Nested Drive Shaft in Rotary Impact Mechanism
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Solution Overview
Problem
Existing handwasher devices with drive units and rotary power plants often have complex designs that result in increased length and reduced compactness, making them less efficient and harder to handle.
Innovation Solution
The design incorporates an intermediate shaft that is essentially aligned with the drive shaft, with a radial warehouse that stores the drive shaft rotatably within the intermediate shaft, allowing for a compact structure with a low construction length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional drive unit configuration is used, then the device can perform basic power transmission, but the overall length and complexity of the device increases
Solution Approach 1:
The drive shaft is nested within the intermediate shaft, with the bearing supporting the drive shaft positioned inside the intermediate shaft structure. This nesting arrangement allows the drive unit to be compactly integrated into the rotary impact mechanism, significantly reducing the overall length of the device while maintaining functional complexity at acceptable levels
Solution Approach 2:
The drive unit and rotary impact mechanism are merged into a single integrated assembly where the drive shaft, intermediate shaft, and bearing work together as a unified power transmission system. This merging eliminates the need for separate housing structures and reduces the overall device length while maintaining operational complexity
2Length of moving object
If the drive shaft is supported by a bearing outside the intermediate shaft, then the bearing can be easily accessed, but the overall length of the device increases
Solution Approach 1:
The bearing is nested within the intermediate shaft structure, with the drive shaft rotating within the bearing which is itself positioned inside the intermediate shaft. This nested arrangement reduces the overall length of the device while the bearing remains accessible for installation and maintenance through the open end of the intermediate shaft
3Ease of operation
If a compact design is implemented, then the device becomes more handleable and storage-efficient, but the power transmission efficiency may be compromised
Solution Approach 1:
The nested arrangement of the drive shaft within the intermediate shaft, supported by the bearing inside the intermediate shaft structure, creates a compact design that improves handling ease and storage efficiency while maintaining effective power transmission through the aligned shafts and supported rotating components
Solution Approach 2:
The bearing is arranged in a plane that intersects the intermediate shaft at right angles, creating a perpendicular arrangement that allows compact packaging in one dimension while maintaining full rotational functionality in another dimension, thus achieving both compactness and power transmission efficiency
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 achieves a significantly compact and lightweight handwasher device, allowing for easier handling and storage, while maintaining efficient power transmission.
Implementation Method 1
The bearing can be designed as a plain bearing and/or a rolling bearing. Preferably, the bearing is at least partially designed as a rolling bearing, for example as a ball bearing, roller bearing or needle bearing.
Data Source
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AI summary
The invention relates to a hand-held power tool device with a drive unit (12a; 12b; 12c) comprising at least one drive shaft (14a; 14b; 14c), and with at least one rotary impact mechanism (16a; 16b; 16c) comprising at least one intermediate shaft (18a; 18b; 18c) aligned at least substantially with the drive shaft (14a; 14b; 14c), and with at least one bearing (20a; 20b; 20c) for supporting the drive shaft (14a; 14b; 14c). It is proposed that the bearing (20) be arranged at least partially in a plane (22a; 22b; 22c) intersecting the intermediate shaft (18a; 18b; 18c), which is at least substantially perpendicular to the intermediate shaft (18a; 18b; 18c).