Rail Vehicle Buffer Assembly With Centering Tip and Threaded Flange
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Solution Overview
Problem
Existing buffers for rail vehicles with a buffer sleeve and piston rod are difficult to assemble due to the need for rotation from two sides, making the process cumbersome and prone to misalignment.
Innovation Solution
A buffer design featuring a connection flange with an outer thread interacting with an inner thread in the buffer sleeve, assisted by a centering tip element for precise coaxial alignment, and anti-rotation securing means like clamping shoes to secure the jointed head and piston rod, allowing for one-sided assembly without rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bayonet connection or centering flange with multiple securing screws is used between the buffer sleeve and jointed head, then the connection is secure, but the assembly becomes difficult and requires rotation from two sides
Solution Approach 1:
The connection system is divided into two functional parts: a centering tip element for alignment and an outer thread for secure fastening. This segmentation allows the assembly process to be simplified (single-sided access) while maintaining connection security through the threaded engagement.
Solution Approach 2:
The centering tip element acts as an intermediary component that facilitates the assembly process by providing coaxial alignment between the buffer sleeve and jointed head before the final threaded connection is made. This mediator enables easy assembly from one side while ensuring proper positioning.
2Stability of the object's composition
If multiple securing screws distributed over the outside are used to attach the centering flange, then the connection is stable, but the assembly process becomes cumbersome and time-consuming
Solution Approach 1:
The complex multi-screw securing system is extracted and replaced with a simpler threaded connection. The essential function of secure attachment is maintained through the outer thread engagement, while the time-consuming aspect of distributing and tightening multiple screws is eliminated.
Solution Approach 2:
The connection method changes from a multi-parameter system (multiple screws at different positions) to a single-parameter system (threaded engagement). This parameter reduction simplifies the assembly process significantly while maintaining the necessary connection stability through proper thread design.
3Manufacturing precision
If the buffer sleeve and jointed head are connected by rotating from two sides, then proper alignment can be achieved, but the assembly becomes difficult and requires complex positioning
Solution Approach 1:
The centering tip element serves as a positioning intermediary that automatically establishes coaxial alignment when inserted into the buffer sleeve. This eliminates the need for complex two-sided rotation and positioning operations, as the centering tip self-aligns the components during assembly from a single side.
Solution Approach 2:
The centering tip element performs the alignment function preliminarily, before the final threaded connection is made. By establishing coaxial positioning in advance through the centering tip, the subsequent threading operation becomes straightforward and does not require complex positioning or rotation from multiple sides.
Data Source
AI summary
Buffer, in particular for a rail vehicle, includes a buffer sleeve, forming a pressure chamber, a jointed head securable to this sleeve on the face side by a connection flange, and a buffer piston rod, mounted opposite in the buffer sleeve to be displaceable longitudinally. The jointed head is connectable in a jointed manner to the rail vehicle, while the buffer piston rod is preferably connectable to a coupling head. The connection flange has an outer thread on its outer casing, screwed to an inner thread in a hole of the buffer sleeve to form a releasable connection of the jointed head with the buffer sleeve. The connection flange preferably has on the front side a centering tip element before the outer thread, which is slid or pressed essentially free of play into the hole of the buffer sleeve.