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Cylinder block

A technology of cylinder block and cylinder liner, which is applied in the direction of cylinder, cylinder head, engine components, etc., can solve the problem of high temperature of cylinder liner and push rod chamber, and achieve the effect of improving fluidity of casting liquid, shortening distance and reducing heat dissipation efficiency

Inactive Publication Date: 2008-06-04
SUBARU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this type of engine, it is difficult to form cooling fins for cooling the cylinder on the side of the cylinder where the push rod chamber is formed in design, so there is a problem that the temperature between the cylinder liner and the push rod chamber is high.

Method used

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Embodiment Construction

[0017] Hereinafter, an embodiment of an air-cooled OHV engine using the present invention will be described with reference to the drawings. Fig. 1 is a sectional view schematically illustrating the structure of an engine according to an embodiment of the present invention, Fig. 2 is a sectional view of a cylinder block taken along line II-II in Fig. 3 , and Fig. 3 is a sectional view taken along line III-III in Fig. 2 Figure 4 is a cross-sectional view of the cylinder liner cut along line IV-IV in Figure 5. Fig. 5 is a sectional view of the cylinder liner taken along line V-V in Fig. 4 .

[0018] The engine 100 is, for example, an air-cooled OHV single-cylinder 4-cycle general-purpose engine used in various applications such as generators, construction machines, and snowmobiles.

[0019] As shown in FIG. 1 , an engine 100 includes a cylinder block 1 in which a crankcase 3 is integrally formed below cylinders 2 and a cylinder head 21 is attached above the cylinders 2 . In add...

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PUM

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Abstract

The present invention provides a kind of cylinder body, which can realize the miniaturization of the engine, and doesn't injury the fluidity of the casting liquid and the heat emission efficiency of the engine. The cylinder body (1) of the OHV or SV mode gas-cooling engine formed through cast-in of the cylinder liner (4) is characterized in that it comprises cylinder liner (4) casted in the cylinder and provided with a substantially tubular heat-resisting part; a main body part integrally formed under the heat-resisting part with a wall thickness less than that of the heat-resisting part; and four plane surfaces (10) formed by the out-circuit extended along the axis direction and configured at interval along the circumference; and push rod room (7), which formed in the side of the cylinder cover (4), and comprises the push rod (23) of the driving outlet valve (23), the cylinder liner (4) setting to make the plane surface (10) face the push rod room (7). A cooling air passage is formed in the cylinder between the plane surfaces and the push rod room.

Description

technical field [0001] The invention relates to a cylinder block inlaid with a cylinder liner in an air-cooled engine. Background technique [0002] As is well known, vehicle engines, general-purpose engines, and the like are generally composed of cylinder blocks formed of cast iron or aluminum alloy castings. A cylinder liner is cast into the cylinder block, which is made separately from the cylinder block and serves to slide the piston inside it. [0003] For this cylinder liner, various proposals have been made so far. For example, Japanese Unexamined Patent Publication No. 2005-188398 (Patent Document 1) discloses a cylinder liner structure in which an end portion on the cylinder head side is chamfered into a tapered shape. According to this technique, it is possible to suppress the occurrence of cracks in the vicinity of the joint end between the cast-in portion of the cylinder block and the cylinder liner having the protrusion, and prevent the deterioration of the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F1/04
Inventor 本乡成敦
Owner SUBARU CORP
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