JPS58150011A - Valve device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To realize alleviation of inertial mass and reduce the cost by fitting a valve spring through utilization of an upper retainer provided with a through hole on a valve stem and an annular recessed part surrounding said hole on its upper face, and a stopping ring formed flat and annular. CONSTITUTION:An upper retainer 5' is provided with a through hole 11 on a valve stem 1a and an annular recessed part 12 surrounding said hole 11 on the upper face, and also a thinned part 13 at the bottom for weight reduction. On the other hand, a stopping ring 14 used in place of a conventional collet is formed flat and annular and further divided into halves, for example, and, in the condition of assembling halved parts with each other, the outer peripheral end 14a is engaged with the inner periphery of the recessed part 12 of the upper retainer 5', while the inner peripheral end 14b is engaged with a stopping groove 8' of the end part of the valve stem 1a. Thus, a valve spring 6 is first fitted to the valve stem 1a, and then the upper retainer 5' and the stopping ring 14 are installed in order, subsequently the valve stem 1a being fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake and exhaust valve device for an internal combustion engine.
% related to improvements in the hollow structure of pulp springs.

FIG. 1.2 V shows a conventional two-position pulp system, in which the intake and exhaust pulp 1 has a pulp guide 3VC valve stem 1a fixed to the cylinder head 2 slidably inserted therein, and a lower retainer 4 and an upper A pulp spring 6 with a pressure shoe arrangement 5 provided between the retainer 5 and the retainer 5 is used to keep the valve in the valve closing direction at all times. Here, in order to attach the upper retainer 5 to the upper end portion of the pulp stem Ia, a so-called collet type structure is generally adopted. This t-tFi, the taper hole 7 which becomes smaller in diameter toward the lower part of the upper retainer 5 is a, t.
% to the shadow-forming Totomo, 1 at the upper end of the pulp stem Iph.
A cylindrical collet 9 is used, which has a thread IE groove 8 carved therein, and which has a tapered outer circumferential surface on the right and a protrusion 9a formed on its inner circumferential surface, as shown in FIG. The structure is such that the upper retainer 5 is fixed to the valve stem 1aK so that the engaged state of the protrusion 9a and the locking groove 8 is maintained by the tightening action of the tapered hole 1.

However, in such a conventional configuration, the weight of the upper retainer 5 and the collet 9 is large, making the inertial mass of the valve train larger than necessary. Therefore, a strong valve spring 6 is required, and the strong electric current of each part of the rocker arm must be increased accordingly.

Further, the collet 9 is precisely manufactured and has its tapered surface etc. polished, which has the drawback of being expensive.

This invention was made in view of the above-mentioned drawbacks of the conventional valve device, and its purpose is to reduce the inertial mass of a valve device and to simplify the structure to reduce its cost. be.

That is, the valve device for an internal combustion engine according to the present invention includes an upper retainer having a through hole through which the valve stem passes and an fp-shaped recess surrounding the through hole formed on the upper surface, and an outer peripheral end of the upper retainer having the annular recess. In addition to fitting into the
A locking ring whose inner circumferential end engages with a locking groove at the end of the valve stem and is divided into a plurality of parts, and a retainer wire is disposed between the upper retainer and the lower retainer. It is equipped with a valve spring.

Hereinafter, one embodiment of this invention will be explained based on Figures 4 to 6. I will clarify. Incidentally, the same parts as those in the conventional example described above are given the same reference numerals, and redundant explanations will be omitted.

In this valve device, the upper retainer 5' has a through hole 11 through which the valve stem Ia can pass, an annular recess 12 surrounding the through hole 11 is formed on the upper surface, and a lightweight A hollowed-out portion 13 is provided for the purpose of increasing the size. 14 is a locking ring disposed in place of the conventional collet lock, which has a flat annular shape;
And, as shown in Figure @6, it has a shape that is divided into two parts, for example. When the two halves are assembled together, as shown in Fig. 4.5, the outer circumferential end 141L is the concave part of the upper retainer 5'! 2, and the inner peripheral end 14b is relatively tightly fitted to the inner circumference of the pulp stem 1.
! It is adapted to be relatively tightly engaged with the locking groove 8' at the L end. In order to reduce the notch effect, the locking groove 8' has a substantially U-shaped cross section with a radius, and correspondingly, the inner peripheral end 14b of the locking groove 14 is also rounded. R
has been granted.

To attach the upper retainer 5' and stop ring 14 to the valve stem 1a, first place the valve spring 6, then attach the upper retainer 5' to the valve stem 1a in the same manner as the conventional collet type. If the locking ring 14 is inserted into the locking groove 8' of the valve stem 1a while being pushed down slightly against the spring force of the valve spring 6, the valve spring 6 will be inserted after JL<, U. Since the latch 14 is held within the annular recess 12 by the spring force, the valve stem Ia will not come out.

According to the valve device configured as described above, the thickness of the upper retainer 6' in the axial direction can be made thinner, and since the thickness of the center part becomes a problem, as the thickness of the upper retainer 6' is provided with the hollowed part brocade, this upper retainer 6' can be made thinner. The weight of the retainer 5' and the locking ring 14 can be significantly reduced compared to the weight of the conventional upper retainer 5 and collet 9.

Furthermore, the locking ring 14 has a feed line shape compared to the conventional collet 9, and can be formed easily and at low cost. By forming the locking ring 14 into a straight annular shape in this way, it is easy to provide the inner circumferential end 14bKR, and as described above, the locking groove 8' of the valve stem 1a can be easily provided. The notch effect can be reduced by making the cross section substantially U-shaped. As a result, the shaft diameter of the valve stem 7a can be reduced, and the inertial mass of the valve train can be further reduced.

As is clear from the above description, in the valve device for an internal combustion engine according to the present invention, the cost can be reduced without using a tapered collet, and the inertial wrinkles of the valve device can be reduced compared to the conventional valve device. As a result, the spring force of the valve spring can be set to be stronger, and it is suitable for increasing the speed of drinking.

[Brief explanation of the drawing]

1FI is a sectional view showing a conventional valve device, FIG. 2 is a top view of the same, FIG. 3 is a perspective view showing only the collet, and FIG. 4 is a side sectional view showing an example of the valve device according to the present invention. , FIG. 5 is a top view of the same, and FIG. 6 is a perspective view showing only the locking ring. I...Intake and exhaust valve, 1a...Valve stem, 4...
・Lower retainer, 5′・・Upper retainer, 6・・Nokuru spring, 8′・・Hatching groove, #2・Annular recess,
14...Latching ring. Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) An upper retainer having a through hole through which the pulp stem passes and an annular recess surrounding the through hole is formed on the upper surface, and the outer peripheral end fits into the annular recess Kid, and the inner Ii! The 6th end is the pulp stem end I):
# forms a flat ring that engages Il, and nl, P! ,
A pulp device for an internal combustion engine, comprising a locking ring divided into two parts, and a pulp spring compressed and disposed between the upper retainer and the lower retainer.