Wheelend Grease Tool for Direct Inner and Outer Bearing Lubrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Unitized wheelend assemblies often have inner and outer bearings that are not pre-lubricated, making installation cumbersome and leading to uncertain lubrication levels, as conventional methods either require disassembly or rely on lubricant migration from the cavity, which is less effective due to viscous and limited flowability.
Innovation Solution
A grease system comprising an inner grease tool with a plug and an outer grease tool, both equipped with fluid conduits, allows for efficient lubrication delivery to the inner and outer bearings, using a cylindrical body or separate tools that can be coupled to deliver lubricant through inlets and outlets, with rotors and discs facilitating lubricant distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the unitized wheelend assembly is shipped fully assembled, then assembly complexity is reduced and installation is simplified, but the bearings are dry and require additional lubrication steps
Solution Approach 1:
The grease delivery system is pre-installed in the wheelend assembly during manufacturing, with grease reservoirs and delivery channels prepared in advance. This allows the bearings to be lubricated immediately upon installation without requiring disassembly or additional lubrication steps, thus maintaining the benefits of unitized assembly while solving the dry bearing problem
Solution Approach 2:
The wheelend assembly includes self-contained grease reservoirs and automatic delivery mechanisms that provide lubrication to the bearings automatically during operation. The system uses the wheelend's own operational movements to distribute grease from the reservoirs to the bearing surfaces, eliminating the need for external lubrication intervention
2Reliability
If the wheelend assembly is disassembled to pack bearings with lubricant, then proper lubrication is achieved, but the assembly process becomes cumbersome and difficult
Solution Approach 1:
The grease delivery system is divided into separate functional components: grease reservoirs, delivery channels, and distribution points at each bearing location. This segmentation allows each component to be manufactured and tested independently, then assembled into the complete wheelend assembly, simplifying the overall manufacturing process while ensuring proper lubrication
Solution Approach 2:
The grease delivery system acts as an intermediary mechanism between the grease reservoirs and the bearings. Instead of requiring direct contact or manual application, the delivery channels and distribution mechanisms mediate the transfer of lubricant, ensuring consistent and adequate lubrication without complex manual assembly steps
3Ease of operation
If lubricant is placed in the cavity hoping it will migrate to bearings, then installation is simplified, but lubrication level is unknown and flowability is limited
Solution Approach 1:
The grease delivery system uses hydraulic pressure differentials created during wheelend operation to automatically pump grease from the reservoirs through delivery channels to the bearings. The system leverages the natural pressure changes that occur during mounting and operation to ensure consistent grease flow and adequate lubrication without requiring complex external pumping equipment
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
Enables efficient and controlled lubrication of both inner and outer bearings, simplifying the installation process and ensuring consistent lubrication levels, thereby addressing the challenges of dry bearings in unitized wheelend assemblies.
Implementation Method 1
an outlet, formed in the sidewall of the plug, in fluid communication with the fluid conduit such that lubrication can be delivered from a lubrication source to the inner bearing
Implementation Method 2
The outer grease tool comprises an inlet and an outlet, where the outlet is proximal the outer bearing, to place the lubrication source in fluid communication with the outer bearing
Data Source
AI summary
A grease tool for a unitized wheelend assembly is provided. The grease tool may have a plug with a fluid conduit to place a lubrication source in fluid communication with an inner bearing and a cap with a fluid conduit to place the lubrication source in fluid communication with an outer bearing. The grease tool may include a cylindrical body having an inner bearing support and an outer bearing support. The cylindrical body has an inner rotor and disc and an outer rotor and disc where the inner rotor and the outer rotor cause the discs to move between an extended and retracted position.