Divided Hydraulic Pump Storage Container for Leakage Resilience
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Solution Overview
Problem
Current pump units for motor vehicle drive trains, particularly clutch and gearbox actuators, face reliability issues due to hydraulic leakage, which can cause entire systems to fail, disrupting gear shifting and vehicle operation.
Innovation Solution
The pump unit is designed with a divided storage container having two chambers, each with an intake opening, allowing one circuit to remain operational in case of leakage, ensuring the vehicle can still operate in limited gear stages, and solenoid valves are integrated within the storage container for cooling and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common storage container for hydraulic fluid is used for both circuits, then the device complexity is reduced, but the reliability deteriorates because a hydraulic leakage in one circuit can cause the entire system to fail
Solution Approach 1:
The storage container is divided into two separate chambers (first chamber and second chamber), with each chamber serving one hydraulic circuit independently. This segmentation ensures that a leakage in one circuit does not affect the other circuit, as each chamber maintains its own hydraulic fluid supply. The pump has separate intake openings for each chamber, further enforcing the independence of the two circuits.
2Reliability
If the storage container is divided into two chambers with separate intake openings, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The storage container is divided into two separate chambers (first chamber and second chamber), with each chamber serving one hydraulic circuit independently. This segmentation ensures that a leakage in one circuit does not affect the other circuit, as each chamber maintains its own hydraulic fluid supply. The pump has separate intake openings for each chamber, further enforcing the independence of the two circuits.
3Ease of operation
If solenoid valves are arranged outside the storage container, then the ease of operation is improved, but the reliability deteriorates due to environmental influences and corrosion
Solution Approach 1:
The solenoid valves are integrated into the storage container, with each solenoid valve positioned within one of the chambers. This merging of the solenoid valves with the storage container provides several benefits: the solenoid valves are directly cooled by the hydraulic fluid in their respective chambers, they are protected from environmental influences and corrosion, and the overall device complexity is reduced by eliminating separate mounting structures.
4Ease of manufacture
If the intake openings are arranged away from the base of the chamber, then the ease of manufacture is improved, but the productivity deteriorates due to increased dead volume
Solution Approach 1:
The intake openings are positioned at the base of each chamber, which is the most efficient location for maximizing the working volume of hydraulic fluid. This positioning ensures that the dead volume (the volume of hydraulic fluid that does not participate in the working cycle) is minimized. By preliminarily optimizing the intake opening position during the design phase, the system achieves maximum productivity without compromising manufacturability.
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 enhances operational reliability by allowing continued vehicle operation in case of hydraulic leakage, enabling safe driving even with limited gear stages, and ensures constant damping behavior and protection of solenoid valves.
Implementation Method 1
the two solenoid valves can be cooled directly by the hydraulic fluid
Implementation Method 2
The pump unit serves to provide a hydraulic pressure which is controlled or regulated by activation of the solenoid valve
Data Source
AI summary
Pump unit for providing a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch actuator or gearbox actuator, with a pump (2), a storge container (6) for hydraulic fluid and two pressure outlets (20), characterized in that the storage container (6) is divided into two chambers (40, 42), wherein a first intake opening (44) of the pump (2) is arranged in one chamber (40) and a second intake opening (44) of the pump (2) is arranged in the other chamber (42).