US3752282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch with plural fluid releasing means
Assignee: Robert Bosch GmbH
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Filing: 1972-02-01
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Granted: 1973-08-14
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Expires: 1992-02-01
Abstract
Abstract A clutch pedal is connected by a master cylinder and clutch cylinder through an operating valve with the clutch of a motor car so that the clutch can be disengaged and engaged by an operator before shifting the gear transmission. By operation of electromagnetic control valves, a source of pressure fluid can be connected with the operating valve to operate the same to supply pressure fluid to the clutch cylinder without operation of the clutch pedal. The control valves have another position in which the source of pressure fluid is disconnected while fluid is discharged through the control valves into a low pressure region by a spring-biased piston of the operating valve. The operating piston moves first rapidly, and then slowly while fluid is discharged from the operating cylinder through a throttle, and the clutch performs a corresponding movement first quickly and then slowly to the engaged position as required for shifting to a higher gear. Control means electrically control the electromagnetic control valve for automatic operation of the clutch during up and down shifting of the transmission.
Inventors
- 👤 H Espenshied
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:43
CPC Classifications
F; F16; F16D; F16D25/00; F16D25/12; F16D25/14; F16D48/00; F16D48/02; F16D48/04; F16D2048/0209; F16D2048/0221
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
218 words
Clutch control apparatus for a motor car, comprising, in combination, clutch means biased to an engaged position; a clutch cylinder and a clutch piston for moving said clutch means to a disengaged position; operator controlled clutch actuating means; a master cylinder and a master piston operable by said clutch actuating means; operating valve means including biased operating piston means, and operating cylinder means communicating with said master cylinder and said clutch cylinder so that upon operation of said master piston by said clutch actuating means said clutch piston operates said clutch means to move to said disengaged position; a source of pressure fluid; control valve means having a normal position disconnecting said source from said operating cylinder means and connecting the latter with a low pressure region, and a first control position connecting said source with said operating cylinder means so that said biased operating piston means rapidly presses fluid into said clutch cylinder for rapidly disengaging said clutch means; and control means for moving said control valve means to said first control position for disengaging said clutch means, and then to said normal position so that low pressure in said operating cylinder means permits said biased operating pistion to draw fluid from said clutch cylinder means so that said clutch means moves rapidly to said engaged position.
Claim 2
Dependent Claim
218 words
Clutch control apparatus for a motor car, comprising, in combination, clutch means biased to an engaged position; a clutch cylinder and a clutch piston for moving said clutch means to a disengaged position; operator controlled clutch actuating means; a master cylinder and a master piston operable by said clutch actuating means; operating valve means including biased operating piston means, and operating cylinder means communicating with said master cylinder and said clutch cylinder so that upon operation of said master piston by said clutch actuating means said clutch piston operates said clutch means to move to said disengaged position; a source of pressure fluid; control valve means having a normal position disconnecting said source from said operating cylinder means and connecting the latter with a low pressure region, and a first control position connecting said source with said operating cylinder means so that said biased operating piston means rapidly presses fluid into said clutch cylinder for rapidly disengaging said clutch means; and control means for moving said control valve means to said first control position for disengaging said clutch means, and then to said normal position so that low pressure in said operating cylinder means permits said biased operating pistion to draw fluid from said clutch cylinder means so that said clutch means moves rapidly to said engaged position.
Claim 3
Dependent Claim
79 words
Control apparatus as claimed in claim 1 comprising relief throttle means; wherein said control valve means have a second control position connecting said operating cylinder means with said relief throttle means so that said clutch means moves slowly to said engaged position; wherein said control means includes switch means operated by said operating piston means; wherein said control valve means include electromagnetic shifting means controlled by said switch means to shift said control valve means between said positions thereof.
Claim 4
Dependent Claim
99 words
Control apparatus as claimed in claim 2 wherein said control valve means includes a first control valve and a second control valve having normal positions disconnecting said source from said operating cylinder means and together connecting said operating cylinder means with said low pressure region; wherein said first control valve has a working position for connecting said source with said operating cylinder means; and wherein said second control valve has a working position for connecting said operating cylinder means with said relief throttle means; and wherein each of said first and second control valves has said electromagnetic shifting means.
Claim 5
Dependent Claim
69 words
Control apparatus as Claimed in claim 1 wherein said operating piston means includes two stepped operating pistons forming in said operating cylinder means first, second, and third pressure chambers; wherein said first pressure chamber communicates with said master cylinder; wherein said second pressure chamber is located between said two operating pistons and communicates with said control valve means; and wherein said third pressure chamber communicates with said clutch cylinder.
Claim 6
Dependent Claim
81 words
Control apparatus as claimed in claim 1 wherein said operating valve means includes a housing secured to one end of said operating cylinder means and forming with the same a control chamber into which a piston rod portion of one of said operating piston means projects; wherein said control valve means have electromagnetic shifting means; and wherein said control means include switch means for controlling said electromagnetic shifting means, located in said control chamber and actuated by said piston rod portion.
Claim 7
Dependent Claim
80 words
Control apparatus as claimed in claim 1 wherein control means include electronic means; and wherein said operator controlled clutch actuating means include a biased clutch pedal, for actuating said master piston so that fluid flowing through said operating cylinder means operates said clutch means, and a switch operated by said clutch pedal to disconnect said electronic means of said control means so that said control valve means are inoperative during operator controlled actuation of said clutch pedal and clutch means.
Claim 8
Dependent Claim
62 words
Control apparatus as claimed in claim 1 wherein said biased operating piston means include two operating pistons, and a spring means abutting said operating cylinder means and urging one of said operating pistons into abutment with the other operating piston for movement together when the pressure in said operating cylinder means is reduced in said normal position of said control valve means.
Claim 9
Dependent Claim
103 words
Control apparatus as claimed in claim 1 wherein said operating piston means includes two stepped operating pistons forming in said operating cylinder means first, second, and third pressure chambers; wherein said first pressure chamber communicates with said master cylinder; wherein said second pressure chamber is located between said two operating pistons and communicates with said control valve means; wherein said third pressure chamber communicated with said clutch cylinder; and wherein one of said operating pistons which is located between said first and second pressure chambers, includes a biased valve connecting said first and second pressure chambers and opening toward said first pressure chamber.
Claim 10
Dependent Claim
196 words
Control apparatus as claimed in claim 1 wherein said operating valve means includes a housing secured to one end of said operating cylinder means and forming with the same a control chamber into which a piston rod portion of one of said operating pistons projects; wherein said control valve means have electromagnetic shifting means; wherein said control means include switch means for controlling said electromagnetic shifting means, located in said control chamber and actuated by said piston rod portion; wherein said operating piston means includes two stepped operating pistons forming in said operating cylinder means first, second, and third pressure chambers; wherein said first pressure chamber connunicates with said master cylinder; wherein said second pressure chamber is located between said two operating pistons and communicates with said control valve means; wherein said third pressure chamber communicates with said clutch cylinder; and including a biased valve in a conduit passing through a transverse wall of said housing separating said third pressure chamber from said control chamber, said biased valve opening said conduit when one of said operating pistons moves away from said wall, and closing said conduit when said one operating piston is pressed against said wall.
Claim 11
Dependent Claim
50 words
control apparatus as claimed in claim 1 wherein said biased operating piston means incluDes an operating piston and a spring means biasing said operating piston to press fluid from said operating cylinder means into said master cylinder, and to draw fluid from said clutch cylinder into said operating cylinder means.
References Cited (Backward Citations)
US2753024A
Cited
US3292751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |