Electromagnetic Brake Yoke Integrating Rotational Support
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Solution Overview
Problem
The existing electromagnetic brake systems for force sense imparting type rotation input apparatuses are bulkier due to the need for separate bearings to support the rotation shaft, increasing the radial size and manufacturing costs.
Innovation Solution
The electromagnetic brake system integrates a ring-shaped yoke with a concave groove and protruded shaft portion, allowing the rotation shaft to be directly supported without separate bearings, enabling concentric rotation and reducing the system's radial size while omitting the need for bearing mounting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate bearings are arranged between the case type core and the rotation shaft to support the rotation shaft, then the rotation shaft can be pivotally supported, but the radial size of the entire system increases
Solution Approach 1:
The patent merges the bearing function into the yoke structure itself. The inner cylinder portion of the yoke forms a bearing surface that directly supports the rotation shaft, eliminating the need for separate bearing components. This integration maintains rotational support reliability while reducing radial size by consolidating multiple functions into a single structural element.
Solution Approach 2:
The yoke structure is designed to serve multiple functions simultaneously: it provides the electromagnetic magnetic circuit, structural support, and rotational bearing surface through its inner cylinder portion. This multi-functionality eliminates the need for dedicated bearing components, reducing radial dimensions while maintaining support capability.
2Reliability
If separate bearings are arranged to support the rotation shaft, then the rotation shaft can be pivotally supported, but the manufacturing cost increases due to additional mounting processes
Solution Approach 1:
By integrating the bearing surface into the yoke's inner cylinder portion, the patent eliminates separate bearing components and their associated mounting operations. This reduces manufacturing complexity and cost while maintaining reliable rotational support through the yoke's structurally integrated bearing surface.
3Reliability
If the yoke has a hole portion for inserting the rotation shaft and separate bearings are arranged, then the rotation shaft can be supported, but the radial size increases
Solution Approach 1:
The patent combines the rotational support function directly into the yoke structure. The inner cylinder portion of the yoke forms an integrated bearing surface that supports the rotation shaft without requiring separate bearing components, thereby maintaining reliable rotation support while minimizing radial dimensions.
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
This configuration miniaturizes the system, reduces manufacturing costs, and enhances the rotation restraining force by concentrating magnetic flux, allowing for a larger brake torque within a smaller size.
Implementation Method 1
attracts the friction plate using an electromagnetic force generated in the case type core through applying electricity to the winding
Implementation Method 2
The inner cylinder portion has a protruded shaft portion, which protrudes toward the friction plate and is rotatably inserted to the second hole portion. The protruded shaft portion has an outer wall surface which is concentric with the first hole portion. The fixing member has a support portion, which rotatably supports the rotation shaft
Data Source
AI summary
A yoke core of an electromagnetic brake system includes a rotation shaft hole portion through which a rotation shaft is penetrated, and additionally includes an inner yoke portion and an outer yoke portion which are arranged on both inner and outer sides, by pinching a concave groove. A coil is accommodated in the concave groove and a magnetic flux is generated by applying electricity to attract an armature. The armature has a penetrating hole portion in the center, and a protruded shaft portion formed on the inner yoke portion is inserted to the penetrating hole portion. The rotation shaft has one side thereof rotatably supported by a support portion of a housing, and the other side thereof rotatably supported by the protruded shaft portion via the armature and a planetary gear mechanism. Accordingly, it is not necessary to provide bearings or the like.