Power Unit Oil Tank Anteroposterior Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power units with dry sump type lubricating devices face challenges in reducing size and pump loss due to the protrusion of the oil tank, which interferes with other components and enlarges the unit case.
Innovation Solution
The oil tank is positioned anteriorly outside the unit case cover, close to the crank chamber, and the hydraulic control device is placed similarly, allowing for a compact arrangement that avoids lateral expansion and shortens oil passages, thereby reducing pump loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the oil tank is disposed laterally outwardly from the unit case to avoid the shift chamber and crank chamber, then the oil tank can ensure sufficient capacity, but the entire power unit is enlarged
Solution Approach 1:
The oil tank is repositioned from a lateral arrangement to an anteroposterior arrangement outside the unit case cover. This dimensional change allows the oil tank to be positioned in the longitudinal direction rather than expanding laterally, thereby maintaining sufficient capacity while avoiding the increase of the overall power unit footprint.
Solution Approach 2:
The oil tank is extracted from the traditional lateral positioning within or adjacent to the unit case and repositioned to an independent location on the anteroposterior outside of the unit case cover. This extraction allows the oil tank to be optimally positioned without interfering with the shift chamber and crank chamber, solving the spatial conflict.
2Reliability
If the oil tank protrudes laterally outwardly from the unit case cover, then the oil tank can avoid interference with the shift chamber, but the pump loss increases due to longer oil passages
Solution Approach 1:
By changing the positioning dimension of the oil tank from lateral to anteroposterior outside the unit case cover, the patent achieves both interference avoidance and reduced passage length. The oil tank is located close to the crank chamber in the longitudinal direction, shortening the oil passages while maintaining separation from the shift chamber.
3Volume of moving object
If the oil tank is positioned on the anteroposterior outside of the unit case cover close to the crank chamber, then the power unit can be downsized, but the oil tank capacity must be sufficient
Solution Approach 1:
The oil tank is positioned in the anteroposterior direction outside the unit case cover, utilizing the longitudinal space rather than lateral space. This dimensional approach allows the oil tank to achieve sufficient capacity in a compact footprint, enabling power unit downsizing without compromising oil storage requirements.
Data Source
AI summary
A power unit provided with a dry sump type lubricating device includes a power unit case that is covered in part by a power unit case cover and is divided into a front unit case and a rear unit case. The power unit also includes a crankshaft rotatably supported by a crank chamber that is formed by the power unit case and a shift shaft rotatably supported by a transmission chamber that is provided adjacent to the crank chamber. The power unit also includes an oil tank disposed on the crank chamber side of an anteroposterior outside surface of the power unit case cover and a hydraulic control device for controlling a shift clutch, disposed on the transmission chamber side of the anteroposterior outside surface of the power unit case cover.