External Electric Oil Pump for Power Transmission
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Solution Overview
Problem
Existing internal oil pumps in vehicles are inefficient as they continuously operate at high speeds, leading to energy waste, and face challenges in being controlled electrically due to their sealed environments, making it difficult to supply electric signals.
Innovation Solution
An externally mounted electric fluid pump with a gerotor design, driven by an electric motor and controlled by a controller, which allows for efficient operation and easy electrical connectivity through a housing with recesses and a gerotor pump assembly featuring an inner and outer rotor with a rotor shaft and permanent magnets, enabling variable fluid flow and over-pressure protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an internal oil pump is continuously driven by a rotating member of the vehicle powertrain, then the pump structure is simple, but energy is wasted when high fluid flow is not required
Solution Approach 1:
The pump system transitions from a continuously driven internal pump to a dynamically controllable electric auxiliary pump that can be activated or deactivated based on real-time fluid flow requirements, allowing the system to adapt its operation state rather than maintaining constant operation
Solution Approach 2:
The pump function is extracted from the internal powertrain rotating member and separated into an external electrically-driven auxiliary pump, allowing independent control of the pumping function from the powertrain operation
2Reliability
If the pump is sealed within cavities formed by engine or transmission housings, then the pump is protected, but it is difficult to supply electric signals to control actuators
Solution Approach 1:
The pump system is segmented into separate functional modules: the sealed pump cavity for fluid handling and the external controller for electrical operations, allowing each to be optimized independently for their respective functions
Solution Approach 2:
An external controller serves as an intermediary between the electrical system and the sealed pump actuator, transmitting control signals through the housing without requiring direct wire penetration into the sealed cavity
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 fluid pumping with reduced energy waste and allows for effective electrical control, improving operational efficiency and ease of integration with vehicle power transmission systems.
Implementation Method 1
An electric motor is positioned within the housing and drives the input member
Implementation Method 2
A plurality of permanent magnets is fixed for rotation with the outer rotor, the magnets being positioned proximate the stator
Data Source
AI summary
An externally mounted electric fluid pump for pumping fluid within a power transmission device is disclosed. The pump includes a housing adapted to be mounted to an external surface of the power transmission device. The pump is positioned within the housing and includes an input member. An electric motor is positioned within the housing and drives the input member. A controller is positioned within the housing to control the electric motor and vary the output of the pump.