Sensor Bearing Unit Ribbed Interface for Secure Impulse Ring Mounting
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Solution Overview
Problem
Existing sensor bearing units face challenges with the angular mechanical connection between the impulse ring and the inner ring, which can become loose due to high speeds, thermal dilatation, or mechanical loads, leading to inaccurate signal measurements.
Innovation Solution
The sensor bearing unit incorporates a textured area on the bearing's surfaces, featuring a plurality of ribs and grooves, with a soft coating on the target holder's abutment and fixing portions, enhancing the angular connection by increasing the breaking torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional mechanical connection is used between the impulse ring and the inner ring, then the structure is simple, but the connection becomes loose under high speeds, thermal dilatation, or mechanical loads
Solution Approach 1:
The patent applies local quality by providing a textured area with ribs and grooves only at the specific contact surface between the impulse ring and inner ring, rather than modifying the entire structure. This localized texturing creates engagement features precisely where needed to prevent loosening, while keeping the rest of the bearing structure simple and conventional.
Solution Approach 2:
The textured area with ribs and grooves is pre-formed on the inner ring surface before assembly. When the impulse ring is installed, the soft coating material is pressed into these pre-formed grooves, creating a mechanical interlock that prevents loosening from the outset. This preliminary preparation of the engagement features ensures reliable connection without requiring complex assembly procedures.
2Strength
If the target holder is made of hard material for durability, then strength is improved, but the angular connection becomes prone to loosening
Solution Approach 1:
The patent employs composite materials by combining a hard substrate material (providing strength and durability) with a soft coating layer (providing engagement capability). The hard material maintains structural integrity under mechanical loads, while the soft coating deforms to engage with the textured area, creating a reliable angular connection that leverages the complementary properties of both materials.
Solution Approach 2:
The patent changes the physical parameter of the target holder surface by adding a soft coating layer with different mechanical properties than the bulk hard material. This coating layer has sufficient softness to deform and engage with the grooves in the textured area, while the underlying hard material provides the necessary strength. This parameter change at the surface level resolves the contradiction between hardness and engagement capability.
3Reliability
If the mechanical connection is strengthened to prevent loosening, then connection stability is improved, but the risk of damage under high loads increases
Solution Approach 1:
The patent changes the mechanical parameter of the connection interface by introducing a soft coating layer that can elastically deform under high loads. This allows the connection to accommodate thermal dilatation and mechanical stress without creating rigid constraints that could lead to damage. The soft coating acts as a buffer that absorbs stress while maintaining engagement.
Solution Approach 2:
The soft coating layer serves as a pre-formed cushioning element at the connection interface. When high loads or thermal expansion occur, this soft layer compresses and deforms to absorb the stress, preventing the rigid hard materials from damaging each other. This beforehand cushioning protects the connection from damage while maintaining reliability under extreme conditions.
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 textured area with a soft coating improves the angular connection between the impulse ring and the inner ring, ensuring accurate signal measurements by maintaining a secure mechanical link despite high-speed operations and varying mechanical loads.
Implementation Method 1
The plurality of ribs are engaged, at least partially, inside the soft coating which is deformed plastically under the compressive load
Data Source
AI summary
A sensor bearing unit comprising:a bearing comprising first and second rings, each provided with an outer cylindrical surface, an inner cylindrical surface, and lateral surfaces, andan impulse ring provided with a target holder being axially mounted against one of said lateral surfaces, and comprising a fixing portion secured to the first ring and coming into radial contact with said one of cylindrical surfaces and an abutment portion coming into axial contact with said lateral surface.Besides, at least one of the lateral and cylindrical surfaces is provided with a textured area comprising a plurality of ribs, and the abutment portion and/or the fixing portion of the target holder is made of a hard material and comprise a soft coating covering the hard material and inside which the ribs are engaged.