Internal-combustion engines – Lubricators – Crankcase – pressure control
Reexamination Certificate
2000-09-01
2001-11-20
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Lubricators
Crankcase, pressure control
Reexamination Certificate
active
06318333
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an arrangement for various components of an internal combustion engine.
2. Description of the Relevant Art
An engine, such as a transverse engine provided with a crankshaft facing in the direction of travel of the vehicle, is shown in the background art of Japanese Patent Laid-open No. Hei. 7-195949. In the engine of the background art, a camshaft, a balancer shaft and an oil pump are arranged vertically elevated one from the other on one side of the crankshaft. A transmission is arranged on the other side of the crankshaft. The arrangement of the engine components, looking from the front, is such that a balancer and the camshaft are arranged on an outer side of the crankshaft. An oil pump is arranged close to one of either the balancer or the camshaft. Further, the oil pump is arranged on the same side of the crankshaft as a chain for driving the camshaft.
In the background art, the camshaft and the suplementary parts for operation of a valve mechanism and parts of the lubrication system are arranged on one side of the crankshaft, near a chain for driving the camshaft and the oil pump. In order to adopt a dry sump structure with this arrangement, it is necessary to plumb an oil pipe to the periphery of the oil pump. Further, it is necessary to increase the size of the case.
In the case where a dry sump structure is adopted while suppressing the overall height of the engine, it is necessary to provide a large internal oil tank arrangement space, which means it becomes necessary to provide a separate oil tank. If this is done then the oil tank, and oil cooler and the engine must be joined together using a plurality of expensive and heavy hoses, thus increasing the number of parts, the costs and the weight.
SUMMARY OF THE INVENTION
It is an object of the present invention to address one or more of the drawbacks associated with the background art.
These and other objects are accomplished by an internal combustion engine comprising: a crankcase; an oil tank inside said crankcase, an oil pump including a feed pump and a scavenge pump, said feed pump for supplying lubricating oil inside said oil tank to respective components of the internal combustion engine, and said scavenge pump for returning lubricating oil that has accumulated in a bottom of said crankcase to said oil tank; a crankshaft disposed in said crankcase; and a camshaft having a driven section attached thereto to be driven to rotate by rotation of said crankshaft, wherein said camshaft and said oil pump are arranged on one of a left side or a right side of said crankshaft and a transmission is arranged on the other of said left side or said right side of said crankshaft.
Further, these and other objects are accomplished by an internal combustion engine comprising: a crankcase; an oil tank inside said crankcase; an oil pump including a feed pump and a scavenge pump, said feed pump for supplying lubricating oil inside said oil tank to respective components of the internal combustion engine, and said scavenge pump for returning lubricating oil that has accumulated in a bottom of said crankcase to said oil tank; a crankshaft disposed in said crankcase; a camshaft having a driven section attached thereto to be driven to rotate by rotation of said crankshaft; and a balancer shaft having a balancer thereon, with said balancer shaft being parallel to said camshaft, wherein said driven section of said camshaft and said oil pump are respectively arranged on opposite sides of said balancer of said balancer shaft.
Moreover, these and other objects are accomplished by a combination comprising: a vehicle; and an internal combustion engine including: a crankcase; an oil tank inside said crankcase; an oil pump including a feed pump and a scavenge pump, said feed pump for supplying lubricating oil inside said oil tank to respective components of the internal combustion engine, and said scavenge pump for returning lubricating oil that has accumulated in a bottom of said crankcase to said oil tank; a crankshaft disposed in said crankcase; a camshaft having a driven section attached thereto to be driven to rotate by rotation of said crankshaft; and a balancer shaft having a balancer thereon, with said balancer shaft being parallel to said camshaft, wherein said camshaft, said balancer shaft, and said oil pump are arranged on one of a left side or a right side of said crankshaft and a transmission is arranged on the other of said left side or said right side of said crankshaft, and wherein said driven section of said camshaft and said oil pump are respectively arranged on opposite sides of said balancer of said balancer shaft.
Other objects and further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 5461940 (1995-10-01), Morita
patent: 5887564 (1999-03-01), Kawamoto
patent: 5899186 (1999-05-01), Kawamoto
patent: 6205971 (2001-03-01), Inumaru et al.
patent: 6230680 (2000-05-01), Pirone
Narita Satoru
Shichinohe Takashi
Yasuda Hidenori
Birch & Stewart Kolasch & Birch, LLP
Honda Giken Kogyo Kabushiki Kaisha
McMahon Marguerite
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