JPS58160507A - Valve apparatus for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce the facial pressure of a cam etc. and reduce the dimension of a valve apparatus by allowing the spring force of a valve spring to be set weak, by reducing the inertial mass of the part which operates when a valve is opened or closed. CONSTITUTION:On an intake and exhaust valve 11, a plurality of a spherical concaved parts 14 are formed in the circumferential direction at equal intervals at the upper edge part of a valve stem 11a, and each spherical locking member 18 is installed in each of them. Said locking member 18 is fitted in the state where a part of the spherical part is closely attached onto the concaved part 14 described in the above, and inscribed on the inner peripheral surface of the cylindrical part 15a of an upper retainer 15, and the fitted state with the concaved part 14 is retained. Therefore, the notch effect can be lightened, in comparison with the conventional locking groove formed over the whole periphery of the valve stem 11a, and the axis line of the valve stem 11a can be reduced down to the degree of the diameter of the conventional locking groove.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loop device K (for intake and exhaust of an internal combustion engine).
41IK Modification of the pulp spring mounting structure IILK
related.

$1111, 21i1 indicates a conventional pulp guide, in which the intake and exhaust pulp 1 has a valve stem 1- slidably inserted into a pulp guide 3 fixed to the cylinder head 2, and a lower retainer 4 and an upper retainer 6. A pulp spring 6K is compressed and disposed between the valve and the valve, so that it is always biased in the valve closing direction. Here, the upper retainer 6
In order to attach the upper end WIAK of the v-pulp stem 1s, a so-called collet type structure is generally adopted. this is,
The upper retainer 6 has a tapered hole 7 that becomes smaller in diameter toward the bottom.
When forming a through-hole through the pulp stem 1 and 4, the top 111 of the pulp stem 1.
1! A locking groove is carved in all the IK stations, and as shown in Figure IIa, a round cylindrical fret divided into two parts is used, which has a tapered outer part 1IIIv and an inner part mK protrusion 115-. , the upper retainer 6v pulp stem 1@
It is a structure that is fixed to.

However, in such a conventional configuration, it is necessary to set the axis 1iv of the pulp stem 1- considerably large in consideration of the notch effect V caused by the locking part, and in addition, the weight of the upper retainer 6 and collet e increases. However, the disadvantage of this system is that the inertial mass of the moving parts is extremely large. Therefore, a strong pulp spring is required, and the strength of each part such as the rocker arm must be increased accordingly.

The present invention was made in view of the above-mentioned drawbacks of the conventional art, and its purpose is to reduce the inertial mass of a pulp apparatus by making it possible to reduce the diameter of the pulp stem and increase the weight of the upper retainer portion. @The goal is to destroy it.

That is, the pulp device for an internal combustion engine according to the present invention includes a pulp having a plurality of spherical recesses formed in the upper end 11 of a pulp stem, and a cylinder that is fitted into the pulp stem and surrounds the outer periphery of the upper end of the pulp stem. In addition to having a department,
An upper retainer with 7 langes sv supporting the upper end of the pulp spring is disposed in the recess 111 of the pulp stem, and is fitted into the recess, and the inner
It is comprised of a spherical locking member that is held as IK* and a V.

Hereinafter, this will be explained in detail based on FIGS.

In the figure, 11 is an intake and exhaust pulp, 12 is a cylinder head, and 18 is a pulp guide fixed to this cylinder head 11. For example, spherical recesses 1114 on the third side are provided at equal intervals in the circumferential direction. 16
is an upper retainer that supports the upper end of the nine valve springs 1, which are compressed, and 17 is a lower retainer that supports the lower end.This lower retainer 1) is the same as the conventional one, but the upper retainer 16 is made of a steel plate. The pulp stem 116 is formed by press molding, and a 1111118g is formed to protrude downward from the 75-inch 18- so as to surround the outer cylinder at the upper end of the pulp stem 116. The above cylinder 1111$a is
The inner diameter of K is set so as to form a predetermined gap between it and the outer surface of the pulp stem 116, and its lower end is narrowed to a diameter that is slightly larger than or almost in contact with the pulp stem 11. There is.

A spherical engaging member 18 is disposed in each of the spherical recesses s14 of the pulp stem 11g.

This locking member 18 has a portion of its spherical surface that fits into the shape 11 that is substantially in close contact with the recess 14, and the upper retainer 160
As shown in FIG. 5, the inner surface of the cylinder s16 is curved inwardly, and the state of fitting into the concave 11114 from K is maintained at 5. The locking member 1m is made of high-strength chrome bearing steel or the like that is resistant to seizure and wear. In addition, in this actual example, an R hole is provided at the lower end of the inner circumference of the simple 111, and each locking member 10 is further tightened inward by the spring force of the pulp spring 16.
It has become.

The upper retainer 16 and the locking member 1 are attached to the valve stem 11. To assemble K, in the same way as the conventional collet type, first place the pulp spring 1, then insert the upper retainer 151v pulp stem u and Kfl, and then attach the pulp to '5 as shown in T-gas. The locking member 1 is pressed down against the spring force of the spring 1.
81v is pulled by fitting it into the recess 14 of the pulp stem 118. From then on, the locking member 1a is held by the spring force of the pulp spring 1, and this locking member 111! Upper retainer 16 and pulp stem No. 11 are connected through 1ltlK.
It is fixed.

In a pulp apparatus configured as described above.

Since it is sufficient to form three spherical recesses 1114V as recesses necessary for the pulp stem 11 and upper aS, the notch effect is significantly greater than that of a conventional locking groove formed over the entire circumference of the pulp stem 11a. As a result, it is possible to reduce the shaft diameter of the pulp stem 11 to about the diameter of the conventional locking groove portion. Therefore, the weight of the FB, #P air pulp 11 can be significantly reduced. Also, in the upper retainer 1a portion, a collet is not used as in the conventional case.
Moreover, since the upper retainer 16 is made of a steel plate, it can be made lighter than a conventional forged product. In other words, it is possible to reduce the inertial mass of the moving part as a relief system, and as a result, it is possible to set the spring force of the pulp spring 16 weakly, and the base diameter and spring diameter of the pulp spring 16 can be reduced, and the installation length can be reduced. 1 *
1111a, and the pulp WtIII can be made smaller. Furthermore, the surface 8E at the contact portion such as the cam is also relaxed.

As is clear from the above explanation, in the pulp device for an internal combustion engine according to the present invention, the inertial mass of the part that operates when opening and closing the pulp is smaller than that of the conventional pulp device.
As a result, the spring force of the pulp spring can be set to a weak value, which has the advantage of reducing the rR8E of the spring and reducing the size of the pulp spring.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a conventional pulp stem, Fig. 2m is the same as above, and Fig. 3 is a perspective view showing only the collet. 11 is a cross-sectional view showing an example of pulp ii* according to the present invention, FIG. 1115 is a top view of the same, and FIG. 6 is an explanatory view showing the assembly procedure of this pulp am. 11...a Exhaust fi Hull y', 11g,... Valve stem, 12... Cylinder head, 14... Ball I
I-down concave portion, 16...Upper retainer, 16a...Cylinder portion, 16h...7 Lange portion, 16...Pulp spring, 18...Locking member. Figure 4

Claims (1)

[Claims] (1) A pulp having a plurality of spherical recesses formed in the upper end 11 of the pulp stem, and a pulp inserted into the pulp stem,
It has a cylinder 1llv surrounding the outside IIv of the upper end of the pulp stem, and a retainer with a 7-rank part that supports the upward direction of the pulp spring, and a retainer that is disposed in the recess 11 of the pulp stem, and is fitted into the recess WAK. A pulp device for an internal combustion engine, comprising a spherical locking member that is fitted and held within the sleeve.