when said engine rotation reaches up a preset high value, and for increasing said current up to said predetermined high value upon shifting operation of said drive power train of said vehicle, thereby to engage said clutch when said engine rotation reaches and exceeds a certain preset number and to disengage said clutch when said engine is conditioned to its idling rotation and when drive power train is shifted, blocking means for preventing fluid pressure being supplied to said servo means for a predetermined short period of time after the engine rotation exceeds its idling rotation, and switching means for controlling operation of said blocking means in accordance with operation of said current control means.
Claim 3
Dependent Claim
112 words
An automatic control system as claimed in claim 1, wherein said current control means comprises an electric source, an engine rotation detecting circuit for detecting the rotation number of said engine as sine waves, a converter circuit for converting said sine waves to pulse signals and further to analogue voltage, a current control circuit for controlling said current supplied to said solenoid means in response to the value of said analogue voltage, a switch control circuit for controlling said switching means in response to the value of said analogue voltage, and a switching circuit for connecting said electric source to said solenoid means either directly or indirectly through said current control circuit.
Claim 4
Dependent Claim
38 words
An automatic control system as claimed in claim 2, wherein said switching means comprises a monostable multi-vibrator regulated by said switch control circuit, and a transistor conducted by said monostable multi-vibrator to control operation of said blocking means.
Claim 5
Dependent Claim
27 words
An automatic control system as claimed in claim 1, wherein said blocking means comprises an electromagnetic cut-off valve interposed between said pressure source and said servo means.
Claim 6
Dependent Claim
56 words
An automatic control system as claimed in claim 1, wherein said switching means comprises a relay controlled by said current control means, on-off switch means operated by said relay, a monostable multi-vibrator driven by turning-on operation of said switch means, and a transistor regulated by said monostable multi-vibrator and controlling current supply to said cut-off valve.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |