Auxiliary Machine Drive Layout for Compact Engine Rear
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Solution Overview
Problem
Existing auxiliary machine drive devices for engines, when positioned on the rear end portion or surface, tend to increase the engine's size and weight due to offset chain configurations, which complicates the compact layout and efficiency.
Innovation Solution
The proposed auxiliary machine drive device optimizes the layout by strategically placing the fuel pump, starter, oil pump, intake camshaft, and balancer drive shaft on the rear end surface of the engine body, using a chain configuration that minimizes space occupation and weight, with the fuel pump driven by the crankshaft via a first chain and the intake and exhaust camshafts driven via additional chains, while the balancer shaft is positioned on the tension side of the third chain to reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the auxiliary machine drive device is disposed on the rear side of the engine body with chains offset in the cylinder array direction, then the rotational driving force can be transmitted to the camshaft, fuel pump, and balancer device, but the occupation space in the cylinder array direction increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from an offset chain arrangement in the cylinder array direction to a vertically stacked arrangement. Multiple chains (camshaft drive upper chain, camshaft drive lower chain, balancer shaft drive chain) are arranged in the vertical dimension rather than being offset horizontally, thereby transmitting rotational driving force to the camshaft, fuel pump, and balancer device while minimizing occupation space in the cylinder array direction.
Solution Approach 2:
The patent segments the chain drive system into distinct vertical layers: the camshaft drive upper chain connects the intake camshaft drive sprocket to the first intermediate sprocket, the camshaft drive lower chain connects the fuel pump drive sprocket to the second intermediate sprocket, and the balancer shaft drive chain connects the balancer shaft drive chain sprocket to the second crankshaft sprocket. This segmentation allows each chain to be independently positioned vertically, optimizing space utilization in the cylinder array direction while maintaining effective power transmission to all auxiliary machines.
2Device complexity
If the auxiliary machine drive device is disposed on the rear side of the engine body, then the layout can be compacted, but the engine size and weight may increase
Solution Approach 1:
The patent merges multiple auxiliary machine drive functions into a single compact rear-end arrangement. The crankshaft drive system integrates the camshaft drive upper chain, camshaft drive lower chain, and balancer shaft drive chain in a vertically stacked configuration on the rear end surface of the engine body. This merging of drive functions into a consolidated vertical arrangement achieves layout compactness while avoiding the need for additional lateral space that would increase engine overall dimensions and weight.
Data Source
AI summary
An auxiliary machine drive device for an engine includes a fuel pump including first and second sprockets mounted on a rear end surface of an engine body; a starter disposed below the fuel pump; a drive sprocket and a crankshaft sprocket fixed to a crankshaft; an oil pump including an oil pump sprocket disposed below the drive sprocket; an intake camshaft including an intake camshaft sprocket, and disposed on the upper side of the engine body than the fuel pump; a balancer drive shaft including a balancer shaft sprocket disposed on the exhaust side than the crankshaft and below the crankshaft; a first chain wound between the crankshaft sprocket and a first sprocket; a second chain wound between the intake camshaft sprocket and a second sprocket: and a third chain wound between the drive sprocket, the oil pump sprocket, and the balancer shaft sprocket.