Compact Electric Ratchet Wrench with Nested Motor and Gear Assembly
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Solution Overview
Problem
Conventional electric ratchet wrenches are bulky and difficult to operate in limited spaces due to their large volume and length, primarily because of the sequential arrangement of components like the motor, deceleration gear set, and support tube, which increases their overall size and makes them cumbersome.
Innovation Solution
The design includes a tool head unit, an output unit, a wrench body unit, an electric unit, and a control unit, where the electric motor is mounted in a middle space, and the transmission subunit is in a front space, with a battery module in a rear space, allowing for a compact configuration with a detachable wrench body unit and a sleeve member that enhances structural strength and grip length, while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a motor with relatively large output power is equipped on the conventional electric ratchet wrench, then the output power is improved, but the device occupies a relatively large room and increases overall volume
Solution Approach 1:
The patent applies nesting by placing the deceleration gear set inside the support tube, and the front cover inside the support tube, creating a nested configuration where components are housed within one another. This reduces the overall volume while maintaining the motor's power output capability.
Solution Approach 2:
The patent changes the spatial arrangement from a sequential linear layout to a three-dimensional configuration where the deceleration gear set is positioned radially within the support tube rather than extending linearly. This dimensional reorganization reduces the lengthwise dimension while preserving functional volume.
2Strength
If the front cover, deceleration gear set, and support tube are sequentially sleeved on one another, then the structural strength is improved, but the length and sectional size in the lengthwise direction are increased
Solution Approach 1:
The deceleration gear set is nested within the support tube, and the front cover is nested within the support tube, creating a compact configuration where components occupy radial space rather than extending axially. This maintains structural strength through proper support while reducing the lengthwise dimension.
Solution Approach 2:
The crown portion is designed to be movable between the tool head portion and main body, allowing dynamic adjustment of the assembly. This enables the structure to adapt its configuration, maintaining strength where needed while minimizing length during operation.
3Ease of manufacture
If the conventional electric ratchet wrench has a large overall volume, then the motor and components can be properly housed, but it becomes difficult to operate in a limited space
Solution Approach 1:
By nesting the deceleration gear set and front cover within the support tube, the patent achieves a compact overall volume that can still properly house all necessary components. This nested configuration reduces the wrench's footprint, making it easier to operate in limited spaces while maintaining manufacturing feasibility.
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 results in a more compact and lightweight electric ratchet wrench that is easier to use in confined spaces, with improved structural strength and convenience, as well as the ability to illuminate work areas with integrated light emitting elements.
Implementation Method 1
an electric motor that is mounted in the middle space, and that is operable for converting electrical energy to kinetic energy
Implementation Method 2
a battery module that is disposed in the rear space, that is electrically connected to the control module, and that is configured to provide the electrical energy
Data Source
AI summary
An electric ratchet wrench includes a tool head unit, a wrench body unit, an output unit, an electric unit, and a control unit. The wrench body unit defines a front space, a middle space and a rear space, has a maximum gripping length, and includes a sleeve member having a maximum width. A ratio between the maximum gripping length and the maximum width ranges from 3 to 9. The electric unit includes an electric motor connected to a rear ring section of the wrench body unit and converting electrical energy to kinetic energy, and a transmission subunit connected to a front ring section of the wrench body unit, and transmitting the kinetic energy to a head driver of the output unit. The control unit includes a control module signally connected to the electric motor, and a battery module electrically connected to the control module, and providing the electrical energy.