JPS58202346A - Cylinder block and cylinder head fixing structure for multi-cylinder engine - Google Patents

Abstract

PURPOSE:To prevent deformation of a cylinder block due to the axial fastening force of a bolt, when fixing a cylinder block and a cylinder head, by making said force lower at both ends of a cylinder row than at the central side of cylinder row. CONSTITUTION:An engine 1 is equipped with a cylinder block 3 formed with a row of cylinder bores 2 and a cylinder head 5 mounted on it through a gasket 4, where the cylinder head 5 is coupled through a plurality of fastening bolts 6 with the cylinder block 3. Here the axial fastening force of the bolt 6 is made lower at both ends than the central portion such that it is approximately 1/2 or slightly higher at both ends than the central portion. Consequently the deformation of the cylinder block 3 shown by a virtual line can be relieved to prevent defective air-tightness, abrasion of piston and cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for mounting a cylinder block and a cylinder head in a multi-cylinder engine, particularly in a multi-cylinder engine.

In a multi-cylinder engine having cylinders arranged in a row, the cylinder block and the cylinder nozzles are connected by a plurality of bolts via gaskets. The gels are arranged at intervals along the cylinder row, and all the gels are tightened with a substantially uniform tightening axial force. In such engines, the cylinder block is deformed due to the axial force of the melt tightening, resulting in poor airtightness due to distortion in the cylinder part, uneven wear of the piston and cylinder, and damage caused by the cylinder block and cylinder head being placed between the cylinder block and cylinder head. Pressure is applied to prevent airtightness caused by local compression of the gasket.

The purpose of this research is to eliminate such gaps in conventional multi-cylinder engines.The main feature of this melting process is that the axial force of gel tightening is applied to both ends of the cylinder row, and the center of the cylinder row is The side is smaller than the friend. To reduce the tightening axial force of gel on both ends, set the tightening torque to the center i1
Either make the bolts smaller than the melt, or apply lubricating oil to the center [& bolts while tightening all bolts to the same torque, increase the temperature of the center bolts when tightening, or tighten the center bolts to the outside of the bolts. It is better to adopt the conventional method of increasing the diameter or decreasing the thread pitch. It is preferable that the axial force ratio of the both end side melts and the center side gelt be within 2/2, thereby making it possible to greatly reduce the key shape of the cylinder block.

Embodiments of the invention will now be described with reference to the drawings.

In the figure, the ennon 1 has a cylinder block 3 in which a plurality of cylinders 72 are formed in a row, and a cylinder head 5 placed on the upper part of the cylinder block 3 via a gasket 4. 5 is connected to the cylinder block 3 by a plurality of bolts 6. 'As shown in Fig. 2, the gelt 6 is attached to the cylinder block 3.
On both sides of 0, the cylinders are spaced t along the column direction of 72.
There are four locations. A jacket 7 for cooling water is formed in the cylinder block 3, and due to the -4 relationship of the block 3, the gel 6 is arranged in the middle of the cylinder 72 and at both ends of the 7-cylinder block 30. In such a structure, the gel 6 was conventionally tightened so that the tightening axial force of the gel 6 was almost uniform, but in this tightening method ↑・1, As shown by the imaginary line in Figure 3, the cylinder block 3 is deformed,
The planar shape of the cylinder 72 results in an axis that is distorted into an elliptical shape, as shown by the imaginary line 2a in FIG.

In the present invention, the tightening axial force of the bolt 6 is
Make sure that the gel 6 on the side is smaller than the gel on the center side. It is preferable that the tightening axial force of the gels 6 at both ends is mf equal to or slightly larger than that of the center side. In this way, by creating a difference in the tightening axial force of the gel 6, it is possible to alleviate the above-mentioned deformation of the cylinder block 3, and to prevent airtightness and deviation of the piston and cylinder due to the deformation. The problem can be improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a multi-9L cylinder work/non to which the present invention is applied, and FIGS. 2 and 3 are a plan view and a side view showing deformation of the cylinder block. 2...Cylinder there, 3...Cylinder block, 4...Gasket, 5.../S/D head, 6...Tighten H&Rt. Patent applicant: Toyo Kogyo Co., Ltd. Figure 1

Claims (1)

[Claims] A cylinder head is placed on top of a cylinder block having cylinders arranged in a row via a gasket,
In the mounting structure of the cylinder block and cylinder head in a multi-cylinder engine in which the cylinder block and cylinder head are connected through a plurality of cylinders arranged at intervals along the cylinder row, the tightening axial force of the gel is applied to the cylinder row at both ends of the cylinder row. A mounting structure for the cylinder block and cylinder head in a multi-cylinder engine, which is characterized by being smaller than the fire side.