Power Unit Battery Layout for Compact Output Shaft Packaging

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Solution Overview

Problem

Existing power units for power tools are inefficient in terms of space utilization and operational functionality, leading to suboptimal user experience and performance.

Innovation Solution

A power unit design that integrates an output assembly, a housing, and a power supply device, featuring a symmetrical battery pack configuration and a control circuit for optimized space usage and enhanced operational capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the power unit integrates power supply device, output assembly, and control circuit into a compact design, then space utilization is improved, but operational functionality and user experience deteriorate

Engineering Contradiction:

Improvespace occupied by power unitVSAvoidoperational functionality

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

The power unit is divided into functionally independent modules: a detachable power supply device with battery packs, an output assembly with output shaft, and a control circuit. This segmentation allows each module to be optimized independently while maintaining overall compactness, resolving the contradiction between space utilization and operational functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs three-dimensional spatial arrangement of components, positioning the output shaft at a specific distance (≥5mm) from the bottom plane and arranging battery packs in symmetrical configurations. This dimensional optimization maximizes space utilization while preserving operational capabilities through strategic component placement.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If the output shaft is positioned closer to the bottom plane, then space utilization is improved, but operational performance deteriorates

Engineering Contradiction:

Improvespace occupied by power unitVSAvoidpower output efficiency

Core Design Contradiction:

Volume of moving objectVSProductivity

Solution Approach 1:

The patent specifies a critical parameter threshold: the distance between the output shaft and bottom plane must be greater than or equal to 5mm. This parameter optimization balances space utilization with operational performance, ensuring sufficient clearance for mechanical operation while maintaining compact overall dimensions.

Inventive Principle:

Principle #35Parameter changes

3Volume of moving object

If battery packs are arranged asymmetrically, then space utilization is improved, but operational balance and user experience deteriorate

Engineering Contradiction:

Improvespace occupied by power unitVSAvoiduser experience

Core Design Contradiction:

Volume of moving objectVSEase of operation

Solution Approach 1:

The patent employs symmetrical arrangement of battery packs relative to a central symmetry plane, with the output shaft positioned at a preset distance from this plane. This symmetrical configuration optimizes weight distribution and operational balance, enhancing user experience while maintaining efficient space utilization through structured symmetry rather than random asymmetry.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS20250038611A1Power unit

Publication Date: 2025.01.30 NANJING CHERVON IND

AI summary

A power unit includes an output assembly, a housing, and a power supply device. The output assembly includes an output shaft used for outputting power and rotatable about a first axis. The housing is used for supporting the output assembly. The power supply device powers the output assembly and includes at least a first battery pack.