JPH018646Y2 - - Google Patents

Description

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

Conventionally, guide lifters for slidably mounting latching adapters that convert engine cam rotation into linear motion and transmitting the same to the rocker arm have been manufactured by die-casting from aluminum alloy and communicated 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 lash adapter tends to change or bend in the longitudinal direction during use, making the movement of the lash adapter difficult.

In order to prevent dimensional changes and bending due to such residual strain, it is conceivable 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 by forming a knurled portion on the outer periphery of the pipe member, the pipe member and the die-cast alloy are firmly fixed to each other.

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 from the cylinder head 1. An exhaust valve 8 is integrally formed at the tip of the valve rod 6, 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 cylinder head 1 by tightening bolts 13.
A lash adapter 4 is installed on the left side of the guide lifter 12.
The aluminum block of the guide lifter 12, which has a pipe member 14 as a core material, which is partially shown by a broken line, is positioned in a direction orthogonal to the mounting direction of the lash adapter 4, and the pipe member 14 It is assembled in a position displaced to the right side from the folding hole of the adapter 4, and the lash adapter 4 and the pipe member 1
4 is used as a supply oil path for lubricating oil to the lash adapter 4.

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.

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, and the supply oil passage 15 formed by the pipe member 14 is formed at the left end of the pipe member 14 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 is an axial cross-sectional view showing the pipe member 14 used as the core material of the guide lifter 12 shown in FIG. 2, and the chain double-dashed line indicates the position where the lash adapter is machined.

In the pipe member 14 shown in FIG. 5, a knurling portion as shown in FIGS. 6, 7, or 8 is formed on the pipe outer circumferential portion 22 excluding the machining position of the adapter mounting hole 18. In addition, the knurling part is located at 1 to 1 from the processing position of the adapter mounting hole 18.
By providing the knurled portions at a distance of about 3 mm, the knurled portions are not exposed on the inner surface of the adapter mounting hole 18, and damage to the knurled portions is prevented.

FIG. 6 shows lattice-like knurling portions 2 formed in a lattice shape on each of the outer circumferential portions 22 of the pipe member 14 except for the processing positions in the adapter mounting holes 18 shown in FIG.
In addition, in FIG. 7, parallel knurling portions 25, which serve as grooves parallel to the axis, are formed on each of the outer peripheral portions 22 in FIG. The figure shows the pipe member 14 shown in FIG. 5 in which a circumferential knurled portion 26 having continuous grooves in the circumferential direction is provided on each of the outer peripheral portions 22 of the pipe member 14 shown in FIG.

As shown in FIGS. 6 to 8, the pipe member 14 has the lattice knurling portions 24, the parallel knurling portions 25, or the circumferential knurling portions 26 formed at positions other than the adapter mounting holes 18 on the outer periphery of the pipe member 14. was set in the mold of a die-casting machine as the core material of the guide lifter 12, and the aluminum block 1 having the shape shown in FIG. 2 was formed by die-casting the aluminum alloy.
6, and then the blind hole of the adapter mounting hole 18 formed along the penetration part of the pipe member 14 is drilled and polished to form the adapter mounting hole 18. A lifter 12 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, as shown in FIGS. 6 to 8, since a knurled portion is formed on the outer periphery of the pipe member 14 incorporated as a core material, when the aluminum block 16 is die-cast on the outside of the pipe member 14, The pipe member 14 is firmly fixed to the pipe member 14, and the pipe member 14 does not move when machining the adapter mounting hole 18, or the aluminum block 16 that forms the guide lifter due to temperature changes during use when assembled to the cylinder head. It is also possible to reliably prevent only the adapter 14 from moving and protruding into the inner periphery of the adapter mounting hole 18, thereby causing gouging with 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.

Regarding the knurling portion on the outer periphery of the pipe member 14 shown in FIGS. 6 to 8, it is desirable to form the parallel knurling portion 25 shown in FIG. 7 in order to prevent the pipe member 14 from rotating. In order to suppress the movement of the member 14 in the axial direction, the eighth
It is desirable to form the circumferential knurled portion 26 shown in the figure, and furthermore, to restrict the rotation and axial movement of the pipe member 14, it is desirable to form the grid-like knurled portion 24 shown in FIG. Alternatively, the knurling portions formed on the outer periphery of the pipe member 14 may be formed by appropriately combining grid-like, parallel or circumferential knurling portions 24, 25, and 26 shown in FIGS. 6 to 8. good.

Next, to explain the effects of the present invention, since the block of the guide lifter is formed by die-casting using the pipe member as the core material, the rigidity in the longitudinal direction is 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. .

In addition, since a knurled portion is formed on the outer periphery of the pipe member used as the core material, excluding the processing position of the lash adapter, it is possible to prevent the pipe member from adhering to the block body die-cast on the outside of the pipe member. By making it strong, it is possible to reliably prevent the pipe member embedded as a core material from shifting relative to the block body even if expansion and contraction due to temperature changes or vibrations are 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. Figure 5 is an axial cross-sectional view showing a pipe member used as a core material in the present invention, and Figures 6, 7, and 8 are knurlings formed on the outer periphery of the pipe member used in the present invention. It is an explanatory view of an engraving part. 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, 24:
25: Parallel knurling part; 26: Circumferential knurling part.

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. In a guide lifter for an internal combustion engine for a vehicle, a block of the guide lifter is formed by die-casting using a pipe member as a core material, and knurling is carved on the outer circumferential surface of the pipe member at a portion other than the processing position of the mounting hole for the lash adapter. A guide lifter for a vehicle, characterized in that a guide lifter is formed with a section.