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Four branch differential transmission systems.

A differential transmission and transmission system technology, applied in the direction of differential transmission, transmission, transmission components, etc., can solve the problem of not being able to obtain the Ro ratio, and achieve the effect of low cost

Inactive Publication Date: 2006-05-03
ALVI AUTOMOTIVE ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this gear set still has the problem of not being able to obtain an Ro ratio greater than +2.00 and less than -2.00

Method used

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  • Four branch differential transmission systems.
  • Four branch differential transmission systems.
  • Four branch differential transmission systems.

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] figure 1 The FBD shown in has an input shaft (first leg) 10 and an output shaft (second leg) 12 formed by a common planetary carrier 22 . The input and output can essentially be swapped so that the same node ratios (discussed below) are produced rather than different branch speed ratios. In this example, the input shaft is connected to the engine flywheel. The engine flywheel has a transverse drive output, which is most common in front wheel drive motor vehicles, but the axle frame 22 can also form an output member in the form of a gear or sprocket which leads the drive to a transversely arranged horizontal shaft.

[0029] The FBD also includes a so-called inverse planetary gear set 18 , and another so-called spur gear set 20 . Both gear sets have no ring gears, but consist only of straight or helical spur gears, which allow for a more compact design.

[0030]The reverse gear set 18 includes a sun gear 40 driven by the input shaft 10 , which meshes with a set of plan...

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Abstract

The four branch differential Transmission System, ("FBD"), comprises a first input shaft and a second output shaft. Furthermore there are third and fourth shafts which are respectively connected to first and second variators which control the speed (or torque) of the shaft, to which they are connected. Each variator can, for instance, be an electric motor which can adjust the speed of these shafts. The four shafts (branches) of the FBD are connected directly or indirectly via gears. The FBD comprises spur gear planetary gearsets. There is no requirement for a ring gear. The FBD includes two planetary gearsets using several spur gear suns and planets, which form a combination of a plus planetary gearset and a minus planetary gearset.

Description

technical field [0001] The present invention relates to a four-branch differential drive system ("FBD") for use in so-called power split transmissions ("PST"), especially in vehicles, and in particular to a four-branch differential drive system for use in vehicles. speed transmission system. This transmission transfers mechanical power via two parallel paths, and its speed ratio can be varied in a stepless and controlled manner. Background technique [0002] A conventional three-branch differential transmission system includes: a planetary gear train in which a sun gear is connected to a central shaft and coaxially disposed within an internally toothed ring gear. A number of planetary gears sit between and mesh with the sun and ring gears. The planetary gears are supported on bearings on a pedestal that is rotatably mounted coaxially on the central shaft. Using this typical setup, the sun and ring gears rotate around a central axis. The planetary gears rotate freely abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/72B60K6/365F16H48/05
CPCB60K6/365F16H3/728F16H2037/103F16H2200/2023B60L2200/26F16H3/72
Inventor 弗兰克·默勒
Owner ALVI AUTOMOTIVE ENG TECH CO LTD
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