Resin Electric Liquid Pump Structure for Lightweight Mounting
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Solution Overview
Problem
Existing electric liquid pumps face challenges in reducing size and weight due to bulky metal components and limited arrangement freedom of attachment portions, leading to increased mass and difficulty in minimizing overall weight.
Innovation Solution
The electric liquid pump employs a resin material for the motor case and body, integrates attachment portions on the liquid pump side with through-hole shapes, and utilizes a resin rotor and a lubricating liquid circulation system to reduce weight and simplify sealing, allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If attachment portions are provided on the cover in the vicinity of the electric motor, then the pump function is achieved, but the degree of freedom in arrangement of the attachment portion is significantly low and the mass of the electric liquid pump is increased
Solution Approach 1:
The patent moves the attachment portion from the cover (top surface) to the side surface of the case, changing the spatial dimension and location. This allows the attachment portion to be arranged on the side surface rather than being constrained to the cover area near the electric motor, thereby increasing arrangement freedom while avoiding addition to the cover's mass.
Solution Approach 2:
The case is designed to serve multiple functions: it houses the liquid pump components and also provides the attachment portion for mounting. By integrating the attachment function into the case structure itself rather than requiring a separate bulky cover with attachment features, the design reduces overall mass while maintaining versatility.
2Strength
If the case is made of metal to provide structural strength, then the pump function is reliable, but the mass of the electric liquid pump is increased and it is difficult to reduce weight
Solution Approach 1:
The patent changes the material parameter from metal to resin for the case. This material substitution reduces the density and overall mass of the case while maintaining sufficient structural strength through optimized resin formulation and case design, thereby resolving the contradiction between strength and weight.
3Ease of operation
If various three-dimensional structure portions are provided in the vicinity of the electric motor, then the pump function is achieved, but the cover becomes bulky and the mass of the electric liquid pump is increased
Solution Approach 1:
The patent extracts the attachment function from the cover and relocates it to the case. This separation allows the cover to be simplified and reduced in size, removing the need for bulky three-dimensional structures on the cover while maintaining all necessary pump functions through the case's attachment portion.
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 achieves a significant reduction in size and weight while enhancing arrangement freedom and simplifying the sealing mechanism, resulting in a more efficient and lightweight electric liquid pump.
Implementation Method 1
a lubricating liquid circulation system
Data Source
AI summary
An electric liquid pump has a motor, a liquid pump including an inner rotor having an external tooth and integrated with an axial end of a shaft of the motor and an outer rotor having an internal tooth meshing with the external tooth and forming a gap, a motor case having a box shape and including therein first and second accommodation chambers and a partition wall, and a body including a centering body portion, a general body portion, and a bearing portion formed to penetrate the centering body portion and the general body portion. The motor case and the body are made of resins. A connection body portion extends in a radial direction of the shaft. A connection case portion extends in the radial direction. The connection body portion and the connection case portion are provided with attachment portions having a through-hole-shape at positions facing each other.