Wave Spring Shim Adjustment for Precise Torque Limiter Preload
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Solution Overview
Problem
The existing methods for setting the preload in torque limiting devices using compression coil springs are time-consuming and require iterative assembly and machining of shims to achieve accurate preload, which is essential for reliable operation.
Innovation Solution
An edge wound wave spring assembly with a shim having radially projecting mounting lugs that can be easily adjusted by screwing and rotating the shim to achieve the desired preload, allowing for precise control of the spring's axial length without the need for disassembly and machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a compression coil spring with a shim is used to set the preload in a torque limiting device, then the preload can be adjusted, but the process requires iterative assembly and machining of the shim which is time-consuming
Solution Approach 1:
The shim is designed with a threaded bore that allows it to be rotated relative to the spring, dynamically adjusting the axial position of the shim along the spring axis. This rotational movement translates to axial displacement, enabling continuous adjustment of the preload force without requiring disassembly or machining operations.
Solution Approach 2:
The preload force is adjusted by changing the axial position parameter of the shim along the spring axis. By rotating the shim through its threaded engagement with the spring, the axial distance between the shim and the spring end changes, thereby modifying the preload force applied by the spring in a controlled and reversible manner.
2Manufacturing precision
If the shim thickness is changed by machining to achieve accurate preload, then the preload precision is improved, but the process becomes complex and time-consuming
Solution Approach 1:
Instead of permanently altering the shim thickness through machining, the invention uses a dynamic adjustment mechanism where the shim can be rotated to change its axial position relative to the spring. This transforms a static, irreversible machining process into a dynamic, reversible rotational adjustment, simplifying the overall process while maintaining precision.
Solution Approach 2:
The invention replaces the traditional mechanical machining system (grinding equipment, fixtures, and operators) with a simpler threaded rotational adjustment system. The threaded bore in the shim engages with the spring, allowing precise axial positioning through simple rotation rather than complex machining operations.
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
This solution enables quick and precise adjustment of the preload in torque limiting devices, reducing the time and effort required to achieve the correct operational torque limit, enhancing the reliability and efficiency of the device.
Implementation Method 1
The edge wound wave spring comprises a plurality of axially spaced, axially compressible wave-like turns
Data Source
AI summary
A spring assembly comprises an edge wound wave spring and a shim. The spring comprises a plurality of axially spaced, axially compressible wave-like turns extending between a first end portion and a second end portion. The first end portion comprises a plurality of closely arranged parallel turns. The shim comprises a shim body and at least one mounting lug projecting radially from the shim body. The mounting lug is received between adjacent turns of the first end portion of the edge wound wave spring for retaining the shim to the edge wound wave spring.