JPS6233089Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an idle speed control valve for an internal combustion engine.

The idle speed control valve is provided in a bypass passage that communicates the upstream and downstream sides of the engine intake passage throttle valve.
The engine speed during idling is adjusted by controlling the flow rate of bypass air in the bypass passage, and a conventional example of this is shown in FIG.

That is, the bearings 2 and 3 at both ends of the valve body case 1
The plunger 6 in the solenoid case 5 is brought into contact with one end of the rod-shaped valve body 4 supported by the springs 8 and 9, and the amount of current applied to the solenoid coil 7 is changed.
to move against the elastic biasing force of. As a result, the opening area between the valve body 4 and the valve seat 10 is changed according to the amount of energization of the solenoid coil 7, and the intake inlet 11
Bypass air introduced from the air outlet 12 is guided to the air outlet 12 with its flow rate controlled.

Note that 13 is a blind cap for the opening of the valve body case 1, and 14 is a flange for fixing the solenoid case 5 to the valve body case 1.

However, in such a conventional idle speed control valve, since the valve body 4 is configured to slide within the bearings 2 and 3 that support the valve body 4, the sliding friction resistance of the valve body 4 is large, and the solenoid coil This was a factor in the occurrence of hysteresis in the bypass air flow rate characteristics with respect to the amount of current applied to the pump. For this reason, the control accuracy of the bypass air flow rate has deteriorated. Also, bearing 2,
There was a problem in that the sliding resistance further increased due to wear of the parts 2 or dust entering the bearing part.

The present invention was developed in view of these conventional problems, and by supporting the rod-shaped valve body with a leaf spring that can deform only in the direction of the valve axis, the valve body can be moved without using the conventional bearing part. It is an object of the present invention to provide an idle rotation speed control valve which reduces sliding frictional resistance generated during operation and prevents hysteresis from occurring in bypass air flow characteristics.

Hereinafter, the present invention will be explained based on an embodiment shown in FIGS. 2 and 3. Incidentally, the same elements as those in the conventional example are given the same reference numerals as in FIG. 1, and the explanation thereof will be omitted.

In the figure, a rod-shaped valve body 20 is supported at both ends by leaf springs 21 and 22, which will be described later, respectively, so as to be concentric with the valve seat 10. That is, at one end on the solenoid coil 7 side, the solenoid case 5 mounting flange 14 and the valve body case 1
One end of the valve body 20 and the plunger 6 are screwed together through a hole 21a in the center of a leaf spring 21 held between the valve body 20 and the plunger 6. At the other end, the valve body 2 is inserted through a hole 22a in the center of a leaf spring 22 held between the valve body case 1 and another valve body case 1A that is separate from the case 1.
0 and a retainer 23 of the spring 22 are screwed together.

As shown in FIG. 3, the leaf springs 21 and 22 have grooves 21b of an appropriate shape around the center portions so that the center portions where the holes 21a and 22a are formed are easily deformed in the vertical direction in the figure. It is stamped and formed.

Furthermore, the plunger 6 connected to the valve body 20 is also supported at the center of the solenoid case 5 by the leaf spring 21 with a gap therebetween.

According to the idle speed control valve having such a configuration,
Since the valve body 20 is supported only by the leaf springs 21 and 22 and has no sliding parts, even if the valve body 20 is moved in the valve axis direction together with the plunger 6 by changing the amount of current applied to the solenoid coil 7,
Unlike the conventional case, sliding frictional resistance is not generated when the valve body 20 moves. For this reason, solenoid coil 7
The amount of movement of the valve body 20 with respect to the amount of current applied to is constant,
This eliminates hysteresis between the amount of current applied and the fluid flow rate, thereby improving flow control accuracy.

As explained above, in the present invention, the valve body is supported by a leaf spring that can be deformed only in the direction of the valve shaft, so there is almost no frictional resistance when moving the valve body, and the valve body corresponds to the amount of current applied to the solenoid coil. The position is constant and hysteresis between the amount of current and fluid flow rate can be eliminated. Therefore, the flow rate control accuracy of the control valve is improved, and the idle rotation speed control accuracy is also improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional idle speed control valve, FIG. 2 is a sectional view showing an embodiment of the present invention,
FIG. 3 is a front view showing the leaf spring used in FIG. 2. 6...Plunger, 7...Solenoid coil, 10
...valve seat, 20...valve body, 21, 22...leaf spring.

Claims (1)

[Scope of utility model registration request] A rod-shaped valve element is supported within the valve body so as to be movable in the axial direction of the valve element, and the valve element is displaced according to the amount of current applied to the solenoid to communicate the upstream and downstream sides of the intake throttle valve in the engine intake passage. In an idle rotation speed control valve for an internal combustion engine that changes the passage area of a bypass passage and controls the air flow rate of the bypass passage, the valve body is supported within a valve body by a leaf spring that can be deformed only in the axial direction of the valve body. An idle speed control valve for an internal combustion engine, characterized in that: