Percussion Mechanism Eccentric Gear Integration
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Solution Overview
Problem
Existing hand-held power tools with mechanical percussion mechanisms face challenges in achieving a compact and efficient design for the eccentric, gear, and motor arrangement, leading to increased complexity and manufacturing time.
Innovation Solution
A reduction-gear mechanism with a first and second spur gear, where the second spur gear has teeth positioned perpendicularly to the percussion axis, integrated with a bearing element, allows for a compact and straightforward assembly of the eccentric and motor components, reducing manufacturing time and enhancing symmetry and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional arrangement of eccentric, gear, and motor is used in hand-held power tools, then the components can be separately manufactured and assembled, but the overall design becomes complex and manufacturing time increases
Solution Approach 1:
The patent combines the eccentric and the second spur gear into a single integrally formed component. This merging eliminates the need for separate manufacturing and assembly of these two parts, reducing manufacturing time and simplifying the overall component arrangement while maintaining the necessary mechanical functions of both the eccentric motion and gear transmission.
2Ease of operation
If the eccentric and motor are arranged asymmetrically, then component placement is flexible, but the power tool becomes unbalanced and harder to manage
Solution Approach 1:
The patent employs asymmetric arrangement of the motor relative to the percussion axis, positioned at a distance that creates a specific balance configuration. This asymmetric positioning, combined with the integral eccentric-gear component, achieves optimal center of gravity distribution and balance, making the power tool easier to handle and operate while maintaining compact dimensions.
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
The solution enables a simple, compact, and balanced hand-held power tool design with improved manageability and efficient energy transfer, facilitating user-friendly operation and vibration reduction.
Implementation Method 1
a drive motor for driving a mechanical percussion mechanism is arranged
Implementation Method 2
the percussion mechanism is assigned an eccentric for driving the connecting rod in rotation
Implementation Method 3
a reduction-gear mechanism, which can be driven by the drive motor and has a first spur gear, is arranged along the percussion axis
Implementation Method 4
a percussion piston which can be driven in a linear oscillating manner, such that it can be displaced along an associated percussion axis
Data Source
AI summary
A hand-held power tool having a housing in which a drive motor for driving a percussion mechanism is arranged. The percussion mechanism has a percussion piston arranged in a hammer tube for displacement along an associated percussion axis, via a connecting rod. The percussion mechanism is assigned an eccentric for driving the connecting rod in rotation. A reduction-gear mechanism driven by the drive motor has a first spur gear arranged along the percussion axis between the drive motor and the eccentric. The eccentric is arranged on a second spur gear. The first spur gear meshes with teeth of the second spur gear. At least some of the teeth of the second spur gear are positioned perpendicularly to the percussion axis, between the percussion axis and a plane arranged parallel to the percussion axis. A bearing element of the eccentric arranged towards the percussion axis is arranged in the plane.