Dual Motor Electric Pump for Power Steering
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Solution Overview
Problem
Electrically driven pumps used in power-assisted steering systems face limitations in power output due to technological constraints, particularly the lack of high-powered motors for 12V systems, which cannot meet the increasing power demands of heavier vehicles.
Innovation Solution
The design incorporates two hydraulic pumps and two electric motors integrated into a common housing with shared manifolds for suction and delivery, allowing the motors to work together to increase power output, with features like check valves and motor piloting to optimize performance and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single high-powered motor is used to meet increasing power demands, then power output is improved, but technological feasibility deteriorates due to lack of available high-powered motors for 12V systems
Solution Approach 1:
The pump system is divided into two separate pump units, each driven by its own motor. This segmentation allows the use of two available lower-powered motors (each capable of delivering at least 1.5 kW) instead of requiring a single unavailable high-powered motor, thereby achieving the required total power output while maintaining technological feasibility for 12V systems.
Solution Approach 2:
Two pump units with individual motors are combined into a single integrated system with common suction and delivery manifolds. This merging allows the power outputs of both motors to be additive, achieving the required high total power output while using only commercially available motor technologies for 12V systems.
2Power
If two pumps and two motors are integrated into a common housing, then power output is improved, but device complexity increases
Solution Approach 1:
Two complete pump-motor units are merged into a single integrated assembly with shared components including a common pump housing, common suction manifold, and common delivery manifold. This merging reduces overall system complexity compared to having two completely separate units, while still achieving additive power output from both motors.
Solution Approach 2:
The common manifolds and pump housing serve multiple functions: they provide structural support, enable fluid distribution to both pumps, facilitate additive power output, and reduce the number of separate components needed. This multi-functionality reduces overall system complexity despite incorporating two complete pump-motor units.
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 configuration enhances power delivery, reduces noise and pressure pulsations, and provides redundancy to prevent assisted shutdowns, effectively addressing the power limitations of existing systems while maintaining a compact design.
Implementation Method 1
two electric motors that are fitted in such a way as to make it possible to obtain the unit's power by adding together the power of the two motors
Implementation Method 2
at least one hydraulic pump, particularly with gears, set in revolving motion by a motor device
Implementation Method 3
at least one of the pumps consists, in its path of delivery, of a check valve so that this pump can be stopped selectively
Data Source
AI summary
An electrical driven pump unit having two hydraulic pumps and two electric motors that are fitted in such a way as to make it possible to obtain the unit's power by adding together the power of the two motors.