JPH10141035A - Cylinder liner lubricating structure of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make effective use of lubricant by forming oil supply holes in a cylinder liner to be open to a hole or an oil groove in a cylinder liner inner wall while facing the wall of the holes or the oil groove so that oil can be supplied into the cylinder liner from time to time in a piston stroke. SOLUTION: For effective lubrication between the inner wall of a cylinder liner 1 and a piston ring 9, plural oil supply holes (b) are provided in one cylinder liner 1 to form an oil groove (c) in the peripheral direction. A hole is formed in a cylinder liner inner wall to be communicated with the oil groove (c), in which an end hardware 7 and an oil supply hardware 2, internally mounted with a check valve 3, a spring 4 and a spring holddown 5, are fitted in sequence. The end hardware 7 has an oil supply hole 6 made into an L-shape for its opening (e) to be open to the wall of the oil groove (c). A positioning pin (12) is laid between the end hardware 7 and the cylinder liner 1 to fix the direction of the opening (e).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating structure for a cylinder liner of an internal combustion engine, and more particularly to an internal combustion engine using a timing lubrication system for lubricating a cylinder liner during an appropriate period of a piston stroke.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, for example, a lubricating structure for a cylinder liner of an internal combustion engine includes an oil groove c 'formed by being engraved around the inner wall of the cylinder liner 1.
A lubrication hole b 'is drilled in a direction perpendicular to the inner wall surface of the liner so that a part of the lubrication metal part 2' extends inward. To match.

[0003] A check valve 3 ', a spring 4', and a spring retainer 5 'are provided inside the lubrication fitting 2'. In addition, 8 is a piston, and 9 is a piston ring. In such a configuration,
The lubricating oil supplied from the lubricator 11 (not shown) flows from the oil inlet d 'through the check valve 3' and the lubrication hole b 'to the oil groove c'.
And lubricates between the cylinder liner 1 and the piston ring 9. In some cases, the oil groove c 'is not provided, but in any case, the lubrication hole b' is opened directly on the inner wall a of the cylinder liner 1,
And the cylinder liner 1 is lubricated.

Further, in such a lubricating structure, in order to perform lubrication effectively, lubrication is performed in a timely manner before the piston 8 passes through the lubrication hole b 'in the compression stroke and before the piston ring 9 has passed. A timing lubrication method is adopted.

[0005]

However, when the above-described timing lubrication method is employed, the lubricating oil is intermittently lubricated in a short period of time at appropriate intervals of the piston stroke, so that the flow velocity in the oil passage is relatively high. In FIG. 6, since the check valve 3 'opens rapidly when the pressure balance between the spring chamber f' and the oil inlet d 'is lost, the oil instantaneously increases at a higher speed. And is ejected into the cylinder liner 1. For this reason, the lubricating oil does not stay on the oil groove c 'or the wall surface of the cylinder liner 1 but jumps into the cylinder and adheres to the top of the piston 8 or is burned by being exposed to the combustion gas in the cylinder and burned. The problem arises.

In view of the above technical problems, the present invention prevents lubricating oil from spilling out into the cylinder even if oil is intermittently injected for a short period of time at appropriate intervals of the piston stroke, and adheres to the piston head. It is an object of the present invention to provide a lubricating structure for a cylinder liner of an internal combustion engine in which a lubricating oil is effectively used without being burned by being exposed to a combustion gas.

[0007]

SUMMARY OF THE INVENTION The present invention relates to
In order to prevent the lubricating oil from jumping directly into the space inside the cylinder, do not open the lubrication hole of the cylinder liner directly to the inner wall of the cylinder liner, but to the hole or oil groove provided on the inner wall of the cylinder liner. The gist is that the oil groove and the lubrication hole are arranged so as not to face the inner space, and the oil coming out of the opening hits the hole or the wall of the oil groove. That is, the invention according to claim 1 is an internal combustion engine using a timing lubrication system that lubricates a cylinder liner during an appropriate period of a piston stroke, without directly opening a lubrication hole of the cylinder liner to an inner wall of the cylinder liner. A lubricating structure for a cylinder liner, wherein the lubrication structure has an opening in a hole or an oil groove provided in an inner wall of the cylinder liner and an opening facing the wall surface of the hole or the oil groove.

According to such technical means, as shown in the embodiment of FIGS. 1 and 3, lubrication holes b, b ₁ of the opening e, a e _1,
Not towards the space inside the cylinder, since toward the hole g ₁ or oil grooves c, the wall of c _1, is discharged lubricating oil, once the hole g ₁
Or oil groove c, collides with the wall surface of the c _1. For this reason, the flow velocity of the lubricating oil is attenuated, and the lubricating oil does not fly out into the space in the cylinder due to the inertial force.

In order to prevent the lubricating oil from spilling out into the space in the cylinder due to the inertial force, the opening of the lubrication hole is oriented in the tangential direction of the cylinder liner, and the oil is provided in the oil groove provided in the tangential direction of the cylinder liner. A method of discharging along the groove is considered, but in this case, the lubricating oil temporarily stays in the oil groove,
The timing at which the lubricating oil is supplied to the inner wall of the cylinder liner and the piston ring is delayed, so that timing lubrication cannot be substantially realized.

On the other hand, according to the present invention, the distance between the inner wall a of the cylinder liner and the wall surface of the oil groove c or the hole g is short, and the flow velocity of the lubricating oil is only attenuated. Lubrication at the right time is also possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a longitudinal sectional view showing a configuration of a lubrication hole portion of a cylinder liner of an internal combustion engine according to an embodiment of the present invention. The lubrication between the inner wall surface of the cylinder liner 1 and the piston ring 9 is improved. It is something to try. 6, a plurality of lubrication holes b are provided in one cylinder liner 1, and an oil groove c is provided in the circumferential direction from the lubrication hole b. Oil groove c on the cylinder liner inner wall
Is provided. A hole 1a into which the metal tip 7 is inserted is provided so as to communicate with the oil groove c. d is an oil inlet. The oil groove c is, as seen in FIG.
At the top to help spread the lubricant by its own weight.

The lubricating oil is timely pressurized by the plunger of the lubricator 11 (not shown) when the piston is at the optimal position for lubrication. In other words, the piston 8 passes through the oil groove c during the compression stroke of the piston 8. Before and after passing, pressurized lubrication is performed at the same time until the passage is completed, and the lubrication is supplied to the lubricating hardware 2. A check valve 3, a spring 4, and a spring retainer 5 are provided inside the lubrication fitting 2. A lubrication hole 6 is provided in the tip metal member 7, and the lubrication hole 6 is drilled in an L-shape so that the opening e opens toward the wall surface of the oil groove c so as not to face the space in the cylinder. I have. The positioning pin 12 is fitted between the tip metal 7 and the cylinder liner 1 to determine the direction of the opening e.

According to this embodiment, the opening e of the lubrication hole b is provided.
Is directed toward the wall surface of the oil groove c instead of toward the space in the cylinder, so that the lubricating oil timely pressurized and supplied from the plunger of the lubricator 11 is discharged from the opening e and temporarily It collides with the wall of c. For this reason, the flow velocity of the lubricating oil is attenuated, and the lubricating oil does not fly out into the space in the cylinder due to the inertial force.

FIGS. 3 to 5 show a simplified version of the embodiment shown in FIG. Lubrication hole b
₁ is provided in the cylinder liner 1, the opening e ₁ is 4
In the oil groove c is open toward the wall surface of the hole g ₁ in the oil grooves c ₁ or 5 parts of lubrication holes b ₁ in cutaway Ward form. Therefore, the opening e ₁ of the lubrication holes b _1, not toward the space in the cylinder, because it towards the wall of the hole g ₁ or oil grooves c _1, is discharged lubricating oil, once the hole g ₁ or collides with the wall surface of the oil groove c _1. For this reason, the flow velocity of the lubricating oil is attenuated, and the lubricating oil does not fly out into the space in the cylinder due to the inertial force.

[0016]

As described above, according to the present invention, the lubricating oil does not fly out into the cylinder, does not adhere to the piston head, and does not burn when exposed to combustion gas. Used for

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a configuration of a lubrication hole portion of a cylinder liner of an internal combustion engine according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of an oil groove as viewed from an inner wall of the liner of FIG. 1;

FIG. 3 is a longitudinal sectional view of a configuration of a lubrication hole portion of a cylinder liner of an internal combustion engine according to a second embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of an oil groove viewed from an inner wall of the liner of FIG. 3;

FIG. 5 is an enlarged view of a main part of a lubrication hole and a hole instead of an oil groove in FIG. 3;

FIG. 6 is a longitudinal sectional view of a configuration of a lubrication hole portion of a conventional cylinder liner of an internal combustion engine.

FIG. 7 is an enlarged view of a main part of an oil groove viewed from an inner wall of the liner of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder liner 2 Lubrication hardware 3 Check valve 8 Piston 9 Piston ring 11 Lubricator b Lubrication hole c Oil groove e Opening

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroshi Rikimaru 7-1-14 Wadamiya-dori, Hyogo-ku, Kobe Nishiishi Engineering Co., Ltd.

Claims (1)

[Claims] 1. An internal combustion engine using a timing lubrication system for lubricating a cylinder liner during an appropriate period of a piston stroke, wherein a lubrication hole of the cylinder liner is formed on an inner wall of the cylinder liner without directly opening the inner wall of the cylinder liner. A lubricating structure for a cylinder liner, wherein the lubricating structure is opened in a provided hole or oil groove, and the lubricating hole opening is opened to face the wall surface of the hole or oil groove.