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Multi speed transmission

A technology of transmissions and components, applied in vehicle gearboxes, multi-ratio transmissions, transmissions, etc.

Inactive Publication Date: 2007-08-01
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like the six-speed transmission described above, seven-, eight-, and nine-speed transmissions have also been discontinued for reasons of complexity, size, and cost

Method used

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  • Multi speed transmission

Examples

Experimental program
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Embodiment Construction

[0012] Referring to FIG. 1 , there is schematically shown a transmission 10 for a vehicle. The transmission 10 includes a planetary gear set 14 and a compound gear set 16 . The planetary gear set 14 includes a sun gear member 18 , a ring gear member 22 and a planet carrier member 26 . The planet carrier member 26 rotatably supports planetary gear members 30 which mesh with the ring gear member 22 and the sun gear member 18 .

[0013] Compound gear set 16 includes sun gear member 34 , sun gear member 38 , ring gear member 42 , ring gear member 46 and planet carrier member 50 . The planet carrier member 50 rotatably supports a planetary gear member 54 and a planetary gear member 58 . Planetary gear members 54 mesh with sun gear member 38 and ring gear member 46 . Planetary gear members 58 mesh with sun gear member 34 , ring gear member 42 and planetary gear members 54 . Compound gear set 16 is a Ravigneaux gear set in which long gear 54 does not belong to the same kinematic ...

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Abstract

A transmission is provided having a planetary gearset having respective first, second, and third members, and a compound gearset having respective first, second, third, fourth, and fifth members. The transmission also includes a plurality of selectively engageable torque transmitting devices configured to selectively interconnect selected members of the planetary gearset and the compound gearset for unitary rotation thereby to provide a plurality of forward speed ratios and at least one reverse speed ratio between an input member and an output member.

Description

technical field [0001] The present invention relates to a power transmission having a planetary gear arrangement and a Ravigneaux-style gear arrangement. Background technique [0002] A passenger car includes a powertrain that includes an engine, a multi-speed transmission, and a differential or final drive. A multi-speed transmission can increase the overall operating range of a vehicle by allowing the engine to operate multiple times through its torque range. The number of forward speed ratios available in the transmission determines the number of iterations of the engine torque range. Early automatic transmissions had two speed ranges. This severely limits the overall speed range of the vehicle, thus requiring a relatively large engine capable of producing a wide range of speeds and torques. This makes the engine work at a specific point of fuel consumption during operation, rather than at the point of best efficiency. Therefore, manual transmissions (countershaft tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/44
CPCF16H2200/2007F16H2200/2048F16H3/663F16H2200/0056F16H2200/2025
Inventor M·林H·施赖伯
Owner GM GLOBAL TECH OPERATIONS LLC
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