FIELD OF INVENTION
This invention relates to a connecting rod for internal combustion engine of
vehicle.
PRIOR ART
A connecting rod is customarily available with a vehicle, big end of which is
connected with crankshaft of the engine and small end of which is provided in
connection with a piston by means of a piston pin. The piston pin is lubricated
with oil through the hole on the small end.
A known connecting rod as shown in fig. 1 comprising a hole ( 1) on one side of
big end (2) of the rod, wherein the side facing thrust side of piston. Crank pin
(C) of the crankshaft (S) is also provided with a hole (H) as shown in fig. 2. So
that, both the holes are aligned during rotation of the shaft to lubricate piston
skirt and piston rings at thrust side by oil therethrough. This helps in
lubrication & reduction of friction between cylinder bore and piston assembly
at thrust side.
Another provision is known to have been made in the art, which is shown in
fig. 3. A hole (H) exists in the engine block (E), which is attached to a piston jet
to cool the piston crown by continuously hitting oil jet (J) under piston crown.
This results in reduction of piston temperature, which helps in reduction of
knocking in engine.
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2 9 APR 2014
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Now, reference may be made to the following prior arts:-
A known art discloses a connecting rod, in which both sides of a joint between
a big end of a connecting rod and crank shaft are provided with oil grooves.
In this, groove is provided on side surface of the big end for lubrication and
also for weight reduction.
Another prior art is directed to an engine connecting rod assembly. An upper
oil collecting groove is formed on the inner wall of a first arc groove at the big
end of a connecting rod. A first oil inlet is formed on an upper bearing bush,
and the first oil inlet penetrates through the inner and outer surfaces of the
upper bearing bush. A lower oil collecting groove is formed on the inner wall of
a second arc groove of a connecting rod cover, a second oil inlet is formed on a
lower bearing bush, and the second oil inlet penetrates through the inner and
outer surfaces of the lower bearing bush; and the lower oil collecting groove is
communicated with an oil inlet groove formed on the top of an oil throwing
block through an oil passage.
Here, an additional member having spoon type profile is connected to big end
for splashing oil on the big end for its lubrication.
CN202280728U:- It discloses an engine connecting rod, which comprises a rod
body, a large connecting rod head matched with an engine crankshaft and a
small connecting rod head matched with a piston, wherein an oil hole for
collecting lubrication oil is arranged on the small connecting rod head. The oil
hole can be used for collecting engine oil splashed from the large connecting
rod head to lubricate the small connecting rod head.
2 9 APR 2014
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It is provided for lubrication of pm disposed through small end of the
connecting rod. For the same, two holes are provided on the small end, which
are defined.
However, no such technology is currently available, which can lubricate the
thrust side and at the same time cool under piston crown on anti thrust side.
Hence, the present invention proposes a connecting rod for internal
combustion engine of vehicle, which can fulfill the above requirements.
OBJECTS OF THE INVENTION
Primary object of the present invention 1s to provide a connecting rod for
internal combustion engme of vehicle which overcomes disadvantages
associated with the prior art.
Another object of the present invention is to provide a connecting rod for
internal combustion engine of vehicle which reduces knocking in engine.
Further object of the present invention is to provide a connecting rod for
internal combustion engine of vehicle which is simple in construction.
Yet another object of the present invention is to provide a connecting rod for
internal combustion engine of vehicle which is reliable and efficient.
Yet another further object of the present invention is to provide a connecting
rod for internal combustion engine of vehicle which helps to lubricate piston
skirt and cylinder bore at thrust side and also helps to cool piston crown.
SUMMARY OF THE INVENTION
According to this invention, there 1s provided a connecting rod for internal
combustion engine of vehicle, small end of which is connected to piston pin of
piston and big end of which is connected to crankshaft of engine block,
wherein the big end is provided with a hole on one side facing thrust side of
0.
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2 9 APR 2014
ORIGINAL
piston for lubrication and another hole on other side directing under piston
crown for cooling piston crown.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent from
the ensuing description when read in conjunction with the accompanying
drawings and wherein:
Fig. 1 shows: conventional connecting rod.
Fig.2 shows: crank pin of crankshaft according to prior art.
Fig. 3 shows: engine block with hole to cool piston crown in accordance with
prior art.
Fig. 4 shows: novel connecting rod in accordance with the present invention.
Fig. 5 shows: assembly of engine block, piston, connecting rod and crank of
present invention highlighting oil jet.
Fig. 6 shows: piston.
DETAIL DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE
ACCOMPANYING DRAWINGS
This invention discloses a connecting rod for internal combustion engine of
vehicle. Now, reference may be made to fig. 4 and 5 indicating connecting rod
(R) and engine block, piston, connecting rod, crank assembly of invention
respectively. The connecting rod (R), small end (1) of which is connected to
piston pin of piston (P) and big end (2) of which is connected to crankshaft
(C) of engine block (E), wherein the big end is provided with a hole (3) on one
side facing thrust side of piston for lubrication and another hole (4) on other
side for cooling piston crown.
0 2 9 APR 2014
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The hole (3) on the thrust side is aligned with the hole in the crank pin of the
crankshaft during its rotation in order to lubricate the piston skirt (Pl) as
shown in fig. 6 and cylinder bore (B) to reduce friction therebetween at thrust
side.
The alignment takes place once per revolution of the crankshaft when the oil
hole in crank pin coincides with the oil hole in the rod.
In addition to the above, another hole (4) on other side of big end is aligned
with the hole in the crank pin of crank shaft during its rotation to cool piston
crown by the oil jet (J). The oil jet (J) from connecting rod directly hits the
piston under crown.
The oil jet hits under crown of piston once per revolution of crankshaft when
the crank oil hole coincides with the connecting rod oil hole on anti thrust side.
Oil jet hitting under crown of piston tends to cool the piston crown, thereby
bringing down temperature of piston crown. This helps in reducing knocking in
engme.
Hence, the invention serves the dual purpose of lubrication and cooling, which
distinguishes it from the known art.
Advantageous Features
Lubrication of piston skirt and cylinder bore to reduce friction
therebetween at thrust side.
Cooling of piston crown, thereby bringing down temperature of piston
crown.
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Reduction of knocking in engine.
Serves dual purpose of lubrication and cooling.
Improvement in engine operation efficiency.
2 9 APR 2014
It is to be noted that the present invention is susceptible to modifications,
adaptations and changes by those skilled in the art. Such variant embodiments
employing the concepts and features of this invention are intended to be within
the scope of the present invention, which is further set forth under the
following claims:-

WE CLAIM:-
1. A connecting rod for internal combustion engine of vehicle, small end of
which is connected to piston pin of piston and big end of which is
connected to crankshaft of engine block, wherein the big end is provided
with a hole on one side facing thrust side of piston for lubrication and
another hole on other side directing towards anti thrust side for cooling
piston crown.
2. A connecting rod as claimed in claim 1, wherein the hole on the thrust
side is aligned with the hole in the crank pin of the crankshaft during its
rotation in order to lubricate the piston skirt and cylinder bore to reduce
friction therebetween at thrust side.
3. A connecting rod as claimed in claim 2, wherein the alignment takes
place once per revolution of the crankshaft when the oil hole in crank pin
coincides with the oil hole in the rod.
4. A connecting rod as claimed in any of the preceding claims, wherein
another hole on other side of big end is aligned with the hole in the crank
pin of crank shaft during its rotation to cool piston crown by the oil jet.
5. A connecting rod as claimed in claim 4, wherein the oil jet hits under
crown of piston once per revolution of crankshaft when the crank oil hole
coincides with the connecting rod oil hole on anti thrust side.
6. A connecting rod as claimed in any of the preceding claims, is associated
with the advantageous features such as herein described.
7. A connecting rod for internal combustion engine of vehicle substantially
as herein described with reference to the accompanying.drawings.