Hammer Drill Drive Shaft Dampener Torque Smoothing
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Solution Overview
Problem
The peak driving torque variations during a hammer cycle in hammer drills cause increased wear on component parts, leading to higher stress and potential size constraints due to the varying torque loads.
Innovation Solution
Incorporating a dampener within the drive shaft of the hammer drive mechanism, made from resiliently deformable materials or mechanical springs, to absorb and release energy, thereby smoothing out the torque variations throughout the hammer cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hammer drive mechanism without a dampener is used, then the structure is simpler and manufacturing is easier, but the peak driving torque variations cause increased wear on component parts and potential size constraints
Solution Approach 1:
A dampener is introduced as an intermediary component between the drive shaft and the crank mechanism. This dampener absorbs peak driving torque variations and smooths out torque fluctuations, thereby reducing wear on component parts while maintaining the overall hammer drive mechanism structure
Solution Approach 2:
The dampener changes the torque parameter characteristics by absorbing peak torque variations and releasing energy during lower torque periods. This parameter transformation smooths the torque curve and reduces the amplitude of torque fluctuations transmitted to the crank and connecting rod
2Reliability
If component parts are sized to withstand peak torque loads, then reliability is improved, but the device size and weight increase
Solution Approach 1:
The dampener acts as a buffer that decouples the peak torque loads from the crank and connecting rod. By absorbing torque variations, it allows these components to be sized for average torque rather than peak torque, reducing their mass and dimensions
Solution Approach 2:
The dampener provides beforehand cushioning by absorbing excess energy during peak torque phases before it can be transmitted to the crank mechanism. This pre-cushioning effect protects the components from high-stress conditions that would otherwise require oversized design
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 reduces wear on component parts by minimizing torque variations, allowing for smaller component sizes and improved durability.
Implementation Method 1
Incorporating a dampener within the drive shaft of the hammer drive mechanism, made from resiliently deformable materials or mechanical springs, to absorb and release energy, thereby smoothing out the torque variations throughout the hammer cycle
Data Source
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AI summary
A hammer drive mechanism for a hammer strike mechanism of a hammer drill comprising: a drive shaft (29) capable of being rotationally driven by a motor; a rod (23, 306) capable of reciprocatingly driving a piston; a conversion mechanism (25, 27; 302) which converts the rotary movement of the drive shaft (29) into a reciprocating movement of the rod (23;306); characterised in that the drive shaft comprises a first part (120; 308) connected to the conversion mechanism (25, 27; 302) and a second part (122; 310), the second part (122; 310) capable of being rotationally driven by a motor;wherein the second part (122, 310) connects to the first part (210 via at least one dampener (140) wherein the rotary movement of the second part (122; 310) is transferred to the first part (120; 310) via the at least one dampener (140).