Fan Element Sealing Integration for Hand Tool Drive Units
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Solution Overview
Problem
Existing hand-held power tool devices face challenges in achieving a compact and cost-effective sealing solution for their transmission units, particularly in the axial direction, while maintaining efficient heat dissipation and secure component integration.
Innovation Solution
The integration of a sealing ring made of felt, directly and firmly connected to the fan element, which is pressed onto the transmission element, providing a secure and space-saving seal without significantly increasing the device's length, and utilizing a planetary gear for speed adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate sealing component is used for the transmission unit, then sealing reliability is improved, but device complexity and assembly cost increase
Solution Approach 1:
The sealing element is integrated directly into the fan element by forming it as a separate component that is pressed onto the transmission element along with the fan element. This merging of sealing function into the cooling unit structure achieves reliable sealing while reducing device complexity and eliminating separate sealing components.
Solution Approach 2:
The fan element is designed to serve multiple functions: it provides cooling airflow through its fan blades, transmits rotational movement from the transmission element, and incorporates the sealing element to prevent lubricant leakage. This multi-functionality reduces the overall number of components while maintaining sealing reliability.
2Reliability
If a separate sealing component is used for the transmission unit, then sealing reliability is improved, but manufacturing and assembly costs increase
Solution Approach 1:
The sealing element is integrated directly into the fan element by forming it as a separate component that is pressed onto the transmission element along with the fan element. This merging of sealing function into the cooling unit structure achieves reliable sealing while reducing device complexity and eliminating separate sealing components.
Solution Approach 2:
The sealing element is pre-integrated into the fan element during manufacturing, so that when the fan element is assembled onto the transmission element, the sealing function is already in place. This preliminary integration reduces assembly steps and costs while ensuring proper sealing installation.
3Length of moving object
If the sealing element is integrated into the fan element, then device compactness is improved, but the receiving area space is reduced
Solution Approach 1:
The sealing element is positioned in the axial direction between the fan element and the transmission housing, utilizing the axial dimension rather than consuming additional radial or circumferential space. This dimensional arrangement maintains device compactness while providing adequate space for the sealing element's function.
Solution Approach 2:
The sealing element is nested within the structure formed by the fan element and transmission housing, fitting into the available axial space without requiring additional external volume. This nesting approach achieves compact integration while maintaining sufficient receiving area for sealing effectiveness.
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 allows for a compact, cost-effective, and reliable sealing solution that prevents fluid leakage while maintaining efficient heat dissipation and multifunctionality, reducing manufacturing and assembly costs.
Implementation Method 1
a fluid flow can be generated for heat dissipation within the hand-held power tool device, in particular the drive unit
Implementation Method 2
at least one sealing element which forms a seal of the transmission unit
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a hand tool machine device with a drive unit (10) comprising at least one drive shaft (12), with a gear unit (14) comprising at least one gear element (16), with a cooling unit (18) comprising at least one fan element (20) and with at least one sealing element (22) that is provided in particular for sealing the gear unit (14) in at least one axial direction (24). The invention proposes that the at least one fan element (20) has at least one receiving area (26) provided at least substantially for receiving the at least one sealing element (22).