Bearings – Rotary bearing – Antifriction bearing
Patent
1998-11-12
2000-07-11
Hannon, Thomas R.
Bearings
Rotary bearing
Antifriction bearing
384462, 123195R, F16C 3366, F02F 700
Patent
active
060862602
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The subject invention refers to a crankshaft bearing system for an internal combustion engine.
BACKGROUND OF THE INVENTION
According to tradition internal combustion engines have crankshaft bearings, which are lubricated from the crankcase, for instance by oil-splash lubrication. Regarding crankcase scavenged engines the bearings are usually lubricated by the fuel-oil-mixture in the crankcase. The crankcase seals are located outside the bearings. This means that the bearings are subjected to dirt and residual combustion deposits which could shorten the lifetime. Also, the design of the bearings can affect the crankshaft's mechanical stability regarding bending vibrations. High-speed engines, such as two-stroke engines for chainsaws etc., can achieve, in point of bending vibrations, a critical range of speed. Regarding crankcase scavenged engines also the crankcase compression is affected by the design of the bearings and seals, and consequently the engine power.
PURPOSE OF THE INVENTION
The purpose of the subject invention is to substantially reduce the above outlined problems, and to achieve advantages in many respects.
SUMMARY OF THE INVENTION
The above mentioned purpose is achieved in that the crankshaft bearing system in accordance with the invention having the characteristics appearing from the appended claims.
The crankshaft bearing system in accordance with the invention is thus essentially characterized in that the engine's crankshaft is mounted in permanentely lubricated sealed bearings, usually ball bearings, and in that the engine's crankcase. seals are located inside each bearing, i.e. between the bearing and the crankshaft assembly with piston rod and counterweights. On a conventional crankshaft the seals are instead located outside each bearing. The new location inside the bearing results in many advantages. The crankshaft becomes stiffer and its harmonic frequency of bending will increase, and in this manner comes more far away from the range of engine speed. The crankcase compression will increase. The bearings are sealed and permanentely lubricated, usually by grease lubrication. Hereby the bearings will not be subjected to dirt or combustion deposits, which could shorten the lifetime. Owing to this the lifetime will be longer, and/or smaller and lighter bearings can be used. These and other characteristic features and advantages of the invention Will become more apparent from the following detailed description of various embodiments with the support of the annexed drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in closer detail in the following by way of various embodiments thereof with reference to the accompanying drawing, in which the same numbers in the different figures state one another's corresponding parts.
FIG. 1 illustrates schematically a crankshaft bearing in accordance with the invention seen from the side.
FIG. 2 illustrates enlarged a part of the crankshaft, according to FIG. 1, with bearing and crankshaft seal as well as a draining duct.
In FIG. 1 numeral 1 designates a crankshaft bearing system or a crankshaft arrangement in accordance with the invention. A crankshaft 15 is mounted in two roller bearings 2, 3, usually ball bearings. The engine's crankcase seals 4, 5 are located inside each bearing 2, 3, i.e. between the bearing and the crankshaft assembly 6 with piston rod 7 and counterweights 8, 9. The design of the crankshaft assembly is entirely conventional and will therefore not be further described.
FIG. 2 shows a partial enlargement of the crankshaft 15 and the bearing 2. As appears from the figure the bearing 2 is externally enclosed in a bearing holder 10. The bearing holder 10 comprises two parts, one inner solid part 16 and one outer elastic part 17. The solid part 16 is usually composed of a metallic part, usually a stamped tin cup. It has an inner diameter of a size adapted to give a suitable grip towards the bearing 2. The solid part 16 also goes down along the side of the bearing. This is advantageous
REFERENCES:
patent: 3149890 (1964-09-01), Selby
patent: 3195965 (1965-07-01), Van Dorn
patent: 4429924 (1984-02-01), Franz et al.
patent: 4968157 (1990-11-01), Chiba
patent: 5441019 (1995-08-01), Sayer et al.
Aktiebolaget Electrolux
Hannon Thomas R.
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