Hydraulic Module Delivery Riser for Standstill Oil Level Retention
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Solution Overview
Problem
Existing hydraulic modules for electric axles in sporty vehicles face challenges in ensuring timely oil supply to cool electric machines without delay, requiring complex components like check valves to prevent oil flow during standstill.
Innovation Solution
A hydraulic module with a delivery riser integrated into the pump housing, eliminating the need for check valves, ensures oil level maintenance in the collecting container by geometrically simple means, utilizing a slim design that minimizes installation space and enhances mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If check valves are used to prevent oil flow during standstill, then oil level maintenance is ensured, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the check valve component from the hydraulic system by redesigning the delivery outlet geometry. The delivery riser is shaped to naturally prevent oil flow during standstill through its geometric configuration alone, removing the need for mechanical checking components and thereby reducing device complexity while maintaining reliability.
Solution Approach 2:
The delivery riser structure serves itself to prevent oil flow during standstill through its own geometric design. The narrowing toward the delivery opening and specific height create a self-regulating mechanism that uses the oil's own weight and the riser's geometry to prevent backflow, without requiring additional active or passive components.
2Volume of moving object
If a slim delivery riser is used, then installation space is reduced, but mechanical strength may be compromised
Solution Approach 1:
The delivery riser employs asymmetric geometry with a width that decreases from the pump housing toward the delivery opening. This asymmetric tapering optimizes the structure to achieve maximum mechanical strength with minimum material, allowing the slim design to withstand operational stresses while minimizing installation space requirements.
Solution Approach 2:
The cross-sectional dimensions of the delivery riser are varied along its length, with the width parameter decreasing from base to top. This parameter change creates a tapered structure that is stronger at the base where loads are highest and progressively thinner toward the opening, optimizing the strength-to-space ratio.
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 solution provides efficient oil supply and cooling to electric machines without complex components, optimizing space utilization and ensuring reliable oil levels during standstill, facilitating easy assembly and sealing.
Implementation Method 1
with the delivery riser a geometrically very simple component is used to ensure that, during a standstill, the oil in the collecting container cannot drop below a specific level, namely below the level formed by the height of the delivery riser
Implementation Method 2
the oil collecting in the electric machine is then drawn in by means of the hydraulic module and pumped into a collecting container
Implementation Method 3
The electric machine is fed oil, in particular in order to cool the winding overhangs of the stator
Data Source
AI summary
A hydraulic module for a drive unit of a motor vehicle, including a hydraulic pump, an electric motor, an electronics unit, a suction opening formed on a pump housing of the hydraulic pump, and a delivery outlet located at the end of a delivery riser, which is formed on the side of the pump housing remote from the suction opening. An assembly includes an oil pan and such a hydraulic module. The connection socket extends through a connection opening in the bottom of the oil pan and in that the hydraulic module is screwed to the bottom of the oil pan such that the edge of the suction opening is pressed against the bottom of the oil pan.