Oil Pump Taper Surface Extension for Cavitation Prevention
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Solution Overview
Problem
Conventional oil pumps experience cavitation due to a sudden increase in flow passage area at the end of the partitioning section, which can lead to reduced pump lifetime.
Innovation Solution
The oil pump design includes a taper surface on an extension portion adjacent to the discharge groove portions, which moderates the increase in flow passage area, preventing cavitation and extending the pump's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discharge groove portions are formed to become gradually deeper along the oil flow direction, then flow passage area increases gradually and cavitation is suppressed, but the flow passage area still increases suddenly at the end of the partitioning section causing cavitation
Solution Approach 1:
The discharge port is divided into multiple segments: discharge groove portions with varying depths and an extension portion with a taper surface. This segmentation allows each segment to control the flow passage area change in a specific way, preventing sudden increases that cause cavitation while maintaining a manageable housing structure.
Solution Approach 2:
The extension portion is added locally at the end of the partitioning section with a specific taper surface geometry. This local modification addresses the cavitation problem at the critical location without requiring complex changes to the entire housing structure, thus improving reliability while minimizing device complexity.
2Productivity
If the flow passage area increases suddenly at the end of the partitioning section, then oil discharge efficiency is improved, but cavitation occurs reducing pump lifetime
Solution Approach 1:
The discharge groove portions are designed with varying depths along the oil flow direction, creating a dynamic flow passage area that increases gradually. The extension portion with taper surface further controls this dynamic change, ensuring smooth transition that prevents cavitation while maintaining discharge efficiency.
Solution Approach 2:
The geometry parameters of the discharge port are carefully controlled: the discharge groove portions have gradually increasing depth, and the extension portion has a specific taper angle. These parameter changes ensure the flow passage area increases moderately rather than suddenly, preventing cavitation while maintaining productivity.
3Stability of the object's composition
If discharge groove portions are formed with gradual depth increase, then sudden change of oil flow rate is suppressed, but flow passage area still increases at partitioning section end
Solution Approach 1:
The extension portion with taper surface is added in advance at the end of the partitioning section to preemptively control the flow passage area increase. This preliminary structural addition ensures that even when oil reaches this location, the area increase remains moderate, preventing cavitation before it can occur.
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 moderate change in flow passage area and flow rate reduces the occurrence of cavitation, thereby prolonging the oil pump's lifetime and ensuring stable operation.
Implementation Method 1
The sudden increase in the flow passage area at this position would cause a cavitation in the housing
Data Source
AI summary
A housing of an oil pump includes a suction port, a discharge port, and a partitioning section formed to partition the suction port and the discharge port. The discharge port has discharge groove portions each formed in a groove shape so as to introduce oil from the partitioning section, and an extension portion formed adjacent to the discharge groove portions and extending continuously from an end of the partitioning section. The extension portion has a taper surface extending from an end of an upper surface of the partitioning section to form a downward slope.