JPS59195811A - Simultaneous ignition coil for internal combustion engine - Google Patents

Abstract

PURPOSE:To improve the secondary voltage of a simultaneously ignition coil and use the coil for two-point ignition by a method wherein a capacitor is connected between a hole provided to the tip of a high voltage terminal and a core for engine grounding and casting insulation is applied containing the capacitor. CONSTITUTION:Two L-shape tabs 2a, 2b, which extend to the radial direction, are formed to the high voltage side end surface of a secondary bobbin 2. High voltage terminals 4a, 4b are pushed and fixed into penetration holes formed in the tabs 2a, 2b respectively. An ignition coil is fixed to a body frame and grounded to the engine by fitting holes 1a, 1b formed to the projecting ends of a core 1. In this configuration, a capacitor (50-150pF) 11 is connected to one secondary output terminal VB, for instance to a winding end high voltage terminal 4b, to increase the voltage VA of another output terminal so that the jump spark ignition is performed by an ignition plug 8 of VA side first. After that, as the output voltage of VB side is increased by the jump sparks of the ignition plug 8 of VA side, the jump spark ignition is continued by an ignition plug 9 of VB side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an internal engine simultaneous ignition coil with 5
It connects a 0 to 150 PF capacitor and ignites two points in the engine cylinder.The purpose is to improve combustibility by improving the secondary discharge circuit structure of the simultaneous ignition coil (simultaneous ignition for 1 cylinder and 2 plugs). (uses 1 ignition coil).

The conventional type uses two ignition coils for two-point ignition, which increases the cost.

Additionally, simultaneous firing coils that output from the beginning and end of the winding of the secondary coil were used for two cylinders due to the secondary generated voltage, and were used by causing unnecessary firing on one side. This is because a sufficient secondary voltage cannot be secured when the secondary is open. Therefore, it was unsuitable for 2-point ignition.

The present invention improves the secondary voltage of the simultaneous ignition coil so that it can be used for two-point ignition. To this end, a capacitor (a high-voltage small ceramic capacitor) is connected to one side of the secondary output. Since the secondary voltage is an LC high-frequency discharge, such a capacitor will become a short circuit (equivalent to ground).
The secondary voltage of other devices becomes high. Therefore, plug discharge is ensured. When a plug discharge occurs at the other end, it becomes grounded, so the secondary voltage of VB on the side connected to the capacitor becomes high, and a series gear discharge, that is, two-point ignition occurs. In addition, the capacitor capacity value is 50 to 150PF due to the secondary voltage, and the required plug voltage is 15KV.
Ensure the voltage is higher than that.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 1 to 4, a core 1 for engine grounding is inserted into the second bobbin 16, a split-wound secondary bobbin 2 is placed around the outer periphery of a primary coil (not shown) wound around the outer periphery of the second bobbin 16, A secondary coil 3 mounted on the secondary bobbin 2, each high voltage terminal 4a, 4b outputting a terminal consisting of a winding start wire and a winding end wire, a protrusion 5a of each high voltage terminal 4a, 4b around which each of the terminal wires is wound, 5b, each high voltage cord 6 transmitting each output of the winding start side high voltage terminal 4a and the winding end side high voltage terminal 4b to the spark plugs 8 and 9, respectively.
, and 7, the engine 10, the lead wire 12 on one side of the capacitor 11 to be inserted into the head hole 41 of the high voltage terminal 4b and fixed by soldering, and the lead wire 17 on the other side to be grounded to the core 1 by soldering. Cut-and-raise protrusion 1 provided
3. It consists of a case 14 that houses the parts of the ignition coil including the capacitor 11, and a casting resin 15 injected into the case 14 to insulate and fix each part. Further, two L-shaped tongue pieces 2a, 2b extending in the radial direction are formed on the high-pressure side end surface of the secondary bobbin 2, and each high-pressure terminal 4a, 4b is inserted into a through hole 2C formed in the tongue pieces 2a, 2b. is press-fitted and fixed.

In addition, mounting holes 1 are formed at both ends of the core 1 that protrude to the outside.
The ignition coil is fixed to the frame of the vehicle body and grounded to the engine by means of a and lb.

In the above configuration, one side of the secondary output terminal V of the simultaneous ignition coil
B, for example, connect a capacitor (50 to 150PF) 11 to the winding end side high voltage terminal 4b, and set the other output voltage V
Amplify A, and first spark it with spark plug 8 on the VA side. After that, the output voltage on the Ve side is amplified by the spark of the VA side spark plug 8, so the VB side spark plug 9 continues.
It starts to catch fire. In other words, 2-point ignition is possible with one ignition coil.

In addition, the lead wire of the capacitor 11 is connected and fixed between the hole 41 provided in the high voltage terminal 4b fixed to the secondary bobbin 2 and the core 1 for engine grounding, and the capacitor 11 is insulated by casting. The capacitor 11 can be easily built into the ignition coil, and the lead wires of the capacitor 11 can be insulated at the same time.

Figure 5 shows the secondary voltage characteristics with respect to the capacitance of the capacitor 11.
50 (PF), secondary voltages VA and VB that satisfy the required voltage (15 KV) can be obtained at each end of the secondary coil 3.

[Brief explanation of the drawing]

Figures 1 and 2 are internal transparent left side views and vertical cross-sectional views showing one embodiment of the coil of the present invention, Figure 3 is an electric circuit diagram of the above embodiment, and Figure 4 is an enlarged view of the main parts of the above embodiment. The cross-sectional view and FIG. 5 are secondary voltage characteristic diagrams with respect to capacitor capacitance in the above embodiment. DESCRIPTION OF SYMBOLS 1...Core, 2...Secondary bobbin, 2C...Through hole, 3...Secondary coil, 4a, 4b...-High voltage terminal, 11...Condenser, 12.17... Lead wire, 15...casting resin, 41...hole. Representative patent attorney Takashi Okabe 4th figure 1J 5th figure C5 sei-ir (PF)

Claims (1)

[Claims] A high-voltage capacitor of 50 to 150 PF is connected to the output end of one side of the ignition coil, which outputs the winding start and winding end of the secondary coil, and the split-winding secondary bobbin is used for ignition at two points in the engine cylinder. It has a high voltage terminal fixed in a through hole provided on the end face, and the lead wire of the capacitor is connected and fixed between the hole provided in the head of this high voltage terminal and the core for engine grounding, and the capacitor including this capacitor is fixed. Simultaneous ignition coil for internal combustion engines made of cast insulated material.