JPS582139Y2 - Engine generator with rotor shaft extractor - Google Patents

Description

[Detailed description of the invention] In this invention, in an engine generator, the rotor shaft of the generator is tapered fitted to the output shaft of the engine and fixed with fixing bolts, thereby transmitting engine power to the rotor. Concerning what has been done.

This type of engine generator had the following problems when disassembling the engine and generator.

That is, the tapered fitting portions of the rotor shaft and the output shaft of the engine are in close contact with each other, making it impossible to disassemble both shafts simply by removing the center bolt that fixes the rotor shaft.

For this reason, both shafts were disassembled by hitting the tip end of the rotor shaft with a hammer, etc., but this method could accidentally hit the bearings, slip rings, or rotor body installed around the end of the rotor shaft. and transform them,
There was some damage.

In order to eliminate such problems, a dedicated puller may be provided.

However, the rotor and the cooling fan are usually integrally fixed to the rotor shaft, and the rotor shaft itself is relatively long.

For this reason, the puller inevitably has to be large and expensive, making it difficult to add it as a maintenance tool to the engine generator.

This idea eliminates the above-mentioned problems and allows the rotor shaft and engine output shaft to be reliably and easily disassembled, and also includes a rotor shaft extractor that can be used to remove the rotor shaft from the generator. The purpose is to make it possible to obtain it at a lower price by using a component that can be used for both purposes, and to always equip the engine generator with it.

For this reason, this idea uses, for example, a bolt for connecting the case that holds the stator of the generator, and with this bolt inserted into the center bolt insertion hole of the rotor shaft, the tip of the bolt is attached to the output shaft of the engine. At the same time, the rotor shaft is screwed into a screw hole formed in the above-mentioned insertion hole, and the rotor shaft is extracted from the engine output shaft by screwing the bolt.

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a front view of the engine generator, and FIG. 2 is a sectional view of the first conventional part.

In the figure, an engine generator 1 has a pair of left and right set bases 3 and 4 fixed between the bottoms of a pair of square frame-shaped front and rear frames 2, and an engine 5 and a generator 6 mounted on each set base 3 and 4. are fixed respectively.

The generator 6 has an outer shell formed by a stator 7 and a front case 8 and an end case 9 placed on both sides of the stator 7, and houses a rotor 10 therein.

The above-mentioned front case 8 also serves as a gear chamber cover for the engine 5 and is fixed to the crankcase 5a.

11 is a rotor shaft that supports the rotor 10, and one end of this is connected from the front case 8 to the generator 6 as shown in FIG.
It faces inward and is directly connected to an output shaft 12 which also serves as a crankshaft, and the other end is supported by the end case 9 via a bearing 13.

Further, the rotor shaft 11 has a tapered fitting portion 1 with respect to the output shaft 12.
The output shaft 1
It is fixed at 2.

A screw hole 16 having a larger diameter than the center bolt insertion hole 11a of the rotor shaft 11 is formed at the bolt insertion start end side of the center bolt insertion hole 11a of the rotor shaft 11.

Reference numeral 17 denotes a screw hole into which the center bolt 15 formed on the output shaft 12 is screwed.

The front case 8 and the end case 9 are connected to each other at four locations around the periphery by screw fixing devices 18 consisting of bolts 18a and nuts 18b.

Of this fixture 18, an integral bolt 18A is formed into a special shape so as to serve as a tool for extracting the rotor shaft 11.

In other words, the diameter of the shaft 18A is such that it can be inserted into the center bolt insertion hole 11a, and the length under its neck is the length from the tip of the rotor shaft 11 in the installed state to the back end of the screw hole 17 of the output shaft 12. Set to be greater than M.

Further, a threaded portion 19 having an appropriate length is formed near the bolt head to be screwed into the aforementioned screw hole 16, and the tip 20 side thereof is set to be smaller than the pilot hole diameter of the screw hole 17 of the output shaft 12. .

The bolts 18A formed as described above are normally electrically installed as a component of the generator 6 as shown in FIG. used as.

That is, when disassembling the generator 6, the screw fixing device 18 is removed, the end case 9 and the stator 7 are disassembled, and then the center bolt 15 is removed.

Thereafter, the bolt 18A is inserted into the center bolt insertion hole 11a of the rotor shaft 11 as shown in FIG. The screw part 19 near the head is inserted into the insertion hole 1
It is screwed into the screw hole 16 formed in 1a.

When the bolt 18A is rotated in the spiral direction in this state, the rotor shaft 12 is pulled toward the bolt head side while the bolt 18A remains in the same position.

Therefore, the rotor shaft 11 is pulled out from the output shaft 12, and both shafts 1
The 1° 12 taper fitting portion 14 is disengaged.

In addition to the above-mentioned embodiment, the tip 20 of the bolt 18A may have a large diameter and be brought into contact with the opening periphery of the screw hole 15 of the output shaft 12. In other words, the tip of the bolt 18A may have a large diameter. Any material that comes into contact with the shaft 12 may be used.

Further, the screw hole 16 may be provided closer to the output shaft 12 side, as shown in FIG.

In this case, the threaded portion 19 of the bolt 18A is provided closer to the tip 20.

As explained above, this invention utilizes the bolts that make up the generator, and provides them with a threaded part that screws into the threaded hole provided in the center bolt insertion hole of the rotor shaft.
When this threaded part is screwed into the above-mentioned screw hole, the bolt tip comes into contact with the output shaft, and the rotor shaft, which is tightly fitted to the output shaft via the tapered fitting part, is connected to the output shaft. It can be removed reliably with a simple operation of simply threading the bolt, making disassembly work easier.

Although the above-mentioned bolt is itself a component of the generator, it also serves as a removal tool for the rotor shaft, so the price can be reduced compared to the case where the removal tool is provided as a special item. It can be equipped with the item attached and can be used instantly whenever and wherever needed.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; Fig. 1 is a front view of the engine generator, Fig. 2 is a sectional view of the first intermediary section, Fig. 3 is an explanatory diagram of the operation, and Fig. 4 shows a modified example. This is a diagram equivalent to Figure 3. 5... Engine, 6... Generator, 8.
...Front case, 9 ... End case, 10 ... Rotor, 11 ... Rotor shaft, 11a ... Center bolt insertion hole, 12・・・
...Output shaft, 14... Taper fitting part, 1
5...Center bolt, 16...Screw hole, 18A...Bolt, 19...Threaded part, 20...Tip of 18A.

Claims (1)

[Claims for Utility Model Registration] 11 The rotor shaft 11 of the heavy electric machine 6 is
a center bolt 1 that is directly connected to the rotor shaft 12 via the tapered fitting portion 14, and that passes through the rotor shaft 11 and is threadedly engaged with the output shaft 12;
5, in order to fix the rotor shaft 11 to the output shaft 12 and insert the center bolt 15, a center bolt insertion hole 11a is provided in series along the axial direction of the rotor shaft 11, and this center bolt insertion hole 11a A screw hole 16 is formed in at least a part of the generator 6, and a screw portion 19 that is screwed into the screw hole 16 is formed on the port T-18A that connects and fixes the front case 8 and the end case 9 of the generator 6. The underneck length of the bolt 18A is set so that the vicinity of the tip 20 of the bolt 18A comes into contact with the output shaft 12 when this threaded part and the screw hole 16 are screwed together, and when the threaded part and the screw hole 16 are screwed together, the length under the neck of the bolt 18A is set. Bolt 18A
An engine generator 2 equipped with a rotor shaft extractor characterized in that the tightening/loosening operation part of the bolt 18A faces the outside of the center bolt insertion hole 11a, and the bolt 18A also serves as the rotor shaft extractor 11, registered as a utility model. An engine generator equipped with a rotor shaft extraction tool according to claim 1, in which a screw hole 16 is formed at the bolt insertion starting end of the center bolt insertion hole 11a.