JPH01259515A - Ignition device for individual cylinder of internal combustion engine - Google Patents

Abstract

PURPOSE:To adjust and check ignition timing by a timing light of an induced voltage detection type by electrically insulating an ignition coil iron core from an internal combustion engine body and forming an induced voltage detector component on the iron core. CONSTITUTION:In idling operation, a primary current is conducted intermittently through a primary coil 9 via a power supply cord connected to a power supply primary terminal and a high tension secondary voltage is induced on a secondary coil 11. The secondary coil 11 and an iron core 7 are coupled via a capacitor, and the iron core 7 is electrically insulated from a cylinder head 2 by means of an insulating connecting tube 21. Accordingly, the secondary voltage induced on the secondary coil 11 is detected through an induced voltage detection cord 31 to turn a timing light on and off in synchronism with the detected voltage. Thus, ignition timing can be adjusted and checked.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a cylinder-specific ignition system for an internal combustion engine that eliminates high-tension cords.

"Conventional technology" Between the ignition coil and the distributor, and between the distributor and the spark plugs installed in each cylinder,
Connect with high tension cord.

In the case of an ignition system that distributes the high voltage induced in the secondary coil of the ignition coil to each spark plug, connect the induced voltage detection cord of a timing light of the induced voltage detection type to the high tension cord. The timing light, which detects the induced voltage and flashes in synchronization with the voltage, allows inspection of the ignition timing and adjustment of the rA.

``Problem to be solved by the invention'' However, in the case of a cylinder-specific ignition system in which the ignition coil is directly assembled to the spark plug, the high tension cord has been abolished, so the induced voltage detection In the type timing light,
It is not possible to inspect or adjust the ignition timing, which is disadvantageous in that a highly sensitive primary current detection type timing ride that can detect the ignition timing from the primary coil of the ignition coil must be used.

The present invention aims to solve the above-mentioned disadvantages,
It is an object of the present invention to provide a cylinder-specific ignition system for an internal combustion engine that allows adjustment and inspection of ignition timing in the conventional manner using an induced voltage detection type timing light.

"Means for Solving the Problem J" A specific means for achieving the above object is to electrically insulate the iron core of the ignition coil from the internal combustion engine main body in the cylinder, and to install an induced voltage detection section in the iron core. It is characterized by the fact that it has been formed.

"Function" As clarified in the description of the specific means, the present invention provides electrical insulation of the iron core of the ignition coil from the internal combustion engine main body, and also forms an induced voltage detection section in the iron core. When the induced voltage detection cord of the induced voltage detection type timing light is connected to the induced voltage detection section and the idling operation is performed, the iron core and the internal combustion engine body are electrically insulated, and the core and the secondary What is a coil?
Since there is a so-called capacitor-coupled state everywhere, the secondary voltage induced in the secondary coil can be detected by the timing light via the cord connected to the cord connecting end, and the ignition timing This allows for adjustments and inspections.

"Example" Embodiments of the present invention will be described based on the accompanying drawings.

1 is an internal combustion engine body, and a spark plug 4 is installed in a screw hole 3 formed in a cylinder head 2 of the engine body. Reference numeral 5 denotes an ignition coil, which is fork-shaped and has a laminated iron core 7 whose upper end is integrally punched with a protruding end 6 for connecting a cord. A bobbin 10 wound with a primary coil 9 is fitted into the central core 8 of the iron core 7, and a bobbin 12 wound with a secondary coil 11 is fitted on the outside thereof,
These coils are inserted into the bobbin mounting hole 14 formed in the coil case 13, and the left and right outer cores 15.1 of the iron core 7 are inserted.
5 in the outer core fitting groove 16 provided in the case 13. It fits into the i6 and is fixed. Further, the internal space of the case 13 is filled with insulating oil or an insulating compound 17 to maintain insulation. A cylindrical protrusion 18 is provided at the lower end of the coil case 13.
A conductive piece 19 connected to the winding end of the secondary coil 11 by a conductive member 11a is fixed therein, and an end of the coil spring 20 is connected and fixed to the piece 19. Reference numeral 21 denotes an insulating connecting tube fitted around the outer periphery of the cylindrical protrusion 18, which is tightly fitted into the insulating insulator 4a of the spark plug 4, and has a flange 22 in contact with the cylinder head 2 to connect it to the ignition coil 5. The cylinder head 2 is assembled directly to the spark plug 4 while ensuring electrical insulation between the cylinder heads 2. At this time, the conductive piece 19
A coil spring 20 connected and fixed to elastically contacts the terminal 4b of the spark plug 4 to ensure electrical connection. Others 23 and 24 are primary terminals for power supply connected to the winding start end and the winding end end of the negative coil 9, to which the power cord 25 is connected.

In the cylinder-specific ignition system of an internal combustion engine having the above configuration, when adjusting and inspecting the ignition timing using an induced voltage detection type timing light, the induced voltage connected to the timing light (not shown) A clip 32 provided at the end of the detection cord 31 is used to connect the ignition coil 5 to the upper end of the iron core 7 of the ignition coil 5 by sandwiching the cord connection protrusion 6, and to perform idling operation of the internal combustion engine. , then the primary terminal 23.2 for power supply
A primary current intermittently flows through the primary coil 9 through the power cord 25 connected to the power source 4 by actuation of a breaker (not shown), and a high secondary voltage is induced in the secondary coil 11.

The secondary coil 11 and the iron core 7 form so-called capacitor coupling everywhere, and electrical insulation is ensured between the iron core 7 and the cylinder head 2 by the insulating connecting pipe 21, so the secondary coil 11 is detected through the induced voltage detection cord 31 at a level equal to or higher than that when a conventional high tension cord is used, and the timing light flashes in synchronization with the voltage. By blinking the timing light, the ignition timing can be adjusted and inspected in the conventional manner.

The protruding end 6 for connecting the cord at the upper end of the iron core 7 can be formed into any shape by punching a press die, and can also be formed by stacking a large number of punched steel plates. Since it is not necessary to form the film using the same material, an increase in production cost can be avoided.

In this embodiment, the protruding end portion 6 is used as an example of the induced voltage detecting portion, but the cord 31 may be of a plug type and the iron core 7 may be provided with a recessed portion.

"Effects of the Invention" As clarified in the description of the specific means and effects, the present invention provides electrical isolation of the iron core of the ignition coil from the internal combustion engine main body, as well as forming an induced voltage detection section in the iron core. By connecting the induced voltage detection cord of the induced voltage detection type timing light to the induced voltage detection section, the secondary voltage induced in the secondary coil can be detected. Even if a repair shop etc. is not equipped with a highly sensitive primary current detection type timing ride that is necessary for inspecting and adjusting the ignition timing of the cylinder-specific ignition system, they will not be able to inspect and adjust the ignition timing of the cylinder-specific ignition system. This has the effect of making adjustments to meet customer needs.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, with FIG. 1 being a longitudinal sectional front view of the central part of the main part, and FIG. 2 being a plan view. 110. Internal combustion engine body, 211. spark plug, 5
11. Ignition coil, 610. protruding end for cord connection, 716. Iron core, 21,, insulating connecting tube.

Claims (1)

[Claims] In cylinder-specific ignition systems for internal combustion engines, in which the ignition coil is directly attached to the spark plug installed in each cylinder,
An ignition device for each cylinder of an internal combustion engine, characterized in that the iron core of the ignition coil is electrically insulated from the internal combustion engine main body, and an induced voltage detection section is formed in the iron core.