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Continuously variable transmission

A continuously variable transmission, transmission technology, applied in the direction of components with teeth, belts/chains/gears, mechanical equipment, etc., can solve the problem of not considering the instantaneous speed ratio of the transmission, and achieve the effect of enhanced durability

Inactive Publication Date: 2008-06-11
VAN DOORNES TRANSMISSIE BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By an appropriate choice of said curvature, it is possible to ensure that the drive belt is always advantageously kept approximately perpendicular to the pulley shaft, regardless of the instantaneous gear ratio of the variator

Method used

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Examples

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Embodiment Construction

[0019] figure 1 A sectional view of a conventional continuously variable transmission 1 is described. The transmission 1 comprises a primary pulley 2 capable of being driven by an engine (not shown) and a secondary pulley 3 driving a load (not shown), both pulleys being provided with pulleys respectively fixed to pulley shafts 20, 30 Discs 21 , 31 , and pulley discs 22 , 32 capable of being moved axially relative to said shaft 20 , 30 . The drive belt 10 is clamped between the pulley discs 21 , 22 , 31 , 32 so that mechanical power can be transmitted between the pulley shaft 20 and the pulley shaft 30 with the help of friction. In this case, the gear ratio of the transmission 1 is determined by the first rotation radius R of the transmission belt 10 P and the second radius of rotation R S , that is, the ratio of the effective radial positions between the pulley disks 21 , 22 , 31 , 32 of the pulley 10 and the pulley 20 is determined. The radius of rotation R can be made by...

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Abstract

Continuously variable transmission (1) for motor vehicles, provided with a primary pulley (2) and a secondary pulley (3), around which a drive belt (10) is arranged, clamped between two conical pulley discs (21, 22; 31, 32) of the respective pulley (2; 3), a running surface of at least one pulley disc (21; 22, 31; 32) of the primary pulley (2) and the secondary pulley (3), by means of which running surface this pulley disc is in contact with the drive belt (10), being provided, as seen in a cross section oriented perpendicular to a tangential direction, with a curvature, so that a pulley angle between a tangent on the running surface and a radial direction varies between a lowest value at the location of a radially innermost position on the running surface and a highest value at the location of a radially outermost position on the running surface, in which transmission the curvature of the running surface of the primary pulley (2) and the curvature of the running surface of the secondary pulley (3) differ from one another.

Description

technical field [0001] The present invention relates to a continuously variable transmission for a motor vehicle for transmitting mechanical power between an engine and a load, the transmission ratio of the torque level and the rotational speed between the pulleys can be continuously varied within a set range . Transmissions of this type are generally known and are particularly suitable for use in motor vehicles. Background technique [0002] It is known that in a transmission, the drive belt is clamped between the conical pulley discs of the two pulleys, the ratio of the radial position of the drive belt on the primary and secondary pulleys, or known as the first rotation The ratio of the radius to the second radius of rotation is used to determine the gear ratio of the transmission. Since one of the pulley disks of each pulley is arranged to be able to be moved in the axial direction, the size of the radius of rotation mentioned above can be changed in the opposite direc...

Claims

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Application Information

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IPC IPC(8): F16H61/00F16H61/662
CPCF16H9/125F16H9/12F16H61/00
Inventor 阿德里安纳斯·约翰尼斯·威廉默斯·范德莱斯特约翰尼斯·赫拉尔杜斯·卢多维克斯·玛丽亚·范施皮吉克
Owner VAN DOORNES TRANSMISSIE BV
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