Bearing Attachment Structure Using Tapered Collar and Threaded Nut
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Solution Overview
Problem
Conventional methods for attaching and fixing bearings to shafts suffer from misalignment, difficulty in high-speed rotation, risk of surface scratches, and challenges in detachment, as well as displacement of the rolling position and reduction of internal gaps, which affect bearing performance.
Innovation Solution
A structure featuring a male thread and taper portion on the outer periphery of the inner ring with discission portions, combined with a fixing nut and collar that allows for easy attachment and detachment by threading and pressing mechanisms, minimizing misalignment and surface damage while maintaining internal gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a locking screw is used to attach the bearing to the shaft, then the attachment is simple, but misalignment of shaft centers increases and the structure is unsuitable for high-speed rotation
Solution Approach 1:
The patent introduces a collar as an intermediary component between the bearing and shaft. The collar features a conical inner surface that interfaces with a conical outer surface on the bearing, and an outer cylindrical surface that contacts the shaft. This intermediary structure distributes the attachment force uniformly, preventing misalignment while maintaining ease of installation through a single locking screw.
2Manufacturing precision
If an adapter sleeve with lock nut is used, then shaft center alignment improves, but the sleeve pulls the inner ring causing displacement of rolling position
Solution Approach 1:
The patent employs conical surfaces instead of cylindrical surfaces for the interface between the collar and bearing. The conical inner surface of the collar matches the conical outer surface of the bearing, creating a tapered interface that guides the bearing onto the shaft without radial pulling forces. This curved geometry eliminates displacement of the rolling position while achieving precise shaft center alignment.
3Strength
If the bearing is pressed on the larger-diameter side of the taper, then attachment is achieved, but the gap in the inner portion is reduced affecting bearing function
Solution Approach 1:
The patent inverts the conventional pressing approach by using a conical interface where the bearing's conical outer surface is pressed against the collar's conical inner surface, rather than pressing the bearing axially against a flat or cylindrical surface. This inverted conical geometry allows the bearing to be securely attached while maintaining its internal clearance, as the tapered interface distributes pressure away from the bearing's internal rolling elements.
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
Facilitates easy and rapid attachment and detachment of bearings with reduced misalignment, prevents surface scratches, maintains internal gap integrity, and supports both attachment and detachment processes without affecting bearing performance.
Implementation Method 1
a taper portion (7) is formed in the extension portion (4), and discission portions (8) are formed in the taper portion (7)
Data Source
AI summary
A male thread portion and a taper portion are provided in an outer periphery of an extension portion of an inner ring of a bearing, discission portions are formed in the taper portion at uniform intervals in a peripheral direction, female thread holes for fixing bolts are provided at uniform intervals in a peripheral direction, from a side surface, in a fixing nut which is threadably provided in the male thread portion, and bolt insertion holes and female thread holes are formed in a fixing collar which is fitted to the taper portion in the outer periphery of the extension portion in a taper portion in an inner periphery, the bolt insertion holes corresponding to the female thread holes of the fixing nuts from a side surface, and the female thread holes being provided for detaching bolts at uniform intervals in the peripheral direction.