Dual-Motor Rotary Hammer for Independent Speed and Impact Control
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Solution Overview
Problem
Existing rotary hammers lack the ability to independently control the rotational speed of the spindle and the reciprocation frequency of the piston, limiting the optimization of tool bit performance for different drilling operations.
Innovation Solution
A rotary hammer tool equipped with two motors, one for spindle rotation and one for piston reciprocation, allows independent control of rotational speed and reciprocation frequency through a mode selection switch and actuation member, enabling adjustment of the blow pattern of the tool bit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor is used to drive both spindle rotation and piston reciprocation, then the device complexity is reduced, but the ability to independently control rotational speed and reciprocation frequency is lost
Solution Approach 1:
The single motor system is segmented into two independent motors: a first motor dedicated to driving spindle rotation and a second motor dedicated to driving piston reciprocation. This segmentation allows independent control of rotational speed and reciprocation frequency, resolving the contradiction by sacrificing some structural simplicity to gain operational versatility and independent control capability.
2Ease of operation
If rotational speed and reciprocation frequency are coupled, then the control mechanism is simpler, but the optimization of tool bit performance for different drilling operations is limited
Solution Approach 1:
The control system is made dynamic by introducing independent control mechanisms for rotational speed and reciprocation frequency. The first motor controls spindle rotation speed while the second motor controls piston reciprocation frequency, allowing the system to adapt to different drilling operations and optimize tool bit performance through dynamic adjustment of both parameters independently.
3Adaptability or versatility
If two motors are used for independent control, then the adaptability and independent control capability are improved, but the device complexity increases
Solution Approach 1:
Each motor is designed with a dedicated single function: the first motor universally handles spindle rotation while the second motor universally handles piston reciprocation. This multi-functionality approach, where each component has a specialized role, reduces the overall system complexity compared to a single motor attempting to perform both functions, while maintaining independent control capability and adaptability.
Data Source
AI summary
A rotary hammer tool can include a housing, a first motor supported by the housing, a spindle rotated by the first motor, a second motor supported by the housing, and a reciprocation mechanism reciprocated by the second motor. The reciprocation mechanism can include a piston driven to reciprocate within the spindle and a striker to reciprocate within the spindle in response to reciprocation of the piston. The rotational speed of the spindle and a reciprocation frequency of the reciprocation mechanism may be independently controllable.