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Eight speed planetary kinematic arrangement

A technology of planetary gears and planetary gear sets, applied in the field of dynamic arrangement of clutches, transmissions, interconnections and brakes, can solve the problems of failure rate hindering, hindering the development of multi-speed power transmission, high size and cost

Inactive Publication Date: 2014-07-30
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Development of seven-speed, eight-speed transmissions, or existing multi-speed drivetrains, has been hampered by complexity, size and expense, and high failure rates

Method used

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  • Eight speed planetary kinematic arrangement
  • Eight speed planetary kinematic arrangement
  • Eight speed planetary kinematic arrangement

Examples

Experimental program
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Embodiment Construction

[0045] figure 1 Shown is a transmission according to the invention. The engine of the vehicle preferably drives the input shaft 10 through a torsional damper that absorbs combustion pulses. The output shaft 12 preferably drives the wheels through the drive shaft, differential assembly and rear axle shaft. The gearbox 14 is used to support gear sets, shafts, clutches and brakes.

[0046] The transmission consists of four simple planetary gearset assemblies 20, 30, 40 and 50. Each simple planetary gear set assembly has a sun gear, a ring gear meshing with an internal gear, a planet carrier, and a set of planet gears supported for rotation on the planet carrier and meshing with both the sun gear and the ring gear. figure 2 The recommended number of gear teeth for each of these gears is shown.

[0047] Input shaft 10 drives sun gear 52 and planet carrier 46 . Ring gear 54 drives output shaft 12 . The planet carrier 26 is connected to the planet carrier 56 , the ring gear 24...

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Abstract

The invention discloses a dynamic arrangement of eight-speed planetary gears. The multi-speed power transmission of the present invention comprises: four epicyclic gear assemblies each having specific interconnected first, second and third rotating members, an input shaft, an output shaft, three clutches and Two brakes. Applying three of the clutch and brake combinations produces eight forward gear ratios and one reverse gear ratio.

Description

technical field [0001] The invention relates to the technical field of automatic transmissions for motor vehicles. More specifically, the invention relates to the dynamic arrangement of transmissions, clutches, brakes, and their interconnection in power transmission. Background technique [0002] The power system of a motor vehicle includes an engine, a multi-speed power transmission device (ie a multi-speed transmission), a differential transmission device and a final drive. Among other things, a multi-speed power transmission increases the vehicle's operating range by allowing the engine to operate multiple times through its torque range. The number of forward speed ratios achieved by the multi-speed power transmission determines the number of engine torque range operations. Multi-speed power transmissions, especially multi-speed automatic transmissions, have changed vehicle operating performance and fuel economy. [0003] US Patent No. 6,623,397 to Raghavan, Bucknor an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H3/66
CPCF16H3/66F16H2200/2043F16H2200/2012F16H2200/006
Inventor 里德·艾伦·鲍德温
Owner FORD GLOBAL TECH LLC