Load Sensitive Magnetic Clutch Preventing Unintended Return
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Solution Overview
Problem
Magnetic clutch devices face issues with quick and reliable switching between high-load and low-load torque transmission routes due to variability in load torque, often resulting in unintended clutch returns in applications like manual chain blocks, where mechanical brakes reduce load torque.
Innovation Solution
A load-sensitive magnetic clutch device featuring a magnetic pole rotating body with claw clutch projections, a yoke rotating body with tooth-shaped portions, and high-torque input means with forward and reverse rotation torque transmission surfaces, utilizing a claw clutch disengagement mechanism to manage magnetic forces and prevent clutch returns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic clutch device uses magnetic attracting force to transmit torque between rotating bodies, then automatic sliding and route switching can be achieved, but clutch return occurs due to load torque reduction by mechanical brake
Solution Approach 1:
The patent applies preliminary anti-action by introducing a clutch retaining magnetic body that exerts a retaining magnetic force on the clutch projection before the magnetic clutch can return unintentionally. This retaining force counteracts the effect of load torque reduction by the mechanical brake, preventing the clutch projection from disengaging from the high-torque input means when it should remain engaged. The retaining magnetic force acts as a preliminary protective measure against the harmful clutch return phenomenon.
2Speed
If the clutch projection is attracted by magnetic force during high-load operation, then quick switching to high-torque route is achieved, but unintended clutch return occurs when load torque varies
Solution Approach 1:
The patent applies local quality by differentiating the magnetic force characteristics in different operational regions. The clutch retaining magnetic body provides a localized retaining magnetic force specifically at the clutch engagement interface, while the main magnetic poles provide the primary magnetic attracting force for torque transmission. This localized differentiation allows the system to maintain both quick switching (through the primary magnetic force) and route stability (through the localized retaining force that prevents unintended disengagement).
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
Enables rapid and reliable switching between high-load and low-load torque transmission routes, preventing unintended clutch returns and reducing device size and manufacturing costs, while ensuring smooth operation during forward and reverse rotations.
Implementation Method 1
the clutch engaging portion includes a clutch retaining magnetic body configured to attract the clutch projection by a magnetic force
Implementation Method 2
configured to transmit a torque caused by a magnetic attracting force
Data Source
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AI summary
There is provided a load sensitive magnetic clutch device including: a magnetic pole rotating body 14 having magnetic poles 14a arranged on the circumference thereof and provided with a clutch projection 16 of a claw clutch at an end thereof; a yoke rotating body 12 configured to rotate about an axial center of rotation 18b identical to that of the magnetic pole rotating body 14, including a tooth-shaped portion arranged so that tooth tips face the magnetic poles 14a and provided with the magnetic pole rotating body 14 and a tooth-shaped magnetic body 12a configured to transmit a torque caused by a magnetic attracting force; and high-torque input means 2 configured to rotate about the identical axial center of rotation 18b and having a clutch engaging portion 3 engaging the clutch projection 16, wherein the clutch projection 16 is formed of a magnetic body, the clutch engaging portion 3 includes a clutch retaining magnetic body 4 configured to attract the clutch projection 16 by a magnetic force, and the clutch projection 16 is attracted by the clutch retaining magnetic body 4 by an application of a load torque exceeding a torque which is transferrable between the magnetic pole rotating body 14 and the yoke rotating body 12. Therefore, a function to prevent an occurrence of a clutch return in which the load torque applied to a clutch portion during a winching operation of a load in a load sensitive magnetic clutch in the related art is reduced by an action of a mechanical brake and a torque transmitting route is switched to a low-load transmitting route is achieved.