Gearbox Selection Actuator Lever for Precise Clutch Engagement
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Solution Overview
Problem
Existing internal control systems for parallel shaft gearboxes face inaccuracies in selection feedback, particularly when clutches are off-center relative to passage fingers, leading to unreliable engagement.
Innovation Solution
A lever mechanism is introduced to drive the interlocking key, fixed by one end to a bidirectionally rotating actuating axis, which mechanically acts on the passage carriage via a ball joint, eliminating the need for a return spring and ensuring precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a return spring is used to drive the interlocking key in the opposite direction, then the selection return force is provided, but the positioning precision deteriorates when clutches are off-center relative to shift fingers
Solution Approach 1:
The patent replaces the spring-based mechanical system with a bidirectionally rotating actuating shaft system. The actuating shaft, driven by an electric motor through a lever mechanism, provides controlled rotational movement in both directions to position the interlocking key precisely, eliminating the positioning errors caused by spring force variations with off-center clutches.
Solution Approach 2:
The patent changes the control parameter from passive spring force to active bidirectional rotational control. The actuating shaft can rotate precisely in both directions to positioning marks, allowing the system to compensate for off-center clutch positions and maintain accurate engagement regardless of the clutch position relative to shift fingers.
2Ease of operation
If a solenoid actuated piston is used to rotate the interlocking key, then the selection action is provided, but the system complexity increases
Solution Approach 1:
The patent extracts the complex solenoid actuated piston mechanism and replaces it with a simpler bidirectionally rotating actuating shaft system. The shaft can be rotated in both directions by a motor to achieve the same selection function, reducing the number of components and simplifying the overall system architecture.
Solution Approach 2:
The bidirectionally rotating actuating shaft serves multiple functions: it can rotate in both directions to select different gear lines, it provides precise positioning through engagement with positioning marks, and it eliminates the need for separate return spring mechanisms. This multi-functional component reduces overall system complexity while maintaining ease of operation.
3Manufacturing precision
If the interlocking key is driven by a bidirectionally rotating actuating shaft through a lever mechanism, then the positioning precision is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a lever mechanism as an intermediary between the bidirectionally rotating actuating shaft and the interlocking key. This lever, fixed to the shaft, translates the shaft's bidirectional rotation into precise angular positioning of the key, enabling accurate engagement while maintaining a relatively simple mechanical transmission structure.
Data Source
Figure 1A~1B
Figure 2~2B
Figure 3A~4B
AI summary
An internal control selection actuator for a gearbox comprising an interlocking key (6) rotating with a control axis (2) for selecting one of at least two transmission lines by simultaneously locking the unselected lines and rotationally secured to a switching carriage (2), characterised in that the interlocking key (6) is rotated by a lever (11) that is fixed via a first end to an actuation axis (1) rotating in both directions and that mechanically acts on the carriage (2) via its second end.