JPS5915239Y2 - internal combustion engine driven generator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an internal combustion engine-driven generator that is used by being attached to an internal combustion engine.

In a conventional internal combustion engine driven generator, as shown in FIG.
Fixed by

One end of the stator 6 is fitted into the pilot part 10 of an attachment 9 made of aluminum alloy or the like, which is attached to the crankcase 7 of the internal combustion engine with screws 8 or the like, and the other end is fitted with a rear cover 11 made of aluminum alloy or the like. Fixed.

The rear cover 11 has a bearing box 12 in the center, and a hole 13 is bored in the center of the bearing box 12. A spigot part 14 is formed in the hole 13 to accommodate a bearing 15, which prevents the rotor 1 from running out. is suppressed.

The stator 6 and the rear cover 11 are fixed to the attachment 9 with tightening screws 16.

In an internal combustion engine-driven generator with such a structure, the bearing 15 is pressure-fitted to the shaft 2 of the rotor 1 for convenience of assembly, but the bearing box 12 is difficult to assemble if it is pressure-fitted. Conventionally, a loose fit has been used because it requires a lot of man-hours.

Therefore, when the rotor 1 rotates, the outer ring 15a of the bearing 15
may rotate relative to the bearing box 12, and when the outer ring 15a rotates, the gap between the outer ring 15a and the bearing box 12 will wear out, and the gap will become even larger, making it easier to rotate, which will eventually cause play in the bearing 15, making operation impossible. There was a drawback.

In order to improve this, conventionally, as shown in Fig. 2, a steel ring 17 or the like is inserted into the spigot part 14 of the receiving box 12 so that the part in contact with the bearing 15 does not wear out even if there is some slippage. has also been proposed.

However, with this structure, the rear cover 11
It is difficult to form the bearing box 12 by aluminum die-casting, and the number of man-hours is increased.Also, in the processing of the bearing box 12, there is an aluminum part and a steel part, which makes it difficult to process, resulting in high costs.

The purpose of the present invention is to propose an internal combustion engine-driven generator in which the outer ring of the bearing can be fixed at a low cost without the above-mentioned drawbacks, and will be explained in detail below with reference to the embodiments shown in the drawings. .

FIG. 3 shows a first embodiment of the present invention.

As shown in the figure, in the internal combustion engine driven generator of this embodiment, the pilot part 14 provided in the hole 13 of the bearing box 12 is
The entrance side into which the bearing 15 is inserted is a clearance fit hole 14a, and the back side is a step hole with a smaller diameter pressure fit hole 14b.

The inner diameter of the pressure fit hole 14b is selected to be slightly smaller than the outer diameter of the bearing outer ring 15a so that the bearing outer ring 15a is press-fitted, and the inner diameter of the loose fit hole 14a is selected to be slightly smaller than the outer diameter of the bearing outer ring 15a. Bearing outer ring 15a is selected slightly larger than the outer diameter of a.
This allows for a loose fit.

In this way, when tightening the tightening screw 16, the bearing 15 is positioned concentrically with the pressure fit hole 14b by the clearance fit hole 14a of the spigot part 14 and guided. 14b can be easily press-fitted.

The bearing 15 press-fitted into the pilot part 14 has its outer ring 15
A is fitted across the pressure fit hole 14b and the clearance fit hole 14a.

FIG. 4 shows a second embodiment of the present invention.

In this embodiment, the clearance fit hole 14 a of the pilot part 14 is
is a tapered hole.

Even in this case, the same effects as in the first embodiment can be obtained.

FIG. 5 shows a third embodiment of the present invention.

In this embodiment, a screw hole 13 is formed by cutting a screw 18 into the hole 13 of the bearing box 12 excluding the pilot part 14.

In this way, the shaft 2 and bearing 15 can be pushed out from the spigot part 14 by screwing the male screw into the threaded hole 13' during disassembly, making disassembly easy.

As explained above, in the internal combustion engine-driven generator according to the present invention, the spigot part of the bearing box has a clearance fit hole on the inlet side into which the bearing is inserted, and a pressure fit hole on the back of the hole. Configure the bearing with a pressure fit hole 1 using a clearance fit hole.
Since it is positioned concentrically with respect to 4b and guided and press-fitted into the pressure-fit hole, assembly is easier than with a structure in which the entire part of the spigot is a pressure-fit hole.

The outer ring of the bearing can be fixed in the radial and thrust directions with the pressure fit hole, and further fixed in the radial direction with the clearance fit hole, so the bearing can be mounted firmly and the bearing rotation can be reliably prevented.

Furthermore, in the present invention, the bearing outer ring can be fixed simply by changing the size of the hole in a part of the spigot, so costs can be reduced compared to when conventional fixing means are used.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a conventional internal combustion engine driven generator, Fig. 2 is a sectional view of main parts showing another embodiment of a conventional generator of this type, and Figs. FIG. 3 is a cross-sectional view of essential parts showing three types of embodiments of such an internal combustion engine-driven generator. 1... Rotor, 2... Shaft, 3.
...Internal combustion engine crankshaft, 6...
Stator, 7...Internal combustion engine crankcase, 1
1... Rear cover, 12... Bearing box, 1
3... Hole, 14... Inro part, 14
a...: Clearance fit hole, 14b...Pressure hole, 15...Bearing, 15a...
Outer ring, 16... Tightening screw.

Claims (2)

[Scope of utility model registration request] (1) In an internal combustion engine-driven generator having a rotor and a stator, the rotor being rotationally driven by the rotational force of an internal combustion engine, a bearing housing a bearing that rotatably supports the shaft of the rotor. The box has a hole, and a part of the spigot for accommodating the bearing is formed in the hole, and the part of the spigot has a clearance fit hole at the entrance side for receiving the bearing, and a pressure fit hole at the back thereof. An internal combustion drive generator characterized by: (2) The internal combustion engine-driven generator according to claim 1, wherein a portion of the hole of the bearing box, excluding a portion of the pilot hole, is a punch hole.