JP3347081B2 - Plate valve testing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing a plate-like valve used for an intake / exhaust port of an internal combustion engine or the like.

[0002]

2. Description of the Related Art A plate-shaped valve called a reed valve is used for an intake / exhaust port of an internal combustion engine. 6A and 6B show an example of a plate-like valve, where FIG. 6A is an external view and FIG. As shown in (B), a window 1b is provided in a frame 1a having a mountain-shaped cross section, and a valve plate 1c made of a leaf spring or the like is fixedly provided on one side so as to cover the window 1b. When the inner pressure Pi becomes greater than the outer pressure Po, the valve plate 1
c opens and gas flows from the inside to the outside as shown by the arrow,
When the inner pressure Pi becomes smaller than the outer pressure Po, the valve plate 1c closes and no gas flows. That is, it functions as a check valve.

In the case of a high-speed rotation engine, 12000 rpm
Since the plate-shaped valve is operated at a rotational speed of about m, the plate valve opens and closes accordingly. A test apparatus shown in FIG. 7 has been used as a test apparatus for such a high-speed plate valve. An inlet 21 and an outlet 22 are provided in the cylinder 20, and each of the ports 21 and
Attach the plate-shaped valve 1 in the direction shown in FIG. Piston 23
Is reciprocated at high speed by the crank device 24.

[0004]

However, in such a test apparatus, the high pressure generated when the engine explodes and burns cannot be applied to the plate-shaped valve, and the state of being mounted on the engine cannot be reproduced. was there.

The present invention has been made in view of the above-mentioned problems, and has as its object to provide a plate-shaped valve test apparatus which reproduces a state of being attached to an engine as much as possible.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a body having a cylindrical through hole, a plate-shaped valve installation space communicating with the through hole, and a fitting in the through hole. A fixed cylinder having a first conduction hole and a second conduction hole for conducting the interior of the cylinder and the plate-shaped valve installation space, and a cylinder rotatably fitted to the fixed cylinder; A rotating cylinder having an inlet passage communicating with the first conduction hole and an exit passage communicating with the second conduction hole to the other end.

[0007] A plate-like valve is mounted in the plate-like valve installation space,
This plate-like valve has a pressure somewhat higher than the atmospheric pressure, for example, 0.0
It is assumed that low-pressure air of 5 MPa is supplied, and high-pressure air of an explosion combustion pressure of the engine, for example, 0.25 to 0.7 MPa is supplied to the inlet passage. The rotating cylinder rotates at high speed according to the rotation speed of the engine. The operation in such a state will be described. During a period in which the first conduction hole and the inlet flow path are in communication, the plate-shaped valve installation space is filled with high-pressure air, and the plate-shaped valve is closed. Next, when the conduction between the first conduction hole and the inlet flow path is lost or slight, and the conduction between the second conduction hole and the outlet flow path becomes conductive, the pressure in the plate-shaped valve installation space rapidly decreases, and finally, the plate-shaped valve is closed. Lower than supplied low pressure air pressure. Then, the plate-shaped valve is opened, and the low-pressure air passes through the plate-shaped valve and is discharged to the outside from the outlet channel. When conduction between the second conduction hole and the outlet flow path is lost, the pressure in the plate-like valve installation space becomes low-pressure air pressure, and the plate-like valve is closed. As a result, a high pressure corresponding to the explosion combustion pressure of the engine is applied to the plate-shaped valve, and it is possible to simulate a state in which the valve is mounted on the engine.

[0008] In the second aspect of the present invention, the rotary cylinder is arranged such that when the inlet flow path is connected to the first conductive hole, the outlet flow path is not connected to the second conductive hole.

With this arrangement, it is possible to reproduce an engine state in which scavenging is performed after explosive combustion is completed.

According to the third aspect of the present invention, the fixed cylinder is divided into two parts in the axial direction between the first conduction hole and the second conduction hole.
The other is rotated with respect to the other, so that the mutual rotational position can be adjusted.

[0011] With this configuration, the relative relationship between the timing of the conduction between the first conduction hole and the inlet flow path and the timing of the conduction of the second conduction hole and the exit flow path can be adjusted. Can be.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a configuration of a plate-shaped valve test apparatus according to the present embodiment, FIG. 2 is a cross-sectional view of FIG. 1, (A) is an XX cross-sectional view, and (B) is a YY cross-sectional view. FIG. 1 is a plate-shaped valve to be tested. Reference numeral 2 denotes a main body constituting the present test apparatus, which is provided with a cylindrical through hole 6 in a rectangular parallelepiped.
Further, a plate-shaped valve installation space 7 that communicates with the through hole 6 is provided at an upper portion of the rectangular parallelepiped, and an air inlet 9 that guides low-pressure air (for example, 0.05 MPa) is provided in the space 7. 3
Is a first fixed cylinder fitted into the through hole 6 to a depth approximately half of that of the through hole 6. A high-pressure air inlet 10 is provided at an end of the first fixed cylinder. Hole 11
Is provided. Reference numeral 4 denotes a second fixed cylinder, which is fitted to the remaining half of the depth of the through hole 6, and a second conduction hole 12 is provided at a position in contact with the plate-shaped valve installation space 7 of the cylindrical portion.
In addition, the first or second fixed cylinders 3 and 4 can rotate. Rotation is performed manually.

A rotating cylinder 5 is fitted on the inner surfaces of the first and second fixed cylinders 3 and 4 so as to be rotatable at a high speed. On the first fixed cylinder side of the rotary cylinder 5, there is provided an inlet passage 13 that communicates with the high-pressure air inlet 10 and the first communication hole 11.
As shown in FIGS. 1 and 2A, this flow path is composed of an axial flow path and a cross-shaped flow path connected thereto. Further, an outlet channel 14 which is in communication with the second conduction hole 12 and is open to the outside is provided in a portion of the rotary cylinder 5 fitted to the second fixed cylinder 4. This portion is a hollow cylinder, the end surface of the first fixed cylinder side is closed and the other is opened, and four conductive holes 5a are provided at 90 ° intervals on a circumferential surface in contact with the second conductive hole 12. A timing belt ring 15 is attached to the outer periphery of a portion of the rotary cylinder 5 which is outside the second fixed cylinder 4 and is rotated at a high speed by a timing belt (not shown).

The rotating cylinder 5 is supported by bearings 16 provided on the first fixed cylinder 3 and the second fixed cylinder 4 so as to be rotatable at high speed. An O-ring 17 is provided on the sliding surface between the first fixed cylinder 3 and the second fixed cylinder 4 to prevent air leakage. The O-ring 17 is also provided between the flange 3a of the first fixed cylinder 3 and the main body 2 and between the flange 4a of the second fixed cylinder 4 and the main body 2.

Next, the operation will be described with reference to FIGS.
FIG. 3 schematically shows a state in which the plate valve 1 is installed in the plate valve installation space 7. 9 is 0.05M intake port
Low pressure air of Pa is supplied. Reference numeral 7 denotes a plate-shaped valve installation space in which the first conduction hole 11 is electrically connected to the inlet flow path 13 (in this case, the first conduction hole is opened, and when not conducted, the first conduction hole is closed). High pressure air flows in. Further, when the second conduction hole 12 is in communication with the outlet flow path 14 (in this case, the second conduction hole is opened, and when the conduction is not conducted, the second conduction hole is closed), the air in the plate-shaped valve installation space 7 is discharged. You. Ps represents the pressure of the intake port 9, Pc represents the pressure of the plate-shaped valve installation space 7, and F represents the air flow passing through the plate-shaped valve 1.

FIG. 4 shows a state in which the state variables shown in FIG. 3 are changed by the rotation of the rotary cylinder. In this case, the first conduction hole 1
The first fixed cylinder 3 and the second fixed cylinder 4 are connected such that the second conductive hole 12 is closed when 1 is open, and the second conductive hole 12 is opened when the first conductive hole 11 is closed. It is assumed that the relative position of has been adjusted. When the first conduction hole 11 is opened, Pc rises sharply, and when Pc reaches 0.25 MPa, this is maintained, and the first conduction hole 11 is closed, and at the same time, the second conduction hole 12 is closed.
When it opens, it decreases rapidly. This value is 0.05M
When the pressure becomes equal to or less than Pa, the plate-shaped valve 1 opens and the intake air becomes the air flow F and is discharged from the second conduction hole 12. Note that Ps is 0.05 MPa while the plate valve 1 is closed, and decreases when the plate valve 1 is opened.
The air flow F stops when the second conduction hole 12 is closed. Next, one cycle ends when the first conduction hole 11 is opened. In the case of the present apparatus, one cycle is performed every time the rotary cylinder 5 is rotated by 90 °, so that the plate valve 1 is opened and closed four times in one rotation. Thus, when simulating an engine of 12000 rpm, the rotating cylinder 5 may be rotated at 3000 rpm.

FIG. 5 is different from the case of FIG.
Shows a case in which the opening time is slightly delayed. By doing so, as shown in A, the first conduction hole 11 and the second conduction hole 1
2 is closed, and as shown in B, the first conduction hole 11 and the second conduction hole 12 are opened. As for Pc and Ps, the period during which the pressure is high slightly increases, but the period during which the air flow F flows (the period during which the plate-shaped valve is opened) becomes short.

[0018]

As is clear from the above description, the present invention provides a cylindrical through hole and a plate-like valve installation space in a main body, a fixed cylinder is fitted into the cylindrical through hole, and the inside of the fixed cylinder is further improved. A rotatable cylinder is rotatably fitted to the fixed cylinder, high-pressure air is introduced from one end of the fixed cylinder, low-pressure air is introduced through a plate-shaped valve, and exhausted from the rotating cylinder. Can be simulated. Furthermore, since the fixed cylinder is divided into two parts in the axial direction so that the relative positions of the conduction holes provided in each part can be adjusted, it is possible to more simulate the state of the engine.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a plate-shaped valve test device of the present embodiment.

2A is a cross-sectional view of FIG. 1, and FIG.
(B) is a YY sectional view.

FIG. 3 is a view schematically showing a state in which a plate-shaped valve is installed in a plate-shaped valve installation space.

FIG. 4 is a diagram showing the operation of the present embodiment.

FIG. 5 is a diagram illustrating an operation in another state of the present embodiment.

6A and 6B show a configuration of a plate-like valve, where FIG. 6A is an external view and FIG. 6B is a diagram showing functions.

FIG. 7 is a diagram showing a configuration of a conventional plate valve testing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plate-shaped valve 2 main body 3 first fixed cylinder 3a flange 4 second fixed cylinder 4a flange 5 rotating cylinder 5a conduction hole 6 through hole 7 plate-shaped valve installation space 9 intake port 10 high-pressure air intake 11 first conduction hole 12th 2 conduction hole 13 inlet channel 14 outlet channel 15 timing belt ring 16 bearing 17 O-ring

Claims (3)

(57) [Claims] 1. A main body having a cylindrical through hole, a plate-shaped valve installation space communicating with the through hole, and a hollow cylinder fitted into the through hole, the inside of the cylinder and the plate-shaped valve installation space being connected to each other. A fixed cylinder having a first conduction hole and a second conduction hole for conducting, a cylinder rotatably fitted to the fixed cylinder, an inlet flow path communicating from one end to the first conduction hole, and the second conduction hole And a rotary cylinder having an outlet flow path communicating with the other end and reaching the other end. 2. The rotary cylinder according to claim 1, wherein the outlet channel is not connected to the second conductive hole when the inlet channel is connected to the first conductive hole. Item 3. The plate-shaped valve test device according to Item 1. 3. The fixed cylinder is axially divided into two parts between the first conduction hole and the second conduction hole, and the rotational position of one can be adjusted by rotating the other relative to one. The plate-like valve testing device according to claim 1, wherein: