Trochoidal Oil Pump Tooth Profile for Pulsation Reduction
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Solution Overview
Problem
Existing trochoidal oil pumps face challenges in reducing discharge pulsation and noise due to limited communication passages and engagement issues between the inner and outer rotors, which affect pump efficiency and stability.
Innovation Solution
The design incorporates a trochoidal oil pump with a rotor chamber featuring a maximum sealed space between the intake and discharge ports, with tooth shapes formed by trochoidal curves, non-contact regions, and recessed parts on the tooth surfaces to enhance communication and engagement, stabilizing rotational driving and improving fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If circular arc parts are formed in the centers of the top parts of the outward-facing engaging teeth with rectilinear parts connecting to initiation points of engagement, then a large clearance is ensured between top parts of inward-facing and outward-facing engaging teeth, but the rectilinear parts have an extremely limited small range and it is extremely difficult to ensure sufficient size of sealing parts and rectilinear parts in the limited range
Solution Approach 1:
The patent applies trochoidal curves to form the tooth shapes of both inner and outer rotors, replacing the conventional circular arc profiles. This curved geometry enables the creation of adequately sized sealing parts and rectilinear parts while maintaining necessary clearance between engaging teeth, resolving the contradiction between clearance requirements and manufacturable part sizes.
Solution Approach 2:
The patent differentiates the tooth profile into distinct functional zones: engagement parts for stable rotational driving, sealing parts for preventing fluid leakage, and rectilinear parts for forming communication passages. By optimizing each local region's geometry according to its specific function, the patent ensures sufficient size for all components within the limited tooth surface range.
2Object-affected harmful factors
If non-contact parts are formed on the outward-facing engaging teeth to create communicating passages, then it is difficult to vary the size range of these communicating passages or to ensure a sufficiently large size, but increasing the size of non-contact parts reduces the engaging parts and makes it difficult to stabilize rotational driving
Solution Approach 1:
The patent divides the tooth surface into functionally optimized zones: engagement parts that maintain stable rotational driving, sealing parts that prevent fluid leakage, and rectilinear non-contact parts that form adequately sized communication passages. This local differentiation allows the non-contact parts to be sufficiently large for effective noise and pulsation reduction while preserving adequate engagement parts for stable operation.
Solution Approach 2:
The trochoidal curve geometry enables optimal distribution of tooth surface areas among engagement, sealing, and non-contact regions. The curved profile maximizes the available range for non-contact parts forming communication passages without compromising the engagement parts, allowing effective noise control while maintaining rotational stability.
3Productivity
If the volume space between rotors in the partition part is at a maximum and communicates with the intake port in a state in which the volume space is not closed off, then the back flow of fluid cannot be prevented, but closing off the volume space reduces the communication between adjacent volume spaces
Solution Approach 1:
The patent employs trochoidal curves to shape the teeth of both rotors, creating an optimized inter-tooth space geometry. This curved design enables the volume spaces to be effectively closed off for preventing back flow while maintaining adequate communication between adjacent spaces through the rectilinear non-contact parts, resolving the contradiction between pump efficiency and space isolation.
Solution Approach 2:
The patent segments the tooth profile into distinct functional regions: engagement parts for mechanical driving, sealing parts for fluid isolation, and rectilinear non-contact parts for inter-space communication. This segmentation allows the volume spaces to be closed off for efficiency while maintaining necessary communication pathways between adjacent spaces.
Data Source
AI summary
A trochoidal oil pump which makes it possible to achieve an improved reduction in discharge pulsation and noise, and which makes it possible to realize such a reduction using an extremely simple structure. The trochoidal oil pump of the present invention comprises a rotor chamber 1 which has an intake port 2 and discharge port 3, an outer rotor 6 and an inner rotor 5. A plurality of inter-tooth spaces S, S, . . . that are formed by the tooth shapes 5a and 6a of the inner rotor 5 and outer rotor 6 comprise a maximum sealed space Smax that is positioned in the region of the partition part 4 between the intake port 2 and discharge port 3, a plurality of inter-tooth spaces S, S, . . . within the region of the intake port 2, and a plurality of inter-tooth spaces S, S, . . . within the region of the discharge port 3. The plurality of inter-tooth spaces S, S, . . . in the intake port 2 and discharge port 3 respectively communicate with each other