JPS58160506A - Valve apparatus for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce the valve setting noise which forms a part of engine noise by reducing the valve movement speed when a valve is set on its seat, thus preventing sharp collision between the valve head part and a valve seat. CONSTITUTION:When an intake and exhaust valve 1 is opened, a valve stem 1a freely slides in a brake sleeve 11, and the brake action is not effective at all. when the intake and exhaust valve 1 shifts in the valve closing direction, the brake sleeve 11 is driven upward by the frictional force between the valve stem 1a and the brake sleeve 11, and the outer peripheral surface 11a is attached under pressure onto the seat 13 of a brake guide 12, and the brake sleeve 11 is tightened in the inner peripheral direction, and the opening diameter is reduced to tightly press the valve stem 1a, which is gently seated with its deceleration speed. Therefore, the impact generated on seating and the resulted seating noise can be reduced.

Description

[Detailed description of the invention] The present invention relates to a pulp device for intake and exhaust of an internal combustion engine.

Figure 1 shows an example of a conventional pulp packaging fjIt〇.
The intake and exhaust pulp l made of poppet is fixed to the cylinder head 2, the pulp stem 1 is slidably inserted into the companion pulp guide i, and is compressed and disposed between the lower retainer 4 and the upper retainer 5 to produce good pulp. It is always biased in the valve closing direction by a spring 6. Then, the head is seated on the valve seat 7 due to the biasing force of the cylinder, and the cam moves downward in the figure only when the cam directly or presses the valve stem end 9, and becomes the authority to open the intake and exhaust port 8. ing.

However, in this conventional configuration, as is well known, when the pulp 1 is seated, the head portion 1b is centered on the valve seat 7, and this impact induces surface vibration of the cylinder head 20, so-called It has the disadvantage of producing pulp seating noise. In order to reduce this seating noise, the cam profile has been changed to
However, the full effect has not yet been achieved.

This invention was made in view of the above-mentioned drawbacks of the conventional butterfly.
The purpose is to prevent the sudden collision*1 between the pulp head and the valve seat and reduce the pulp seating noise that is part of the engine snow melting, by setting the valve crawling speed 1Lt to be slow when the pulp is seated.

That is, the pulp system of the internal combustion engine according to the present invention is provided with nine valves that are movably arranged in the cylinder head of the internal combustion engine, a pulp spring that always biases the pulp in the valve-closing direction, and a pulp stem. A brake sleeve that is slidably inserted and has at least one end of its outer circumferential surface tapered and whose diameter can be made smaller is identified as a cylinder head. The brake guide is provided with a brake guide formed therein for tightening the armpit spray sleeve in the inner circumferential direction when the brake sleeve moves in the pulp valve closing direction.

Below, I will explain one example of this @- in detail.
S! I will clarify. In the following embodiments, parts that are not particularly different from those in the conventional example described above are given the same reference numerals, and redundant numbers are omitted.

In FIG. 2, numeral 11 is a brake sleeve inserted into the pulp stem IILK of the intake and exhaust valve 1, numeral 12 is a brake guide in which this play sleeve 11 is installed,
As shown in Fig. 4 of the brake sleeve IIFi mentioned above, the outer circumferential surface 111 is formed into a cylindrical shape with a tapered shape, and a part of it is cut with a 11 k, so that its diameter is elastic. In general, it is possible to make small changes. 1kjP% slit like jin 11 b
Even if the brake sleeve 11 is not formed, it is possible to form the brake sleeve ilt@ from an elastic body whose diameter can be expanded and contracted.The inner diameter of this brake sleeve 11 is normally approximately equal to the diameter of the pulp stem la. , is in good condition and is in movable contact with the outer periphery of the valve stem 11. On the other hand, the cylinder part 1 surrounding the brake guide 12 and the outside of the pulp guide 3
2&, the lower end of the pulp spring 60 (supporting spring seat portion 12m), and is fixed to the cylinder head 2 by the urging force of the pulp spring 6, and as shown in No. 3-, the cylindrical portion 121 The inner circumference of the upper end portion has a tapered nine seat portion 13 similar to the brake sleeve 11, and the brake sleeve 11 is disposed so as to be slidable by a predetermined stroke between the seat portion 13 and the upper end of the pulp guide 3. ing. A small hole 14 is provided in the lower part of the cylindrical portion 12a for discharging the lubricating oil t# that has flowed into the brake guide n. It prevents it from collapsing.

Now, #5Ii1 as above. In Ilc, when the intake and exhaust pulp 1 opens the valve, the pulp stem 1 moves downward in the figure (in the direction of the second arrow).
& is the brake sleeve 11 fi [-free KmlI, and no braking action is performed. However, when the intake/exhaust pulp 1 moves upward from the valve-opening state in the valve-closing direction, the sleeve 11 also moves upward due to the frictional force between the pulp stem 1a and the brake sleeve 11. , its tapered outer circumferential surface 11 & is pressed against the seat 13 of the brake guide 120. As a result, the brake sleeve 11 is tightened in the inner circumferential direction, and its diameter is reduced. (Press firmly on the lupus stem 1&. Therefore,
I moved upward in the diagram due to the force of the pulp spring 60
At the end of its movement stroke, the IL# air valve 1 receives a brake action through the oil due to the pressure of the brake sleeve 11 just before it seats on the lub seat 7, and its speed decreases and it slowly seats. do.

The impact generated when the vehicle is seated at the 9th position and the noise caused by the 9th seating become extremely small. Moreover, since the braking action by the brake sleeve 11 increases as the interlocking speed of the intake and exhaust pulp 1 increases, it is possible to reliably and effectively suppress pulp seating noise even when rolling at high speed.

In addition, it is set appropriately depending on the movement stroke expansion of the brake sleeve 11 regulated by the seat part 13 and the upper end of the pulp guide 3, and its inclination force in the taper direction, but generally it is within a range of the valve lift amount h or less. You can get a great effect.

In addition, an embodiment is shown in which a part of the gsaa brake sleeve 11 and the brake guide n are changed.
1' is formed in a tapered shape, and the seat part 13' of the brake guidetle is formed in a layered shape with a relatively narrow width (r). This embodiment has the advantage that these taper processes make it a better product compared to the above embodiments.

Although not shown in the drawings, it is also possible to create a substantially spline-like concave *t on the outer circumferential surface of the brake sleeve 11 to facilitate elastic deformation of the brake sleeve 11.

As is clear from the above explanation, in the pulp device for an internal combustion engine according to the present invention, the valve speed f when the pulp is seated can be reduced and the valve seat can be seated gently. It is possible to significantly reduce the noise caused by the impact of time, so-called pulp seating noise.

[Brief explanation of the drawing]

FIG. 1 is a cross-section N1 showing a conventional pulping device. FIG. 2 is a sectional view of a pulping device according to the present invention, FIG. 3 is an enlarged sectional view of its main parts, FIG. 4 is a perspective view of its brake sleeve, and FIG. FIG. 5 is a cross-sectional view of only the landscape part showing a different embodiment of the present invention. 1.a exhaust pulp, 2... cylinder head, 3...
Balhukai)', 6-...Pulp Spring, 7...
Valve seat, 11-... Brake sleeve, 12...
- Brake guide, 13, 13' - Seat. Figure 1 1r ]O Figure 2 Figure 3 11t)

Claims (1)

[Claims] (1) Nine pulps that are slidably disposed in the cylinder head of the internal combustion engine III, a pulp spring that always biases the pulp pipe in the valve-closing direction, and a pulp stem that is slidably inserted into the pulp stem and its outer circumferential surface. A brake sleeve whose at least one end is tapered and whose diameter can be reduced; and a cylinder head 儒K11JI! The brake sleeve is internally slidable in a certain direction, and a ninth seat is provided to tighten the scissor brake sleeve in the inner circumferential direction when the brake sleeve moves in the pulp valve closing direction. A pulp device for an internal combustion engine comprising a brake guide having a shape of Mt and a shape of T.