Torque Wrench Test Bed Sliding Handle Mechanism
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Solution Overview
Problem
Existing actuating devices for testing torque wrenches suffer from high friction between the handle and the support surface, leading to jerky movements and inaccurate measurement results, especially with light or soft-handled torque wrenches, causing distortions outside the tolerance range.
Innovation Solution
The introduction of a sliding mechanism with horizontal and vertical components that allow for low-friction sliding of the handle in the handle holder, utilizing designs such as ball or roller bearings, sleeves, or slide-like surfaces to minimize frictional forces and ensure precise calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the handle is fixed directly to the support surface in the handle holder, then the structure is simple and stable, but high friction occurs between the handle and support surface causing jerky movements and inaccurate measurements
Solution Approach 1:
A sliding body is introduced as an intermediary element between the handle and the support surface. The sliding body features a sliding surface that contacts the handle and another sliding surface that contacts the support, enabling low-friction relative movement. This mediator resolves the contradiction by eliminating direct high-friction contact while maintaining structural simplicity through the use of guide surfaces.
Solution Approach 2:
The friction parameter between the handle and support surface is changed by introducing a sliding mechanism. The sliding body with its guided sliding surfaces transforms the high-friction direct contact into low-friction guided movement, fundamentally changing the friction parameter from high to low while enabling accurate torque measurements.
2Stability of the object's composition
If the handle is held firmly by the handle holder to prevent movement, then positioning stability is improved, but friction increases causing measurement distortions especially at low torques
Solution Approach 1:
The sliding body acts as an intermediary that provides both stability and low friction. It is guided on fixed guide surfaces in the handle holder, which provides positional stability, while the sliding interfaces enable low-friction movement that prevents measurement distortions. This resolves the contradiction between stability and measurement accuracy.
Solution Approach 2:
The handle holder structure is made dynamic by allowing the sliding body to move relative to the fixed guide surfaces. This dynamic capability enables the system to adapt to handle movement during torque application while maintaining stable positioning through the guided sliding mechanism, resolving the contradiction between firm holding and friction-free movement.
3Power
If a linear drive with spindle and crank is used to deflect the handle bracket, then torque generation is effective, but the handle must move in circular motion requiring complex movable mounting
Solution Approach 1:
The sliding body serves as an intermediary that simplifies the handle mounting. Instead of requiring complex movable mounting to accommodate circular handle motion, the sliding body with its guided surfaces provides a simple linear sliding mechanism that converts the circular motion requirement into straightforward guided movement, reducing structural complexity while maintaining effective torque generation.
4Measurement precision
If the sensor is rotatably mounted to allow handle deflection, then torque measurement is enabled, but friction at the rotation interface causes measurement errors
Solution Approach 1:
The sliding body is introduced as an intermediary between the handle and the rotation interface. It features low-friction sliding surfaces that contact the handle, preventing direct high-friction contact at the rotation interface. This mediator reduces frictional harmful factors while preserving the torque measurement capability of the rotatably mounted sensor.
Solution Approach 2:
The high-friction mechanical rotation interface is partially replaced by a low-friction sliding mechanism. The sliding body with its guided surfaces substitutes the direct rotational contact with a sliding motion that has significantly lower friction, reducing measurement errors while maintaining the essential rotational measurement function.
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 eliminates disruptive frictional forces, enabling precise and reproducible torque measurements, even for small test torques, and allows for the accurate calibration of torque wrenches, reducing measurement errors and ensuring results within specified tolerance limits.
Implementation Method 1
utilizing designs such as ball or roller bearings
Implementation Method 2
utilizing designs such as ball or roller bearings
Implementation Method 3
low-friction sliding of the handle in the handle holder
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The torque wrench test bed (10) has a carrier to secure the test wrench (26). A meter (16) is coupled to the wrench head (24) and a grip holder (36) is at the wrench handle (42). A mechanism (52) applies a torque to the wrench and a sliding guide (68) gives the handle a friction-free horizontal and vertical movement in the grip holder.