Vehicle Vacuum Pump Oil Outlet Positioning to Reduce Noise
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Solution Overview
Problem
Conventional vehicle vacuum pumps experience operation noise and pressure pulsation due to lubricant discharge, leading to discomfort for drivers and passengers, especially with increased usage of vacuum-powered devices.
Innovation Solution
A vacuum pump design featuring an oil outlet positioned above the center of the space to prevent lubricant backflow, combined with a side groove and vent groove to manage pressure and noise, ensuring smooth lubricant discharge and reduced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the oil outlet is positioned at a lower position to facilitate lubricant discharge, then lubricant discharge is improved, but lubricant backflow into the space occurs due to gravity, causing pressure pulsation and noise
Solution Approach 1:
The patent inverts the conventional oil outlet positioning by placing it at the upper position of the space rather than the lower position. This inversion prevents lubricant backflow into the space by utilizing gravity to keep discharged lubricant outside the space, thereby eliminating pressure pulsation and operation noise while maintaining effective lubricant discharge
2Object-generated harmful factors
If the oil outlet is positioned above the center of the space to prevent lubricant backflow, then operation noise is reduced, but lubricant discharge efficiency may be compromised
Solution Approach 1:
The patent introduces a discharge valve as an intermediary component at the upper oil outlet position. This valve mediates between the need to prevent lubricant backflow (by positioning the outlet above the center) and the need to maintain discharge efficiency, ensuring that lubricant is discharged effectively without backflowing into the space
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 effectively reduces operation noise and vibration by preventing lubricant backflow and managing pressure pulsation, enhancing the operational comfort and reducing noise levels during vehicle vacuum pump operation.
Implementation Method 1
an oil outlet passing through the pump body and formed at a predetermined height above a lower limit of the space such that, when lubricant having been introduced into the space is discharged in a pressurized state by the vane, the lubricant is not reintroduced back into the space by gravity
Implementation Method 2
generates vacuum pressure in such a way to compress air within the space and discharge the compressed air to the outside while the vane rotates in an eccentric state
Data Source
AI summary
A vacuum pump of a vehicle for reducing operation noise may include a rotor rotating in a space defined by a housing formed in a pump body at an eccentric position relative to a center of the space, a vane installed to the rotor to rotate eccentrically in the space, and an oil outlet passing through the pump body and formed at a predetermined height above a lower limit of the space such that, when lubricant in the space is discharged in a pressurized state by the vane, the lubricant is not reintroduced back into the space by gravity.