JPH0237112A - Supercharger driving apparatus of engine - Google Patents

Abstract

PURPOSE:To continue rotation of a supercharger when a generator is stopped by connecting a pressure wave supercharger to a generator, which is connected with an engine output shaft, with a mediating one-way clutch. CONSTITUTION:A crankshaft 32 of an engine and an intermediate shaft 58 of a generator 60 are connected each other with a belt 64. A one-way clutch 68 is fixed in the other end of the intermediate shaft 58 of the generator 60, and having the one-way clutch 68 between them, a pressure wave supercharger 12 and the generator 60 are connected each other with a belt 74. When the belt 64 is cut, the pressure wave supercharger 12 maintains its rotating state due to the pressure of a discharged gas. The rotation of the supercharger can thus be continued.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an engine for supercharging intake air based on exhaust pressure waves of exhaust gas to drive a supply pressure wave supercharger in a cylinder. This invention relates to a supercharger drive device.

[Prior Art] A pressure wave supercharger has been known as one of the superchargers for supercharging intake air to an engine, as disclosed in Japanese Patent Publication No. 38-1153. This pressure wave supercharger consists of a rotor that is rotatably supported within a case and has a number of partition walls arranged radially to form a number of small chambers, and an air intake inlet formed in the case at one end of the rotor. , an air intake/discharge port, an exhaust gas introduction port formed in the case on the other end side of the rotor, and an exhaust gas discharge port.

Then, as the rotor rotates, the intake air is drawn into the small chamber of the rotor from the intake inlet, and the exhaust gas is caused to flow into this small chamber from the exhaust inlet, and the intake air is compressed and accelerated by the pressure difference between the two. Supercharged intake air is discharged from the intake and discharge ports at the timing when the intake and discharge ports communicate with the intake pipe. That is, the intake air is supercharged by transmitting the pressure wave energy of the exhaust gas to the intake air.

On the other hand, in this pressure wave supercharger, while supercharging the intake air, the exhaust gas remaining in the small chamber described above is discharged from the exhaust discharge port to the exhaust pipe, and the exhaust vacuum generated during this discharge is Based on the pressure, new intake air is introduced into this small chamber from the intake port at the timing when the intake port communicates with the intake pipe. In this way, it is configured to repeatedly perform scavenging and cooling the rotor.

In such a pressure wave supercharger, as mentioned above,
It becomes necessary to rotate the rotor. When rotating this rotor, it is preferable to rotate the rotor at high speed due to the requirement to shorten the small chambers mentioned above in order to make the supercharger compact (for example, the rotor rotates at high speed for one revolution of the crankshaft). (more than 3 times).

Here, if you try to make the rotor rotate 4 times per 1 revolution of the crankshaft, the diameter of the pulley attached to the crankshaft should be 4 times larger than the diameter of the bobber attached to the drive shaft of the rotor. You will have to set it to However, it is difficult to attach such a large pulley to the crankshaft due to its structure.

For this reason, it is conceivable to achieve a pulley ratio of 1:4 via an intermediate bobbin that has twice the diameter of the pulley attached to the drive shaft of the rotor. Rather than attaching this intermediate pulley to a dedicated intermediate shaft, from the perspective of simplifying the configuration, it is conceivable to attach it to the drive shaft of the generator, which must be constantly rotated by the crankshaft. It is.

[Problems to be Solved by the Invention] In this way, without increasing the size of the configuration, an intermediate boost is attached to the drive shaft of the generator, and via this, the crankshaft is substantially adjusted at the target boost ratio. It becomes possible to transmit the rotation of the pressure wave supercharger to the rotor of the pressure wave supercharger.

However, if the endless belt that connects the crankshaft and the generator drive shaft breaks,
Even if the rotor itself has obtained rotational driving force to the extent that it can maintain rotation due to the exhaust pressure of exhaust gas, the moment when the driving force from the engine output shaft to the generator's drive shaft is cut off. If power generation continues, the drive shaft of the generator becomes a load on the rotation of the rotor, and eventually
The rotation of the rotor itself will be stopped.

Here, when the rotation of the rotor is stopped while driving, not only is the supercharging of the intake air stopped, but also the intake pipe itself is separated by the rotor. Therefore, the intake itself will be stopped. As a result, the above-mentioned endless belt breaks, the intake air is interrupted, and the engine immediately stops. In this way, if the engine stops immediately due to a type of failure such as a rupture of the endless belt, it is impossible to drive the vehicle to a safe location to repair the failure, which is extremely problematic. be.

This invention has been made in view of the above-mentioned problems, and an object of the invention is to immediately transmit power even if the first driving force transmitting means for rotationally driving the generator loses its driving force transmitting ability. To provide a supercharger drive device for an engine, which can maintain the rotation of the rotor of a pressure wave supercharger without stopping the rotor and prevent the rotation of the engine from immediately stopping. It is.

[Means for Solving the Problems] In order to solve the above-mentioned problems and achieve the purpose, an engine supercharger drive device according to the present invention is connected to an output shaft of an engine and drives a generator to rotate. a first driving force transmitting means for rotating the pressure wave supercharger; a second driving force transmitting means connected to the drive shaft of the generator to rotationally drive the pressure wave supercharger; and the first driving force transmitting means. but a reduction means for reducing the load on the pressure wave supercharger in the generator when the driving force transmission ability is lost, and the pressure wave supercharger is maintained in a rotationally driven state by the exhaust pressure of exhaust gas. It is characterized by being equipped with maintenance means.

[Function] In the engine supercharger drive device configured as described above, even if the driving force transmission capability of the first driving force transmission means that rotationally drives the generator is lost, the pressure in the generator is maintained. The load on the wave supercharger will be reduced. As a result, the pressure wave supercharger is maintained in a rotationally driven state by the exhaust pressure of the exhaust gas, and air continues to be drawn into the engine. In this way, an immediate stoppage of the engine is avoided and the engine can continue to drive.

[Embodiment] Hereinafter, the configuration of an embodiment of an engine supercharger drive device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an engine 14 equipped with a pressure wave supercharger 12 driven by a supercharger drive device 10 according to one embodiment.

This engine 14 has four cylinders 16a, 1st to 4th.
It is a four-cylinder engine having 16d to 16d, and intake branch pipes 18a to 18d are connected to these four cylinders 16aN16d, respectively.
18d is connected to one intake main pipe 20 at its tip. The tip of this intake main pipe 20 is connected to an air cleaner (not shown), and each cylinder 16a to 16d draws air into the corresponding cylinder 16a to 16d at the opening timing of a correspondingly arranged intake valve (not shown). is set to be introduced.

In addition, exhaust branch pipes 22 are provided in the four cylinders 16a to 16d.
a to 22d are connected to each other, and these four exhaust branch pipes 22a to 22d are connected to one exhaust main pipe 24 at their terminal portions. A midway portion of the exhaust main pipe 24 is open to the atmosphere via a catalyst device and a muffler (not shown) for purifying exhaust gas. And each cylinder 1
6a to 16d are the opening timings of the correspondingly arranged exhaust valves (not shown), and the corresponding cylinders 16a to 16d are opened.
The exhaust gas is set to be discharged from the

While straddling these intake main pipes 20 and exhaust main pipes 24,
A pressure wave supercharger 12 is provided. As shown in FIG. 2, the pressure wave supercharger 12 includes a cylindrical case 26, within which a rotor 28 is rotatably supported. Rotating shaft 30 of this rotor 28
is connected to a crankshaft 32 serving as an output shaft of the engine 14 via a supercharger drive bag #10 which is a feature of the present invention and will be described in detail later.

Further, on the outer periphery of the rotor 28 described above, a large number of partition walls 34 are provided.
are arranged radially. A large number of small chambers 36 are formed on the outer periphery of the rotor 28 by a pair of partition walls 34 adjacent to each other, and extend along the axial direction of the rotor 28 .

Here, an intake inlet 38 and an intake outlet 40 are independently formed on the side end surface of the case 26 on the intake main pipe 20 side. This intake air introduction 038 communicates with a portion 20a of the main intake pipe 20 on the upstream side of the pressure wave supercharger 12, and the intake discharge port 40 communicates with a portion 20b of the main intake pipe 20 on the downstream side of the pressure wave supercharger 12. It's communicating. In other words, this intake main pipe 20 is connected to the upstream portion 2 by the pressure wave supercharger 12.
It is divided into a downstream portion 0a and a downstream portion 20b.

On the other hand, as shown in FIG. 3, an exhaust inlet 42, an exhaust outlet 44, and a boat 46 are independently formed on the side end surface of the case 26 on the exhaust main pipe 24 side. This exhaust inlet 42 is connected to the pressure wave supercharger 12 of the exhaust main pipe 24.
The exhaust discharge port 42 communicates with the part 24a on the upstream side of the exhaust main pipe 24, and the exhaust outlet 42 communicates with the part 24a on the downstream side of the pressure wave supercharger 14 of the exhaust main pipe 24.
It communicates with 4b. In other words, the exhaust main pipe 24 is divided by the pressure wave supercharger 12 into an upstream portion 24a and a downstream portion 24b.

Further, as shown in FIG. 3, the boat 46 described above is located adjacent to the exhaust outlet 44 and on the leading side of the exhaust outlet 44 along the rotational direction X of the rotor 28. It is well placed. This boat 46
is connected to the intake air inlet 3 via the recirculation passage 48 shown in FIG.
8 is connected to a portion 20a of the intake main pipe 20 on the upstream side. In this way, a portion of the intake air is configured to be returned to the intake air introduction port 38 side as rotor cooling air flowing through the small chamber 36 of the rotor 28 from the intake air introduction port 38.

In the pressure wave supercharger 12 configured as above,
Due to the action of the supercharger drive device 10, which will be described later, the rotor 28
As the pump rotates, high-pressure exhaust gas flows from the upstream portion 24a of the exhaust main pipe 24 through the exhaust inlet 42 into the small chamber 36 in which low-pressure intake air is confined. In response to this inflow of exhaust gas, a positive pressure wave (compression shock wave) is generated within the small chamber 36 due to the pressure difference. This pressure wave propagates within the small chamber 36, and the pressure wave energy of the exhaust air is transmitted to the intake air. In this way, in the first stroke, the intake air is compressed and accelerated, and is discharged from the intake outlet 4o to the downstream portion 20b of the intake main pipe 20, thereby supercharging the intake air.

On the other hand, along with this supercharging operation, the end of the small chamber 36 moves from a position facing the intake/discharge port 40 to a position facing the inner end surface of the case 26 as the rotor 28 rotates.

As a result, when the exhaust gas flows into the small chamber 36 and advances while compressing the intake air, when it reaches the end of the small chamber 36, it collides with the inner end surface of the case 26 and reverses, and from the exhaust outlet 44, It is discharged to the downstream portion 24b of the exhaust main pipe 24.

Here, as the exhaust gas is discharged, a negative pressure wave is generated within the small chamber 36. Then, at the timing when the end of this small chamber 36 faces the intake inlet 38 as the rotor 28 rotates, the upstream portion of the intake main pipe 20
New intake air enters the small chamber 36 from 0a through the intake inlet 38.
It will be introduced inside. Further, as this new intake air advances and flows into the small chamber 36 of the rotor 28, exhaust air is scavenged and the rotor 28 is cooled. In this way, a series of supercharging of the intake air is performed, and this is repeatedly performed as the rotor 28 rotates.

As shown in FIG. 1, on the side end surface of the case 26 on the intake main pipe 20 side, on the trailing side from the intake outlet 40 along the rotational direction X of the rotor 28, there is a first compression pocket defined as a compression pocket. A recess 50 is formed. This first recess 50 is provided to obtain an effective supercharging effect even when the rotor 28 is in a low rotation range.

Further, on the side end surface of the case 26 on the exhaust main pipe 24 side, on the leading side of the exhaust inlet 42 along the rotational direction X of the rotor 28, a second recess 5 defined as a gas pocket is provided.
2 is formed. Furthermore, the intake main pipe 20 of the case 26
A third recess 54 defined as an expansion pocket is formed on the leading side of the side end face in the direction of rotation of the rotor 28 from the intake/discharge port 40 . These second and third recesses 52 and 54 are provided to enable low-pressure scavenging in the entire operating range of the engine 14 by mutual interaction.

Rotor 28 of pressure wave supercharger 12 configured as described above
The configuration of the supercharger drive device 10 for rotationally driving the
This will be explained in detail with reference to FIG.

As explained in the prior art, this supercharger drive device 10 transmits the rotation of the crankshaft 32 to the rotating shaft 30 of the rotor 28 in a 1:4 ratio. In order to prevent the diameter of the pulley 56 from becoming large, an intermediate shaft 58 is provided, and this intermediate shaft 58 also serves as a drive shaft for the generator 60.

That is, this generator 60 is powered by a stay (not shown).
It is attached to the cylinder block of the engine 14, and its drive shaft 58 is set to extend along the same direction as the direction in which the crankshaft 32 extends. Since this generator 60 has a well-known configuration, its explanation will be omitted.

Here, this supercharger drive device 10 includes a small-diameter second pulley 62 coaxially fixed to one end of the intermediate shaft 58 on the side where the first pulley 56 is provided. A first endless belt 64 for driving a generator is wound between the first and second pulleys 56 and 62 via an idle pulley 66. Note that the diameter of the second pulley 62 is set to half the diameter of the first pulley 56.

With the above configuration, in response to the rotation of the crankshaft 32 of the engine 14, the drive shaft 58 of the generator 60 rotates at twice the rotation speed of the crankshaft 32.
The power generation operation will be performed at o.

On the other hand, the other end of the drive shaft 58 of this generator 60 is connected via a one-way clutch 68 as one aspect of reducing means.
A third pulley 70 with a large diameter is coaxially attached.

Further, at one end of the drive shaft 30 of the pressure wave supercharger 12 on the side where the third pulley 70 is provided, there is a fourth pulley 7 with a small diameter.
2 are fixed coaxially. A second endless belt 74 for driving the supercharger is wound between the third and fourth pulleys 70, 72. Furthermore, this fourth pulley 7
2 is set to half the diameter of the third pulley 70.

Here, the one-way clutch 68 described above, whose configuration will be described later, is configured to transmit the rotation of the intermediate shaft 58 to the third pulley 70 but not to transmit the rotation of the third pulley 70 to the intermediate shaft 58. has been done.

With the above configuration, as the crankshaft 32 of the engine 14 rotates, the pressure wave supercharger 12 is rotated through the intermediate shaft 58 at a rotation speed four times the rotation speed of the crankshaft 32.
The drive shaft 30 rotates, and the rotor 28 rotates in accordance with the rotation of the drive shaft 30, thereby performing an intake air supercharging operation.

The configuration of the one-way clutch 68 described above will be explained in detail below with reference to FIG. 4, FIG. 5A, and FIG. 5B.

As described above, this one-way clutch 68 transmits the rotation of the intermediate shaft 58 in the direction indicated by the arrow X (i.e., the rotational direction of the rotor 28) to the third pulley 70. It is configured so that rotation along the same direction is not transmitted to the intermediate shaft 58. In other words, in this one-way clutch 68, the relative rotation of the intermediate shaft 58 to the third pulley 70 in the direction indicated by the arrow X is transmitted to the third pulley 70, but the relative rotation in the direction indicated by the arrow Rotation along the opposite direction is set not to be transmitted.

That is, as shown in FIG. 4, this one-way clutch 6
Reference numeral 8 has four holes 76a to 76d that are respectively formed to open on the inner circumferential surface 70a of the third pulley 70, on which the intermediate shaft 58 slides. These holes 76a~
76d equiangularly along the inner circumferential surface 70a, that is,
The holes 76a to 76d are arranged at intervals of 90 degrees, and are formed to extend along the direction in contact with the inner circumferential surface 70a. Further, each of the holes 76a to 76d is opened at the point of contact with the inner circumferential surface 70a, and is set to extend from this opening toward the trailing direction with respect to the rotational direction indicated by the arrow X.

Furthermore, one engagement ball 78a to 78d is loosely inserted into each of the holes 76a to 76d. Similarly, each of the engaging balls 78a to 78d is connected to the corresponding hole 76.
Coil springs 80a housed in a to 76d, respectively.
~80d, it is biased in the direction indicated by arrow X. In this way, each engagement ball 78a~
78d is set to be able to frictionally engage with the outer peripheral surface of the intermediate shaft 58.

Here, this supercharger drive device 10 includes a pressure wave supercharger 12
As a maintenance means for maintaining the rotational drive state by the exhaust pressure of the exhaust gas, the exhaust gas introduction direction from the upstream portion 24a of the exhaust main pipe 24 to the exhaust gas introduction port 38 is set at a predetermined angle with respect to the partition wall 34 of the rotor 28. , is provided with a structure that is inclined in the direction along the rotation direction X. Specifically, each partition wall 34 is configured to move the rotor 28 in the direction indicated by the arrow The rotor 28 is inclined so that the driving force for rotating the rotor 28 is applied as a force component along the circumferential direction of the rotor 28.

In this way, the rotor 28 is always urged to rotate in the direction indicated by the arrow X by the exhaust gas in a state where the exhaust gas is constantly flowing in, except at the time of startup. In other words, the rotating state is maintained.

As described above, this one-way clutch 68 is configured, and the exhaust main 24 is connected to each partition wall 34 of the rotor 28.
Since the upstream portion 24a of the is inclined, in this embodiment, the distance between the crankshaft 32 and the intermediate shaft 58 is
In a state where the first endless belt 64 is not cut and the rotational force is being transmitted well, as shown in FIG. 5A, the intermediate shaft (i.e., the drive shaft of the generator 60) 58 is , it rotates along the direction indicated by arrow X. While the intermediate shaft 58 is rotating, each of the engaging balls 78a to 78d is frictionally engaged with the outer peripheral surface of the intermediate shaft 58 due to the biasing force of the corresponding coil spring 80a to 80d. On the other hand, each of the engaging balls 78a to 78d is also pushed into the corresponding hole 7 by the biasing force of the corresponding coil spring 80a to 80d.
It also comes into contact with and engages with the end surfaces 70b of 6a to 76d on the leading side with respect to the rotational direction X.

In this way, as the intermediate shaft 58 rotates in the direction indicated by the arrow X, the intermediate shaft 58 and the third pulley 70 are brought into frictional engagement via the four engagement balls 78a to 78d. Become. That is, the intermediate shaft 58 engages with the engagement balls 78a to 78d by frictional engagement, and these engagement balls 78
a to 78d, the end surface 70b of the third pulley 70 is
It will be pushed in along the direction shown. As a result, the rotation of the intermediate shaft 58 is transmitted to the third pulley 70, and both rotate together.

Therefore, in the supercharger drive device lO, as long as the first and second endless belts 64, 74 thereof are not cut, the generator 60 performs the power generation operation, and the pressure wave supercharger 12 The supercharging operation will be executed.

On the other hand, in the case where the first endless belt 64 of the supercharger drive device 10 is cut, the pressure wave supercharger 12 immediately stops driving, as will be explained in detail below. Therefore, the operating state of the engine 14 will not be stopped immediately.

That is, if the first endless belt 64 is cut for some reason, the crankshaft 32 of the engine 14
The driving force will not be transmitted to the intermediate shaft 58 that functions as the drive shaft of the generator 60. As a result, the generator 60
stops the power generation operation, and due to the presence of field current in the generator 60, its rotating shaft, that is, the intermediate shaft 58, receives drive resistance and eventually stops.

On the other hand, in the pressure wave supercharger 12, although the driving force cannot be obtained via the intermediate shaft 58, the inflow of exhaust gas is As a result, the rotor 28 continues to rotate.

As the rotor 28 rotates, the third boot 70 connected by the second endless belt 74 is rotated in the direction indicated by the arrow X. here,
As described above, the intermediate shaft 58 is stopped, but in this embodiment, the one-way clutch 68 is present between the third pulley 70 and the intermediate shaft 58.
Even though the intermediate shaft 58 is stopped, in other words, the rotor 28 can continue to rotate without being loaded.

Specifically, as shown in FIG. 5B, when the third pulley 70 rotates in the direction indicated by the arrow This means rotating along the Here, since the intermediate shaft 58 and each of the engagement balls 78a to 78d are still in a frictionally engaged state, each of the engagement balls 78a to 78d is connected to the corresponding coil spring 80a.
It moves in the opposite direction to the direction indicated by arrow X against the urging force of ~80d.

Each of the engagement balls 78a to 78d is connected to the intermediate shaft 58 when the biasing force of the corresponding coil spring 80a to 80d exceeds the frictional engagement force with the outer peripheral surface of the intermediate shaft 58.
The relative positions within the corresponding holes 76a to 76d are fixed. In other words, the rotation of the third boob 970 is not transmitted to the intermediate shaft 58 due to the slip between each of the engaging balls 78a to 78d and the outer peripheral surface of the intermediate shaft 58.

In this way, the third pulley 70, i.e. the rotor 28 of the pressure wave supercharger 12, despite the stoppage of the intermediate shaft 58,
The inflow of exhaust gas allows it to rotate freely.

As a result, in this embodiment, air intake to the engine 14 continues until the battery (not shown) becomes empty (completely discharged) as the generator 60 stops generating electricity, and the first endless An immediate stop of the engine 14 due to the cutting of the belt 64 is avoided. Therefore, the driver can recognize when the generator 60 has stopped generating electricity by lighting up the warning lamp provided on the instrument panel of the driver's seat, and can drive the vehicle to a safe location with plenty of time to spare. Also, it becomes possible to transport it to a repair shop.

It goes without saying that this invention is not limited to the configuration of the one embodiment described above, and can be modified in various ways without departing from the gist of the invention.

For example, in one embodiment described above, the crankshaft 32
When the first endless belt 64 for transmitting the rotation of the generator 60 to the drive shaft (intermediate shaft) 58 is cut,
The fixed intermediate shaft 58 is connected to the rotor 28 of the pressure wave supercharger 12.
Although it has been explained that the one-way clutch 68 is provided as a reducing means for reducing the load on the pressure wave supercharger 12 in the generator 60 so as not to become a load on the rotation of the generator 60, the present invention is not limited to this. For example, as shown in FIGS. 6 to 8 as other embodiments,
A reducing means may be configured to reduce the load on the pressure wave supercharger 12 in the generator 60 by cutting off the field current in the generator 60 to bring the drive shaft 58 of the generator into a freely rotatable state. good.

The configuration of other embodiments will be explained below. In the following description, parts similar to the configuration of the above-mentioned embodiment include:
The same reference numerals will be given and the explanation thereof will be omitted.

As shown in FIG. 6, a detection switch 82 is attached to the idle pulley 66 to detect the cut state of the first endless belt 64 wound around the idle pulley 66. The detection switch 82 is turned off when the first endless belt 64 is not cut and is well wound around the idler pulley 966, and turned on when the first endless belt 64 is cut and falls off the idler pulley 66. It is set.

That is, as shown in FIGS. 7A and 7B, the idle boob 966 is a fixed pulley that is coaxially fixed to the idle boob shaft 66a and has an inner surface that engages with one side of the first endless belt 64. It is slidably inserted into the piece 66b and the idle booby shaft 66a via an insulator 66c,
A movable pulley piece 66d having an inner surface that engages with the other side of the first endless belt 64, and a coil spring 66e that urges the movable pulley piece 66d to abut against the stationary boolean piece 66b. It consists of

Here, the idle booby shaft 66a and the fixed side pulley piece 66
1) is integrally formed from a conductive material, and the movable pulley piece 66d is also formed from a conductive material. Further, the biasing force of the coil spring 66e is set to a size that allows the fixed pulley piece 66b and the movable pulley piece 66d to separate from each other when the first endless belt 64 exists between them. ing.

On the other hand, the above-mentioned detection switch 82 is always in sliding contact with the first brush 82a, which is electrically connected to the idle pulley shaft 66a, and with the moving side boob piece 66d. It is composed of a second brush 82b. Here, the first brush 82a is connected to a stop circuit 90, which will be described later, and the second brush 82b is installed.

As a result, as shown in FIG. 7A, when the first endless belt 64 is wound around the idle pulley 66, the moving side boob piece 66d resists the biasing force of the coil spring 66e. , and is separated from the fixed side boob piece 66b.

Therefore, the first brush 82a and the second brush 82b are electrically insulated from each other, and the detection switch 82 is set to be turned off.

Further, as shown in FIG. 7B, the first endless belt 64 wound around the idle pulley 66 is cut.
When the movable pulley piece 66d falls off, the fixed pulley 66b is moved by the biasing force of the coil spring 66e.
As a result, the stationary pulley piece 66b and the movable pulley piece 66d are electrically connected to each other. Therefore, the first brush 82a and the second brush 82
b are electrically connected to each other, and the detection switch 82 is set to be turned on.

On the other hand, as shown in FIG. 8, a field coil 84 through which a field current of the generator 60 flows is connected to an IC regulator 86. This IC regulator 86 is
The power transistor 88 has a collector connected to one end of a field coil 84, an emitter installed, and a base connected to the stop circuit 90.

This stop circuit 9o also includes the above-mentioned detection switch 8.
2 is connected, which operates to turn on the power transistor 88 when the detection switch 82 is turned off (when the first endless belt 64 is wound around the idle boob 966). , detection switch 82
It is configured to operate so as to turn off the power transistor 88 when it is turned on (when the first endless belt 64 is cut).

Since the other embodiments are configured as described above, when the first endless belt 64 is wound around the idler pulley 66, the detection switch 82 is turned off, and as a result, the detection switch 82 is turned off, and as a result, the power transistor 88
is turned on, and the field coil 84 is excited to generate a magnetic field for power generation. In this way, the generator 60 performs power generation operation well.

On the other hand, when the first endless belt 64 is cut and removed from the idler pulley 66, the detection switch 82 is turned on, and as a result, the power transistor 88 is turned off via the stop circuit 90, and the field flowing through the field coil 84 is turned off. Current is interrupted. In this way, the magnetic field for power generation disappears, and the drive shaft of the generator 60, that is, the intermediate shaft 5
8 is brought into a freely rotatable state.

Therefore, in another embodiment, the intermediate shaft 58 is activated by detecting the disconnected state of the first belt 64 via the detection switch 82, cutting off the field current, and extinguishing the magnetic field for power generation. The rotor 28 of the pressure wave supercharger 12 connected to the intermediate shaft 58 is brought into a rotatable state so that the intermediate shaft 58 does not become a load.

[Effects of the Invention] As detailed above, the engine supercharger drive device according to the present invention includes a first driving force transmission means connected to the output shaft of the engine and for rotationally driving the generator; When the second driving force transmitting means is connected to the drive shaft of the generator and rotationally drives the pressure wave supercharger, and the first driving force transmitting means loses the ability to transmit driving force. , a reduction means for reducing a load on a pressure wave supercharger in a generator;
The pressure wave supercharger is characterized by comprising a maintenance means for maintaining a rotationally driven state by the exhaust pressure of exhaust gas.

Therefore, according to the present invention, even if the first driving force transmitting means for rotationally driving the generator loses its driving force transmitting ability, the rotor of the pressure wave supercharger can be immediately stopped without stopping. Therefore, there is provided an engine supercharger drive device that can maintain the rotation of the rotor and prevent the rotation of the engine from immediately stopping.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram schematically showing a supercharger to which an embodiment of the supercharger drive device according to the present invention is attached in an expanded state, together with an engine to which it is connected; Fig. 2 is an embodiment of the supercharger drive device according to the present invention. A perspective view schematically showing the configuration of the supercharger drive device together with the supercharger; Fig. 3 is a side view showing the shape of the end face on the exhaust side of the case of the pressure wave supercharger; Fig. 4 is the supercharger A side view showing the configuration of a one-way clutch provided in the machine drive device; Fig. 5A is a sectional view partially showing the one-way clutch in a state where rotation of the intermediate shaft is transmitted to the third boot; 3 is a cross-sectional view partially showing the one-way clutch in a state where the rotation of the boob is not transmitted to the intermediate shaft; FIG. 6 schematically shows the configuration of another embodiment of the supercharger drive device according to the present invention. Fig. 7A is a cross-sectional view showing the structure of the idle pulley with the endless belt not cut; Fig. 7B is a cross-sectional view showing the structure of the idle pulley with the endless belt cut; Fig. 8 is a circuit diagram showing the connection relationship between the IC regulator shown in Fig. 6 and the belt breakage detector. 14...Engine, 16a N16d...Cylinder, 18a-18d...Intake branch pipe, 2o...
Intake main pipe, 20a... Upstream part of intake main pipe, 20b
...Downstream part of the intake main pipe, 22a to 22d...Exhaust branch pipe, 24...Exhaust main pipe, 24a...Upstream part of the exhaust main pipe, 24b...Downstream of the exhaust main pipe side part, 2
6... Case, 28... Rotor, 30... Rotating shaft, 32... Crankshaft, 34... Partition wall, 36...
Small chamber, 38... Intake inlet, 40... Intake outlet,
42...Exhaust inlet, 44...Exhaust outlet, 46.
... boat, 48 ... return passage, 50 ... first recess, 52 ... second recess, 54 ... third recess, 5
6... First pulley, 58... Intermediate shaft (drive shaft),
60... Generator, 62... Second pulley, 64...
・First endless belt, 66... Idle pulley, 66a... Idle bogie shaft, 66b... Fixed side boolean piece, 66c... Insulator, 66d... Moving side pulley piece, 66e ...Coil spring, 68...One-way clutch, 70...Third pulley, 70a.
...Inner peripheral surface, 72...Fourth pulley, 74...Second
Endless belt, 76a-76d...Hall, 7
8a-78d...engaging ball, 80a-80d...
Coil spring, 82...detection switch, 82a.
...First brush, 82b...Second brush, 84.
...Field coil, 86...IC regulator,
88...Power transistor, 9o...Stop circuit.

Claims (2)

[Claims] (1) A first driving force transmitting means connected to the output shaft of the engine to rotationally drive the generator; and a first driving force transmitting means connected to the drive shaft of the generator to rotationally drive the pressure wave supercharger. 2
a driving force transmitting means; a reducing means for reducing the load on the pressure wave supercharger in the generator when the first driving force transmitting means loses the ability to transmit the driving force; and the pressure wave supercharging. 1. A supercharger drive device for an engine, characterized in that the supercharger drive device for an engine is equipped with a maintenance means for maintaining the rotary drive state by the exhaust pressure of exhaust gas. (2) The reducing means includes a one-way clutch that transmits power from the generator to the pressure wave supercharger and does not transmit power from the pressure wave supercharger to the generator. 1. A supercharger drive device for the engine according to 1.