Electromagnetic Friction Disk Clutch With Axial Bearing Overlap
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Solution Overview
Problem
Existing electromagnetic friction disk clutches for auxiliary units of internal combustion engines are not economically or technically advantageous, lacking compactness and ease of assembly, and do not provide an optimized magnetic action, which limits their applications and reliability.
Innovation Solution
The electromagnetic friction disk clutch features a rotor bearing unit offset from the electromagnet arrangement in an axial direction, allowing for a radially compact design with a reduced diameter, utilizing a permanent magnet for fail-safe operation and a non-magnetizable locking section to optimize magnetic flux and prevent magnetic short circuits, enabling efficient torque transmission and compact dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electromagnet arrangement and rotor bearing unit are arranged next to each other in the radial direction, then the magnetic action is effective, but the diameter of the friction disk clutch is large
Solution Approach 1:
The patent transitions from a radial arrangement to an axial arrangement of the rotor bearing unit relative to the electromagnet arrangement. The rotor bearing unit is positioned offset in the axial direction and overlaps with the electromagnet arrangement axially, converting a radial spatial relationship into an axial one. This dimensional change reduces the radial footprint and overall diameter of the friction disk clutch while maintaining functional effectiveness.
2Reliability
If a conventional electromagnetic friction disk clutch is used, then the structure is simple, but it lacks fail-safe operation capability
Solution Approach 1:
The patent introduces a non-magnetizable locking section as an intermediary element between the rotor bearing unit and the magnetic circuit. This locking section serves as a magnetic flux barrier that prevents magnetic short circuits and optimizes the magnetic flux path. By positioning this intermediary element appropriately, the system achieves fail-safe operation where the clutch maintains its frictionally locking connection even during power failures, without requiring complex additional safety mechanisms.
Solution Approach 2:
The patent segments the magnetic circuit by introducing the non-magnetizable locking section that divides and directs the magnetic flux paths. This segmentation creates distinct magnetic zones and prevents unwanted magnetic short circuits between different parts of the magnetic circuit, thereby improving reliability through controlled magnetic flux distribution.
3Volume of moving object
If the rotor bearing unit is positioned to overlap with the electromagnet arrangement axially, then the diameter is reduced, but the magnetic flux path may be affected
Solution Approach 1:
The non-magnetizable locking section acts as a strategic intermediary that manages magnetic flux in the overlapping axial arrangement. By positioning this magnetic barrier appropriately, the patent guides the magnetic flux through optimized paths that avoid short circuits through the rotor bearing unit, maintaining magnetic flux efficiency despite the compact axial overlapping configuration.
Solution Approach 2:
The patent applies local quality by making the locking section specifically non-magnetizable at the critical location where magnetic flux management is needed. This localized material property change allows the bearing unit to be made of magnetizable material for structural purposes while preventing magnetic short circuits only where needed, optimizing both compactness and magnetic efficiency.
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 achieves a 100% fail-safe, radially compact clutch with reduced diameter, ensuring continuous cooling function even in case of power failure, preventing overheating and enhancing the clutch's usability and reliability by maintaining frictional locking action and compact dimensions.
Implementation Method 1
a magnetic effect can be generated by way of an energization of the electromagnet arrangement for the connection of the armature disk to the rotor, which magnetic effect moves the armature disk in such a way that the armature disk can be connected to the rotor in a frictionally locking manner
Implementation Method 2
it being possible for a magnetic effect to be generated by way of an energization of the electromagnet arrangement
Implementation Method 3
the armature disk can be connected to the rotor in a frictionally locking manner
Data Source
AI summary
An electromagnetic friction disk clutch with a shaft, an electromagnet arrangement, a rotor for driving the shaft, and an armature disk which is connected to the shaft and moveable in a sprung manner in a direction which is axial to a shaft axis. In a shifting state of the friction disk clutch, the armature disk can be connected to the rotor in a frictionally locking manner, the rotor being mounted rotationally by a rotor bearing unit with respect to the housing section and with respect to the shaft, a magnetic effect is generated for connecting the armature disk to the rotor. The rotor bearing unit is offset with respect to the electromagnet arrangement in an axial direction with respect to the shaft, and overlaps the electromagnet arrangement in the axial direction with respect to the shaft.