Flywheel Torque Limiter Recess Layout for Compact Torque Capacity
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Solution Overview
Problem
Existing power transmission devices with torque limiters face challenges in achieving a required torque capacity without increasing the radial dimension, leading to potential interference between the torque limiter and the flywheel.
Innovation Solution
A power transmission device design that includes a flywheel with an annular portion and an accommodation portion, featuring a torque limiter unit with a first plate, a second plate, a friction disc, and a pressing member, where the annular portion has recesses to prevent interference and allow for increased diameter of the second plate, thereby maintaining a compact size and required torque capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque limiter is enlarged to reliably have a required torque capacity, then the torque capacity is improved, but the radial dimension of the device increases
Solution Approach 1:
The invention resolves the contradiction by transitioning from radial expansion to axial expansion. The second plate is extended in the axial direction (thickness increase) rather than the radial direction, allowing the torque limiter to achieve required torque capacity through increased plate thickness while maintaining compact radial dimensions. This dimensional shift enables the torque limiter to fit within the flywheel's accommodation portion without radial interference.
2Reliability
If the second plate is increased in diameter to improve torque capacity, then the torque capacity is improved, but interference with the flywheel occurs
Solution Approach 1:
The invention avoids radial interference by redirecting the expansion of the second plate into the axial dimension. Instead of increasing the plate's diameter which would cause interference with the flywheel's annular portion, the plate's thickness is increased axially. This allows the torque limiter to achieve sufficient torque capacity through the pressing force generated by the thicker plate while maintaining compatibility with the flywheel's radial dimensions.
Solution Approach 2:
The invention applies local quality by concentrating the torque capacity enhancement in a specific region - the axial thickness of the second plate - rather than uniformly expanding the entire torque limiter structure. The recesses in the flywheel's annular portion are strategically positioned to accommodate the extended second plate, allowing localized adaptation that enables increased plate thickness without global radial expansion.
3Object-affected harmful factors
If recesses are provided in the annular portion to prevent interference, then interference is avoided, but the structural complexity increases
Solution Approach 1:
The invention applies segmentation by dividing the annular portion of the flywheel into distinct regions - areas with recesses and areas without recesses. The recesses are strategically positioned only where needed to accommodate the second engaging portions of the torque limiter, allowing the majority of the annular portion to maintain its original simple structure. This selective segmentation minimizes the increase in structural complexity while effectively preventing interference.
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 design effectively prevents excessive torque transmission and inhibits radial dimension increase, ensuring the torque limiter has a reliable torque capacity without interference between the flywheel and torque limiter, thus maintaining device compactness.
Implementation Method 1
When the torque inputted to the friction disc from the flywheel is excessive in magnitude, the friction disc slips while being interposed and held between the first plate and the second plate. Accordingly, the excessive torque is prevented from being transmitted to the output side.
Data Source
AI summary
A power transmission device includes a flywheel and a torque limiter unit fixed to the flywheel. The flywheel includes an annular portion and an accommodation portion provided on an inner peripheral side of the annular portion to accommodate the torque limiter unit. The torque limiter unit includes a first plate, a second plate, a friction disc disposed between the first and second plates, and a pressing member. A torque is inputted to the first plate. The first plate includes first engaging portions. The second plate is axially opposed to and non-rotatable relative to the first plate. The second plate includes second engaging portions engaged with the first engaging portions. The pressing member presses the second plate onto the friction disc. The annular portion of the flywheel is provided with recesses on the inner peripheral surface thereof. The recesses are recessed radially outward in opposed positions to the second engaging portions.