Wheel End Spindle Socket Hub for Self-Aligning Axle Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for connecting spindles to axles in non-drivable and non-steerable trailer axles require elaborate and costly jigging to ensure concentricity and perpendicularity, leading to increased stress on welds and higher production costs.
Innovation Solution
The implementation of a spindle with an internal tube pilot journal and an extended spindle socket hub, allowing for self-jigging and reduced stress on welds by accommodating bending stresses, thereby enabling a larger internal cavity and lower weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional welding methods (butt welding, loose fit extension welded, flat back welding) are used to connect spindle to axle, then the spindle can be connected to the axle, but elaborate alignment jigs are required to assure concentricity and perpendicularity, increasing device complexity and manufacturing cost
Solution Approach 1:
The spindle is designed with a self-aligning feature where the outer surface of the spindle acts as a reference surface that automatically guides the axle tube into correct concentric and perpendicular alignment during welding, eliminating the need for external alignment jigs. The spindle essentially aligns itself with the axle tube through its geometric features.
Solution Approach 2:
A reference surface is introduced as an intermediary element between the spindle and axle tube. This reference surface serves as a common datum that both components interface with, ensuring proper alignment without requiring complex external jigs. The reference surface acts as a mediator that transfers alignment information from the spindle to the axle tube.
2Strength
If traditional welding methods are used, then the spindle can be connected to the axle, but bending stresses are imposed on the weld, increasing stress on the welding joint
Solution Approach 1:
The bending stress is extracted from the weld joint by introducing a stress-absorbing structural feature between the spindle and axle tube. This feature takes the bending load away from the weld, allowing the weld to primarily handle shear and tensile loads rather than combined bending and shear loads.
Solution Approach 2:
A stress-absorbing feature is built into the spindle-axle connection before welding occurs. This feature acts as a cushion that absorbs bending stresses in advance, protecting the weld joint from excessive stress during service. The cushioning effect is built into the geometry of the connection.
3Weight of moving object
If traditional spindle design is used, then the spindle can be manufactured, but the internal cavity is limited in size, increasing weight
Solution Approach 1:
The spindle design incorporates a stress-absorbing feature that is formed during manufacturing but does not interfere with the welding process. This preliminary structural feature is built in advance to absorb bending stresses, allowing the internal cavity to be enlarged for weight reduction without compromising weld integrity or structural strength.
Data Source
Figure 1
Figure 2~2A
Figure 2B~2C
AI summary
A spindle for a wheel end assembly includes a first end of the spindle receiving the wheel of a vehicle on a first side of the wheel end assembly, and a second end of the spindle defining a flange and receiving the axle of a vehicle is disclosed. The flange includes a socket joint that receives the axle on the second side of the wheel end assembly. Mounting members extend distally from the second side a first distance to secure the spindle to the wheel end assembly via the flange. The socket joint of the spindle extends from the second side of the wheel end assembly a second distance from the second side. The second distance is greater than the first distance. A third distance represents degree of overlap of the axle by a ratio with respect to the outer diameter of the axle ranging from 8% to 20%.