Centrifugal Pendulum Damper Oil Discharge for Stable Rolling Mass Oscillation
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Solution Overview
Problem
Conventional centrifugal pendulum dampers face reduced vibration damping performance due to excessive oil lubrication, which hinders the oscillating motion of rolling masses and leads to abrasion issues, requiring a simple structure to effectively lubricate and discharge oil without limiting vibration damping.
Innovation Solution
A centrifugal pendulum damper design featuring a rotary member, inertia body, rolling mass, retainer, and oil passage that allows centrifugal discharge of oil from the recess, utilizing through holes, grooves, and slant raceway surfaces to prevent excessive oil accumulation and ensure smooth oscillation of rolling masses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oil is supplied to the rolling members to prevent abrasion, then the rolling members are lubricated and wear is reduced, but the viscosity of the oil hinders the oscillating motion of the rolling members and reduces vibration damping performance
Solution Approach 1:
The recess is divided into a lubrication area and a discharge area, with the raceway surface segmented into regions with different oil supply characteristics. This allows different zones to serve different functions: one for lubrication and another for oil discharge, resolving the contradiction between needing oil for abrasion prevention and needing to limit oil to maintain oscillation performance
Solution Approach 2:
Different areas of the recess and raceway surface are given different properties: the lubrication area has features that retain oil (such as lubrication grooves), while the discharge area has features that facilitate oil flow (such as discharge grooves or openings). This local differentiation allows the system to have both lubrication and oscillation freedom where needed
2Reliability
If the amount of oil is increased to ensure adequate lubrication, then abrasion protection is improved, but the rolling members become hindered by excessive oil and their oscillating motion is restricted
Solution Approach 1:
The oil amount in the recess is made dynamic rather than static. The discharge area allows excess oil to be automatically discharged based on the oscillation state and centrifugal forces, so the oil quantity adapts to operating conditions: sufficient oil is retained for lubrication while excess oil is discharged to prevent hindering the oscillation motion
Solution Approach 2:
The system uses its own oscillation motion and centrifugal forces to automatically regulate the oil amount. During oscillation, centrifugal forces naturally discharge excess oil from the discharge area, eliminating the need for external control mechanisms and ensuring the rolling members always have appropriate oil quantity for their motion
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 prevents abrasion and maintains vibration damping performance by allowing oil to be discharged centrifugally, ensuring the rolling masses can function as pendulum masses, thereby enhancing the damper's ability to damp torsional vibrations without limiting performance.
Implementation Method 1
a raceway surface formed on an inner circumference of the recess to which an outer circumferential surface of the rolling mass is contacted
Implementation Method 2
a rolling member connecting the rotary member and the inertia body
Implementation Method 3
an oil that lubricates the rolling mass and members contacted to the rolling mass
Implementation Method 4
an oil passage that guides the oil remaining in the recess while being subjected to a centrifugal force to flow out of the raceway surface
Implementation Method 5
an inertia body that is arranged coaxially with the rotary member while being allowed to oscillate relatively to the rotary member
Implementation Method 6
Torque of the rotary member is transmitted to the inertia body through the rolling mass to damp torsional vibrations of the rotary member
Data Source
AI summary
A centrifugal pendulum damper in which a rolling mass can be lubricated by a simple structure without limiting vibration damping performance. The pendulum damper comprises: a rotary member; an inertia body arranged concentrically with the rotary member; a rolling mass held in a retainer on an outer circumference of the rotary member; a recess formed on an inner circumference of the inertia body; and a raceway surface formed on an inner circumference of the recess to which the rolling mass is contacted. In the centrifugal pendulum damper, oil remaining in the recess is discharged out of the recess through an oil passage.