Internal Rotor Nail Drive Device for Electric Nail Gun

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional electric nail guns have complex structures due to the inability of motors to directly control the reciprocating motion of nailing rods based on the nailing stroke, requiring conversion mechanisms that complicate the design.

Innovation Solution

An internal rotor type nail drive device with a rotary actuator that uses electro-magnetic mutual action components to generate a specific rotation angle, directly driving the nailing rod for a preset stroke, simplifying the structure and enhancing power output efficiency within limited space and power supply.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a motor and elastic component are used to drive the nailing rod with rotational kinetic energy conversion, then the nailing rod can achieve reciprocating motion, but the structure becomes too complicated

Engineering Contradiction:

Improvenailing rod reciprocating motion controlVSAvoidstructure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent extracts the elastic component from the driving mechanism, using only a motor to directly drive the nailing rod through a drive shaft. The motor's rotational motion is directly converted to linear reciprocating motion of the nailing rod, eliminating the need for separate elastic components while maintaining the nailing function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the traditional mechanical energy conversion system (motor → flywheel → sliding base → nailing rod) with a direct mechanical drive system (motor → drive shaft → nailing rod). This substitution simplifies the mechanical transmission path and reduces structural complexity while achieving the same nailing effect.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If an external rotor type rotary actuator is used to simplify the structure, then the structure is simplified, but the power output efficiency is reduced due to space limitations

Engineering Contradiction:

Improvestructure simplificationVSAvoidpower output efficiency

Core Design Contradiction:

Device complexityVSPower

Solution Approach 1:

The patent inverts the traditional external rotor configuration by using an internal rotor design where the rotor is positioned inside the stator. This inversion allows the rotor to have a smaller radius, concentrating mass closer to the rotation axis, which reduces rotational inertia and increases angular acceleration, thereby improving power output efficiency while maintaining structural simplification.

Inventive Principle:

Principle #13The other way round (Inversion)

3Power

If the rotor radius is increased to enhance power output, then more space is required, but the configuration space inside the gun body is limited

Engineering Contradiction:

Improvepower output efficiencyVSAvoidrotor volume

Core Design Contradiction:

PowerVSVolume of moving object

Solution Approach 1:

The patent implements nesting by placing the rotor inside the stator, creating a compact internal rotor configuration. The rotor rotates within the stationary stator, allowing both components to occupy the same spatial envelope. This nesting arrangement maximizes power output efficiency by optimizing the rotor's mass distribution while minimizing the overall volume occupied by the actuator, fitting within the limited gun body space.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

Simplifies the electric nail gun structure, allows direct control of nailing rod motion, and increases nailing power output efficiency by concentrating mass and reducing rotational inertia, enabling precise and effective nailing and resetting motions.

Implementation Method 1

a wire bundle that can generate effective magnetic fields of the same current direction, and a magnetic plate that can generate lines of magnetic force to induce mutual action with the wire bundle

Methodology Applied

Scientific EffectElectromagnetic interaction: Lorentz Force

Implementation Method 2

The sliding base configured on the nailing rod and the flywheel are arranged to contact each other. At the moment of contact, the rotational kinetic energy accumulated by the flywheel will immediately be transmitted to the sliding base

Methodology Applied

Scientific EffectRotational kinetic energy: Flywheel

Data Source

PatentUS12186932B2Internal rotor type nail drive device of electric nail gun

Publication Date: 2025.01.07 DE POAN PNEUMATIC CORP

AI summary

An internal rotor type nail drive device of electric nail gun, comprising a nailing rod and an internal rotor type rotary actuator that can output a specific rotation angle and can drive the nailing rod to move downward for nailing. Specifically, the rotary actuator comprises a stator and a rotor arranged inside the stator, even groups of electromagnetic mutual action components are configured in pairs between the stator and the rotor, to generate a tangential force to drive the rotor to rotate for a specific rotation angle, and to drive the nailing rod to move for a nailing stroke. The nailing stroke can be determined by a specific rotation angle. Thus, through the above configuration of the rotary actuator, the structure of the electric nail gun can be simplified, and the kinetic energy for nailing can be increased.