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Powertrain with torque converter and axially compact seven speed dual clutch transmission

By combining the hydraulic torque converter and dual friction shift clutch with synchronizer, the compact seven-speed transmission is designed to solve the high heat and axial length limitation problems of dual-clutch transmission, achieving efficient fuel economy and operating efficiency, and simplifying Improved cooling circuit and structural adaptability.

Inactive Publication Date: 2008-02-27
GM GLOBAL TECHNOLOGY OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, cooling circuits for friction shift clutches are often relatively complex due to the heat dissipation requirements of these large clutches
Finally, because layshaft or countershaft transmissions typically have multiple sets of axially aligned intermeshing gears, the overall axial length of countershaft transmissions can limit their use in some vehicle configurations

Method used

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  • Powertrain with torque converter and axially compact seven speed dual clutch transmission
  • Powertrain with torque converter and axially compact seven speed dual clutch transmission

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Embodiment Construction

[0010] Referring to the drawings, wherein like reference numerals indicate like or corresponding parts throughout the several views, there is shown in FIG. 1 a powertrain 10 for a vehicle (not shown). The powertrain 10 includes a power source or engine 14 , a torque converter 16 and a transmission 18 . The torque converter 16 includes a turbine section 20 , a pump section 22 and an stator section 24 . The engine output shaft 23 is connected for rotation with a hub member 25 which is connected to the pump portion 22 . Turbine section 20 is coupled with a transmission input member 26 . Thus, a hydraulic coupling between the pump portion 22 and the turbine portion 20 operably connects the engine 14 with the transmission input member 26 . The transmission input member 26 is preferably in the nature of a shaft. Selective engagement of torque converter clutch 28 allows engine 14 to be coupled directly to input member 26 , bypassing torque converter 16 . Preferably, the torque co...

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PUM

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Abstract

A powertrain having a torque converter, a friction input shift clutch, and a shared drive gear, and having an axially compact structure, encapsulating a transmission pump between the torque converter and a clutch hub and utilizing four back-to-back synchronized The engine achieves seven forward speed ratios.

Description

technical field [0001] The present invention relates to a powertrain having a power source, a torque converter and a compact seven-speed transmission with two friction shift clutches. Background technique [0002] Dual clutch transmissions (DCTs) have been designed with friction launch clutches that connect a vehicle power source, such as the engine, to the layshaft transmission. For dual clutch transmissions, their sporty, performance-biased nature is known. Dual clutch transmissions show good fuel economy due to good gear meshing efficiency and gear selection flexibility. Synchronizers are typically used to engage gears with an intermediate shaft to complete the flow of power from an engaged input clutch to an output shaft. The synchronizer has low spin loss; therefore, the overall operating efficiency is improved. However, dual clutch transmissions have some specific design considerations. For example, due to the high heat generated during slip, the shift clutch must ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/10F16H3/12
CPCF16H3/006F16H3/097F16H2003/0931F16H2200/0056Y10T74/19223Y10T74/19233Y10T74/19288
Inventor J·B·博格尔森S·P·费茨格拉尔德
Owner GM GLOBAL TECHNOLOGY OPERATIONS LLC
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