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Continuously variable transmission and method of controlling it

By using a stepper motor and a sliding drive device to be coaxially installed in the continuously variable transmission, and using the current changes of the stepper motor to control the position of the movable wheel, the problem of sensor dependence and structural complexity is solved, and high precision, low energy consumption and Compact variable speed control.

Inactive Publication Date: 2008-01-16
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the live flange is more susceptible to slippage due to torque variations and offset loads on the belt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0110] Embodiments of the present invention are described below with reference to the drawings.

[0111] Fig. 1 is a partial structural diagram of a continuously variable transmission related to an embodiment of the present invention. Fig. 2 shows the action of the partial structure of the continuously variable transmission in Fig. 1 .

[0112] A primary wheel (drive side wheel) 4 is installed on the engine output shaft 1, and it is made of a pair of opposite fixed wheels 2 and movable wheels 3. The fixed wheel 2 and the movable wheel 3 are tapered on their opposite surfaces. Between the opposing tapered surfaces a V-belt 5 is mounted. A driven shaft (not shown) connected to a shaft, for example, can be arranged parallel to the engine output shaft 1, and a secondary wheel (driven side wheel) consisting of a pair of fixed wheels and a movable wheel is also arranged on the driven shaft. . The V-belt 5 is wound on the primary pulley 4 and the secondary pulley (not shown), and...

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PUM

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Abstract

To provide a continuously variable transmission and a control method thereof, allowing for control of the axial position of a movable sheave without a sensor for measuring the axial position of the movable sheave on a rotational shaft and for stable control with the movable sheave being held in position, without the increase in the size of mechanisms and power consumption. A continuously variable transmission in which, on a rotational shaft 1 thereof are mounted a fixed sheave 2 positioned in the axial direction and a movable sheave 3 slidable axially, so as to face each other, a motor is provided for driving the movable sheave, and a slide driving means 16 is provided for sliding the movable sheave 3 axially by the rotation of the motor, characterized in that: the motor is a step motor 6, and the step motor 6 and the slide drive means 16 are mounted coaxially with the rotational shaft.

Description

technical field [0001] The present invention relates to a belt type continuously variable transmission (CVT) installed in electric motors such as automobiles and motorcycles to transmit driving force from the electric motor to a propeller shaft, and also relates to a method of controlling the continuously variable transmission. Background technique [0002] In a continuously variable transmission for vehicles, a pair of pulleys (i.e., a primary pulley on the driving side and a secondary pulley on the driven side) are respectively installed on the driving side and the driven side of a rotating shaft, and an annular V A belt bridges between and couples the two pulleys. Among the two pulleys, one is a fixed pulley, which is axially positioned, and the other is a movable pulley, which can slide axially. Two pulleys are successively mounted on the rotating shaft and thus face each other. Since the two opposite surfaces of the fixed wheel and the movable wheel are gradually tape...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/00F16H55/56F16H61/32F16H9/18F16H9/00F16H61/662F16H63/06
CPCF16H63/062F16H2061/283F16H61/66254F16H63/067
Owner YAMAHA MOTOR CO LTD