Rotary Hammer Beater Enclosing Tool Spindle
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Solution Overview
Problem
Existing hand-held power tools, such as rotary hammer drills, face challenges in achieving a balance between compactness, low mass, and high performance, while also providing efficient impact and rotary movements to the tool spindle, which affects drilling efficiency and user comfort.
Innovation Solution
The design incorporates a gear arrangement with a planetary gear stage, a hammer mechanism with a beater that encloses the tool spindle, and a spring-elastic lever element to achieve high impact energy and low-vibration operation, along with a detachable coupling device and torque setting unit to optimize performance and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional hammer mechanism design is used, then impact energy can be achieved, but the tool spindle mass becomes high and the tool becomes less compact
Solution Approach 1:
The beater is designed to enclose the tool spindle within its structure, with the tool spindle passing through the beater along its axis of rotation. This nested arrangement allows the tool spindle to be integrated within the hammer mechanism rather than being a separate external component, reducing overall mass and achieving a more compact design while maintaining impact energy transmission
2Volume of moving object
If the beater encloses the tool spindle completely, then compactness is improved, but the complexity of the hammer mechanism increases
Solution Approach 1:
The tool spindle serves multiple functions simultaneously: it acts as the rotational drive shaft for the tool, serves as the impact transmission element struck by the beater, and functions as a structural support component within the enclosed beater. This multi-functionality reduces the need for separate components, simplifying the overall mechanism while achieving complete enclosure
3Volume of moving object
If the tool spindle is integrated within the beater, then the tool becomes more compact, but manufacturing complexity increases
Solution Approach 1:
The tool spindle is divided into distinct functional sections: a first section that passes through the beater and is struck by the beater during impact operations, and a second section that extends beyond the beater to connect with the tool fastening device. This segmentation allows each section to be optimized and manufactured separately using standard machining processes, then assembled together, reducing overall manufacturing complexity despite the integrated design
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 lightweight, compact, and high-performance hand-held power tool that provides effective percussion drilling with reduced wear and tear, allowing for efficient drilling progress and comfortable operation.
Implementation Method 1
The hand-held power tool has a spring-elastic lever element, which is pivotably mounted about a pivot axis and is intended to drive the hammer of the hammer mechanism
Implementation Method 2
the striker strikes the tool spindle in at least one operating state. The striker advantageously transmits an impact impulse to at least part of the tool spindle
Data Source
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AI summary
The invention relates to a hand-held power tool, in particular a rotary hammer, comprising a gear assembly (14a; 14b), a hammer mechanism (16a; 16b), and a tool spindle (18a; 18b), wherein the hammer mechanism (16a; 16b) has a striker (68a; 68b) that at least partially encloses the tool spindle (18a; 18b) in at least one plane. It is proposed that the hammer mechanism (16a; 16b) has a releasable coupling device (148a; 148b) designed to transmit a rotary motion.