JPS59952B2 - Automatic discharge gap adjustment device for multi-pole spark plugs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically adjusting the discharge gap of a multipolar spark plug having a plurality of L-shaped outer electrodes protruding from a metal shell.

Multi-pole spark plugs have a center electrode and a plurality of outer electrodes whose tips are coaxially opposed to each other on the side surface of the tip of the center electrode with a discharge gap in between.Due to errors in component dimensions and assembly errors, each discharge gap There may be cases where the size of the image is not constant.

The size of the discharge gap has an important effect on the ignition performance of an internal combustion engine, so it is required to adjust the size to a constant value, but multi-pole spark plugs are structurally different from normal single-pole spark plugs. However, adjusting the discharge gap is extremely difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a discharge gap adjustment device for a multi-pole spark plug that can automate the adjustment of the discharge gap of a multi-pole spark plug in an extremely efficient manner, and can perform highly accurate and smooth adjustment.

The present invention provides a multi-pole spark hydrant fixing device and a gauge pin in each discharge gap, the part of which should be in contact with the side surface of the tip of the center electrode made of an electrically insulating material, and the part which should be in contact with the tip of the outer electrode made of a conductive material. A discharge gap gauge device is attached to a guide rod so that the two gauges are in contact with the side surface of the tip of the center electrode and arranged in parallel in the axial direction; a detection circuit that electrically detects contact between the outer electrode and the gauge pin; and a detection circuit that electrically detects contact between the outer electrode and the gauge pin; It consists of an outer electrode deforming device that is actuated by a circuit and pushes and bends the outer electrode in the direction of the center electrode and in a direction perpendicular to the center electrode, and also twists around the base, and the outer electrode is bent so that the discharge gap is larger than a specified value. Fix the temporarily bent multi-pole spark plug with a fixing device, place two gauge pins in each discharge gap with a gauge device, and use a deforming device to adjust the outer electrode so that the tip surface of the outer electrode contacts both of the gauge pins. The main idea is to transform the.

The present invention will be explained below based on an embodiment shown in the drawings.

■ is a multi-pole ignition plug, ■ is a fixing device that fixes the ignition plug, and the ignition plug fixing base [phase] in which the ignition plug fitting hole O is formed, and the upper part of the metal shell [phase] from above the ignition plug. A vertically movable holder [phase] that has a spark plug holding hole [phase] that fits externally.
The holder [phase] is driven by, for example, an air cylinder [equipped] attached to the base rod [phase] to move up and down,
Fix the spark plug ■ between it and the fixed base [phase].

■ is a discharge gap gauge device, in which two insulating guides are arranged in parallel in the axial direction in contact with the side surface of the center electrode tip corresponding to the outer electrode [phase] tip surface of the ignition plug, two for each discharge gap. A shock absorber [phase] in which the gauge pin [phase] installed around the rod ■ and the leg section [phase] of the guide rod are supported by a spring [phase].
It is fixed to a fixed base [phase] by a fixed frame [phase].

As shown in Figure 4, the gauge pin [phase] has the part at the tip where the center electrode should come into contact with it shaved off, and is inserted into a round rod made of a hard insulating material such as ceramics [phase] inside a rigid conductive material tube [phase] a such as stainless steel. b
is fitted and attached to the side wall of the guide rod ■.

■ is a detection circuit that detects contact between the tip of the outer electrode [phase] and the gauge pin [phase], and the conductive material tube [phase] of the gauge pin.
It is made by connecting a, the power supply @, and the metal shell [phase] with the power supply @.

■ and ■ are outer electrode displacement devices. ■ is outer electrode 0
This is a device that presses and bends the servo motor toward the center electrode, and the servo motor ■ fixed to the fixing device ■ and the rotating shaft of the servo motor ■
It consists of a pressing rod [phase] screwed into an O-J connected to the central electrode 0.
The tip portion OA presses the bent portion OA of the outer electrode to bend the electrode toward the center electrode.

■ is an outer electrode twisting device, which includes a servo motor O fixed to the substrate 0 and a screw 0 connected to the rotation axis 0 of the motor.
The drive rod 0 is screwed onto the drive rod 0 and has a protrusion [phase], and the drive rod 0 is mounted on the small diameter part [phase] of the support shaft O erected on the substrate O, and the end on the motor side is rotatably fitted to the protrusion [phase]. A matching hole @ is formed, a notch 0 is formed at the other end to loosely engage the tip of the outer electrode @, and the outer electrode torsion arm is rotated around the support axis 0 by the drive rod. The outer electrode 0 is twisted and deformed around the rod-like part 08 that forms the root of the main body.

Next, the discharge gap adjustment effect of the multi-pole spark plug by the discharge gap adjustment device according to the above embodiment will be explained.

Temporarily bend the multi-pole spark plug ■ so that all discharge gaps are slightly larger than the specified value, insert it into the fitting hole ◎, and use the air pressure of the air cylinder [Co., Ltd.] to tighten the holder [phase]. Lower it and fix it between the fixed base [phase] and the holder [phase].

The discharge gap gauge device (■) is installed so that the axis of the guide rod (■) coincides with the axis of the fixed spark plug (■) and the upper end of the guide rod (■) can come into contact with the tip of the center electrode of the spark plug (■). Therefore, the tip of the center electrode is inserted between the gauge pins Z, which are attached to the outer periphery of the guide rod (2) so as to project upwardly into each spark plug discharge gap, in contact with the gauge pins.

At this time, the round bar [phase] b made of insulating material is exposed at the part of the tip of the gauge pin A that comes into contact with the center electrode 0, and the conductive material tube is placed so that the exposed part of the round bar comes into contact with the side surface of the tip of the center electrode 0. [
Phase] is fitted into a.

In this case, the tip of the insulating material rod [phase] b on the center electrode side [phase] C
is rounded and the conductive material tube (c) is attached to the gauge rod (2) so as to have elasticity, so that the tip of the center electrode can be smoothly inserted into the gauge device (2).

Gauge pin [phase] and center electrode tip 0 and outer electrode @
As shown in Figure 6A, the two gauge pins are connected to the center electrode 0.
It comes into contact with the side surface of the tip and is separated from the outer electrode 0.

Next, in order to adjust the discharge gap, a, the servo motor is driven to advance the pressing rod @ toward the center electrode, thereby pushing and bending the outer electrode @ toward the center electrode.

As a result, as shown in FIG. 6 2, if both of the two gauge pins [phase] and [phase] in the discharge gap come into contact with the outer electrode [phase], both detection circuits ■.

(2) closes, energization occurs, and the output signals from the circuits (2) and (2) stop the servo motor (2), completing the adjustment of the discharge gap.

However, if only one of the two gauge pins is in contact with the outer electrode 0 and the other is away from it, as shown in Figure 6, the servo motor is activated by the output signal of the detection circuit ■ on the contact side. O stops, and then the servo motor O is driven to twist and push the center electrode around the base from the direction of the gauge pin that is separated from the outer electrode.

As a result, the gauge pin [phase], the tip of the center electrode 0, and the outer electrode @ are separated from the outer electrode 0 and the two gauge pins [phase] and [phase], as shown in FIG.

Then, the servo motor [phase] is driven again.

Thus both gauge pins [phases]. Operations a and b are repeated until both [phase] come into contact with outer electrode 0, and when both gauge pins [phase] and [phase] come into contact with outer electrode [phase], the adjustment of the discharge gap is completed. do.

Such adjustment work may be done simultaneously or individually for all discharge gaps of the multi-pole ignition plug, and after completing the adjustment of all discharge gaps, return the pressing rod [phase] and the torsion arm ■ to their original positions,
Raise the holder [phase] and remove the multi-pole spark plug ■ from the fixing device.

As shown in Fig. 7, the gauge device may have a structure in which two conductive gauge pins [phases]' are attached to the outside of an insulating rod (2) having a recess (a) that fits into the center electrode (0) for each discharge gap. , in such a configuration, the recess ■'a and the center electrode 0
Adjustment of the discharge gap tends to be inaccurate due to looseness in the fitting between the two, which is necessary for smooth insertion and removal of the tip, and furthermore, if the center electrode tip is deformed, the adjustment becomes even more inaccurate.

Also, since it is necessary to fix the gauge pin [phase]' to the insulating material rod, when one side of the gauge pin [phase]' is in contact with the outer electrode @, the sliding with the outer electrode becomes poor, making it difficult to adjust the discharge gap smoothly. .

In this respect, in the gauge device (2) of the present invention, the gauge pin 4 and the side surface of the tip of the center electrode 0 can reliably come into contact, so the discharge gap can be adjusted accurately, and even if the tip of the center electrode is deformed, the adjustment is possible Be accurate.

Furthermore, since the gauge pin [phase] is not fixed to the tip of the center electrode 0, it acts as a roller and the deformation work of the outer electrode can be done smoothly.

Furthermore, as in the above embodiment, the gauge pig in which the insulating material rod is fitted into the conductive material tube contacts the outer electrode 0 and the bidirectional cylindrical surface of the side surface of the tip of the center electrode 0, so that the action of the rollers is fully exerted. The deformation work of the outer electrode becomes extremely smooth.

Note that it is desirable that the detection circuit, servo motor operating circuit, etc. be non-contact circuits in order to reduce delay in operation.

Furthermore, it is a matter of course that the diameter of the gauge pin is determined by taking into consideration the torsion caused by elasticity during deformation of the outer electrode.

The present invention has the above configuration and includes a spark plug fixing device, a discharge gap gauge device, a detection circuit, and an outer electrode deformation device, so that adjustment of the discharge gap of a multi-pole spark plug can be efficiently automated. Since the gauge pin is in contact with the center electrode, accurate adjustment is possible and the adjustment work is carried out smoothly.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an automatic discharge gap adjustment device according to the present invention,
Figure 2 is a configuration diagram of the outer electrode twisting device, Figure 3 is the detection circuit, Figure 4 is a perspective view of the tip of the discharge gap gauge device, and Figure 5 is a diagram of the configuration of the outer electrode twisting device.
The figure is a cross-sectional view of the same, Figure 6a. Figure 1 shows another embodiment of the discharge gap gauge device. In the figure, ■...Multi-pole spark plug, 2...Spark plug fixing device, ■...Discharge gap gauge device, ■...
...Detection circuit, ■...Outer electrode pushing device, ■...Outer electrode twisting device.

Claims (1)

[Scope of Claims] 1. A fixing device for fixing a multi-polar spark plug, a portion of the multi-polar spark plug that should be in contact with the side surface of the tip of the center electrode is an electrical insulating material, and a portion of the multi-polar spark plug should be in contact with the tip surface of the outer electrode. Two gauge pins made of conductive material are attached to the guide rod in each discharge gap so that they can contact the side surface of the tip of the center electrode corresponding to the tip surface of the outer electrode in parallel in the axial direction. A gap gauge device, a detection circuit that electrically detects the presence or absence of contact between the outer electrode tip surface and the gauge pin, and an output signal of the detection circuit that operates to move the outer electrode toward the center electrode and toward the center electrode. A device for fixing a multi-pole spark plug with an outer electrode temporarily bent so that the discharge gap is larger than a specified value. At the same time, a gauge device is used to arrange two gauge pins in each discharge gap in contact with the center electrode, and then the outer electrode deformation device is activated to fix the two gauge pins with the outer electrode tips arranged in the discharge gap. An automatic discharge gap adjustment device for a multi-pole spark plug that automatically adjusts the discharge gap by deforming the outer electrode until it emits a signal that it contacts both sides. 2. Claim 1, characterized in that the gauge pin has a structure in which a round bar made of a hard insulating material is fitted into a rigid conductive material tube whose tip portion that should come into contact with the center electrode has been cut away.
Automatic discharge gap adjustment device for a multi-pole spark hydrant as described in .