Drill Tangential Impact Mechanism Speed Control
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Solution Overview
Problem
Existing hammer drills lack optimal operational performance in both drilling and tangential impacting modes due to the same rotational speed being applied to both mechanisms, which can lead to inefficiencies during drilling and impacting tasks.
Innovation Solution
A drill with a tangential impact mechanism that is activated at a different rotational speed than the spindle, allowing for optimized performance by varying the speeds of drilling and tangential impacting operations based on torque levels, utilizing a planetary gear system and a torque clutch to manage these speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same rotational speed is applied to both the spindle and the tangential impact mechanism, then the device structure is simple, but the drilling and impacting performance cannot be optimized simultaneously
Solution Approach 1:
The patent applies dynamics by making the tangential impact mechanism's rotational speed independent of the spindle speed. The impact mechanism is driven by a separate clutch system that can engage at different speeds based on operating conditions, allowing each component to operate at its optimal speed rather than being constrained to a fixed relationship.
Solution Approach 2:
The patent changes the parameter of rotational speed independence between the spindle and tangential impact mechanism. By introducing a clutch system that can disengage the impact mechanism or engage it at different speeds, the system allows parameter variation in the impact mechanism's speed while maintaining spindle speed consistency, optimizing performance across different operating modes.
2Productivity
If the tangential impact mechanism operates at a different rotational speed than the spindle, then the operational performance is optimized, but the control system becomes more complex
Solution Approach 1:
The patent segments the drive system into independent components: a spindle drive system and a separate tangential impact mechanism drive system. The impact mechanism is coupled to the spindle through a clutch system that can engage or disengage independently, allowing the two mechanisms to operate at different speeds without requiring a completely separate motor, thus managing complexity through functional segmentation.
Solution Approach 2:
The clutch system acts as an intermediary between the spindle and the tangential impact mechanism. It mediates the power transmission by allowing variable engagement states, enabling the impact mechanism to be activated at appropriate speeds based on operational needs while maintaining a relatively simple overall structure compared to having separate drive systems.
3Reliability
If the tangential impact mechanism is activated only at high torque conditions, then the mechanism is protected from damage, but the response time to impact conditions increases
Solution Approach 1:
The clutch system incorporates feedback from torque sensors or switchable engagement mechanisms that detect when high torque conditions occur. When the torque exceeds a predetermined threshold, the clutch engages to activate the tangential impact mechanism, providing timely response while ensuring the mechanism is only activated when necessary to protect against damage.
Data Source
AI summary
A drill includes a housing and a motor having a drive spindle. An output spindle is capable of being rotationally driven by the drive spindle via a torque clutch. The drill further includes atangential impact mechanism for superimposing tangential impacts onto the output spindle when activated. The tangential impact mechanism includes a sleeve rotatably mounted on the output spindle, and an anvil rotatably mounted onto the output spindle. The output spindle and the sleeve are rotationally driven by a planetary gear system comprising a ring gear, a sun gear and a planetary gear which is drivingly connected between the ring gear and sun gear.