Spindle Lock Element Axial Offset for Power Tool Drive
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Solution Overview
Problem
Hand-held power tool devices face challenges in achieving a compact, reliable, and cost-effective design that allows for flexible application and stable operation while ensuring efficient drive motion transmission and locking mechanisms.
Innovation Solution
The design incorporates a spindle lock element with a clamping surface offset from the entrainment element in the axial direction, allowing for force-locked and form-locked locking, and is coupled to the spindle unit in a form-locking manner, with a groove and tongue unit for robust transmission, and play between components for alignment and tolerance compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clamping surface and entrainment element are integrated in the same axial position, then the structure is simpler, but the reliability of locking and drive motion transmission is reduced
Solution Approach 1:
The spindle lock element is segmented into functionally distinct components: the clamping surface (for locking) and the entrainment element (for drive motion transmission). These are positioned at different axial locations, allowing each to perform its specific function independently and reliably without compromising the other.
Solution Approach 2:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional axial arrangement by positioning the clamping surface and entrainment element at different axial positions. This spatial separation along the axial dimension enables both functions to coexist without interference while maintaining structural integrity.
2Reliability
If multiple separate components are used for locking and drive motion transmission, then the reliability is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The clamping surface and entrainment element are merged into a single spindle lock element that performs both locking and drive motion transmission functions. This integration reduces the total component count and manufacturing complexity while maintaining the functional separation and reliability benefits of having distinct functional zones.
Solution Approach 2:
The spindle lock element is designed as a multi-functional component that simultaneously provides locking capability (via the clamping surface) and drive motion transmission capability (via the entrainment element). This universal design reduces the number of separate parts needed while ensuring reliable performance of both functions.
3Productivity
If the spindle lock element is tightly coupled to the spindle unit, then the drive motion transmission is more efficient, but the alignment tolerance and assembly flexibility are reduced
Solution Approach 1:
The coupling between the spindle lock element and spindle unit is designed to be dynamically adaptive, allowing for alignment adjustments during assembly while maintaining efficient drive motion transmission during operation. The design accommodates tolerance variations through controlled play that self-aligns under operational loads.
Solution Approach 2:
The coupling parameters (clearance, interference fit, etc.) are optimized to balance transmission efficiency and alignment flexibility. The design allows parameter variations within specified ranges to accommodate manufacturing tolerances while ensuring reliable drive motion transmission across the full range of expected operating conditions.
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 compact, reliable, and cost-effective hand-held power tool with flexible applicability, stable operation, and efficient drive motion transmission, enabling easy replacement of spindle lock elements and minimizing manufacturing variance.
Implementation Method 1
The at least one clamping surface of the spindle lock element is at least partially provided for transmitting the drive motion of the drive unit to the spindle lock element in an operating state
Implementation Method 2
coupled to the spindle unit in a form-locking manner, with a groove and tongue unit for robust transmission
Data Source
AI summary
A hand-held power tool device includes at least one spindle unit, which is provided in particular for transmitting a drive motion of a drive unit to a tool receptacle, and a locking unit, which is provided in particular for locking the at least one spindle unit in at least one locking state, and which has at least one spindle lock element, which includes at least one entrainment element, and which is provided for at least partially transmitting the drive motion of the drive unit to the at least one spindle unit in at least one operating state. The spindle lock element has at least one clamping surface, which is situated at least partially offset from the at least one entrainment element at least in an axial direction.