Torque Limiter Split Coupling Elastic Separation
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Solution Overview
Problem
Conventional power transmission devices with torque limiters using threaded fastening fail to completely shut off power transmission when the torque limiter ruptures, as the ruptured parts can re-fasten, causing the power transmission to continue, leading to potential damage.
Innovation Solution
Incorporating an elastic member between the power transmission shut-off member and the rotary part, which separates the split portions of the shut-off member, preventing re-fastening and ensuring complete power shut-off by using a configuration where the first portion can move freely from the second portion, and providing a stopper means to prevent dropping, thus maintaining a gap and preventing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a power transmission shut-off member is threadedly coupled to the rotating shaft, then the device structure is simple and cost-effective, but the shut-off member may re-fasten after rupture causing power transmission to fail
Solution Approach 1:
The power transmission shut-off member is divided into two separate portions: a first portion threadedly coupled to the rotating shaft, and a second portion coupled to the rotary part. This segmentation ensures that when the shut-off member ruptures, the two portions separate and cannot re-fasten, maintaining reliable power shut-off while preserving the simplicity of threaded coupling.
2Reliability
If the power transmission shut-off member is allowed to move freely, then re-fastening is prevented, but the shut-off member may drop causing interference
Solution Approach 1:
A stopper means is introduced as an intermediary component between the power transmission shut-off member and the surrounding structure. This stopper prevents the shut-off member from dropping or moving excessively while still allowing it to move freely enough to prevent re-fastening of the threaded coupling after rupture.
3Reliability
If an elastic member is added between the shut-off member and rotary part, then separation of split portions is ensured, but the device complexity increases
Solution Approach 1:
The elastic member changes the mechanical parameters of the connection between the power transmission shut-off member and the rotary part. By introducing elasticity, the system automatically separates the split portions when torque exceeds the rupture threshold, while the elastic property itself provides the separating force, minimizing additional 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
The elastic member ensures that the power transmission is completely shut off when the torque limiter operates, preventing re-fastening and maintaining the gap to avoid power transmission issues even if the shut-off member ruptures, thus ensuring reliable operation.
Implementation Method 1
an elastic member (8) installed between the power transmission shut-off member (3) and the rotary part (1, 2)
Data Source
AI summary
A power transmission device (10) comprises a rotatable rotary part (1, 2) to which a rotational drive force is transmitted from a drive source and a power transmission shut-off member (3) that shuts off transmission of an excessive torque between the rotary part and a rotating shaft (4) of a device to be driven. The power transmission shut-off member is threadedly coupled to the rotating shaft and can rotate with the rotating shaft. The rotary part is installed so as to be sandwiched between the power transmission shut-off member and the rotating shaft. A disc spring (8), installed between the power transmission shut-off member and the rotary part, is further provided. A caulked part (204a) for preventing a part of the power transmission shut-off member from dropping is provided on the front end side of the rotating shaft.