Axle Shift Collar Mechanism for Aligned Pinion Gear Engagement
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Solution Overview
Problem
Existing axle assemblies lack an efficient mechanism to selectively connect and disconnect drive pinion gears to the drive pinion, leading to inefficiencies in torque transmission and increased stress on components due to misalignment and axial forces during gear meshing.
Innovation Solution
The axle assembly incorporates a shift mechanism with a rotatable shift collar, actuator, detent linkage, and linkage retaining device, allowing for selective engagement and disengagement of drive pinion gears, which inhibits unwanted rotation and axial movement, thereby reducing stress on the actuator and improving torque transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clutch collar is used to connect drive pinion gears to the drive pinion, then gear engagement is achieved, but stress on components increases due to misalignment and axial forces
Solution Approach 1:
The alignment rod acts as an intermediary component between the shift collar and the drive pinion gears. It provides a reference alignment feature that ensures the shift collar engages the drive pinion gears at the correct position, preventing misalignment and reducing axial forces during engagement. This mediator component resolves the contradiction by enabling reliable engagement while minimizing stress.
2Adaptability or versatility
If the shift collar is movable along the axis, then gear selection is enabled, but unwanted rotation and axial movement occur increasing stress on the actuator
Solution Approach 1:
The alignment rod extracts the alignment function from the shift collar itself, providing a separate reference feature. This allows the shift collar to move freely along the axis for gear selection while the alignment rod prevents unwanted rotation and excessive axial movement, thereby reducing stress on the actuator without compromising gear selection capability.
3Productivity
If drive pinion gears are spaced apart from the drive pinion, then gear meshing is possible, but torque transmission efficiency decreases
Solution Approach 1:
The alignment rod performs preliminary alignment of the shift collar with the drive pinion gears before engagement occurs. This preliminary positioning ensures that when the shift collar moves along the axis to engage the gears, the spacing between the drive pinion gears and drive pinion is optimized for efficient torque transmission, while the alignment rod itself adds minimal complexity to the overall mechanism.
Data Source
AI summary
An axle assembly having a collar that receives a shift collar that is moveable along an axis. An alignment rod may be provided to inhibit rotation of the collar about the axis. A linkage retaining device may be provided that is selectively engageable with a linkage that is operatively connected to the shift collar to inhibit rotation of the linkage.