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Twisted belt transmission

A technology of transmission system and active pulley, applied in the direction of transmission device, friction transmission device, belt/chain/gear, etc., can solve problems such as reducing overall efficiency and difficulty in determining meshing

Inactive Publication Date: 2008-08-20
PH B INNOVATIONS SARL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficulty determining meshing when radii vary widely and sliding at the mating contact surfaces reduces overall efficiency

Method used

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  • Twisted belt transmission

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Embodiment Construction

[0021] Other features and characteristics of the invention will become apparent with reference to the attached drawings ( FIG. 1 ) and from the following detailed description of an advantageous embodiment given by way of example.

[0022] FIG. 1 shows a front view of a preferred variant of the present transmission system applied to assist bicycle starting assistance. The supporting structure which is the frame of the bicycle is not shown. The driving pulley 1 rotates around the axis of the pedal crank mechanism, and the driven pulley 3 rotates around the axis of the rear wheel.

[0023] In the case of application to a bicycle start assist, the system is usually only used during the phase of starting the bicycle. Thus, the linkage is designed to manually and / or automatically select how to drive the rear wheel of the bicycle, ie also advantageously provide for use with the present transmission or with a conventional transmission employing a chain and one or more rear sprockets....

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Abstract

The invention relates to a helical belt transmission with progressive reduction, wherein the open belt (2) twists around the driving pulley (1) while unwinding from the driven pulley (3).

Description

technical field [0001] The invention relates to the field of mechanical transmissions with variable transmission ratios. Background technique [0002] The use of gear transmissions with variable radius and fixed inner axis distance for starting aids can be found in the following patent: FR 0309582, filed 04.08.2003, published 11.02.2005 Patent application (arranged in a coaxial manner), or the unpublished French patent application No. 0406393 filed on 14 June 2004 (arranged with its axes parallel). These systems are not operated continuously, but in phases where varying speed ratios are desired. Normally, during these phases the drive shaft remains driven and there is no problem reversing the transmission, eg in the case of engine brake. In order to manufacture these gear sets, matching meshing curves need to be followed to keep the inner axis distances at common values ​​for tangency. Determining meshing is difficult when the radii vary widely and sliding at the mating c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H19/00
CPCF16H19/005Y10T74/19191
Inventor 让-马克·巴焦
Owner PH B INNOVATIONS SARL