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Multi-speed transmission with automatic and manual modes

A technology of transmission and speed ratio, which is applied in vehicle gearboxes, components with teeth, multi-ratio transmissions, etc., and can solve problems such as engine braking

Inactive Publication Date: 2015-11-25
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 with automatic and manual modes
  • Multi-speed transmission with automatic and manual modes
  • Multi-speed transmission with automatic and manual modes

Examples

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Embodiment Construction

[0071] The following description is merely exemplary in nature and is not intended to limit the invention, its application, or uses.

[0072] At the outset, it should be appreciated that in the particular example provided, the eight-speed automatic transmission of the present invention has an arrangement of permanent mechanical connections between the elements of the four planetary gear sets. These mechanical linkages generally relate to, or relate to, embodiments of the transmission. More specifically, the first member or element of the first planetary gear set is permanently coupled to the first member or element of the second planetary gear set. The second member or element of the first planetary gear set is permanently coupled to the third member or element of the fourth planetary gear set. The third member or element of the second planetary gear set is permanently coupled to the third member or element of the third planetary gear set. The second member or element of the...

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Abstract

A transmission is disclosed having an input member, an output member, and first, second, third and fourth planetary gear sets each having first, second and third members. A plurality of interconnecting members continuously interconnect one of the first, second and third members of one of the planetary gear sets with one of the first, second and third members of another of the planetary gear sets. Five 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 first planetary gear set with the stationary member.

Description

technical field [0001] The present invention relates to a multi-speed transmission having multiple planetary gear sets and selectively engageable torque-transmitting devices to achieve multiple gear ratios in automatic and manual modes. 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 interconnects to achieve multiple gear ratios. In one example, friction clutches are used in transmissions and are selectively engaged to achieve specific gear ratios. 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 used in place of a friction clutch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H3/62
CPCF16H3/66F16H2200/006F16H2200/2012F16H2200/2041
Inventor L.D.迪默F.萨米D.W.赖特C.J.李
Owner GM GLOBAL TECH OPERATIONS LLC