Fuel Injector Mounting Assembly Cylinder Bore Deformation
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Solution Overview
Problem
Opposed-piston engines face challenges in mounting fuel injectors on the cylinder block without causing deformation of the cylinder bore, which can lead to reduced durability and operational lifetime due to the lack of a cylinder head for traditional clamping arrangements.
Innovation Solution
A fuel injector mounting assembly comprising a sleeve, a clamp, threaded fasteners, and a spanner nut is used to secure the fuel injector to the cylinder block, distributing clamping forces to minimize axial pressure on the cylinder wall and prevent deformation, while maintaining operative communication with the cylinder bore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional clamping arrangement is used to mount the fuel injector on the cylinder block, then the fuel injector can be securely retained, but the cylinder bore becomes deformed and distorted
Solution Approach 1:
A mounting bracket serves as an intermediary component between the fuel injector and the cylinder block. The bracket includes a clamping arrangement that secures the fuel injector while the bracket itself is mounted to the cylinder block at locations that do not directly load the cylinder bore, thereby preventing deformation of the bore while still providing secure retention of the injector.
2Productivity
If the fuel injector is mounted close to the cylinder wall for direct side injection, then fuel can be injected directly into the combustion chamber, but the cylinder wall experiences excessive axial force causing deformation
Solution Approach 1:
The mounting bracket distributes the clamping forces in multiple dimensions rather than concentrating them in a single axial direction. By mounting the bracket at strategic locations on the cylinder block and using a distributed clamping arrangement, the forces are redirected away from the cylinder wall, preventing axial deformation while maintaining the injector's position for effective side injection.
3Device complexity
If a simple mounting arrangement is used for the fuel injector, then the device complexity is reduced, but the cylinder bore becomes distorted and scuffing occurs
Solution Approach 1:
The mounting system is segmented into distinct functional components: a mounting bracket that attaches to the cylinder block, a clamping arrangement that secures the fuel injector, and mounting locations that are positioned to avoid loading the cylinder bore. This segmentation allows each component to perform its specific function while collectively preventing bore deformation and scuffing.
Data Source
AI summary
A fuel injector mounting assembly in an opposed-piston engine allows for mounting of a fuel injector in a cylinder block without significantly deforming the wall of the cylinder into which the injector is configured to deliver fuel. The fuel injector mounting assembly includes a clamping arrangement to clamp the fuel injector to the cylinder block, an elongate tubular sleeve that sheathes a nozzle portion of the fuel injector, and a spanner nut attached to the elongate tubular sleeve. Clamping loads applied to retain the fuel injector in the cylinder block are controlled by the spanner nut.