JPS6311334Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vacuum type ignition timing control device installed in an ignition power distribution device for an internal combustion engine.

[Prior art]

Conventionally, as described in the Nippon Denso Technical Report, serial number 23-047, a notch was provided in the ignition timing control rod, and this notch was inserted into the elongated hole of the plate stopper to control the ignition timing of the rod. Movement beyond the range is regulated.

However, in the conventional type described above, the long side of the long hole is formed longer than the long side of the rod so that the notch of the rod can be inserted into the long hole of the plate stopper. Since the long side of the hole is aligned with the thickness direction of the rod, there is a drawback that the rod moves a lot along the long side of the long hole, making it difficult to assemble it into the ignition distributor. Ta.

[Purpose of invention]

In order to eliminate the above-mentioned drawbacks, the present invention has a plate stopper with a
The objective is to prevent the rod from moving in the direction of the elongated hole of the plate stopper by forming grooves or protrusions as the uneven portion with which the rod engages, thereby facilitating assembly into the ignition distributor. do.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. In FIGS. 1 to 6, the diaphragm 5
The inner peripheral edge of the ignition timing control rod 3 is fixed to the rod 3 by being narrowed between a flange 3c provided on the ignition timing control rod 3 and a seat upper 6. Further, the outer peripheral edge of the diaphragm 5 is fixed and held by tightening a cover 10 and a body 11 that form a case. A negative pressure chamber 9 is formed by a diaphragm 5 and a cover 10, and a spring 7 is installed between the seat upper 6 and a spring receiver 8 attached to the cover 10. The plate stopper 2 is fixed to the end face of the support 4. The support 4 is fixed to the body 11 by brazing. The plate stopper 2 is provided with a rectangular long hole 2b through which the rod 3 passes, and the portion of the rod 3 inserted into the long hole 2b is designed to have a rod width slightly shorter than the length of the short side of the long hole 2b. A notch 3b is provided. When assembling rod 3, place rod 3 on plate stopper 2.
Pass the rod 3 through the long hole 2b, and insert the rod 3 into the long hole 2b.
By passing the rod 3 through the notch 3b and then turning the rod 3 by 90 degrees, the movement of the rod 3 beyond the ignition timing control range is restricted by the short side of the elongated hole 2b and the notch 3b. That is, when there is no negative pressure in the negative pressure chamber 9, the end 3b1 of the notch 3b of the rod 3 on the diaphragm 5 side is in contact with the plate stopper 2, and the negative pressure chamber 9 When negative pressure is applied to the rod 3, the angle is advanced until the end 3b2 of the notch 3b of the rod 3 on the side opposite to the diaphragm contacts the plate stopper 2.

The rod 3 is provided with an elongated hole 14 that is almost a round hole so that it can be connected to a breaker plate 13 in an ignition distributor.

The method of assembling the vacuum type ignition timing control device 1 and the ignition power distribution device 12 is as shown in FIG. Move to vacuum type ignition timing control device 1 support 4
The circular mounting hole 12a of the ignition distributor housing 12
After inserting the vacuum ignition timing control device 1 into the
a and the elongated hole 14 of the rod 3.

Here, in the case of only the above configuration, the rod 3 moves freely in the long side direction of the long hole 2b of the plate stopper 2 (in the direction of the arrow X shown in Figure 2), so it is difficult to assemble using the above connection method. (This is especially a problem on automatic assembly lines.)

Therefore, in this embodiment, a notch 2c is provided on the surface of the plate stopper 2 on the diaphragm 5 side, and the notch 2c is perpendicular to the elongated hole 2b. By fitting into the plate stopper 2, movement of the rod 3 in the long side direction of the long hole 2b of the plate stopper 2 is restricted.

With this configuration, when negative pressure is introduced into the negative pressure chamber 9, the force generated in the diaphragm 5 and the spring 7 balance each other to displace the rod 3 (advance angle).
let Since the rod 3 is connected to the breaker plate 13 in the ignition distributor, the ignition timing can be controlled by the displacement (advance angle) of the rod 3 in the same way as in the conventional case.

In the above-described embodiment, the plate stopper 2 is provided with the cut groove 2c, but instead of the cut groove 2c, a protrusion 2a may be cut and raised on the plate stopper 2, as shown in FIG. good.
Here, the protrusions 2a may be provided one on each side of the rod 3 so as to sandwich the rod 3, as shown in FIG. 7, but they may also be provided only on one side which will be the upper side of the rod 3 during assembly. There is no problem with automatic assembly.

The ignition signal generator fixed on the breaker plate 13 is not limited to a contact type breaker, but may be a non-contact type breaker such as an electromagnetic pickup or a photo sensor.

[Effect of idea]

As described above, in the present invention, the surface of the plate stopper that the ignition timing control rod comes into contact with at the time of initial setting when no negative pressure is applied to the negative pressure chamber is provided with a cut groove or a concave or convex portion with which the rod engages. Since the protrusion is formed to restrict the movement of the plate stopper in the direction of the long hole, it is possible to prevent the rod from moving along the long hole of the plate stopper during assembly, significantly improving ease of assembly. It has the excellent effect of being able to

[Brief explanation of the drawing]

1 and 2 are a vertical sectional view and a left side view showing one embodiment of the device of the present invention, FIG. 3 is an enlarged perspective view of the plate stopper in the above embodiment, and FIG.
The figure is an enlarged vertical cross-sectional view of the main part of the above embodiment.
6 and 6 are longitudinal cross-sectional views of main parts showing the state in the middle of assembly and the state after assembly, respectively, for explaining the assembly of the above-mentioned embodiment device into an ignition power distribution device for an internal combustion engine, and FIG. FIG. 7 is an enlarged perspective view showing another embodiment of the plate stopper. 2...Plate stopper, 2c...Cutting groove, 3...
...Ignition timing control rod, 9...Negative pressure chamber.

Claims (1)

[Scope of utility model registration request] A diaphragm defining a negative pressure chamber in a case, an ignition timing control rod fixed to the diaphragm and responsive to displacement of the diaphragm, and a plate stopper attached to the case and regulating displacement of the rod. , the rod is provided with a notch by narrowing a portion of the rod, and the plate stopper has a length having a vertical width that allows the wide portion of the rod to be inserted therein and a width that allows only the notch to be inserted. The plate stopper is provided with a hole and the diaphragm side end of the cutout is pressed against the diaphragm side surface of the plate stopper during initial setting when no negative pressure is applied to the negative pressure chamber. 1. A vacuum type ignition timing control device for an ignition power distributor for an internal combustion engine, characterized in that a diaphragm-side surface of the rod is formed with an uneven portion that engages with a diaphragm-side end of the notch of the rod.