Rail Vehicle Coupling Protective Cap Pivot Axis Kinematics
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Solution Overview
Problem
Existing coupling devices for rail vehicles suffer from poor sealing and high wear on sealing elements due to unfavorable kinematic conditions when the protective cap is opened or closed, leading to complex designs and increased installation space requirements.
Innovation Solution
The pivot axis of the actuating element is arranged near the contact surface between the protective cap and the interface unit, allowing for a predominantly perpendicular movement of the protective cap, which simplifies the design and kinematics, reducing wear and ensuring effective sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pivot axis of the actuating element is offset far to the rear perpendicular to the contact surface, then a high translation of movement is achieved and the protective cap can be moved quickly out of the linear movement space, but the movement of the protective cap is mainly directed tangentially to the sealing surface resulting in poor sealing and high wear on sealing elements
Solution Approach 1:
The patent changes the parameter of pivot axis position from being offset far to the rear to being arranged in the vicinity of the contact surface. This parameter change fundamentally alters the movement trajectory, transforming it from primarily tangential to predominantly perpendicular to the contact surface, thereby resolving the contradiction between speed and sealing quality
Solution Approach 2:
The patent inverts the conventional approach by placing the pivot axis near the contact surface rather than far from it. This inversion causes the protective cap to move perpendicular to the contact surface during opening and closing, which is the opposite of the conventional tangential movement, thereby achieving both rapid movement and effective sealing
2Device complexity
If the protective cap is arranged on the housing of the cable coupling half to be pivoted about a fixed axis, then the design is simple, but the relative movement has a strong component tangential to the contact surface causing wear and making it complex to ensure sufficient sealing force
Solution Approach 1:
The patent changes the critical parameter of pivot axis position from being far from the contact surface to being in the vicinity of the contact surface. This parameter change transforms the movement direction from tangential to perpendicular, which simplifies the sealing force requirement while maintaining design simplicity
Solution Approach 2:
The actuating element with the pivot axis near the contact surface automatically generates the correct movement trajectory without requiring complex control mechanisms. The geometry of the arrangement itself ensures that the protective cap moves perpendicular to the contact surface during actuation, making the system self-regulating and simple to design
3Ease of operation
If the protective cap is held pivotably on both sides on a lever arm articulated on the housing, then the protective cap can be moved, but the design requires very long lever arms and therefore comparatively large amounts of installation space
Solution Approach 1:
The patent extracts the essential function of protective cap actuation from the long lever arm mechanism and concentrates it into a compact arrangement where the pivot axis is positioned near the contact surface. This extraction eliminates the need for very long lever arms while maintaining the protective cap's actuation capability, thereby reducing installation space requirements
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 enables a simple, compact design with favorable kinematic conditions for opening and closing the protective cap, achieving good sealing and low wear on sealing elements, while allowing for rapid removal from the interface unit's movement space.
Implementation Method 1
the actuating element is mounted pivotably about a pivot axis on the carrier device
Data Source
Figure 1~2
Figure 3~4
AI summary
The coupling device (1) has a carrier device, an interface unit (2) with connecting elements and a protective cap (4) for an access point (2.1) connected to an operating device (6) with an operating element (6.1). The turning axis of the operating element is arranged so that the turning motion of the protective cap has a component perpendicular to the contact surface (2.3) between the protective cap and the interface unit.