Coaxial Ring-Piston Shift Module for Low-Friction Differential Locking
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Solution Overview
Problem
Existing shift actuators for differential locks, shift gearboxes, and axle connections are complex, heavy, and costly due to numerous parts, requiring extensive calibration and prone to friction issues, which lead to inefficiencies and increased manufacturing costs.
Innovation Solution
A shift actuator configuration featuring a ring piston positioned coaxially on a transmission shaft, eliminating the need for a shift rod and fork, and utilizing a rotatably mounted shift sleeve with a slide or roller bearing for reduced friction and simplified assembly, along with an elastic resetting element for pressure application and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional shift actuator configuration with shift fork, shift rod, and piston is used, then the shifting function is achieved, but the device complexity increases due to a large number of individual parts
Solution Approach 1:
The patent combines the shift rod and shift fork into a single integrated shift piston component. The shift piston directly engages with the gear teeth and performs both the pushing and directional functions that were previously separated between the shift rod and shift fork, thereby reducing the number of parts while maintaining the shifting function.
Solution Approach 2:
The shift piston is designed to perform multiple functions: it acts as both the actuating piston and the shift fork equivalent, directly engaging gear teeth to change gear ratios. This multi-functional design eliminates the need for separate shift rod and shift fork components, reducing device complexity.
2Weight of moving object
If a conventional shift actuator with multiple components is used, then the shifting mechanism is complete, but the weight increases due to more parts that must be accelerated and decelerated
Solution Approach 1:
By merging the shift rod and shift fork into the shift piston, the patent reduces the total mass of moving components. Fewer separate parts mean less total weight that must be accelerated and decelerated during gear shifting operations, improving shifting speed and reducing inertial losses.
3Manufacturing precision
If conventional shift actuators are used, then the shifting function is achieved, but extensive calibration is required for tooth crest-tooth crest and tooth crest-tooth base distances
Solution Approach 1:
The integrated shift piston design eliminates the need for separate shift rod and shift fork components that require precise calibration of tooth crest-tooth crest and tooth crest-tooth base distances. The unified structure simplifies manufacturing and assembly by reducing the number of precision calibration steps required.
4Reliability
If conventional shift actuators with shift piston and shift fork are used, then the shifting mechanism works, but friction occurs between the piston and fork in the activated stage
Solution Approach 1:
By integrating the shift rod and shift fork into a single shift piston, the patent eliminates the interface between the piston and fork that generates friction. The unified structure removes this source of energy loss and improves shifting smoothness by eliminating the friction-prone connection point.
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
This configuration reduces weight, manufacturing costs, and calibration time, while minimizing friction and noise, resulting in a more efficient and robust shift module for differential locks, gearboxes, and axle connections.
Implementation Method 1
the compression spring supports itself on the other side. While in the resting position, the shift fork is pressed into a first direction by the compression spring
Implementation Method 2
The engaged condition of the clutch is accomplished through a respective pressure impact at the piston rod and moves the piston rod into a second direction
Data Source
AI summary
A shift module (1) for a differential lock (7), a shift gearbox or an axle connection. The shift module has a shift sleeve (2) and a shift piston (4) which is designed as a ring piston (4). The shift module is mounted in one of a respective differential lock, a respective distribution gearbox, and a respective axle connection.