Sensor Bearing Hook Structure for Detachable Magnetic Ring Fixing
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Solution Overview
Problem
Existing sensor-equipped bearings face issues with magnetic ring fixation due to press-fitting, leading to potential inner ring contraction, difficulty in detachment, and limited reusability, especially when the inner ring width is small.
Innovation Solution
A sensor-equipped bearing design using a resin hook member with an outer peripheral groove to engage the magnetic ring, allowing elastic deformation for fixation without large radial interference, enabling easy detachment and improved reusability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the metal core of the magnetic ring is press-fitted into the outer peripheral portion of the inner ring, then the magnetic ring is fixed in position, but the radially inner surface of the inner ring may contract due to press-fitting
Solution Approach 1:
The patent introduces a resin layer as an intermediary substance between the metal core and the inner ring. This resin layer acts as a buffer that distributes the press-fitting pressure, preventing direct contact between the metal core and the inner ring's radially inner surface, thereby avoiding contraction while still achieving secure fixation of the magnetic ring
Solution Approach 2:
The patent changes the material parameter of the coupling medium from direct metal-to-metal contact to metal-to-resin contact. The resin material has different mechanical properties (lower modulus, higher elasticity) that allow it to deform and absorb press-fitting stresses, preventing the harmful contraction effect on the inner ring
2Stability of the object's composition
If the metal core of the magnetic ring is press-fitted on the outer peripheral portion of the inner ring, then the magnetic ring is fixed, but it is difficult to detach the magnetic ring without damaging it
Solution Approach 1:
The resin layer serves as a detachable intermediary that allows the magnetic ring to be removed from the inner ring without damage. The resin's elastic properties enable it to be compressed during assembly and then expanded to release the metal core during disassembly, facilitating easy detachment and reuse of the magnetic ring
Solution Approach 2:
The patent creates a dynamic fixation system where the resin layer can transition between compressed and expanded states. During assembly, the resin is compressed to secure the magnetic ring; during disassembly, the resin expands to release it, enabling easy removal and reuse without damage to the magnetic ring
3Length of moving object
If the width of the inner ring is small, then the bearing size is reduced, but the width of the fitting portion for press-fitting cannot be sufficiently ensured
Solution Approach 1:
The patent changes the material parameters of the coupling system by introducing resin with elastic properties. This allows the fitting portion to achieve sufficient fixation stability through elastic deformation and pressure distribution rather than relying solely on large dimensional parameters, enabling secure fixation even with limited inner ring width
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
Prevents inner ring contraction, allows magnetic ring fixation even with small inner ring widths, and enhances reusability by facilitating easy detachment without damage.
Implementation Method 1
a magnetic rubber member fixed to the metal core, wherein the magnetic rubber member has N poles and S poles alternately in the circumferential direction
Implementation Method 2
The magnetic sensor unit converts the change in the magnetic field into an electric signal and outputs the electric signal
Implementation Method 3
an outer peripheral groove is formed in the outer peripheral portion of the inner ring so as to circumferentially extend, wherein the hook member has a protrusion engaged in the outer peripheral groove of the inner ring
Data Source
AI summary
A sensor-equipped bearing is provided which includes a rolling bearing and a magnetic rotation sensor, and which further includes a hook member formed into an annular shape using a resin. The magnetic rotation sensor includes a magnetic ring coupled to an outer peripheral portion of an inner ring; and a magnetic sensor unit coupled to an outer ring. The magnetic ring includes a magnetic rubber member fixed to an annular metal core. The outer peripheral portion of the inner ring is formed with an outer peripheral groove circumferentially extending. The hook member includes a protrusion engaged in the outer peripheral groove of the inner ring. A metal core is held by the hook member.