JPH09331642A - Engine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent undersirable position deviation of a stator core, by fixing a loose fitting plate to a stepped part corresponding to the width which is generated when a bracket and the stator core are collectively assembled in a unified body. SOLUTION: A front bracket 21 has a sectional form of a rectangle wherein the four corners are cut out with the dimension of a×b where a>=b. The outer peripheral form of a stator core 31 is a rectangle wherein the four corners are cut out and the dimension is a×b where a>=b>c. The stator core 31 is constituted by laminating magnetic plates having hollow circular holes in the central parts. In this case, step difference parts (gaps 103) corresponding to the width (b-c)/2 in the upper part and the lower part are left. In order to fill the gaps, loose fitting plates are fitted and fixed in the step-difference parts between the front bracket 21 and the stator core 31. By the effect of the loose- fitting plates, foreign matter can be prevented from entering through gaps on account of wind generated by a fan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an improvement in an engine generator, and in particular, it has been improved in that a cover band is wound around the outer periphery of a stator core to hide a step portion due to a dimensional difference between the bracket and the stator core. In addition, the present invention relates to an engine generator in which an undesired displacement of the stator core is prevented and the outlet is attached.

[0002]

2. Description of the Related Art FIG. 13 is a diagram showing a relationship between a bracket and a stator core in a conventional case. Reference numeral 101 in the drawing is a bracket, which is formed in a disk shape as a whole and has ears having mounting holes at four corners.

Reference numeral 102 denotes a stator core, which is not shown in the drawing, but is formed by laminating magnetic plates having a hollow circular hole in the central portion as is well known. As is well known, a large number of slots around which the stator windings are wound are formed inside the hollow circular holes, and face the rotor poles when assembled as a generator. The outer shape of the stator core 102 is generally in the shape of a square with four corners cut and cut in order to improve the material yield when punching and cutting from one large magnetic plate. The four corners are engaged with the disc-shaped edge of the bracket 101 to integrally assemble the stator core and the bracket.

Therefore, as apparent from FIG. 13, four gaps 103 are provided between the circular edge of the bracket 101 and the stator core 102 at positions corresponding to the four sides of the stator core 102. it can.

Therefore, in the conventional case, the gap 103 is
To hide the stator core 102 (stacked in FIG.
3 has a thickness in the direction perpendicular to the paper surface of 3),
A cover band 104 (represented by the circular dotted line in FIG. 13) is wound to create a cylinder of the same size as the circular edge of bracket 101.

FIG. 14 is a view for explaining the engagement state between the bracket and the stator core in the conventional case. Reference numeral 101 in the drawing denotes a bracket, and 102 denotes a stator core (both of which show a quarter of the whole). Corners in stacked stator cores (actually 4
Corners are cut in an arc shape so as to engage with the edge of the disk of the bracket, so that the portion a of the stator core 102 shown in the drawing is engaged with the portion a ′ of the bracket 101 shown in the drawing. Then, the stator core 102 and the bracket 101 are integrally assembled.

FIG. 15 is a view for explaining the installation condition of the outlet in the conventional case. Reference numeral 101 'in the drawing is a rear bracket, 105 is a cover cleaner which is attached to the rear bracket 101', 1
Reference numeral 06 is an outlet for taking out the generator output, and 107 is a ground wiring.

In the case of FIG. 15, the outlet 106 covers the rear bracket 101 'and the cover cleaner 105.
Mounted on top. In this case, it goes without saying that wiring for electrically connecting the outlet 106 and the generator stator winding is provided, but a grounding wiring 107 is provided to ground the ground terminal of the outlet 106, and the outlet 106 is provided. Is grounded to the rear bracket 101 '.

FIG. 16 shows a conventional example in which an outlet is housed together with a switch of a generator, an outlet and the like and is attached to a control box having an operation panel. Also in the case of FIG. 16, a wiring for grounding is provided between the ground terminal of the outlet 106 in the control box 108 and the rear bracket 101 ′.

[0010]

In the conventional case described with reference to FIG. 13, the bracket 1 as described above is used.
01 is wound around the stator core 102 in order to hide the step between the stator core 102 and the stator core 102, it is difficult to automate the winding of the cover band 104 around the outer circumference of the stator core 102 in a cylindrical shape. . That is, the stator
As shown in FIG. 13, the core 102 has a so-called square columnar shape, and it is difficult to wind the core 102 in a cylindrical shape around the outer periphery thereof. Therefore, it is desirable to consider measures for this.

In the conventional case described with reference to FIG. 14, the portion a of the stator core 102 shown in the drawing is engaged with the portion a'of the bracket 101. But,
It is difficult for the part a and the part a'to be correctly positioned. That is, when the stator core 102 is engaged with the bracket 101, the stator core 102 may be displaced in the direction of the arrow z or z ′ in the drawing, and the stator core 102 may be engaged.
The lead wire between the stator winding wound around the slot of the core 102 and the external connection may undesirably sag or does not reach undesirably. Therefore,
It is desired to solve this point.

In the conventional case described with reference to FIGS. 15 and 16, the grounding wiring 107 is required, and the number of parts is increased and the number of man-hours for mounting is required, which may cause a cost increase. Therefore,
It is desired to solve this point.

An object of the present invention is to eliminate an undesired step due to a dimensional difference between the bracket and the stator core.

[0014]

The engine generator of the present invention comprises:
In the engine generator having a generator shaft coupled to the engine-side shaft protruding from the end surface of the engine, the rotor mounted on the shaft, and the stator facing the rotor, The bracket of the machine is formed into a substantially rectangular shape having dimensions axb with four corners cut, and the stator core constituting the stator has a hollow circular hole and has dimensions ax cut with four corners. c
The width (b-c) which is formed when magnetic plates formed into a substantially rectangular shape (where c <b) are laminated and is formed when the bracket and the stator core are integrally assembled.
A gap stop plate is attached to the step portion corresponding to / 2, or the bracket of the engine generator is formed into a substantially rectangular shape of size axb with four corners cut, and the stator is formed. The stator core has a hollow circular hole and is formed by laminating magnetic plates formed in a substantially rectangular shape having dimensions a × b with four corners cut to eliminate the above-mentioned undesired steps. I am trying.

In the engine generator as in the case of the present invention, a fan having blades of diameter D is provided in the bracket of the generator for both cooling the generator itself and cooling the engine. The diameter D of this Juan wing
So that the bracket 10 shown in FIG.
It is conceivable to eliminate the step by adjusting the inner surface shape of No. 1 to the outer peripheral shape of the stator core 102. However, if this is done, the air volume of the fan may decrease and the cooling effect may deteriorate. .

In the case of the present invention, the stator core 102 is designed to have a large outer peripheral shape so as to reduce or eliminate the step. And at that time, the wind created by Juan can be directed to the engine side.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before explaining the present invention, a schematic structure of a generator using a bracket mounting component structure of the present invention and an engine of its drive source will be described with reference to FIG. It will be described in advance with reference to FIG.

In FIGS. 1 and 2, reference numeral 21 designates an engine 20.
It is a front bracket that is mounted on the side of the engine 20. The shaft 23 of the rotor (rotor) 22 is fixed to the shaft 20-1 on the engine 20 side with through bolts 24 (see FIG. 1). The rotor core 25 has a shaft 2
3 is press-fitted, and a field winding 27 is wound around the rotor core 25 via a bobbin 26.

A fan 28 attached to a bobbin 26 is provided on the engine 23 side of the shaft 23, and a bearing 29 for freely rotating the rotor 22 is attached to the rear bracket 30 on the opposite shaft 23. Has been. A stator core 31 is provided between the rear bracket 30 and the front bracket 21, and a generator winding 32 is wound around the stator core 31.

A slip ring 33 is attached to the shaft 23 near the bearing 29, and a field current is supplied to the field winding 27 via the slip ring 33. This field current is automatically adjusted by the automatic voltage regulator 2, and the voltage generated in the power generation winding 32 is made constant.
This constant voltage is taken out from the outlet 34 fixed to the rear bracket 30. Reference numeral 35 is a rear cover.

The module of the automatic voltage regulator 2 which is miniaturized and has vibration resistance of electronic parts is attached to the rear bracket 30 of the generator shown in FIG. ing. That is, for example, a large and strong capacitor 5 is used as a fixed component on the substrate 4, and the electronic components such as the transistors 6 and 41 and the capacitors 42 to 44 having a high height are placed upright around the capacitor 5 which is regarded as a fixed component. Place it. With the large and strong capacitor 5 firmly fixed on the substrate 4, these high transistors 6 and 41 and the capacitors 42 to 44 are provided.
These electronic components are integrally fixed by a fixing member 45 such as a heat shrinkable tube or a resin fastener. With this structure, the board 4 is downsized and its vibration resistance is secured, and the module of the automatic voltage regulator 2 is downsized and vibration resistance is achieved.

When the module of the automatic voltage regulator 2, that is, the board 4 is attached and fixed to the rear bracket 30, the automatic voltage regulator 2 and the generator winding are connected to each other so as to have a separable connection structure. Is Faston tab 4
6 is provided and a coupler 47 having a female contactor that is electrically connected to the faston tab 46.
Are provided. Reference numeral 48 represents a coupler fixing portion.

FIG. 3 is a view for explaining the relationship between the front bracket and the stator core in the case of one embodiment of the present invention. Reference numeral 21 in the drawing is a front bracket,
Reference numeral 31 represents a stator core, and 103 represents a gap.
Further, a, b, and c in the drawing represent dimensions, respectively.

In the structure shown in FIG. 3, the front bracket 21 has a rectangular cross section as shown in the figure of size a × b (a ≧ b) with four corners cut. Further, the outer peripheral shape of the stator core 31 is a × c with four corners cut.
Is formed so as to form a rectangle (where a ≧ b> c).
Needless to say, the stator core 31 is formed by laminating magnetic plates having a hollow circular hole (not shown) in the center.

In the case of the structure shown in FIG. 3, a stepped portion (gap 1 corresponding to the width (b-c) / 2) in the upper and lower parts shown in FIG.
03) remains. FIG. 4 shows the structure of the gap stop plate.
The lower part of FIG. 4 is a front view of the gap stop plate that fills the gap 103 shown in FIG. 3, and the upper part of FIG. 4 is a view of the plate as viewed from above. In the figure, reference numeral 50 is a gap stop plate, 50-1 is an arcuate projection fitted into the arcuate clearance 103,
Reference numeral 50-2 represents a retaining projection that fits into a hole formed in the front bracket 21. The gap stop plate 50 is shown in FIG. 2 so as to be fitted to the step portion between the illustrated front bracket 21 and the stator core 31. This gap stop plate can prevent foreign matter from entering through the gap due to the wind from the fan 28.

FIG. 5 is a diagram corresponding to FIG. 3 and is a diagram for explaining the relationship between the size of the stator core, the size of the front bracket and the size of the fan. Reference numerals in the figure correspond to those in FIGS. 2 and 3.

In the structure shown in FIG. 5, when the diameter of the blade of the fan 28 is D, the relationship of c≤D <b≤a is satisfied. By doing so, a space corresponding to the dimension (b−D) minus the thickness t of the wall of the front bracket 21 is provided between the tip of the blade of the fan 28 and the inner wall of the front bracket 21. Occurs. This space is used for the engine 20 as shown in FIG.
Of the fan 28, the wind from the fan 28 cools the end surface of the engine 20 through the opening. FIG.
The right side view shown in FIG. 2 is a view of the front bracket 21 as seen from the end surface side of the engine. The opening is 4
It is composed of a plurality of windows as indicated by 9.

FIG. 6 shows another embodiment corresponding to FIG. In the case shown in FIG. 6, the outer shape of the stator core 31 has dimensions a × b. In this case, the diameter D of the blade of the fan 28 has a relationship of D <b ≦ a.

In the case of the present invention, FIG. 7 shows a shape in which a convex portion of the caulking portion is provided on the stator core and a shape in which a square hole is provided on the bracket side. In the figure, reference numeral 30 is a rear bracket, 31 is a stator core, 52 is a convex portion of a caulking portion, 5
Reference numeral 3 represents a square hole.

In the case of the configuration shown in FIG. 7, the stator core 3 is formed by fitting the caulking convex portion 52 with the back surface (that is, the concave portion) of the caulking convex portion of the adjacent stator core 31.
1 is fixed to each other and laminated on at least the outermost magnetic plate of the stator core 31, which is formed by the caulking convex portion 52.
To appear.

FIG. 8 is an enlarged view of the convex portion of the caulking portion. As shown in FIG. 8, a partially protruded caulking portion convex portion 52 is formed on the outermost magnetic plate of the stator core 31, and has a function of fixing the stator core 31 to each other.

On the other hand, on the side of the bracket (the rear bracket 30 is shown in FIG. 7, but the front bracket 21 may be used), a square hole 53 with which the caulking convex portion 52 is engaged is provided. deep.

In this way, when the stator core 31 and the bracket are assembled together, the caulking convex portion 5 is formed.
2 is engaged with the square hole 53 and then assembled. Therefore, as described with reference to FIG. 14 above,
Undesired misalignment between the stator core and the bracket is eliminated.

FIG. 9 shows another embodiment for preventing the displacement of the stator core. In the figure, reference numeral 30 is a rear bracket, 31 is a stator core, 54 is a radial protrusion on the stator core, and 55 is a rear bracket 3.
It represents the radial depression on the 0 side.

In the case of the configuration of FIG. 9 as well, the stator core 31
When the rear bracket 30 and the rear bracket 30 are integrally assembled, the protrusion 54 is fitted into the recess 55 to prevent the stator core 31 from being displaced. Needless to say, radial depressions are also provided on the front bracket 21 side.

FIG. 10 shows still another embodiment for preventing the displacement of the stator core. Reference numeral 30 in the figure is the rear
A bracket, 31 is a stator core, and 49 'is a brim.

The collar 49 'shown in FIG. 10 is provided on the side of the rear bracket 30 so as to project from the plane of the drawing toward the front. And the stator core 31
When assembled with the rear bracket 30, the two linear sides of the stator core 31 shown in FIG.
9'is touched. That is, the above-mentioned displacement of the stator core 31 is prevented. Of course, the brim may be provided on the front bracket 21 side.

The caulking convex portion 52 and the convex portion 54 described with reference to FIGS. 7 and 9 are provided outside the effective magnetic path where the stator core 31 is directly related to the electric performance of the generator. ing. Therefore, even if the caulking portion convex portion 52 and the convex portion 54 are provided, the electric performance of the generator is not adversely affected.

In FIG. 10 above, the collar 49 'is a rear
It is provided on the side of the bracket 30 and does not adversely affect the electric performance of the generator as in FIGS. 7 and 8.
FIG. 11 shows an embodiment in which an outlet is installed in the present invention. In the drawing, reference numeral 30 is a rear bracket, 34 is an outlet, 56 is a boss, and 57 is a screw. As shown in FIG. 12, the outlet 34 is of a type in which the ground terminal connected to the ground contact port also serves as the outlet fitting.

In the illustrated case, the boss 56 is set up on the rear bracket 30, and the outlet 34 is fixed by the screw 57.
Directly screwed to the rear bracket 30. Therefore, when the outlet 34 is fixed by the screw 57, the ground terminal of the outlet 34 is immediately electrically connected to the rear bracket 30 by the screw 57 as it is. That is, the ground contact port of the outlet 34 is grounded.

The place where the outlet 34 is grounded is
Rear bracket, front bracket, stator
It suffices if the outlet, such as the core and the outer case of the engine, is sufficient to ground the outlet 34. In either case, as shown in FIG.
As shown in FIG. 5, when fixing the outlet 34 with the screw 57, the grounding is performed as it is.

[0042]

As described above, according to the present invention, the cover band which has been conventionally provided can be eliminated, so that the cost of parts can be reduced. Moreover, at that time, the diameter of the blade of the fan is not reduced, and the foreign matter can be prevented from entering. Furthermore, the cooling air of the generator can be used as the cooling air of the engine. In addition, it is possible to prevent undesired displacement of the stator core, and to ensure the wiring process during assembly of the generator. Moreover, even when installing the outlet, the grounding wiring is not required and the grounding contact can be grounded.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of component mounting of a rear bracket of the present invention.

FIG. 2 is an overall schematic configuration diagram of an engine generator of the present invention.

FIG. 3 is a diagram illustrating a relationship between a front bracket and a stator core in the case of an embodiment of the present invention.

FIG. 4 shows a structure of a gap stop plate.

FIG. 5 is a diagram corresponding to FIG. 3 and is a diagram illustrating a relationship between dimensions of a stator core, dimensions of a front bracket, and dimensions of a fan.

FIG. 6 shows another embodiment corresponding to FIG.

FIG. 7 shows a shape of a stator core provided with a caulking portion convex portion in the case of the present invention.

FIG. 8 is an enlarged view of a caulking convex portion.

FIG. 9 illustrates another embodiment for preventing stator core misalignment.

FIG. 10 shows still another embodiment for preventing the stator core from being displaced.

FIG. 11 shows an embodiment for mounting an outlet in the present invention.

FIG. 12 shows the back of the outlet.

FIG. 13: Bracket and stator in the conventional case
It is a figure which shows the relationship with a core.

FIG. 14: Bracket and stator in the conventional case
It is a figure explaining the engagement state with a core.

FIG. 15 is a diagram illustrating a mounting state of an outlet in a conventional case.

FIG. 16 shows a conventional example in which an outlet is attached to a control box.

[Explanation of symbols]

 20: Engine 21: Front Bracket 20-1: Engine Side Shaft 22: Rotor (Rotor) 23: Shaft 28: Fan 30: Rear Bracket 31: Stator Core 34: Outlet 50: Clearance Plate 52: Caulking Projection 53: square hole 54: raised 55: recess 56: boss 57: screw

Claims (5)

[Claims] 1. An engine generator having a generator shaft connected to an engine-side shaft protruding from an end face of an engine, a rotor mounted on the shaft, and a stator facing the rotor. In, the dimension a in which the bracket of the engine generator was cut at the four corners
In addition to being formed into a substantially rectangular shape of xb, the stator core forming the stator has a substantially rectangular shape of axc (where c <b) with hollow circular holes and four corners cut. A gap stop plate is formed by stacking the formed magnetic plates and has a step portion corresponding to a width (b-c) / 2 generated when the bracket and the stator core are integrally assembled. An engine generator characterized by being installed. 2. A fan having blades having a diameter D (where c ≦ D <b) is mounted on the generator shaft between the rotor and the end surface of the engine, and the wind generated by the fan causes the wind to have the size a. The engine generator according to claim 1, wherein the engine generator is fed to the end face side of the engine in the generator shaft direction through a gap created by the difference between the diameter D and the diameter D. 3. An engine generator having a generator shaft coupled to a shaft on the engine side protruding from an end surface of the engine, having a rotor mounted on the shaft, and having a stator facing the rotor. In, the dimension a in which the bracket of the engine generator was cut at the four corners
A magnetic plate is formed in a substantially rectangular shape of xb, and the stator core forming the stator has a hollow circular hole and is cut into four corners to form a substantially rectangular magnetic plate of size axb. A fan having blades with a diameter D (where D <b) is mounted on the generator shaft between the rotor and the end surface of the engine, and the wind generated by the fan is An engine generator which is fed to the end face side of the engine in the generator shaft direction through a window provided in the bracket. 4. The protrusions or recesses are provided on at least the outermost magnetic plate of the laminated stator cores, and the protrusions or recesses provided on the magnetic plates are attached to the bracket side. When the stator core and the bracket are integrally assembled, the convex portion or the concave portion formed on the magnetic plate is formed on the concave portion or the convex portion formed on the bracket. The engine generator according to any one of claims (2) and (3), which is engaged. 5. A boss is formed on the bracket, and an outlet for the engine generator is attached to the boss, and a ground screw of the outlet is attached to the bracket by a fixing screw for attaching the outlet. Claims (1) to (4) are characterized in that they are directly grounded.
An engine generator according to any one of.