Transmission Oil Pump Layout for Sealing and Service Access
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Solution Overview
Problem
Existing oil pump arrangements for motor vehicle transmissions face issues with sealing problems and increased installation space requirements, particularly due to externally mounted auxiliary oil pumps, which can lead to leakage and require additional space outside the transmission housing.
Innovation Solution
The oil pump arrangement integrates the pump part within the transmission housing, allowing the pump motor to be mounted externally, eliminating leakage issues and reducing external space requirements. This configuration includes an intermediate shaft for power transmission between the pump motor and pump part, which is articulated to compensate for angular errors and minimize frictional losses, and a control unit connected via electrical lines for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the auxiliary oil pump is mounted externally on the transmission housing, then the pump motor is accessible for replacement, but sealing problems and leakage occur at the connection points
Solution Approach 1:
The pump motor is nested within the transmission housing, with the pump part positioned inside the oil chamber and the motor integrated into the housing structure. This nested arrangement eliminates external connection points and sealing interfaces, thereby preventing leakage while maintaining system accessibility through the housing's inherent service openings.
Solution Approach 2:
The pump motor and transmission housing are merged into a single integrated unit, where the motor is mounted directly on the housing and the pump part is positioned inside the oil chamber. This merging eliminates separate connection points and sealing interfaces between external components, thereby preventing leakage while maintaining system functionality.
2Ease of repair
If the auxiliary oil pump is mounted externally on the transmission housing, then the pump motor is accessible for replacement, but additional installation space is required outside the housing
Solution Approach 1:
The pump motor is nested within the transmission housing structure, utilizing the existing housing volume rather than requiring external mounting space. The motor is positioned inside the housing with the pump part inside the oil chamber, thereby eliminating the need for additional external installation space while maintaining accessibility through service openings.
Solution Approach 2:
The pump motor is positioned in the vertical dimension within the housing rather than requiring horizontal external mounting space. By utilizing the vertical space within the housing and positioning the motor above the oil chamber, the design eliminates the need for additional external installation area.
3Reliability
If the pump part is positioned inside the oil chamber, then sealing problems are eliminated, but the pump motor becomes less accessible
Solution Approach 1:
The pump assembly is segmented into the pump part inside the oil chamber and the motor section accessible through service openings. This segmentation allows the pump part to remain sealed within the oil chamber while the motor can be serviced through accessible openings in the housing, maintaining both sealing reliability and ease of repair.
4Loss of energy
If the intermediate shaft is articulated to compensate for angular errors, then frictional losses are minimized, but the mechanical complexity increases
Solution Approach 1:
The intermediate shaft is designed as an articulated dynamic connection rather than a rigid fixed connection. This allows the shaft to adapt its angle during operation to minimize frictional losses while transmitting power between the motor and pump part, accepting the necessary increase in mechanical complexity to achieve energy efficiency.
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 prevents sealing issues, reduces external space needs, allows easy replacement of the pump motor without disassembling the gearbox, and enhances efficiency by minimizing frictional losses and heat absorption, while providing independent oil supply for cooling and actuators, optimizing power usage and component cooling.
Implementation Method 1
An intermediate shaft connects the pump part and the pump motor to one another
Implementation Method 2
The intermediate shaft is articulated to compensate for angular errors
Implementation Method 3
a pump motor (4), in particular an electric pump motor, which can be mounted on the housing (5) from the outside
Data Source
Figure 1
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Figure 3
AI summary
The invention relates to an oil pump arrangement (1) for a motor vehicle, comprising an oil pump (2) having a pump part (3) and an electric pump motor (4), wherein the pump part (3) is in operative connection with the pump motor (4), the pump part (3) and/or the pump motor (4) being mountable to a housing (5), the housing (5) partially delimiting an oil chamber (7). Tightness problems on the pump part (3) are prevented and the required installation space is low because the pump part (3) can be mounted within the housing (5) and the pump motor (4) can be mounted from the outside to the housing (5).