Vane Pump Cam Ring Fluid Routing for Cavitation Suppression
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Solution Overview
Problem
Conventional vane pumps experience cavitation issues due to increased suction negative pressure when the amount of surplus oil from the hydraulic pressure supply circuit varies, leading to inefficient oil flow into the pump chamber.
Innovation Solution
The vane pump design includes a first and second communication passage along the outer periphery of the cam ring, guiding fluid that has not flowed into the first suction port to the second suction port, and vice versa, with rectifying portions to manage fluid flow and prevent cavitation by optimizing fluid distribution during changes in hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the communication oil passage is disposed on the inner peripheral side of the cam ring, then oil can flow between the main-side suction port and sub-side suction port, but the suction negative pressure increases and cavitation occurs
Solution Approach 1:
The patent moves the communication oil passage from the inner peripheral side to the outer peripheral side of the cam ring, changing the spatial dimension of the passage location. This dimensional change allows the passage to be positioned where it does not interfere with the suction ports, thereby reducing suction negative pressure and preventing cavitation while still enabling oil flow between ports.
Solution Approach 2:
The rectifying portion acts as an intermediary component that guides and regulates oil flow from the second inflow passage. It ensures that excess oil is properly directed through the communication passage without creating harmful pressure fluctuations, mediating between the inflow passage and suction ports to prevent cavitation.
2Quantity of substance
If the amount of surplus oil from the hydraulic pressure supply circuit increases, then more oil flows into the main-side suction inlet, but oil flow from main-side suction port to sub-side suction port hinders the synchronized oil flow
Solution Approach 1:
The patent creates a dynamic oil flow system where the communication passage on the outer peripheral side allows flexible oil distribution. When surplus oil increases, the rectifying portion and communication passage dynamically adjust to guide excess oil away from the suction ports, preventing flow hindrance and maintaining efficient operation under varying flow conditions.
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 design effectively suppresses cavitation by ensuring consistent oil flow into the pump chamber, improving cavitation characteristics regardless of the hydraulic oil flow rate from the hydraulic control device.
Implementation Method 1
a first communication passage that extends along an outer periphery of the cam ring and that guides a fluid that has not flowed into the first suction port from the first inflow passage to the second suction port
Data Source
AI summary
A vane pump that includes a first communication passage that extends along an outer periphery of the cam ring and that guides a fluid that has not flowed into the first suction port from the first inflow passage to the second suction port; a second communication passage that extends along the outer periphery of the cam ring on an opposite side of the first communication passage with respect to the rotor and that guides a fluid that has not flowed into the second suction port from the second inflow passage to the first suction port; and a rectifying portion that guides the fluid from the second inflow passage so that the fluid flows into the second suction port along the outer periphery of the cam ring.