Variable Flow Valve Pin Stabilization for Turbocharger Chatter
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Solution Overview
Problem
The existing variable flow valve mechanisms in turbochargers experience chattering sounds due to vibrations caused by pulsation pressure, leading to reduced quietness, as the connecting pin is not effectively stabilized within the pin hole, allowing free movement and vibration of the actuating rod and link member.
Innovation Solution
A biasing member, such as an annular wave spring, torsion springs, or leaf springs, is provided inside the pin hole to bias the connecting pin to the center, stabilizing its position and reducing vibrations, thereby minimizing chattering sounds and enhancing quietness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is provided between the inner circumferential surface of the pin hole and the outer circumferential surface of the connecting pin to ensure stability of interlocking operation, then the connecting pin can freely move with respect to the pin hole when the opening portion is opened, but vibrations occur due to pulsation, causing chattering sounds and reduced quietness
Solution Approach 1:
A biasing member (spring) is introduced as an intermediary element between the connecting pin and the pin hole. This spring applies a biasing force to maintain contact between the pin and the inner circumferential surface of the pin hole, eliminating the gap-induced free movement while still allowing necessary interlocking operation stability. The biasing member mediates between the need for operational stability and the need to prevent chattering sounds.
Solution Approach 2:
The biasing member applies a preliminary counteracting force to prevent the harmful vibration and chattering sound before they occur. By continuously applying the biasing force to keep the connecting pin in contact with the pin hole surface, the system preemptively counteracts the pulsation-induced separation that would otherwise lead to chattering sounds.
2Adaptability or versatility
If the connecting pin is allowed to freely move with respect to the pin hole for operational stability, then the mechanism can accommodate movement, but wear occurs on the pin surfaces due to repeated contact and vibration
Solution Approach 1:
The biasing member serves as an intermediary that maintains controlled contact between the connecting pin and the pin hole. It provides just enough force to prevent excessive wear by eliminating impact and vibration, while still allowing the necessary movement accommodation for operational adaptability.
Solution Approach 2:
The biasing member changes the contact parameter between the pin and pin hole from intermittent impact contact to continuous controlled contact. This parameter change reduces the severity of interactions, minimizing wear while preserving the ability to accommodate movement.
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 stabilization of the connecting pin reduces vibrations of the actuating rod and link member, resulting in reduced chattering sounds and improved quietness of the variable flow valve mechanism, while also preventing wear on the pin surfaces.
Implementation Method 1
a biasing member configured to bias the connecting pin to a center side of the pin hole is provided inside the pin hole
Implementation Method 2
an annular wave spring, torsion springs, or leaf springs, is provided inside the pin hole to bias the connecting pin to the center, stabilizing its position and reducing vibrations
Data Source
AI summary
A connecting pin is integrally provided at a distal end portion of an actuating rod of an actuator, a pin hole for allowing insertion of the connecting pin is penetrated and formed at a distal end portion of the link member, an annular wave spring for biasing the connecting pin to a center side of the pin hole is provided inside the pin hole of the link member, the wave spring is fitted into a circumferential groove of the connecting pin and alternately has a plurality of convex portions and a plurality of concave portions along its circumferential direction, each of the convex portions of the wave spring is brought into pressure contact with an inner circumferential surface of the pin hole, and each of the concave portions of the wave spring is brought into pressure contact with a bottom surface of the circumferential groove of the connecting pin.