JPH02118151U

JPH02118151U -

Info

Publication number: JPH02118151U
Application number: JP2700189U
Authority: JP
Priority date: 1989-03-09
Filing date: 1989-03-09
Publication date: 1990-09-21

Description

[Brief explanation of drawings]

第１図は本考案の実施例を示すピストンの断面
図、第２図は熱応力の分布図、第３図は合成応力
の分布図である。第４図は他の実施例を示すピス
トンの断面図である。第５図は従来例を示すピス
トンの断面図、第６図Ａは熱変形状態を示すピス
トンの平面図、第６図Ｂは同じく断面図、第７図
は熱応力を分布図、第８図Ａはピストンのガス圧
による変形状態を示す平面図、第８図Ｂは同じく
断面図、第９図はガス圧による応力分布図、第１
０図は合成応力の分布図である。１……ピストン、２……ピストン本体、２Ａ…
…ピストン頂部、２Ｂ……キヤビテイ開口縁部、
３……キヤビテイ、４……冷却空洞。 FIG. 1 is a sectional view of a piston showing an embodiment of the present invention, FIG. 2 is a distribution diagram of thermal stress, and FIG. 3 is a distribution diagram of composite stress. FIG. 4 is a sectional view of a piston showing another embodiment. Fig. 5 is a sectional view of a piston showing a conventional example, Fig. 6A is a plan view of the piston showing a state of thermal deformation, Fig. 6B is a sectional view of the same, Fig. 7 is a thermal stress distribution diagram, and Fig. 8 A is a plan view showing the state of deformation of the piston due to gas pressure, FIG. 8B is a cross-sectional view, FIG. 9 is a stress distribution diagram due to gas pressure, and FIG.
Figure 0 is a distribution diagram of the composite stress. 1... Piston, 2... Piston body, 2A...
...Piston top, 2B...Cavity opening edge,
3... Cavity, 4... Cooling cavity.

Claims

[Scope of utility model registration request]

In the piston of an internal combustion engine, which has a concave-shaped cavity at the top of the piston, a cooling cavity is formed on the outer periphery of the cavity, and oil circulates through this cooling cavity, the cooling cavity can be moved in the thrust direction orthogonal to the piston pin, and in the anti-thrust direction. A piston for an internal combustion engine, characterized in that each portion of the piston is formed so as to be separated from the outer peripheral area of the top of the piston.