Cylinder liner with oil pocket

Details Cylinder liner with oil pocket Cylinder liner with oil pocket

1999-12-06

2001-07-03

McMahon, Marguerite (Department: 3747)

Internal-combustion engines

Particular piston and enclosing cylinder construction

Cylinder detail

Reexamination Certificate

active

06253724

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a cylinder liner mounted in cylinder of engine, and more specifically to a cylinder liner provided with oil pocket including a plurality of recesses which are filled with lubrication oil.
BACKGROUND OF THE INVENTION
In conventional industrial engine system, a cylinder liner is mounted in the cylinder of engine and adapted to prevent inner surface of the cylinder from wearing caused by a piston reciprocating in the cylinder. The inner surface of the cylinder liner which contacts with the piston is smoothly honed by honing machine. The inner surface of the cylinder liner is provided with a plurality of parallel recess lines which are filled with lubrication oil for lubricating interface between the inner surface of the cylinder and the outer surface of the piston reciprocating in the cylinder liner. All recess lines are intersected to form a plurality of diamond shapes. Generally, each of parallel recess lines is hatched by a hatch angle cross honing process, and cross angle of the recess lines which are intersected is 30 to 60 degrees. As the recess lines of the cylinder liner are filled with lubrication oil, the frictional resistance between the piston and the cylinder liner is reduced when the piston is reciprocated in the cylinder.
However, because the inner surface of the cylinder liner which is provided with a plurality of diamond-shaped recess lines has relatively low roughness of 0.8 to 2.2, the recess lines are easily worn out. Additionally, as the recess lines are lowered and the edges of the recess lines are sharpened, a plurality of diamond-shaped surfaces formed by the diamond recess lines are easily worn by the piston which is reciprocated in the cylinder liner.
As the recess lines is shallower and the lubrication oil is reduced, the lubrication oil is not sufficiently supplied and distributed onto the inner surface of the cylinder liner. Therefore, the piston is not smoothly reciprocated in the cylinder, the engine performance is not good, and also the cylinder liner has a short life time.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a cylinder liner with oil pocket which can sufficiently supply lubrication oil onto inner surface of the cylinder liner.
It is another object of the present invention to provide a cylinder liner with oil pocket that can be put in use for a prolonged period of time without premature wearing.
In a preferred embodiment of the invention, there is provided a cylinder liner with oil pocket which has a plurality of recesses formed on inner surface of the cylinder liner in which a piston is reciprocated. Each of recesses is reverse-dotted on the inner surface of the cylinder liner. Each of the recesses forms a plurality of recess rows which are arranged in the diagonal direction.
In the cylinder liner with oil pocket of the present invention, each of recesses is reverse-dotted on the inner surface of the cylinder liner, while the inner surface of the cylinder liner which contacts with the piston has a wide area of surface and the anti-wearing of the inner surface of the cylinder liner is increased. As the lubrication oil is sufficiently received and maintained in each of recesses, the lubrication performance between the piston and the cylinder liner and the engine performance are improved. Also, chips and/or impurities which may be generated in actuating of the engine are received in each of recesses, so that the premature wear of the cylinder liner and the piston can be prevented.
Additionally, the oil pocket and the process for forming the oil pocket are simple, and thus the cylinder liner is manufactured at relatively low cost.


REFERENCES:
patent: 3749072 (1973-07-01), Schweikher
patent: 4196547 (1980-04-01), Keske
patent: 4258084 (1981-03-01), Hayden, Sr.
patent: 5357921 (1994-10-01), Katoh et al.
patent: 5701861 (1997-12-01), Hegemier et al.
patent: 5815789 (1998-09-01), Akpan
patent: 5887558 (1999-03-01), Kampichler et al.
patent: 5931038 (1999-08-01), Higashi
patent: 6012973 (2000-01-01), Nagel
patent: 6095690 (2000-08-01), Niegel et al.

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