JPS6240083Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a cylinder liner lubricating device for a diesel engine.

Conventional cylinder liner lubrication devices, for example,
As shown in the figure, a circumferential groove 2 is formed on the inner peripheral surface of the liner 1, a lubricant pipe connection hole 3 communicating with the circumferential groove 2 is provided at one location, and a lubricant pipe 4 is inserted into this lubricant pipe connection hole 3. It is structured like this. However, the device shown in FIG. 1 has the following problems.

(1) Since lubricating oil is supplied from one connection hole 3 to the entire inner peripheral groove 2, the oil supply range is biased to the area near the one connection hole 3, and the inner peripheral surface of the liner 1 It is difficult to lubricate evenly all around.

(2) Since the piston ring violently comes into sliding contact with the circumferential groove 2 on the inner circumferential surface of the liner 1, local wear occurs, making it even more difficult to apply lubricating oil evenly.

(3) Since the structure is such that the oil supply pipe 4 is inserted into the connection hole 3, it takes time and effort to remove the liner 1.

(4) Since the oil supply pipe 4 is inserted from the outside of the cylinder block 5 through the cooling water jacket 6,
Cooling water may get mixed into the lubricating oil.

In this invention, oil is supplied to the inner circumferential surface of the liner from a groove on the outer circumferential surface of the liner through a plurality of lubricant outlet holes, and the entire circumferential groove is used to lubricate the cylinder block without using a joint pipe or the like. This is intended to solve the problems of the conventional example described above by communicating with the oil supply oil path. The present invention will be explained below based on the drawings.

In FIG. 2, 11 is a cylinder block;
2 is a cylinder liner, and cylinder liner 1
The outer circumferential surface of the lower portion of the cylinder block 2 is fitted into the inner circumferential surface 14 of the cylinder block cylindrical portion 13 via three O-rings 15 in a fluid-tight manner. A full circumferential groove 16 for lubricating oil is formed on the outer peripheral surface of the liner 12 between the two lower O-rings 15;
A horizontal lubricating oil supply passage 17 is formed in the wall portion of the cylinder block 11 facing the cylinder block 11 . The circumferential groove 16 and the supply oil passage 17 are in direct communication without using a joint pipe or the like.

In a portion of the liner 12 slightly above the upper end of the cylindrical portion 13, a plurality (for example, four) of lubricating oil outlet holes 18, 18' are formed at equal intervals in the circumferential direction of the liner, and each outlet Holes 18, 18' are liner 12
It opens toward the center line side. Each outlet hole 18,
The vertical formation position of 18' is a position facing between the two piston rings 21 of the piston 20 in the bottom dead center state. That is, each outlet hole 18, 18' is formed so as to face the second land portion 23 of the piston 20 in the bottom dead center state. Further, the molding position of each outlet hole 18, 18' in the circumferential direction is determined by the hollow piston pin 24 as shown in FIG.
The position near the openings at both ends of the piston 2 is avoided.
0 (FIG. 2), the openings at both ends of the piston pin 24 do not pass through the outlet holes 18, 18'.

Each outlet hole 18, 18' has a vertical oil passage (bore hole) 25 and a horizontal oil passage 2 in the wall of the liner 12, respectively.
6 and communicates with the circumferential groove 16. Oil road 2
5, 26 are of course provided in the same number as each outlet hole 18, 18'. The oil passage 25 is bored upward from the lower edge of the liner 12, and the lower end is closed by a plug 19.

The four outlet holes 18, 18' (FIG. 3)
Among them, the two outlet holes 1 on the substantially opposite sides of the supply oil passage 17
8 has two outlet holes 18' near the supply oil passage 17
In other words, by increasing the diameter of the outlet hole 18, which has a long oil path length from the oil supply passage 17, the amount of lubricating oil discharged from each outlet hole 18, 18' can be made more uniform. However, the diameter of the outlet hole 18 is smaller than the vertical width of the second land portion 23.

The inlet of the supply oil passage 17 is connected to a joint 27 (second
It is connected to the lubricating oil pump via the Second
28 in the figure is a cooling water jacket.

The lubricating oil supplied from the supply oil passage 17 to the circumferential groove 16 always fills the circumferential groove 16 and reaches each outlet hole 18, 18' via each oil passage 26, 25, and the lubricating oil is supplied to the circumferential groove 16. It is supplied between the outer circumferential surface and the inner circumferential surface of the liner 12 and spreads over the entire inner circumferential surface of the liner 12 as the piston 20 moves up and down. As a result, the inner peripheral surface of the liner 12, the piston 20, and the piston ring 21 are lubricated.

When removing the cylinder liner 12, the connection between the circumferential groove 16 and the supply oil passage 17 can be separated by simply pulling out the liner 12 after removing the cylinder head, for example. That is, there is no need to remove the oil supply pipe 4 as shown in FIG.

As explained above, the present invention provides outlet holes 18, 18' that open toward the center of the cylinder liner 12.
are formed at approximately equal intervals in the liner circumferential direction, and liner wall oil passages 2 are formed in the outlet holes 18, 18'.
5 and 26 is formed between the O-rings 15 on the outer circumferential surface of the liner 12, and by fitting the liner 12 to the cylinder block 11, the outer circumferential groove 16 is connected to the joint pipe. The lubricating oil supply passage 17 of the cylinder block 11 can be
Because it communicates directly with the

(1) The lubricating oil is first supplied to the outer circumferential groove 16 of the liner 12, from which it is discharged through a plurality of outlet holes 18, 18'.
Since the lubricating oil is supplied to the inner peripheral surface of the liner 12 via the oil supply passage 17, a roughly uniform amount of lubricating oil can be supplied over the entire inner peripheral surface area of the liner 12, compared to the structure having the inner peripheral groove 2 and one connection hole 3 as in the conventional example shown in Fig. 1. In other words, sufficient lubricating oil can be supplied even to the portion of the liner 12 far from the oil supply passage 17.

(2) In the conventional example shown in FIG. 1, the inner circumferential groove 2 is locally severely worn due to friction with the piston ring, making it impossible to apply lubricating oil evenly over the entire circumferential range of the liner 12. Although this becomes more difficult, in the present invention, the entire circumferential groove 16 is formed on the outer peripheral surface of the liner 12, so there is no worry of local wear of the circumferential groove 16, and more reliable and even lubrication can be performed. can.

(3) Since the circumferential groove 16 and the supply oil passage 17 are in direct communication with each other in a so-called pipeless structure, the removal and installation work of the cylinder liner 12 is not time-consuming. In other words, piping work, etc. is no longer necessary.

(4) Circumferential groove 16 between O-ring 15 and supply oil passage 17
There is no need to worry about cooling water getting mixed into the lubricating oil.

Note that liner lubrication devices are often used, especially in diesel engines that use residual fuel. In other words, in engines that use residual fuel, the degree of wear on liners, pistons, and piston rings increases due to combustion residues, but by forcefully injecting lubricating oil with a liner lubrication device, combustion residues can be washed away and liners etc. This prevents wear.

In addition, in response to sulfuric acid corrosion during low loads, forced lubricating oil neutralizes the sulfuric acid and prevents corrosion of the inner peripheral surface of the liner, etc.

Note that the number of outlet holes 18, 18' in the present invention may be two or more, but in order to uniformly lubricate the entire inner peripheral surface of the liner 12, four or five or more are appropriate. it is conceivable that.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing a conventional example, Fig. 2 is a longitudinal cross-sectional view of a cylinder liner to which the present invention is applied (-cross-sectional view in Fig. 3), and Fig. 3 is a - cross-sectional view in Fig. 2. . 11...Cylinder block, 12...Cylinder liner, 15...O ring, 16...Full circumference groove, 1
7... Lubricating oil supply oil passage, 18, 18'... Lubricating oil outlet hole, 25, 26... Oil passage.

Claims (1)

[Scope of utility model registration request] A plurality of lubricating oil outlet holes opening toward the center of the cylinder liner are formed at approximately equal intervals in the circumferential direction of the liner, and a circumferential groove communicating with each of the outlet holes via an oil passage in the liner wall is formed. By forming the liner between the O-rings on the outer peripheral surface of the liner and fitting the liner to the cylinder block, the entire outer circumferential groove is directly connected to the lubricating oil supply path of the cylinder block without using a joint pipe or the like. Characteristic cylinder liner lubrication system for internal combustion engines.