Rail Wiper Drive Pneumatic System with Parallel Emergency Lines
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Solution Overview
Problem
Electropneumatic windshield wiper drives for rail vehicles are costly due to the need for extensive special components, and existing solutions lack reliable emergency operation mechanisms.
Innovation Solution
The implementation of a piston guide device with parallel normal and emergency operation connection lines, utilizing standard components and a valve device to ensure alternating rotational movement of the wiper shaft, even in the event of pneumatic valve failure, without the need for additional control or damper pistons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive special components are used in electropneumatic windshield wiper drives, then the required torque and reliable operation are achieved, but the construction cost increases significantly
Solution Approach 1:
The pneumatic system is segmented into separate normal operation and emergency operation circuits. Each circuit has its own valve device and connection lines, allowing independent operation. This segmentation enables the system to maintain reliability through redundancy while using standard components rather than extensive special components.
Solution Approach 2:
The emergency operation connection lines and valve devices are pre-installed and configured as backup systems. In normal operation, these emergency components remain standby, but they ensure reliable operation if a failure occurs. This beforehand preparation resolves the contradiction by providing reliability assurance without requiring the emergency system to be actively complex during normal operation.
2Reliability
If multiple locking pistons and valves are added to ensure safe operation, then reliability improves, but device complexity and cost increase
Solution Approach 1:
The valve device serves multiple functions: it controls normal operation through normal connection lines and emergency operation through emergency connection lines. The same basic valve structure and piston guide device are used in both normal and emergency modes, reducing the need for separate specialized components for each function.
Solution Approach 2:
The emergency operation circuit is essentially a copy of the normal operation circuit, with parallel connection lines and valve devices. This copying approach ensures reliable safe operation through redundancy while using standard, proven components rather than designing entirely new special components.
3Reliability
If parallel normal and emergency operation connection lines are implemented, then emergency operation reliability is ensured, but pneumatic system complexity increases
Solution Approach 1:
The normal and emergency operation circuits are merged into a single integrated pneumatic system with shared components where possible. The piston guide device, force transmission device, and wiper shaft are common to both operations, while only the connection lines and valve control paths are duplicated. This merging reduces overall complexity compared to having completely separate systems.
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 reduces component complexity and cost, ensures reliable operation, and allows for safe emergency operation by using standard components, eliminating the need for extensive special components and additional installation space.
Implementation Method 1
a first normal operation connection line and a first emergency operation connection line parallel thereto, which are designed to connect a supply connection for a compressed air supply for the pneumatic system to the first connection of the drive
Data Source
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AI summary
The present invention relates to a pneumatic system (120) for operating a drive (110) for a windshield wiper for a rail vehicle, said windshield wiper drive (110) having a piston guide device (140) that has a first connection (143) and a second connection (146) that is opposite said first connection (143). At least one piston (150) provided in said piston guide device (140) is designed to carry out linear movements in opposite directions along the main direction of extension of the piston guide device (140) in order to bring about an alternating rotational movement of the wiper shaft (156). The pneumatic system has a supply connection (158) for a compressed air supply (160), said supply connection being connected to the first connection (143) via a first normal operation connection line (172) and a first emergency operation connection line (174) arranged parallel thereto and to the second connection (146) via a second normal operation connection line (176) and a second emergency operation connection line (178) arranged parallel thereto. A valve mechanism (180) is designed to couple the supply connection (158) to the first connection (143) via the first normal operation connection line (172) and to the second connection (146) via the second normal operation connection line (176) when the pneumatic system (120) is in normal operation, and to couple the supply connection (158) to the first connection (143) via the first emergency operation connection line (174) and to the second connection (146) via the second emergency operation connection line (178) when the pneumatic system (120) is in emergency operation in order to bring about the alternating rotational movement of the wiper shaft (156).