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Water-Cooled Engine and Cylinder Block Thereof

a technology of water-cooled engines and cylinder blocks, which is applied in the direction of machines/engines, mechanical devices, cylinders, etc., can solve the problems of difficult cooling, deformation of blow holes, and high cost, and achieve the effect of facilitating the formation of water jackets

Inactive Publication Date: 2008-10-09
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]Accordingly, it is an objective of the present invention to provide a water-cooled engine that facilitates formation of a water jacket about cylinder bores and to provide a cylinder block of the engine.

Problems solved by technology

Therefore, casting deficiencies such as blow holes are likely to be formed.
Such casting deficiencies degrade the quality.
In the die for casting such a cylinder block, a portion for molding the water jacket is extremely thin and difficult to cool.
This results in a shortened life of the die.
Therefore, the above described deficiencies are inevitable when casting the cylinder block.
However, the cylinder liner is not directly fixed to the cylinder head, and is pressed downward by the head gasket.
This degrades the sealing of coolant and combusted gas.
However, the projection is not sufficient to permit the top surface of the cylinder liner to follow deformation of the cylinder head bottom surface.

Method used

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  • Water-Cooled Engine and Cylinder Block Thereof
  • Water-Cooled Engine and Cylinder Block Thereof
  • Water-Cooled Engine and Cylinder Block Thereof

Examples

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Embodiment Construction

[0027]A water-cooled engine 1 and a cylinder block 3 of the engine according to one embodiment of the present invention will now be described with reference to drawings.

[0028]FIG. 1 is a perspective view illustrating a main body of the water-cooled engine 1 of the present invention. The engine 1 is in-line four cylinders. Generally, the main body of the water-cooled engine 1 consists of a cylinder head 2 and the cylinder block 3. The cylinder head 2 and the cylinder block 3 are fastened to each other with a gasket 4 in between with bolts. Although not illustrated, a head cover is attached to the upper side of the cylinder head 2, and an oil pan is attached to the lower side of the cylinder block 3.

[0029]FIG. 2(a) is a perspective view of the cylinder block 3, and FIG. 2(b) is a side view of the cylinder block 3. As shown in these drawings, the cylinder block 3 has four cylinder bores 5 formed in an upper portion. A crankcase portion 31, or a skirt portion of the cylinder block 3, is...

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PUM

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Abstract

A cylinder block has a cylinder bore and a water jacket provided about the cylinder bore. The cylinder block is divided at the water jacket into a cylinder liner portion and a cylinder outer wall portion. The cylinder liner portion has a wall defining the cylinder bore. The cylinder outer wall portion surrounds the wall of the cylinder liner portion, thereby defining the water jacket between the cylinder outer wall portion and the wall of the cylinder liner portion. The cylinder liner portion includes an upper deck portion integrally formed with the cylinder liner portion. The upper deck portion contacts the cylinder head assembled to the cylinder block. The cylinder outer wall portion has a top surface that functions as a receiving surface that contacts and supports the upper deck portion.

Description

TECHNICAL FIELD[0001]The present invention relates to a water-cooled engine that has a cylinder block assembled with a cylinder head, which cylinder block has a water jacket defined about cylinder bores. The present invention also pertains to a cylinder block used in such a water-cooled engine.BACKGROUND ART[0002]In the cylinder block of a water-cooled engine, a water jacket for circulating coolant is defined about cylinder bores. The cylinder block generally consists of an upper cylinder liner portion in which cylinder bores are formed, and a lower crankcase portion that forms a crankcase.[0003]The types of the water jacket in the cylinder block of such a water-cooled engine include an open-deck structure in which the water jacket is open at the top of the cylinder block and a closed-deck structure in which the water jacket is not open at the top of the cylinder block but closed.[0004]Japanese Laid-Open Utility Model No. 62-119450 discloses a cylinder block for a water-cooled engin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01P3/00F02F1/16F01P3/02F02F1/00F02F1/10F02F7/00
CPCF02F1/10F02F1/108F02F7/0007
Inventor ISHIKAWA, YUJIROU
Owner TOYOTA JIDOSHA KK
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