JPH03168351A - Cylinder head mounting device to aluminum alloy cylinder of engine - Google Patents

Abstract

PURPOSE:To keep high output performance of an engine by externally protruding a female screw hole forming flange from the end of the upper dead point of a cylinder liner, and by screw-fitting the leg end of a head bolt in the female screw hole formed on the female screw hole forming flange. CONSTITUTION:A cylinder head 6 is assembled on the upper part of an aluminum alloy cylinder 2 by a mounting device 18. A cylinder liner 4 is fitted into an fixed to a cylinder barrel 3 of the cylinder 2, and the head 6 is fastened and fixed to the cylinder 2 by a head bolt 7 through a gasket 5. A female screw hole forming flange 9 is externally protruded from an end 9 on the upper dead point side of the cylinder liner 4, while a leg end part 11 of the bolt 7 is screw-fitted to a female screw hole 10 formed on the flange 9, so as to eliminate the room for increasing a distance 16 form a bolt head part 14 to the end 8 of the upper dead point side of the cylinder liner 4, due to the fastening force of the bolt 7. Shutoff pressure of the gasket 5 is not decreased thereby, and the output performance of a engine can thus be kept to a high level.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for mounting a cylinder head to an aluminum alloy cylinder of an engine.

[Basic Structure] The basic structure of a device for mounting a cylinder head to an aluminum alloy cylinder of an engine, which is a premise of the present invention, is as follows.

For example, as shown in FIG. 1, FIG. 2, or FIG. 3, a cylinder liner 4 is fitted and fixed in the cylinder barrel 3 of an aluminum alloy cylinder 2 of an engine 1, and a cylinder liner 4 is inserted into the cylinder 2 through a gasket 5. It is constructed by tightening and fixing with a head bolt 7.

[Prior Art] In the above basic structure, the specific structure of the mounting device is as follows:
Conventionally, there is one shown in FIG.

This is constructed by threadingly fitting the ll11 end 11 of the hesode port 7 into a female threaded hole 10 formed in the upper surface 13 of the wall portion of the cylinder body 12.

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Therefore, the above-mentioned conventional technology has the following problems (1) and (2).

■The upper surface l3 of the flesh wall part l2 of the cylinder body l2 of the soft aluminum alloy cylinder 2 is deformed into a raised shape by the tightening force of the head bolt 7, and the bolt head of the hesod bolt 7 is moved upward by the amount that the entire head bolt 7 is moved. Distance l6 from part l4 to top dead center side end 8 of cylinder liner 4 is distance l7 before deformation.
, the shutoff pressure of the gasket 5 between the cylinder liner 4 and the cylinder head 6 decreases, and the output performance of the engine decreases.

(2) Since the mounting position of the head bolt 7 is separated from the cylinder liner 4, the shape of the cylinder 2 and the cylinder throat 6 becomes larger.

An object of the present invention is to maintain a high shutoff pressure of a gasket between a cylinder lychee and a cylinder head, and to reduce the size of the cylinder and cylinder head.

[Means for Solving the Problems] The present invention is characterized in that, in the basic structure described above, the structure of the mounting device is as follows.

For example, as shown in FIG. 1 or FIG. 2, a female threaded hole forming flange 9 is provided to protrude outward from the top dead center side end 8 of the cylinder liner 4, and a female threaded hole 10 formed in the female threaded hole forming flange 9 is provided. The leg end 11 of the head bolt 7 is screwed into the leg end 11 of the head bolt 7.

[effect] The present invention provides the following effects (1) and (2).

■There is no room for the distance from the head of the head bolt to the top dead center end of the cylinder liner to increase due to the tightening force of the head bolt, so the closing pressure of the gasket between the cylinder liner and the cylinder head decreases. This allows the engine to maintain high output performance.

■Since the head bolt is integrally attached to the cylinder liner, space is saved and the cylinder and cylinder head can be made smaller.

[Example] Embodiments of the present invention will be described based on the drawings.

1 and 2 are diagrams illustrating a device for attaching a cylinder throat to an aluminum alloy cylinder of an engine according to an embodiment of the present invention, and FIG. 1(A) is a vertical cross-sectional front view of the attaching device;
FIG. 1(B) is a plan view of a cylinder equipped with a cylinder liner, and FIG. 2 is a longitudinal sectional front view of the engine equipped with a mounting device.

In FIG. 2, the symbol l indicates an engine.

This engine 1 is an overhead valve type diesel engine,
A cylinder head 6 and a head force bar 15 are arranged in this order on the upper part of an aluminum alloy cylinder 2, and the cylinder head 6 is assembled to the cylinder 2 by a mounting device 18.

As shown in FIG. 1(A), the mounting device 18 is
A cylinder liner 4 is fitted and fixed into the cylinder barrel 3 of the cylinder head 6 through a gasket 5 to the cylinder 2.
is configured by being tightened and fixed by a head holder 7.

The cylinder liner 4 is fixed to the cylinder barrel 3 by casting.

A female threaded hole forming flange 9 is provided to protrude outward from the top dead center side end 8 of the cylinder liner 4, and the leg end 11 of the head bolt 7 is threadedly fitted into the female threaded hole 10 formed in the female threaded hole forming flange 9. By doing so, there is no room for the distance 16 from the bolt head 14 of the head bolt 7 to the top dead center side end 8 of the cylinder liner 4 to increase due to the tightening force of the head bolt 7.

Therefore, the shutoff pressure of the gasket 5 between the cylinder liner 4 and the cylinder head 6 does not decrease, and the output performance of the engine can be maintained at a high level.

Further, since the head bolt 7 is integrally attached to the cylinder liner 4, the cylinder 2 and the cylinder head 6 can be downsized.

As shown in FIG. 1(B), the flange 9 for forming a female screw hole
are made to protrude from four locations on the top dead center side end 8 of the cylinder liner 4.

In FIG. 2, reference numeral 19 indicates a cylinder jacket, and 20
21 indicates a head socket, 21 indicates a water passage hole from the cylinder jacket 19 to the head socket 20, and in FIG. 1(B), 22 indicates a push rod insertion hole, and 23 indicates a blow-by gas and lubricating oil circulation hole. are shown respectively.

[Brief explanation of the drawing]

1 and 2 are diagrams illustrating a mounting device for a cylinder head to an aluminum alloy cylinder of an engine according to an embodiment of the present invention, and FIG. 1(A) is a vertical cross-sectional front view of the mounting device;
Fig. 1 (B) is a plan view of a cylinder equipped with a cylinder liner, Fig. 2 is a vertical cross-sectional front view of an engine equipped with a mounting device, and Fig. 3 is a view corresponding to Fig. 1 (A) of the prior art. It is. 1... Engine, 2... Aluminum alloy cylinder, 3
...Cylinder barrel, 4...Cylinder liner, 5...
・Gasket, 6... Cylinder head, 7... Head bolt, 8... End on the top dead center side of 4, 9... Female threaded hole forming flange, 10... Female threaded hole, 1l... 7 leg end.

Claims (1)

[Claims] 1. A cylinder liner 4 is fitted and fixed inside the cylinder barrel 3 of the aluminum alloy cylinder 2 of the engine 1, and the cylinder 2
In a device for mounting a cylinder head to an aluminum alloy cylinder of an engine, which is configured by tightening and fixing a cylinder head 6 with a head bolt 7 via a gasket 5, a female threaded hole is inserted from the top dead center side end 8 of the cylinder liner 4. A cylinder for an aluminum alloy cylinder of an engine, characterized in that a forming flange 9 is provided to protrude outward, and a leg end 11 of a head bolt 7 is screwed into a female threaded hole 10 formed in the female threaded hole forming flange 9. head mounting device