Vehicle Driving Apparatus Rib Structure Heat Dissipation
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Solution Overview
Problem
Electrically powered trucks face increased lubricant temperature due to higher driving torque, requiring effective heat dissipation without adding weight or increasing manufacturing costs, as traditional heat dissipation mechanisms and thin cast housings can lead to deformation and cost issues.
Innovation Solution
A vehicle driving apparatus with a housing structure featuring a cast plate member and rib structure integrated along the vehicle's travel direction, which enhances surface area for heat dissipation without blocking airflow, reinforces the cast plate, and reduces thickness and weight, eliminating the need for separate heat dissipation mechanisms and connection members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate heat dissipation mechanism is provided for the speed reduction mechanism, then heat dissipation performance is improved, but device complexity and weight increase
Solution Approach 1:
The patent merges the heat dissipation function with the housing structure by integrating ribs into the housing that serve dual purposes: structural support and heat dissipation. This eliminates the need for separate heat dissipation mechanisms while maintaining effective thermal management of the lubricant in the speed reduction mechanism.
Solution Approach 2:
The housing structure is designed to perform multiple functions simultaneously: it provides mechanical support, contains the speed reduction mechanism, and dissipates heat through integrated ribs. This multi-functionality reduces overall device complexity and weight while achieving effective heat dissipation.
2Weight of moving object
If the cast plate member is made thin to reduce weight, then vehicle weight is reduced, but manufacturing precision deteriorates due to deformation
Solution Approach 1:
The cast plate member is segmented with ribs integrated into its structure. These ribs divide the large flat surface into smaller sections, providing structural reinforcement that prevents deformation during casting while maintaining overall thinness for weight reduction.
Solution Approach 2:
The rib structure provides localized reinforcement at critical areas of the cast plate member without increasing overall thickness. This allows the plate to maintain thinness for weight reduction while having strengthened regions that prevent deformation during manufacturing.
3Manufacturing precision
If the cast plate member thickness is increased to prevent deformation, then manufacturing precision is improved, but weight increases
Solution Approach 1:
Instead of uniformly increasing thickness, the cast plate member incorporates ribs that segment the structure and provide reinforcement only where needed. This maintains thin overall thickness for weight reduction while preventing deformation through strategic structural division.
Solution Approach 2:
The rib structure provides localized reinforcement at specific areas of the cast plate member, allowing thinness to be maintained in non-critical areas for weight reduction while having strengthened regions that prevent deformation during manufacturing.
4Temperature
If heat dissipation fins are separately attached, then heat dissipation performance is improved, but device complexity and weight increase
Solution Approach 1:
The heat dissipation ribs are merged with the housing structure as an integrated feature rather than separate attachments. This eliminates the need for connection members and assembly steps, reducing device complexity while maintaining effective heat dissipation from the speed reduction mechanism.
Solution Approach 2:
The housing structure serves multiple functions including structural support and heat dissipation through its integrated rib features. This eliminates the need for separate heat dissipation components and their associated mounting hardware, reducing overall device complexity.
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
This configuration effectively dissipates heat from the speed reduction mechanism, reduces vehicle weight and manufacturing costs, while preventing deformation and improving yield during manufacturing.
Implementation Method 1
the rib structure is provided along a direction in which the vehicle travels and integrated with the cast plate member... The thus configured vehicle driving apparatus can dissipate heat from a lubricant in the speed reduction mechanism via the housing structure
Data Source
AI summary
A vehicle driving apparatus is capable of reducing vehicle weight and manufacturing cost while improving performance of heat dissipation from a speed reduction mechanism. The vehicle driving apparatus includes a motor, which is incorporated in a vehicle, a speed reduction mechanism, which transmits driving force produced by the motor to a differential gear of the vehicle, and a housing structure, which accommodates the speed reduction mechanism and the differential gear. The housing structure includes a rear cover, adjacent to the speed reduction mechanism, and a rib structure, provided on the rear cover, and the rib structure is provided along the direction in which the vehicle travels and integrated with the rear cover.