Shift Cable Vibration Absorption in Manual Transmission
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Solution Overview
Problem
Existing shift lever operating force transferring devices in manual transmissions fail to absorb vibration and large movements from the transmission, leading to gear pop out and reduced durability due to the transmission of vibrations and foreign substances into the shifting mechanism.
Innovation Solution
A shift lever operating force transferring device that uses a flexible shift cable and a closing member made of elastic rubber to absorb vibrations and prevent foreign substances, improving lubrication and durability by connecting the shift lever with a control shaft through a shifting mechanism with a select lever bracket and shift connector bracket, and using a bush insertion groove to maintain a seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a rigid shift rod is used to connect the shift lever with the control shaft, then the operation force can be transmitted directly, but vibration from the transmission is transmitted to the shift lever causing discomfort
Solution Approach 1:
A rubber buffer is introduced as an intermediary component between the shift lever and the control shaft. This buffer absorbs vibration from the transmission while still allowing operation force to be transmitted, thus resolving the contradiction between direct force transmission and vibration isolation
Solution Approach 2:
The rigidity parameter of the connection between shift lever and control shaft is changed by using a flexible rubber buffer instead of a rigid rod. This parameter change allows the system to filter out high-frequency vibrations while maintaining low-frequency operational control
2Device complexity
If a rigid shift rod is used, then structural simplicity is maintained, but substantially large movement of the transmission can cause gear pop out
Solution Approach 1:
The rubber buffer acts as a protective intermediary that absorbs substantially large movements from the transmission, preventing these movements from being transmitted to the shift lever and causing gear pop out, thus improving reliability while maintaining structural simplicity
Solution Approach 2:
The rubber buffer provides beforehand cushioning by being pre-installed between the shift lever and control shaft, ready to absorb any substantially large movements that may occur during vehicle operation, preventing gear position instability before it can occur
3Ease of manufacture
If the connecting portion is open, then assembly and maintenance are easier, but foreign substances can flow into the operation part causing wear
Solution Approach 1:
A rubber closing member is used to seal the connecting portion, preventing foreign substances from entering the operation part. The flexible rubber material allows for easy assembly and disassembly while providing effective protection against contamination
Solution Approach 2:
The closing member acts as an intermediary barrier between the external environment and the internal operation part, blocking foreign substances while allowing the system to remain accessible for assembly and maintenance
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 device effectively reduces vibration and shock transmission to the shift lever, prevents gear pop out, and enhances durability by absorbing sudden movements and maintaining a seal against foreign substances, ensuring smooth operation and prolonged device life.
Implementation Method 1
a closing member made of elastic rubber to absorb vibrations and prevent foreign substances
Data Source
AI summary
Disclosed herein is a shift lever operating force transferring device of a manual transmission. The device includes a shift cable that connects a shift lever with a control shaft. Furthermore, the shift cable absorbs vibration and shock transmitted to the shift lever. Additionally, the device includes a bush insertion groove in which a select bush 32 is inserted and a closing member configured to seal the bush insertion groove from the exterior.