JPS6145336Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an engine ignition system in which a semiconductor amplifier circuit having an ignition function is configured as a single ignition unit, and this unit is built in a power distributor housing.

As a prior art example of this type, proposed in Japanese Utility Model Publication No. 44-30818 is one in which an electronic circuit for detecting the ignition position is set and fixed in a cutout hole formed in a movable plate.

However, with this device, it is impossible to fix the semiconductor amplifier circuit having the ignition circuit function, which is the purpose of the present invention, to the movable plate because the mounting space is extremely small and the heat dissipation effect is extremely poor. be.

Furthermore, a device with an ignition amplifier built into the housing has been proposed as Japanese Patent Publication No. 45-26527.

However, even with this device, the power transistors that make up the ignition amplifier are mounted individually and directly attached to the bottom of the housing, making the installation work extremely difficult. This is because a governor advance device is not required.

This invention is an engine ignition system that solves each of the above-mentioned disadvantages.

Hereinafter, a detailed explanation will be given with reference to the embodiments shown in FIGS. 1 to 6. In the figures, 1 is a housing of a power distributor, which is made of aluminum or the like with good heat dissipation, and has a large inner surface. catch seat 1 having
A pair of protrusions 1b, which are positioning portions A, are formed at two locations approximately symmetrical to a, and screw holes 1c are formed at two locations. 2 is this housing 1
A rotary shaft supported via a bearing 3, 4 a cylindrical body loosely fitted on this rotary shaft 2, 5 a ring-shaped signal rotor fitted on this cylindrical body 4, and an engine on its outer periphery. Number of cylinders (4 cylinders in this example, so
2) protrusions 5a are formed. Reference numeral 6 denotes a movable plate that is rotatably supported on the housing 1 around the rotating shaft 2, and a connecting pin 7 is attached at one location of the movable plate.
is pivotally mounted, and a link 9 of a vacuum advance device 8 is loosely fitted onto this connecting pin 7. A stator 10 is fixed on the movable plate 6 via a permanent magnet 11, and has three protrusions 10a that can face each protrusion 5a of the rotor 5 with a gap therebetween. Reference numeral 12 designates a signal unit fixed to the housing 1, which includes a bobbin portion 12a, a pair of support portions 12c having mounting holes 12b, a pair of connector housing portions 12d extending from these support portions 12c, and a signal unit 12d extending from the housing portions 12d. Each protrusion 1b extends
A pair of positioning parts 12, which are positioning parts B that engage with
e, and a cover portion 12f. These bobbin portion 12a, attachment hole 12b, support portion 12c, housing portion 12d, and positioning portion 12e are integrally molded from synthetic resin or the like. 14 and 15 are connector terminals for winding start and winding that extend in the radial direction and are fixed to the upper part of the bobbin portion 12a of the signal unit 12; 16 is a signal coil wound around the bobbin portion 12a of the signal unit 12; The beginning of the winding is connected to the connector terminal 14 for the start of winding, and the end of the winding is connected to the connector terminal 15 for the end of winding. 7 is the above signal coil 1
A semiconductor amplifier (consisting of an integrated circuit, etc.) has an ignition circuit function that receives an ignition signal from 6 and intermittents the primary current of the ignition coil to generate an ignition voltage on the secondary side of the ignition coil. In the built-in ignition unit, a pair of mounting portions 17b having mounting holes 17a are formed. 18 is each mounting part 1
An output terminal 7b is formed to protrude in the radial direction and is led out to the ignition coil, and 19 is a pair of input terminals that are spaced apart from each other in the center of the main body of the ignition unit 17 and are formed to protrude in the radial direction. It is fitted and connected to each connector terminal 14, 15. 20 is a metal cover for a heat sink partially buried under the ignition unit 17. In addition, the mounting hole 17a, the mounting part 17b, each terminal 18, 19, and the metal cover 20
is integrally formed when the ignition unit 17 is molded.
Further, the mounting portion 17b of the ignition unit 17 is fitted in the support portion 12c of the signal unit 12 in the radial direction,
At this time, the output terminal 18 is housed and held in the housing part 12d, and the mounting holes 12b and 17a match,
Moreover, the input terminal 19 is fitted and connected to the connector terminals 14 and 15. A pair of tightening screws 21 fix the ignition unit 17 and the signal unit 12 together to the housing 1, and are screwed into the screw holes 1c of the housing 1 through the respective mounting holes 12b and 17a.
At this time, the lower metal cover 20 of the ignition unit 17 is in contact with the opening seat 1a of the housing 1. A pair of lead wires 22 are connected to connector terminals 23 which are fitted and connected to each output terminal 18 of the ignition unit 17, and are connected to the ignition coil via a grommet 24 fixed to the housing 1. The connector terminals 23 are inserted into each housing portion 12d of the signal unit 12 and held therein. 25 is a cam type governor advance device attached to the tip of the cylinder body 4, 26 is its governor base, and 26a is the 2 symmetrical part of this governor base 26.
A screw hole 26b is formed by the mounting piece formed at this location. Reference numeral 27 denotes a half-bowl-shaped power distribution rotor fixed to the governor base 26, and has an opening 27a formed therein, and the opening 27a is formed in a size large enough to expose the ignition unit 17. A pair of tightening screws 28 fix the power distribution rotor 27 by screwing into the screw holes 26b of the governor base 26;
A rotor electrode 9 is fixed to the upper part of the power distribution rotor 27, one end of which is in sliding contact with the center electrode 30, and the other end of which can face each of the peripheral electrodes 31 in turn. Reference numeral 32 denotes a power distributor cap that is fitted and fixed to the housing 1, and each center and peripheral electrodes 30, 31 are fixed thereto.

Next, to explain the operation of the embodiment in detail, first, when the rotating shaft 2 is rotated in the direction of the arrow by the engine,
Since the cylinder 4 is rotated via the governor advance device 25 and the signal rotor 5 is rotated, its four protrusions 5a approach, oppose, and separate from the three protrusions 10a of the stator 10, respectively. Then, the permanent magnet 11 is rotated by the rotation of the protrusion 5a of the signal rotor 5.
A change occurs in the interlinkage magnetic flux from the rotor, and a signal voltage corresponding to the rotation axis is generated in the signal coil 16. This signal voltage is input from the winding start and winding terminals 14 and 15 to the input terminal 19 of the ignition unit 17, so that the semiconductor amplifier in the ignition unit 17 is connected from the lead wire 22 to the connector terminal in accordance with the engine ignition timing. 23, the primary side current of the ignition coil, which is energized through the output terminal 18, is intermittent to induce an ignition voltage on its secondary side. This ignition voltage is guided to the center electrode 30 and is sequentially distributed to each peripheral electrode 31 through the rotor electrode 29 of the rotating power distribution rotor 27 .

Now, the signal unit 12 and the ignition unit 17
In detail, the diameter and depth of the housing 1 are usually the same as the diameter and axial dimensions of each component installed within it, and when the power distributor body is installed on the engine, the diameter and depth of the housing 1 are It has been determined that it will not interfere with the included auxiliary equipment. Therefore, it is extremely important how to fit the ignition unit 17, which has a large volume, into the current housing 1 without increasing the diameter and depth of the housing 1, and it is also easy to install and remove the ignition unit 17. We must be able to do so.

Therefore, in the embodiment of the present invention, there is a relatively large space between the signal generating section and the governor advance device 25, and in the case of a four-cylinder engine, the protrusion 1 of the stator 10
Even if 0a is reduced from 4 to 3, the signal coil 16
The ignition unit 17 is removably installed in this space after confirming that it has almost no adverse effect on power generation.

That is, among the four protrusions 10a of the stator 10,
One protrusion on the side opposite to the link 9 is removed, and an opening receiving seat 1a having a wide area extending in the axial direction is formed at the bottom of the housing 1 corresponding to the position of this protrusion, and the axial support is provided at two symmetrical locations. A pair of protrusions 1b extending in the direction are formed.

Thus, the signal unit 12 is inserted through the opening of the housing 1, each of its supporting parts 12c is brought into contact with each of the opening seats 1a, and at the same time each positioning part 12e is engaged between the pair of protrusions 1b. Hold position. Then, the connector terminals 23 from the ignition coil are inserted into each housing portion 12d of the signal unit 12 and stored therein. Next, the ignition unit 17 is inserted radially through the opening of the housing 1, and at this time its mounting portion 17b is inserted into each support portion 1 of the signal unit 12.
2c, and the metal cover 20 of the ignition unit 17 is held in contact with the opening seat 1a of the housing 1.

Then, the support part 12c of the signal unit 12
and each mounting hole 1 of the mounting portion 17b of the ignition unit 17.
2b and 17a match, so if the tightening screw 21 is inserted through each of the mounting holes 12b and 17a and screwed into the threaded hole 1c of the housing 1, the signal unit 12 and the ignition unit 17 are connected to the housing 1. The assembly of the signal unit 12 and the ignition unit 17 is completed by fixing them integrally.

By the way, since the ignition unit 17 is overused, there is a possibility of it breaking down, and in this case, the ignition unit 1
Only 7 needs to be replaced with a new one.

A major feature is that the ignition unit 17 can be easily removed without removing the governor advance device 25 and the power distribution rotor 27.

That is, by artificially rotating the power distribution rotor 27,
The tightening screw 21 is exposed through the opening 27a, and is removed by loosening it with a screwdriver.Then, by manually pulling the ignition unit 17 in the direction of the arrow shown in FIG. The housing 1 is removed from the support part 12c.
It will be removed from. Therefore, the installation of a new ignition unit 17 is done in the reverse order of the removal process, that is, insert the ignition unit 17 in the opposite direction of the arrow, fit its mounting part 17b into the support part 12c of the signal unit 12, and then ignite it. The unit 17 and the signal unit 12 are connected to the housing 1 by tightening screws 21.
It can be fixed integrally with the

During the installation and removal work of the ignition unit 17, the signal unit 12 moves because the positioning part 12e of its support part 12c is engaged between the protrusions 1b of the housing 1 even if it is removed by loosening the tightening screw 21. Therefore, the ignition unit 17 can be installed and removed smoothly.

According to the embodiment of the present invention constructed and operated as described above, the following features can be obtained. That is, the four protrusions 1 of the stator 10 are formed in the same number as the number of engine cylinders.
0a, the protrusion located on the side opposite to the link 9 is removed and the ignition unit 17 is installed in this space, so the ignition unit 17 can be built into the housing 1 without increasing the diameter and depth of the housing 1. Moreover, since the ignition unit 17 is fixed by bringing the metal cover 20 into contact with the opening seat 1a of the housing 1, the heat generated by the ignition unit 17 is quickly conducted from the metal cover 20 to the housing 1 via the opening seat 1a. , heat is efficiently radiated from the entire surface of the housing 1, and the ignition unit 17 exhibits stable operation. Furthermore, the opening catch 1 of the housing 1
Since the ignition unit 17 is fixed at the point a, the ignition unit 17 can be installed and removed from the radial direction of the arrow without removing the governor advance device 25 and the power distribution rotor 27, making the installation and removal work extremely easy. During the installation and removal work of the ignition unit 17, even if the tightening screw 21 is loosened, the signal unit 12 is held in position by the positioning portion 12e of the signal unit 12 engaging between the protrusions 1b of the housing 1. Since the signal unit 12 does not shift its position, the ignition unit 17 can be attached and detached extremely easily. Moreover, the opening 27 of the power distribution rotor 27
Since the tightening screw 21 and the connector terminal 23 are exposed from the part a, the ignition unit 17
The fixing and connecting work during attachment/detachment work can be easily performed without removing the governor advance device 25 and the power distribution rotor 27. Further, since the ignition unit 17 and the signal unit 12 are integrally fixed to the housing 1 by a pair of tightening screws 21, it is possible to install the ignition unit 17 inside the narrow housing 1, and the ignition unit 17 and signal unit 1
The number of mounting seats, tightening screws, etc. can be reduced to 1/2 compared to when mounting 2 individually.

Note that the present invention is not limited to the above-mentioned embodiments, but includes various embodiments. For example, in addition to the ignition function, the ignition unit 17 may also include an ignition timing control function that receives an ignition signal and automatically advances or retards the engine ignition timing in response to various control signals.
In this way, the governor advance device 25 can be abolished.
Further, the present invention can also be applied to a device in which the governor advance device 25 is installed at the bottom. Furthermore, the protrusion 10a of the stator 10
The number of protrusions is arbitrarily set depending on the number of cylinders, and the number of protrusions to be removed at this time needs to be set within a range that does not reduce the accuracy of the ignition signal and in accordance with the installation space of the ignition unit 17.

As described above, in this invention, the signal unit is held in position with respect to the housing by engaging the positioning part B of the housing with the positioning part A of the housing, so that the ignition unit fitted to the signal unit can be attached and removed. At this time, when the signal unit and the ignition unit are screwed together with the tightening screw or unscrewed, the position of the signal unit does not move, and the work of attaching and detaching can be easily performed.

Moreover, since the signal unit and the ignition unit can be easily attached and detached, an excellent practical effect is obtained in that the ignition unit and the signal unit can be automatically assembled.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of this invention, FIG. 2 is a plan view showing how the signal unit 12 and ignition unit 17 are installed, and FIG. 3 is a plan view showing how the distribution rotor 27 is installed. 4 is a plan view showing the inside of the housing 1, FIG. 5 is a perspective view of the signal unit 12 and the ignition unit 17, and FIG. 6 is a plan view of the main part of the signal unit 12. In the figure, 1 is a housing, 1a is an opening seat, 1b is a protrusion, 1c is a screw hole, 2 is a rotating shaft, 3
is a bearing, 4 is a cylinder, 5 is a signal rotor, 5a,
10a is a protrusion, 6 is a movable plate, 7 is a pin, 9
is a link, 10 is a stator, 11 is a permanent magnet, 1
2 is a signal unit, 12a is a bobbin part, 12b,
17a is a mounting hole, 12c is a support part, 12d is a housing part, 12e is a positioning part, 12f is a cover part, 20 is a metal cover, 14, 15, 23 are connector terminals, 16 is a signal coil, 17 is an ignition unit, 17b is a mounting part, 18 is an output terminal, 19 is an input terminal, 21 is a tightening screw, 25 is a governor advance device, 26 is a governor base, 27 is a power distribution rotor, 2
7a opening, 32 is a cap. Note that the same reference numerals in the figures indicate the same parts.

Claims (1)

[Scope of utility model registration request] A heat dissipation housing supporting a rotating shaft, a positioning part A formed in the housing, and a positioning part B formed inside the housing to engage with the positioning part A. a signal unit that is held and generates an ignition signal by rotation of the rotating shaft, and is installed inside the housing opposite to the signal unit and is removably fitted to the signal unit and receives the ignition signal. An ignition unit that controls current flow to the ignition coil and generates an ignition voltage in the ignition coil, and a tightening screw that is integrally screwed into the housing when the ignition unit is fitted to the signal unit. engine ignition system.