JP2582207Y2 - Valve lifter for internal combustion engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a valve lifter in an internal combustion engine used for an automobile or the like.

[0002]

2. Description of the Related Art A conventional valve lifter for an internal combustion engine is known, for example, from Japanese Utility Model Application Laid-Open No. 63-57302, and includes a cylindrical valve lifter having a bottom wall at one end of a push rod in an intake valve or an exhaust valve. The valve lifter is fitted and held slidably on the cylinder head. A shim plate is provided on the outer wall surface of the bottom wall of the valve lifter, and a cam on a cam shaft is brought into contact with the shim plate.

As shown in FIG. 3, an inner wall surface 11a of the bottom wall 11 of the valve lifter 1 is provided with a push rod seating portion 11b at one end thereof for seating one end of a push rod (not shown). Part 1
A mortar-shaped inclined surface portion 11c is formed so as to be higher than 1b toward the side wall 12, and lubricating oil for lubricating between the valve lifter 1 and the push rod is guided to the push rod seating portion 11b.

[0004]

However, in such a valve lifter 1, a part (net-shaded portion) of the bottom 10a of the forged valve lifter rough material 10 shown in FIG.
Was cut out by machining to form a shallow bottom push rod seating portion 11b as shown in FIG. 3, and the bottom portion 10a was machined into an inclined surface portion 11c.

In addition to this, the side wall 12 of the valve lifter 1
Is formed with an oil hole 2 for draining the lubricating oil in the valve lifter 1, and the drilling position of the oil hole 2 is set at the inner wall surface in order to minimize the amount of lubricating oil in the valve lifter 1. 11
a.

Accordingly, the oil hole 2 penetrates through the side wall 12 by drilling, and also partially cuts out the inner wall surface 11a 11a1 to penetrate and penetrate into the valve lifter 1. As a result, the bottom 1 of the valve lifter
A part (netted hatched portion) of Oa is cut out to form a shallow bottom push rod seating portion 11b, and the bottom 10a is formed into an inclined surface, so that the machining allowance becomes large and the drill becomes difficult. When the bottom wall 11 is reached, the inclined surface portion 11c forms a one-sided contact due to the inclined surface portion 11c.

[0007] In view of the above, the present invention provides a valve lifter for an internal combustion engine capable of minimizing a machining allowance for drilling an oil hole, reducing breakage of a drill, and reducing a machining fee. It is intended to be.

[0008]

In order to achieve the above object, a valve gear for an internal combustion engine according to the present invention has a concave portion extending radially on an inner wall surface of a bottom wall of a valve lifter.
An oil hole formed in a side wall of the valve lifter is communicated with the recess.

[0009]

With this construction, the oil hole formed in the side wall of the valve lifter communicates with the recess formed in the inner wall surface of the bottom wall. Since there is no need for installation, there is no contact, and breakage of the drill is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The same reference numerals are used for the components corresponding to the configuration of the related art.

FIG. 1 is a plan view of a valve lifter employing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view. The valve lifter 1 is a cylindrical forged product having a bottom wall 11 and a side wall 12. . During this forging, a shallow push rod seating portion 11b for seating one end of a push rod (not shown) is formed at the center of the inner wall surface 11a of the bottom wall 11, and the inner wall surface 11a The mortar-shaped inclined surface portion 11c is higher than the push rod seating portion 11b toward the side wall 12. A concave portion extending in the radial direction from the push rod seating portion 11b and reaching the side wall 12 in the inclined surface portion 11c.
11c1 is recessed. Therefore, in the present embodiment, the valve lifter 1 shown in FIG. 3 is formed by machining the forged valve lifter rough material 10 as shown in FIG. 1 is formed.

The concave portion 11c1 is wider so as to have a diameter larger than the diameter of the oil hole 2 in order to form the oil hole 2 described later, and is reduced toward the push rod seating portion 11b. The bottom surface is a flat portion.
In this embodiment, a plurality of recesses 11c1 are provided.
For example, the valve lifter 1 is balanced so as to extend in a pair in the direction opposite to the radial direction, and the eccentricity of the inner circumference is prevented.

In the valve lifter 1 thus formed by forging, an oil hole 2 communicating with the recess 11c1 is formed in the side wall 12 by a drill or the like by machining or the like. The lubricating oil that has entered the valve lifter 1 is guided by the inclined surface portion 11c, guided to the push rod seating portion 11b, and performs a lubricating action with the push rod. , Oil hole 2
It is designed to be discharged to the outside. Oil hole 2
Is formed at the lowermost portion of the inner wall surface 11a, so that the amount of lubricating oil stored in the valve lifter 1 is controlled to a necessary minimum.

With the above arrangement, in this embodiment, when drilling the oil hole 2, the concave portion 11 provided in the inclined surface portion 11c is formed.
c1 serves as an escape groove for a drill or the like to prevent breakage of the drill and the like, and it is possible to position the oil hole 2 in the rotational direction by using the recess 11c1. Further, since the oil hole 2 can be formed by drilling only the side wall 12, drilling can be performed not only by drilling but also by forging, and furthermore, the recess 11c1 can be balanced. By arranging a plurality of oil holes 2, it is possible to easily cope with a valve lifter of a type requiring a plurality of oil holes 2.

The valve lifter 1 in the above embodiment has been described as a type in which the bottom wall 11 is used downward. However, the present invention is not limited to this, and an internal combustion engine in which the bottom wall 11 is used upwardly is used. Is also applicable, in which case
The oil hole 2 is used as a lubricating oil introduction hole.

[0016]

[Effect] The valve lifter of the present invention according to the above configuration is
A groove extending radially is formed on the inner wall surface of the bottom wall, and an oil hole is formed in the groove to communicate with an oil hole formed in a side wall of the valve lifter. In the meantime, the concave portion provided on the inner wall surface of the bottom wall serves as an escape groove for a drill, etc., thereby preventing breakage of the drill, etc.
By using this concave portion, it is possible to position the oil hole in the rotation direction. In addition, since the oil hole can be formed by drilling only the side wall, the drilling operation can be performed not only by a drill but also by forging, and therefore, a greater cost reduction can be achieved. Further, if a plurality of concave portions are arranged so as to be balanced, it is possible to easily cope with a valve lifter of a type requiring a plurality of oil holes.

[Brief description of the drawings]

FIG. 1 is a plan view of a valve lifter employing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a valve lifter employing one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional valve lifter.

FIG. 4 is a longitudinal sectional view of a forged valve lifter coarse material of the valve lifter in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve lifter 2 Oil hole 11 Bottom wall 11a Inner wall surface 11c Inclined surface part 11c1 Concave part 12 Side wall

Claims (2)

(57) [Scope of request for utility model registration] 1. A cylindrical valve lifter having a bottom wall slidably held and fitted to a cylinder head at one end of a bush rod of an intake valve or an exhaust valve of an internal combustion engine. A valve lifter for an internal combustion engine, wherein a concave portion extending in a radial direction is formed, and an oil hole formed in a side wall of the valve lifter communicates with the concave portion. 2. The method according to claim 1, wherein the recess has a diameter larger than a diameter of the oil hole.
The contract is characterized by being formed wide so that
The valve lifter for an internal combustion engine according to claim 1.