Lubrication – Lubricators – Lubricant heating and/or cooling device
Reexamination Certificate
2000-09-28
2004-02-17
Fenstermacher, David (Department: 3682)
Lubrication
Lubricators
Lubricant heating and/or cooling device
C184S106000, C165S051000, C123S1960AB
Reexamination Certificate
active
06691831
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a splashing oil lubrication type internal combustion engine and more particularly to a splashing oil lubrication type internal combustion engine capable of reducing temperature of engine oil by raising a cooling efficiency of a crankcase.
2. Background Art
An example of the splashing oil lubrication type internal combustion engine disclosed in Japanese Patent Application Laid-open No. Toku-Kai-Hei 10-280932 has a method of splashing oil stored below in a crankcase by an oil dipper equipped with a connecting rod and another example of the engine disclosed in Japanese Patent Application Laid-open No. Toku-Kai-Hei 8-177441 has a method of splashing oil by an oil dipper rotating in an interlocking relationship with a crankshaft.
FIG. 4
is a front sectional view of a splashing oil lubrication type engine according to the prior art. An engine
1
has a cylinder block
2
integrally formed with a crankcase
4
and including a cylinder
3
. The crank case
4
comprises a bottom section
11
, a rear wall section
12
extending upwardly from the rear (back side of the drawing) end of the bottom section
11
, side wall sections
13
,
14
extending upwardly from the left and right end of the bottom section
11
respectively and connecting with the left and right ends of the rear wall section
12
respectively, a ceiling section
15
closing upper ends of the rear wall section
12
, the side wall sections
13
,
14
, and a crank chamber
16
enclosed by these bottom section
11
, side wall sections
13
,
14
, ceiling section
15
and a crank case cover (not shown) formed on the front side of the crank case
4
.
A crank shaft
18
extending in an orthogonal direction with respect to the drawing is rotatably supported at the rear end thereof by a bearing
18
formed at a specified vertical position of the rear wall section
12
and supported at the front end thereof by a bearing (not shown) provided at the same vertical position of the crank case cover. A crank pulley
19
is coaxially secured to the front end of the crankshaft
18
. The crank pulley
19
has teeth on the periphery surface thereof to mesh with teeth of a timing belt
26
wound around the crank pulley
19
and a camshaft pulley
25
which will be described hereinafter.
The cylinder
3
of the cylinder block
2
has a cylinder axis
5
slanted with respect to the vertical direction of the engine
1
so that the axis
5
extends above diagonally from the upper portion of the right wall section
14
of the crankcase
4
. The cylinder
3
is connected at the upper end thereof with a cylinder head
21
having a valve train mechanism
22
. Further, at the front of the cylinder
3
, there is provided a belt chamber
23
communicating between the crank chamber
16
and a valve train chamber of the cylinder head
21
. The valve train mechanism
22
has a camshaft
24
extending in the same direction as the crankshaft
18
. The camshaft pulley
25
is coaxially secured to the front end of the camshaft
24
and has teeth meshing with the teeth of the timing belt
26
.
The timing belt
26
is constituted by fabric core material such as carcass, lubber and synthetic resin and has equally spaced step-like teeth formed on the inner periphery surface of the belt. Further, the timing belt
26
is housed in the belt chamber
23
and wound around the crank pulley
19
and the cam pulley
25
so as to rotate the cam shaft
24
in an interlocking relationship with the rotation of the crankshaft
18
.
However, the engine according to the prior art as described above is not designed so as to reduce temperature inside of the crank chamber
16
or to reduce temperature of engine oil splashed in the crank chamber
16
or engine oil stored in the lower part of the crank chamber
16
. Accordingly, in case where temperature of the crank chamber
16
becomes high, temperature of engine oil is also increased and as a result its lubrication characteristic goes down.
Further, there is a fear that splashed engine oil in high temperature sticks to the timing belt
26
and as a result heat deteriorates the timing belt
26
.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a splashing oil lubrication type internal combustion engine capable of reducing temperature of the crank chamber
16
and lowering the temperature of engine oil. Particularly, as well known, the lowering of engine oil is very important for maintain the lubrication characteristic of engine oil in good condition, that is, for preventing the lubrication performance for lubricating miscellaneous components, such as a crankshaft, a connecting rod, intake and exhaust valves and a valve driving mechanism, from being degraded. It is another object of the present invention to provide a splashing oil lubrication type internal combustion engine in which a timing belt of the engine can be protected from deterioration due to heat received from engine oil.
In accordance with a first aspect of the invention, the object is achieved by absorbing heat in a crank chamber as much as possible. For that purpose, the engine comprises an oil splashing means for splashing engine oil in the crank chamber in a radial direction of a crankshaft and for forming a flow of splashing oil around the crankshaft and a plurality of heat receiving ribs projected inwardly from the inner wall surface of the crankcase so as to absorb heat in the crank chamber.
A second aspect of the present invention is to provide an engine capable of discharging heat the crankcase as much as possible. For that purpose, the engine includes a plurality of heat radiating ribs projected outwardly from the outer wall surface of the crankcase so as to discharge heat in the crank chamber out of the engine.
Further, a third aspect of the present invention is to provide heat receiving ribs on the inner wall surface of the crankcase and at the same time to provide heat radiating ribs on the outer wall surface of the crankcase so as to further enhance the heat discharge from the crankcase.
REFERENCES:
patent: 1365438 (1921-01-01), Adamson
patent: 1583099 (1926-05-01), Rayfield
patent: 1950034 (1934-03-01), Mulford et al.
patent: 2577188 (1951-12-01), Hall
patent: 2706469 (1955-04-01), Nallinger
patent: 2862656 (1958-12-01), Kadison
patent: 3487818 (1970-01-01), Dineen
patent: 3817354 (1974-06-01), Meiners
patent: 5333575 (1994-08-01), Olmr
patent: 5755194 (1998-05-01), Moorman et al.
patent: 6039020 (2000-03-01), Kawamoto et al.
patent: 481584 (1992-04-01), None
patent: 8177441 (1996-07-01), None
patent: 10280932 (1998-10-01), None
Farber Martin A.
Fenstermacher David
Fuji Jukogyo Kabushiki Kaisha
LandOfFree
Splashing oil lubrication type internal combustion engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Splashing oil lubrication type internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Splashing oil lubrication type internal combustion engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3351193