Common Rail Engine Layout for Reduced Side-Mount Space
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Solution Overview
Problem
Conventional engine designs that incorporate a common rail on one side of the cylinder block limit the available space for other components, necessitating a reduction in the occupied area by the common rail region.
Innovation Solution
The engine device includes a common rail attached to one lateral side of the cylinder block that pivotally supports a crankshaft, with a flywheel housing positioned on the opposite side, and integrates the intake manifold and exhaust-gas recirculation device to protect and optimize the layout of components, including the placement of the fuel feed pump and coolant pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the common rail is disposed on one side of the cylinder block, then the fuel supply function is achieved, but the space for attaching other members is limited
Solution Approach 1:
The common rail is configured to extend in the longitudinal direction of the crankshaft, utilizing the length dimension rather than occupying lateral space. This dimensional reorientation allows the common rail to maintain its fuel supply function while reducing the footprint on the cylinder block side, thereby improving layout flexibility for other components.
2Quantity of substance
If the common rail occupies one side of the cylinder block, then the fuel storage function is achieved, but the area occupied is reduced
Solution Approach 1:
The common rail leverages the longitudinal dimension of the crankshaft to accommodate fuel storage, extending along the crankshaft center rather than spreading laterally. This allows sufficient fuel capacity to be maintained while minimizing the occupied area on the cylinder block side.
3Ease of operation
If components are exposed on the engine exterior, then accessibility is improved, but vulnerability to damage increases
Solution Approach 1:
Critical components such as the fuel feed pump and connectors are integrated with the intake manifold and EGR device, which serve as protective housings. This merging provides physical protection against external damage while maintaining functional accessibility for maintenance and operation.
Data Source
AI summary
An engine includes a common rail attached to one side portion of a cylinder block that pivotally supports a crankshaft in a rotatable mariner, the one side portion extending along a crankshaft center, and the common rail being configured to supply a fuel to the engine. A flywheel housing that accommodates a flywheel that is rotated integrally with the crankshaft is disposed in one side portion out of opposite side portions of the cylinder block intersecting the one side portion. One end portion of the common rail is disposed above the flywheel housing.