Common Rail Placement Above Flywheel Housing for Compact Engine Layout
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Solution Overview
Problem
Conventional engine designs face challenges in reducing the space occupied by the common rail disposed on one side of the cylinder block, limiting the layout flexibility for other components.
Innovation Solution
The engine device incorporates a common rail attached to one lateral side of the cylinder block that pivotally supports the crankshaft, with a flywheel housing positioned on the opposite side, and integrates a fuel feed pump below an exhaust-gas recirculation device to optimize space utilization and protect components from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common rail is disposed on one lateral side portion of the cylinder block, then the fuel supply function is achieved, but the area occupied by the common rail increases, limiting space for other components
Solution Approach 1:
The common rail is positioned to extend in the longitudinal direction of the cylinder block, utilizing the length dimension rather than occupying lateral space. This dimensional reorientation allows the common rail to achieve its fuel supply function while minimizing the area occupied on the lateral side portion of the cylinder block.
Solution Approach 2:
One end portion of the common rail is disposed above the flywheel housing, which is predetermined in the design. This preliminary positioning allows for optimized space utilization by coordinating the common rail layout with the pre-established flywheel housing position, thereby reducing the area occupied while maintaining functional requirements.
2Reliability
If the common rail is disposed on one lateral side portion of the cylinder block, then the fuel supply function is achieved, but the layout flexibility for other members is reduced
Solution Approach 1:
By orienting the common rail along the longitudinal direction of the cylinder block rather than extending it laterally, the design frees up lateral space for other components. This dimensional change restores layout flexibility while maintaining the common rail's fuel supply function.
Solution Approach 2:
The common rail's end portion is preliminarily positioned above the flywheel housing, creating a coordinated layout that optimizes space for multiple components. This preliminary action enhances layout flexibility by establishing a harmonious arrangement between the common rail and other engine members.
3Area of stationary object
If the fuel feed pump is disposed below the exhaust-gas recirculation device, then space utilization is optimized, but component protection from foreign objects is reduced
Solution Approach 1:
The fuel feed pump is preliminarily positioned below the exhaust-gas recirculation device, optimizing space utilization. However, the exhaust-gas recirculation device itself serves as a protective barrier, preliminarily shielding the fuel feed pump from foreign objects that might fall from above, thus resolving the protection concern while maintaining space optimization.
Data Source
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AI summary
An engine 1 includes a common rail 16 attached to one side portion 302 of a cylinder block 6 that pivotally supports a crankshaft in a rotatable manner, the one side portion 302 extending along a crankshaft center, the common rail 16 being configured to supply a fuel to the engine 1. A flywheel housing 7 that accommodats a flywheel that is rotated integrally with the crankshaft is disposed in one side portion out of opposite side portions of the cylinder block 6 intersecting the one side portion 302. One end portion of the common rail 16 is disposed above the flywheel housing 7. Also a cooling pump 21 is disposed on a side portion 312 of the cylinder block 6, whereby a coolant passage 610 in the cylinder block 6 is providing a concave region 611 for the electrical connector 601a of the common rail 16.