Drill Tangential Impact Mechanism Speed Control
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Solution Overview
Problem
Existing hammer drills with additional tangential impact mechanisms operate at the same rotational speed as the spindle, limiting their operational performance and efficiency in both drilling and impacting tasks.
Innovation Solution
A drill with a tangential impact mechanism that can be activated at a different rotational speed than the spindle, allowing for adjustable torque thresholds to optimize drilling and impacting performance by varying the speeds of the spindle and tangential impact mechanism independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tangential impact mechanism is driven at the same rotational speed as the spindle, then the device structure is simplified, but the operational performance and efficiency of both drilling and impacting tasks are limited
Solution Approach 1:
The patent divides the drive system into two independent rotational speed control paths: one for the spindle and another for the tangential impact mechanism. This segmentation allows each component to operate at its optimal speed independently, resolving the contradiction between structural simplicity and operational performance by creating separate control systems for each functional element.
Solution Approach 2:
The invention implements dynamic speed control where the tangential impact mechanism can rotate at a different speed than the spindle based on operational requirements. This dynamic adjustment capability allows the system to optimize performance for different tasks (drilling vs. impacting) without being constrained by a fixed same-speed relationship, thereby improving productivity while maintaining manageable device complexity through controlled flexibility.
2Productivity
If the tangential impact mechanism operates at a different rotational speed than the spindle, then the drilling and impacting performance are optimized, but the device complexity increases
Solution Approach 1:
The patent creates a multi-functional drive system where a single drill device can perform both drilling and impacting operations with optimized performance for each function. By enabling independent rotational speed control of the tangential impact mechanism from the spindle, the system achieves universality in handling different operational requirements without requiring separate specialized devices, thus improving overall productivity while distributing the complexity across a versatile platform.
3Ease of operation
If the torque threshold for activating the tangential impact mechanism is fixed, then the control system is simple, but the adaptability to various applications is reduced
Solution Approach 1:
The invention introduces adjustable torque threshold parameters for activating the tangential impact mechanism. By allowing the torque threshold to be changed based on different application requirements, the system achieves adaptability to various drilling and impacting tasks while maintaining relatively simple control logic. This parameter adjustability resolves the contradiction by enabling the same control structure to handle diverse applications through configurable thresholds rather than complex control algorithms.
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 enhances the operational performance of the drill by enabling optimized speeds for both drilling and tangential impacts, improving efficiency and adaptability to various applications.
Implementation Method 1
a torque clutch having a first element which is rotationally fixed to the second shaft and a second element which is rotationally fixed to the ring gear, the torque clutch being arranged to transmit rotational movement between the drive spindle and the second shaft when a torque applied to the drive spindle is below a torque threshold and allow slippage between the first element and the second element when the torque applied to the drive spindle exceeds the torque threshold
Implementation Method 2
a spring arranged to urge the ball bearing against the inclined surface
Implementation Method 3
a path formed on an inner wall in the ring gear support, the path having an inclined surface relative to an axis of the drive spindle, a ball bearing arranged to locate in the square aperture and travel along the inclined surface when the torque applied to the drive spindle exceeds the torque threshold
Data Source
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AI summary
A drill comprising: a housing (2, 4); a motor (100) mounted in the housing (2, 4) having a drive spindle (16);an output spindle (60) capable of being rotationally driven by the drive spindle (16) via a torque clutch which slips when the torque across the torque clutch exceeds a predetermined value, the output spindle (60) having an impact surface (136) and a central axis (102); a tangential impact mechanism for superimposing tangential impacts onto the output spindle (60) when activated, the tangential impact mechanism comprising; a sleeve (74) rotatably mounted on the output spindle (60) which is capable of being rotationally driven by the drive spindle (16); and an anvil (116) rotatably mounted onto the output spindle (60) and which is connected to the sleeve (74) so that relative rotation of the sleeve (74) and spindle (60) results in the anvil (74) repetitively striking the at least one impact surface (136); wherein the output spindle (60) and the sleeve (74) are rotationally driven by the drive spindle (16) via a gear system (70, 78, 94); wherein the drive spindle (16) drives the sleeve (74) via the gear system at a at the same rate and direction as the output spindle (60) so that there is no relative rotation between the sleeve and output spindle (6) when the torque clutch is not slipping and at a different rate and/or direction so that there is relative rotation between the sleeve and output spindle (60) when the torque clutch is slipping; characterised in that predetermined value of the torque at which the torque clutch starts to slip is capable of being adjusted.