JPH021444Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention provides a hole surrounding the push rod in each lateral protrusion of the cylinder head and cylinder block.
The present invention relates to a fixing mechanism for a push rod guide in an internal combustion engine in which the upper and lower ends of a cylindrical push rod guide are respectively fitted into both holes.

(Prior Art) In FIG. 1, which shows a longitudinal section, concentric holes 3 and 4 are provided in the side projecting portion 1a of the cylinder head 1 and the side projecting portion 2a of the cylinder block 2, respectively. A push rod 5 passes through both holes 3 and 4, and a cylindrical push rod guide 6 surrounding the push rod 5 extends through the hole 3 up to the flange 7 at its upper end.
The lower end is fitted into the hole 4 and sealed by an O-ring 9, and the flange 10 provided on the outer periphery of the guide 6 slightly above the hole 4 and the side of the block A spring 11 is compressed between the projecting portions 2a to maintain the position of the push rod guide 6. Hole 3 communicates with the upper valve arm chamber 12, and hole 4 communicates with the oil pan (not shown).
is connected to. However, according to the conventional structure described above, since the spring 11 is exposed to the outside,
In marine engines, the spring 11 is damaged by seawater.
will corrode and cause damage. Also spring 11
Since the push rod guide 6 is inserted into the outside of the push rod guide 6, the diameter of that part increases, making it difficult to get the push rod guide 6 close to the fuel injection pump 13 as shown in Fig. 2, especially in multi-cylinder engines. This increases the cylinder pitch, which impedes the ability to make the engine more compact.

(Purpose of the invention) The purpose of the invention is to prevent corrosion and damage to the spring and to reduce the cylinder pitch.

(Structure of the invention) The invention provides a hole surrounding the push rod in each side protrusion of the cylinder head and cylinder block.
In an internal combustion engine in which the upper and lower ends of a cylindrical push rod guide are fitted into both holes, a coil spring installed in one hole presses the push rod guide against the stepped portion of the other hole. This is a push rod guide fixing mechanism characterized by the following.

(Example) In FIG. 3, the same symbols as those in FIG. 1 indicate corresponding parts. The cylinder head overhang 1a is provided with an inclined as-cast hole 15 and a vertical hole 15a machined parallel to the center of the cylinder at its lower end. The upper ends of the two are fitted and sealed by an O-ring 17. Further, a spring 11 is compressed between the upper end surface of the push rod guide 16 and the stepped portion 18 between the holes 15 and 15a.
6 is biased downward. The cylinder block overhang 2a is provided with a machined vertical hole 19 and a step 20 at its upper end.The lower end of the push rod guide 16 is fitted into the hole 19.
An O-ring 22 is interposed between the flange 21 that is integral with 6 and the stepped portion 20.

The lubricated valve arm oil in the valve arm chamber 12 flows through the holes 15 and 1.
5a, passes through the push rod guide 16, passes through the hole 19, and is discharged to the oil pan. The push rod guide 16 is sealed against the holes 15a and 19 by O-rings 17 and 22, and is sealed against the holes 15a and 19.
It is pushed downward by a spring 11 disposed within 5a and held in the illustrated position.

The fixing mechanism of the push rod guide 16 shown in FIG.
It can also be placed inside.

(Effects of the invention) According to the invention, since the spring 11 is disposed in the hole of the cylinder head 1 or block 2,
There is no fear that the spring 11 will be corroded by seawater or the like, and the cause of damage is eliminated. Further, since the coil spring is not exposed on the outside of the push rod guide 16, that part becomes thinner, the cylinder pitch can be shortened, and the engine can be made more compact.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view showing the prior art, FIG. 2 is a view taken in the direction of the arrow in FIG. 1, and FIG.
The drawing corresponding to the figure, FIG. 4, is a side view of the whole. DESCRIPTION OF SYMBOLS 1... Cylinder head, 1a, 2a... Lateral projecting part, 2... Cylinder block, 5... Push rod, 11... Coil spring, 15, 19
...Hole, 16...Push rod guide, 18...
...Danbe.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine in which a hole surrounding the push rod is provided in each side protrusion of the cylinder head and cylinder block, and the upper and lower ends of the cylindrical push rod guide are respectively fitted into both holes, one of the holes is fitted with a hole surrounding the push rod. A fixing mechanism for a push rod guide, characterized in that a coil spring presses the push rod guide against the stepped portion of the other hole.