Motor Support Assembly for Compact, Rigid Hammer Drills
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Solution Overview
Problem
Existing hand-held power tools, such as hammer drills, face challenges in achieving sufficient rigidity and robustness, while also requiring reduced installation space.
Innovation Solution
The hand-held power tool incorporates a drive unit with a motor support connected to housing half-shells via non-positive and positive-locking connections. These connections enhance the tool's rigidity and robustness while minimizing installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the motor support is connected to housing half-shells via screw connection, then the connection is secure, but the installation space increases and rigidity is insufficient
Solution Approach 1:
The patent combines multiple connection functions into a single integrated motor support structure. The motor support simultaneously provides bearing support, positioning, and connection to the housing half-shells through integrated features (bearing bores, positioning protrusions, and connection elements), eliminating the need for separate mounting components and reducing installation space while maintaining connection strength.
Solution Approach 2:
The motor support extends in multiple spatial dimensions to achieve compact integration. By designing the motor support with extended portions that engage with housing half-shells at different locations and orientations, the connection is achieved in three-dimensional space without requiring additional installation volume, effectively utilizing spatial arrangement to resolve the contradiction between connection strength and installation space.
2Ease of manufacture
If traditional connection methods are used between motor support and housing, then assembly is simple, but rigidity and robustness are insufficient
Solution Approach 1:
The motor support is segmented into multiple functional portions: a main body for motor mounting, extended portions for connection to housing half-shells, integrated bearing bores, and positioning protrusions. This segmentation allows each feature to perform its specific function while maintaining overall structural rigidity, and the modular design facilitates straightforward assembly without compromising stability.
3Manufacturing precision
If the motor support is designed as a single integrated component, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The motor support is designed as a universal component that performs multiple functions simultaneously: supporting the drive motor, providing bearing mounting locations, positioning relative to housing half-shells, and connecting to the housing structure. By consolidating these functions into a single component, the patent improves manufacturing precision (particularly concentricity of bearing points) while the modular functional integration actually reduces overall device complexity compared to multiple separate parts.
Data Source
AI summary
A hand-held power tool, in particular a hammer drill, includes a tool holder and a housing which has two housing half-shells. The hand-held power tool further includes a drive unit for driving a tool holder arranged in the housing. The drive unit includes at least one drive motor arranged in a motor support and a gear unit arranged in a gear unit housing. The motor support is connected directly to at least one of the two housing half-shells via at least one non-positive connection and at least one positive-locking connection. A relevant fastening axis is assigned to the at least one non-positive connection and to the at least one positive-locking connection. The fastening axis is arranged at right angles to and at a distance from an axis of rotation assigned to the tool holder.