Variable-Speed Drive Shock Absorber for Vehicle Power Unit Noise Reduction
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Solution Overview
Problem
The existing variable-speed drive devices for vehicle power units face challenges in reducing noise and increasing the strength of the boss part fixing the stopper pin and its adjoining components while maintaining a lightweight design, especially when the shift arm rotates at high speeds, leading to increased hitting sounds and potential structural weaknesses.
Innovation Solution
Incorporating a shock absorbing device on either the master arm or the stopper pin, which protrudes into the path of rotary movement, absorbs shocks during high-speed rotation, thereby reducing noise and enhancing the structural integrity without increasing weight or thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shift spindle is rotated at increased speed to perform speed change operation in a short time, then the productivity is improved, but the master arm hits the stopper pin at high speed producing increased hitting sound and requiring increased strength of the boss part
Solution Approach 1:
A buffer member is introduced as an intermediary element between the master arm and the stopper pin. This buffer member absorbs the impact during high-speed rotation, preventing direct high-speed contact between the master arm and stopper pin, thereby reducing hitting sounds while allowing fast speed change operations
Solution Approach 2:
The buffer member is pre-positioned in the opening of the master arm before the speed change operation occurs. This beforehand cushioning arrangement ensures that when the master arm rotates at high speed and contacts the stopper pin, the buffer member is already in place to absorb the shock, preventing direct impact and reducing noise
2Reliability
If the boss part fixing the stopper pin is given increased strength to withstand high speed hitting, then the reliability is improved, but the thickness and weight of the boss part will increase
Solution Approach 1:
The buffer member serves as a mediator that protects the boss part from direct high-speed impact forces. By absorbing the shock before it reaches the stopper pin and boss part, the buffer member allows the boss part to maintain its original, lighter weight while still withstanding the operational forces through the buffered contact
3Productivity
If the master arm rotates at high speed for quick speed change, then the productivity is improved, but the defining edge of the opening hits the outer surface of the stopper pin causing increased hitting sound
Solution Approach 1:
The buffer member is positioned within the opening of the master arm to serve as an intermediary between the defining edge of the opening and the stopper pin. During high-speed rotation, this buffer member absorbs the impact, preventing direct contact between the defining edge and stopper pin outer surface, thereby eliminating striking sounds while maintaining fast response time
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 implementation of shock absorbing devices effectively suppresses noise and strengthens the boss part fixing the stopper pin and its adjoining components, ensuring reduced weight and noise while maintaining structural durability.
Implementation Method 1
at least one of the master arm and the stopper pin is provided thereon with a shock absorbing device; and at least a part of the shock absorbing device protrudes into a path of rotary movement of the stopper pin in the opening of the master arm
Implementation Method 2
the shock absorbing device is deformed to suppress the shocks that occur when the stopper pin regulates the rotary movement of the master arm
Data Source
AI summary
A variable-speed drive device for a power unit to be used in a vehicle equipped with a stopper pin passed through an opening in a master arm for regulating the amount of rotary movement of the master arm. Shock-absorbing device is provided on the master arm or the stopper pin At least a part of the shock-absorbing device is formed to project into the path along which the stopper pin moves relative to the opening of the master arm, from a stopper pin outer surface or from edge portions of a defining edge of the opening in the master arm onto extension of the stopper pin path. As a result, even if the master arm and the stopper pin contact one another at high speed, it is possible to suppress the sound of contact and suppress an increase in the weight of a stopper pin fixing part.