JP2014105670A - Power generation body unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation body unit that can be easily mounted to an existing engine.SOLUTION: A power generation unit 100 detachably and attachably mounted to an engine 1 comprises: a rotor 110 connected to an output shaft 20 of the engine and rotationally driven; a stator 130 opposed to the rotor at an interval in a rotary shaft direction; a housing 140 holding the stator and mounted to a crankcase of the engine; and a bearing 141 having a first bearing ring fixed to the housing, a second bearing ring fixed to the rotor and a rolling element assembled between the first bearing ring and the second bearing ring, and rotatably supporting the rotor to the housing.

Description

  The present invention relates to a power generator unit that is attached to a general-purpose engine, and more particularly to an electric power unit that can be easily attached to an existing engine.

A power generator attached to a general-purpose engine is a device that has a stator fixed to a crankcase and a rotor fixed to a crankshaft, and generates power by being driven by the engine.
As such a power generation body, for example, Patent Document 1 discloses a stator core that is arranged to protrude from the crankshaft to the outer diameter side and is fixed to the engine at a distance between a pair of rotor yokes that are arranged at intervals in the axial direction. An axial gap type power generating body in which is arranged is described.

JP 2009-216041 A

The power generator as described above needs to accurately set the positional relationship between the stator fixed to the crankcase of the engine and the rotor fixed to the crankshaft. The stator, the rotor, and the housing for housing these need to be designed exclusively, and the versatility was poor.
On the other hand, there is a user's desire to attach a power generator to an existing general-purpose engine and use it for power generation.
An object of the present invention is to provide a power generation unit that can be easily attached to an existing engine.

The present invention solves the above-described problems by the following means.
The invention according to claim 1 is a power generation unit that is detachably attached to the engine, and is connected to an output shaft of the engine and is driven to rotate, and is spaced from the rotor in the direction of the rotation axis. A stator disposed oppositely, a housing for holding the stator and attached to a crankcase of the engine, a first race ring fixed to the housing, a second race ring fixed to the rotor, And a bearing having a rolling element incorporated between the first raceway ring and the second raceway ring and rotatably supporting the rotor with respect to the housing. It is a power generation unit.
According to this, since the relative arrangement of the rotor, the housing, and the stator is pre-positioned by the bearing provided in the housing before being attached to the engine, the centering of the rotor and the stator and the adjustment of the axial gap are considered. Without this, the power generation unit can be easily attached to the engine and used.

The invention according to claim 2 is provided with an adapter having a stud bolt attached to the crankcase of the engine and protruding toward the housing, the housing having an opening into which the stud bolt is inserted, and the stud The power generator unit according to claim 1, wherein the power generator unit is fixed to the adapter by fastening a nut to a bolt.
According to this, by preparing an appropriate adapter according to the type of the crankcase of the engine, it becomes possible to attach the power generation unit to many types of engines, and the versatility is further improved.

According to a third aspect of the present invention, the rotor is fixed to a rotor holding member that is attached to the output shaft of the engine, and a plurality of the housings can be connected along a rotational axis direction of the rotor, The rotor holding member has fitting means that can be fitted to another rotor holding member provided in the adjacent housing connected to transmit the driving force. It is an electric power generation unit of description.
According to this, power generation can be enhanced by connecting and using a plurality of power generating units as necessary.
Further, since the rotor holding member has a driving force transmission function, a plurality of power generation units can be driven without extending the output shaft of the engine.

  As described above, according to the present invention, a power generator unit that can be easily attached to an existing engine can be provided.

It is an external view which shows the state which attached the Example of the electric power generation unit to which this invention was applied to the engine. It is typical sectional drawing which cut and looked at the electric power generation unit of FIG. 1 by the plane containing a rotating shaft. FIG. 2 is a schematic cross-sectional view of a state in which two power generating units of FIG. 1 are connected, cut along a plane including a rotation axis.

  The present invention has solved the problem of providing a power generator unit that can be easily attached to an existing engine by providing a bearing that rotatably supports a rotor in a housing that is attached to a crankcase and holds a stator.

Hereinafter, examples of the power generation unit to which the present invention is applied will be described.
The power generation unit according to the embodiment generates power by being attached to and driven by a general-purpose engine.
FIG. 1 is an external view showing a state in which the power generation unit of the embodiment is attached to an engine.
The engine 1 is, for example, a 4-stroke single-cylinder gasoline general-purpose engine, and includes a crankcase 10, a crankshaft 20, and the like.
The crankcase 10 is a container-like member that accommodates the main part of the crankshaft 20, and is formed of, for example, an aluminum-based alloy.
The crankcase 10 is integrally formed with a cylinder into which a piston is inserted.
A cylinder head provided with an intake / exhaust port, an intake / exhaust valve, a valve drive system and a spark plug is attached to the cylinder, and a carburetor, an air cleaner, a muffler, and the like are further attached to the cylinder head.
A lid-like main bearing cover 11 is detachably provided at one end portion (end portion on the PTO side) in the axial direction of the crankshaft 20 of the crankcase 10.
Further, a flywheel, a blower fan, a recoil starter, and the like are provided at the end of the crankcase 10 opposite to the bearing cover 11.

The crankshaft 20 is an output shaft of the engine 1 connected to the piston through a connecting rod inside the crankcase 10.
One end portion of the crankshaft 20 is provided so as to protrude in a horizontal direction from a main bearing cover 11 provided on a side portion of the crankcase 10 and functions as an output shaft portion (PTO shaft portion) of the engine 1.

The power generation unit 100 is detachably attached to the side of the crankcase 10 on the side where the crankshaft 20 protrudes (the main bearing cover 11 side).
The power generation unit 100 is a so-called axial gap type power generation unit in which a rotor and a stator are arranged to face each other with a small gap in the axial direction.
FIG. 2 is a cross-sectional view of the power generation unit as viewed along a plane including the rotation axis.

  The power generation unit 100 includes a rotor 110, a rotor holding member 120, a stator 130, a housing 140, an adapter 150, a control unit 160 (see FIG. 1), and the like.

In the rotor 110, permanent magnets 112 are arranged in a predetermined pattern on both surfaces of a disk member 111 having an opening in the center.
The rotor 110 can also be formed by subjecting a disk member made of a magnetic material to a magnetizing process in a predetermined pattern.
The rotor holding member 120 is a member (adapter) that attaches the rotor 110 to the crankshaft 20 of the engine 1.
The rotor holding member 120 is formed in a substantially cylindrical shape, and the rotor 110 is fixed in a state of protruding from the central portion in the axial direction of the outer peripheral surface portion of the rotor holding member 120 to the outer diameter side.
The crankshaft 20 is inserted on the inner diameter side of the rotor holding member 120.
Between the inner peripheral surface of the rotor holding member 120 and the outer peripheral surface of the crankshaft 20, relative rotation restricting means such as a spline, a key, and a key groove are provided for transmitting a driving force.
Further, the end portions 121 and 122 on both sides in the axial direction of the rotor holding member 120 are, for example, dog clutch shapes used for driving force transmission between the adjacent power generation unit units 100 when connecting a plurality of power generation unit units 100 to each other. The fitting means is provided.

The stator 130 is disposed so as to face both surfaces of the rotor 110 with an interval of, for example, about 1 mm in the rotation axis direction.
The stator 130 is configured by arranging a plurality of coils configured by winding a winding around a stator core in the circumferential direction.

The housing 140 is a cylindrical container-like member that houses the rotor 110 and the stator 130 and to which the stator 130 is attached.
The stator 130 is fixed to end surfaces (inner surfaces) on both axial sides of the housing 140.
The housing 140 is fixed to the crankcase 10 (main bearing cover 11) of the engine 1 via the adapter 150.
An opening into which both ends of the crankshaft 20 and the rotor holding member 120 are inserted is formed at the center of the end surface of the housing 140.
A bearing 141 that rotatably supports the rotor holding member 120 is provided at the inner peripheral edge of the opening.

The bearings 141 are rolling bearings that are provided on both end surfaces of the housing 140 and support both end portions of the rotor holding member 120 in a rotatable manner.
The bearing 141 is, for example, a single row deep groove ball bearing, but is not limited to this, and other types of rolling bearings can also be used.
The inner ring of the bearing 141 is fixed to a step portion formed on the outer peripheral surface portion of the rotor holding member 120.
The outer ring of the bearing 141 is fixed to the inner peripheral edge of the central opening on the end surface of the housing 140.
A raceway surface is formed on each of the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, and rolling elements (steel balls) are incorporated between them.
The bearing 141 rotatably supports the rotor 110 and the rotor holding member 120 while positioning the positional relationship between the rotor 110 and the stator 130 in both the axial direction and the radial direction.

A through hole 142 into which the stud bolt 152 of the adapter 150 is inserted is formed on the outer peripheral side of the housing 140.
A plurality of through holes 142 are arranged in a distributed manner in the circumferential direction.

The adapter 150 serves as a base when the housing 140 is fixed to the crankcase 10 of the engine 1.
The adapter 150 includes a plate 151 and a stud bolt 152.
The plate 151 is, for example, a disk-like or flat plate-like member having an opening at the center, and is fixed to the main bearing cover 11 of the crankcase 10.
The plate 151 has an opening 151 a into which a screw 153 for fastening it to the screw hole 12 formed in the main bearing cover 11 is inserted.
The arrangement of the openings 151 a is appropriately set according to the model of the engine 1.

The stud bolt 152 protrudes from the region near the outer peripheral edge of the plate 151 toward the housing 140 and is attached.
The stud bolt 152 is inserted into the through hole 142 of the housing 140 and fastened with a nut 154 to fix the housing 140 to the plate 151.

  The control unit 160 includes an electric circuit that controls the power generation unit 100.

In addition, the power generation unit 100 of the embodiment can be used by connecting a plurality thereof in the axial direction as necessary.
FIG. 3 is a schematic cross-sectional view showing a state where two power generating units are connected.
As shown in FIG. 3, the stud bolt 152 of the adapter 150 is replaced with an extended one, inserted into the through-hole 142 of the housing 140 of each power generation unit 100 in order, and fastened with a nut 154. A plurality of power generator units 100 can be attached to the main body.
At this time, by extending the end 121 of the rotor holding member 120 of one power generating unit 100 and the end 122 of the rotor holding member 120 of the other power generating unit 100, the extension of the crankshaft 20 or the like can be performed. Even if not performed, the driving force can be transmitted to the power generating unit 100 on the side away from the crankcase 10.

According to the embodiment described above, the following effects can be obtained.
(1) Since the relative arrangement of the rotor 110, the housing 140, and the stator 130 is preliminarily positioned by the bearing 141 provided in the housing 140, the centering of the rotor 110 and the stator 130 and the adjustment of the axial gap should be considered. The power generation unit 100 can be easily attached to the engine 1 and used.
As a result, the power generation unit 100 can be provided as an optional product for an engine of an existing model that is already in production or on the market.
(2) By attaching the housing 140 to the crankcase 10 via the adapter 150 and preparing an appropriate adapter 150 according to the type of the crankcase 10 of the engine 1, the power generator unit 100 can be used for many types of engines. Can be attached, and versatility is further improved.
(3) The generated power can be enhanced by connecting and using a plurality of power generating units 100 as necessary.
Further, since the rotor holding member 120 has the end portions 121 and 122 having a function of transmitting a driving force, the plurality of power generating units 100 can be driven without extending the crankshaft 20 of the engine 1.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
For example, the shape, structure, material, manufacturing method, arrangement, and the like of each member constituting the power generation unit can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Engine 10 Crankcase 11 Main bearing cover 11 Screw hole 20 Crankshaft 100 Power generation unit 110 Rotor 111 Disk member 112 Permanent magnet 120 Rotor holding member 121,122 End part 130 Stator 140 Housing 141 Bearing 142 Through-hole 150 Adapter 151 Plate 151a Opening 152 Stud bolt 153 Screw 154 Nut 160 Control unit

Claims (3)

A power generator unit detachably attached to the engine,
A rotor connected to the output shaft of the engine and driven to rotate;
A stator disposed opposite to the rotor in the direction of the rotation axis with an interval therebetween;
A housing that holds the stator and is attached to a crankcase of the engine;
A first race ring fixed to the housing; a second race ring fixed to the rotor; and a rolling element incorporated between the first race ring and the second race ring. And a bearing that rotatably supports the rotor with respect to the housing. An adapter having a stud bolt attached to the crankcase of the engine and protruding toward the housing;
The power generation unit according to claim 1, wherein the housing has an opening into which the stud bolt is inserted, and is fixed to the adapter by fastening a nut to the stud bolt. The rotor is fixed to a rotor holding member attached to the output shaft of the engine,
A plurality of the housings can be connected along a rotation axis direction of the rotor,
The said rotor holding member has a fitting means which can be fitted with the other rotor holding member provided in the adjacent housing connected, and can transmit a driving force. The power generator unit described in 1.

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