Electric Oil Pump Housing Layout for Reduced Thickness and Better Cooling
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Solution Overview
Problem
Existing electric oil pumps face challenges with increased thickness dimension due to orthogonal substrate placement, limited installation space, and insufficient housing strength and rigidity, leading to reliability concerns.
Innovation Solution
The electric oil pump design integrates the pump, motor, and substrate units along a tangential direction, with a unified housing that includes pump, motor, and substrate accommodation units, enhancing strength and rigidity while optimizing substrate placement for compactness and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the substrate is disposed in a direction orthogonal to the output shaft axis, then the control circuit can be effectively laid out, but the thickness dimension of the electric oil pump increases
Solution Approach 1:
The substrate is repositioned from an orthogonal orientation to a tangential orientation relative to the motor unit axis. This dimensional reorientation allows the substrate to be arranged along the circumferential direction of the motor, effectively utilizing the radial space and reducing the axial thickness dimension of the overall pump assembly while maintaining sufficient area for control circuit layout.
2Ease of manufacture
If the housing is divided at multiple places and screwed together, then assembly and disassembly become easier, but the strength and rigidity of the housing are insufficient
Solution Approach 1:
The housing is designed as an integrated single-piece structure that accommodates the pump unit, motor unit, and substrate simultaneously. This merging of multiple housing sections into one monolithic component eliminates the need for screws and joints, thereby maximizing structural strength and rigidity while maintaining the necessary compartmentalization for different functional units.
3Length of stationary object
If the substrate is disposed tangentially along the motor unit axis, then the thickness dimension is reduced, but the installation space becomes more limited
Solution Approach 1:
The substrate is arranged in the tangential direction, utilizing the circumferential space around the motor unit rather than extending axially. This repositions the substrate in a different spatial dimension, reducing axial thickness while the radial and circumferential dimensions provide adequate area for electronic component mounting and wiring.
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 results in a compact, highly reliable electric oil pump with improved heat dissipation and reduced electromagnetic susceptibility, ensuring efficient operation and enhanced reliability.
Implementation Method 1
the housing body can be cooled by the oil flowing through the suction-side oil flow path and the discharge-side oil flow path. With this cooling effect, the cooling of the motor unit and the substrate, which are heat sources, can be promoted
Implementation Method 2
the housing body can be cooled by the oil flowing through the suction-side oil flow path and the discharge-side oil flow path
Data Source
AI summary
An electric oil pump 1 includes: a pump unit 2 that generates hydraulic pressure; a motor unit 3 that drives the pump unit; a substrate 4 on which a control circuit for controlling the motor unit 3 is formed by a plurality of electronic components 41; and a housing 5 equipped with a pump accommodation unit 53 that houses the pump unit, a motor accommodation unit 54 that houses the motor unit, and a substrate accommodation unit 55 that houses the substrate. The substrate 4 is disposed along the tangential direction of a circle about the axis of the motor unit 3. The pump accommodation unit 53, the motor accommodation unit 54, and the substrate accommodation unit 55 are integrally formed.