Planetary Torsional Vibration Damper With Axial Motion Suppression
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Solution Overview
Problem
Existing torsional vibration dampers face challenges in reducing torsional vibrations effectively due to size constraints and axial displacement issues, leading to increased noise and reduced vibration-reducing performance.
Innovation Solution
A torsional vibration damper design featuring a planetary rotary unit with a shaft supporting member that allows relative rotation between rotary elements, incorporating a holding section to suppress axial movement and maintain the rotation center axes of the rotary elements on the same axis, thereby reducing the size of the damper and enhancing vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide bearing is provided between fellow springs adjacent in the circumferential direction on an inner radial side of the sun gear, then the sun gear can be supported, but the space on the inner radial side of the sun gear narrows, restricting sizes of the guide bearing or spring
Solution Approach 1:
The invention moves the guide bearing from the inner radial side space to the circumferential direction space between planetary rotary elements. This dimensional relocation resolves the spatial conflict by utilizing previously underutilized circumferential gaps, allowing the guide bearing to support the rotary element without encroaching on the inner radial side space needed for springs.
2Stability of the object's composition
If a snap ring is used to suppress displacement of the sun gear in the axial direction, then axial displacement can be suppressed, but rotation of the sun gear is hindered by sliding resistance due to side surface contact
Solution Approach 1:
The invention extracts the axial displacement suppression function from the rotating sun gear by applying it to the non-rotating guide bearing instead. The guide bearing's outer ring is pressed against the rotary element's side surface, creating a stationary contact point that suppresses axial displacement without interfering with the rotational motion of the sun gear itself.
Solution Approach 2:
The guide bearing acts as an intermediary element that indirectly suppresses axial displacement of the rotary element without requiring direct contact between the sun gear and axial constraint components. This mediation eliminates the harmful sliding resistance while maintaining axial position stability through the guide bearing's structural support.
3Ease of operation
If the rotary element rotates smoothly without axial suppression, then vibration reduction performance improves, but axial displacement increases causing clearance increase and tooth striking noise
Solution Approach 1:
The guide bearing serves as a mediator that decouples the axial constraint function from the rotational motion function. By positioning the guide bearing to press against the rotary element's side surface, it suppresses axial displacement that would otherwise cause clearance increases and tooth striking noise, while the rotary element continues to rotate smoothly without direct contact between axial constraint components and rotating surfaces.
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 solution enables smooth rotation of the inertia mass body, effectively reducing torque pulsation and suppressing axial movement, resulting in improved vibration-reducing performance and reduced noise.
Implementation Method 1
the elastic body is elastically deformed whereby a relative rotation of the two rotary elements occurs, and the planetary rotary elements make a reciprocating movement
Implementation Method 2
An inertia torque of the carrier acts as a resistance to the fluctuation of the torque inputted from the prime mover
Data Source
Figure 1
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Figure 3
AI summary
A torsional vibration damper (1) includes a planetary rotary unit (3) and an elastic body (8) that couples two rotary elements (4, 5, 7) of three rotary elements (4, 5, 7) so that the two rotary elements (4, 5, 7) can rotate relatively to each other. The torsional vibration damper (1) includes a shaft supporting member (15) by which a rotation center axis of at least any one rotary element (4, 5, 7) of the two rotary elements (4, 5, 7) and a rotation center axis of the rotary element (4, 5, 7) other than the planetary rotary unit (3) and the two rotary elements (4, 5, 7) are held on the same axis. The shaft supporting member (15) has a holding section (20) that is disposed in a position between fellow planetary rotary elements (6) and not making contact with the planetary rotary elements (6) and that fits with and thereby suppresses movement of the rotary element (4, 5, 7) other than the planetary rotary unit (3) and the two rotary elements (4, 5, 7) in the axial direction.