JPS6242104Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a tamper prevention device for an idle rotation control device, particularly in an idle rotation control device.
This invention relates to a tamper prevention device for an idle rotation control device for sealing a switch mechanism once adjusted to an optimum interval by an adjustment screw so that it cannot be touched unnecessarily.

Generally, the carburetor of an internal combustion engine tends to be electronically controlled, and it is well known that parameters such as cooling water temperature, intake pipe negative pressure, and engine speed are taken into consideration. This will be explained with reference to FIGS. 1 and 2, which are conventional devices. FIG. 1 is a block diagram of the control system. In Figure 1, 1 is an intake pipe, 2
is the throttle valve, 3 is the throttle lever, 4
The throttle valve 2 is normally biased by the spring 4 in the closing direction about the shaft 5. On the other hand, a plunger (not shown) is slidably provided in the idle rotation control device 6, and a rod 7 is integrally formed with the plunger.
protrudes outward, and its tip 7' is in contact with the throttle lever 3. In addition, the electronic control device 8 includes:
For example, parameters such as cooling water temperature, intake pipe negative pressure, and engine speed are input, and a control signal is given to the motor 9 according to the calculation result of each of the parameters, which controls a plunger (not shown) in the idle rotation control device 6. Move by sliding. The rod 7 integrated with the plunger is moved in and out, and the resulting idle speed is set to an optimum value. In this type of device, it is necessary for control to know the moving position of the plunger, and this is accomplished by electrical contacts as shown in FIG.

That is, FIG. 2 shows only the end portion of the idle rotation control device, and in the figure, 10 is a plunger, and a rod (not shown) is integrally formed with the plunger 10 at a position above this plunger. The plunger 10 is provided so as to be freely slidable in the directions of solid line arrows A and B shown in the figure, and is moved by control signals from the electronic control device 8 described above. Therefore, by moving the plunger 10 in the B direction, the end portion of the plunger 10 moves toward the operating rod 1.
1, the operating rod 11 is lowered together with the plunger, separating the movable contact 12 shaped like a leaf spring from the fixed contact 13 also shaped like a leaf spring. The moving position of the plunger is detected using the electrical signal generated when this contact opens. At this time, the adjustment screw 14 is used to adjust the opening position, etc.
is provided at the free end of the fixed contact 13, and the recess 15
The optimum position is determined by insertion and removal through the holder, but since this end protrudes to the outside, it can be touched after adjustment, making it impossible to maintain the optimum value even after careful adjustment. have.

The present invention has been made to solve the above-mentioned drawbacks, and aims to provide a tamper prevention device for an idle rotation control device that cannot be touched in vain once it is adjusted to the optimum value.

In the present invention, a cut groove is formed on the periphery of the protrusion of the adjustment screw, and after adjustment, the protrusion is broken off from the cut groove and removed, and the upper part is hardened with a filler or adhesive.

Examples will be described below with reference to the drawings. Third
The figure is a diagram showing the main part of an embodiment of a tamper prevention device for an idle rotation control device according to the present invention. Reference numerals 10 to 15 in the figure correspond to those in FIG. 1
Reference numeral 6 denotes a cut groove of the adjustment screw, which is provided on the periphery of the protrusion. 17 is a filler or adhesive. Therefore, the adjusting screw 14 is inserted and removed through the recess 15, and after the optimum position is determined, the protruding end is broken off by the cut groove 16 and removed, and the screw is inserted over it as shown by the dotted line part 17. A dustproof rubber cover 18 is covered with a filler or an adhesive. Of course, it is better if the outer periphery of the protruding portion of the adjustment screw is held down by a rubber cover and covered with a filler.

As explained above, according to the present invention, a kerf is provided on the periphery of the protruding part of the adjusting screw, and after the adjustment is made to the optimum value, the kerf is broken off and removed, and the upper part of the kerf is covered. It is possible to provide a tamper prevention device for an idle rotation control device that can maintain an optimal adjustment state.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the operation of the idle rotation control device;
FIG. 2 is a diagram illustrating the contact relationship and adjustment screw for detecting the plunger position, and FIG. 3 is a diagram illustrating a tamper prevention device for an idle rotation control device according to the present invention. 1...Intake pipe, 2...Throttle valve, 3...
...Throttle lever, 4...Spring, 5...Shaft, 6
...Idle rotation control device, 7... Rod, 7'
... Rod end, 8 ... Electronic control device, 9 ... Motor, 10 ... Plunger, 11 ... Operating rod,
12...Movable contact, 13...Fixed contact, 14...
Adjustment screw, 15... recess, 16... kerf, 17... filler, 18... dustproof rubber cover.

Claims (1)

[Scope of utility model claims] A leaf spring-like electrical contact supported by an adjustment screw is provided at the end of the idle rotation control device, and the leaf spring-like electrical contact opens and closes in response to movement of a plunger provided so as to come into contact with the end of the throttle lever. In an idle rotation control device that controls the rotation distance of the throttle lever,
An adjustment screw end protruding outward by piercing a lid provided to close the end face of the device, a cut groove provided in the adjustment screw end, and a cut groove portion bent at the cut groove portion and removed. A tamper prevention device for an idle rotation control device, comprising a filler or adhesive that covers and fixes the end of an adjusting screw.