Hydraulic Steering Segmented Pipe Bypass
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydraulic steering systems face issues when a valve in the reaction suppression arrangement gets stuck, blocking the pipe between the steering unit and the steering motor, preventing the driver from steering the vehicle via the steering unit, and existing solutions do not ensure safe steering in emergency situations.
Innovation Solution
A hydraulic steering system with a directional section having two outlets connected to the steering motor via separate pipes, where one pipe is interruptible by a valve arrangement, allowing for reaction behavior in the neutral position and enabling steering via the steering valve if the primary pipe is blocked, with a normally open valve arrangement activated by hydraulic pressure, ensuring fluid bypass and reduced resistance during steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a valve arrangement interrupts the first pipe to suppress reaction behavior when steering via the steering valve, then steering control is improved, but the system becomes vulnerable to valve sticking which blocks the pipe and prevents steering via the steering unit
Solution Approach 1:
The hydraulic connection between the directional section and steering motor is segmented into two separate pipes (first pipe and second pipe) instead of using a single pipe with a valve. The valve arrangement is only connected to the first pipe, while the second pipe remains as a permanent bypass route. This segmentation ensures that even if the valve sticks in the closed position, steering is still possible through the second pipe.
Solution Approach 2:
The second pipe acts as an intermediary bypass route that mediates between the valve arrangement and the steering motor. When the valve arrangement interrupts the first pipe, the second pipe provides an alternative pathway for hydraulic fluid to reach the steering motor, ensuring continuous steering capability even when the primary path is blocked.
2Adaptability or versatility
If a reaction suppression arrangement with a valve is used to allow steering via the steering valve, then steering versatility is improved, but if the valve gets stuck, the driver can no longer steer via the steering unit
Solution Approach 1:
The hydraulic system is segmented into two independent pathways: the first pipe controlled by the valve arrangement for reaction suppression, and the second pipe as a permanent bypass. This segmentation allows the system to switch between steering modes (via steering unit or steering valve) while maintaining reliability, as the second pipe ensures steering availability even when the valve is stuck.
Solution Approach 2:
The second pipe is预先 (in advance) established as a backup pathway to cushion against the potential failure of the valve arrangement. By having this redundant bypass route built into the system from the beginning, the design prepares for the possibility of valve sticking, ensuring that steering remains available even when the primary reaction suppression mechanism fails.
3Ease of operation
If the valve arrangement remains in the interruption position due to sticking, then reaction suppression is maintained, but steering via the steering unit is prevented
Solution Approach 1:
By segmenting the hydraulic connection into two separate pipes with the valve only controlling the first pipe, the system maintains adaptability even when the valve is stuck. The second pipe remains open and accessible, allowing the driver to switch to steering via the steering unit even when reaction suppression is inadvertently activated, thus preserving steering mode selection flexibility.
Solution Approach 2:
The second pipe serves as an intermediary that enables alternative steering mode selection when the primary path is blocked by a stuck valve. This bypass route allows hydraulic fluid to reach the steering motor through a different path, enabling the driver to use the steering unit for vehicle control even when the valve arrangement prevents normal operation through the first pipe.
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
Ensures safe and reliable steering by maintaining reaction behavior and allowing vehicle control via the steering unit or valve, even if the valve arrangement is stuck, with minimal impact on steering behavior and no additional energy required for valve activation.
Implementation Method 1
a valve arrangement (27) which releases or interrupts the first pipe (23, 24), in particular which is a normally open valve arrangement, which is activated by hydraulic pressure
Implementation Method 2
Forces acting upon the steering motor are transferred via the first pipe to the first outlet and via the directional section to the measuring motor
Data Source
AI summary
The invention concerns a hydraulic steering (1) with a supply connection arrangement (P, T), a steering motor (2) and a steering unit (3) between the supply connection arrangement and the steering motor (2), the steering unit (3) having a directional section (4) and a measuring section (5), a steering valve (9) being arranged in parallel to the steering unit (3). With such a steering, it is endeavored to achieve the best possible safety. For this purpose, it is ensured that for each steering direction the directional section (4) comprises a first outlet (A1L, A1R), which is connected to the steering motor (2) by means of a first pipe (23, 24), and a second outlet (A2L, A2R), which is connected to the steering motor (2) by means of a second pipe (25, 26), the first outlet (A1L, A1R) being, in the neutral position of the directional section (4), connected to the measuring section (5), and the first pipe (23, 24) being interruptible by means of a valve arrangement (27, 27a).