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US 6,681,737 B2Granted
Engine lubrication system
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsAkihisa Shinoda, Hiroshi Moriyama
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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsAkihisa Shinoda, Hiroshi Moriyama
Estimating the term…
An engine lubrication system has an arrangement in which the base of a crankcase is used to form an oil reservoir, and a part of an oil slinger that is driven by a crankshaft via a transmission system is immersed in the oil within the oil reservoir. An oil pump that is driven by the transmission system is immersed in the oil within the oil reservoir, and a discharge port of the oil pump communicates with a lubricating-oil passage within the crankshaft. It is thereby possible to provide an engine lubrication system based on a splash-type lubrication system while at the same time using a forced-type lubrication system, thus reducing the capacity of the oil pump and simplifying the drive system, and effectively suppressing an increase in the overall cost.
An engine lubrication system for lubricating the interior of an engine having a crankshaft, a crankcase supporting the crankshaft, and a transmission operably connected to the crankshaft, the engine lubrication system comprising a base of the crankcase forming an oil reservoir, a lubricating-oil passage within the crankshaft, an oil slinger driven by the crankshaft through the transmission, and an oil pump driven by the crankshaft through the transmission,
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Multi-cylinder engines: with cylinders in V, fan, or star arrangement
Pressure lubrication: using lubricating pumps
Pressure lubrication: lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways,…
Pressure lubrication: lubricating systems characterised by the provision therein of lubricant jetting means
Term ended 28 Apr 2022 (estimated)
1. Field of the Invention
The present invention relates to an engine lubrication system in which the base of a crankcase supporting a crankshaft forms an oil reservoir, a part of an oil slinger that is driven by the crankshaft via a transmission system is immersed in oil within the oil reservoir, and the interior of the engine is lubricated with splashed oil generated by rotation of the oil slinger.
2. Description of the Related Art
FIG. 1 is a longitudinal section side view of a vertical type engine equipped with a lubrication system of the present invention;
FIG. 2 is a cross section at line 2—2 in FIG. 1;
FIG. 3 is a cross section at line 3—3 in FIG. 1;
One embodiment of the present invention is explained below by reference to the appended drawings.
In FIGS. 1 to 3, a vertical type engine E includes a crankcase 2 supporting a vertically disposed crankshaft 1, and a pair of left and right banks Ba and Bb that extend in a V-shaped manner from a side wall of the crankcase 2. The crankcase 2 is formed from a crankcase main body 2a having an open lower face, and a cover 2b that is joined to the lower end of the crankcase main body 2a by a bolt 3. Upper and lower journals 1j and 1j′ of the crankshaft 1 are rotatably supported by a ball bearing 4 mounted in the top wall of the crankcase main body 2a and a bearing boss 5 formed on the cover 2b respectively. An upper oil seal 6 is provided outside the ball bearing 4, and a lower oil seal 7 is provided in an outer part on the inner circumference of the bearing boss 5.
Integrally formed on the cover 2b is a bracket 8 for fixing the engine to the frame of various types of work machine. The lower end of the crankshaft 1 that projects beneath the cover 2b forms the output section that drives the various types of work machines. Fixed to the upper end of the crankshaft 1 is a rotor 10r of a power generator 10 together with a cooling fan 11. A stator 10s of the power generator 10 is attached to the upper end face of the crankcase main body 2a.