ENGINE LUBRICATION SYSTEMS, LUBRICATION FLUID CIRCULATION SYSTEMS, AND METHODS FOR REGULATING FLUID PRESSURE
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United States of America Patent
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Issued Date -
Mar 7, 2024
app pub date -
Oct 30, 2023
filing date -
May 4, 2021
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Abstract
A lubrication system for an internal combustion engine includes a fluid flow control device at an outlet side of the pump that regulates pressure conditions at the outlet side of the pump upstream of the lubrication circuit in the engine. The fluid flow control device is located in a recirculation path, and opens in response to a fluid pressure at the outlet of the pump exceeding a first threshold to allow the fluid to pass from the outlet side of the pump back to an inlet side of the pump. The recirculation path includes a tuning device that maintains the fluid pressure at engine speeds above the first threshold. In response to engine speeds above a second threshold, the tuning device restricts fluid flow in the recirculation path so that the fluid pressure in the fluid flow path increases.
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