Roller Lifter Inertial Mass Layout for Swing Suppression
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Solution Overview
Problem
Roller lifters experience tilting and swinging motions during reciprocating movement, leading to lifter-hitting noise due to collisions with the inner walls of the lifter guide.
Innovation Solution
A roller lifter design featuring a cylindrical lifter body with facing portions, a rotation stopper, a shaft member, and an inertial mass positioned below the lifter body, which stabilizes the lifter's center of gravity and prevents tilting by increasing its moment of inertia, while maintaining a structure that allows easy assembly and simplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the roller lifter structure is simplified without additional components, then the device complexity is reduced, but the roller lifter tilts and swings during reciprocating movement causing lifter-hitting noise
Solution Approach 1:
The patent changes the physical parameter of mass distribution by adding an inertial mass below the lifter body. This modifies the moment of inertia parameter to suppress swinging motions during reciprocating movement, resolving the contradiction between simple structure and reliable operation without complex additional components
2Device complexity
If the roller lifter uses a conventional structure without inertial mass, then the device complexity is low, but the roller lifter collides with the inner wall of the lifter guide generating noise
Solution Approach 1:
The patent modifies the mass distribution parameter by introducing an inertial mass positioned below the lifter body. This parameter change increases the moment of inertia, which suppresses tilting and swinging motions that cause collisions with the lifter guide inner wall, thereby eliminating lifter-hitting noise while maintaining structural simplicity
3Stability of the object's composition
If the roller lifter adds an inertial mass to suppress swinging motions, then the stability during reciprocating movement is improved, but the weight of the moving object increases
Solution Approach 1:
The patent addresses the weight-stability contradiction by strategically positioning the inertial mass in the vertical dimension below the lifter body. This spatial arrangement optimizes the moment of inertia to suppress swinging motions while minimizing the impact on overall weight, achieving improved stability with acceptable weight increase
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
The design effectively suppresses swinging motions and lifter-hitting noise, ensuring stable operation and reduced mechanical complexity without significant structural changes.
Implementation Method 1
an inertial mass that is provided below the lifter body. A part below the rotation stopper does not have the inertial mass and is open
Data Source
AI summary
A roller lifter includes: a lifter body that is cylindrical and that reciprocates in a lifter guide in an up-down direction; a pair of facing portions that protrude downward from the lifter body and face each other in a manner spaced apart from each other in a radial direction of the lifter body; a rotation stopper that is positioned between the pair of facing portions, and has a shape protruding downward from the lifter body and bent outward in the radial direction; a shaft member that extends in the radial direction and has both ends in the radial direction respectively supported on the pair of facing portions; a roller that is rotatably provided on the shaft member and is in contact with a cam; and an inertial mass that is provided below the lifter body. A part below the rotation stopper does not have the inertial mass and is open.