Gear Shift Actuator Linkage With Offset Pin for Full-Stroke Engagement
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Solution Overview
Problem
Existing motion transmission devices for gearbox shift actuators face challenges in maintaining a secure connection between the actuating finger and the dog clutch, particularly at the ends of the stroke, due to excessive travel of the dog clutch, leading to unreliable gear engagement.
Innovation Solution
The introduction of a pin offset on the passage finger, engaged in an oblong opening of the dog clutch, ensures axial displacement of the fork shaft, providing a stable and efficient movement transmission by utilizing a profiled pin and chamfered ends for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a finger is used to engage in a dog clutch for motion transmission, then the gear shift mechanism can be actuated, but the connection between the finger and dog clutch is lost at the extremes of travel due to excessive travel
Solution Approach 1:
The invention introduces a pin that moves in a different dimensional space (along the Y-axis perpendicular to the finger rotation axis) compared to the traditional finger engagement. The pin travels within an oblong opening in the dog clutch, creating a perpendicular motion dimension that maintains continuous contact while the finger rotates, thereby solving the connection loss problem at travel extremes.
Solution Approach 2:
The pin acts as an intermediary element between the rotating finger and the dog clutch. Instead of the finger directly engaging the dog clutch, the pin mediates the motion transfer by moving within the oblong opening, ensuring continuous mechanical connection and reliable force transmission throughout the entire range of motion.
2Adaptability or versatility
If the dog clutch travels a greater distance to accommodate full gear engagement, then complete gear selection is achieved, but the connection quality deteriorates at the ends of the stroke
Solution Approach 1:
By introducing motion along the Y-axis (perpendicular to the finger rotation axis), the system achieves complete gear selection travel without compromising connection quality. The pin's perpendicular travel within the oblong opening allows the dog clutch to move the full distance needed for gear engagement while maintaining continuous contact throughout the stroke.
3Reliability
If a profiled finger is used to maintain contact throughout travel, then connection reliability improves, but the device complexity increases
Solution Approach 1:
The invention divides the motion transmission function into two separate components: the finger responsible for rotation and the pin responsible for linear travel within the oblong opening. This segmentation allows each component to have a simpler, more straightforward geometry while collectively achieving reliable contact maintenance throughout the full range of motion.
Solution Approach 2:
The pin serves as a simple cylindrical intermediary that eliminates the need for complex finger profiling. By placing the pin in the oblong opening, continuous contact is achieved through the pin's linear motion rather than through elaborate finger surface contours, thereby reducing manufacturing complexity.
Data Source
Figure 1~2C
Figure 3~4
Figure 5~6
AI summary
Movement transmission device for a gearbox gear shift actuator, between a rotary drive motor (1), and a fork axis (2) moved axially to engage or disengage a gear of the gearbox, comprising means (6a, 6b) for reducing rotational movement between the output shaft (la) of the motor and a gear shift finger (5) engaged in a dog (3) rigidly connected to the fork axis (2), characterized in that the gear shift finger (5) supports a pin (5c) that is offset in relation to the rotational axis (Y, Y') of the finger (5), the pin (5c) being engaged in an oblong opening (7) of the dog (3), so as to cause the axial movement of the fork axis (2) by moving linearly along the opening (7) under the action of the drive motor (1).