JPS6325894Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an engine-driven generator, and in particular, an engine-driven generator in which the output shaft of the engine and the rotor shaft of the generator are coaxially connected via a flexible joint. Regarding machines.

BACKGROUND ART Conventionally, a flywheel has been fixed to the end of an output shaft of an engine used in an engine-driven generator of medium capacity or larger. This flywheel generally has a substantially U-shaped cross section with the outer circumferential portion protruding toward the generator, and the weight of the outer circumferential portion is set to be large. The shape of this flywheel improves the flywheel effect by increasing the weight of the outer periphery even if the overall weight is the same, and when used for a vehicle, part of the clutch element can be attached to the flywheel. This is because the entire device can be made smaller by storing it in the recess of the wheel. On the other hand, in an engine-driven generator, the engine output shaft and the generator rotor shaft are directly connected coaxially to achieve a reduction in size and weight.

However, during assembly, it is difficult to make the engine output shaft and the generator rotor shaft completely coaxial due to dimensional errors and misalignment of the installation position, especially when the generator rotor shaft is long. It is even more difficult.

In such cases, a laminated flexible joint is usually used to connect the parts so that smooth rotational movement can be achieved even if the two axes are slightly misaligned.

This type of flexible joint is fixed by fitting the outer peripheral part of the flexible joint to the spigot-processed part of the flywheel. In this case, one end of the generator rotor shaft is prefixed to the center of the flexible joint. 1st
The conventional example is shown in the figure. In Fig. 1, 1
indicates the generator, and 2 indicates the engine body. The stator frame 1A of the generator 1 is firmly fixed to the flywheel housing 3 of the engine body 2. Further, reference numeral 4 denotes a flywheel attached to the engine output shaft 5, and its outer peripheral portion protrudes toward the generator 1 side over the entire circumference and has a substantially U-shaped cross section.

The end surface of the protruding portion 4A of the flywheel 4 on the generator 1A side has a spigot processing portion 4B that is centered using a lathe or the like and provided at a predetermined position,
The outer periphery of the flexible joint 6 is fitted into the spigot-processed part 4B, and the centering accuracy of the spigot-processed part 4B and the outer periphery of the flexible joint 6 are used to coaxially connect the spigot-processed part 4B and the flexible joint 6. It has been concluded by.

In this case, the other end of the rotor shaft 7 of the generator 1 (right end in FIG. 1: not shown) is supported by a bearing or the like.
The end on the engine side is connected to and supported by the flywheel 4 of the engine via a laminated flexible joint 6 made up of several to ten or more thin steel plates. The following inconveniences occur.

The flexible joint 6 is made of laminated thin steel plates, and the centering process is difficult and has poor accuracy.

At the time of assembly, the flexible joint 6 must be inserted into the spigot processing part 4B, but when inserting the relatively heavy rotor shaft, a lot of effort and equipment are required to adjust the insertion position.

There is a high possibility that the flexible joint 6 will be fixed in a bent state due to the rotor's own weight, and therefore the shaft center will be difficult to come out and the rotational balance will not be achieved.

As described above, there are various problems with the conventional technology described above, and for this reason, the rotational balance of each device must be measured and readjusted after assembly, and this work requires a lot of skill and labor. There were some inconveniences such as the need for

Therefore, in view of the above circumstances, the present invention not only enables the work to be carried out efficiently in a short time without causing misalignment of the axes between the engine and the generator when connecting the engine and the generator, but also increases durability. The purpose of the present invention is to provide an engine-driven generator that can be used as an engine.

In order to achieve the above object, the present invention has a flywheel fixed to the output shaft of the engine, and the rotor shaft of the generator is coaxially connected to the flywheel via a flexible joint. In the engine-driven generator, the engagement stepped portion of the auxiliary plate is fitted into the step-like spigot processing portion of the flywheel, the peripheral edge of the donut-shaped flexible joint is fixed to the auxiliary plate, and the flexible joint is fixed to the auxiliary plate. The end of the rotor shaft of the generator is fitted into the donut hole, and the auxiliary plate and the rotor shaft of the generator are provided with a fitting part consisting of a concave part and a convex part that fit into each other. The engine-driven generator is characterized by interposing a ball bearing in each fitting part with the rotor shaft, which is positioned at the center of the donut hole of the flexible joint and can support the load in the tilting direction.

Embodiments of the engine-driven generator according to the present invention will be described below with reference to the drawings. First, a first embodiment will be described based on FIG. 2, in which the same parts as in FIG. 1 are given the same reference numerals.

In FIGS. 2 and 3, 1 represents a generator, 2 represents an engine body, and 4 represents the engine body 2.
The flywheel of the engine is attached to the end of the output shaft of the engine, and its peripheral end protrudes toward the generator 1 side over the entire circumference. The engaging stepped portion of the auxiliary plate 10, which is concentric with the engine output shaft, is fitted and fixed by the portion 4B. Further, this auxiliary plate 10 is also slightly protruded toward the generator 1 side over the entire circumference of its peripheral end, and this protruding portion 10A
Donut-shaped flexible joint 6 made by laminating thin plates on
is bolted together with the power generation cooling fan 13 at its peripheral end.

The rotor shaft 7 of the generator 1 is fitted into the dot hole of the flexible joint 6 and fixed with bolts. On the other hand, the end surface of the rotor shaft 7 has a ring-shaped groove, and a protrusion inward from the groove is used as a guide shaft 7A. The guide shaft 7A is tilted in a direction 7E of the guide shaft 7A as means for point contact and support.
It is supported at the fitting portion 10C of the auxiliary plate 10 via a ball bearing 11 capable of supporting a load of . The position where the guide shaft 7A is supported by the ball bearing 11 is the center 7B of the donut-shaped flexible joint 6.
The guide shaft 7A is set so that it can tilt around the center.

Note that the tip of the guide shaft 7A of the rotor shaft 7 is chamfered.

With this structure, the auxiliary plate 10 is fixed in advance to the flywheel 4 of the engine, and the stratum flexible joint 6 is fixed to the generator rotor shaft 7. As mentioned above, the rotor shaft 7 is attached to the fitting portion 10C provided on the auxiliary plate 10.
Insert the guide shaft 7A.

Since the guide shaft 7A is chamfered, it can be inserted into the inner ring of the ball bearing 11 very easily and is perfectly coaxial. After that, the bolts 10B and 10B are screwed together and fixed. Needless to say, the generator stator frame 1A and the engine body 2 are also fixed together with bolts.

As described above, the guide shaft 7A is supported by the fitting portion 10C of the auxiliary plate 10 via the ball bearing 11. This ball bearing 11 is not used as an original rotating bearing, but is used as a means to support a load in the tilting direction 7E through point contact, and when transmitting rotational force, the outer ring and inner ring of the ball bearing 11 are relatively always stopped.

The center of deflection in the flexible joint 6 is 7B.
, and its center does not move. On the other hand, the ball bearing 11 has an outer ring 11 as shown in FIG.
The center of the ball bearing 11 is composed of A, an inner ring 11B, and a ball 11C, and the grooves of the outer ring 11A and inner ring 11B that contact the ball 1C also have a predetermined curvature compared to the curvature of the ball 11C. It is possible to rotate somewhat in the direction of arrow 7E about 11D. From this, if the center 7B of deflection and the center 11D of the ball bearing 11 are aligned, the ball bearing 11, the guide shaft 7A, and the fitting portion 10C will not wear out.

FIG. 4 shows a modification of the first embodiment. In the modification shown in FIG. 4, a guide shaft 10D facing the generator 1 is provided in the center of the auxiliary plate 10, and a ball bearing 11 that supports the guide shaft 10D is fitted to the generator rotor shaft 7. It has a structure in which a recessed fitting part 7D is provided, and the structure is exactly the same as in the second embodiment shown in FIG. 2, except that the guide shaft and the fitting part are replaced, and the effect is also exactly the same. becomes.

In FIGS. 2 and 4, A indicates the direction of flow of cooling air.

As described above, according to the present invention, one end of the rotor shaft of the generator is supported by the output shaft of the engine, so the full load of the rotor shaft of the generator is not applied to the flexible joint, making assembly easier. Not only is it simplified and the flexible joint does not inadvertently deform, but the ball bearings do not wear out or rattle. Furthermore, by forming a step-shaped spigot-shaped part on the flywheel in advance and positioning it by simply fitting an auxiliary plate into the spigot-shaped part, centering and assembly of the flexible joint becomes easier, improving work efficiency. can be achieved.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a conventional example, FIG. 2 is a partial sectional view showing a first embodiment of the present invention, FIG. 3 is an enlarged sectional view of a ball bearing, and FIG.
It is a partial sectional view showing an example. 1... Generator, 2... Engine, 4... Flywheel, 5... Output shaft, 6... Flexible joint, 7...
...Rotor shaft, 10...Auxiliary plate, 11...Ball bearing.

Claims (1)

[Scope of utility model registration request] The flywheel is fixed to the output shaft of the engine,
In an engine-driven generator in which the rotor shaft of the generator is coaxially connected to the output shaft of the engine via a flexible joint to the flywheel, an engagement stage of an auxiliary plate is provided in a step-shaped spigot processing part of the flywheel. The periphery of the donut-shaped flexible joint is fixed to the auxiliary plate, and the end of the rotor shaft of the generator is fitted into the donut hole of the flexible joint to prevent the rotation of the auxiliary plate and the generator. A fitting part consisting of a concave part and a convex part that fit into each other is provided on the child shaft, and each fitting part between the auxiliary plate and the rotor shaft of the generator is provided with a fitting part located at the center of the donut hole of the flexible joint in the tilting direction. An engine-driven generator characterized by intervening ball bearings capable of supporting a load of .