Engine Balancer Mechanism Vibration Control
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Solution Overview
Problem
Conventional engines with balancer mechanisms fail to effectively inhibit vibrations caused by the couple of forces generated by the primary inertial force of the crank mechanism and the inertial force of the balancer mechanism at optional positions, leading to unwanted vibrations in the engine and vehicle body.
Innovation Solution
The engine's balancer mechanism adjusts the acceleration caused by the translational force and the couple of forces to be in opposite directions with the same magnitude, positioning the instantaneous center of rotation at a target location, allowing for the control of the elliptical shape of the primary inertial force to generate a translational force component, thereby inhibiting vibrations at the desired position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a balancer shaft is arranged in a position spaced a predetermined distance from a crankshaft to generate an inertial force reversed in direction to and having the same magnitude as that of a primary inertial force of a crank mechanism, then vibrations caused by the primary inertial force of the crank mechanism are inhibited, but a couple of forces is generated causing vibrations turning with the center of gravity of the engine as the instantaneous center of rotation
Solution Approach 1:
The patent introduces a link mechanism as an intermediary element to connect the engine to the vehicle body. This link acts as a mediator that isolates the engine from the vehicle body, preventing the transmission of vibrations caused by the couple of forces while allowing the balancer mechanism to continue functioning. The link serves as a buffer that decouples the vibration source from the structure it would otherwise transmit to.
2Object-affected harmful factors
If an engine is held through a link to prevent transmission of vibrations to the vehicle body, then vibrations caused by the couple of forces are prevented from being transmitted to the vehicle body, but vibrations themselves caused by the couple of forces generated in a position where the engine is supported are not controlled and inhibited
Solution Approach 1:
The link serves as a vibration isolating intermediary between the engine and the vehicle body. By positioning the link at a specific location and designing its mechanical properties, it acts as a mediator that blocks the transmission path of vibrations from the engine support position to the vehicle body, while the engine itself can still experience and contain its vibrations locally.
3Object-affected harmful factors
If the vectorial locus of a primary inertial force of a crank mechanism is made a circle and an inertial force of a balancer mechanism is reversed in direction to and has the same magnitude as that of the primary inertial force of the crank mechanism in all phases, then no translational force is generated, but this arrangement does not eliminate the couple of forces and their associated vibrations
Solution Approach 1:
The patent extracts and addresses the couple of forces problem separately from the translational force problem. While the balancer mechanism is designed to eliminate translational forces by creating a circular vectorial locus, the patent recognizes that the couple of forces is a separate issue that requires additional measures - specifically the link mechanism - to isolate and contain these vibrations.
4Object-affected harmful factors
If a link is used to prevent transmission of vibrations to the vehicle body, then the vehicle body is protected from vibrations, but additional parts and weight are required
Solution Approach 1:
The patent optimizes the parameters of the link mechanism, such as its length, cross-sectional area, material properties, and mounting positions, to achieve effective vibration isolation with minimal weight. By carefully adjusting these parameters, the link provides sufficient vibration isolation performance while keeping the added weight as low as possible.
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 solution effectively inhibits vibrations at the target position without the need for additional links, reducing parts and weight, and improves the stability and comfort of the vehicle by positioning the instantaneous center of rotation to counteract the couple of forces generated by the crank and balancer mechanisms.
Implementation Method 1
a uniaxial balancer mechanism for generation of an inertial force, which is reversed in direction to and has the same magnitude as that of a primary inertial force of a crank mechanism
Implementation Method 2
a couple of forces is generated by the primary inertial force of the crank mechanism and the inertial force of the balancer mechanism
Data Source
AI summary
An engine includes a crank mechanism and a balancer mechanism that inhibits vibrations caused by the crank mechanism. An instantaneous center of rotation of an engine is arranged in the neighborhood of a predetermined target position by adjusting an acceleration caused by a translational force generated by a primary inertial force of the crank mechanism and an inertial force of the balancer mechanism and an acceleration caused by a couple of forces generated by the primary inertial force of the crank mechanism and the inertial force of the balancer mechanism.