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Continuously variable transmission

A transmission device and continuously variable transmission technology, applied in the field of transmission devices, can solve the problem of not directly controlling the transmission ratio and the like

Inactive Publication Date: 2009-12-30
TOROTRAK (DEV) LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

but does not directly control the transmission ratio

Method used

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Examples

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Embodiment Construction

[0016] figure 1 A well known full toroidal rolling traction variator is shown. The invention has been developed in conjunction with a CVT using this type of transmission, which is particularly suitable for the purpose of the invention, but in principle other types of transmissions can also be used. Transmission 10 includes coaxially mounted input raceway 12 and output raceway 14, the adjacent faces 6, 8 of the input and output raceways are semi-annularly concave and jointly define a substantially annular cavity 16, which houses a Movable torque transmitting members in the form of rollers 18 . In fact, variators used in practice usually have two or more such rollers spaced at circumferential intervals around cavity 16 . Each roller 18 runs on a face 6, 8 of a respective raceway 12, 14, thereby serving to transmit power from one to the other. The rollers 18 are movable back and forth circumferentially about a common axis 20 of the raceways 12 , 14 . It can also be screwed in...

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Abstract

The invention concerns an arrangement for control of a continuously variable transmission. The transmission includes a variator (10) having a movable torque transfer part (rollers 18) whose position corresponds to a variator drive ratio. A hydraulic actuator (28) is arranged to exert an adjustable force on the torque transfer part. The transmission further comprises a flow control arrangement which is arranged to receive as control inputs (a) the current position of the torque transfer part and (b) a demanded position for it. The demanded position may for example be determined by driver input. The flow control arrangement is adapted to supply through a s upply o utlet w hich c omniunicates w ith t he h ydraulic actuator a flow of fluid which is modulated in accordance with an error between the two control inputs. The flow of fluid increases with increasing error. A relief passage (110) leads from the said outlet to a pressure sink and is constricted so that fluid flow through it results in a p ressure at the hydraulic a ctuator which is g reater than that of the sink by an amount which corresponds to the rate of flow through the relief passage. The result is a mode of control of the transmission which possesses some of the advantages of both torque and ratio control.

Description

technical field [0001] The present invention relates to continuously variable transmissions and in particular to devices for controlling the variator in such transmissions. Background technique [0002] Within a continuously variable transmission there is a device having a rotary input, a rotary output and some mechanism for transferring the rotary drive from one to the other in a continuously variable ratio. Such a device will be referred to herein as a "transmission". [0003] Some form of control must be performed through the transmission, and there are two specific control modes known in the art. [0004] Certain transmissions are controlled to provide specified transmission ratios (radios). This gear ratio may be set directly by the driver, or it may be determined by an electronic controller, but in either case there is some kind of signal (which may be mechanical or electronic) corresponding to the desired gear ratio, And have some mechanism for adjusting the actual...

Claims

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Application Information

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IPC IPC(8): F16H61/664
CPCF16H37/086F16H61/6649F16H15/38F16H61/6648F16H61/664F16H61/66
Inventor 布赖恩·多诺霍菲利普·邓肯·温特约翰·威廉·爱德华·富勒
Owner TOROTRAK (DEV) LTD
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