Patent EP0050944A2 successfully refreshed from Google Patents.
EP0050944A2
Expired / Lapsed
EP
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Control means for rotary power transmission
Assignee: Whitnash PLC
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Filing: 1981-10-16
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Granted: —
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Expires: 2001-10-16
Abstract
Abstract A rotary powertransmission having a series of geartrains and two clutches alternately engageable to provide drive paths through the gear trains in series sequence has control means including a fluid pressure source and three solenoid-operated valves (A,B,C) to direct source fluid to two spool valves (51,52) which provide discrete fluid pressure signals for engagement of gear trains two at a time in progressively overlapping pairs, the gear trains being for eventual drive according to clutch engagement.
Inventors
- 👤 John Young Alastair
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 08:20
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0206; F16H61/0262; F16H61/0276; F16H2061/0288; F16H2200/00; F16H2200/003; F16H2200/0047; F16H2306/00; F16H3/00; F16H3/006; F16H61/68; F16H61/684; F16H61/688; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926; Y10T74/19274
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
Control means for a rotary power transmission of the dual clutch kind having a neutral speed ratio, reverse speed ratio and not more than five forward speed ratios, and comprising a fluid pressure source, three solenoid-operated valves (A,B,C) selectively energisable to direct fluid under pressure from said source to two single spool valves (51,52), the spools of said valves being responsive to provide discrete fluid pressure signals for controlling selection of the transmission speed ratios, for eventual drive according to clutch engagement, the arrangement being such that the spool valves (51,52) can select forward speed ratios two at a time in progressively overlapping pairs.
Claim 2
Dependent Claim
104 words
Control means for a rotary power transmission of the dual clutch kind having a neutral speed ratio, reverse speed ratio and not more than five forward speed ratios, and comprising a fluid pressure source, three solenoid-operated valves (A,B,C) selectively energisable to direct fluid under pressure from said source to two single spool valves (51,52), the spools of said valves being responsive to provide discrete fluid pressure signals for controlling selection of the transmission speed ratios, for eventual drive according to clutch engagement, the arrangement being such that the spool valves (51,52) can select forward speed ratios two at a time in progressively overlapping pairs.
Claim 3
Dependent Claim
38 words
Control means accoreing to Claim 1, characterised thereby that at least one of the solenoid-operated valves (A,B,C) is a pilot valve which controls only the position of the spool of a spool valve responsive to said solenoid-operated valves.
Claim 4
Dependent Claim
36 words
Control means according to Claim 2, characterised thereby that the three solenoid-operated valves (A,B,C) are each pilot valves which, for the forward speed ratios, control only the position of the spools of said spool valves (51,52).
Claim 5
Dependent Claim
23 words
Control means according to Claim 1, characterised thereby that a discrete fluid pressure signal is provided for the highest forward speed ratio only.
Claim 6
Dependent Claim
30 words
Control means according to Claim 1, characterised thereby reverse speed ratio is engaged by a fluid pressure actuator responsive to fluid pressure directed from one of said solenoid valves (A,B,C).
Claim 7
Dependent Claim
25 words
Control means according to Claim 5, characterised thereby that fluid pressure is directed to said actuator through a passage in one of said spool valves.
References Cited (Backward Citations)
No citation records indexed.
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