JP2511868Y2 - Engine generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an engine generator, particularly an engine having a structure in which an outer field magnet type generator and a starter motor for starting the engine are built in a flywheel. It concerns generators.

[Conventional technology]

An engine generator having a magnet generator built in a conventional flywheel generally has a structure shown in FIG. That is, the flywheel 2 is fixed to the shaft 1 of the engine with bolts 3. The flywheel 2
As shown in the figure, the outer shape is formed in a bowl shape, and a plurality of magnets 4 are attached to the inner circumference of the bowl-shaped tip portion 2-1. Inside the bowl-shaped flywheel 2, a stator 5 is fixed to a boss 6 on the engine side with screws 7.
Since the generator winding 8 for the generator is wound around the outer periphery of the stator 5, the magnet 4 attached to the inner circumference of the bowl-shaped tip 2-1 is rotated when the engine shaft 1 rotates. Rotating along the outer peripheral surface of, the voltage is induced in the power generation winding 8.

By the way, when starting the engine, the bowl-shaped tip 2
-1 and a ring gear 9 provided on the outer periphery of the starter motor
The pinion gear 11 of 10 is engaged with the pinion gear 11 by jumping in, and a drive force is applied from the starter motor 10 to rotate the shaft 1 of the engine. When the shaft 1 of the engine reaches a predetermined number of revolutions or more, the gear between the ring gear 9 and the pinion gear 11 is disengaged by a device (not shown),
The engine is started.

[Problems to be solved by the device]

In the structure of the engine generator in which the outer field magnet type generator is built in the conventional flywheel as shown in FIG. 3, the flywheel 2 is designed to have a large inertia because of its original function. Since the diameter of the stator 5 is large, the outer diameter of the stator 5 is inevitably large for a generator that uses the flywheel 2 as a yoke, and the magnetically unnecessary portion below 2R is very large. There was a drawback. For example, when the outer diameter of the stator 5 is 260 mm, the inner diameter 2R = 190
The inner part of mm or less is a magnetically unnecessary part, so the yield was about 10 to 15%, which was not an effective use of the material.

Since the engine is started by the ring gear 9 provided on the bowl-shaped tip 2-1 of the flywheel 2, the magnet 4 bonded to the inner circumference of the bowl-shaped tip 2-1 is It may come off due to the impact of the pinion gear 11 jumping in,
It also had the drawback of cracking.

In addition, since the starter motor 10 has to be installed, it has been a major obstacle to downsizing the entire system and reducing costs.

The present invention aims to solve the above-mentioned drawbacks, and a starter motor unit that can also be used as a second generator is provided between the generators inside the starter which is magnetically unnecessary as a generator. It is an object of the present invention to provide an engine generator with a high yield of materials, a reduced number of parts, a reduction in size and weight of the entire system, and cost reduction by adopting a structure in which desired magnetic field interference is provided. .

[Means for solving the problem]

In order to achieve the above object, an engine generator of the present invention comprises a bowl-shaped flywheel fixed to an engine shaft and rotatably supported, and has a plurality of magnets inside the flywheel. In an engine generator having an outer field generator inside the flywheel, a rotor that is fixed to an engine shaft and rotatably supported by an armature winding for a starter motor. A generator winding for the generator facing the magnet provided on the flywheel is wound on the outer circumference, and a starter corresponding to the armature winding for the starter motor wound on the rotor is wound on the inner circumference. And a cylindrical stator formed by winding a field winding for a motor.

〔Example〕

FIG. 1 is a vertical sectional view of a generator portion of an engine generator according to the present invention, and FIG. 2 is a partial sectional view taken along the line AA of FIG.

In FIGS. 1 and 2, reference numerals 1 to 4, 6 to 8
Corresponds to the one in Fig. 3, 12 is a stator, 13 and 14 are slots, 15 is an armature winding, 16 is a field winding, 17 is a commutator, 18 is a brush, 19 is a brush holder, and 20 Is the rotor core, 21
Is a slot, 22 is a holder, 23 is a fan, 24 is a screw, and 2-2 is a window.

Inside the flywheel 2, a stator 12 is fixed by screws 7 to a boss 6 on the engine side. As shown in FIG. 1 and FIG. 2, the stator 12 has slots 13 and 14 on its outer circumference and inner circumference, respectively, and the power generation winding 8 for the generator is wound around the slot 13 and the starter is inserted into the slot 14. A field winding 16 for the motor is wound. Field winding for starter motor
A magnetic pole for the rotor core 20 is formed between the slots 14 around which 16 are wound. A slot 21 is provided on the outer circumference of the rotor core 20, and an armature winding 15 for a starter motor is wound around the slot 21. The rotor core 20 is fixed to the engine shaft 1 via a holder 22.

For example, the magnet 4 has 24 poles, the slot 13 of the stator 12 has an outer groove magnetic field type generator in which a three-phase power generation winding 8 having 36 grooves is wound, a starter motor has four poles, and a rotor core 20.
The DC motor having the slots 21 of 25 grooves is built in the flywheel 2.

A cooling fan 23 is attached to the outside of the flywheel 2 via a screw 24, and a structure for cooling the heat generating portion via the window 2-2 is used.

As is apparent from FIG. 2, the core of the stator 12 is punched out and the core of the rotor core 20 is punched out at the same time. Therefore, effective use of materials is promoted and yield is improved.

Further, in assembling and manufacturing the engine generator, the rotor core 20 for the starter motor is press-fitted into the flywheel 2 after being put in an assembled state in which winding, connection, varnish treatment, assembling of the commutator 17 and the like are performed. Also stator 12
After directly winding the generator winding 8 for the generator and the field winding 16 for the starter motor, they are fixed to the boss 6 on the engine side.

The engine generator of the present invention assembled in this way is
The shaft 1 of the engine is rotated by passing a current through the armature winding 15 and the field winding 16 for the starter motor using the battery. That is, the engine is started. When the engine speed reaches the predetermined speed, the power supply from the battery is stopped by a device (not shown). After that, the engine becomes normal rotation. At this time, since the starter motor at the time of starting the engine can be used as a DC generator, it can be used as a generator for charging a battery or the like.

When considering such use as a charging generator, a field winding 16 and an armature are provided for a generator having a magnet 4 and a generator winding 8 (referred to as a first generator). It is desired that the starter with winding 15 (designated the second generator) not undesirably (or reduce) magnetic interference.

In the present invention, the field winding 16 of the second generator is arranged on the side of the stator 12 so that the second generator is of the armature rotating type. For this reason, the magnetic flux used in the second generator is transferred from the N pole generated by the field winding 16 to the second magnetic flux.
Flows through the rotor core 20 of the generator of FIG. 2 through the S-pole generated by the field winding 16 and the arc-shaped route of about 90 ° on the stator 12.

From this, the flow of the magnetic flux used for the second generator is completed within approximately the inner half of the stator 12, and the magnetic flux generated by the direct current is the main, and the flow of the first generator is Undesired interference with the side is suppressed (even if the magnetic flux is generated by the armature reaction, it does not affect the side of the first generator).

[Effect of device]

As described above, according to the present invention, since the starter motor is built in the hollow portion of the flywheel, the entire system can be reduced in size and weight, and the material yield can be improved. Cost reduction is also possible. Since the field winding of the starter is provided inside the stator, undesired magnetic interference between the two rotating electric machines is suppressed. Furthermore, since there is no impact due to the jump in of the starter motor, the magnet does not come off or crack.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a generator portion of an engine generator according to the present invention, FIG. 2 is a partial sectional view taken along the line AA of FIG. 1, and FIG. 3 is a generator of a conventional engine generator. The longitudinal cross-sectional view of a part is shown. In the figure, 1 is the shaft, 2 is the flywheel, 2-1 is the tip, 4
Is a magnet, 5 is a stator, 8 is a power generation winding, 9 is a ring gear, 10 is a starter motor, 11 is a pinion gear, 12 is a stator, 15 is an armature winding, 16 is a field winding, 17 is a commutator, 18 is a brush, 20 is a rotor core, 22 is a holder, and 23 is a fan.

Claims (1)

(57) [Scope of utility model registration request] Claim: What is claimed is: 1. A bowl-shaped flywheel fixed to a shaft of an engine and rotatably supported. In an engine generator with a built-in machine, a rotor around which an armature winding for a starter motor that is rotatably supported by being fixed to the shaft of the engine is wound, and the above-mentioned flywheel provided on the outer periphery of the rotor. The generator winding facing the magnet is wound, and the field winding for the starter motor corresponding to the armature winding for the starter wound on the rotor is wound around the inner circumference. An engine generator, comprising: