Multigear Axle Drive Hydraulic Circuit With Passive Clutch Pressure Relief
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Solution Overview
Problem
In electrically operable multigear axle drive trains of motor vehicles, existing hydraulic systems face challenges in preventing unwanted wheel blockages and torque applications due to potential malfunctions of switching valves, which can lead to safety issues and operational inefficiencies.
Innovation Solution
A hydraulic arrangement with a circuit including a hydraulic pump, first and second clutch devices, and passive bypass valves in separate hydraulic paths, allowing for quick pressure reduction and ensuring secure operation even in case of switching valve malfunctions, implemented in a cost-effective and reliable manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching valves are used to control clutch devices for gear selection, then gear changing capability is improved, but safety against unwanted wheel blockage deteriorates due to potential valve malfunctions
Solution Approach 1:
A passive bypass valve is introduced as an intermediary safety mechanism between the switching valve and the clutch device. This bypass valve provides an alternative hydraulic path that can release pressure from the clutch device independently of the switching valve, preventing unwanted wheel blockage even when the switching valve malfunctions.
Solution Approach 2:
The hydraulic system is divided into separate hydraulic paths for each clutch device, with each path having its own dedicated bypass valve. This localized safety mechanism ensures that a malfunction in one path does not affect other paths, providing targeted protection against unwanted torque application or wheel blockage in specific gears.
2Reliability
If a complex hydraulic system with multiple valves is used to ensure safety, then reliability is improved, but device complexity increases
Solution Approach 1:
The bypass valve is designed as a passive, self-activating component that automatically opens when hydraulic pressure exceeds a predetermined threshold. This eliminates the need for additional sensors, control units, or active control mechanisms, maintaining system simplicity while providing reliable safety protection.
Solution Approach 2:
The bypass valve is implemented as a simple, inexpensive mechanical component with no moving parts requiring maintenance or replacement. Its passive design and robust construction make it a cost-effective safety element that can withstand harsh operating conditions without adding complexity to the overall hydraulic system.
3Reliability
If separate hydraulic paths with bypass valves are added for each clutch device, then safety is improved, but manufacturing cost increases
Solution Approach 1:
The bypass valve design is standardized and can be used across multiple hydraulic paths for different clutch devices. This universal component approach allows for economies of scale in manufacturing and assembly, reducing the per-unit cost despite the increased number of safety components in the overall system.
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 hydraulic arrangement provides enhanced security against unwanted wheel blockages by enabling rapid pressure reduction and maintaining operational reliability, reducing energy consumption and operational costs while ensuring safe clutch device operation.
Implementation Method 1
at least one hydraulic pump for applying pressure to the hydraulic fluid within the hydraulic circuit
Implementation Method 2
the first hydraulic path has a first non-return valve for connection to the hydraulic circuit
Implementation Method 3
at least one passive bypass valve is arranged in the third hydraulic path and/or the fourth hydraulic path
Data Source
AI summary
A hydraulic arrangement for an electrically operable, multigear axle drive train of a motor vehicle comprises a hydraulic circuit in which a hydraulic fluid is guided, a hydraulic pump arranged to apply pressure to the hydraulic fluid within the hydraulic circuit, a first hydraulic path arranged to connect a first clutch device to the hydraulic circuit, and a second hydraulic path arranged to connect a second clutch device to the hydraulic circuit. The first and second clutch devices are each arranged to actuate a gear selection device of the electrically operable axle drive train.