JPH09215292A - Power-generating device also serving for starting in two-cycle internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the enlargement of a two-cycle internal combustion engine and at the same time prevent a reversal brought about immediately before stopping it by a second closed circuit formed of a starting coil through a closed second contact, a brush in contact and a commutator. SOLUTION: Immediately before an internal combustion engine is stopped, when a starter button is in an off-state and the NC contact of a starter relay is closed, a brush is in contact with respectively a predetermined large-diameter conductive path 121, a commutator piece 122 and a small-diameter conductive path 123 and a second closed circuit 2 is closed. Namely, a closed circuit is formed of a starting coil 133 through contact with a brush, a commutator piece or the like, and the rotation of an inner rotor 90 generates electromotive force in the starting coil 133, so that the starting coil 133 acts as a power generation coil. Therefore, a current flows into the second closed circuit and for that reason, braking torque is applied to the inner rotor 90 by magnetic friction. Accordingly, the reversal of a crank shaft 83 brought about immediately before a two-cycle internal combustion engine is stopped can be prevented by the braking torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter / generator that integrally combines a two-cycle internal combustion engine starter and a generator.

[0002]

2. Description of the Related Art As a conventional starter / generator for an internal combustion engine, there is an example described in Japanese Utility Model Laid-Open No. 3-91064.
The device according to the same example is a starter / generator in which a starter coil and a generator coil are wound around a stator core of the same armature, a field pole is rotating outside the stator core, and a brush and a commutator are radially inward of the stator core. It has a structure in which a current converter composed of a child and an electromagnetic coil for moving the brush are arranged.

While the starter switch is turned on, a current flows from the battery to the starting coil through the current converter and acts as an electric motor to start the internal combustion engine.
In the off state of the starter switch, a closed circuit is formed by the generator coil and the battery, and the field pole rotates to act as a generator to charge the battery. When working as a generator, the starting coil is rarely used.

In a two-cycle internal combustion engine, there is a possibility that reverse rotation will occur immediately before the rotation of the crank rotating portion becomes small. Therefore, conventionally, the inertia moment of the crank rotating portion is increased to prevent the reverse rotation. It was

[0005]

However, if the structure is such that the required moment of inertia is added, the performance of the internal combustion engine becomes a load, and the apparatus itself becomes large and heavy. The present invention has been made in view of the above points, and an object of the present invention is to achieve a two-cycle internal combustion engine by using a starting coil that is not used except during starting without increasing the size and weight of the two-cycle internal combustion engine. The point is to provide a starter / generator that prevents reverse rotation immediately before the engine is stopped.

[0006]

In order to achieve the above object, the present invention comprises a starting coil separately from a generator coil, and power is supplied to the starting coil through contact between a brush and a commutator. In a start-up / generator of a two-cycle internal combustion engine, the brush and the commutator are brought into contact with and separated from each other on the basis of a predetermined rotation speed lower than an idle rotation speed of the two-cycle internal combustion engine, and the brush and the commutator are contacted at a predetermined rotation speed or less. Then, a brush contact / separation mechanism that disengages when a predetermined number of rotations is exceeded, a switch mechanism that closes the first contact and opens the second contact when the starter switch is turned on, the closed first contact and the brush that contacts A first closed circuit formed by connecting a battery and the starting coil through a commutator, a closed second contact, the brush that is in contact with the closed coil, and the starting coil alone through the commutator It is set to start and power generators in a second closed circuit and two-cycle internal combustion engine having a.

When the starter switch is turned on in a state where the two-cycle internal combustion engine is stopped and the brush and the commutator are in contact with each other, the first contact is closed and the first closed circuit is formed so that the power of the battery is reduced. It is supplied to the starting coil through contact between the brush and the commutator, and rotational torque is generated in the rotor to rotate the crankshaft and start the internal combustion engine.

In a state where the brush and the commutator are in contact with each other immediately before the two-cycle internal combustion engine is stopped, the second contact is closed to form a second closed circuit including only the starting coil, and the rotation of the rotor causes the starting coil to rotate. An electromotive force is generated in the electric current and a current flows, and braking torque due to magnetic friction acts on the rotor to prevent the crankshaft from rotating in the reverse direction. It is not necessary to add an inertia moment to the rotor to prevent reverse rotation, and it is possible to avoid an increase in size and weight of the device. When the engine is rotating normally beyond the predetermined number of rotations, the starting coil does not become a load.

The starting and generating device for a two-cycle internal combustion engine according to claim 1, wherein the brush contacting / separating mechanism comprises a centrifugal automatic speed control device, whereby a predetermined mechanical rotation of the two-cycle internal combustion engine is achieved. The brush and the commutator can be contacted and separated based on the number.

2. The two-cycle internal combustion engine according to claim 1, wherein the switch mechanism is a relay device that uses the first contact and the second contact as relay contacts and opens and closes the relay contacts by operating the starter switch. The starter / generator of the engine can be a simple switch mechanism that is driven by using the electric power of the battery.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment according to the present invention will be described below with reference to FIGS. The starter / generator 1 according to the present embodiment is provided in a two-cycle internal combustion engine mounted on a motorcycle, and its side sectional views are shown in FIGS. 1 and 2 for each state.

A vehicle starter / generator 80 is a crankcase.
The inner rotor 90 is provided on the side of 82, and the rotor boss 91 of the inner rotor 90 is fitted to the end portion of the crankshaft 83 and is tightened by the nut 84 to rotate integrally with the crankshaft 83.

The inner rotor 90 is shown in FIGS. The rotor boss 91 fitted to the end of the crankshaft 83 has six magnets 92 fitted on its outer circumference.
The rotor cover 93 is covered. A cylindrical portion 91d is formed so as to project from one side surface of the rotor boss 91, and a pin 91e is projectingly provided at a predetermined position on the cylindrical portion 91d.

A flat cylindrical governor outer 94 is fixed to the rotor boss 91 at the outer periphery of the cylindrical portion 91d of the rotor boss 91 by means of rivets 95 at the inner opening edge. The governor outer 94 has a shallow groove 94a axially oriented on the inner peripheral surface.
6 are formed at equal intervals in the circumferential direction, and the 6 grooves are formed.
Corresponding to each of the 94a, a claw portion 94b that is bent and extends toward the central axis is formed at the outer opening edge.

On the other hand, in the cylindrical portion 91d of the rotor boss 91,
The governor inner 96, which has a substantially bottomed cylindrical shape, is allowed to slide in the axial direction from the outside, and is integrally fitted for rotation. As shown in FIGS. 6 to 8, the governor inner 96 has a circular bottom 96.
On the outer circumference of a cylindrical portion 96b surrounding a, pockets 96c are formed so as to open outward at six places at equal intervals.
The bottom wall 96d of c is obliquely tapered.

On the outer circumference of the cylindrical portion 96b, a boss portion 96f having a screw hole 96e formed at a symmetrical position is formed to project, and the brush holder 100 is pierced by the screw 97 in contact with the circular bottom portion 96a. It is screwed and fixed integrally. Metal balls 98 are respectively housed in six pockets 96c on the outer periphery of the governor inner 96, and the cylindrical portion 96b becomes a rotor boss.
At the same time as it is slidably fitted into the cylindrical portion 91d of 91, the pocket 96c is fitted together with the ball 98 inside the governor outer 94, and the bent claw of the governor outer 94 as shown in FIG. 1 and FIG. Portion 94b is pocket 96
cover some of the opening in c and place ball 98 in the bottom wall of pocket 96c.
It is located between 96d.

A notch 91g is provided in a part of the cylindrical portion 91d of the governor inner 96, and a pin 91e protruding from the cylindrical portion 91d of the rotor boss 91 is fitted to the notch 91g, so that the governor is attached to the rotor boss 91. The inner 96 is prohibited from relative rotation and is allowed to slide only in the axial direction.

A spring 99 is provided between the inner bottom of the cylindrical portion 91d of the rotor boss 91 and the circular bottom 96a of the governor inner 96.
The governor inner for the rotor boss 91
96 is urged outward with the brush holder 100,
Therefore, the ball 98 is sandwiched between the diagonally bent claw portion 94b of the governor outer 94 and the tapered bottom wall 96d of the pocket 96c. In addition, between the inner peripheral surface of the governor outer 94 and the outer peripheral surface of the cylindrical portion 96b of the governor inner 96, there is a ball.
There is a margin so that the 98 can move to some extent in the radial direction.

Therefore, when the rotational speed of the inner rotor 90 increases, the governor inner 96 in the state shown in FIG.
The ball 98 is guided by the diagonally bent claw portion 94b of the governor outer 94 to move in the centrifugal direction by the centrifugal force, and the tapered bottom wall of the pocket 96c of the governor inner 96 is guided.
By pressing 96d, the governor inner 96 is slid inward in the axial direction against the spring 99 together with the brush holder 100 as shown in FIG.

Next, as shown in FIGS. 9 to 11, the brush holder 100 has an outer shape in which a flat cylindrical portion 100b surrounds a circular bottom portion 100a, and the inside of the cylindrical portion 100b is concentrically formed with a large-diameter concave portion 10a.
1a, a medium-diameter recess 101b, and a small-diameter recess 101c are formed by being partitioned by an inner wall 100c. Also, along the outer peripheral surface and the inner peripheral surface of the small-diameter concave portion 101c, an annular large-diameter gap close to approximately one round is formed.
102a and a small diameter gap 102b are formed in the circular bottom portion 100a.
Further, a pair of circular holes 103 through which a screw 97 that is coupled with the governor inner 96 penetrates is formed at a predetermined symmetrical position of the large-diameter recess 101a.

Large annular gap of the brush holder 100
As shown in FIG. 12, a minus side terminal plate 105, which is partially missing and is formed in an annular shape, is fitted into the 102a from the side of the circular bottom portion 100a. Similarly, in the small diameter gap 102b, as shown in FIG. + Side terminal plate 10 with the same shape but smaller diameter
6 is inserted. Each terminal plate 105, 106 is
Protrusions 105a and 106a are formed at predetermined three places, respectively, and are directed to the opposite side with respect to the circular bottom portion 100a.

A conductor 11 made of oxygen-free copper extending from one negative brush 110a arranged at a predetermined position of the large-diameter recess 101a.
1a is one protrusion 10 of the negative terminal plate 105.
Of the three negative brushes 110b, 110c, 110d, which are connected to the 5a and are arranged at three predetermined positions of the medium-diameter concave portion 101b, two adjacent negative brushes 110b, 110c are connected to each other by a conductor wire 111b. , One of the negative-side brushes 110c further extends from the lead wire 111c and the remaining one of the negative-side brushes 110d extends from the lead wire 111d and is connected to the other two protrusions 105a and 105a of the minus-side terminal plate 105. It

Therefore, one-side brush 110a disposed in the large-diameter recess 101a and three-side brushes 110a disposed in the medium-diameter recess 101b.
The side brushes 110b, 110c, and 110d are electrically connected to each other through the minus side terminal plate 105.

Further, the conductive wire 113a extending from one + side brush 112a arranged at a predetermined position of the small diameter recess 101c is the +
Of the three + side brushes 112b, 112c, 112d, which are connected to one protrusion 106a of the side terminal plate 106 and are arranged at predetermined three places in the medium diameter recess 101b, two adjacent + side brushes
112b and 112c are connected to each other by a conductive wire 113b, and a conductive wire 113c extending further from one + side brush 112c and a conductive wire 113d extending from the remaining one + side brush 112d are connected to the + side terminal plate 106. Two protrusions 106a, 10 of
Connected to 6a.

Therefore, one + side brush 112a provided in the small diameter recess 101c and three + side brushes 112a provided in the medium diameter recess 101b.
The side brushes 112b, 112c, 112d are electrically connected to each other via the + side terminal plate 106. It should be noted that each brush is biased outward by a spring 115 interposed in the recess as in the above-described embodiment, and is prevented from coming off the recess by a stopper 116.

In the commutator holder 120 corresponding to the brush holder 100, as shown in FIGS. 14 to 16, a disk portion 120a is surrounded by a cylindrical portion 120b having a diameter larger than that of the brush holder 100. , The large-diameter recess of the brush holder 100 on the surface of the disk 120a facing the brush holder 100.
The large-diameter conductive path 121 and the small-diameter conductive path 123, which are annular and face the 101a and the small-diameter concave section 101c, are arranged.
Opposite 1b, commutator pieces 122 divided into 18 equal parts are arranged in an annular shape.

The large-diameter conductive path 121 and the small-diameter conductive path 123 partially have terminal pieces 121a and 123a extending from them, penetrating the disk portion 120a and projecting to the outer surface, and 18 commutator pieces 122 are provided. Each of the terminal pieces 122a penetrates the disc portion 120a and projects to the outer surface.

The outer stator 130 arranged on the outer periphery of the inner rotor 90 has a structure in which a yoke 131a of a stator core 131 is wound with a power generating coil 132 and a starting coil 133.

A cylindrical portion 135 formed by axially extending the inner peripheral portion of the stator core 131 of the outer stator 130 is the governor outer 94 and the brush holder.
Cylindrical part of commutator holder 120 covering part of 100 and 1
It is connected to and supported by 20b (see FIGS. 1 and 2).

FIG. 17 shows a circuit in the starting mechanism of the embodiment. The starting coil 133 wound around the yoke 131a of the stator core 131 is electrically connected to a predetermined commutator piece 122 via a cord 134 extending from a predetermined position.

The large-diameter conductive path 121 is connected to the negative terminal of the battery 140 and grounded, the small-diameter conductive path 123 is connected to the C contact of the starter relay 141 which is a switching relay, and the positive terminal of the battery 140 is connected to the starter. Relay 141
Is connected to the normally open type NO contact and is also connected to one end of the relay coil 141a of the starter relay 141.

The normally closed NC contact of the starter relay 141 is connected to the large diameter conductive path 121. Relay coil 14
The other end of 0a is connected to one terminal of the starter button 142,
The other terminal is grounded.

Four pieces supported by the brush holder 100
Side brushes 110a, 110b, 110c, 110d and four + side brushes 11
2a, 112b, 112c, and 112d move respectively to the large diameter conductive path 121, the commutator piece 122, and the small diameter conductive path 123 of the commutator holder 120 so as to be separable from each other.

The minus side brush 110a can be brought into and out of contact with the large-diameter conductive path 121, and the other minus side brushes 110b, 110c and 110d can be brought into and out of contact with the commutator piece 122, respectively. The four 122-side brushes 110a,
110b, 110c, and 110d are in a conductive state by the-side terminal plate 105.

Further, the + side brush 112a can be brought into contact with and separated from the small-diameter conductive path 123, and the other + side brushes 112b, 112c and 112d can be brought into and out of contact with the commutator piece 122, respectively, and the commutators arranged in an annular shape in contact with each other. The four + brushes 112 that come into contact with the pieces 122 sequentially
The a, 112b, 112c, and 112d are electrically connected by the + side terminal plate 106.

A total of eight brushes 110a, 110b, 110c, 110d,
112a, 112b, 112c, 112d large diameter conductive path 121, commutator piece 12
2.The contact and separation with the small-diameter conductive path 123 are automatically performed, and if the rotation speed of the crankshaft 83 is less than the predetermined rotation speed less than the idle rotation speed, the brushes have the predetermined large diameter due to the urging force of the spring 99. The conductive path 121, the commutator piece 122, and the small-diameter conductive path 123 are in contact with each other (see FIG. 1). When the rotational speed exceeds a predetermined value, the ball 98 acts on the tapered bottom wall 96d of the pocket 96c of the governor inner 96 by centrifugal force. Spring
Overcome the urging force of 99 and move the governor inner 96 together with the brush holder 100, and the brushes are all in a large diameter conductive path.
121, the commutator piece 122, and the small-diameter conductive path 123 (see FIG. 2)
reference). 1000 to 1600 for an internal combustion engine with an idle speed of about 1800 rpm for an internal combustion engine with two cycles of 50cc
It is preferable that the brush separates at about rpm.

Therefore, when the number of revolutions is not more than a predetermined value, the brush has a predetermined large-diameter conductive path 121, a commutator piece 122, and a small-diameter conductive path.
When in contact with 123, the relay contact C-NO of the starter relay 141 is closed to connect the battery 140 and the starting coil 133 to form a first closed circuit, and the relay contact C-NO is also connected. Is opened and the relay contacts C and NC are closed to form a second closed circuit of only the starting coil 133.

In the starter / generator 80 having the above-described structure, when the starter button 142 is turned on, the relay coil 141a is excited and the C contact of the starter relay 141 and the N-contact.
The O contact is closed and the first closed circuit is open, that is, the battery
Current from 140 is small diameter conductive path 123, + side brush 112a, + side terminal plate 106, three + side brushes 112b, 112
c, 112d, three commutator pieces 122 in order, and then flow to the required starting coil 133, and then the current flowing through the starting coil 133 has three commutator pieces 122, three-side brushes 110b, 110c,
110d, -side terminal plate 105, -side brush 110a,
It returns to the battery 141 via the large-diameter conductive path 121. The current flowing through the starting coil 133 causes a rotation torque in the inner rotor 90 to rotate the crankshaft 83 and start the internal combustion engine.

When the starter button 142 is off and the C contact and NC contact of the starter relay 141 are closed and the internal combustion engine is about to stop, the brush is a predetermined large-diameter conductive path 121 and a commutator piece. 122, the second closed circuit communicates with the small-diameter conductive path 123 (state shown in FIG. 17), that is, the starting coil 133 forms a closed circuit through contact between the brush and the commutator piece. , Inner rotor 90
The rotation causes the starting coil 133 to generate an electromotive force, and the starting coil 133 acts as a generator coil, and a current flows through the second closed circuit, so that a braking torque due to magnetic friction acts on the inner rotor 90.

Therefore, the reverse rotation of the crankshaft 83 immediately before the stop in the two-cycle internal combustion engine is prevented by this braking torque. In particular, in the case of the rotating inner magnet type inner rotor 90 having a small displacement (50 to 100 cc) and a small rotational inertia as in the present embodiment, the possibility of the crankshaft 83 reversing immediately before the stop is higher than that of others. Is so big that the starting coil
It is effective to prevent reverse rotation by using 133 as a generator coil to generate braking torque. 2 cycles
In a 50cc internal combustion engine, if the brushes come into contact with each other at 500 rpm and the magnetic friction works, the reverse rotation can be effectively suppressed. When the brush is rotating normally beyond the predetermined number of rotations, the brush is separated from the large-diameter conductive path 121, the commutator piece 122, and the small-diameter conductive path 123, and the starting coil does not become a load.

In this embodiment, since the rotating inner magnet type inner rotor 90 is disposed inside the stator core 131, the rotating inertia is small and does not impose a load on the performance of the internal combustion engine, and the entire apparatus is small and lightweight. Further, the brush and the commutator are provided on the side of the inner rotor 90 to avoid the influence of heat and not to affect the performance of the brush.

Since the brush and the commutator piece / conductive path are automatically contacted and separated by utilizing the centrifugal force of the ball 98,
It does not require both the mechanism that moves the brush holder in conjunction with the starter lever and the control mechanism that controls the connection and disconnection of the circuit based on the rotation speed detection signal of the internal combustion engine. It is done automatically by the ball mechanism. Therefore, the structure can be simplified and the cost can be reduced.

Next, an embodiment in which the two-cycle internal combustion engine 200 is actually equipped with the starter / generator 250 will be described with reference to FIG. In the two-cycle internal combustion engine 200, a cylinder block 203 and a cylinder head 204 are sequentially combined with a crankcase 202 that is a combination of left and right cases that rotatably support a crankshaft 201 that is horizontally oriented, and a cylinder provided with a cooling fin 203a. In addition to the exhaust passage (not shown), the block 203 has a scavenging passage 205 formed from a scavenging port that opens to the cylinder bore.
It communicates with the crank chamber of 202.

The cylinder head 204 has a spark plug 206.
Of the cylinder head 204 and the cylinder block 203 except for the exposed portion of the spark plug 206.
Is covered with Fansheraud 207. Fan shell
A hot air duct 208 extends from an opening formed in a part of the left side of 207 and leads to a carburetor (not shown), and has a structure that sends warm air heated by a cylinder block 203 to the carburetor.

The left crank crank case 202L doubles as a belt type continuously variable transmission case, and the left crank crank case 202L is the same.
A belt drive pulley 210 is rotatably provided on a crankshaft 201 extending through the shaft.

The belt driving pulley 210 is composed of a fixed pulley half body 210L and a movable pulley half body 210R, and the fixed pulley half body 210L is provided on the left end of the crankshaft 201 with a boss 211.
The movable pulley half 210R is spline-fitted to the crankshaft 201 on the right side of the fixed pulley half 210L so that it can approach and separate from the fixed pulley half 210L. The belt 212 is sandwiched and wrapped around.

A cam plate 215 is fixed to the crankshaft 201 on the right side of the movable pulley half 210R, and a slide piece 215a provided at the outer peripheral end of the cam plate 215 is attached to the movable pulley half.
It is slidably engaged with a cam plate sliding boss portion 210Ra formed on the outer peripheral end of 210R in the axial direction.

Cam plate 215 of movable pulley half 210R
The side surface is tapered toward the cam plate 215 side, and a dry weight roller 216 is housed between the cam plate 215 inside the tapered surface.

Therefore, when the rotation speed of the crankshaft 201 increases, the movable pulley half 210R and the cam plate
215 Dry weight roller 21 that rotates with it
6 moves in the centrifugal direction by the centrifugal force, and the movable pulley half body 210R is pressed by the dry weight roller 216 and moves leftward to approach the fixed pulley half body 210L. The V-belt 212 sandwiched between 210R is configured to be moved in the centrifugal direction to increase the winding diameter.

Corresponding to the belt driving pulley 76, a V-belt 212 is wound around a belt driven pulley (not shown) on the rear side, and the power is automatically adjusted and transmitted to a rear speed reduction mechanism or the like. Transmitted to the wheel.

The transmission case cover 220 that covers the belt type continuously variable transmission chamber from the left side is the belt drive pulley 21 in the front.
It extends backward from 0 and covers it, and kick shaft 22
1 is rotatably supported through, and a drive helical gear 222 is fitted to the inner end of the kick shaft 221 and is biased by a return spring 223.

On the inner surface of the front part of the transmission case cover 220, a sliding shaft 224 is supported coaxially with the crankshaft 201 so as to be rotatable and axially slidable, and the sliding shaft 224 has a driven helical gear 225. Is formed and meshes with the drive helical gear 222, a ratchet wheel 226 is fixed to the right end, and the whole is biased to the left by the friction spring 227. On the other hand, on the boss 211 on the crankshaft 201 side, a ratchet is formed so as to face the ratchet wheel 226.
It can be contacted and separated by sliding 4.

Therefore, when the kick pedal is depressed and the kick shaft 221 rotates against the return spring 223, the drive helical gear 222 rotates integrally with the kick shaft 221, and the driven helical gear 225 meshing with this rotates the sliding helical gear 225.
4 Rotate together with 4 and slide to the right against friction spring 227, ratchet wheel 226
The internal combustion engine 200 can be started by meshing with the ratchet 211 and forcibly rotating the crankshaft 201.

On the other hand, the right crankcase 202R extends in a substantially cylindrical shape on the right side of a main bearing 209 that rotatably supports the crankshaft 201, and the crankshaft 201 projects from the central axis thereof. This right crankcase 202R
The starter / generator 250 is arranged in the cylinder.

The inner rotor 251 has a nut boss 252 fitted to the crankshaft 201 protruding rightward.
Tightened with 253, the rotor boss 252 has a substantially cylindrical shape,
It has a small-diameter cylindrical portion 252a with a slightly reduced diameter inside, and magnets 254 are fitted at six locations on the outer periphery of the large-diameter cylindrical portion.

The governor outer 255 tapering to the outer periphery of the small diameter cylindrical portion 252a of the rotor boss 252 and opening leftward
However, the inner opening edge is fixed to the rotor boss 252 by rivets 256. Governor Outer 255
Are formed in the taper inner peripheral surface with six grooves oriented in the axial direction, and the outer opening edge corresponding to each groove is bent slightly closed to the shaft.

On the other hand, a governor inner 258 is fitted on the peripheral surface of the small-diameter cylindrical portion 252a of the rotor boss 252 so as to be slidable in the left-right axial direction. The governor inner 258 is located outside the cylindrical portion at six places. The opened pocket 259 is bulged and the bottom wall of the pocket 259 is tapered obliquely. A metal ball 260 is accommodated in the pocket 259, and the governor outer is closed so as to close the opening of the pocket 259.
There are 255 tapered walls located.

A plurality of connecting portions 258a formed by extending a part of the cylindrical portion of the governor inner 258 to the right,
Penetrates the large-diameter cylindrical portion of the rotor boss 252 and
2 Fix the end to the brush holder 262 that is slidably supported in the
The brush holder 258 and the brush holder 262 can slide together.

Therefore, the governor inner 258 is biased to the right by the spring and is in the state shown by the solid line in FIG.
When the rotation speed of the inner rotor 251 increases, the ball 26
0 pushes the pocket bottom wall of the governor inner 258 in an attempt to move in the centrifugal direction along the taper wall of the governor outer 255, and slides leftward together with the brush holder 262 as shown by a two-dot chain line in FIG.

The brush holder 262 has substantially the same structure as that of the brush holder 100 in the above-described embodiment. The brush holder 262 has a brush 263 projecting at a predetermined position on the right side surface of the brush holder 262. The terminal plate is electrically connected, and the-side brushes are electrically connected to each other by the-side terminal plate, which is similar to the above-described embodiment.

The commutator holder 265 arranged corresponding to the brush holder 262 also has the same structure as the commutator holder 120, and the large diameter conductive path 266 and the commutator piece are provided on the surface facing the brush holder 262. A small diameter conductive path 267 and a small diameter conductive path 268 are concentrically arranged. The commutator holder 262 is an outer stator arranged on the outer periphery of the inner rotor 251.
Backed by 270.

The outer stator 270 is the stator core 27.
In this structure, the power generation coil 272 and the starting coil 273 are wound around the first yoke, and the stator core 271 is fixed to the right crankcase 202R in a cylinder of the right crankcase 202R. The electric circuit of the starting mechanism of the starter / generator 250 is the same as that shown in FIG. 17 of the above embodiment.

The crankshaft 201 penetrates the commutator holder 262, extends further to the right, and a forced air cooling fan 280 is attached to the tip thereof, and a fan cover 281 is attached to the right side of the forced air cooling fan 280. Are connected to the fan shell 207.

The starter / generator 250 provided in the present two-cycle internal combustion engine 200 has the above-described structure, and is integrated with the crankshaft 201 into the inner rotor 251.
When the rotating speed of the governor inner 258 and the brush holder 262 is to the right as shown by the solid line in FIG. 18, and the brush 263 is the large-diameter conductive path of the commutator holder 265. 266, the commutator piece 267, and the small-diameter conductive path 268 are in contact with each other, but when the number of rotations exceeds a predetermined number, the governor mechanism causes the brush holder 262 to slide to the left as shown by the chain double-dashed line in FIG. 263 is separated from the large diameter conductive path 266, the commutator piece 267, and the small diameter conductive path 268.

Therefore, immediately before the two-cycle internal combustion engine 200 is stopped, the brush 263 has the large-diameter conductive path 266, the commutator piece 267, and the small-diameter conductive path 26 of the commutator holder 265 at a predetermined rotational speed or less.
Since it is in contact with 8 and the starter button is not pressed, the second closed circuit of the starting coil 273 is open,
The rotation of the inner rotor 251 produces an electromotive force in the starting coil 273, and the starting coil 273 acts as a generator coil.
A current flows through the second closed circuit, so that braking torque due to magnetic friction acts on the inner rotor 251. 2
Crankshaft immediately before stopping in a cycle internal combustion engine
The reverse rotation of 83 is blocked by this braking torque.

At the time of starting, the starter button is pushed, the first closed circuit is opened, and the electric power of the battery is changed to the brush.
263 commutator holder 265 large diameter conductive path 266, commutator strip
267, supplied to the starting coil through contact with the small-diameter conductive path 268, and a current flowing through the starting coil 133 causes a rotation torque in the inner rotor 251 to rotate the crankshaft 201 and start the internal combustion engine. Therefore, a starter motor dedicated to starting is not required, and space saving, weight reduction, and cost reduction can be realized.

[0067]

According to the present invention, in the state where the commutator and the brush are in contact with each other immediately before the two-cycle internal combustion engine is stopped, the second contact is closed and the second closed circuit including only the starting coil is connected. With the rotation of the rotor, electromotive force is generated in the starting coil to cause a current to flow, and braking torque due to magnetic friction acts on the rotor to prevent reverse rotation of the crankshaft. If the normal speed is exceeded,
The starting coil does not load at all.

It is not necessary to add a moment of inertia to the rotor to prevent reverse rotation, and it is possible to avoid an increase in the size and weight of the device, and a starting coil is used, which is advantageous in terms of space and cost. Is.

By composing the brush contact / separation mechanism with a centrifugal automatic speed governor, the commutator and the brush are contacted / separated with a simple mechanical structure on the basis of a predetermined rotation speed of the two-cycle internal combustion engine. be able to.

The first contact and the second contact are used as relay contacts, and a switch mechanism is constituted by a relay device that opens and closes the relay contacts by operating the starter switch. Switch mechanism.

[Brief description of drawings]

FIG. 1 is a side sectional view of a starter / generator according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the starter / generator in another state.

FIG. 3 is a front view of an inner rotor.

FIG. 4 is a rear view of the same.

FIG. 5 is a sectional view taken along line VV in FIG. 3;

FIG. 6 is a front view of a governor inner.

FIG. 7 is a rear view of the same.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a front view of the brush holder.

FIG. 10 is a rear view of the same.

11 is a cross-sectional view taken along the line XI-XI in FIG.

FIG. 12 is a perspective view of a-side terminal plate.

FIG. 13 is a perspective view of a + side terminal plate.

FIG. 14 is a front view of a commutator holder.

FIG. 15 is a rear view of the same.

16 is a cross-sectional view taken along the line XVI-XVI in FIG.

FIG. 17 is a circuit diagram of the starting mechanism of the embodiment.

FIG. 18 is a cross-sectional view of a starter / generator installed in a two-cycle internal combustion engine according to another embodiment.

[Explanation of symbols]

80 ... Starter / generator, 82 ... Crank case, 83 ... Crank shaft, 90 ... Inner rotor, 91 ... Rotor boss, 92
… Magnet, 93… Rotor cover, governor outer,
95 ... Rivet, 96 ... Governor inner, 97 ... Screw, 98 ...
Ball, 99 ... Spring, 100 ... Brush holder, 103
… Circular hole, 105… －side terminal plate, 106… ＋ side terminal plate, 110a, 110b, 110c, 110d… －side brush, 112a, 112b, 112c, 112d… ＋ side brush, 115… spring, 116… stopper, 120… commutator holder, 121
… Large diameter conductive path, 122… Commutator piece, 123… Small diameter conductive path, 13
0 ... Outer stator, 131 ... Stator core, 132 ... Generator coil, 133 ... Starting coil, 134 ... Cord, 135 ... Cylindrical part, 140 ... Battery, 141 ... Starter relay, 142 ...
Starter button, 200 ... 2-cycle internal combustion engine, 201 ... Crank shaft, 202 ... Crank case, 203 ... Cylinder block, 204 ... Cylinder head, 205 ... Scavenging passage,
206 ... Spark plug, 207 ... Fan shroud, 208 ... Hot air duct, 209 ... Main bearing, 210 ... Belt drive pulley, 211 ... Boss, 212 ... V belt, 215 ... Cam plate, 216 ... Dry weight roller, 220 ... Transmission case Cover, 221 ... Kick shaft, 222 ... Drive helical gear, 223
… Return spring, 224… Sliding shaft, 225… Driven helical gear, 226… Ratchet wheel, 227… Friction spring, 250… Starter / generator, 251… Inner rotor, 252… Rotor boss, 253… Nut, 254… Magnet, 255… Governor outer, 256… Rivet,
258… Governor inner, 259… Pocket, 260… Metal ball, 262… Brush holder, 263… Brush, 265…
Commutator holder, 266… Large diameter conductive path, 267… Commutator, 26
8 ... Small diameter conductive path, 270 ... Outer stator, 271 ... Stator core, 272 ... Generator coil, 273 ... Starting coil, 280
… Forced air cooling fan, 281… Fan cover.

Claims (3)

[Claims] 1. A starter / generator for a two-cycle internal combustion engine, comprising a starter coil separately from the generator coil, and supplying power to the starter coil through contact between a brush and a commutator. A brush contacting / separating mechanism that contacts and separates the brush and the commutator on the basis of a predetermined number of revolutions lower than the number of revolutions, contacts the brush and the commutator at a predetermined number of revolutions or less, and separates them when the number of revolutions exceeds the predetermined number of revolutions. When the switch is turned on, the first contact is closed and the second contact is closed.
A switch mechanism for opening a contact of the battery, a first closed circuit formed by connecting the battery and the starting coil through the closed first contact and the contacted brush and commutator, and the closed first 2. A starter / generator for a two-cycle internal combustion engine, comprising: two contact points, the brushes that are in contact with the second contact point, and a second closed circuit formed only by the starter coil via a commutator. 2. The starter / generator for a two-cycle internal combustion engine according to claim 1, wherein the brush contacting / separating mechanism comprises a centrifugal automatic speed governor. 3. The switch mechanism is a relay device that uses the first contact and the second contact as relay contacts and opens and closes the relay contacts by operating the starter switch. Alternatively, the two-cycle internal combustion engine starter / generator according to the second aspect.