Cam-Track Piston Assembly With Split Casing Layout
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Solution Overview
Problem
Power transfer mechanisms using a piston with a follower coupled to an output shaft by a track with a cam surface are more difficult to assemble compared to conventional mechanisms using a crankshaft and con rod, due to their larger size and complexity.
Innovation Solution
The engine casing is adapted to be assembled around the piston and track after the piston has been coupled to the track, allowing for easier design and assembly by providing a split line between adjacent casing elements, which enables the casing elements to be assembled around the piston and track after they have been coupled, and using a splined or keyed interface between the track and shaft for relative rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power transfer mechanism uses a piston with a follower coupled to an output shaft by a track with a cam surface, then the mechanism can achieve complex motion control, but the assembly process becomes more difficult and time-consuming
Solution Approach 1:
The engine casing is divided into multiple separable casing elements with a split line, allowing the casing to be assembled in segments around the piston and track assembly. This segmentation enables the piston and track to be coupled together externally before being installed within the casing, significantly reducing assembly complexity and time while maintaining the full motion control capabilities of the track-cam mechanism.
2Measurement precision
If a power transfer mechanism uses a piston with a follower coupled to an output shaft by a track with a cam surface, then the mechanism provides precise motion control, but the device size increases and complexity increases
Solution Approach 1:
The mechanism is divided into modular components: the piston assembly, the track assembly, and the casing elements. The track with cam surfaces is assembled as a separate unit with the piston and follower, allowing for precise motion control to be established externally. This modular segmentation reduces the perceived complexity during assembly while maintaining the precise motion control functionality.
Solution Approach 2:
The piston and track assembly is constructed as a nested configuration where the follower is positioned on the piston and engages with the track, which in turn couples to the output shaft. This nested arrangement consolidates multiple functional elements into a compact integrated unit that maintains precise motion control while reducing overall spatial requirements and assembly complexity.
3Ease of manufacture
If the engine casing is assembled around the piston and track after coupling, then the assembly process is simplified, but the casing design requires a split line between casing elements
Solution Approach 1:
The casing is designed with a split line that divides it into separable casing elements. This segmentation allows the piston and track assembly to be constructed independently and then installed within the casing segments, which are subsequently joined together. The added complexity of the split casing structure is offset by the significant simplification of the overall assembly process, as critical components can be assembled externally using full access.
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 approach simplifies the assembly process by providing full access to couple the piston to the track and the track to the shaft, reducing the complexity and time required for assembly while allowing for multiple piston arrangements with reduced components.
Implementation Method 1
a piston with a follower coupled to an output shaft by a track with a cam surface
Data Source
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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.