JPH09191610A - Engine driven generator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To obtain an engine-driven generator that is easy to assemble and that can improve generator efficiency. SOLUTION: A rear cover 4 is connected to a front cover fixed to an engine with bolts. The stator core 5 of the stator 6 is sandwiched between the front cover and the rear cover 4. The stator core 5 is provided with a bottomed mounting hole 27 that opens toward the side facing the rear cover 4, and the rear cover 4 has the mounting hole 2
7 is provided with a collar through hole 28. An anchor collar 29 made of an insulating material is inserted into the mounting holes 28 of the rear cover 4 and the bottomed mounting holes 27 of the stator core 5. The anchor collar 29 is provided with a collar 29a for pressing the rear cover 4 at the base, and the tip is divided into a plurality of split pieces 29b.
The anchor collar 29 is fixed to the stator core 5 by pressing the rear cover 4 with its collar 29a and pushing apart each split piece 29b with the screw 30 screwed into the guide hole of the shaft center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-driven generator that is attached to an engine and is rotationally driven by the engine to generate electricity.

[0002]

2. Description of the Related Art A conventional engine-driven generator of this type is
As shown in FIGS. 7 to 9A and 9B, a front cover 2 fixed to a not-shown engine with bolts 1 and a rear cover 4 connected to the front cover 2 with bolts 3.
An annular stator 6 in which a stator core 5 is sandwiched between the front cover 2 and the rear cover 4, a rotor 7 rotatably arranged in the stator core 5, and a stator core 5 on the outer periphery. The rotary shaft 10 is fixed and one end is rotatably supported by the bearing 8 on the rear cover 4, and the inlet of the engine output shaft fitting hole 9 is opened at the other end, and the rotary shaft 1 on the front cover 2 side.
It has a structure provided with cooling vanes 11 attached to the outer periphery of 0.

The front cover 2 and the rear cover 4 include
Outwardly projecting portions 12 and 13 are provided, and the bolt 3 inserted into the hole of the projecting portion 13 of the rear cover 4 is screwed into the screw hole of the projecting portion 12 of the front cover 2 to connect the front cover 2 and the rear cover 4 to each other. And the stator core 5 is tightened.

An output winding 14 is wound around each pole portion of the stator core 5 of the stator 6, and a power generation output is taken out from the output winding 14.

The rotor 7 has a structure in which a field winding 16 is wound around the pole portion of the rotor core 15.

The rotary shaft 10 is provided with a through hole 17 along its axis, and the base end of the through hole 17 serves as a tapered engine output shaft fitting hole 9. A bolt 18 is inserted into the through hole 17 from the tip side, and the bolt 18 is screwed to the engine output shaft so that the rotary shaft 10 is connected and fixed to the engine output shaft.

The front cover 2 and the rear cover 4 include
Ventilation openings 19 and 20 are provided respectively.

When assembling such an engine-driven generator to the engine, the front cover 2 is fixed to the engine with bolts 1, and then the tip of the engine output shaft is fitted into the engine output shaft fitting hole 9 of the rotary shaft 10. The rotor 7 is connected to the engine output shaft by fitting and fixing the rotating shaft 10 to the engine output shaft with the bolt 18. Next, rotor 7
A stator 6 is fitted to the outer periphery of the rear cover 4, and then a rear cover 4 is assembled, and the rear cover 4 and the front cover 2 are clamped with a stator core 5 and the rear cover 4 and the front cover 2 are fastened with bolts 3. .

By the way, the stator core 5 is shown in FIG.
As shown in (B), laminated plates 21 made of thin iron plates punched in an annular shape are laminated and the outer periphery is welded at a welded portion 22, or they are connected by caulking by a progressive laminating method.

Since such a stator core 5 is difficult to hold at the time of assembly, it is generally assembled to the engine after the rear cover 4 and the stator 6 are assembled.

Therefore, generally, a protrusion 23 is provided on the rear cover 4 at the position of the ventilation port 20, and a through hole 24 is provided in the stator core 5 corresponding to the through hole of the protrusion 23. A bolt 25 is inserted in the through hole 24 of the stator core 5.
The stator 6 is attached to the rear cover 4 by screwing the nut 26 into the bolt 25 that has passed through the stator core 5 and tightening it.

[0012]

However, the engine-driven generator having such a structure has the following problems.

(A) Since the stator core 5 is provided with the through holes 24, the magnetic path cross-sectional area of the iron plate 21 is reduced, which is an obstacle to downsizing the generator.

(B) Since the bolt 25 and the laminated plate 21 are in contact with each other, the welded portion 22 and the bolt 25 form a closed magnetic circuit,
An eddy current is generated in the stator core 5 due to the alternating magnetic field, and an increase in magnetic loss causes a decrease in efficiency.

(C) Since the stator core 5 constituted by the laminated body of the laminated plates 21 is sagging due to the stack thickness deviation, the contact portion between the stator core 5 and the bolt 25 changes due to the variation in the tightening work. However, the axial range of the closed magnetic circuit changes, causing variations in the generator performance, which makes the generator performance unstable.

(D) When an eddy current is generated, vibration is generated in the bolt 25 due to magnetic stress and hits the stator core 5,
Noise is generated.

(E) At the time of assembly, the bolt 25 and the nut 2
Since work from the rear cover 4 side and the front cover 2 side is required for tightening 6, the workability is poor.

It is an object of the present invention to provide an engine-driven generator which is easy to assemble and can improve the efficiency of the generator.

[0019]

SUMMARY OF THE INVENTION The present invention is directed to a front cover fixed to an engine, a rear cover connected to the front cover with a bolt, and an annular fixing in which a stator core is sandwiched between the front cover and the rear cover. (EN) An engine-driven generator including a child and a rotor rotatably arranged in a stator core and rotationally driven by rotation of an engine output shaft.

In the engine-driven generator according to the present invention, the stator core is provided with a bottomed mounting hole which is opened on the side facing the rear cover, and the rear cover is provided with a collar through hole facing the mounting hole. An anchor collar made of insulating material that is provided and has a brim that presses the rear cover at the base and the tip is divided into multiple split pieces is inserted into the mounting hole of the stator core through the collar through hole of the rear cover, and the anchor collar is It is characterized in that each split piece is spread and fixed to the stator core by a screw screwed into a guide hole of the shaft center while the rear cover is being pressed by the collar.

As described above, when the stator core is fixed to the rear cover with the anchor collar made of an insulating material and the screws that spread the respective split pieces of the anchor collar, it is necessary to provide a through hole over the entire length of the stator core. Instead, it is only necessary to provide a bottomed mounting hole with a minimum required length, which can improve the reduction of the magnetic path and downsize the generator.

Further, since the anchor collar made of the insulating material is used, the closed magnetic circuit cannot be formed, the eddy current due to the alternating magnetic field does not flow, the generator efficiency is improved, and the instability of the generator performance due to work is improved. It

Further, since no eddy current flows, no magnetic stress is generated, abnormal noise is eliminated, and noise is reduced.

Further, when fixing the stator core to the rear cover, only the work from the rear cover side is required, and the workability is improved.

In this case, it is preferable that the mounting hole of the rear cover is provided in a protrusion provided in the ventilation port of the rear cover.

With this arrangement, when the rear cover is provided with the projection and the mounting hole is provided in the projection, the bottomed mounting hole provided in the stator core can be selected as a position that does not interfere with the stator core. In addition, it is easy to design the mounting hole for the rear cover.

Further, a guide hole for guiding the screw from the base end side to the base end of the split piece without engaging with the screw is provided at the axial center of the anchor collar, and at the place of the split piece, the guide hole is provided along the longitudinal direction of the screw. It is preferable to continuously provide small-diameter guide holes.

When the guide holes having different inner diameters are provided at the shaft center of the anchor collar in this way, the screw is inserted into the guide hole on the inlet side without resistance, and then the screw is screwed into the guide hole having a diameter smaller than this screw. By doing so, each split piece can be easily pushed out and the anchor collar can be fixed to the bottomed mounting hole of the stator core.

[0029]

1 to 6 show an example of an embodiment of an engine-driven generator according to the present invention. The parts corresponding to those in FIGS. 7 to 9A and 9B described above are denoted by the same reference numerals.

In the engine-driven generator of this example, the stator core 5 is provided with a bottomed mounting hole 27 that opens toward the side facing the rear cover 4. A collar through hole 28 is provided in the protrusion 23 provided on the rear cover 4 so as to project from the ventilation hole 20 of the rear cover 4 so as to face the mounting hole 27.

An anchor collar 29 made of an insulating material such as resin is inserted into the collar through hole 28 and the mounting hole 27. The anchor collar 29 is provided with a collar 29a for pressing the rear cover 4 at the base, the tip is divided into a plurality of split pieces 29b by slits 29c, and a countersunk screw 30 is provided in the axial center from the base end side to the base end of the split piece 29b. The split piece 2 is provided with a guide hole 29d having an inner diameter that can be guided without being engaged.
A guide hole 29e having a diameter smaller than that of the flat head screw 30 is continuously provided at the position of 9b along the longitudinal direction thereof.
The entrance of d has a structure in which a tapered recess 29f is provided. Such an anchor collar 29 has a collar 29
While the rear cover 4 is held down by a, the split pieces 29b are spread by the flat head screws 30 screwed into the axial center of the rear cover 4 and fixed in the bottomed mounting holes 27 of the stator core 5. That is,
The countersunk screw 30 is inserted into the guide hole 29d on the base end side of the anchor collar 29 without resistance, and is inserted into the guide hole 29e having a diameter smaller than that of the countersunk screw 30 at the tip of the counterscrew 30 in a meshed state. 29b is expanded and the anchor collar 29 is fixed to the bottomed mounting hole 27 of the stator core 5. The countersunk part 30a of the countersunk screw 30 is housed in the tapered recess 29f of the anchor collar 29.

Other configurations are shown in FIGS. 7 to 9A and 9B.
Is similar to

In this way, the anchor collar 29 made of insulating material
When the stator core 5 is fixed to the rear cover 4 with the flat plate screw 30 that spreads each split piece 29b of the anchor collar 29, it is not necessary to provide a through hole in the stator core 5 over the entire length, and the minimum necessary It suffices to provide a bottomed mounting hole 27 having a length of 1. Therefore, the number of magnetic paths can be reduced and the generator can be downsized.

Further, since the anchor collar 29 made of an insulating material is used, the closed magnetic circuit cannot be formed, the eddy current due to the alternating magnetic field does not flow, the generator efficiency is improved, and the instability of the generator performance due to work is improved. To be done.

Further, since no eddy current flows, no magnetic stress is generated, abnormal noise is eliminated, and noise is reduced.

Further, when fixing the stator core 5 to the rear cover 4, only work from the rear cover 4 side is required, and workability is improved.

In this case, the mounting hole 27 of the rear cover 4
Is a projection 23 projecting in the ventilation port 20 of the rear cover 4.
, The bottomed mounting hole 27 provided in the stator core 5
Can be selected as a position that does not interfere with the stator core 5, and it is easy to design the mounting hole 27 of the rear cover 4 in accordance with this.

A guide hole 29d is provided in the axial center of the anchor collar 29 for guiding the flat head screw 30 from the base end side to the base end of the split piece 29b without being engaged with the split collar 29b. If a guide hole 29e having a diameter smaller than that of the flat head screw 30 is continuously provided along the
The countersunk screw 30 is inserted into 9d without resistance, and then the countersunk screw 30 is screwed into the guide hole 29e having a diameter smaller than that of the countersunk screw 30 so that each split piece 29b can be easily spread and expanded. The anchor collar 29 can be fixed to the bottomed mounting hole 27.

[0039]

In the engine-driven generator according to the present invention, since the stator core is fixed to the rear cover by the anchor collar made of an insulating material and the screw that spreads each split piece of the anchor collar, the fixing is performed. It is not necessary to provide a through-hole over the entire length of the child iron core, and it suffices to provide a bottomed mounting hole with a minimum required length. Therefore, the reduction of the magnetic path can be improved,
The generator can be miniaturized.

Further, since the anchor collar made of the insulating material is used, the closed magnetic circuit cannot be formed, the eddy current due to the alternating magnetic field does not flow, the generator efficiency can be improved, and the instability of the generator performance due to work is improved. be able to.

Further, since no eddy current flows, no magnetic stress is generated, abnormal noise is eliminated, and noise can be reduced.

Further, when fixing the stator core to the rear cover, only the work from the rear cover side is required, and the workability is improved.

In particular, when the mounting holes of the rear cover are provided on the protrusions projecting into the ventilation holes of the rear cover, the positions of the bottomed mounting holes provided on the stator core can be selected as positions that do not interfere with the stator core. There is an advantage in that it is easy to design the mounting hole of the rear cover in accordance with this.

A guide hole for guiding the screw from the base end side to the base end of the split piece without engaging the screw is provided at the axial center of the anchor collar, and at the place of the split piece along the longitudinal direction of the screw. If a small-diameter guide hole is provided continuously, the screw can be easily inserted into the guide hole on the inlet side without resistance, and then the screw can be screwed into the guide hole having a smaller diameter than the screw in a meshed state. The anchor collar can be fixed to the bottomed mounting hole of the stator core by pushing out each split piece.

[Brief description of the drawings]

FIG. 1 is a rear view showing an example of an embodiment of an engine-driven generator according to the present invention.

FIG. 2 is a partially longitudinal side view of the engine-driven generator shown in FIG.

3A and 3B are a front view and a side view of a stator core used in this example.

4A and 4B are a front view and a side view of an anchor collar used in this example, and FIG. 4C is a side view of a flat head screw used in this example.

FIG. 5 is a perspective view of essential parts showing a process of connecting the rear cover and the stator core in the engine-driven generator of this example.

FIG. 6 is a partially longitudinal side view of a connecting portion between a rear cover and a stator core in the engine-driven generator of this example.

FIG. 7 is a rear view of a conventional engine-driven generator.

FIG. 8 is a partially longitudinal side view of a conventional engine-driven generator.

9A and 9B are a front view and a side view of a stator core used in a conventional engine-driven generator.

[Explanation of symbols]

 1 Bolt 2 Front Cover 3 Bolt 4 Rear Cover 5 Stator Iron Core 6 Stator 7 Rotor 8 Bearing 9 Engine Output Shaft Fitting Hole 10 Rotating Shaft 11 Cooling Blades 12, 13 Convex 14 Output Winding 15 Rotor Iron Core 16 Field Winding wire 17 Through hole 18 Bolt 19,20 Vent 21 Laminated plate 22 Welded portion 23 Protrusion 24 Through hole 25 Bolt 26 Nut 27 Bottom mounting hole 28 Collar through hole 29 Anchor collar 29a Collar 29b Split piece 29c Slit 29d, 29e Guide hole 29f Tapered recess 30 Countersunk screw 30a Counter

Claims (3)

[Claims] 1. A front cover fixed to an engine, a rear cover connected to the front cover with a bolt, an annular stator having a stator core sandwiched between the front cover and the rear cover, and the stator. An engine-driven generator including a rotor rotatably arranged in an iron core and driven to rotate by rotation of an engine output shaft, wherein the stator iron core has an open bottom on a side facing the rear cover. An anchor made of an insulating material, in which a mounting hole is provided, a collar through hole is provided in the rear cover so as to face the mounting hole, and a brim for pressing the rear cover is provided at a base portion and a tip is divided into a plurality of split pieces. The collar is inserted into the mounting hole of the stator core through the collar through hole of the rear cover, and the anchor collar presses the rear cover with its collar. Engine generator, wherein the at its axis of guide threaded to screw into a hole in the state being spread each split piece is fixed to the stator core. 2. The engine-driven generator according to claim 1, wherein the mounting hole of the rear cover is provided on a protrusion projecting in a ventilation port of the rear cover. 3. A guide hole for guiding the screw from the base end side to the base end of the split piece without being meshed with the shaft center of the anchor collar, and at the location of the split piece along the longitudinal direction thereof. The engine-driven generator according to claim 1 or 2, wherein a guide hole having a diameter smaller than that of the screw is continuously provided.