JPS608137Y2 - Valve mechanism of pressure regulator in LPG internal combustion engine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a valve mechanism of a pressure regulating device in an LPG fuel engine.

Conventionally, this type of valve mechanism has a structure in which a valve is integrally attached to a lever related to a diaphragm using a wave washer and a daruma pin, or a lever and a valve are connected by a link mechanism, and the valve is attached to a guide. There are structures that perform a sealing action by moving linearly along the line.

In this integrated structure using the Daruma pin, the valve integrally rotates in an arc shape with the lever and comes into contact with the seat surface, so when this valve surface hits the seat surface, the sealing surface between the valve and the seat The surface pressure on the lever is uneven, that is, the surface pressure on the rotating base side of the lever is low, which may cause fuel leakage.

In order to eliminate this problem, adhesive is used to fix and integrate the valve, but this requires adjustment of the valve contact, amount of adhesive applied, curing temperature, application position or roughness of the application surface, cleanliness, etc. The disadvantage is that it is difficult to manage and requires a lot of man-hours.

Additionally, those equipped with a link mechanism have the disadvantage that they are difficult to adjust and are expensive.

Therefore, the purpose of this invention is to propose a valve mechanism that can eliminate the above-mentioned drawbacks, namely, a lever 2 that rotates around a support shaft 5 by the operation of a diaphragm 3, and a lever 2 that rotates around a support shaft 5 by the operation of a diaphragm 3. The lever 2 and the valve holding plate 6 are movably mounted and have an elastic valve holding plate 6 fixed to the tip of the valve 4 corresponding to the seat 1a surface. At the same time, the lever 2 has a semicircular pressing part 2a at its tip that acts on the center of the valve 4, and the valve holding plate 6 is arranged around the support shaft 5 in the front and rear directions. It has contact points A and B with respect to the lever 2, and a bent portion 6b is provided in the middle of the contact points A and B.

Next, an embodiment of this invention shown in the drawings will be described.

Reference numeral 1 indicates a body of the fuel pressure regulating device, and reference numeral 2 indicates a lever for transmitting the operation of a diaphragm 3 to a valve 4, which is rotatably provided in the vertical direction with respect to the body 1 by a support shaft 5.

6 is a valve holding plate composed of a leaf spring, and its arm portion 6a
It is rotatably mounted on the support shaft 5, and its main body is located on the lower surface of the lever 2, so that its front and rear parts are in contact with the lever 2, and furthermore, the valve 4 is fixed to the lower front surface.

The contact point A between the lever 2 and the front part of the valve holding plate 6 is formed by forming a semicircular pressing part 2a protruding from the front lower surface of the lever 2, and the contact point A between the pressing part 2a and the valve holding plate 6 is Point contact is made, and this contact point A is connected to the fuel passage 7.
is set to be located on the center line of

B indicates the rear contact point.

8 indicates an E-ring. Next, the effect will be explained.

When fuel is cut off, the lever 2 rotates counterclockwise about the support shaft 5 due to the acting force of the diaphragm 3, and thereby the valve holding plate 6 also rotates together with the lever 2.

When the valve 4 comes into contact with the surface of the seat 1a, the pressing portion 2a of the lever 2 presses the valve 4 onto the surface of the seat 1a via the valve holding plate 6.

At this time, the valve holding plate 6 is a leaf spring that can be bent in the vertical direction, and the contact point A where the pressing part 2a engages is set at the center of the valve, that is, the center of the seat 1a. , the entire circumference of the valve 4 is evenly pressed onto the surface of the seat 1a.

That is, if the surface of the seat 1a is maladjusted and is inclined, for example, as shown in FIG. The holding plate 6 is tilted downward and inclined along the seat 1a surface, and the intermediate bent portion 6b of the holding plate 6 is at the top with respect to the influence of this inclination on the valve holding plate 6.

Since it bends downward and escapes, the valve 4 is evenly pressed against the surface of the seat 1a.

Additionally, if the valve wears down on one side due to long-term use, a pressing force will act on the one side that has worn out as described above, and the entire circumference of the valve will be evenly pressed against the seat surface, resulting in a loss of sealing. do not have.

Furthermore, since the lever 2 and the valve holding plate 6 can move independently, the contact point A is slides and its operation is not obstructed.

Further, the valve holding plate 6 is connected to the lever 2 at both contacts A,
By being engaged at B, the contact point A of the lever 2,
The valve is opened and closed by engagement with B, and the movement of the diaphragm 3 is reliably transmitted to the valve 4, with no delay in operation.

As described above, in this invention, even if the seal 1a surface is tilted due to poor adjustment, the valve 4 can be moved to the seal 1a.
Since sealing can be achieved with uniform surface pressure on the a side, when assembling the valve, adjustments such as the contact between the sealing surfaces of the valve and the seat do not require the precision required with conventional ones, and therefore the assembly is easier. This makes attaching work easier.

Moreover, even if the valve wears down due to long-term use, there is no problem with the sealing action, so there is no need to make adjustments over a long period of time.

Furthermore, since the structure is simple, there are few failures, and it is inexpensive, making it extremely effective in practice.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a side view, FIG. 2 is a sectional side view, and FIG. 3 is an explanatory diagram of the operation of the valve. 1...Body, 2...Lever, 2a.
...Press portion, 3...Diaphragm, 4.
...Valve, 5...Spindle, 6...
・Valve holding plate, 7...Fuel passage, A, B・
...Contact point.

Claims (1)

[Scope of utility model registration request] A lever 2 that rotates around a support shaft 5 by the operation of a diaphragm 3, and an elastic valve holding plate 6 that is rotatably attached to the support shaft 5 and has a valve 4 fixed to its tip that corresponds to the surface of the seat 1a. Tokara precepts, these levers 2
and a valve holding plate 6 are arranged so that the former is located at the upper part and the latter is located at the lower part, and the lever 2 has a semicircular pressing part 2a at its tip that acts on the center of the valve 4,
The holding plate 6 of the valve has contact points A and B with respect to the lever 2 on the front and back sides of the support shaft 5, and the contact points A,
A valve mechanism of a pressure regulating device in an LPG fuel engine in which a bent portion 6b is provided in the middle portion of B.