JPS5926834B2 - Negative pressure transmission circuit switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a negative pressure transmission circuit switching device used in automobiles and the like.

This negative pressure transmission circuit switching device transmits the negative pressure (engine suction pressure) of the automobile's intake manifold to the diaphragm, and is used for negative pressure advance control of the distributor, and also when gasoline from the fuel tank evaporates into the atmosphere. It is used as a device that sucks these gasoline vapors into the intake manifold using the negative pressure of the intake manifold to prevent them from being released, and is especially used as a control device for the regulation of pollution gas emission countermeasures. It has received a lot of attention and has been widely used in recent years.

As mentioned above, when the negative pressure of the intake manifold is used as a drive source, the transmission circuit is generally switched to the atmospheric pressure circuit or opened and closed as necessary, and the transmission circuit is used by electrical signals using a solenoid valve. Often switched or opened/closed.

This solenoid valve is used for pollution gas emission countermeasures.
~4 pieces are often used in combination, and conventionally in such cases, the necessary negative pressure transmission circuit and passage are formed between two plate-like bodies equipped with connection ports, and the negative pressure transmission circuit is connected. Control is performed using two to four electromagnetic valves that are directly fixed to this plate-like body to switch or open and close.

An example is shown in FIG.

1.2 is a plate-like body equipped with a connection port 3; these plate-like bodies 1 and 2 are arranged opposite to each other with a gasket 4 interposed therebetween, and a passage 5 is formed on the opposing surface; Two solenoid valves 6 and 7 are fixedly installed in the negative pressure transmission circuit 8 and
9 is configured to open and close.

As mentioned above, the conventional type requires two solenoid valves 6°7 and two plate-shaped bodies 1 and 2, so it is structurally complex and difficult to assemble due to the amount of constituent materials used. In terms of workability, the cost was high, and moreover, a large installation space was required.

The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide a negative pressure transmission circuit switching device that is small, simple in structure, and inexpensive.

Hereinafter, the present invention will be described with reference to embodiments shown in FIGS. 2 to 11.

Reference numeral 31 denotes a cylindrical case having a bottom surface 32 made of a magnetic material, and a fixed iron core 34 having through holes 33, 33' at a certain interval at symmetrical positions near the center of the bottom surface 32.
, 34' are fixed.

35 is a through hole 3 into which fixed cores 34, 34' are fitted in the center.
The coil bobbin 35 is wound to form a lunoid coil 37, which is housed in the case 31 with the through holes 36 and 36' fitted into the fixed cores 34 and 34'.

38 is a yoke with holes 39 and 39' at positions corresponding to the through holes 36 and 36' of the coil bobbin 350;
8 is placed on the coil bobbin 35 and fixed to the coil bobbin 35 in the form of a sandwich at the opening circumference 40 of the case 31.

In the above condition, coil bobbin 350 through hole 36.3
When a plunger 43.43' into which a spring 4L41' and a valve 42.42' are inserted is inserted into 6', it becomes a plunger type solenoid, and when the solenoid coil 37 is energized, the plunger 43.43' performs a suction operation.

On both sides of this plunger type solenoid, that is, on the side of the yoke 38 and on the bottom side of the case 31, a plate-like body with connection ports A to D and a passage formed within the plate thickness and a plate-like body without connection ports are fixed. The negative pressure transmission circuit switching device of the present invention is completed by connecting the two plate-shaped bodies with each other through a pipe.

To explain the above configuration in detail, 44 is a connection port 1-A.

B, C, D, and in a position corresponding to the valves 42, 42' of the plunger 43, 43',
A hole 46.46' that communicates with the hole 45, 45' having a diameter smaller than that of the coil bobbin 350 through-hole 36.36'.
and pipes 48, 48' that communicate with the rear plate-like body 47.
is an integrally formed front plate-like body, which is tightened and fixed to the yoke 38 with screws 49.

Connection port) D and C are holes 45, 45' and pipe 48.4
8' is the hollow part 5 provided within the thickness of the front plate-like body 44.
The three parties are in communication by 0.50'.

The rear plate-like body 47 is connected to the pipes 48, 48 of the front plate-like body 44.
It has a hole 5L51' that connects to the hole 5L51' and a hole 52°52' that connects to the through hole 33.33' of the fixed core 34.34'. It communicates with the provided hollow part 53, 53', and the screw 5
4 is tightened and fixed to the case 31.

Note that air leakage prevention is provided at each joint, connection, etc. to maintain airtightness.

In other words, the hollow portions 50, 50 of the front and rear plate-like bodies 44, 47
', 53, 53' are kept airtight through openings 55, 55'
, 56, 56', and a sealant is applied to the O-rings 58, 56'.
59°60 prevents air leakage.

Next, to explain the operation (circuit switching and opening/closing), when no current flows through the solenoid coil 37, the connection port B is connected to the coil bobbin 350 through hole 36, the fixed iron core 340 through hole 33, and the rear plate body 47. hole 52,
51' and then through the pipe 48' to the connecting port 1-
It communicates with C.

Connection port A is on the opposite side to the above, that is, coil bobbin 3
5 and fixed iron core 34', through holes 52' and 51 in the rear plate-like body 47, and through a pipe 48 to communicate with the connection port D.

The hole 45 that communicates with the connection port (port) D is the spring 41
Since the valve 42 is pressed by the urging force of the valve 42, it is in a closed state, and the other connection port

There is no communication with B and C.

Further, the hole 45' communicating with the connection port C is also in a closed state due to the valve 42' being pressed by the biasing force of the spring 41'.

There is no communication with B and D.

When the solenoid coil 37 is energized, the plunger 43,
43' moves by suction against the urging force of the springs 41, 41', and the fixed cores 34, 34' are moved by the valves 42, 42' inserted into the plungers 43, 43'.
The through holes 33, 33' are closed, while the holes 45.
45' is in communication with the connection ports 1-B and A.

In other words, connection port B is connected to connection port D through hole 45, and connection port 1-A is connected to connection port 1-A through hole 45'.
It will be in communication with C.

To summarize the above, when the solenoid coil 37 is not energized, the connection ports A and C are in communication, and when the solenoid coil 37 is energized, the circuit is switched and the connection ports A and C are in communication. And B and D are in communication state.

As mentioned above, this invention has a new structure in which two independent electromagnetic valves are installed inside one solenoid coil, and it is more compact than the conventional one, so it has a small structure. Easy-L component materials are used extremely efficiently to save resources, and since there are no hose piping or connections, there is no need to worry about the hose coming off or coming off, so a protective case is not required.

In addition, it has excellent effects in all aspects, such as requiring only a small installation area on a vehicle, and is economical, making it a valuable product for industrial use.

[Brief Description of the Drawings] Fig. 1 is a sectional view of a conventional negative pressure transmission circuit switching device, Fig. 2 is a cross sectional view showing an embodiment of the negative pressure transmission circuit switching device of the present invention, and Fig. 3 is a sectional view of a conventional negative pressure transmission circuit switching device. 4 is a cross-sectional front view of the same essential parts, FIG. 5 is a left side view of the same, FIG. 6 is a right side view of the same, FIG. 7,
FIG. 8 is a sectional view of a plate-like body of the same device, FIG. 9 is an external perspective view of the same device, FIG. 10 is an exploded perspective view of the same, and FIG. 11 is a negative pressure transmission circuit diagram of the same device. 37... Solenoid coil, 42...
Valve, 43... Plunger, 44, 47...
...Plate body, A to D...Connection port.

Claims (1)

[Claims] 1 Equipped with a solenoid valve that opens, closes, or switches a negative pressure transmission circuit consisting of a plurality of plungers with valves fixed in a solenoid coil, and a passage forming the necessary negative pressure transmission circuit on both sides of this solenoid valve. 1. A negative pressure transmission circuit switching device characterized in that a negative pressure transmission circuit is formed by fixing a plate-like body including a connecting port and disposing a communicating member between the two plate-like bodies.