Single-Slot Loader Slot Bearing for Higher Axial Load Capacity
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Solution Overview
Problem
Traditional loader slot bearings with two slots reduce axial load capacity due to metal-to-plastic contact, leading to increased wear and reduced static load retention.
Innovation Solution
A loader slot bearing design featuring a single slot with a truncated ball and annular housing, where the ball is rotatably retained by a concave inner bearing surface, allowing angular misalignment and improved retention through a molded liner and insert, enhancing both axial and radial support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If two slots are used in the bearing, then the ball is retained during radial loads, but the axial load capacity is reduced due to metal-to-plastic contact
Solution Approach 1:
The bearing surface is segmented into two distinct zones: a first zone with a slot that provides ball retention during radial loads, and a second zone without a slot that maintains metal-to-metal contact for axial load capacity. This segmentation allows each zone to optimize for its specific function without compromising the other.
Solution Approach 2:
Different regions of the bearing surface are given different qualities: the first zone has plastic material in the slot area to retain the ball during radial loading, while the second zone maintains continuous metal-to-metal contact for axial loading. This local differentiation resolves the contradiction by allowing each region to excel at its specific function.
2Ease of operation
If plastic molded material is used in the slots, then the ball is retained during radial loads, but the load capacity is reduced
Solution Approach 1:
The bearing is divided into functional zones where plastic material is applied only in the first zone with the slot for ball retention, while the second zone maintains metal-to-metal contact for full load capacity during axial loading.
Solution Approach 2:
Plastic material is applied locally only where needed for ball retention in the slotted zone, while leaving the unslotted zone as metal-to-metal contact for maximum load bearing capacity.
3Stability of the object's composition
If metal-to-metal contact is maintained, then the rod end remains stiff during radial loads, but wear on the bearing increases
Solution Approach 1:
The bearing surface is segmented so that metal-to-metal contact is maintained only in the unslotted second zone for radial load stiffness, while the slotted first zone uses plastic material to reduce wear during ball retention.
Solution Approach 2:
Different material contact qualities are applied locally: metal-to-metal contact in the unslotted zone for stiffness during radial loading, and plastic-mediated contact in the slotted zone to reduce wear during ball retention.
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 design increases axial load capacity and reduces wear by maintaining metal-to-metal contact during axial loads while providing improved rotational retention and support for the truncated ball.
Implementation Method 1
The truncated ball is positioned in the slot and rotated so that the truncated ball is rotatably retained by the inner bearing surface
Data Source
AI summary
A loader slot bearing includes a housing and a truncated ball. The housing has an interior area that is defined by an inner bearing surface which has a concave contour defining a circumference. A single slot extends axially partway into the inner bearing surface and has a slot arc section area extending axially inward. The slot arc section area has a first circumferential slot-end, a second circumferential slot-end, and a slot arc length measured between the first circumferential slot-end and the second circumferential slot-end. A ratio of the slot arc length to the circumference of the interior area is about 0.20 to 0.35. The truncated ball has a convex exterior surface. The truncated ball is positioned in the slot and rotated so that the truncated ball is rotatably retained by the inner bearing surface. The truncated ball is angularly misalignable relative to the annular housing.