JP2642831B2 - Intake and exhaust valve rotation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent uneven wear and the like which tend to occur on a seat surface of an intake / exhaust valve in an internal combustion engine.
The present invention relates to a rotation device for an intake / exhaust valve that gives a rotational movement when the intake / exhaust valve is driven.

[0002]

2. Description of the Related Art An intake / exhaust valve of an internal combustion engine is liable to cause uneven wear, blow-by, etc. on a seat surface due to uneven heat or fuel residue during operation. For this reason, it is necessary to rotate the intake / exhaust valve to change the contact state between the seat surface and the seat ring to prevent the above-described inconvenience.

FIG. 8 shows a valve spring 100 and an upper spring support 101.
A disc spring 102 and a roller 103 are provided therebetween, and the valve rod 104 is rotated each time air is sucked and exhausted by the pressing force applied to the upper spring receiver 101 and the force of the disc spring 102.

FIG. 9 shows a valve stem 104 provided with a blade 105,
This is a device that rotates the valve stem 104 by the force of intake and exhaust.

[0005]

The apparatus shown in FIG. 8 can be applied to an engine having a cylinder diameter of up to about 600 mm. However, it is impossible to increase the size of the upper spring bearing 101 due to insufficient bearing strength on the thrust surface thereof.

[0006] The apparatus shown in FIG.
There is a problem in that the temperature of the valve rises and drops off from the valve stem 104.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a rotation device for an intake / exhaust valve according to claim 1 of the present invention comprises:
A piston chamber (14) in which a supply hole (19) for introducing a working fluid is opened on a side wall surface and an upper part is sealed.
A piston (13) provided at the upper end of the intake / exhaust valve and movably provided in the piston chamber (14) in the axial direction to move the intake / exhaust valve; and a piston (13) provided inside the piston (13). The working fluid introduced from the supply hole (19) into the piston chamber (14) in the recess (20) formed on the outer peripheral surface of the piston (13) and the piston (13). Space (15) for receiving through a communication hole (21) formed in the outer peripheral surface
And an injection formed at the top of the piston (13) so as to be inclined with respect to the axial direction of the piston (13) so that the space (15) communicates with the piston chamber (14) above the piston (13). A hole (22), wherein the piston (13) passes through the recess (20) and the communication hole (21) from the supply hole (19) when the piston (13) is near the top dead center of the piston chamber (14). By injecting the working fluid introduced into the space (15) into the closed piston chamber (14) above the piston (13), the piston (13) and the intake / exhaust valve are rotated. It is characterized in that it is configured to be lowered.

According to a second aspect of the present invention, there is provided a rotation device for an intake / exhaust valve, wherein a supply hole (19) through which a working fluid is introduced is opened in a side wall surface, and an upper portion of the piston chamber is sealed. 34) a piston (32) provided at the upper end of the intake / exhaust valve and movably provided in the piston chamber (34) in the axial direction to move the intake / exhaust valve; and the supply hole (19). An injection groove formed by a groove formed on the outer peripheral surface of the piston (32) in a direction in which the upper end portion is inclined with respect to the axial direction of the piston and communicates with the piston chamber (34) above the piston (32). 37, 38), wherein the piston (32) is provided in the piston chamber (34).
When the working fluid is near the top dead center, the working fluid introduced from the supply hole (19) into the injection groove (37, 38) is directed into the sealed piston chamber (34) above the piston (32). It is characterized in that the piston (32) and the intake / exhaust valve are lowered while rotating by injecting.

[0009]

When the piston is near the top dead center, that is, when the intake / exhaust valve is in the closed position, the working fluid introduced into the piston chamber moves the piston in the axial direction by the pressure, and the piston chamber moves. In the above, the fuel is injected obliquely from the injection hole or the injection groove of the piston to rotate the piston. The intake and exhaust valves connected to the piston move in the axial direction and rotate by a predetermined angle.

[0010]

1 to 4 show a rotary device 1 according to a first embodiment.
Will be described by taking an intake valve as an example. As shown in FIG. 1, an intake valve 3 is slidably provided in the intake valve case 2.
An air cylinder 4 is provided at the upper end of the intake valve case 2, and an air piston 6 attached in the middle of a valve rod 5 of the intake valve 3 can slide. Air cylinder 4
Inside, a predetermined air pressure is always supplied through the supply port 7. Reference numeral 8 denotes a safety valve.

An intake valve 3 is provided at the upper end of the air cylinder 4.
A cylinder 9 to which a hydraulic oil for operating the cylinder is supplied is attached. That is, the large diameter portion 10 provided at the lower end of the cylinder 9 extrapolates the upper end of the air cylinder 4, and a space 11 is formed between the air piston 6 and the cylinder 9. A vent 12 is formed in the large diameter portion 10 of the cylinder 9, and the space 11 is open to the atmosphere.

A piston 13 is fixed to the upper end of the valve rod 5 of the intake valve 3. The piston 13 is slidably housed in a piston chamber 14 of the cylinder 9.

As shown in FIGS. 2 and 3, the piston 13 has a cylindrical shape in which a space 15 is formed and the lower end is opened. A step 16 is formed at the lower end, and a bolt hole 17 is formed at the upper end. And
The step 16 is inserted into the upper end of the valve stem 5 and the bolt hole 1 at the upper end is inserted.
7 into the screw hole 5a at the upper end of the valve stem 5.
, The piston 13 is integrally fixed to the upper end of the valve rod 5.

A supply hole 19 for supplying hydraulic oil at a predetermined pressure is formed in the inner peripheral wall of the cylinder 9. The outer peripheral surface of the piston 13 that is in sliding contact with the inner peripheral wall has
0 is formed so that hydraulic oil can be received between the cylinder 9 and the piston 13.

A communication hole 21 is formed above the concave portion 20 to communicate the space 15 inside the piston 13 with the piston chamber 14. That is, the hydraulic oil that has entered the recess 20 through the supply hole 19 enters the space 15 inside the piston 13 through the communication hole 21.

As shown in FIGS. 3 and 4, four injection holes 22 are provided at predetermined angles on the top of the piston 13 so as to be at a predetermined angle with respect to the axes of the piston 13 and the valve stem 5. To form the injection unit 23.

Next, the operation of the above configuration will be described. The hydraulic oil supplied from the supply hole 19 enters the space 15 from the recess 20 via the communication hole 21 and the piston 13
The fuel is injected from the injection hole 22 at the top and fills the piston chamber 14 of the cylinder 9.

As a result, the piston 13 moves in the axial direction together with the valve rod 5, and the intake valve 3 is opened. At this time, a circumferential rotational force is generated in the piston 13 by the reaction force of the injected hydraulic oil, and the piston 13 rotates together with the valve rod 5.

When the supply of the hydraulic oil is stopped, the valve rod 5 rises by the air pressure applied to the air piston 6 provided on the valve rod 5, and the intake valve 3 is closed.

According to this embodiment, since the valve rotates a predetermined angle each time the valve is opened and closed, the condition of the seat surface does not always become the same, and abrasion proceeds at a specific portion of the seat surface to cause blow-through. The inconvenience of doing so can be reliably avoided.

Further, in this embodiment, the intake valve 3 is exemplified, but it is needless to say that the same rotating device can be applied to the exhaust valve.

However, there may be a case where it is necessary to make a difference in the rotation of the valve depending on the number of rotations and the size of the engine, in the case of the intake valve and the exhaust valve. In such a case, it can be adjusted by changing the diameter, the inclination angle, the number of the injection holes 22 with respect to the axis, and the like.

The second embodiment will be described with reference to FIGS. Since the configuration of the piston 32 and the cylinder 33 of the rotating device 31 of the present embodiment is different from that of the first embodiment, the description will focus on the relevant portions.

A concave portion 35 is formed circumferentially on the inner surface of the piston chamber 34 of the cylinder 33, and a supply hole 19 for hydraulic oil is opened in the concave portion 35.

The piston 32 has a cylindrical shape and is fixed to the upper end of the valve stem 5 with a bottle 36. On the outer peripheral surface of the piston 32, a plurality of grooves 37 are formed at equal intervals. The lower part of each groove 37 is parallel to the axis of the piston 32 and the valve stem 5, but the upper part reaching the upper end surface of the piston 32 has
The injection groove 38 is inclined at a predetermined angle with respect to the axis in the same direction. And these plural injection grooves 3
An injection part 39 for rotating the piston 32 is constituted by 8.

In the structure of this embodiment, when hydraulic oil is supplied to the cylinder 33, the hydraulic oil
5 to each groove 37, and each injection groove 38 to the piston 32
To fill the piston chamber 34.

The piston 32 and the valve rod 5 are connected to the piston chamber 3
4 falls with the pressure of the working oil filled in and rotates by the reaction of the injection. In addition, according to this embodiment, the same operation and effect as those of the first embodiment can be obtained.

[0028]

The intake and exhaust valve rotating device according to the present invention is provided with an injection hole or an injection groove for obliquely injecting a working fluid to a piston in a piston chamber for operating the intake and exhaust valve, and the injection is performed when the valve is opened. The working fluid is ejected from the hole or injection groove to the upper part of the closed space of the piston chamber to forcibly rotate the intake / exhaust valve. The valve can be rotated, and uneven wear and blow-through of the valve can be reliably prevented. Also,
The upper part of the piston chamber is sealed, there is no need to provide a check valve or the like, the structure is simple, and the reliability of operation can be secured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a sectional view of a cylinder and a piston according to the first embodiment.

FIG. 3 is a sectional view of a piston according to the first embodiment.

FIG. 4 is a diagram viewed from an arrow P in FIG. 3;

FIG. 5 is a sectional view of a cylinder and a piston according to a second embodiment.

FIG. 6 is a sectional view of a piston according to a second embodiment.

FIG. 7 is a sectional view taken along the line PP of FIG. 6;

FIG. 8 is a cross-sectional view illustrating an example of a conventional rotating device in an intake / exhaust valve of an internal combustion engine.

FIG. 9 is a cross-sectional view showing another example of a conventional rotating device in an intake / exhaust valve of an internal combustion engine.

[Explanation of symbols]

 1,31 Rotating device 3 Intake valve 13,32 Piston 14,34 Piston chamber 15 Space 22 Injection hole 38 Injection groove 23,39 Injection unit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomoji Abe 1300, Okayama, Niigata City, Niigata Niigata Design Co., Ltd. Niigata Office (56) References JP-A-59-47581 (JP, A) 152008 (JP, U)

Claims (2)

(57) [Claims] A supply hole (19) into which a working fluid is introduced is provided.
A piston chamber (14) which is open at the side wall surface and whose upper part is sealed; and a piston chamber (14) provided at the upper end of the intake / exhaust valve and movably provided in the piston chamber (14) in the axial direction .
And a space (15) provided inside the piston (13).
Thus, the supply hole (19) is provided in the piston chamber (14).
Working fluid introduced from the piston to the outer peripheral surface of the piston (13)
In the formed concave portion (20) and the outer peripheral surface of the piston (13)
A space (15) to be received through a communication hole (21) having an opening , the space (15) and the piston (13);
The piston is connected so as to communicate with the upper piston chamber (14).
The top of the stone (13) is axially opposed to the piston (13).
And an injection hole (22) formed to be inclined.
The piston (13) is located at the top dead center of the piston chamber (14).
When it is in the vicinity, the supply hole (19) extends from the recess (2).
0) and the space (15) through the communication hole (21).
The working fluid introduced into the piston (13)
Inject into the closed piston chamber (14)
As a result, the piston (13) and the intake and exhaust valves are rotated.
Characterized in that it is configured to descend while
Rotation device that the intake and exhaust valves. 2. A supply hole (19) into which a working fluid is introduced.
Open to the side wall surface and the piston chamber top is sealed (34), movably set in the axial direction in the piston chamber (34) with is provided at the upper end of the intake and exhaust valves
A piston (32) for moving the intake exhaust valves eclipsed,
Piston above supply hole (19) and piston (32)
The upper end portion communicates with the chamber (34).
Out of the piston (32) in a direction inclined to the direction
Injection grooves (37, 38) formed of grooves formed on the peripheral surface
And the piston (32) is provided with the piston chamber (3).
4) When it is near the top dead center, it is forward from the supply hole (19).
The working fluid introduced into the injection grooves (37, 38) is
The closed piston chamber (3) above the stone (32)
4) By injecting inward, the piston (3
2) Lower the valve while rotating the intake and exhaust valves.
A rotating device for an intake / exhaust valve, wherein the rotating device comprises: