Cam-Track Piston Assembly With Edge Stabilization
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Solution Overview
Problem
Conventional piston arrangements in internal combustion engines face challenges in stabilizing the piston movement and power transfer efficiency due to the lack of effective mechanisms for stabilizing the piston in directions perpendicular to the track plane and efficient load transfer between the piston and the track.
Innovation Solution
The introduction of a stabilizing element with a contact surface that engages the edge surface of the track, combined with a bearing system featuring a roller and a curved bearing surface that provides a partial contact patch, enhances piston stability and load transfer efficiency by allowing the roller to rotate freely while maintaining engagement with the cam surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional piston arrangement without a stabilizing element is used, then the structure is simpler, but the piston stability in directions perpendicular to the track plane is insufficient
Solution Approach 1:
The piston assembly is segmented into multiple functional components: the piston head for power transfer, the stabilizing element for lateral stabilization, and the follower for cam surface engagement. This segmentation allows each component to perform its specific function independently, improving overall piston stability without creating a monolithic complex structure.
Solution Approach 2:
The stabilizing element acts as an intermediary component between the piston head and the track. It engages with the edge surface of the track to provide lateral support and stabilization, mediating the interaction between the piston and track while allowing the piston to maintain stable reciprocating motion perpendicular to the track plane.
2Power
If a follower running on the cam surface is used, then power transfer is achieved, but load transfer efficiency between piston and track is insufficient
Solution Approach 1:
The follower incorporates a roller element that rotates as it moves along the cam surface. This curved rolling contact replaces sliding friction with rolling friction, significantly improving load transfer efficiency and reducing wear between the piston assembly and the track while maintaining effective power transfer.
3Strength
If the engine casing is assembled before coupling piston and track, then the structure is more rigid, but the assembly process becomes more difficult
Solution Approach 1:
The engine assembly process is segmented into distinct stages: first coupling the piston assembly with the track assembly outside the casing, then installing this pre-assembled unit into the engine casing. This segmentation of the assembly process simplifies manufacturing by allowing components to be prepared and tested separately before final integration, reducing assembly difficulty while maintaining casing rigidity.
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 improves piston stability and load transfer efficiency, reducing bearing whirl and enabling efficient power transfer between the piston and the track, while also simplifying the assembly process of internal combustion engines by allowing the engine casing to be assembled around the piston and track after they are coupled.
Implementation Method 1
a bearing system featuring a roller and a curved bearing surface that provides a partial contact patch, enhances piston stability and load transfer efficiency by allowing the roller to rotate freely while maintaining engagement with the cam surface
Implementation Method 2
a stabilising element is connected to the piston, the stabilising element extending below the piston head and comprising a contact surface which engages the edge surface of the track. The stabilising element acts to stabilise the piston a direction perpendicular to the plane of the edge surface of the track
Data Source
AI summary
A piston arrangement including a track and a piston moveable within a cylinder; wherein the track is adapted to rotate relative to the cylinder about an axis of rotation and has a cam surface and an edge surface extending away from the cam surface; wherein the piston is coupled to the track by a follower running on the cam surface; wherein the cam surface is shaped such that, as the track moves relative to the cylinder, the piston head moves in reciprocating motion within the cylinder in accordance with the path of the cam surface; wherein a stabilising element is connected to the piston, the stabilising element extending below the piston head and comprising a contact surface which engages the edge surface of the track.