JPS6260965A - Two-stage type cylinder liner - Google Patents

Abstract

PURPOSE:To facilitate the replacement of a piston ring and a cylinder liner by dividing the cylinder liner into the upper and lower parts in the vicinity of an oil pouring hole and joinning these upper and lower cylinder liners by screws, etc. CONSTITUTION:The divided part 4 of a cylinder liner is installed at the lower edge of an oil pouring groove 2 on the lower side from an oil feeding hole 1. Chamferring is performed if necessary onto the inside of the divided part 4, and the superior lubricity of a piston ring is maintained by allowing the chamferred part to hold the lubricating oil Further, the upper and lower parts 7 and 8 of the cylinder liner are fixed by using a fine screw 5. Therefore, the piston ring can be replaced by demounting only the upper part of the cylinder liner, and even if the upper part of the cylinder linear is worn out, it is enough to replace the above-described part only.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-stage cylinder liner for a diesel engine.

[Conventional technology]

Figure 2 shows a conventional cylinder liner + with a single continuous pipe structure, and the single pipe has lubrication holes 1. Lubrication groove 2. A scavenging hole 3 is installed.

[Problem that the invention seeks to solve]

(1) Normally, only the top ring of the cylinder liner wears out, but since the entire cylinder liner has a one-piece structure, when wear progresses, the entire cylinder liner must be replaced, which is wasteful.

(2) Although piston rings are replaced relatively frequently, the piston ring cannot be replaced unless the piston is removed from the cylinder, which has the drawback of making the work extremely troublesome.

The purpose of the present invention is to eliminate the drawbacks of the conventional device, to make it possible to replace the piston ring without pulling out the piston from the cylinder, and to replace only the upper liner when the cylinder liner is worn out. 2
To provide stepped shilling liners.

[Means to solve the problem]

In order to eliminate the above-mentioned drawbacks, the two-stage wall/cylinder liner of the present invention is characterized in that the cylinder liner is divided into upper and lower parts in the vicinity of the oil fill hole, and these upper and lower cylinder liners are connected by screws or the like.

[Effect]

Since it is configured as above, it is possible to replace the hydraulic cylinder by removing only the upper part of the two-stage type/renoda liner, and even if the upper part of the cylinder litchi becomes worn out, only that part can be replaced. Bye.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

Figure 1 (a) is the inner view of the ring lychee, Figure 1 (b)
is a sectional view of FIG. 1(a).

/Insert the cylinder liner divided part 4 into the lubrication groove 2 below the lubrication hole 1.
The inner side of the divided portion 4 is chamfered as necessary.

Lubricating oil can be retained in this chamfered portion, and the lubricity of the piston ring can be maintained well.

If you use precision screws 5 to fix the upper and lower parts 7 and 8 of the cylinder, and accurately align the center of the divided part with the screws, the deviation of the divided part 4 before and after assembly can be extremely minimized. It is possible to do so.

In addition, in the case of a structure in which the oil fill holes 1 are drilled in the upper and lower cylinder liner mounting threads 5, the center of each oil fill hole 1 may be misaligned due to tightening of the screws after the upper and lower cylinder liners 7.8 are assembled, resulting in poor passage of oil. In order to prevent this from occurring, a lubrication trap 6 is cut into the threaded portion 5 around the lubrication hole 1.

〔Effect of the invention〕

Since the two-stage cylinder litchi of the present invention is constructed as described above, the following effects can be obtained.

(1) Since the cylinder liner is divided into upper and lower parts, the piston ring can be replaced without removing the piston upward, and since the upper part of the cylinder liner can be worn, the lubricity of the piston ring can be maintained well.

(3) When a lubrication hole is drilled in the joint thread of the upper and lower cylinder liners, there is a lubrication pool in the threaded part around the lubrication hole, so the center of the lubrication hole may be slightly shifted after the upper and lower cylinder liners are assembled. Even if this occurs, lubrication can be performed normally.

[Brief explanation of the drawing]

Figures 1 (a) and (b) show examples of the present invention (Figure aj is an inner view of the cylinder liner, (b) A--A in Figure 14 (a)
A sectional view, Fig. 2 (a), (b) u Conventional example (a
) Figure is the inner view of the cylinder liner, Figure (b) is the B of Figure (a).
-B sectional view. 1... Oil supply hole, 5... Screw, 7... Upper cylinder liner, 8... Lower cylinder liner. Figure 2

Claims (1)

[Claims] A two-stage cylinder liner characterized by dividing the cylinder liner into two stages, upper and lower near the oil fill hole, and fixing the upper and lower cylinder liners with screws.