Dual Stage Spring Compression Torque Sensing Assembly
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Solution Overview
Problem
Existing torque sensing drives in agricultural machines require the entire assembly to be removed for maintenance, and disassembly involves the use of hydraulic presses due to constant coil spring compression, making serviceability cumbersome.
Innovation Solution
A dual stage spring compression mechanism that allows for sequential preload adjustments using first and second stage compression devices, enabling assembly and disassembly without removing the entire torque sensing drive, utilizing a spring retainer connected to an axially fixed sheave and a cam assembly between sheaves for adjustable compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant compression spring is used in the torque sensing drive, then the drive maintains torque responsiveness and functional reliability, but the entire assembly becomes non-serviceable and requires removal for maintenance
Solution Approach 1:
The spring compression mechanism is divided into two independent stages: a first stage compression device that pre-compresses the spring during assembly, and a second stage compression device that provides additional compression and can be independently adjusted. This segmentation allows the second stage to be serviced separately without removing the entire drive assembly, while the first stage maintains the spring's constant compression and torque responsiveness.
Solution Approach 2:
The first stage compression device performs the initial spring compression during assembly, establishing the baseline pre-load before the component is installed in the field. This preliminary action allows subsequent maintenance to focus only on the second stage adjustment mechanism, eliminating the need to remove the entire assembly for routine service.
2Stability of the object's composition
If a constant compression spring is used in the torque sensing drive, then the drive maintains functional stability, but disassembly requires hydraulic presses and specialized equipment
Solution Approach 1:
The compression mechanism is segmented into two independent stages with separate adjustment devices. The second stage compression device is designed as a standalone component that can be accessed and adjusted without specialized equipment, eliminating the need for hydraulic presses while maintaining the stable constant compression provided by the spring.
Solution Approach 2:
The spring retainer acts as an intermediary component that connects both compression stages and provides a accessible interface for adjusting the second stage compression. This mediator allows field service personnel to make adjustments using simple tools rather than requiring complex hydraulic equipment.
3Ease of repair
If the entire torque sensing drive assembly is removed for maintenance, then all components can be serviced, but maintenance time and machine downtime increase
Solution Approach 1:
The drive assembly is segmented into serviceable modules, with the second stage compression device designed as an independently accessible component. This allows maintenance personnel to service the compression mechanism in-place without removing the entire drive assembly from the machine, significantly reducing maintenance time and equipment downtime.
Solution Approach 2:
The second stage compression device is extracted as a separate, independently serviceable component from the main drive assembly. This extraction allows the compression mechanism to be adjusted and maintained without disturbing other drive components, enabling rapid in-field service and eliminating the need for complete assembly removal.
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
Facilitates easier assembly and disassembly of torque sensing drives in agricultural machines, reducing maintenance complexity and eliminating the need for hydraulic presses, while maintaining torque responsiveness through controlled sheave interaction.
Implementation Method 1
A compression spring has a first end and a second end, with the first end being positioned to engage the axially movable sheave
Implementation Method 2
The dual stage spring compression mechanism has a first stage compression device that compresses the compression spring by a first preload amount and a second stage compression device that compresses the compression spring by a second preload amount
Data Source
AI summary
A torque sensing assembly includes an axially fixed sheave having an axis of rotation, and an axially movable sheave movable along the axis in relation to the axially fixed sheave. A compression spring has a first end and a second end, with the first end being positioned to engage the axially movable sheave. A dual stage spring compression mechanism has a spring retainer that engages the second end of the compression spring. The dual stage spring compression mechanism is connected to the axially fixed sheave. The dual stage spring compression mechanism has a first stage compression device that compresses the compression spring by a first preload amount and a second stage compression device that compresses the compression spring by a second preload amount.