JPH03527Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an electrically ignited in-line multi-cylinder engine, and the main body of the engine is shared with that of a diesel engine, thereby reducing manufacturing costs and reducing the overall cost of the engine. We provide something that can be compacted.

To explain in more detail the application field of the technology that is the premise of the present invention, for example, as shown in FIGS. 1 and 6 or 1 and 7, the cylinder block of an in-line multi-cylinder engine E. 1, a timing transmission case 3 is provided on the front 2, a pump housing 6 and a fuel supply feed pump 7 are provided on the front part 5 of the side surface 4,
A driving camshaft 8 of this feed pump 7 is supported in the pump housing 6 in the front-rear direction, and the camshaft 8 is connected to the timing transmission case 3 via an internal timing transmission 9 to the crankshaft 10 with a 1/2 reduction ratio. Interlock and connect with
The ignition timing setting device 16 for each spark plug 15 of the electric ignition device 14 of the engine E is vertically attached to the upper wall 11 of the pump housing 6.
The rotation detection shaft 12 is interlocked and connected to the camshaft 8.

<Background> Traditionally, two types of vertical engines have been manufactured: diesel engines and electric ignition engines, but if the main parts of these engines could be made common, it would be possible to share production lines and processing equipment, which would speed up the manufacturing process. Costs can be reduced.

<Prior Art> Therefore, for example, when a diesel engine body is used in an electric ignition type engine, the fuel injection pump and injection nozzle are replaced with an ignition plug or an electric ignition device. As shown in FIG. 7, the electric ignition device 14 interlocks the driving camshaft 8 of the feed pump 7 with the distributor 26 to generate a high voltage current in the booster circuit 21, and then connects the distributor 2 to the booster circuit 21.
6, the power is distributed to the spark plugs 15 of each cylinder.

In this case, as shown in Japanese Utility Model Publication No. 42-6081, the mechanism for attaching the distributor 26 to the engine is to interlock a rotation detection shaft in a direction perpendicular to the camshaft, and to connect a trigger circuit above the rotation shaft. There is one that incorporates an ignition timing setting device consisting of a distributor and utilizes the extra space above the pump housing.

<Problems to be Solved by the Invention> However, since the distributor located at the upper end of the rotation detection shaft sequentially distributes high-voltage current to the spark plugs of each cylinder, it detects the rotation of the same number of contacts as the number of cylinders. Because they are large and bulky in the diametrical direction, they must be placed around the shaft, and are therefore perpendicular to the rotation axis, so if they are placed close to the pump housing, the intake/exhaust pipes, etc., protrude from the engine body. To avoid interference with other parts, the rotating shaft must be raised high and installed in a space separated from the engine body, and the distributor protrudes greatly outside the side wall of the engine body, making the entire engine larger. I had a problem that turned into a problem.

<Means for solving the problems> The present invention is intended to solve the above problems.
In addition to lowering manufacturing costs by sharing the diesel engine body, we omitted the large and bulky distributor from the ignition timing setting device of the electric ignition system, and replaced it with trigger circuits for each cylinder. This was proposed with the aim of making the ignition timing setting device compact and the overall engine compact by arranging the trigger rotor in the trigger circuit in multiple stages above and below and positioning the trigger coil to face the trigger rotor. To achieve this purpose, it is structured as follows.

That is, the electric ignition device 14 has the same number of electric ignition circuits 17 as the number of cylinders of the engine E connected in parallel to the power source 18, and each electric ignition circuit 17 is connected to the trigger circuit 2.
0, a booster circuit 21, and a spark plug 15,
The ignition timing setting device 16 includes the rotating shaft 12, a casing 24 supporting the rotating shaft 12, and each trigger circuit 20.
, and a trigger rotor 23 for actuating the coil 22.The trigger rotors 23 are mounted on the rotating shaft 12 in multiple stages vertically and offset from each other in the axial direction, and the trigger coils 22 are arranged vertically relative to each other. Shift each trigger rotor 2
The trigger coil is attached to the casing 24 so as to be located opposite to the outer lateral surface 25 of the casing 24 and inside the outer lateral surface 25 of the casing 24. Using).

<Effects of the present invention> Therefore, to describe the effects of the present invention brought about by the above configuration, an ignition timing setting device consisting of a rotation detection shaft and a casing circuit supporting the shaft is provided above the pump housing, and the ignition timing setting device is provided above the pump housing. If you install the same number of booster circuits as the number of cylinders in the engine and connect them to the spark plugs, you will not need a mechanism to distribute the high voltage current generated by the booster circuit to each spark plug, that is, a distributor. I won't.

On the other hand, the trigger circuit is a compact component consisting of a small trigger rotor and a trigger coil that only allows a minute current to flow as a gate current to a diode etc. that controls the operation of the booster circuit.
The trigger rotors that make up the trigger circuit are mounted in multiple stages above and below the rotating shaft, and the trigger coils are arranged vertically and vertically in opposition to the trigger rotors, so that the trigger coils protrude greatly over the entire circumference in the radial direction of the rotating shaft. Therefore, the inner diameter of the casing that supports the rotating shaft can be kept small.

Furthermore, the position of the trigger rotor, which protrudes outward from a part of the circumferential direction of the casing, is recessed inwardly from the outer side surface of the casing to prevent the trigger rotor from protruding from the engine.

For this reason, while making use of the extra space above the pump housing, the distributor, which was traditionally the bulkiest, is omitted, and instead a long and narrow casing is placed close to the engine body, allowing the ignition timing to be adjusted. The device does not protrude outward from the side of the engine body and can be made compact, which in turn makes the entire engine more compact.
It can be smoothly integrated into a work machine without taking up much space.

Additionally, when using the main body of a diesel engine for each of the electrically ignited multi-cylinder engines, an ignition timing setting device is attached above the pump housing, and booster circuits for the number of cylinders are connected to this ignition timing setting device. For example, it is possible to easily form a predetermined electric ignition system while keeping the engine compact.
Electric ignition engines can be easily used in common with diesel engines to reduce manufacturing costs.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 is a left side view of an electric ignition three-cylinder engine, Figure 2 is a vertical side view of the area around the pump housing, Figure 3 is a cutaway front view of the main part, and Figure 4 is a cutaway cross section of the main part around the casing. In the figure, an electrically ignited multi-cylinder engine E has a cylinder head 30 and a head cover 31 above the cylinder block 1.
Assemble the gear case 3 to the front 2 of block 1.
In addition, a pump housing 6 is arranged at the front part 5 of the left side surface 4.

A fuel supply feed pump 7 is provided outside the left side of the pump housing 6, and the feed pump 7 is interlocked with a pump driving camshaft 8 that is longitudinally mounted within the housing.

This driving camshaft 8 is interlocked and connected to the crankshaft 10 at a reduction ratio of 1/2 via a gear transmission mechanism 9 housed inside the gear case 3, and through this gear transmission, the rotational force of the crankshaft is transmitted to the feed pump 7. and supplies fuel from the fuel tank to the carburetor.

Then, the ignition timing setting device 16 of each spark plug 15 of the electric ignition device 14 is vertically attached to the upper wall 11 of the pump housing 6, and the ignition timing setting device 16 is attached to the rotation detection shaft 12 and the casing 2 that supports it.
4. It is composed of a trigger coil 22 and a trigger rotor 23, and the rotating shaft 12 of the setting device is interlocked and connected to the camshaft 8.

That is, the rotation detection shaft 12 is positioned with respect to the camshaft 8 so that the axial directions thereof are orthogonal to each other, and the bevel gear 3 is
3, the casing 24 having a U-shaped cross section is thrust into the pump housing 6,
The rotating shaft 12 is covered with a bearing 34 interposed therebetween, and a disk-shaped trigger rotor 23 is attached to the rotating shaft portion protruding from the pump housing 6 so as to be rotatable at the same time.

Each trigger rotor 23 has a notch 36 cut out in one place of a disk 35.
A cylindrical body integrally formed with upper and lower three stages shifted in the axial direction is fixed to the rotating shaft 8, and the notches 36 of each stage are offset by about 120 degrees from each other.

Further, a coil case 37 is removably attached to one side of the casing 24 with a bolt 32, and three trigger coils 22 are fixed by shifting them up and down inside the coil case, and their tips are attached to the disk 3 of each trigger rotor.
5.

Then, the coil case 37 is recessed so that it is located inward from the outer side surface 25 of the casing 24, that is, the plane that includes the front end portion 40 of the casing 24 and is parallel to the side surface of the engine body. ,
The amount of protrusion from the engine body is kept to a minimum.

Incidentally, reference numeral 38 connects the trigger coil 22 to the rotor 23.
39 is a guide that supports the casing 24.

On the other hand, an electric ignition device 14 is constructed by connecting three electric ignition circuits 17 in parallel to a power source 18, and the electric ignition circuit 17 is constituted by a trigger circuit 20, a booster circuit 21, and a spark plug 15 (see FIG. 6). ).

The trigger circuit 20 is constructed by connecting a diode or the like to a trigger coil 22, and as described above, three trigger coils (that is, equal to the number of cylinders of the engine) are fixed in the coil case 37. , the ignition timing of the spark plug 15 is determined by the action of the trigger rotor 23.

Further, the boost circuit 21 functions to generate high voltage by the action of the primary coil and the secondary coil 44 and send a high voltage current to the ignition plug 15, and the ignition coil 45 incorporating this circuit is shown in FIG. As shown in
Three such spark plugs are provided in the surplus space surrounded by the upper end wall 41 of the cylinder block 1 and the horizontal side wall 43 of the cylinder head 30, and each of them is connected to the spark plug 15.

To describe the function of the electric ignition device 14 constructed in this way, the trigger rotor 2 is activated by the rotation of the rotation detection shaft 12.
3 rotates relative to the trigger coil 22,
When the notch 36 of the rotor crosses the trigger coil 22, a change in magnetic field is generated in the coil and the booster circuit 21 is activated.

Therefore, each spark plug 15 installed in each cylinder is operated by a booster circuit 2 that receives a command from an ignition timing setting device 16.
1 (that is, the ignition coil 45), a high-voltage current is supplied to the ignition coils and the ignition coils are sequentially ignited at predetermined timings.

As described above, in the present invention, the ignition timing setting device 16 of the electric ignition device 14 is connected to the pump housing 6.
It is characterized in that it is installed vertically on the upper wall, and the trigger rotor and the trigger coil facing it are arranged to be shifted up and down in the axial direction of the rotation detection shaft. Although the number may be the same as the number of cylinders, it is also possible to arrange a plurality of combinations of trigger rotors and coils in one stage.

For example, in the case of a four-cylinder engine, as shown in Figure 5, the trigger rotor is arranged in two stages with shifted positions of the notch, and two trigger coils are installed at 180 degrees opposite positions in each stage. There is no problem in regulating the ignition timing.

Further, since the mechanism of the trigger rotor and the coil only needs to cause magnetic field fluctuation in the coil due to the rotation of the rotor, instead of cutting out a notch in the tri-rotor, a protrusion that is based on the magnetic field fluctuation may be protruded.

Further, the interlocking mechanism between the feed pump driving camshaft 8 and the rotation detection shaft 12 may be helical gear interlocking, but if an interlocking mechanism using bevel gears is used as in the above embodiment, the rotating shaft can be brought closer to the engine body. This allows the engine to be made more compact.

It goes without saying that the present invention can be applied to any electrically ignited engine, regardless of whether it is a gasoline engine or a gas engine.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention. Figure 1 is a left side view of an electrically ignited three-cylinder engine, Figure 2 is a vertical side view of the pump housing and its surroundings, and Figure 3 is a view of the same. Fig. 4 is a cutaway front view of the main part, Fig. 4 is a cutaway cross-sectional view of the main part around the casing, Fig. 5 is a view equivalent to Fig. 4 showing another embodiment, Fig. 6 is a circuit diagram of the electric ignition device, Fig. 7 6 is a diagram corresponding to FIG. 6 showing a conventional example. 1... Cylinder block, 2... Front of 1, 3
...Time adjustment electric case, 4...side side of 1, 5...
4 front part, 6...pump housing, 7...fuel supply feed pump, 8...drive camshaft,
9... Timing transmission device, 10... Crankshaft, 11
... Upper wall of 6, 12 ... Rotation detection shaft, 14 ... Electric ignition device, 15 ... Each spark plug, 16 ... Ignition timing setting device, 17 ... Electric ignition circuit, 18 ... Power supply, 20 ... ...Trigger circuit, 21...Boost circuit, 2
2...Trigger coil, 23...Trigger rotor, 2
4... Casing, 25... Outer side surface of 24.

Claims (1)

[Scope of utility model registration request] A timing transmission case 3 is installed on the front side 2 of a cylinder block 1 of an in-line multi-cylinder engine E, and a front part 5 of a side surface 4 is installed.
A pump housing 6 and a feed pump 7 for fuel supply are provided in the pump housing 6, and a driving camshaft 8 of the feed pump 7 is supported in the front and back directions inside the pump housing 6. The ignition timing setting device 16 of each spark plug 15 of the electric ignition device 14 of the engine E is connected vertically to the upper wall 11 of the pump housing 6, and is connected to the crankshaft 10 through a transmission device 9 at a 1/2 reduction ratio. In an electrically ignited in-line multi-cylinder engine configured by interlocking the rotation detection shaft 12 of the ignition timing setting device 16 with the camshaft 8, the electrical ignition device 14 has the same number of electrical ignition circuits 17 as the number of cylinders in the engine E. are connected in parallel to the power supply 18, each electric ignition circuit 17 is composed of a trigger circuit 20, a booster circuit 21, and a spark plug 15, and the ignition timing setting device 16 is connected to the rotation shaft 12.
, a casing 24 that supports the casing 24 , each trigger coil 22 of each trigger circuit 20 , and a trigger rotor 23 that operates the coil 22 , and each trigger rotor 23 is arranged on the rotating shaft 12 in a vertically multi-stage manner, with the trigger rotors 23 being shifted in the axial direction of the rotating shaft 12 . The electric ignition is characterized in that the trigger coils 22 are vertically shifted relative to each other and are positioned facing each trigger rotor 23, and are attached to the casing 24 so as to be positioned inside the outer lateral surface 25 of the casing 24. Inline multi-cylinder engine