Torque Testing Device with Non-Circular Body and Fluid Piston
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Solution Overview
Problem
Existing torque testing devices for impact tools are expensive, complex, and lack repeatability due to dependencies on system stiffness, wear, and lubrication, leading to variable test results.
Innovation Solution
A torque testing device with a non-circular cross-sectional body and a moveable portion that includes a core and piston, where the piston moves within the core to generate fluid pressure, allowing for accurate torque measurement by resisting further movement when fluid pressure balances the rotational force of the impact wrench.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional torque testing devices are used, then torque measurement can be achieved, but the devices are expensive and complex
Solution Approach 1:
The testing device is divided into distinct functional components: a body defining an interior volume, a moveable portion with core and piston, and a fluid chamber. This segmentation allows each component to perform its specific function independently, simplifying the overall device while maintaining measurement accuracy.
Solution Approach 2:
The device uses fluid pressure (pneumatics or hydraulics) to transmit and measure torque forces. The piston moves within the core to generate fluid pressure, which is then measured to determine torque output. This replaces complex mechanical transmission systems with a simpler fluid-based measurement mechanism.
2Measurement precision
If traditional torque testing devices are used, then torque measurement can be achieved, but repeatability is poor due to dependencies on system stiffness, wear, and lubrication
Solution Approach 1:
The invention extracts the measurement function from the mechanical transmission path. By using fluid pressure to transmit the torque measurement, the device eliminates dependencies on mechanical system stiffness, wear, and lubrication conditions that plague traditional mechanical testing devices, thereby improving repeatability and reliability.
Solution Approach 2:
The device changes the measurement parameter from direct mechanical force transmission to fluid pressure generation. The piston's movement within the core converts mechanical torque into fluid pressure, which is then measured. This parameter change removes sensitivity to mechanical wear and stiffness variations, ensuring consistent results.
3Measurement precision
If traditional torque testing devices are used, then torque measurement can be achieved, but frequent lubrication is required
Solution Approach 1:
By using fluid pressure as the measurement medium, the device eliminates the need for lubrication in the measurement path. The fluid chamber and piston-core interface do not require lubrication for accurate measurement, significantly reducing maintenance requirements and improving ease of operation.
4Ease of manufacture
If simple and economical testing devices are used, then cost is reduced, but measurement accuracy and repeatability suffer
Solution Approach 1:
The use of fluid pressure measurement provides a cost-effective alternative to complex mechanical measurement systems. The piston-core-fluid chamber assembly is simpler to manufacture than precision mechanical linkages, while the fluid pressure measurement itself provides high accuracy and repeatability, achieving both low cost and high precision.
Data Source
AI summary
A torque testing device includes a body defining an interior volume that is defined by an interior wall having a non-circular cross-section. A moveable portion is within the interior volume and is selectively movable from a first orientation within the interior volume to a second orientation within the interior volume. The moveable portion includes a core defining an aperture and a piston. A portion of the piston cooperates with the aperture of the core. When the moveable portion is in the first orientation, the piston is located at a first distance from the core. When the moveable portion is in the second orientation, the piston is located at a second distance from the core, the second distance being less than the first distance.