Gear Coupling Guide Rod Structure for Low-Friction Shifting
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Solution Overview
Problem
Existing coupling devices in electric drive systems experience unwanted residual torque and frictional forces during gear engagement and disengagement, leading to inefficiencies and potential mechanical stress.
Innovation Solution
A gearbox with a coupling device featuring a shift fork and guide rod system, where the shift fork is coupled to a guide rod with sliding bushings and stop sleeves, allowing precise, low-friction guidance and limiting movement to axial directions, using an electromechanical actuator with a spindle for rotationally controlled gear engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the shift fork is guided by a guide rod with sliding bushings, then the guidance precision and movement control are improved, but the device complexity increases due to additional components
Solution Approach 1:
The sliding bushings are integrated into the guide rod structure, with the stop sleeves nested on the guide rod between the shift fork and sliding bushings. This nested arrangement provides precise guidance functionality while minimizing the number of separate components, thereby reducing overall device complexity.
2Manufacturing precision
If stop sleeves are added to limit guide rod movement, then the movement control and positioning accuracy are improved, but the manufacturing complexity increases
Solution Approach 1:
The stop sleeves are merged with the guide rod as integral components, where the stop sleeves are directly formed on the guide rod body. This integration eliminates the need for separate stop components and simplifies the manufacturing process while maintaining precise positioning control.
3Stability of the object's composition
If the shift fork is rigidly connected to the guide rod, then the structural stability is improved, but the frictional forces and mechanical stress increase
Solution Approach 1:
The sliding bushings act as intermediary elements between the guide rod and the shift fork assembly. These bushings provide a low-friction interface that allows the rigid connection to maintain structural stability while minimizing harmful frictional forces through the intermediate bearing surface.
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 provides precise and low-friction gear coupling and decoupling, minimizing unwanted torque and frictional forces, resulting in a structurally simple and stable drive system.
Implementation Method 1
low-friction guidance
Implementation Method 2
sliding bushings
Implementation Method 3
electromechanical actuator with a spindle
Implementation Method 4
limit the movement of the guide rod
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a coupling device (10) for coupling and/or uncoupling a gearwheel (21) to or from a shaft (14) and to a transmission, in particular for an electrical drive assembly, comprising a corresponding coupling device (10).