Segmented Hollow Shaft Structure for High-Frequency Vibration Reduction
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Solution Overview
Problem
Existing vibration reduction technologies are limited in application to gears with small or thick shapes, such as bevel gears, due to the requirement for a significant planar area, which restricts their use in gear train systems requiring high vibration stability, especially in devices like rotary gimbal devices for communication antennas and camera systems.
Innovation Solution
A vibration reduction shaft with a cylindrical outer shaft and inner hollow portion, featuring spaced first and second members connected by elastic connecting members and stoppers, which form a vibration reduction region to mitigate high-frequency vibrations through elastic deformation and damping, suitable for gear train systems with small gear areas and thick shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vibration reduction device using viscoelastic material and groove is applied to a gear shaft, then high-frequency vibration is reduced, but it cannot be applied to gears with small planar area such as bevel gears
Solution Approach 1:
The shaft is divided into multiple segments including a first member, a second member, and a vibration reduction region with connecting members. This segmentation allows the vibration reduction function to be concentrated in a specific region rather than requiring a large planar area across the entire gear surface, enabling application to small area gears like bevel gears.
Solution Approach 2:
The invention transitions from a two-dimensional groove-based vibration reduction approach to a three-dimensional structure using connecting members that extend axially between the first and second members. This dimensional change enables effective vibration reduction in the axial direction without requiring large radial planar area, making it suitable for small area gears.
2Volume of moving object
If a gear with small gear area or thick shape is used, then space is saved, but vibration reduction technology cannot be applied
Solution Approach 1:
The vibration reduction mechanism is nested within the shaft structure itself, with connecting members positioned inside the hollow portion of the shaft. This nested configuration provides vibration reduction functionality without increasing the external dimensions of the shaft, maintaining space efficiency while reducing vibration in small area gears.
Solution Approach 2:
The connecting members are designed to be elastic and deformable, allowing them to dynamically respond to vibration forces. This dynamic characteristic enables the vibration reduction mechanism to adapt to the thick shape and small area constraints of bevel gears while effectively mitigating vibration and noise.
3Object-affected harmful factors
If multiple connecting members are disposed spaced apart in the axial direction, then vibration reduction effectiveness is improved, but device complexity increases
Solution Approach 1:
The shaft is segmented into distinct functional regions with connecting members positioned at specific intervals in the axial direction. This segmentation creates multiple vibration reduction zones that work independently and cooperatively, improving overall vibration reduction effectiveness while maintaining a relatively simple modular structure that is easier to manufacture and assemble.
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
Effectively reduces high-frequency vibrations in gear train systems, enhancing stability and performance in applications like rotary gimbal devices and camera systems by providing a compact and effective vibration reduction mechanism.
Implementation Method 1
the other end of the connecting member may be coupled to the other of the first and second members through a damping material
Implementation Method 2
a general gear having a predetermined or more planar area needs to be provided to apply the technology to a gear train
Implementation Method 3
multiple connecting members 151, which connect the first member and the second member in an axial direction, are disposed to be spaced apart from one another within the vibration reduction region
Data Source
AI summary
A vibration reduction shaft includes a cylindrical outer shaft having an inner hollow portion, in which the outer shaft includes: a first member (110) and a second member (120) which are disposed to be spaced apart from each other in a longitudinal direction of the shaft; and a vibration reduction region (150) which is disposed between the first member and the second member, and multiple connecting members (151), which connect the first member and the second member in an axial direction, are disposed to be spaced apart from one another within the vibration reduction region.