Method for shifting a twin-clutch transmission and twin-clutch transmission arrangement

• US 5,950,781 A
• Filed: 10/27/1998
• Issued: 09/14/1999
• Est. Priority Date: 08/08/1996
• Status: Expired due to Term

• Current Assignee: Volkswagen AG
• Original Assignee: Volkswagen AG
• Inventors: Damm, Ansgar, Cappelmann, Bernd, Adamis, Panagiotis, Ludanek, Harald, Haack, Reinhold
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): RODRIGUEZ, SAUL
• Application Number:
  US09/181,016
• Time in Patent Office: 322 Days
• Field of Search: 74/325, 74/331, 74/333, 74/330, 192/3.58, 192/3.61, 192/48.7, 192/48.8
• US Class Current: 192/3.61
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 10/113 with two input flow paths, e.g. double clutch transmission selection of one of the torque flow paths by the corresponding input clutch
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: F16H 2061/0425 Bridging torque interruption
• CPC Class Codes: F16H 2200/0052 the gear ratios comprising six forward speeds
• CPC Class Codes: F16H 2306/14 Skipping gear shift
• CPC Class Codes: F16H 2306/44 Removing torque from current gears
• CPC Class Codes: F16H 2306/48 Synchronising of new gear
• CPC Class Codes: F16H 2306/52 Applying torque to new gears
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/089 all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved
• CPC Class Codes: F16H 61/0403 Synchronisation before shifting
• CPC Class Codes: F16H 61/688 with two inputs, e.g. selection of one of two torque-flow paths by clutches
• CPC Class Codes: F16H 63/46 Signals to a clutch outside the gearbox
• CPC Class Codes: Y10T 74/19056 Parallel
• CPC Class Codes: Y10T 74/19228 Multiple concentric clutch shafts
• CPC Class Codes: Y10T 74/19233 Plurality of counter shafts

Abstract

A twin-clutch transmission having the driving gear wheels of adjacent gears on different transmission input shafts permits skipping one gear stage while shifting gears, i.e. shifting between gears whose driving gear wheels are on the same transmission input shaft, by using an auxiliary gear on the other transmission input shaft to supply a filler torque while shifting between the initial gear and a selected gear.

Claims

1. A twin-clutch transmission comprising a first transmission input shaft carrying an originally engaged gear and a selected gear to be engaged after shifting, a second transmission input shaft carrying an auxiliary gear having a higher gear ratio than either the originally engaged gear or the selected gear to be engaged after shifting, each transmission input shaft having an associated clutch, and a transmission output shaft, wherein the driving gear wheels of at least three transmission gears are on the first transmission input shaft and the driving gear wheels of only two transmission gears are on the second transmission input shaft.

2. A twin-clutch transmission according to claim 1 having six transmission gears with six gear wheel pairs and wherein the driving gear wheels of the first, third, fourth and fifth transmission gears are on the first transmission input shaft and the driving gear wheels of the second and sixth transmission gears are on the second transmission input shaft.