Electromagnetic Engagement Apparatus Cam Thrust Control
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Solution Overview
Problem
Existing electromagnetic clutch systems require high electromagnetic force and large currents to engage and disengage, leading to inefficiencies in energy consumption and torque control.
Innovation Solution
An electromagnetic engagement apparatus featuring a cam mechanism with differential torque, return springs, and a yoke with an electromagnetic coil, allowing for reduced magnetic attractive force and controlled torque capacity through adjustable current supply, enabling self-locking and easy engagement/release states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic force is increased to ensure reliable engagement, then engagement reliability is improved, but energy consumption increases
Solution Approach 1:
The patent employs a cam mechanism that converts rotational motion into axial thrust dynamically. The cam profile is designed to generate variable thrust during engagement, providing high force when needed while reducing force during maintenance, thus improving reliability without continuous high energy consumption
Solution Approach 2:
The spring-loaded cam mechanism provides self-locking capability where the engagement force is maintained by the mechanical spring force rather than continuous electromagnetic force, allowing the system to maintain engagement state without continuous energy input
2Force
If large current is passed through to release the clutch, then release force is sufficient, but energy efficiency deteriorates
Solution Approach 1:
The patent replaces the traditional electromagnetic release mechanism with a mechanically assisted release system. The cam mechanism and spring combination provides the release force mechanically, eliminating the need for large reverse currents and significantly improving energy efficiency
3Power
If friction force is used for engagement, then torque transmission is achieved, but friction surface endurance deteriorates
Solution Approach 1:
The cam mechanism provides dynamic control of engagement force, allowing the friction surfaces to experience variable loads rather than constant high stress. This dynamic loading pattern reduces wear accumulation and extends friction surface life while maintaining adequate torque transmission capability
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 apparatus reduces energy consumption by minimizing the magnetic attractive force needed for engagement, allows for independent torque control, and enhances the endurance of friction surfaces, maintaining engagement without continuous electric current.
Implementation Method 1
an attracting member that creates the torque difference by friction force that is produced by attracting at least one of the cam members into contact with the attracting member by magnetic attraction force
Implementation Method 2
a cam mechanism that has a pair of cam members disposed facing each other in an axis direction, and that produces thrust in the axis direction according to torque difference between the cam members
Implementation Method 3
a first return spring that exerts elastic force on the attracted member in such a direction as to move the attracted member away from the attracting member against the magnetic attractive force
Data Source
AI summary
An apparatus includes: a cam that has two cam members disposed facing each other and produces thrust in an axis direction; an attracting member that creates friction force by attracting the cam members into contact with the attracting member by magnetic attraction force; an attracted member that is attached to one cam member of the two so as to rotate integrally together with the one cam member and be relatively movable in the axis direction, and that is attracted by the attracting member into contact with the attracting member so that the friction force is produced; a first return spring that exerts elastic force on the attracted member so as to move the attracted member away from the attracting member against the magnetic attractive force; and a second return spring that exerts elastic force on the one cam member.