Scotch Yoke Air Compressor Driving Tool Torque Reduction
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Solution Overview
Problem
Existing driving tools face challenges in terms of convenience, portability, cost, and maintenance, particularly with pneumatic motors, internal combustion engines, and previous internal air compressor designs, which are either cumbersome, expensive, or require periodic maintenance.
Innovation Solution
A driving tool incorporating a motor and transmission system with a scotch yoke mechanism, featuring a first and second linear motor, a head assembly, and a nosepiece, where the scotch yoke mechanism includes a crank arm, crank arm roller, and connecting rod with a roller slot that varies the output rate to reduce the required rotational torque, enabling efficient air compression and fluid communication between cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a pneumatic motor with external air compressor is used, then the tool is lightweight and inexpensive, but the air compressor and air hose are inconvenient and the compressor is heavy and expensive
Solution Approach 1:
The patent combines the air compressor, motor, and driver into a single integrated tool unit. The compressor is positioned within the tool housing and directly coupled to the motor, eliminating the need for external compressors and air hoses, thereby improving convenience while maintaining lightweight design
Solution Approach 2:
The tool integrates multiple functions into one device: the motor provides rotational power, the scotch yoke mechanism converts rotation to linear motion for compression, the compressor generates pneumatic power, and the driver delivers the driving action. This multi-functional integration eliminates separate equipment needs
2Ease of operation
If a rotating flywheel is used to impart energy to the driver, then portability and convenience are increased, but the tool becomes complicated and expensive
Solution Approach 1:
The patent replaces the traditional flywheel-based mechanical energy storage system with an electric motor directly coupled to a scotch yoke mechanism. This substitution simplifies the mechanical complexity while maintaining the ability to deliver controlled driving energy, reducing both complexity and cost
Solution Approach 2:
The invention extracts and eliminates the flywheel component from the system, replacing it with a more straightforward electric motor-scotch yoke-compressor arrangement that achieves the same energy delivery function with fewer moving parts and less complexity
3Power
If an internal combustion engine is used to generate gaseous byproduct, then driving power is achieved, but expensive fuel canister and electricity source are required and maintenance is needed
Solution Approach 1:
The patent replaces the internal combustion engine with an electric motor-driven compression system. This substitution eliminates the need for fuel canisters, electricity sources, and complex combustion mechanisms, resulting in a system that requires minimal maintenance while providing sufficient driving power through pneumatic compression
Solution Approach 2:
The invention eliminates expensive consumables like fuel canisters by using an electric motor that can operate continuously without consumable replenishment. The electric motor provides sustained power without the need for periodic fuel refilling or combustion-related maintenance
4Productivity
If a traditional air compressor design is used, then the tool performs well for its function, but the maximum rotational torque required is high
Solution Approach 1:
The scotch yoke mechanism uses a curved roller slot geometry that converts rotational motion into linear piston motion with optimized force distribution. The curved path of the roller within the slot creates mechanical advantage that reduces the peak rotational torque required while maintaining effective compression performance
Solution Approach 2:
The scotch yoke mechanism dynamically converts constant-speed rotational motor output into variable-speed linear piston motion. The mechanism naturally varies the piston velocity and force application throughout the compression cycle, optimizing torque requirements by applying force most efficiently during each phase of compression
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 configuration enhances the tool's efficiency and reduces the maximum rotational torque required, improving portability and convenience while minimizing maintenance needs and costs.
Implementation Method 1
The scotch yoke mechanism is driven by the output member to reciprocate the first piston along a translation axis in the first cylinder. The scotch yoke mechanism includes a crank arm, which is coupled to the output member for rotation therewith, a crank arm roller, which is mounted on the crank arm, and a connecting rod with a roller slot into which the crank arm roller is received.
Implementation Method 2
The first linear motor forms an air compressor and includes a scotch yoke mechanism, a first cylinder and a first piston. The scotch yoke mechanism is driven by the output member to reciprocate the first piston along a translation axis in the first cylinder.
Implementation Method 3
The head assembly controls fluid communication between the first and second cylinders.
Implementation Method 4
The second linear motor has a second cylinder and a second piston that is slidably disposed in the second cylinder. The driver is received in the nosepiece and is coupled to the second piston for movement therewith.
Data Source
AI summary
A driving tool having first and second linear motors, a head assembly, a nosepiece and a driver. The first linear motor forms an air compressor and includes a scotch yoke mechanism for translating a first piston in a first cylinder. The scotch yoke mechanism includes a crank arm, a crank arm roller, which is coupled to the crank arm, and a connecting rod having a roller slot into which the crank arm roller is received. At least a portion of the roller slot is configured to vary an output rate at which the connecting rod translates along a translation axis relative to an input rate at which the crank arm roller moves in a direction that is parallel to the translation axis.