Clutch-Equipped Motor Layout for Compact Electric Chain Blocks
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Solution Overview
Problem
Existing electric chain block configurations face challenges in reducing the axial length and radial size due to the inclusion of connection members and large-diameter hollow shafts, leading to interference and increased dimensions.
Innovation Solution
A clutch-equipped motor design featuring a stator, rotor, and motor shaft with a friction clutch mechanism, where the clutch plate and clutch receiver are integrated within the rotor's cylindrical portion, and a biasing mechanism adjusts the frictional force, allowing for a compact design by shortening the motor shaft's axial length and preventing radial expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a connection member and drive transmission shaft are arranged outside the casing, then the drive force can be transmitted to the load sheave, but the axial length of the electric chain block increases
Solution Approach 1:
The drive transmission shaft is nested inside the hollow shaft, and the connection member is integrated within the rotor structure. This nesting arrangement allows the drive force transmission components to be contained within the existing casing volume, eliminating the need for external arrangement and thus reducing the axial length of the electric chain block while maintaining the drive force transmission function
2Adaptability or versatility
If a large-diameter hollow shaft is used, then the rotor shaft can be combined with the friction clutch, but the radial size of the casing increases
Solution Approach 1:
The connection member is merged with the rotor structure to form an integrated assembly, and the drive transmission shaft is combined with the friction clutch components. This merging eliminates the need for a separate large-diameter hollow shaft, as the clutch receiver and connection member work together within a compact configuration, thereby reducing the radial size of the casing while maintaining the adaptability for rotor shaft combination
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 achieves a reduced axial length and prevents radial enlargement, enhancing stability and longevity of the electric chain block while maintaining efficient operation.
Implementation Method 1
a stator capable of generating a rotating magnetic field by passing a current through a coil; a rotor arranged in an inner cylindrical portion of the stator and rotated by the rotating magnetic field
Implementation Method 2
a friction clutch mechanism arranged on an end portion side of the rotor in an axial direction of the motor shaft, wherein the friction clutch mechanism has: a clutch plate fixed to an end surface side of the rotor in the axial direction of the motor shaft and thereby rotating integrally with the rotor; a connection member having a cylindrical part, the motor shaft and the drive transmission shaft being inserted into an inner cylindrical portion of the cylindrical part in a state of rotating integrally with the cylindrical part; a clutch receiver arranged on an outer peripheral side of the connection member and rotating integrally with the connection member; and a biasing means for biasing the clutch plate and the clutch receiver in a direction of bringing the clutch plate and the clutch receiver into contact with each other
Data Source
AI summary
A clutch-equipped motor comprising: a stator capable of generating a rotating magnetic field; a rotor rotated by the rotating magnetic field; a motor shaft capable of rotating with respect to the rotor via a bearing; and a friction clutch mechanism arranged on an end portion side of the rotor in an axial direction of the motor shaft, wherein the friction clutch mechanism has: a clutch plate rotating integrally with the rotor; a connection member having a cylindrical part, the motor shaft and the drive transmission shaft being inserted into an inner cylindrical portion of the cylindrical part in a state of rotating integrally with the cylindrical part; a clutch receiver rotating integrally with the connection member; and a biasing means for biasing the clutch plate and the clutch receiver in a direction of bringing the clutch plate and the clutch receiver into contact with each other.