Diesel Engine Supply Pump Maintenance via Flange Passage
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Solution Overview
Problem
Conventional diesel engines face challenges in maintainability, miniaturization, and accurate cam angle measurement due to the fixed pump gear and protruding cam angle sensor, which complicates maintenance and increases engine size.
Innovation Solution
The diesel engine design includes a gear case flange with a passage hole for the pump gear, allowing the supply pump to be detached without removing the pump gear, and a cam angle detection system where the pulser is on the external side of the pump gear, preventing errors in cam angle measurement and reducing overall width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the pump gear is fixed on the drive shaft of the supply pump, then the supply pump cannot be detached unless the pump gear is removed, but this increases maintenance complexity and time
Solution Approach 1:
The invention divides the supply pump assembly into separable components by providing a through-hole in the pump body that allows the pump gear to be accessed independently. This enables the pump gear to be removed and replaced without detaching the entire supply pump from the engine block, effectively segmenting the maintenance process into independent steps.
Solution Approach 2:
The invention extracts the pump gear removal process from the supply pump detachment process by creating a through-hole in the pump body. This allows the pump gear to be taken out independently through the hole, separating the gear replacement operation from the complete pump removal and enabling maintenance without moving the supply pump assembly.
2Measurement precision
If the cam angle sensor is contiguously arranged on the outer circumferential side of the pulser mounted on the cam gear, then the cam angle can be detected, but the cam gear is pushed out causing error in distance measurement and increasing engine size
Solution Approach 1:
The invention relocates the cam angle sensor from a radial arrangement (contiguous to the pulser on the cam gear outer circumference) to an axial arrangement (on the opposite side of the cam gear from the pulser). This dimensional change in sensor placement eliminates the interference between the sensor and cam gear while maintaining measurement capability through the gear thickness.
Solution Approach 2:
The invention uses the cam gear itself as an intermediary structure by providing a through-hole through its thickness. The cam angle sensor is positioned on the opposite side of the cam gear from the pulser, using the gear body as the medium through which the sensor can detect the pulser position without physical interference, thereby eliminating the need for increased engine width.
Data Source
AI summary
Provided are a gear case flange in which a passage hole is provided, a spacer fixed on the gear case flange, a supply pump fixed on the spacer, and a pump gear fixed on the drive shaft of the supply pump, and the pump gear is passed through the passage hole of the gear case flange, whereby the supply pump in a state of being fixed on the spacer can be detached in a state where the pump gear is fixed on the drive shaft.