Pyrotechnic Actuator Piston Resin Fixation Assembly
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Solution Overview
Problem
Conventional pyrotechnic actuators used in vehicle restraining devices, such as airbag systems and pedestrian protection systems, face difficulties in piston fixation and assembly due to the use of shear pins, which complicate the insertion process and make assembly challenging.
Innovation Solution
The use of a resin portion integrated with the piston, which contacts a member including the housing to prevent piston movement before actuation, allowing for easier assembly and instantaneous movement upon igniter activation, eliminating the need for shear pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shear pin is used to fix the piston before actuation, then the piston can be reliably prevented from moving, but the assembly process becomes complicated and difficult
Solution Approach 1:
The invention removes the shear pin component entirely from the system. Instead of using a separate shear pin to prevent piston movement, the piston is directly fixed to the combustion chamber wall through integrated fixing structures (such as fixing grooves or fixing protrusions), thereby eliminating the complicated insertion and assembly process associated with shear pins while maintaining reliable piston fixation.
2Stability of the object's composition
If a shear pin is used to prevent piston movement, then the piston remains stable before actuation, but the insertion operation becomes difficult and time-consuming
Solution Approach 1:
The invention merges the piston fixing function directly into the piston structure and combustion chamber wall structure. The fixing grooves and fixing protrusions are integrated into the respective components during manufacturing, eliminating the need for separate shear pin insertion operations. This reduces assembly time while ensuring the piston remains stable before actuation through the integrated fixing structures.
3Reliability
If conventional shear pin fixation is used, then the piston can be secured, but the overall device complexity increases
Solution Approach 1:
The invention extracts and removes the shear pin component from the device. By eliminating this separate component and its associated insertion mechanism, the overall device complexity is reduced. The piston fixation reliability is maintained through integrated fixing structures that are part of the basic piston and combustion chamber wall design, rather than requiring additional separate components.
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 solution simplifies the assembly process and ensures reliable piston fixation and instantaneous movement upon actuation, enhancing the operational efficiency of pyrotechnic actuators in vehicle restraining devices.
Implementation Method 1
the resin portion being disposed in contact with a member including the housing, the piston being fixed by contacting the resin portion to the member including the housing
Implementation Method 2
an igniter disposed within the housing for causing the piston to slide
Implementation Method 3
a head having a pressure-receiving surface with which a combustion product, produced by actuation of the igniter, collides
Data Source
AI summary
The present invention relates to a pyrotechnic actuator, containing:a housing,a piston slidable inside the housing,an igniter disposed within the housing and causing the piston to slide,the piston including a piston head having a pressure-receiving surface with which a combustion product, produced by actuation of the igniter, collides,a piston rod extending from the piston head and further,a resin portion provided at least in a part of the piston,the resin portion being disposed in contact with a member including the housing,the piston being fixed by contacting the resin portion to the member including the housing, andthe piston being prevented from moving before activation of the igniter.