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Multi-speed transmission having automatic and manual modes

A technology of manual mode and automatic mode, which is applied to vehicle gearboxes, components with teeth, multi-ratio transmissions, etc., and can solve problems such as engine braking

Inactive Publication Date: 2014-07-02
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a freewheeling one-way clutch decouples the driven member from the drive member, making engine braking impossible

Method used

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  • Multi-speed transmission having automatic and manual modes
  • Multi-speed transmission having automatic and manual modes
  • Multi-speed transmission having automatic and manual modes

Examples

Experimental program
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Embodiment Construction

[0083]The following description is merely exemplary in nature and is not intended to limit the invention, its application or uses.

[0084] At the outset, it should be appreciated that the eight speed automatic transmission of the present invention collectively has an arrangement of permanent mechanical connections between the elements of the four planetary gear sets. These mechanical connections are generally associated with, or related to, the transmission embodiment. A first component or element of a first planetary gear set is permanently coupled to a first component or element of a second planetary gear set. A second component or element of a second planetary gear set is permanently coupled to a second component or element of a third planetary gear set. A first component or element of a third planetary gear set is permanently coupled to a first component or element of a fourth planetary gear set. Finally, a second component or element of the first planetary gear set is ...

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Abstract

The present invention relates to a multi-speed transmission having automatic and manual modes. Specifically, a transmission is provided having: a stationary member; an input member; an output member; four planetary gear sets; a plurality of coupling members; and five torque transmitting devices. Each of the planetary gear sets includes first, second and third members. Five torque transmitting mechanisms are selectively engageable to interconnect one of the first, second and third members with the other of the first, second, third members and the stationary element. The torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member. The first of the five torque-transmitting mechanisms is a selectable one-way clutch engageable to interconnect the third member of the fourth planetary gear set with the stationary member.

Description

technical field [0001] The present invention relates to a multi-speed transmission having a plurality of planetary gear sets and selectively engageable torque-transmitting devices to achieve a plurality of gear ratios. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may or may not constitute prior art. [0003] Multi-speed transmissions use a combination of clutches, planetary gear arrangements, and fixed interconnections to achieve multiple gear ratios. In one example, friction clutches are used in a transmission and are selectively engaged to achieve a particular gear ratio. However, when disengaged, friction clutches tend to create drag (or drag) when there is relative motion between the input and output members of the clutch, which can result in reduced fuel economy. [0004] In an effort to improve fuel economy, a one-way clutch may be employed instead of a friction clutch to tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H3/66
CPCF16H3/66F16H2200/2041F16H2200/2012F16H2200/006
Inventor L.D.迪默F.萨米C.J.李D.W.赖特
Owner GM GLOBAL TECH OPERATIONS LLC