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Epicyclic differential transmission

A differential transmission and transmission technology, applied in the direction of differential transmission, transmission, transmission parts, etc., can solve the problem of not being very compact

Inactive Publication Date: 2007-05-16
RICARDO UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This setup is not very compact

Method used

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  • Epicyclic differential transmission
  • Epicyclic differential transmission

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Embodiment Construction

[0018] Referring to Fig. 1, a transmission has a main axis of rotation 10 on which an electric motor 11 having a hollow rotor (not shown) is provided. The rotor is directly connected to a hollow input shaft 12 of the transmission which, as shown, includes the sun gear 13 of a two-stage planetary transmission in which all the main gear components are located in a substantially common plane.

[0019] A series of internal planet gears 14 (typically four) meshingly rotate around the sun gear and are journaled on a generally planet carrier 15 . The bracket 15 is coupled to a drive shaft 16 via the input shaft 12 and the electric motor 11 for connection to a drive wheel of a vehicle.

[0020] Surrounding the planet gears 14 is an inner ring gear (ring gear) 17 having gear teeth on the inner diameter that mesh with the inner planet gears 14 . Furthermore, the inner ring gear has gear teeth on the outer diameter which form a sun gear 18 of an outer planetary gear train.

[0021] A ...

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Abstract

A single speed epicyclic differential transmission allows an input shaft (12) to be connected to two output shafts (16, 23) with substantially equal torque split. The transmission includes two epicyclic gear trains having a common annulus / sun gear (17, 18) which acts on a differentiating gear to accommodate speed variation of the output shafts (16, 23).

Description

technical field [0001] The invention relates to a planetary differential gearing suitable in particular for vehicles, in particular electric vehicles with two drive wheels. Background technique [0002] Vehicles with two drive wheels and a single power source require the splitting of a single drive shaft into two half shafts associated with the respective drive wheels. A differential gear is also required to accommodate relative motion between the two drive wheels, for example when cornering. There is also a need to distribute drive torque equally between the two drive wheels so as to avoid torque modulation, especially in front wheel drive vehicles. [0003] Typically, a final drive reduction gear, possibly a bevel gear, is combined with a conventional bevel differential gear. This setup is not very compact. [0004] Electric vehicles typically require only a single speed reduction gear because the torque characteristics of an electric motor allow road speed to be direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K17/16B60K1/00B60K7/00F16H48/10
CPCB60K7/0007B60K1/00B60K17/16F16H48/10B60K2001/001F16H57/02004F16H63/3425F16H2048/104F16H2048/106
Inventor G·塞奇威克
Owner RICARDO UK LTD
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