Rail Vehicle Coupling Spring Protection and Friction Coating
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Solution Overview
Problem
Conventional electrical contact couplings for rail vehicles face issues with synchronicity and protection of spring elements, which can be damaged by external factors like gravel stones, leading to impaired functionality and increased costs due to complex designs and attachment difficulties of friction elements.
Innovation Solution
The electrical contact coupling features pivotally mounted protective flaps with integral pivot bearings and leg springs, providing effective protection and easy assembly, along with a spray elastomer coating for enhanced friction and a projection to prevent unintended closing, ensuring reliable operation and cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spring elements are arranged on the outside of the housing for actuating the protective flap, then the actuating device can be simpler and easier to manufacture, but the spring elements can be damaged or lost by flying gravel or other external factors
Solution Approach 1:
The spring elements are nested within the housing structure, specifically arranged in a recess or cavity of the housing. This nesting approach protects the spring elements from external damage by flying gravel while maintaining the simplicity of the actuating mechanism. The spring elements remain accessible for actuation but are shielded from harmful external factors.
2Reliability
If rubber elements are attached to the protective flap to increase friction and prevent slipping, then synchronous opening is improved, but attachment becomes difficult and requires specially manufactured molded parts with additional tooling costs
Solution Approach 1:
The rubber element is merged with the protective flap by integrating it into the flap's structure. The rubber material is applied directly to the end face of the protective flap through coating or molding processes that combine the friction-enhancing element with the flap itself. This eliminates separate attachment steps and avoids the need for specially manufactured molded parts, reducing tooling costs while maintaining reliable synchronous opening.
Solution Approach 2:
The end face of the protective flap is coated with a rubber material that changes the surface parameters of the flap. This coating approach modifies the friction characteristics of the flap's end face without requiring complex molded parts. The rubber coating can be applied through standard coating processes, simplifying manufacturing while ensuring reliable friction-based synchronous opening.
3Object-affected harmful factors
If the protective flap is curved around multiple axes, then it can better cover and protect the connection elements, but attaching friction elements becomes more difficult and expensive
Solution Approach 1:
Instead of changing the geometric complexity of the protective flap, the solution changes the surface parameters by coating the existing curved surface with rubber material. This coating approach accommodates any flap geometry without requiring specially manufactured molded parts. The rubber coating can be applied to complex curved surfaces using standard coating techniques, maintaining both protection and ease of manufacture.
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 design ensures trouble-free and synchronous opening of protective flaps, effectively protects spring elements from damage, and simplifies attachment of friction elements, preventing unintentional closing and reducing operational costs while maintaining high functionality and safety.
Implementation Method 1
the actuating device has at least one spring element which is at least partially enclosed by the protective flap
Implementation Method 2
a spray elastomer coating for enhanced friction
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to an electrical contact coupling (1) for an automatic middle buffer coupling (2) of a rail vehicle, having: a coupling housing (10), in which an interface unit (12) with a plurality of connection elements (14) is arranged; a protective flap (16) for covering an access opening (18) to the connection elements (14) of the interface unit (12); and an actuating device (20) connected to the protective flap (16) for moving the protective flap (16) between a first position (P1), in which the protective flap (16) covers the access opening (18), and a second position (P2), in which the protective flap (16) exposes the access opening (18), the actuating device (20) having at least one spring element (20a, 20b) which is surrounded at least in regions by the protective flap (16). The invention further relates to a middle buffer coupling (2) for a rail vehicle.