Planetary Damper Stopper Layout for Spring Load Protection
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Solution Overview
Problem
Conventional torsional vibration dampers lack a mechanism to restrict relative rotation between cover plates and a sun gear, leading to durability issues when high torque is transmitted, as excessive inertia torque from the rotary inertia mass damper can act on the spring, causing potential damage.
Innovation Solution
A damper device with a stopper mechanism that restricts relative rotation between the first and third rotational elements, incorporating a planetary gear system with a sun gear, pinion gears, and a ring gear, and a stopper configured to contact the first rotational element, preventing excessive load from the rotary inertia mass damper from acting on the springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relative rotation between cover plates and sun gear is restricted to protect springs from excessive load, then the durability of the damper device is improved, but the device complexity increases due to the stopper mechanism
Solution Approach 1:
The stopper acts as an intermediary component between the cover plate and sun gear, physically preventing excessive relative rotation. This mediator component directly addresses the reliability issue by limiting the rotation that would otherwise cause spring damage, while adding only minimal structural complexity to the overall system.
2Reliability
If a stopper mechanism is added to restrict relative rotation, then the springs are protected from excessive load, but the manufacturing complexity increases
Solution Approach 1:
The stopper mechanism is designed as a segmented, modular component that can be independently manufactured and assembled. This segmentation allows for simpler manufacturing processes compared to integrating the restriction function into existing components, as the stopper can be produced as a separate standard part and then installed in the assembly.
3Force
If the stopper contact portion is positioned in the outer circumferential portion of the sun gear, then the moment on pinion gear support members is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The stopper contact portion is positioned in the outer circumferential portion of the sun gear, utilizing the radial dimension to optimize the moment arm. By placing the contact point at the outer circumference rather than near the center, the design reduces the moment transmitted to the pinion gear support members. This dimensional positioning strategy effectively manages force distribution while maintaining reasonable manufacturing tolerances.
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 effectively protects the springs by restricting relative rotation and reducing moment on the pinion gear support members, thereby enhancing the durability of the damper device by preventing excessive load and deformation.
Implementation Method 1
a first elastic body arranged to transmit a torque between the first element and the second element, a second elastic body arranged to transmit a torque between the second element and the third element
Implementation Method 2
a rotary inertia mass damper with a mass body rotating in accordance with relative rotation between the first rotational element and the third rotational element
Data Source
AI summary
A drive member of a damper device includes a first input plate member and a second input plate member that rotatably support a plurality of pinion gears of a planetary gear of a rotary inertia mass damper. A driven member includes an outer teeth gear portion that meshes with the pinion gear in an outer circumferential portion thereof and is disposed between the first and the second input plate members in an axial direction so as to work as a sun gear of the planetary gear. A stopper is configured to restrict the relative rotation between the drive member and the driven member and includes a contact portion arranged in the outer circumferential portion of the driven member so as to contact with the first input plate member.