Positive Gearshift Unit Control via Rotational Speed Touch-Point
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Solution Overview
Problem
The engagement procedure of asymmetrical positive gearshift units is inefficient, leading to potential repelling of coupling halves due to incorrect rotation direction, resulting in wear and reduced smoothness.
Innovation Solution
A method for controlling a positive gearshift unit involves setting a touch-point along a rotational speed difference profile after crossing a synchronous rotational speed, utilizing beveled coupling and catch toothing to ensure proper meshing, with active control of the engine to set a two-digit rotational speed difference and flattened gradient, preventing repelling and ensuring smooth engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engagement procedure is performed without active rotational speed control, then the control system is simpler, but the coupling halves may repel due to incorrect rotation direction causing wear and reduced smoothness
Solution Approach 1:
The patent actively controls the rotational speed difference parameter during engagement, setting it to specific values (e.g., 25-75 rpm) at the touch-point to ensure proper meshing direction. This parameter control prevents repelling and wear while maintaining engagement smoothness.
Solution Approach 2:
The control system monitors the rotational speed difference between coupling halves and adjusts the engine output accordingly. This feedback mechanism ensures the rotational speed difference follows the target curve, preventing incorrect rotation direction and ensuring reliable engagement.
2Reliability
If the rotational speed difference is not actively controlled, then the control system is simpler, but the engagement procedure causes increased wear on the gearshift unit
Solution Approach 1:
The patent sets specific rotational speed difference parameters during engagement, particularly a two-digit value (25-75 rpm) at the touch-point. This controlled parameter ensures proper meshing conditions that minimize wear on the beveled toothing while maintaining engagement durability.
3Productivity
If the engagement procedure uses high rotational speed difference, then the engagement is faster, but the load on the gearshift unit increases
Solution Approach 1:
The patent optimizes the rotational speed difference parameter to a specific range (25-75 rpm) at the touch-point. This parameter setting achieves sufficiently fast engagement while keeping the load on the gearshift unit low, as confirmed by the explicit statement that the engagement procedure can be designed to maintain low load.
Data Source
AI summary
A method for controlling a positive gearshift unit includes, in an engagement procedure, a coupling element, which is connected to a first coupling half and which has a beveled coupling toothing, is brought into engagement with a blocking element, which has a blocking toothing and which is connected to a second coupling half, and is brought into engagement with a catch element, which is connected to the second coupling half, which has a beveled catch toothing, and which is able to move circumferentially with respect to the blocking element. In the engagement procedure, a touch-point is set which comes after a crossing of a synchronous rotational speed in a rotational speed difference profile.