JPH0968098A - Lubricating device of cylinder liner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the outflow of lubricating oil into a combustion chamber by fixing an oil receiving pan, whose lower end is opened downward and upper end is blocked up and which captures scattered oil from a top land clearance, to an upper part above a piston top surface at upper dead center time of an inside surface of a cylinder liner. SOLUTION: In an oil receiving pan 8 of a scattered oil which is composed of a heat resistant sheet metal material, its lower end is arranged so as to be positioned slightly above a piston top surface 3a at upper dead center time of a piston 3, and interference with the piston 3 is prevented. When an internal combustion engine having a cylinder liner is operated, lubricating oil 6 staying in a top land clearance 5 is scattered upward by inertia force by reciprocating motion of the piston 3. However, this scattered lubricating oil enters the oil receiving pan 8 through a lower end opening part 8c of the oil receiving pan 8 installed on a slidingly movable surface 1a of the cylinder liner, and sticks to these inside surfaces, or collides with the inside surface of the oil receiving pan 8, and is returned to the top land clearance 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder liner used for internal combustion engines, reciprocating compressors and the like.

[0002]

FIG. 4 shows an outline of a sliding portion between a piston and a cylinder liner of an internal combustion engine. In the drawing, reference numeral 01 denotes a cylinder liner, and 03 denotes a piston. The piston 03 reciprocates by sliding a plurality of piston rings 04 for combustion gas sealing fitted on the inner surface (sliding surface) of the cylinder liner 01. Be moved.
02 is a cylinder cover, and 020 is an exhaust valve. Lubricating oil is supplied to the inner surface of the cylinder liner 01 in order to prevent seizure and wear with the piston ring 04.

FIG. 5 shows the behavior of the lubricating oil 06 when the piston 03 is at the top dead center. In FIG. 5, the lubricating oil supplied from the oiling device (not shown) is stored in the top land clearance 05 which is a space defined by the uppermost piston ring 04, the cylinder liner 01, and the piston 03. Since the piston 03 reciprocates, the lubricating oil 06 existing in the top land clearance 05 also receives an acceleration α represented by the following equation.

Α = γω ² [cos θ + (cos 2θ / λ)] Here, θ: crank angle γ: crank radius ω: rotational angular velocity λ: connection ratio The acceleration: α is upward at the top dead center of the piston 03. Since the lubricating oil 06 is maximized, the lubricating oil 06 scatters into the combustion chamber 09 due to inertial force, and adheres to the piston upper surface 03a, the cylinder cover 02, and further to a portion of the cylinder liner 01 that does not slide on the piston ring 04. Therefore, the lubricating oil is not only used for lubricating the sliding portion between the cylinder liner 01 and the piston ring 04, which is the original purpose, but also evaporates due to a flame generated during combustion.

As a result, the lubricating oil consumption rate increases, which causes an increase in the operating cost of the engine. In addition, seizure and wear of the sliding contact portion between the cylinder liner and the piston ring due to insufficient lubricating oil on the sliding surface are caused. It causes increase.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the lubricating oil from flowing into the combustion chamber to reduce the lubricating oil consumption rate, and to reduce the lubricating oil on the sliding surface (inner surface) of the cylinder liner and the cylinder ring and the piston ring. To prevent the occurrence of seizure and increase in wear.

[0007]

Means for Solving the Problems The present invention is intended to solve the above problems, and a first means thereof is a reciprocating engine such as an internal combustion engine, in which the inner surface (sliding surface) of a cylinder liner is A cylinder characterized in that a lower end is opened downward and an upper end is closed and an oil pan for catching splashed oil from the topland clearance is fixed above the piston top surface at the time of top dead center. Located in the liner lubricator.

According to the above construction, even if the lubricating oil stored in the top land clearance of the piston is scattered toward the upper combustion chamber side due to its inertial force in the vicinity of the piston top dead center, the scattered oil is oil. The oil is caught by entering the oil pan from the lower opening of the pan, and is prevented from scattering upward.

According to a second aspect of the present invention, the oil pan is provided with an oil sump portion for accumulating scattered oil, one end of which is opened and the other end of which is opened to the outside. This is because an oil discharge passage for discharging the lubricating oil in the sump and a solenoid valve for opening and closing the oil discharge passage in conjunction with the rotation of the engine are additionally provided.

According to such a means, in addition to the above, the lubricating oil captured by the oil receiving tray can be collected outside through the drainage passage with the electromagnetic valve, so that the lubricating oil can be reused.
It is possible to reduce the operating cost of the engine. Also, since the above-mentioned oil discharge path is opened and closed by the solenoid valve that opens and closes in conjunction with the engine speed, it is possible to discharge the lubricating oil in the oil pan when the pressure in the combustion chamber, which is suitable for sucking and discharging the lubricating oil, is low. Therefore, the lubricating oil captured in the oil pan can be collected without waste.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a sectional view of an essential part of a cylinder liner sliding portion according to a first embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG.

In FIGS. 1 and 2, 1 is a cylinder liner, 2
Is a cylinder cover, 3 is a piston, and 4 is a piston ring. The piston 3 is reciprocated while the outer peripheral surface of the piston ring 4 is in sliding contact with the sliding surface (inner surface) of the cylinder liner 1. 9 is a combustion chamber. Reference numeral 8 denotes an oil pan for splashing oil, which is made of a heat-resistant sheet metal material, and has a lower end 8
It is installed so that a is located slightly above the piston top surface 3a at the time of top dead center of the piston 3 to prevent interference with the piston 3.

As shown in FIG. 2, the oil pan 8 is divided into a plurality of pieces in the circumferential direction of the cylinder liner 1, and each piece is fixed at its upper portion to the inner surface of the cylinder liner 1 with a bolt 10. There is. Further, the oil pan 8 is
As shown in FIG. 1, in the axial direction of the cylinder liner 1, it has an opening 8c on the lower side and is bent inward (center side of the cylinder liner) to form an oil holding recess 8b.

During operation of the internal combustion engine having the cylinder liner constructed as described above, the lubricating oil 6 retained in the top land clearance 5 reciprocates in the vicinity of the top dead center of the piston 3. Scatter upward due to inertial force. However, the splashed lubricating oil enters the oil receiving tray 8 through the lower end opening 8c of the oil receiving tray 8 attached to the sliding surface 1a of the cylinder liner and adheres to the inner surface of the oil receiving tray 8, or is adhered to the inner surface of the oil receiving tray 8. It collides and is returned to the topland clearance 5. Therefore, the lubricating oil 6 does not enter or scatter in the combustion chamber 9 by the reciprocating movement of the piston 3.

FIG. 3 shows a second embodiment of the present invention. In FIG. 3, 8 is an oil pan, which is divided into a plurality of pieces in the circumferential direction of the cylinder liner 1 in the same manner as in the first embodiment shown in FIGS. The piston 3 is fixed to the surface 1a so as not to interfere with the piston top surface at the top dead center.

An oil sump 8d is formed by bending the lower portion of the oil receiving tray 8 toward the cylinder liner 1 side. On the other hand, a plurality of oil absorption holes 1b are formed in the cylinder liner 1 at equal intervals in the circumferential direction, and oil absorption pipes 7 are screwed and fixed to the openings of the oil absorption holes 1b on the cylinder liner sliding surface 1a side. There is. The oil absorbing pipe 7 is bent downward with respect to the cylinder liner 1 and opens into the oil sump 8d of the oil receiving tray 8.

Reference numeral 11 is an electromagnetic valve, 12 is a suction device, and 13 is a suction pipe. When the suction device (suction pump or the like) is operated, the lubricating oil in the oil sump 8d of the oil receiving tray 8 is absorbed by the oil suction pipe 7 and the oil suction pipe. Suction is performed through the hole 1b, the solenoid valve 11, and the suction pipe 13, and is discharged to the lubricating oil collecting portion (not shown).

Reference numeral 14 is a valve control device for controlling the opening and closing of the solenoid valve 11, and reference numeral 15 is a pulse transmitter for transmitting a crank angle pulse in conjunction with the crankshaft. Further, as shown in FIG. 1, the solenoid valve 11 is fixed to the outer wall surface of the cylinder liner 1 and receives the opening / closing control signal from the valve control device 14 to open / close the suction conduit 13.

During operation of the internal combustion engine equipped with the cylinder liner lubrication device having the above-described structure, the inertial force acting on the lubricating oil 6 stored in the top land clearance 5 becomes maximum at the top dead center of the piston, and the same lubrication is performed. The oil tries to be scattered as combustion oil 6a into the combustion chamber 9, but is caught by the oil receiving tray 8 and accumulates in the oil sump 8d. The trapped oil 6b is collected by the suction force of the suction device 12 through the oil suction pipe 7 and the oil suction hole 1b of the cylinder liner, and further from the opened solenoid valve 11 through the suction pipe 13. This makes it possible to reuse the trapped lubricating oil that would otherwise be wasted oil, leading to a reduction in engine operating costs.

In the above embodiment, when the oil absorption pipe 7 and the oil absorption hole 1b of the cylinder liner are normally open, the high-pressure combustion gas pressure generated in the combustion chamber 9 leaks from the oil absorption hole 1b to improve engine performance. The solenoid valve 11 that opens the oil absorption passage at a required time is provided because it lowers the pressure. The solenoid valve 11 is normally closed, but the piston 3
Is near the bottom dead center and the pressure in the combustion chamber is decreasing, the valve control device 14 commands the valve to open and the trapped oil 6b is recovered.

The valve control device 1 controls the opening / closing timing of the solenoid valve 11.
4 gives a signal of the current piston position to the valve controller 14 for commanding. This signal is detected by a pulse generator 15 connected to the crankshaft so as to be synchronized with the rotation of the engine.

As described above, when the electromagnetic valve 11 is opened and the trapped oil 6b is sucked, it is preferable that the pressure in the combustion chamber 9 be reduced, but the frequency (electromagnetic with respect to engine rotation) The opening / closing ratio of the valve 11) can be arbitrarily set by the valve control device 14.

[0023]

The present invention is configured as described above.
According to the invention of claim 1, the scattered oil due to the inertial force of the reciprocating movement of the piston is captured by entering the oil receiving tray from the lower opening of the oil receiving tray, and the upward scattering is prevented.

As a result, the consumption of lubricating oil is reduced, and the operating cost of the engine can be reduced. In addition, it is possible to prevent seizure and increase in wear of the sliding contact portion between the cylinder liner and the piston ring due to insufficient lubrication oil on the sliding surface of the cylinder liner.

According to the second aspect of the present invention, the lubricating oil captured by the oil pan can be collected outside through the drain passage with the solenoid valve, so that the lubricating oil can be reused and the engine can be operated. Cost reduction can be realized. Also, since the above-mentioned oil discharge path is opened and closed by the solenoid valve that opens and closes in conjunction with the engine speed, it is possible to discharge the lubricating oil in the oil pan when the pressure in the combustion chamber, which is suitable for sucking and discharging the lubricating oil, is low. Therefore, the lubricating oil captured in the oil pan can be collected without waste.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view near a cylinder liner sliding portion for an internal combustion engine according to a first embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a view corresponding to FIG. 1, showing a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the vicinity of a cylinder liner sliding portion of an internal combustion engine.

FIG. 5 is an enlarged cross-sectional view showing the vicinity of a conventional cylinder liner sliding portion.

[Explanation of symbols]

 1 Cylinder Liner 1a Cylinder Liner Sliding Surface 2 Cylinder Cover 3 Piston 4 Piston Ring 5 Top Land Clearance 7 Oil Absorption Tube 8 Oil Receptacle 8b Recess 8c Opening 8d Oil Reservoir 9 Combustion Chamber 11 Solenoid Valve 12 Suction Machine 13 Suction Pipe 14 Valve Control apparatus

Claims (2)

[Claims] 1. In a reciprocating engine such as an internal combustion engine, a lower end is opened downward and an upper end is opened above a piston top surface at a top dead center of an inner surface (sliding surface) of a cylinder liner. A lubricating device for a cylinder liner, which is closed and has an oil pan fixed to capture oil scattered from the topland clearance. 2. The oil pan is provided with an oil sump portion for accumulating splashed oil, one end of which is opened to the oil sump portion and the other end of which is opened to the outside, respectively, to discharge the lubricating oil in the oil sump portion. 2. The cylinder liner lubrication device according to claim 1, further comprising an oil passage and a solenoid valve which opens and closes the oil discharge passage in association with rotation of the engine.