Differential Lock Assisted Return Pneumatic Control
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Solution Overview
Problem
Traditional differential lock mechanisms can become stuck in the engaged position, leading to carrier failure when differential action is required, due to inadequate disengagement mechanisms.
Innovation Solution
A differential lock mechanism using a pneumatic control system with two signals to move a shift collar between engaged and disengaged positions, assisted by a resilient member and a rod with an internal bore for enhanced return force, allowing reliable engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single return spring is used to disengage the differential lock, then the device complexity is reduced, but the reliability deteriorates because the shift collar can become stuck in the engaged position
Solution Approach 1:
The patent combines two pneumatic signals into a single pneumatic control system that works together with one return spring. The first pneumatic signal assists the return spring during normal disengagement, while the second pneumatic signal provides backup force if the shift collar becomes stuck, merging the functions of multiple potential return mechanisms into a coordinated system.
Solution Approach 2:
The first pneumatic signal is activated preliminarily during normal operation to assist the return spring in disengaging the shift collar. This preliminary action prevents the need for a complex second-stage mechanism by addressing potential sticking issues before they occur, while still maintaining simplicity in the overall design.
2Use of energy by moving object
If air pressure is simply removed to disengage the differential lock, then the use of energy is reduced, but the force generated for disengagement is insufficient when the lock fails to release
Solution Approach 1:
The patent employs a dual pneumatic signal system where the first pneumatic signal provides primary disengagement force by acting on the shift collar in conjunction with the return spring. The second pneumatic signal serves as a backup, providing additional force through the rod's internal bore if the first signal is insufficient, thereby maintaining low energy consumption while ensuring adequate disengagement force.
Solution Approach 2:
The system changes the pneumatic pressure parameters dynamically: the first pneumatic signal operates at a standard pressure level for normal disengagement, while the second pneumatic signal activates at a different pressure configuration to provide enhanced return force when needed, allowing the same pneumatic system to deliver variable force levels without increasing overall energy consumption.
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
Ensures reliable engagement and disengagement of the differential lock, providing a significant increase in disengagement force, potentially doubling the return force compared to traditional systems, thereby preventing carrier failure.
Implementation Method 1
The first pneumatic signal is exerted against the enlarged flange portion to move the shift collar into the engaged position
Implementation Method 2
The second pneumatic signal is communicated through the internal bore to return the shift collar to the disengaged position
Implementation Method 3
a resilient member biases the shift collar to the disengaged position
Data Source
AI summary
A differential lock mechanism includes a shift member and a shift collar that is moveable by the shift member between an engaged position with a differential assembly and a disengaged position. A pneumatic control provides a first pneumatic signal to move the shift collar into the engaged position and provides a second pneumatic signal to return the shift collar to the disengaged position.