Integrated Pump Plate and Cam Ring for Electric Pump Heat Dissipation
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Solution Overview
Problem
Existing electric pumps for vehicle brake boosters face issues with heat radiation efficiency, sliding property between the cam ring and vane, and noise reduction due to separate components and materials used, leading to accelerated wear and reduced durability.
Innovation Solution
An electric pump design with an integrated pump plate and cam ring made of aluminum-based materials, featuring a connection unit for enhanced heat dissipation and a hard plating film on the cam surface for improved sliding, along with an expansion space and resonator plate for noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cam ring and pump cover are made as separate members, then the manufacturing and assembly are simplified, but the thermal conductivity between the cam ring and pump cover is blocked, reducing heat radiation efficiency
Solution Approach 1:
The cam ring is integrated with the pump cover as a single unit, eliminating the interface between separate members. This merging ensures continuous thermal conductivity path from the cam ring through the pump cover to the outside environment, solving the heat radiation efficiency problem while maintaining manufacturing feasibility through integral forming processes.
2Temperature
If aluminum-based materials are used for the pump plate and cam ring, then the thermal conductivity is improved for better heat dissipation, but the sliding property between the cam ring and vane deteriorates due to material softness
Solution Approach 1:
The cam ring is constructed as a composite structure with an aluminum-based material substrate providing thermal conductivity, and a hard plating film coating on the cam surface providing wear resistance and improved sliding properties. This composite approach combines the advantages of both materials to resolve the contradiction between heat dissipation and sliding performance.
Solution Approach 2:
The hard plating film is applied locally only to the cam surface where sliding contact occurs, while the bulk aluminum material maintains its high thermal conductivity. This localized treatment optimizes the specific region for sliding while preserving the overall thermal management capability of the component.
3Volume of moving object
If the pump components are made compact, then the overall size is reduced, but the heat radiation space and noise reduction space are limited
Solution Approach 1:
The pump cover is designed with a three-dimensional structure that utilizes the axial dimension for heat radiation. The heat radiation fin structure extends in the axial direction, increasing the heat dissipation surface area without significantly increasing the radial footprint. This dimensional approach allows effective heat radiation within a compact overall volume.
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 design enhances heat radiation efficiency, reduces wear, and decreases noise by improving sliding properties and heat dissipation while maintaining a compact size.
Implementation Method 1
a hard plating film on the cam surface for improved sliding
Implementation Method 2
an integrated pump plate and cam ring made of aluminum-based materials, featuring a connection unit for enhanced heat dissipation
Implementation Method 3
along with an expansion space and resonator plate for noise reduction
Implementation Method 4
resonator plate for noise reduction
Data Source
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AI summary
An electric pump is provided, which includes a motor unit including a rotation shaft, and a pump unit including a rotor having a vane groove accommodating a vane and coupled with the rotation shaft, and including a pump plate including an external wall portion and a cam ring having a cam surface on which the vane slides, and a bottom lid portion provided in the pump plate and being integrally formed with the external wall portion and the cam ring, and a connection unit being provided between the external wall portion and the cam ring to connect the external wall portion and the cam ring and protruding in a direction away from the bottom lid portion, and the connection unit is integrally formed with the external wall portion, the cam ring, and the bottom lid portion.