Dynamic Vibration Absorber Torque Limiting Mechanism
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Solution Overview
Problem
Dynamic vibration absorbers in rotary members, such as damper devices, can be damaged or broken when excessive torque is inputted due to sudden movements or braking, as the inertia force transmitted to them can cause damage.
Innovation Solution
A dynamic vibration absorber is configured with a base member, a mass body, and a torque limiting part, where the torque limiting part restricts torque transmission from the rotary member to the base member when excessive torque is applied, preventing damage by allowing relative rotation when torque exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dynamic vibration absorber is attached to a rotary member to inhibit fluctuations in rotational velocity, then the rotational velocity stability is improved, but the reliability deteriorates when excessive torque is inputted due to sudden movement or braking
Solution Approach 1:
A torque limiting part is introduced as an intermediary component between the rotary member and the dynamic vibration absorber. This torque limiting part selectively transmits torque when it is within a safe range, but limits or blocks excessive torque transmission. This resolves the contradiction by allowing the dynamic vibration absorber to function normally for velocity stabilization while protecting it from damage during excessive torque events through the mediating torque limiting part.
2Reliability
If the torque limiting part limits torque transmission to protect the rotary member, then the reliability is improved, but the rotational velocity control capability deteriorates
Solution Approach 1:
The torque limiting part is designed with dynamic characteristics that allow it to adaptively respond to different torque conditions. Under normal operating conditions with torque within the safe range, the torque limiting part maintains full torque transmission to preserve rotational velocity control capability. When excessive torque is detected, it automatically activates to limit torque transmission, thus protecting the system. This dynamic behavior resolves the contradiction by ensuring protection only when necessary while maintaining full control capability during normal operation.
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 dynamic vibration absorber effectively prevents damage to the rotary member by limiting torque transmission, ensuring the system remains operational even under excessive torque conditions.
Implementation Method 1
The dynamic vibration absorber includes a housing and a viscous fluid. The housing is attached to the base member and accommodates the mass body. The viscous fluid is filled in the housing.
Implementation Method 2
The dynamic vibration absorber can further include a centrifugal element and a cam mechanism. The centrifugal element is disposed to receive a centrifugal force that is generated by rotation of the base member.
Implementation Method 3
The cam mechanism converts the centrifugal force acting on the centrifugal element into a force directed in a circumferential direction.
Implementation Method 4
The torque limiting part can include an urging member that urges the base member toward the rotary member.
Data Source
AI summary
A dynamic vibration absorber is configured to be attached to a rotary member. The dynamic vibration absorber includes a base member, a mass body, and a torque limiting part. The base member is rotatably disposed. The mass body is attached to the base member so as to be rotatable relatively thereto. The torque limiting part limits transmission of a torque to be inputted into the base member from the rotary member.