Magnetic Clutch Chain Block for Quiet Mode Switching
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Solution Overview
Problem
Manual chain blocks used for cargo handling experience mechanical noise due to frequent switching between low-speed and high-speed rotation modes, as the clutch projection fails to reliably switch between these modes, especially under varying load conditions.
Innovation Solution
A chain block design featuring a gear mechanism with magnetic clutch components, including a first and second rotary body with tooth parts, a magnet, and a clutch pin system with specific pocket configurations and inclined surfaces, allowing for smooth mode switching by controlling magnetic attraction and torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a magnetic clutch device is used to enable switching between low-speed and high-speed rotation modes, then adaptability to different load conditions is improved, but mechanical noise increases due to frequent switching between modes
Solution Approach 1:
The patent introduces a clutch holding magnetic body as an intermediary element between the clutch projection and the engaging recess part. This magnetic body maintains continuous magnetic attraction to hold the clutch projection in the engaged position, preventing frequent disengagement and reengagement that causes mechanical noise, while still allowing mode switching when load conditions change
2Reliability
If the clutch projection is magnetically held by the clutch holding magnetic body, then reliability of mode switching is improved, but device complexity increases due to additional magnetic components
Solution Approach 1:
The patent merges the clutch holding magnetic body with the existing magnetic clutch mechanism components. The magnetic holding function is integrated into the same magnetic field system that enables mode switching, rather than adding a completely separate holding mechanism. This reduces overall device complexity while maintaining reliable mode switching
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 easy and reliable switching from low-speed to high-speed rotation modes, reducing mechanical noise and ensuring consistent operation under varying loads by utilizing magnetic attraction and torque control.
Implementation Method 1
a magnetic clutch device... a magnetic coupling is established... the clutch projection is magnetically held by the clutch holding magnetic body
Implementation Method 2
a magnetic coupling is established in which a tooth-shaped part of a magnetic pole rotary body and a tooth-shaped part of a yoke rotary body closely face each other, and they synchronously rotate to transmit rotation torque
Data Source
AI summary
A chain block comprises: a first rotary body in which a first tooth part f is arranged; a second rotary body comprising a second tooth part which opposes to a first tooth part with magnetic attraction force and releasing the magnetic coupling state by sliding toward thrust direction; a clutch pin integrally provided with the second rotary body; a clutch receiving member comprising a plurality of recessed pockets to which the clutch pin enters according to a slide of the second rotary body; wherein the plurality of pockets comprise; a hoisting-side pocket in which a magnetic member is arranged; a lowering-side pocket in which a magnetic member is arranged; and an intermediate pocket which exists between the hoisting-side pocket and the lowering-side pocket and which the clutch pin enters in a state of not being magnetically attracted.