Propeller Shaft Dynamic Damper Radial Width Adjustment
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Solution Overview
Problem
In propeller shafts with dynamic and paper dampers, the weight member of the dynamic damper can contact the paper damper, altering the frequency characteristic and increasing manufacturing costs due to the need to elongate the dynamic damper's size.
Innovation Solution
The propeller shaft design includes a dynamic damper with a ring-like member on the outer side and a weight member on the inner side, elastically retained, and a paper damper with an outer paper portion extending beyond the dynamic damper to prevent contact between the inner paper portion and the weight member, maintaining the dynamic damper's frequency characteristic without increasing size or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length in the axial direction of the ring-like member is elongated to avoid contact between the weight member and paper damper, then contact is prevented, but the dynamic damper is enlarged in size and weight increases
Solution Approach 1:
The invention changes the approach from elongating in the axial direction to extending in the radial direction. The ring-like member is designed with a larger radial width to increase the axial distance between the weight member and paper damper, thereby preventing contact without increasing overall axial length or weight.
2Reliability
If the length in the axial direction of the ring-like member is elongated to avoid contact between the weight member and paper damper, then contact is prevented, but manufacturing cost is increased
Solution Approach 1:
The invention avoids elongating the axial length of the ring-like member, instead utilizing radial width adjustment. This dimensional change prevents contact between components while maintaining compact overall size, thereby avoiding increased manufacturing costs associated with larger dimensions.
3Reliability
If the dynamic damper is enlarged in size to prevent contact, then contact is avoided, but the propeller shaft becomes heavier and more complex
Solution Approach 1:
The invention resolves the contradiction by adjusting the radial width of the ring-like member rather than increasing axial length. This dimensional approach prevents contact between the weight member and paper damper while maintaining a compact structure, avoiding increased device complexity.
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 design prevents adverse contact between the paper damper and the dynamic damper's weight member, maintaining the dynamic damper's frequency characteristic while keeping the propeller shaft compact and lightweight, thus avoiding increased manufacturing costs and improving sound damping performance.
Implementation Method 1
a weight member (24) positioned in an inner side in a radial direction of the ring-like member (28) with respect to a center of the ring-like member (28)
Implementation Method 2
The outer paper portion is dimensioned longer so as to extend to the dynamic damper side farther than the inner paper portion. Thereby, the outer paper portion comes into contact with the ring-like member, whereby the inner paper portion is inhibited from coming into contact with the weight member.
Implementation Method 3
it is possible to improve a vibration characteristic of the propeller shaft 100 by installing the dynamic damper 102 to a cylinder inner portion of the propeller shaft 100 and attenuating a vibration by the dynamic damper 102
Data Source
AI summary
A propeller shaft with a dynamic damper and a tubular wound paper damper in an inner portion of the propeller shaft. The dynamic damper provided with a ring member at an outer side in a diametrical direction and a weight member elastically retained in an inner side in the diametrical direction of the ring member. The paper damper has an outer paper portion positioned in the outer side in the diametrical direction and an inner paper portion positioned in the inner side in the diametrical direction. The outer paper portion extending to the dynamic damper farther than said inner paper portion, contacting the ring member, thus inhibiting the inner paper portion from coming into contact with the weight member.