Segmented Piston Ring Installation Tool for Opposed-Piston Engines
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Solution Overview
Problem
Conventional piston ring compression tools are unable to efficiently install piston assemblies in opposed-piston engines due to the lack of unrestricted access, as the pistons must be installed from the crankcase area, and existing tools interfere with the cylinder block main bearing journals or require assembly of the connecting rod after compression, leading to increased assembly times and wear.
Innovation Solution
The development of specialized piston assembly installation tools with cutouts to accommodate the cylinder block main journal saddles, allowing for installation from the crankcase area, and featuring channels and bumpers to facilitate the insertion and compression of piston rings without interfering with the engine's main bearing journals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional compression tools are used to install piston assemblies, then the piston rings can be compressed and installed, but the tools interfere with the cylinder block main bearing journals or require assembly of the connecting rod after compression, leading to increased assembly times and wear
Solution Approach 1:
The tool body is segmented with cutouts that create windows on either side of the cylinder bore, allowing the tool to be positioned and removed independently from the main bearing journals. This segmentation enables the tool to navigate around the journals rather than interfering with them, solving both the interference problem and the tool removal problem.
Solution Approach 2:
The tool incorporates channels that extend from the top surface down toward the bottom surface, creating a three-dimensional pathway. This dimensional extension allows the tool to guide the piston assembly through a controlled path while providing clearance from the main bearing journals, enabling tool removal without interference.
2Ease of operation
If the scallops on the main journals are increased to provide clearance for conventional tools, then tool installation becomes possible, but the crankshaft loads on the main bearings increase
Solution Approach 1:
The tool features localized cutouts positioned specifically on either side of the cylinder bore, creating windows that provide just enough clearance for tool installation without requiring increased scallop dimensions. This localized modification allows tool access while maintaining the original crankshaft load characteristics.
3Device complexity
If piston assemblies are installed from the crankcase area in opposed-piston engines, then the engine structure is simplified, but unrestricted access for conventional compression tools is lost
Solution Approach 1:
The tool is designed with multi-functional capabilities: it provides piston ring compression, guides the piston assembly into the cylinder bore, and can be removed without interference from the connecting rod or main bearing journals. This universal design allows the same tool to handle multiple operations in the crankcase access configuration.
Solution Approach 2:
The tool body is divided into segments with cutouts that create windows on either side of the cylinder bore. This segmentation allows the tool to be positioned in the crankcase area and provides the necessary clearance to navigate around the main bearing journals while maintaining access for piston installation.
Data Source
AI summary
Piston assembly installation tools are disclosed, each installation tool configured for installation of the piston assembly into an opposed-piston engine from a crankcase area of the engine. The installation tools comprise cutouts to account for cylinder block main journal saddles located on either side of a cylinder bore where the piston assembly may be installed.