Elastically Compressible Axle Stop for Drive Shaft Shock Absorption
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Solution Overview
Problem
Existing vehicle axle differential systems face issues with drive shaft movement limitations, leading to shock-induced cover breakage and premature wear due to high friction, requiring complex adjustments and having low durability.
Innovation Solution
An elastically compressible stop with a first part for axial movement absorption and a second part for point contact with the drive shaft, reducing friction and eliminating the need for assembly line adjustments, integrated with a hub reduction unit and an intermediate piece for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid stop is used to limit drive shaft movement, then the cover is protected from excessive movement, but high friction causes premature wear and shocks can break the cover
Solution Approach 1:
The stop is designed with two distinct cross-sectional areas: a first cross-section S1 that contacts the drive shaft end face for absorbing axial compression forces, and a second cross-section S2 that is smaller and provides point contact to minimize friction. This parameter change in geometry allows the stop to simultaneously handle radial loads with minimal friction and axial shocks
Solution Approach 2:
The stop is divided into two functional parts based on cross-sectional area: the first part (S1) absorbs axial movements in compression, while the second part (S2) provides a substantially point contact to minimize friction efforts. This segmentation allows each part to perform its specific function optimally
2Force
If a stop with large contact area is used to absorb axial forces, then axial movement is absorbed, but friction increases causing premature wear
Solution Approach 1:
The stop features a first cross-section S1 for absorbing axial compression forces and a second cross-section S2 that is smaller than S1 to provide point contact. This parameter differentiation allows the stop to absorb axial forces effectively while minimizing friction contact area
Solution Approach 2:
Different parts of the stop have different cross-sectional properties: the first part has a larger cross-section optimized for force absorption, while the second part has a smaller cross-section optimized for minimal friction contact. This local quality differentiation resolves the contradiction between force absorption and wear reduction
3Manufacturing precision
If complex adjustments are made during production to provide appropriate clearance, then proper operation is ensured, but manufacturing complexity and time increase
Solution Approach 1:
The stop is designed to be self-adjusting through its elastic compressibility. The elastically compressible stop automatically adapts to the drive shaft position and provides appropriate clearance without requiring manual adjustment during assembly, making the system self-configuring
4Object-affected harmful factors
If the stop is made elastically compressible to absorb shocks, then cover breakage is prevented, but the stop may deform under continuous load
Solution Approach 1:
The elastically compressible stop acts as a cushioning element that absorbs shock loads before they can transmit to the cover and cause breakage. The elastic deformation of the stop protects the cover from impact forces
Solution Approach 2:
The stop is designed with specific geometric parameters (cross-sectional areas S1 and S2) and material properties that allow it to be elastically compressible for shock absorption while maintaining sufficient structural integrity for continuous operation
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 solution effectively absorbs shocks, reduces wear, and increases the durability of the axle system by providing a point contact that minimizes friction and eliminates the need for complex adjustments during assembly, enhancing the overall performance and longevity of the axle components.
Implementation Method 1
the stop being elastically compressible in the axial direction between the cover and an end of the drive shaft
Data Source
AI summary
Disclosed is an assembly to be mounted at an end portion of an axle of a vehicle, the axle including a differential carrier housing containing a differential and drive shafts, each having one end connected to the differential and a second end to connect to a wheel of the vehicle. The assembly includes a cover to be mounted at the end portion of the axle and fastened to a wheel hub, and a stop elastically compressible in the axial direction and fastened to the cover so as to face and contact one end face of a drive shaft. The stop includes a first part having a first cross-section S1 and configured to absorb in compression axial movements of the drive shaft, and a second part having a second cross-section S2 smaller than the first cross-section S1 and configured to provide a substantially point contact with the drive shaft end face.