JPS6126623Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a combustion type starting assist device for a diesel engine, and in particular to an improvement in ignition means for maintaining preheating combustion.

Generally, direct injection diesel engines use a combustion-type starting assist device called a burner in order to start smoothly in cold weather. As is well known, this starting aid device is provided with a fuel injection nozzle and an ignition means in the intake manifold that sends air to the cylinder, and when starting the engine, preheating fuel is injected from this nozzle, and the fuel is sent to the ignition means. The fuel is then ignited to burn the fuel, heating the air taken into the cylinder, and this heating allows the engine to start smoothly.

Conventionally, there is a method using a spark plug as an ignition means in this case. In the method using a spark plug, an electric contact means is connected to the drive shaft of the starter or engine, and the electric contact means is turned on and off in conjunction with the engine starting operation, and high voltage is generated by turning on and off the contact. The configuration is such that the primary current of the generating coil is intermittent, the intermittent generation generates a high voltage from the secondary coil, and this high voltage is supplied to the spark plug to ignite the preheating fuel and maintain its combustion. It's normal.

However, in the past, the starter and the electrical contact means had to be connected, and the electrical contact means was mechanically operated on and off, resulting in low durability, and in order to improve reliability, expensive contact means had to be used. However, it has the disadvantage of high cost. For this reason, it is conceivable to use a semiconductor switch element as the disconnection means, but this method also has the disadvantage of high cost.

The purpose of this invention is to provide a combustion type starting aid that is inexpensive, durable, and reliable.

This idea focuses on the fact that this type of starting aid requires high voltage only when starting the engine, and provides an auxiliary brush on the commutator of the starter motor. The intermittent circuit is configured to intermittent the primary current of the high voltage generating coil.
This is configured to generate high voltage from the secondary coil.

An embodiment of this invention will be described below in detail with reference to the drawings.

An embodiment of this invention is shown in FIGS. 1 to 3. In the figure, 111 indicates a commutator of the starter motor. This commutator 111 is composed of an insulating cylindrical body 113 attached to a drive shaft 112 of a starter motor (not particularly shown), and a plurality of commutator pieces 114 attached at equal intervals around this insulating cylindrical body 113. Ru. 115 and 116 are this commutator piece 1
14 shows a brush for the motor that slides into contact with the motor.

In this invention, auxiliary brushes 118 and 119 are provided on the commutator 111 of such a starter motor, and the auxiliary brushes 11 are
8 and 119 intermittently. In this example, an auxiliary commutator piece 117 is provided, and the auxiliary commutator piece 117 allows the auxiliary brush 11 to
8 and 119, and this disconnection causes an intermittent current to flow through the primary coil 212 of the high voltage generating coil 211 as shown in FIG. 2, and this intermittent current causes a high voltage to be generated in the secondary coil 213. A case is shown in which this high voltage is configured to be supplied to the spark plug 214 constituting the preheating fuel ignition means.

In this example, the auxiliary commutator piece 117 is attached to the circumferential surface of the insulating cylindrical body 113 over half the circumference as shown in FIG. This shows the case where it is configured to be intermittent.

With this configuration, the starter switch 215 shown in FIG. 2 is turned on, and the battery 2
By supplying power to the starter motor 217 from the starter motor 16, the starter motor 217 starts rotating. This rotation causes the auxiliary brush 118-11 to
9 is interrupted by the auxiliary commutator piece 117, an intermittent current flows through the primary coil 212 of the high voltage generating coil 211, and a high voltage is generated in the secondary coil 213.
This high voltage is supplied to the spark plug 214, and the preheating fuel is ignited. In addition, auxiliary brush 118-11
By connecting the capacitor 218 between the auxiliary brushes 118 and 119, the rise and extinguishment of the spark discharge become sharper, a higher voltage can be obtained, and the auxiliary brushes 118 and 119 can be protected.

In the above description, the case where the auxiliary commutator piece 117 is provided independently of the commutator piece 114 of the motor has been explained, but as shown in FIG.
, and an auxiliary brush 118 is attached to the extended part.
The primary current of the high voltage generating coil 211 may be caused to flow from the auxiliary brush 118 to the commutator 116 of the motor through the armature coil of the motor. The electric circuit in this case is as shown in FIG. Furthermore, even if the primary current of the high voltage generating coil 211 is passed through the armature coil of the motor in this way, the value of the primary current is sufficiently small compared to the driving current of the motor, so there is no risk of any adverse effect on the motor. do not have.

Further, as shown in FIG. 6, auxiliary brushes 118 and 119 may be provided between brushes 115 and 116 of the motor so as to be in sliding contact with commutator piece 114 of the motor. The electric circuit in this case is as shown in FIG.

As explained above, according to this invention, the high voltage generating coil 21 is
Since the configuration is configured to intermittent the primary current of 1,
The structure is simple and cost reduction can be expected. However, motor commutators are highly durable because they have a large current capacity to handle large currents. However, since the starter motor only rotates when starting the engine, its operating time is short. Therefore, wear of the auxiliary brushes 118 and 119 can be reduced, and a highly reliable starting auxiliary device can be constructed. Therefore, this effect is extremely large in practical use.

As another example, a delay relay is provided, and current is supplied directly from the battery 216 to the primary coil 212 of the high voltage generating coil 211 through the contacts of this delay relay, and when the starter switch 215 is turned on, the delay relay is configured to If configured to turn on the contact by energizing the relay, the relay contact will remain on for a certain period of time even after the starter switch 215 is turned off, and during this time the starter motor will rotate due to inertia, so the starter will not start. High pressure can be generated for a period of time after switch 215 is turned off. Therefore, with this configuration, starting performance can be improved.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an embodiment of the main part of this invention, Figure 2 is a connection diagram showing the electrical connection structure of this invention, Figure 3 is a side view of Figure 1, and Figure 4 is this invention. FIG. 5 is a connection diagram showing the electrical connection structure thereof, FIG. 6 is a perspective view showing still another embodiment of the invention, and FIG. 7 is the same as FIG. 6. FIG. 2 is a connection diagram showing the electrical connection structure of the embodiment. 111: Starter motor commutator, 112: Starter motor drive shaft, 113: Insulating cylindrical body, 1
14: Commutator piece, 115, 116: Motor brush, 117: Auxiliary commutator piece, 118, 119: Auxiliary brush, 211: High voltage generation coil, 212: Primary coil, 213: Secondary coil, 214: Spark plug.

Claims (1)

[Scope of utility model registration request] In a combustion-type starting auxiliary device in which a spark plug is attached to the intake pipe and activated when the starter is driven, igniting the preheating fuel and increasing the intake air temperature, an auxiliary brush is attached to the starter commutator. An ignition device for a combustion-type starting auxiliary device, comprising: a primary current of a high-pressure generator being intermittent by the auxiliary brush to generate a high voltage, and the high voltage being supplied to the ignition plug.