JPH0220407Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a guide for a vehicle internal combustion engine in which a latch adapter is slidably attached to the top of the cylinder head to transmit the rotation of the engine cam as the opening/closing movement of the intake and exhaust valves via a rocker arm. Regarding lifters.

Conventionally, guide lifters for slidably mounting latching adapters that convert engine cam rotation into linear motion and transmitting rocker arms are manufactured by die-casting from aluminum alloy and communicate with each latching adapter insertion hole. The oil supply hole is drilled in the longitudinal direction using a drill, but because the longitudinal dimension of the cylinder head is large in the direction in which the pistons are arranged, machining requires the use of a special drill and takes time. In addition, due to the influence of residual strain caused by die-casting, the longitudinal dimensions tend to change or bend during use, which impairs the movement of the lash adapter.

In order to prevent dimensional changes and bending due to such residual strain, it is possible to make the guide lifter sufficiently thick, but this increases the molding material and weight, which is not practical.

The present invention was developed in view of these conventional problems.It increases the rigidity in the longitudinal direction without increasing the wall thickness, prevents bending deformation and dimensional changes, and makes it possible to drill longer holes. An object of the present invention is to provide a guide lifter for a vehicle internal combustion engine that has an unnecessary structure.

To achieve this objective, the present invention uses a pipe member as a core material to form a guide lifter block by die-casting, and by using this pipe member as a core material, it increases the rigidity in the longitudinal direction and prevents dimensional changes due to residual strain. This prevents bending and forms minute irregularities on the outer circumferential surface of the pipe member, while at the same time hardening the surface to ensure a strong bond between the pipe member and the die-cast alloy.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is an explanatory cross-sectional view of an engine cylinder head using the guide lifter of the present invention. First, to explain the configuration, 1 is a cylinder head, and a camshaft 3 equipped with a cam 2 that is rotatably driven by a timing belt or the like is provided on the upper part of the cylinder head 1. A latch adapter 4 is connected to the cam 2. The lower end of the locker arm 5 is brought into contact with the lower end of the locker arm 5, and the reciprocating movement of the locking adapter 4 in the axial direction due to the rotation of the cam 2 is transmitted as a rocking motion of the locking arm 5.
The lower left end of the valve rod 6 is in contact with a valve rod 6, and the valve rod 6 is attached to the cylinder head 1 with a valve spring 7 interposed so that it can freely protrude and retract. An exhaust valve 8 is integrally formed at the tip of the valve rod 6, and the exhaust valve 8 Valve 8 is seated in a valve seat 10 mounted at the outlet of the combustion chamber to exhaust port 9. Further, a rocker arm 5' is provided behind the rocker arm 5 to open and close the intake valve of the same cylinder.

In the cylinder head 1 having such a structure,
The guide lifter 12 of the present invention is fixed to the upper part of the cylinder head 1 by tightening with bolts 13, and a latch adapter 4 is slidably provided on the left side of the guide lifter 12.
A guide lifter 1 equipped with a pipe member 14 as a core material, which is partially shown by a broken line in a direction perpendicular to the mounting direction of the guide lifter 1.
The pipe member 14 is installed at a position displaced to the right side from the insertion hole of the lash adapter 4, and the gap between the lash adapter 4 and the pipe member 14 is used to supply lubricating oil to the lash adapter 4. It is used as an oil route.

FIG. 2 is a plan view showing the guide lifter 12 of the present invention taken out from the embodiment of FIG. 1, FIG. 3 shows a sectional view, and FIG. 4 shows a sectional view.

That is, Fig. 2 shows a guide lifter attached to a cylinder block used in an internal combustion engine, and the outer shape of the guide lifter 12 is composed of a block 16 obtained by die-casting of aluminum alloy, and has a shape corresponding to each cylinder. A pair of adapter mounting holes 18 used for intake valves and exhaust valves are provided at three locations, and bolt insertion holes 19 are formed at four locations on both sides of the adapter mounting holes 18.

As is clear from the sectional view of FIG. 3 showing the left end of the guide block, the internal structure of the guide lifter 12 includes a pipe member 14 as a core material in the longitudinal direction.
An aluminum block 16 having the shape of the guide lifter 12 is provided on the outside of the pipe member 14 by die-casting, the open end of the pipe member 14 is closed with a blind plug 20, and an aluminum block 16 is provided on the inside of the pipe member 14. On the other hand, an inflow port 21 for supplying lubricating oil is provided downward. The structure of the left end of the guide lifter 12 shown in FIG. 3 is the same structure as the right end of the guide lifter 12 shown in FIG. It becomes an ejection port for returning the water.

On the other hand, the adapter mounting hole 18 of the guide lifter 12
As is clear from the cross-sectional view in FIG. 4, the structure of the forming part is a die-cast aluminum block 16.
The pipe member 14 which becomes the core material of the adapter mounting hole 1
8, the hollow hole of the pipe member 14 forms a supply oil passage 15 for supplying lubricating oil to the lash adapter 4, and the pipe member 14 opens from the right angle direction. The pipe hole 14 is installed so as to be slightly outside the adapter mounting hole 18, so that the supply oil passage 15 formed by the pipe member 14 is formed at the left end of the pipe member 4 without being obstructed by insertion of the dart adapter. It is designed to allow flow from the inflow port 21 to the rightmost discharge port.

FIG. 5 shows a partial cross-section of the pipe member 14 used as the core material of the guide lifter 12 shown in FIG. 2, and the two-dot chain line indicates the hole drilling position of the lash adapter.

In the pipe member 14 shown in FIG. 5, minute irregularities 30 are formed on the outer peripheral surface of the pipe.
At the same time as forming the uneven portions 30, the surface is hardened. Processing of the uneven portion 30 on the surface of the pipe member 14 is achieved by dry honing (polishing with a grindstone), shot blasting, barrel processing, etc.
Simultaneously with these treatments, work hardening of the pipe surface can also be obtained.

The pipe member 14 shown in FIG. 5, whose surface was hardened at the same time as the uneven portion 30 was formed on the outer circumferential surface, was set in a mold of a die-casting machine as a core material of the guide lifter 12, and the pipe member 14 shown in FIG. 2 was formed by die-casting an aluminum alloy. This is achieved by manufacturing an aluminum block 16 having the shape shown, and then drilling and polishing the blind hole of the adapter mounting hole 18 formed along the penetrating portion of the pipe member 14 to form the adapter mounting hole 18. The guide lifter 12 of the invention can be created.

In such a guide lifter of the present invention,
First of all, since the pipe member 14 is built-in as a core material, even if the longitudinal dimension is large, the rigidity in the longitudinal direction is high because it passes through the pipe member 14, and even if there is residual distortion due to die-casting, the guide lifter 12 does not cause any bending or dimensional change, and it is possible to reliably prevent the dart adapter 4 from moving poorly when it is assembled in the cylinder head 1 as shown in FIG.

In addition, the outer circumferential surface of the pipe member 14 incorporated as a core material is formed with minute irregularities 30 by dry honing, shot blasting, or barrel processing, and the surface is hardened at the same time. When the block 16 is die-cast, it is firmly fixed to the pipe member 14, and the pipe member 14 does not move when forming the adapter mounting hole 18, and a guide lifter is formed due to temperature changes during use when assembled to the cylinder head. It is also possible to reliably prevent only the pipe member 14 from moving with respect to the aluminum block 16 and protruding into the inner periphery of the adapter mounting hole 18, thereby causing strain on the dash adapter 4.

Furthermore, since the pipe hole of the pipe member 14 used as the core material can be used as it is as the lubricating oil supply passage 15, the lubricating oil supply passage 15 is specially formed in the longitudinal direction after die-casting the guide lifter 12. There is no need to drill long holes using a drill.

Next, to explain the effects of the present invention, since the block of the guide lifter is formed by die-casting using a pipe member as the core material, the rigidity in the longitudinal direction can be increased without increasing the wall thickness of the guide lifter. It reliably prevents dimensional changes and deflections due to residual distortion, and ensures smooth movement of the lash adapter that converts engine cam rotation into linear motion and transmits it to the intake and exhaust valves via the rocker arm. can.

In addition, because minute irregularities are formed on the outer circumferential surface of the pipe member used as a core material and the surface is hardened at the same time, the adhesion between the pipe member and the die-cast block body formed on the outside of the pipe member is strengthened, and the temperature changes. It is possible to reliably prevent the pipe member embedded as a core material from shifting in position with respect to the block body even if expansion/contraction or vibration is applied.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory diagram of a cylinder head using the guide lifter of the present invention, Fig. 2 is a plan view of the guide lifter of the present invention, Fig. 3 is a cross-sectional view of Fig. 2, and Fig. 4 is a cross-sectional view of the cylinder head using the guide lifter of the present invention. FIG. 5 is an explanatory view partially showing a section of the pipe member used in the present invention. 1: Cylinder head, 2: Cam, 3: Camshaft, 4: Lush adapter, 5: Locker arm, 6: Valve rod, 7: Valve spring,
8: Exhaust valve, 9: Exhaust port, 10: Valve seat, 12: Guide lifter, 13: Bolt, 1
4: Pipe member, 15: Supply oil path, 16: Aluminum block, 18: Adapter mounting hole, 19: Bolt insertion hole, 20: Blind plug, 21: Inflow port, 30:
Uneven parts.

Claims (1)

[Claims for Utility Model Registration] Manufactured by die-casting and fixed to a cylinder head with multiple mounting holes for a lash adapter that converts engine cam rotation into linear motion and transmits it to the intake and exhaust valves via a rocker arm. A guide lifter for a vehicle internal combustion engine, characterized in that the block of the guide lifter is formed by die-casting using a pipe member whose outer peripheral surface is formed with minute irregularities and whose surface is hardened at the same time as a core material. guide lifter.