Vehicle Speed-Change System Actuator Heat Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle speed-change systems require a large space for the shift actuator, which can be affected by heat sources like the engine, leading to inefficiencies and potential damage.
Innovation Solution
The shift actuator is positioned at the rear of the transmission case, behind the shift cam, allowing it to be separated from the engine's heat source and optimizing its placement for reduced heat impact and space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift actuator is arranged in a conventional position within the transmission case, then the speed-change operation can be performed, but the shift actuator is affected by heat from the engine and requires a relatively large space
Solution Approach 1:
The shift actuator is repositioned from a conventional location to the rear portion of the transmission case, utilizing the longitudinal dimension (front-rear direction) to create spatial separation from the engine heat source. This dimensional repositioning allows the actuator to operate in a thermally favorable zone while maintaining functional connectivity through the shift cam mechanism.
Solution Approach 2:
The shift actuator is extracted from the conventional transmission case interior and repositioned to the rear portion, effectively removing it from the high-temperature zone near the engine. This extraction principle separates the actuator from the harmful thermal environment while preserving its operational function through the shift cam linkage.
2Volume of stationary object
If the shift actuator is positioned closer to the engine for compactness, then space is saved, but the actuator is more strongly affected by heat sources
Solution Approach 1:
Instead of compromising thermal performance for compactness, the invention utilizes the longitudinal dimension of the transmission case to position the actuator at the rear, creating a thermal gradient-based spatial arrangement that maintains both compact overall dimensions and favorable local thermal conditions for the actuator.
3Ease of operation
If a conventional shift actuator arrangement is used, then the speed-change function is achieved, but a relatively large space is required which may place the actuator near heat sources
Solution Approach 1:
The shift actuator is extracted from the conventional transmission case interior to the rear portion, reducing the space it occupies within the main transmission volume. This repositioning frees up interior space while maintaining the actuator's operational effectiveness through the shift cam mechanism.
Solution Approach 2:
The actuator is repositioned along the longitudinal axis to the rear portion of the transmission case, utilizing the available length dimension to achieve both compact overall packaging and optimized thermal environment for the actuator, thereby improving space efficiency without compromising operation.
Data Source
AI summary
Provided is a vehicle speed-change system including the following: a transmission positioned to the rear of a crank shaft of an engine; a transmission case that retains the transmission; a shift mechanism that has a shift cam which performs a speed-change operation of the transmission; and a shift actuator that operates the shift cam. The transmission includes a counter shaft positioned to the rear of the crank shaft, and a drive shaft to which rotation of the counter shaft is transmitted. The shift cam is positioned further to the rear than the counter shaft, and the shift actuator is arranged in a rear portion of the transmission case and to the rear of the shift cam.