Radial Elastic Element for Percussion Device Recoil Damping
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Solution Overview
Problem
Percussion devices, such as handheld drilling machines, face challenges in managing recoil forces, leading to high vibration and noise levels, which can strain operators and disrupt environments, due to the limitations of existing recoil dampening systems.
Innovation Solution
A percussion device design featuring a radially outward elastic element directly integrated within the machine housing, allowing for direct contact with the housing's inner surface and the piston, which expands to absorb recoil forces and includes a spring-loaded transmission element and stop plate for efficient recoil management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional recoil damper with multiple components (elastic ring, stop ring, locking element) is used, then the recoil can be dampened, but the device complexity increases and assembly becomes more difficult
Solution Approach 1:
The patent merges the elastic ring, stop ring, and locking element into a single integrated elastic element with axial and radial portions. The axial portion provides stop function while the radial portion provides elastic dampening, eliminating the need for separate components and simplifying the overall structure while maintaining recoil dampening effectiveness.
Solution Approach 2:
The elastic element is segmented into functional portions (axial portion for stopping, radial portion for elastic dampening) that work together as an integrated component. This segmentation of functions within a single component achieves the desired recoil management without requiring multiple separate parts.
2Stability of the object's composition
If the elastic element is constrained from expanding during operation, then the structure remains compact, but stress and strain accumulate leading to reduced lifetime
Solution Approach 1:
The elastic element is designed to dynamically expand radially outward during operation when heated or compressed, rather than being rigidly constrained. This dynamic behavior allows the element to accommodate thermal and mechanical stresses, preventing stress accumulation and extending the component's operational lifetime while maintaining structural integrity.
Solution Approach 2:
The elastic element's physical parameters (temperature, volume, shape) are allowed to change during operation. The element expands when heated or compressed, and this parameter change is accommodated by the design rather than prevented, thereby avoiding stress concentration and potential failure.
3Ease of manufacture
If a simple elastic element design is used, then manufacturing is easier, but effective recoil dampening may be insufficient
Solution Approach 1:
The elastic element exhibits different local qualities in different portions: the axial portion is optimized for providing stop function with appropriate stiffness, while the radial portion is optimized for elastic deformability to absorb recoil energy. This local differentiation of properties within a single component achieves effective recoil dampening while maintaining manufacturing simplicity.
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 significantly reduces vibration and noise, enhancing operator safety and reducing environmental disruption by effectively absorbing recoil forces, while allowing the elastic element to expand and prevent stress-related damage.
Implementation Method 1
an elastic element (18) that is arranged radially outwards from the percussion piston (16) to dampen the recoil from the shank adaptor (12)
Implementation Method 2
a percussion piston (16) that is arranged to carry out a reciprocating movement caused by the pressure from a hydraulic fluid
Data Source
AI summary
A percussion device including a shank adaptor, a machine housing that contains a percussion piston that is arranged to carry out a reciprocating movement caused by the pressure from a hydraulic fluid and to strike the shank adaptor when the percussion device is in use. An elastic element is arranged radially outwards from the percussion piston to dampen the recoil from the shank adaptor. The machine housing has an inner surface that faces the percussion piston. The elastic element has an inner surface that faces the percussion piston and an outer surface that faces the inner surface of the machine housing. At least a part of the outer surface of the elastic element directly faces the inner surface of the machine housing.