JP3042571B2 - Distributor for internal combustion engine and electromagnetic signal generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic signal generator used in a power distribution device for an internal combustion engine and the like, and more particularly to an electromagnetic signal generator capable of preventing a control device of an internal combustion engine from being destroyed by application of a high voltage.

[0002]

2. Description of the Related Art In a power distribution device for an internal combustion engine, when a high-voltage electric wire connecting the outside of a power distribution cap side electrode and a spark plug is disconnected at a connection portion or the like and becomes non-conductive, not a power distribution cap side electrode but another power supply terminal is used. A high voltage is applied to the metal part from the distribution rotor. In the case of a structure in which the electromagnetic signal generator for detecting the rotation speed of the power shaft of the internal combustion engine and the power distribution cap side electrode are arranged to face each other, a high voltage is applied to the terminal of the electromagnetic signal generator, The electronic control unit of the internal combustion engine connected to the engine is destroyed. In order to prevent this, conventionally, as shown in Japanese Utility Model Laid-Open No. 2-122170, an electromagnetic signal generator is covered with an electrically insulating member. For this reason, the number of parts and the weight increase, and there has been a problem of an increase in cost, which impairs the workability of assembling the distributor.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to prevent the application of a high voltage to an electromagnetic signal generator, thereby preventing the destruction of an electronic control unit of an internal combustion engine. It is another object of the present invention to prevent a rise in cost by adopting a simple configuration.

[0004]

The above object can be attained by providing a conductive member which is electrically connected to the ground potential near the terminal of the electromagnetic signal generator. Further, the above object can be achieved by forming the conductive member by bending or extending a part of the stator in contact with the permanent magnet of the electromagnetic signal generator.

[0005]

Since the conductive member is electrically connected to the ground potential,
It has a function as a lightning rod. As a result, the high voltage is more easily applied to the conductive member near the terminal than the terminal of the electromagnetic signal generator, and the application of the high voltage to the terminal can be prevented. Further, since the conductive member is formed by bending or extending a part of the stator, the conductive member can be easily formed, the number of parts and the weight increase as in the prior art, and the assembly work of the power distributor. The deterioration of the performance is eliminated, and an increase in cost can be suppressed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

In FIG. 1, a shaft 1 includes a housing 2
The shaft 1 is provided with a reluctor 3 having a predetermined convex portion or groove and a power distribution rotor 4. The electromagnetic signal generator 5 is attached to the bottom of the housing 2 so as to face the reactor 3. The power distribution cap 6 is mounted on the opening side of the housing 2.

In the power distribution device for an internal combustion engine having such a structure, the shaft 1 rotates in synchronization with the power shaft of the internal combustion engine (not shown), and the convex portion or the groove portion of the reluctor 3 attached to the shaft 1 has the housing 2. Is detected by the pole piece 8 of the electromagnetic signal generator 5 attached to the power supply and an output signal is obtained. The output signal obtained here is output from the terminal 11 of the electromagnetic signal generator 5 to the outside of the power distribution device via a signal line (not shown), and is input to an electronic control unit (not shown) of the internal combustion engine to set the ignition timing of the internal combustion engine. Is calculated. This ignition timing is transmitted to an ignition coil (not shown) to generate a high voltage,
A high voltage is transmitted from the central electrode 62 of the power distribution cap 6 to the power distribution rotor 4, transmitted from the power distribution rotor 4 rotating together with the shaft 1 to the power distribution cap side electrode 61, and distributed from a high-voltage electric wire (not shown) to a spark plug (not shown). You.

Next, the configuration of the electromagnetic signal generator 5 of the present invention will be described below.

In FIG. 2, a pole piece 8, a permanent magnet 9, a pickup coil 10, and a stator 14 are incorporated in a molded resin bobbin 7.
A pickup coil 10 which is electrically insulated by the pole piece 8 and the bobbin 7 is wound around the outer periphery of the pole piece 8, and terminals 11 respectively connected to the start and end of the coil winding are insert-molded to form a U-shape. And a stator 14 that covers the two outer side surfaces of the bobbin 7 and is in contact with the permanent magnet 9 is insert-molded. A portion of the stator 14 is extended and has mounting feet 13 for mounting the electromagnetic signal generator 5 inside the power distributor. Further, another part of the stator 14 is extended and bent near the terminal 11.

In the above-described power distribution device, considering that a high-voltage electric wire for transmitting a high voltage to a spark plug (not shown) of the internal combustion engine is detached from the power distribution cap 6, the high voltage is distributed from the power distribution rotor 4. The power is not distributed to the cap-side electrode 61 but is distributed to another metal part inside the distributor, and a high voltage is applied. Unless measures are taken to prevent this high voltage from being applied to the terminal 11 of the electromagnetic signal generator 5, the high voltage is transmitted through a signal line (not shown) and is applied to an electronic control unit of an internal combustion engine (not shown) to The control device is destroyed. However, in the present invention, since the stator 14 that is electrically connected to the ground potential is extended and bent in the vicinity of the terminal 11 of the electromagnetic signal generator 5, the extension 12 is provided. Thus, application of a high voltage to the terminal 11 can be prevented, and destruction of an electronic control unit (not shown) of the internal combustion engine can be prevented. further,
Since the lightning rod is originally obtained by additionally processing a part of the stator 14 which is a component of the electromagnetic signal generator 5, it can be manufactured at low cost and increase in cost can be prevented.

FIG. 3 shows a second embodiment of the present invention. This embodiment is different from the embodiment of FIG.
2 has a slightly different shape, and is provided with an inclined portion by bending twice. In the present embodiment, the height of the extension portion 12 is made higher than that of the embodiment of FIG. 2 and the inclined portion is brought closer to the terminal 11, whereby the effect of the lightning rod is more reliably aimed.

FIG. 4 shows a third embodiment of the present invention. A part of the stator 14 on the opposite side to the reluctor 3 of the power distributor is extended in the direction of the terminal 11 so that the function of a lightning rod is imparted to the extension 12. In this embodiment, since there is no bent portion, it can be manufactured at lower cost than in the first embodiment.

[0014]

According to the present invention, the application of a high voltage to the electromagnetic signal generator can be prevented, whereby the destruction of the electronic control unit of the internal combustion engine can be prevented. Further, since the object can be achieved with a simple configuration, an increase in the number of parts and weight, deterioration in workability of assembling the distributor, a problem of interference with other components, and the like can be solved, and an increase in cost can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a distributor for an internal combustion engine incorporating an electromagnetic signal generator according to the present invention.

FIG. 2 is an electromagnetic signal generator according to a first embodiment of the present invention.

FIG. 3 is an electromagnetic signal generator according to a second embodiment of the present invention.

FIG. 4 shows an electromagnetic signal generator according to a third embodiment of the present invention.

[Explanation of symbols]

3 ... reactor, 5 ... electromagnetic signal generator, 7 ... bobbin, 1
0: pickup coil, 11: terminal, 12: extension,
14 ... Stator.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideki Otsuki 2477 Kashimayatsu, Kata-shi, Ibaraki Pref. Hitachi Automotive Engineering Co., Ltd. Examiner Hiroshi Abe Hiroshi Abe (56) Reference Shokai Sho 64- 36670 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) F02P 7/067 F02P 7/00

Claims (4)

(57) [Claims] 1. A shaft 1 which rotates in synchronization with the rotation of a power shaft of an internal combustion engine, a reactor 3 which is coupled to the shaft 1 and rotates integrally and has a convex portion or a groove portion, a pole for detecting a change in magnetic flux A piece 8, a permanent magnet 9 in contact with the pole piece 8, and a stator 14 forming a magnetic circuit with the permanent magnet, and a change in the presence or absence of the convex portion or the groove portion is detected by rotation of the retractor 3. An electromagnetic signal generator 5 for generating a signal; a power distribution rotor 4 coupled to the shaft 1 and rotating integrally and supplying a high voltage to the power distribution cap side electrode 61
An internal combustion engine power distribution device comprising: an electromagnetic signal generator 5 and a conductive member 12 that is electrically connected to a ground potential; 2. A shaft 1 which rotates in synchronization with the rotation of a power shaft of an internal combustion engine, a reactor 3 which is coupled to the shaft 1 and rotates integrally and has a convex portion or a groove, and a pole for detecting a change in magnetic flux. A piece 8, a permanent magnet 9 in contact with the pole piece 8, and a stator 14 forming a magnetic circuit with the permanent magnet, and a change in the presence or absence of the convex portion or the groove portion is detected by rotation of the retractor 3. An electromagnetic signal generator 5 that generates a signal and outputs the signal through a terminal 11 for electrical connection, is coupled to the shaft 1, rotates together, and supplies a high voltage to a distribution cap side electrode 61. Power distribution rotor 4
In the power distribution device for an internal combustion engine, the terminal 11 and the power distribution cap-side electrode 61 are disposed so as to face each other, and the conductive member 12 that is electrically connected to the ground potential near the terminal 11 is connected to the stator 14. A distributor for an internal combustion engine, which is extended and provided in the electromagnetic signal generator 5. 3. A pole piece 8 for detecting a change in magnetic flux; a permanent magnet 9 in contact with the pole piece 8; a stator 14 having a mounting leg 13 in contact with the permanent magnet 9 to form a magnetic circuit; A pickup coil 10 for inducing a voltage due to a change in magnetic flux of the pole piece 8, a resin bobbin 7 for holding these by integral molding, and a terminal 11 connected to the pickup coil 10. In the signal generator, on the side of the bobbin 7 where the terminal 11 is provided, a part of the stator 14 is extended and bent so that the terminal 11
An electromagnetic signal generator characterized in that an extension part 12 is arranged near the device. 4. A pole piece 8 for detecting a change in magnetic flux, a permanent magnet 9 in contact with the pole piece 8, a stator 14 in contact with the permanent magnet 9 to form a magnetic circuit, and having a mounting foot 13. A pickup coil 10 for inducing a voltage due to a change in magnetic flux of the pole piece 8, a resin bobbin 7 for holding these by integral molding, and a terminal 11 connected to the pickup coil 10. In the signal generator, a part of the stator 14 on the side opposite to the side where the pole piece 8 detects a change in magnetic flux is extended to the side of the bobbin 7 where the terminal 11 is provided, and the terminal 11 An electromagnetic signal generator characterized in that an extension part 12 is arranged near the device.