This invention relates generally to zero turning radius (“ZTR”) mowers and specifically to an oil extension kit for ZTR mowers.
ZTR mowers have two cylinder air-cooled internal combustion engines with displacements of about 500 cc up to 1000 cc. These engines typically hold an oil volume of about 1.5 L to about 2.5 L and require oil changes about every 100 hours. Commercial mowing operations use their ZTR mowers every day and must change the oil at least every month, which is unproductive down time. A ZTR mower oil extension kit is needed to extend the time interval between oil changes. A ZTR mower oil extension kit is needed to retrofit different engines on ZTR mowers, and that is low in cost.
U.S. Pat. No. 9,903,241 for Small Air-Cooled Engine Assembly with Dry Sump Lubrication System shows a system designed to extend time between oil changes. However, the system is only for specific dry sump engines, cannot be installed as a kit on ZTR mowers, and has costly additional components.
In the past, various systems have been proposed to automatically replenish engine oil when certain conditions are met, such as low oil level, high engine temperature, poor oil quality, prolonged engine usage, or actuation of an oil change switch. For example, U.S. Pat. No. 2,792,912 for Automatic Control System for Lubricant Supply, U.S. Pat. No. 3,447,636 for Automatic Oil Exchanging System, U.S. Pat. No. 4,674,456 for Oil-Changing System for an Internal Combustion Engine, U.S. Pat. No. 4,869,346 for Automatic Crankcase Oil Change and Makeup System, U.S. Pat. No. 5,238,085 for Engine Oil Makeup and Extended Operation Oil Exchange System, U.S. Pat. No. 5,701,862 for Method and Apparatus for Replenishing the Lubricating Oil of an Internal Combustion Engine, and U.S. Pat. No. 5,964,318 for System for Maintaining the Quality and Level of Lubricant in an Engine relate to systems that provide fresh oil from a reservoir to a wet sump. However, each of these systems is costly and complex, and cannot be installed as a retrofit kit on a ZTR mower.
A zero turning radius mower oil extension kit includes a supplemental oil tank mounted below an engine sump of a rear mounted zero turning radius mower engine. Oil from the engine sump completely fills the supplemental oil tank while the engine is running. An overflow of oil continuously flows from the supplemental oil tank back to the engine sump.
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Having described the preferred embodiments, it will become apparent that various modifications can be made without departing from the scope of the invention as defined in the accompanying claims.
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Number | Date | Country | |
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20210381408 A1 | Dec 2021 | US |