Blind Bearing Puller With Separable Ball Bearing Expansion
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Solution Overview
Problem
Existing blind bearing pullers experience high friction and reduced lifespan due to the integral tapered face of the drive bolt wearing against the collet, increasing the force required to expand and tighten the tool.
Innovation Solution
A separable blind bearing puller with a ball bearing as the expansion device, allowing for reduced friction and easy replacement of worn parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an integral tapered face drive bolt is used to expand the collet, then the bearing can be pulled out, but high friction is created between the tapered face and the collet, increasing the force required to tighten the drive bolt
Solution Approach 1:
The expansion device is separated from the drive bolt, allowing the drive bolt to rotate without directly contacting the collet. The expansion device is activated by a separate mechanism (button or lever) that pushes the collet outward, eliminating the friction problem between the drive bolt and collet while maintaining the expansion function.
Solution Approach 2:
An intermediary expansion device is introduced between the drive bolt and the collet. This intermediary component transmits the expansion force without creating direct frictional contact between the drive bolt and collet, reducing energy loss and allowing smoother operation.
2Ease of operation
If the tapered face of the drive bolt is used to expand the collet, then the bearing can be removed, but the tapered face wears against the inside of the collet, reducing the lifespan of the tool
Solution Approach 1:
By separating the expansion device from the drive bolt, the wear-prone tapered face is isolated from direct contact with the collet. The drive bolt becomes a simple rotational component without the tapered face, extending its lifespan while maintaining the bearing removal function through the separate expansion device.
Solution Approach 2:
The expansion device is designed as a separate, replaceable component that can be easily worn or damaged without affecting the drive bolt. When wear occurs, only the expansion device needs replacement, not the entire tool, making the wear-prone component disposable or easily replaceable.
3Ease of operation
If the flexible fingers are inserted into the central aperture and then expanded using the tapered face, then the bearing can be grasped and pulled, but the friction created reduces the outward force needed to expand the flexible fingers
Solution Approach 1:
The expansion function is separated from the drive bolt mechanism. The flexible fingers are inserted first, then a separate expansion device is activated to push them outward. This segmentation allows the expansion force to be applied directly to the fingers without the frictional losses that occur when the tapered face contacts the collet, improving the efficiency of the expansion process.
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
Reduces friction and extends the tool's lifespan by evenly distributing wear and enabling easy replacement of the ball bearing expansion device.
Implementation Method 1
the ball bearing can rotate freely so that wear is more evenly distributed as it is free to turn
Implementation Method 2
wear is more evenly distributed as it is free to turn
Implementation Method 3
the tool reduces friction created with the radial force between the drive bolt and the engagement area of the collet
Data Source
AI summary
A separable blind bearing puller, having a main body assembly having a collet and a drive bolt and an expansion device, which is separable from the main body assembly, where the expansion device is preferably a ball bearing.