Separable Engine Head Cover for Injector Harness Maintenance
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Solution Overview
Problem
Existing engine head cover structures face challenges in sealability and workability due to semispherical penetration grooves, which complicate the detachment and attachment of components like injector harnesses and fuel pipes, affecting maintenance and assembly efficiency.
Innovation Solution
A separable head cover design with a lower cover body and upper cover body, featuring a fuel pipe and relay connector for fuel supply and power relay, respectively, along with a harness guide to manage the injector harness, ensuring secure sealing and improved accessibility during maintenance without compromising seal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semispherical penetration grooves are formed at the connection between cover bodies to vertically secure the injector harness or fuel pipe, then the injector harness and fuel pipe can be securely positioned, but the sealability is compromised and maintenance workability deteriorates
Solution Approach 1:
The head cover is divided into an upper cover body and a lower cover body that can be detached from each other. This segmentation allows the injector harness to remain secured in the lower cover body during maintenance, while the upper cover body can be removed for access to the valve gear mechanism, thereby improving maintenance workability without compromising the secure positioning of the injector harness.
Solution Approach 2:
The lower cover body acts as an intermediary structure that permanently secures the injector harness and fuel pipe with semispherical penetration grooves, while the upper cover body can be detached. This intermediary arrangement allows the harness and pipe to be securely positioned in the lower cover body without interfering with the maintenance operations on the upper cover body.
2Ease of operation
If the head cover is made separable into upper and lower cover bodies for maintenance access, then maintenance workability is improved, but the sealability at the connection interface becomes problematic
Solution Approach 1:
The head cover is segmented into detachable upper and lower cover bodies connected by bolt holes. This segmentation provides maintenance accessibility by allowing the upper cover body to be removed, while the connection interface maintains sealability through properly designed bolt-hole arrangements that ensure proper sealing when reassembled.
3Ease of repair
If the upper cover body is detached and reattached after maintenance, then maintenance operations can be performed, but the workability is reduced due to the need to remove and resecure the injector harness and fuel pipe
Solution Approach 1:
The head cover is segmented into upper and lower cover bodies, with the injector harness and fuel pipe permanently secured in the lower cover body using semispherical penetration grooves. This allows the upper cover body to be detached and reattached without disturbing the harness or pipe, significantly reducing the time and complexity of maintenance operations.
Solution Approach 2:
The lower cover body serves as an intermediary structure that permanently houses the injector harness and fuel pipe, allowing the upper cover body to be independently removed and reattached for maintenance operations without affecting the harness or pipe installation.
Data Source
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AI summary
An engine includes a head cover covering an upper part of a cylinder head to accommodate a valve gear mechanism and an injector. The head cover is separatable into a lower cover body and an upper cover body detachable from and attachable to the lower cover body. The lower cover body includes a fuel pipe and a relay connector. Through the fuel pipe, fuel is supplied to the injector. The fuel pipe penetrates through the lower cover body. The relay connector is configured to relay power supply from outside the head cover. The relay connector is attached to the lower cover body. One end side of an injector harness disposed in the head cover is coupled to a terminals portion of the injector. Another end side of the injector harness is coupled to the relay connector.