Electric Drill Gearbox Airflow Passage for High-Speed Cooling

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Solution Overview

Problem

Existing electric drills face challenges in effectively dissipating heat from the gearbox during high-speed operations, which can lead to gearbox failure and render the drill unusable.

Innovation Solution

The electric drill design incorporates a gearbox with a passage in the rear cover for airflow, along with vents and a diverter rib to guide airflow, ensuring comprehensive heat dissipation for both the motor and gearbox during high-speed operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the motor speed is increased to meet performance requirements, then the rotational speed performance is improved, but the heat generated by the gearbox increases leading to potential failure

Engineering Contradiction:

Improvemotor rotational speedVSAvoidgearbox temperature

Core Design Contradiction:

SpeedVSTemperature

Solution Approach 1:

The patent segments the heat dissipation system into two independent pathways: one for the motor (using the fan and air inlet/outlet) and another for the gearbox (using the passage in the gearbox rear cover). This allows each component to be cooled independently, enabling the motor to operate at high speeds without causing gearbox overheating.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The passage in the gearbox rear cover acts as an intermediary heat dissipation channel. It introduces a dedicated airflow path that mediates between the external environment and the gearbox interior, allowing heat to be carried away from the gearbox without interfering with the motor's cooling system.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If the motor speed is increased to meet performance requirements, then the rotational speed performance is improved, but the gearbox may fail due to overheating

Engineering Contradiction:

Improvemotor rotational speedVSAvoidgearbox reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The passage is designed in advance to prevent overheating before it occurs. By providing a pre-established heat dissipation pathway, the system cushions against the potential harm of gearbox failure that would otherwise result from high-speed operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Volume of moving object

If the structure is miniaturized to reduce size, then the device compactness is improved, but the heat dissipation capability is reduced

Engineering Contradiction:

Improveelectric drill sizeVSAvoidheat dissipation capability

Core Design Contradiction:

Volume of moving objectVSTemperature

Solution Approach 1:

The patent utilizes the thickness dimension of the gearbox rear cover to create the heat dissipation passage. By forming the passage through the cover thickness rather than requiring additional lateral space, the design achieves effective heat dissipation without increasing the overall volume of the electric drill.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The passage structure merges multiple functions into a single component: it serves as both a structural element of the gearbox assembly and a heat dissipation channel. This integration allows heat dissipation functionality to be added without increasing device complexity or volume.

Inventive Principle:

Principle #5Merging (Combining)

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 design achieves effective and comprehensive heat dissipation, preventing gearbox failure and ensuring the electric drill operates efficiently and reliably even at high speeds.

Implementation Method 1

a passage provided in the gearbox rear cover; and at least a part of a flow path of an airflow that enters the housing from the air inlet and flows out of the housing from the air outlet is provided on the passage

Methodology Applied

Scientific EffectAirflow: Convection

Implementation Method 2

a diverter rib configured to guide the airflow is provided within the passage

Methodology Applied

Scientific EffectFlow guidance: Convection

Implementation Method 3

a fan supported by the motor shaft; at least a part of a flow path of an airflow that enters the housing from the air inlet and flows out of the housing from the air outlet is provided on the passage

Methodology Applied

Scientific EffectForced convection: Forced Convection

Data Source

PatentEP4122647B1Electric drill and electric tool

Publication Date: 2025.04.23 NANJING CHERVON IND

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AI summary

An electric drill, including: a housing provided with an air inlet and an air outlet; a motor received in the housing, wherein the motor at least includes a motor shaft; a fan supported by the motor shaft; a transmission assembly configured to connect the motor shaft to an output shaft; and a gearbox configured to accommodate the transmission assembly; wherein the gearbox is formed with a passage, and at least a part of a flow path of an airflow that enters the housing from the air inlet and flows out of the housing from the air outlet is provided on the passage. By adopting the above solution, an electric drill and an electric tool with good heat dissipation effect and compact size can be provided.