Electromagnetic Clutch Integrated Rotation Stop Member
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Solution Overview
Problem
Conventional electromagnetic clutches for power transmission devices, such as lawn mowers and snow blowers, have high manufacturing costs due to complex and costly components like the rotation stop plate, which requires burring and cutting work, as well as welding operations.
Innovation Solution
The electromagnetic clutch design simplifies the rotation stop member by integrating a flat portion with a retaining piece that supports the bearing directly within the field core, eliminating the need for burring and cutting work, and omitting the abutment plate, thus reducing manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional rotation stop plate with burring and cutting work is used, then the bearing can be supported, but the manufacturing cost increases
Solution Approach 1:
The invention merges the rotation stop plate and abutment plate into a single integrated rotation stop member. The rotation stop member includes a flat portion that supports the bearing and a retaining piece that protrudes into the hollow portion of the field core to retain the bearing, eliminating the need for separate burring, cutting, and welding operations while maintaining reliable bearing support
Solution Approach 2:
The rotation stop member performs multiple functions: it stops rotation of the field core, supports the bearing, and retains the bearing through its retaining piece. This multi-functional design replaces multiple separate components and operations, reducing manufacturing complexity and cost
2Reliability
If welding operations are performed to attach the abutment plate, then the bearing is retained, but the manufacturing complexity increases
Solution Approach 1:
The abutment plate function is merged into the rotation stop member as an integrated retaining piece. This retaining piece protrudes into the hollow portion of the field core to retain the bearing, eliminating the need for separate welding operations while maintaining reliable bearing retention
Solution Approach 2:
The invention extracts the welding operation from the manufacturing process by designing the retaining piece to retain the bearing through mechanical interference fit or similar means, removing the complex welding step while maintaining bearing retention reliability
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 design reduces the manufacturing cost of the electromagnetic clutch by simplifying the fabrication of the rotation stop member and eliminating unnecessary components, making the clutch more affordable while maintaining functionality.
Implementation Method 1
an exciting coil 13 housed in the annular groove 12a
Implementation Method 2
the armature 24 is magnetically attracted by the rotor 4
Implementation Method 3
The leaf spring 23 biases the armature 24 in a direction (forward) in which the armature 24 is spaced apart from the rotor 4
Implementation Method 4
the first bearing 10 housed in the hollow portion of the field core 12
Data Source
AI summary
An electromagnetic clutch includes a first rotation transmission portion, annular field core, rotation stop member, second rotation transmission portion, armature, and spring member. The annular field core is supported by the first rotation transmission portion via a first bearing. The first bearing is housed in a hollow portion of the field core and fitted on an inner circumferential surface of the field core. The rotation stop member includes a flat portion which is fixed to an end of the field core on a side opposite to the armature. The flat portion is formed integrally with a retaining piece which projects toward the hollow portion of the field core and faces the first bearing when viewed from the axial direction of the field core.