A truck vacuum pump works by creating a low-pressure environment to assist systems like power brakes and other vacuum-operated components. It essentially sucks air out of the vacuum system.
Here's a breakdown of the process:
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Positive Displacement: The pump employs a positive displacement mechanism. This means it traps a fixed volume of air and physically moves it from the vacuum system.
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Air Removal: The pump draws air from the connected vacuum system. This action reduces the pressure within the system, creating a vacuum.
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Pressure Generation: These pumps typically generate a negative pressure (vacuum) ranging from 750 to 850 mbar (approximately 10 to 12 psi).
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Discharge: The air that's been removed from the vacuum system is then routed through the crankcase ventilation system.
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Integration with Air Intake: Finally, the air is directed into the engine's air intake system, where it is combusted along with the regular air/fuel mixture.
In short, the vacuum pump uses mechanical action to pull air out of the vacuum system, creating the necessary low pressure, and then redirects the extracted air into the engine's intake for combustion.
