JPH0343400Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in the structure of a cylinder liner in an internal combustion engine, which is frequently used as a power source for automobiles and various other machines and devices.

[Conventional technology]

Conventionally, as this type of cylinder liner, for example, as shown in FIG.
The annular flange wall 12 at the upper end edge 13 is formed in a solid state protruding outward, and when installed, the annular flange wall 12 is attached to the step 14' at the mounting opening edge on the cylinder block 14 side. The cylinder head 15, on which the gasket 16 is installed, is tightened from above by pressing the end circumference of the flange wall 12.

[Problem that the invention attempts to solve]

However, in such a conventional structure, due to the structure of the solid flange wall 12, in addition to the large pressing force applied to the end circumference of the flange wall in the attached state, the cylinder Due to the pressure and impact fluctuations caused by the constantly repeated piston operations inside the liner, fatigue stress concentrates near the base of the flange wall 12, resulting in cracks and breakage.

In order to extremely effectively solve the above-mentioned conventional problems, the present invention comprises configuring the flange wall with an adjustment gap having a U-shaped cross section along the inner peripheral surface of the flange wall. When pressed against the end circumference of the flange wall in the attached state, the adjustment gap exerts a resilient adjustment function, alleviating the concentration of fatigue stress that occurs near the base of the flange wall, preventing cracks and damage. Moreover, since the elastic deformation in the adjustment gap and the pressure caused by the constantly repeated piston operation act as internal pressure in the adjustment gap, the cylinder block side at the step and the cylinder head side at the pressing surface. The object of the present invention is to provide a cylinder liner that can further improve airtightness with the cylinder liner.

[Means to solve the problem]

The present invention provides an internal combustion engine in which an annular flange wall protruding outward from the upper end edge of a metal cylinder is configured with an adjustment gap having a U-shaped cross section along the inner peripheral surface of the flange wall. The main topic is cylinder liners for engines.

〔Example〕

Below, embodiments of the present invention will be explained based on the drawings. Fig. 1 is a partial vertical sectional view of the cylinder liner for an internal combustion engine of the present invention, and Fig. 2 is a partially cutaway view of the installed state of Fig. 1. 1 is a vertical cross-sectional view according to the drawing, in which 1 indicates an outward annular collar wall 2 projecting from the upper end edge 3.
It is a metal cylindrical body having an adjustment gap 4 having a U-shaped cross section along the inner circumferential surface of the flange wall, and a step 5' at the end edge of the mounting opening on the cylinder block 5 side. The flange wall 2 is secured to the cylinder head 6, and with the gasket 7 laid down, the end circumference of the flange wall 2 is pressed while being tightened from above.

[Effect]

Since the present invention is constructed in this way, when the periphery of the end of the flange wall 2 is pressed when it is attached to the cylinder block 5 side, the adjustment gap 4 can exert a spring adjustment function. The concentration of fatigue stress occurring near the base of the flange wall is alleviated, and the pressure accompanying the constantly repeated piston operation is applied as internal pressure to the adjustment gap 4.

[Effect of idea]

As explained above, the cylinder liner of the present invention prevents cracks near the base of the flange wall 2 by alleviating the fatigue stress through the adjustment gap 4.
Damage can be reduced and prevented, and at the same time, due to the elastic deformation in the adjustment gap 4 and the function of the pressure accompanying the piston operation in the adjustment gap as internal pressure, the cylinder block 5 at the stepped portion 5' is This is an extremely useful cylinder liner for an internal combustion engine that can further improve airtightness with the cylinder head 6 side on the side and pressing surface.

[Brief explanation of drawings]

Fig. 1 is a partial longitudinal sectional view of a cylinder liner for an internal combustion engine showing an embodiment of the present invention, Fig. 2 is a partially cutaway longitudinal sectional view of the installed state shown in Fig. 1, and Fig. 3 is a conventional example. FIG. 3 is a partially cutaway vertical cross-sectional view of the attached state. 1... Metal cylindrical body, 2... Flange wall, 3... Upper edge, 4... Adjustment gap.

Claims (1)

[Scope of utility model registration request] The outer annular flange wall 2 protruding from the upper end edge 3 of the metal cylindrical body 1 is configured to have an adjustment gap 4 having a U-shaped cross section along the inner peripheral surface of the flange wall. Cylinder liners for internal combustion engines featuring: