Torque-Limiting Spindle Nut for Accurate Bearing Preload
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Solution Overview
Problem
Conventional nut assemblies require complex procedures and specialized equipment to apply the correct torque for seating and preloading, often leading to improper bearing preloading, increased wear, and reduced lifespan due to lack of proper equipment or expertise.
Innovation Solution
A torque-limiting spindle nut with a threaded component and tool interface, featuring a cylindrical main body with detents and recesses, an elastic member providing compressive force for frictional coupling, and a washer coupled by a retainer device, allowing for controlled torque application without a torque wrench.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional nut assemblies are tightened without specialized equipment, then installation is simpler, but torque precision deteriorates leading to improper bearing preloading
Solution Approach 1:
The nut assembly performs its own torque control function through the elastic member and detent mechanism. When torque is applied during installation, the engagement members automatically disengage from the detents at the predetermined torque level, eliminating the need for external torque-wrench equipment and providing self-regulating torque control.
Solution Approach 2:
The patent replaces the mechanical torque-wrench system with an elastic member-based torque control mechanism. The elastic member deforms under applied torque and releases engagement members from detents when a predetermined torque threshold is reached, substituting complex mechanical measurement equipment with a simpler elastic-deformation-based control system.
2Measurement precision
If conventional nut assemblies use torque wrenches for precise torque application, then torque precision improves, but device complexity increases
Solution Approach 1:
The nut assembly integrates multiple functions into a single component: fastening, torque control, and installation guidance. The detent structure with engagement members provides both the fastening function and the torque-limiting function, while also guiding proper installation orientation, eliminating the need for separate torque-wrench equipment and complex procedures.
Solution Approach 2:
The patent combines the torque control mechanism directly into the nut assembly by integrating engagement members and detents. This merging of torque control functionality with the fastening component itself eliminates the need for separate torque-wrench tools and simplifies the overall installation procedure while maintaining precise torque control.
3Force
If conventional nut assemblies are over-tightened, then seating force improves, but bearing damage occurs
Solution Approach 1:
The nut assembly is pre-configured with engagement members positioned in detents that are designed to disengage at a predetermined torque level. This preliminary arrangement ensures that when installation torque is applied, the engagement members will automatically release at the correct moment, preventing over-tightening and bearing damage before it can occur.
Solution Approach 2:
The elastic member provides mechanical feedback during installation by deforming under applied torque and triggering the disengagement of engagement members from detents when the predetermined torque threshold is reached. This feedback mechanism automatically signals and limits the application of torque, preventing excessive force that could damage bearings while ensuring sufficient seating force.
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 accurate torque application for proper seating and preloading of bearings, reducing wear and extending lifespan by simplifying the installation process and eliminating the need for specialized tools.
Implementation Method 1
An elastic member in the spring groove is in contact with the plurality of engagement members and provides a compressive force tending to move the engagement members into the detents frictionally coupling the tool interface to the threaded component
Implementation Method 2
the compressive force provided by the elastic member is overcome at a predetermined torque such that the pin moves from the detent into the recess against the elastic member when the torque is equal to the torque limit
Implementation Method 3
provides a compressive force tending to move the engagement members into the detents frictionally coupling the tool interface to the threaded component
Data Source
AI summary
A torque-limiting nut is provided. The torque-limiting nut has a washer, a threaded component, and a tool interface. The threaded component has a plurality of detents and the tool interface has a corresponding plurality of recesses and a spring groove. A plurality of engagement members are sized and shaped to fit within the plurality of detents and recesses. An elastic member in the spring grooves provides a compressive force to seat the pins in the corresponding detents to frictionally couple the threaded component and tool interface. When a torque required to rotate the tool interface exceeds a predetermined value, the pin moves against the spring and unseats from the detent such that the tool interface rotates without rotating the threaded component.