Patent EP0003408B1 successfully refreshed from Google Patents.
EP0003408B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Continuously variable transmission mechanisms
Assignee: PIV Antrieb Werner Reimers GmbH and Co KG
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Filing: 1979-01-17
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Granted: 1981-12-30
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Expires: 1999-01-17
Abstract
No abstract record available.
Inventors
- 👤 Randle Leslie Abbott
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:30
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/021; F16H37/022
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
194 words
A continuously variable transmission mechanism comprising a variator (10) having input and output sheaves (11 and 12) of variable diameters and a flexible band (13) connecting the sheave together, an epicyclic gearset incorporated in the mechanism and clutches and/or brakes (17, 28, 29, 25 and 27) or (17, 52, 55 and 56) arranged for selectively coupling together or selectively holding stationary various parts of the transmission mechanism to provide forward and reverse transmission ranges, characterised by a configuration of the transmission such that the variator input sheave (11) at the input to the transmission is co-axial with the transmission output shaft (16) and can be clutched to the output shaft (clutch 17), that the epicyclic gearset is driven by the variator output sheave (12), that the output from the epicyclic gearset is connected to the transmission output shaft through a reduction drive (22, 23, 24) and clutches and/or brakes (28, 29, 25 and 26) or (52, 55 and 56) control the epicyclic gearset to selectively provide a reduction forward drive, a direct drive with the gearset locked up and a reverse drive between the variator output sheave and the output of the epicyclic gearset.
Claim 2
Dependent Claim
194 words
A continuously variable transmission mechanism comprising a variator (10) having input and output sheaves (11 and 12) of variable diameters and a flexible band (13) connecting the sheave together, an epicyclic gearset incorporated in the mechanism and clutches and/or brakes (17, 28, 29, 25 and 27) or (17, 52, 55 and 56) arranged for selectively coupling together or selectively holding stationary various parts of the transmission mechanism to provide forward and reverse transmission ranges, characterised by a configuration of the transmission such that the variator input sheave (11) at the input to the transmission is co-axial with the transmission output shaft (16) and can be clutched to the output shaft (clutch 17), that the epicyclic gearset is driven by the variator output sheave (12), that the output from the epicyclic gearset is connected to the transmission output shaft through a reduction drive (22, 23, 24) and clutches and/or brakes (28, 29, 25 and 26) or (52, 55 and 56) control the epicyclic gearset to selectively provide a reduction forward drive, a direct drive with the gearset locked up and a reverse drive between the variator output sheave and the output of the epicyclic gearset.
Claim 3
Dependent Claim
23 words
A transmission mechanism as claimed in Claim 1, characterised in that the epicyclic gearset is co-axial with the output sheave of the variator.
Claim 4
Dependent Claim
33 words
A transmission mechanism as claimed in Claim 1 or Claim 2 characterised in that the reduction ratio of the reduction drive (22, 23, 24) is the inverse of the maximum usable variator ratio.
Claim 5
Dependent Claim
21 words
A transmission mechanism as claimed in any preceding claim including a fluid coupling (31) at the input to the transmission mechanism.
Claim 6
Dependent Claim
132 words
A transmission mechanism as claimed in any preceding claim characterised in that the epicyclic gearset is in the form of a simple gearset (Figure 1) with sun gear (18), planet gears on a planet carrier (19) and an annulus (20), with the output sheave driving the sun gear; the planet carrier can be clutched (clutch 28) to the output (21) of the epicyclic gearset and the annulus braked to rest (brake 27) to provide a reduction drive; the carrier can be braked to rest (brake 25) and the annulus clutched to the output (clutch 29) of the gearset to provide reverse and the carrier and annulus can be clutched (clutches 28 and 29) to the output of the epicyclic gearset to lock up the gearset and provide direct drive through the gearset.
Claim 7
Dependent Claim
138 words
A transmission mechanism as claimed in any one of Claims 1 to 4 characterised in that the epicyclic gearset has two sun gears (42, 46) coupled together, each with its own planet carrier (43, 47), planets (44, 48) and annulus (45, 49) with the first annulus permanently connected to the second carrier and forming the output of the epicyclic gearset; the second annulus is then clutched (clutch 55) to the variator output sheave and the first carrier is braked to rest (brake 56) to provide a reduction drive; the two sun gears are clutched to the variator output (clutch 52) and the first carrier is braked (brake 56) to provide reverse drive and the sun gear and second annulus are clutched to the variator output (clutches 52 and 55) to lock up the transmission and provide direct drive.
References Cited (Backward Citations)
No citation records indexed.
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