Automatic Transmission Filter Case Sealing Design
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Solution Overview
Problem
The existing automatic transmission systems face challenges with oil leakage due to the limited installation position of the oil filter case and the need for multiple screws, which can lead to reduced sealing performance and potential oil leakage if the screws become loose.
Innovation Solution
The automatic transmission system incorporates a concave portion in the transmission casing with a seal member that fits onto the outer circumference of the filter case, reducing the need for multiple screws by using a first brim portion fixed to the transmission casing and a second brim portion inserted into a clearance, ensuring secure sealing and reduced fixing points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple screws are used to fix the filter case, then the sealing performance is improved, but the number of fixing points increases and the installation position is limited
Solution Approach 1:
The patent extracts the sealing function from the screw fixing system by introducing a dedicated seal member that fits onto the outer circumference of the case body. This separates the sealing function from the mechanical fastening function, allowing the filter case to be fixed with fewer screws while maintaining reliable sealing through the specialized seal member design.
Solution Approach 2:
The seal member acts as an intermediary element between the case body and the transmission casing. It provides the sealing function without requiring multiple screws, thereby reducing the number of fixing points while ensuring reliable oil-tight sealing at the interface.
2Reliability
If multiple screws are used to fix the filter case, then the sealing performance is improved, but the installation position is limited
Solution Approach 1:
By extracting the sealing function to a dedicated seal member, the patent removes the requirement for multiple screw fixing points, thereby increasing the adaptability of the filter case installation position and allowing more flexible mounting options on the transmission casing.
Solution Approach 2:
The seal member provides a universal sealing solution that works regardless of the specific installation position. This multi-functional approach allows the filter case to be securely sealed at various locations on the transmission casing without being constrained by the need for multiple screw holes.
3Ease of operation
If screws are loosened, then the pressing force on the contact surface decreases, but oil leakage occurs
Solution Approach 1:
The seal member is designed as a replaceable component that can be easily replaced if worn or damaged. This approach is more reliable than depending on screw tightness, as the seal member maintains consistent sealing pressure and can be swapped out without requiring complex adjustment of multiple screws.
Solution Approach 2:
The seal member serves as an intermediary that maintains the sealing function independently of screw tightness. It provides a reliable barrier against oil leakage that is not dependent on the mechanical pressure from multiple screws, thereby ensuring consistent sealing performance even if screws become loose.
Data Source
AI summary
An automatic transmission has a transmission casing accommodating a transmission mechanism and a filter case attached to the transmission casing and having an oil filter. The transmission casing has a concave portion with which at least an oil inlet or an oil outlet communicates and an overhanging portion positioned close to the concave portion and extending along a surface of the transmission casing with a clearance provided between the surface and the overhanging portion. The filter case has a case body inserted into the concave portion, a seal member sealing a boundary between an outer circumferential surface of the case body and an inside surface of the concave portion, a first brim portion protruding from the outer circumferential surface and fixed to the surface of the transmission casing, and a second brim portion protruding from the outer circumferential surface and inserted into the clearance.