Differential Mounting Structure With Replaceable Bushing Assembly
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Solution Overview
Problem
The existing differential mounting systems in vehicles require extensive maintenance and assembly processes, including the replacement of the entire vehicle body frame when rubber bushings wear out, leading to high costs and inefficiencies, as well as complex assembly due to pre-installed pipes and welding.
Innovation Solution
A differential mounting structure that allows for the replacement of bushing assemblies by using a pipe with a flange and coupling bolts and nuts, enabling easy detachment and replacement of worn bushings, with optional rubber packing for vibration insulation, simplifying the assembly process and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pipe and cross member are coupled together by welding, then the structural strength and stability are improved, but the ease of repair deteriorates because the entire vehicle body frame must be replaced when bushings wear out
Solution Approach 1:
The mounting structure is divided into separable components: the cross member with through holes, the pipe with flange, and the bushing. This segmentation allows the bushing to be replaced independently without affecting the welded connection between the cross member and vehicle body frame, resolving the contradiction between structural strength and ease of repair.
Solution Approach 2:
The bushing is extracted as a separate replaceable component from the welded assembly. By taking out the bushing as an independent element that can be removed and replaced through the through holes, the design maintains the permanent welded structural connections while enabling easy replacement of worn bushings.
2Reliability
If the pipe is pre-installed at the cross member by welding, then the reliability of the mounting structure is improved, but the device complexity increases due to the requirement of large jigs for accurate bushing insertion
Solution Approach 1:
The assembly process is segmented into distinct stages: first welding the pipe to the cross member, then separately installing the bushing through the through holes. This segmentation eliminates the need for complex jigs during bushing installation, as the bushing can be freely inserted through the open through holes rather than being forced into pre-closed pipe openings.
Solution Approach 2:
The through holes are preliminarily formed in the cross member before final assembly, providing ready access for bushing insertion. This preliminary preparation of the mounting structure allows for simple, tool-free bushing installation while maintaining the reliability of the pre-welded pipe connection.
3Reliability
If the entire rear cross member module is removed for replacing worn down bushing, then the reliability of maintaining proper bushing function is ensured, but the loss of time and productivity deteriorates
Solution Approach 1:
The bushing is extracted as a standalone replaceable component, allowing maintenance workers to remove and replace only the worn bushing rather than the entire cross member module. This extraction of the critical wear component enables reliable bushing function restoration while dramatically improving maintenance productivity.
Solution Approach 2:
The worn bushing is discarded and replaced with a new one, while the valuable cross member module and pipe remain in service. This selective replacement approach maintains reliability by ensuring proper bushing function while preserving productive asset utilization by keeping the main structural components in use.
Data Source
AI summary
A differential mounting structure includes a pipe into which a bushing coupled to the differential is forcibly inserted. The pipe is inserted into a through hole of a cross member and is fixedly attached at one end thereof to a flange. Coupling bolts penetrating the flange are connected to nuts welded to the cross member. When the bushing used for installing the differential to the vehicle body is worn down and can no longer do its job, only the bushing mounting assembly is replaced or repaired in the present invention.