Torsional Vibration Damper Spring Support With Cleaning Holes
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Solution Overview
Problem
The manufacturing process of torsional-vibration reducing devices is inefficient due to difficulties in cleaning and removing cleaning solutions from the rotation members, leading to increased production time. Additionally, the weight of the rotation members is increased due to the arc-shaped spring retaining portions, which reduces their rotation strength against centrifugal forces.
Innovation Solution
The method involves forming input and output rotation members through punching press and bending processes, followed by heat treatment. Long holes are drilled in the spring retaining portions to facilitate the passage of cleaning solutions, allowing for efficient cleaning and removal. This design reduces the weight of the rotation members and enhances their rotation strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If arc-shaped spring retaining portions are used to support the coil spring, then the spring can be supported along its entire outer peripheral surface, but the weight of the rotation member increases
Solution Approach 1:
The arc-shaped spring retaining portion is segmented into a plurality of radially protruding spring retaining protrusions. These protrusions are distributed around the rotation member and each contacts a portion of the coil spring's outer peripheral surface, providing sufficient support while reducing material usage compared to a continuous arc-shaped structure.
Solution Approach 2:
Instead of providing continuous contact along the entire spring outer peripheral surface, the spring retaining protrusions provide localized contact points. Each protrusion is positioned to contact a specific portion of the spring, creating local support zones that are sufficient for the spring's function while minimizing the overall weight of the rotation member.
2Reliability
If the spring retaining portion contacts the entire spring outer peripheral surface, then the spring is well-supported, but the rotation member becomes heavier and rotation strength decreases
Solution Approach 1:
The continuous contact surface is segmented into discrete protrusions, reducing the mass of the rotation member while maintaining spring support functionality. The segmented structure also reduces the moment of inertia, improving rotation strength against centrifugal forces.
Solution Approach 2:
Instead of providing excessive contact along the entire spring surface, the invention uses partial contact through strategically positioned protrusions. This partial action is sufficient to support the spring while minimizing weight and maximizing rotation strength.
3Manufacturing precision
If the damper product is cleaned after assembly, then cleaning can be performed on the complete product, but the cleaning solution is collected on the rotation member and requires a large amount of time to remove
Solution Approach 1:
Holes are extracted from the rotation member at the spring retaining portion to create drainage pathways. These holes allow the cleaning solution to flow through the rotation member and be quickly removed, preventing accumulation and significantly reducing the time required for the cleaning and drying processes.
Solution Approach 2:
The holes act as intermediary channels that facilitate the movement of cleaning solution through the rotation member. By providing these intermediate pathways, the cleaning solution can efficiently traverse the structure and be removed without accumulating on surfaces.
Data Source
AI summary
A torsional-vibration reducing device includes: an input rotation member, an output rotation member, a coil spring which mitigates torque fluctuation generated at an input side and transmits power to an output side, a spring retaining portion provided on at least one of the input rotation member and the output rotation member and configured to support the coil spring, and a hole formed at a position corresponding to the spring retaining portion in an outer diameter direction with respect to a rotation center line.