Starter Motor Nesting in Engine Reentrant Space
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Solution Overview
Problem
The existing internal combustion engine designs leave a reentrant space between the crankcase and cylinder block as dead space, making inefficient use of component placement.
Innovation Solution
The starter motor and reduction gear are positioned side by side in the longitudinal direction, with the driveshaft axis disposed within the width of the gears and inside an imaginary cylindrical plane coaxial with the main shaft, allowing for efficient use of the reentrant space by placing the starter motor and reduction gear in a compact configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the starter motor is disposed in the reentrant space between the crankcase and cylinder block, then space utilization is improved, but the device complexity increases due to compact arrangement requirements
Solution Approach 1:
The starter motor is nested within the reentrant space formed by the crankcase and cylinder block, utilizing the dead space efficiently. The reduction gear is positioned within the width of the large-diameter gear, creating a compact nested arrangement that maximizes space utilization while maintaining functional integrity.
Solution Approach 2:
The starter motor and reduction gear are arranged in the longitudinal direction rather than radially, utilizing the longitudinal dimension of the reentrant space. This dimensional shift allows for efficient packing of components in a previously underutilized spatial dimension.
2Weight of moving object
If the driveshaft axis is disposed within the width of the large-diameter gear and inside the imaginary cylindrical plane, then mass centralization is improved, but the ease of manufacture decreases due to precise positioning requirements
Solution Approach 1:
The driveshaft axis is positioned at a specific location within the reentrant space - within the width of the large-diameter gear and inside the imaginary cylindrical plane coaxial with the main shaft. This localized positioning optimizes mass distribution and achieves centralization while maintaining manufacturability through defined spatial constraints.
Solution Approach 2:
The reduction gear acts as an intermediary element that mediates between the starter motor and the engine components. Its position within the width of the large-diameter gear provides a reference framework that facilitates precise positioning of the driveshaft axis while maintaining ease of assembly.
Data Source
AI summary
An internal combustion engine includes a reduction gear including: at one end thereof, a small-diameter gear in mesh with a one-way clutch gear; and at an opposite end thereof, a large-diameter gear in mesh with a drive gear of a starter motor. The starter motor has a driveshaft disposed below a rotation axis of the reduction gear and within a width of the large-diameter gear as viewed in an axial direction. Accordingly, in the internal combustion engine, it is possible to efficiently dispose components in a reentrant space formed between a crankcase and a cylinder block.