Multi-Orbit Balancing Structure for Low-Vibration Machine Tools
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Solution Overview
Problem
Existing machine tools, particularly hand-held and semi-stationary tools, suffer from complex and costly designs due to their balancing mechanisms, which often involve multiple components that are difficult to manufacture and assemble.
Innovation Solution
A compact design with multiple orbits on a single guide body, where balancing weights are movably mounted within these orbits, allowing for precise machining without transitioning between orbits, and utilizing different radial distances for coarse and fine tuning, with integrated damping fluids and materials for optimal balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple orbits are arranged on a single guide body with different radial distances, then balancing precision is improved through coarse and fine tuning, but device complexity increases due to multiple orbits and balancing bodies
Solution Approach 1:
The balancing device is segmented into multiple independent orbits (first orbit with larger radial distance for coarse tuning, second orbit with smaller radial distance for fine tuning) on a single guide body. Each orbit contains balancing bodies that can be independently adjusted, allowing separate coarse and fine balancing operations without interfering with each other.
Solution Approach 2:
Multiple orbits are arranged at different radial distances from the axis of rotation, creating a dimensional hierarchy. The first orbit operates at a larger radial distance for coarse balancing, while the second orbit operates at a smaller radial distance for fine balancing, effectively using radial dimension to differentiate balancing functions.
2Stability of the object's composition
If balancing weights are constrained to remain within their respective orbits, then balancing stability is improved, but adjustment flexibility is reduced
Solution Approach 1:
The balancing bodies are designed to be movably mounted within their respective orbits rather than fixed. This allows dynamic adjustment of balancing weights along the orbital paths during operation, enabling adaptation to different balancing requirements while maintaining confinement within designated orbits through guide structures.
Solution Approach 2:
Guide structures act as intermediaries between the balancing bodies and the orbits. These guides constrain the balancing bodies to remain within their respective orbits while still allowing movement along the orbital paths, thus mediating between the requirements for stability (confinement) and flexibility (movement).
3Manufacturing precision
If the guide body is machined with high precision to form multiple orbits, then orbital accuracy is improved, but manufacturing cost and time increase
Solution Approach 1:
Multiple orbits are integrated into a single guide body that is machined as one piece. The first orbit and second orbit are both formed on the same base body through machining operations, allowing simultaneous creation of multiple precision orbital paths in a single manufacturing process rather than assembling separate components.
Solution Approach 2:
The guide body serves multiple functions: it provides the structural foundation for the balancing device, contains multiple precisely machined orbits for different balancing functions, and acts as the mounting platform for all balancing bodies. This multi-functionality reduces the need for separate components and assembly steps.
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 high precision and efficient balancing, reducing manufacturing complexity and costs while effectively minimizing vibrations, enhancing user comfort and tool performance.
Implementation Method 1
The at least one balancing body in the orbit with a larger radial distance to the axis of rotation advantageously serves for coarse tuning or coarse trimming of the balancing device, while the at least one balancing body in the orbit with a smaller radial distance to the axis of rotation expediently performs the fine tuning or fine trimming
Implementation Method 2
utilizing different damping fluids and materials to achieve optimal balancing without moving between orbits
Data Source
Figure 1~2
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Figure 5~6
AI summary
The invention relates to a machine tool (10), specifically a hand-held machine tool or semi-stationary machine tool, having a drivetrain (108), which comprises: a tool shaft (23) mounted rotatably on a drive carrier (80) by means of a bearing assembly (27); and a tool receptacle (35), arranged on the tool shaft (23), for an in particular plate-like working tool (40). The tool shaft (23) is rotatably driveable about a rotational axis by a drive motor of the machine tool, and a balancing device (50) is arranged on the tool shaft (23) which comprises a guide body (51) having at least one orbital path (52) extending around the rotational axis and at least one balancing body (54, 55) movably mounted in the orbital path (52). In this machine tool, according to the invention, the at least one orbital path (52) arranged on the guide body (51) comprises a first orbital path (52), which is at a first radial distance from the rotational axis, and at least a second orbital path (53), which is longitudinally spaced apart from the first orbital path (52) with respect to the rotational axis and is at a second radial distance from the rotational axis, which second distance is greater than the first radial distance, and is separate from the first orbital path (52) such that the balancing bodies (54, 55) arranged in each orbital path (52, 53) are held between the orbital paths (52, 53) so as to be non-adjustable and/or in a cage-like manner in the relevant orbital path (52, 53) thereof.