Hypocycloid Reduction Assembly for Stable Tool Speed Limiting
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Solution Overview
Problem
High-speed rotational tools pose risks in various industries, particularly in the medical field, where controlling speed is crucial to minimize procedural variables and ensure safety.
Innovation Solution
A hypocycloid reduction assembly comprising an upper housing, drive shaft, disk assembly, and lower housing, with a disk having lobes that engage with a receptacle, allowing for the reduction of rotational velocity by interacting with an eccentric segment, effectively slowing down the tool's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed rotational tools are used, then productivity is improved, but safety and operational control deteriorate due to excessive speed
Solution Approach 1:
The patent applies preliminary anti-action by incorporating a speed reduction mechanism before the tool operates. The hypocycloid reduction assembly pre-limits the maximum rotational speed to a safe level, preventing excessive speed from occurring in the first place. This ensures that while the tool can operate at high speeds for productivity, the speed is always constrained within safe boundaries for reliability.
2Reliability
If speed reduction mechanisms are added, then safety and operational control are improved, but device complexity increases
Solution Approach 1:
The patent merges the speed reduction function with the tool housing structure. The hypocycloid reduction assembly is integrated into the existing tool architecture, combining multiple functions (speed reduction, structural support, and housing) into a unified design. This reduces overall device complexity compared to adding a separate, standalone speed reduction mechanism.
Solution Approach 2:
The hypocycloid reduction assembly is nested within the tool housing structure. The mechanism is contained within the existing operational theater environment, with components nested within each other (drive shaft within housing, reduction gears within drive shaft assembly). This nesting approach minimizes the overall footprint and reduces the number of external components needed.
3Reliability
If speed reduction is implemented, then operational risks are reduced, but the device volume increases
Solution Approach 1:
The patent employs curved hypocycloid gear profiles instead of traditional straight-cut gears. The hypocycloid curvature allows for more compact gear tooth engagement, reducing the overall volume required for the reduction mechanism. The curved paths enable smoother, more efficient power transmission in a smaller space compared to conventional gear designs.
Solution Approach 2:
The hypocycloid reduction mechanism utilizes three-dimensional spatial optimization. The eccentric drive shaft and lobed disk create a complex 3D motion path that achieves high reduction ratios in a compact volume. By utilizing spatial arrangement in multiple dimensions rather than simple linear stacking, the mechanism achieves effective speed reduction without proportionally increasing device volume.
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 reduces the rotational speed of tools, enhancing safety and reducing operational risks by providing a controlled and stable speed, which is particularly beneficial in medical procedures.
Implementation Method 1
A hypocycloid reduction assembly comprises an upper housing, drive shaft, disk assembly, and lower housing. The disk has lobes that engage with a receptacle, allowing for the reduction of rotational velocity by interacting with an eccentric segment.
Implementation Method 2
The drive shaft has a top segment, a middle segment, and a lower segment. The top segment and the lower segment each have a centerline that lies on the same first axis. The middle segment has a centerline that lies on a second axis that is parallel to and displaced from the first axis.
Data Source
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AI summary
A reduction assembly, attachable to a torque limiting device, comprising a drive shaft having an input segment, an eccentric segment, and an output segment, wherein the input segment and the output segment each have a centerline running along a same first axis, and wherein the eccentric segment has a center line running along a second axis, the second axis being parallel to the first axis and positioned a first distance away from the first axis. The assembly further comprising a disk assembly having a disk with a body, a plurality of lobes positioned concentrically on the body, and an opening extending through the body, the opening configured to slidably engage the eccentric segment of the drive shaft. The assembly further comprising a disk receptacle configured to engage with the disk, the receptacle having a floor and a wall with a plurality of protrusions extending from the wall, wherein the number of the plurality of protrusions is equal to one more than the number of the plurality of lobes on the disk.