Cam Damper Oil Circulation Using Centrifugal Force
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Solution Overview
Problem
The existing damper devices face inefficiencies in oil flow and circulation, leading to increased friction loss and reduced fuel efficiency due to the need for an oil pump to move oil by pressure.
Innovation Solution
A damper device design incorporating an input shaft member, an output shaft member, a cam mechanism with rollers, and an urging member, featuring supply and discharge passages that utilize centrifugal force and inertial force to efficiently circulate oil between the input and output cams, eliminating the need for an oil pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an oil pump is used to move oil by pressure, then oil flow efficiency is improved, but friction loss increases and fuel efficiency deteriorates
Solution Approach 1:
The invention extracts and eliminates the oil pump from the system by utilizing the centrifugal force generated by the rotating input shaft member to circulate oil naturally through the damper device, thereby removing the source of friction loss while maintaining oil flow efficiency
Solution Approach 2:
The damper device utilizes its own rotational motion to generate centrifugal force that circulates oil through the system, making the oil circulation self-powered and eliminating the need for an external oil pump
2Productivity
If an oil pump is used to move oil by pressure, then oil circulation is improved, but device complexity increases
Solution Approach 1:
The invention removes the oil pump component from the damper device, simplifying the overall structure while maintaining effective oil circulation through centrifugal force generated by the rotating input shaft member
Solution Approach 2:
The input shaft member serves dual functions: transmitting rotational driving force and generating centrifugal force for oil circulation, thereby eliminating the need for a separate oil pump component
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables efficient oil flow and circulation within the damper device, reducing friction loss and improving fuel efficiency by leveraging centrifugal and inertial forces to distribute oil to bearings, mimicking the effect of a screw pump.
Implementation Method 1
supply passages (9) extending through the flange portion (s3) of the crankshaft (S) and the input side cam (4)... capable of gathering oil... outlet (9b) formed at the receiving portion (4c)
Implementation Method 2
leveraging centrifugal and inertial forces to distribute oil to bearings
Data Source
AI summary
A damper device includes: an input shaft member to which a driving force from a crankshaft of an internal combustion engine is input, the input shaft member including a flange portion of the crankshaft; an output shaft member capable of outputting the driving force transmitted from the input shaft member; an input side cam and an output side cam respectively connected to the input shaft member and the output shaft member; rolling members pivotable on the input side cam; and an urging member urging the output side cam so as to cause it to abut the rolling members, wherein the input side cam has receiving portions recessed so as to receive the rolling members, and supply passages extending through the flange portion and the input side cam has: inlets communicated with an oil sump space; and outlets formed at the receiving portion of the input side cam.