Torque Tool Differential Shaft Adjustment Mechanism
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Solution Overview
Problem
Conventional torque tools require numerous turns to adjust torque settings between the lowest and highest limit values, making them inconvenient to use.
Innovation Solution
A torque tool design featuring a main body with a non-rotatably and slidably disposed abutting assembly, a shaft with opposing threaded portions, and a rotatable adjusting assembly that drives the shaft to move axially, allowing for significant torque adjustment with less rotation by leveraging an elastic member and engagement mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional single-threaded adjusting mechanism is used, then the structure is simple, but many turns are required to adjust torque between limit values
Solution Approach 1:
The patent employs a nested threaded structure where an inner shaft with a first threaded portion is contained within an outer abutting assembly with a second threaded portion. Both threaded portions extend spirally in opposing directions, creating a differential mechanism where rotation of the inner shaft relative to the abutting assembly produces amplified axial displacement, thereby reducing the number of turns needed for torque adjustment.
Solution Approach 2:
The invention transitions from a single-dimensional rotational adjustment to a two-dimensional threaded interaction system. By incorporating concentric threaded portions with opposing spiral directions, the mechanism converts rotational motion into amplified axial displacement through the interaction of two threaded dimensions, achieving greater adjustment range per rotation.
2Ease of operation
If the abutting assembly is rotatably disposed, then the structure allows rotation, but it cannot effectively adjust torque through axial movement
Solution Approach 1:
The abutting assembly features an asymmetric design where the outer diameter of the inner shaft is smaller than the inner diameter of the abutting assembly, creating a constrained fit. This asymmetric dimensional relationship allows the abutting assembly to slide axially along the shaft while preventing relative rotation, enabling effective torque adjustment through controlled axial movement.
Solution Approach 2:
The elastic member acts as an intermediary between the abutting assembly and the torque adjustment mechanism. It transmits and amplifies the axial displacement of the abutting assembly into torque adjustment, while also providing force feedback and ensuring reliable engagement between the threaded portions.
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 considerable torque adjustment with fewer turns of the adjusting mechanism, enhancing usability by increasing the displacement of the abutting assembly relative to the main body, thus improving operational efficiency.
Implementation Method 1
a shaft (3), including a first threaded portion (31) and a second threaded portion (32), the first threaded portion (31) and the second threaded portion (32) extending spirally in opposing directions, the first threaded portion (31) being screwed to the main body (1), the second threaded portion (32) being screwed to the abutting assembly (21)
Data Source
AI summary
A torque tool is provided, including: a main body, defining an axial direction, an end of the main body on the axial direction including a working portion, the working portion being freely rotatable when receiving a torque larger than a predetermined torque; a torque assembly, including an abutting assembly, the abutting assembly being non-rotatably and slidably disposed in the main body in the axial direction for adjusting the predetermined torque; a shaft, including a first threaded portion and a second threaded portion, the first threaded portion and the second threaded portion extending spirally in opposing directions, the first threaded portion being screwed to the main body, the second threaded portion being screwed to the abutting assembly; an adjusting assembly, disposed on the main body and rotatable about the axial direction, connected with and non-rotatable relative to the shaft.