Belt-Driven CVT Guiderail for Broken Chain Noise Suppression
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Solution Overview
Problem
Existing belt-driven continuously variable transmissions suffer from intense noise due to chain breakages, as broken chains can collide with the casing, especially at high rotational speeds, leading to increased crash impacts and noise.
Innovation Solution
A belt-driven continuously variable transmission system with a guiderail that rotates to alter the inclination of the chain belt, increasing the speed ratio when a chain break occurs, thereby reducing collision impact and noise by changing the chain belt's tension and entrance points into the pulley grooves, using a spring member or actuator system to manage this rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a guiderail is arranged between the pulleys to suppress chain vibrations, then chain belt vibrations are suppressed, but when the chain belt breaks, the broken chain collides against the casing generating intense noise
Solution Approach 1:
The guiderail is configured to be movable rather than fixed, allowing it to change position dynamically. When the chain belt breaks, the spring member pushes the guiderail to move, which in turn changes the inclination of the straight portion of the chain belt to increase the speed ratio and reduce collision impact
Solution Approach 2:
The system changes the speed ratio parameter dynamically in response to chain breakage. By moving the guiderail, the inclination of the chain belt is altered, which changes the effective speed ratio and reduces the kinetic energy of the broken chain, thereby reducing collision noise
2Power
If the rotational speed of the pulley is increased to improve power transmission, then power transmission efficiency is improved, but the crash impact of the broken chain is increased
Solution Approach 1:
The spring member is pre-loaded to be in a compressed state, storing elastic potential energy in advance. When the chain belt breaks, this pre-stored energy is immediately released to push the guiderail and alter the chain inclination, counteracting the harmful effects before they fully develop
Solution Approach 2:
The spring member acts as a cushioning mechanism that is already in place and energized. Upon chain breakage, it provides immediate force to modify the chain path, cushioning the impact before the broken chain can collide with the casing at high speed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively suppresses collision noise and impact from broken chain belts by altering the chain belt's inclination to increase the speed ratio, reducing friction loss and enhancing response times during normal operation while minimizing noise and impact during chain breakages.
Implementation Method 1
a spring member that applies an elastic force to the guiderail to rotate the guiderail to alter an inclination of the straight portion of the chain belt in a direction to increase the speed ratio
Data Source
AI summary
A belt-driven continuously variable transmission in which a collision noise of a broken chain belt can be suppressed is provided. In the transmission, a chain belt is applied to belt grooves of pulleys to transmit power therebetween, and a speed ratio is varied by changing a width of the belt groove of at least one of pulleys. The transmission comprises: a guiderail that is contacted to the chain belt to suppress vibrations in the chain belt and that is allowed to rotate with a change in an inclination of the chain belt; and a pushing mechanism that applies a load to the guiderail to rotate the guiderail to alter an inclination of the chain belt in a direction to increase the speed ratio when the chain belt is broken.