Composite Piston Structure for Electromagnetic Portable Tools
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Solution Overview
Problem
Existing portable electric tools suffer from reduced service life due to numerous shocks experienced by pistons, weak output, and high weight, particularly in nail driving tools.
Innovation Solution
A portable electric device with a movable piston composed of a first part made from an isotropic, soft magnetic composite material with high resistivity, such as Somaloy, and a second part with damping properties, separated by a braking mechanism, to reduce magnetic losses and withstand shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a movable piston is used in portable electric tools, then mechanical energy can be stored and transmitted, but the piston suffers from numerous shocks that reduce service life
Solution Approach 1:
The piston is divided into two distinct parts: a first part made from soft magnetic composite material for electromagnetic interaction, and a second part made from shock-absorbing material for withstanding impacts. This segmentation allows each part to specialize in its intended function, protecting the electromagnetic components from shock damage while maintaining power transmission capability.
Solution Approach 2:
The piston utilizes composite construction with two different materials: soft magnetic composite material (such as Somaloy) for the first part to reduce magnetic losses and limit induction saturation, and shock-absorbing material for the second part to withstand shocks. This composite approach resolves the contradiction by combining materials with complementary properties.
2Ease of manufacture
If traditional materials are used for the piston, then manufacturing is simple, but magnetic losses increase and induction saturation occurs
Solution Approach 1:
The invention changes the material parameter of the piston from traditional solid metal to soft magnetic composite material with high resistivity. This parameter change reduces eddy current losses and limits induction saturation while maintaining manufacturability through established composite material processing techniques.
3Reliability
If the piston is made from shock-resistant material, then service life improves, but electromagnetic capability decreases
Solution Approach 1:
The piston is segmented into two parts with distinct material properties: the first part uses soft magnetic composite material optimized for electromagnetic interaction, while the second part uses shock-absorbing material optimized for impact resistance. This segmentation allows each part to excel at its specific function without compromising the other.
Solution Approach 2:
Different regions of the piston have different material qualities tailored to their specific functions. The first part has high electromagnetic capability with reduced magnetic losses, while the second part has high shock resistance. This local quality differentiation resolves the contradiction by providing appropriate material properties where needed.
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
The configuration enhances piston durability and shock resistance, improving the service life and output efficiency of the tool while maintaining a balanced weight.
Implementation Method 1
a power supply mechanism intended to supply power to a first fixed coil, the first fixed coil being positioned facing an expulsion mechanism for expelling the piston
Implementation Method 2
at least one braking mechanism for braking the piston that are configured to brake the piston when the piston is in the end position or approaching the end position
Implementation Method 3
a first part made from a first material having an electromagnetic capability suitable for reducing magnetic losses and limiting the induction saturation
Implementation Method 4
isotropic, soft magnetic composite material with high resistivity
Implementation Method 5
a second part made from a second material suitable for withstanding shocks while or after the piston makes contact with the braking mechanism
Data Source
AI summary
A portable electric device comprising a cylinder in which at least one movable piston slides between a start position corresponding to the top of the cylinder and an end position corresponding to the bottom of the cylinder, said piston comprising a mechanism configured to come into contact with an element to be operated once the piston is in the end position or is between the start position and the end position. More particularly, the portable electric device comprises: a power supply mechanism intended to supply power to a first fixed coil, the first fixed coil being positioned facing an expulsion mechanism for expelling the piston when the piston is in the start position, the expulsion mechanism being secured to a first face of the movable piston; and at least one braking mechanism for braking the piston that are configured to brake the piston when the piston is in the end position or approaching the end position. The movable piston being composed of: a first part made from a first material having an electromagnetic capability suitable for reducing magnetic losses and limiting the induction saturation; and a second part made from a second material suitable for withstanding shocks while or after the piston makes contact with the braking mechanism; the first part being separated from said braking mechanism by the second part.