Load Wheel Axle Keeper Assembly for Stable Mounting Access
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Solution Overview
Problem
Conventional load wheel assemblies for industrial vehicles face issues with axial and rotational movement of axles, leading to wear and damage, and do not provide convenient access for maintenance or lubrication, often requiring disassembly and risking damage from side-swipe impacts.
Innovation Solution
A keeper system is integrated with the axle and frame member, using a fastener offset from the axle's longitudinal axis to prevent rotational and axial movement, allowing easy access to the load wheel and lubrication without full disassembly, and features like chamfered edges and recessed designs reduce impact damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional load wheel assemblies are designed with traditional axle mounting, then the structure is simple, but the axle experiences unwanted axial and rotational movement causing wear and damage
Solution Approach 1:
The keeper is pre-formed with a flattened edge and is positioned on the axle before the side plate is installed. The flattened edge is inserted into a groove in the side plate, preventing rotational and axial movement of the axle before final assembly is complete. This preliminary positioning action ensures the axle is constrained against unwanted movement throughout the assembly process.
Solution Approach 2:
The axle mounting system is divided into separate functional components: the keeper (with flattened edge), the side plate (with groove), and the fastener. This segmentation allows each component to perform its specific function - the keeper prevents rotation, the groove provides guidance, and the fastener secures the assembly - while maintaining overall simplicity of the load wheel assembly structure.
2Ease of operation
If the load wheel assembly is designed for easy maintenance access, then maintenance is convenient, but the axle may become loose or unstable
Solution Approach 1:
The keeper with its flattened edge is installed on the axle before the side plate is attached to the load wheel assembly. This preliminary action creates a permanent mechanical constraint that prevents the axle from becoming loose during maintenance operations. The flattened edge in the groove design ensures the axle maintains its position even when the assembly is partially disassembled for maintenance access.
3Ease of manufacture
If components protrude outward from the load wheel assembly, then assembly is straightforward, but protruding components are vulnerable to side-swipe impact damage
Solution Approach 1:
The keeper is merged with the side plate assembly through the groove design, where the flattened edge of the keeper fits into the groove formed by the side plate. This merging integrates the axle retention function into the existing side plate structure, eliminating the need for separate protruding retention components that would be vulnerable to impact damage.
4Device complexity
If the fastener is positioned on the longitudinal axis of the axle, then the design is symmetric and simple, but access to lubrication points becomes difficult
Solution Approach 1:
The fastener is deliberately positioned asymmetrically, offset from the longitudinal axis of the axle. This asymmetric positioning creates an opening in the side plate that is not blocked by the axle itself, providing direct access to the lubrication point. The asymmetric design trades symmetric simplicity for practical operability during maintenance operations.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A load wheel assembly (40, 60) is provided with: a frame member (46, 66); a side plate (42, 62) coupled to the frame member (46, 66); an axle (50, 70) extending between the frame member and the side plate; and a keeper (52, 72) coupled by a fastener (54, 74) to the frame member (46, 66) or the side plate (42, 62). The keeper is coupled to one end of the axle to prevent rotational and axial movement of the axle relative to the frame member and the side plate.