JPH07259710A - Starter generator for vehicle - Google Patents

Abstract

PURPOSE:To secure required torque at the time of engine starting in the starter generator, and also secure a revolution speed for power generation. CONSTITUTION:The device is provided with a starter generator 2 which starts an engine, while supplying electricpower by being driven by the engine started, and with a pulley 3 coaxially and rotatably supported on the outer circumference of the rotor shaft 20 of the starter generator 2. The device is also provided with an one-way clutch 7 which couplers the rotor shaft 20 with the pulley 3 when the revolution of the pulley 3 exceeds the revolution of the rotor 20 by the aforesaid constitution, a planetary gear 5 interposed between the inner circumference of the pulley 3 and the rotor shaft 20, an one-way clutch 8 cutting off motive power from the pulley 3 to the planetary gear 5 when the revolution of the pulley 3 exceeds the revolution of the rotor shaft 20, and with a belt connecting an engine drive shaft to the pulley 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vehicle starter / generator.

[0002]

2. Description of the Related Art Vehicles such as automobiles have conventionally been widely provided with a starter motor for starting an engine and a generator for supplying electric power to the vehicle, and the starter motor and the generator and the engine are connected by a belt. Has been adopted.

In a small car or the like, there is a case where the auxiliary equipment mounting space in the engine room may be insufficient.
No. 27168, in which a starter motor is arranged close to an engine,
As disclosed in Japanese Laid-Open Patent Publication No. 25, there is known one that secures a space in an engine room by connecting a generator and an engine through a gear.

Since these configurations still require the starter motor and the generator, respectively, as disclosed in Japanese Patent Publication No. 2-43029, the starter can be selectively switched as the starter motor or the generator. It is known to reduce the weight of a vehicle by omitting a motor.

[0005]

However, when the retarder is used as both the starter motor and the generator as in the latter case, it is necessary to set the retarder according to the torque required as the starter motor. In some cases, using a retarder as a generator reduced the power generation efficiency.

It is therefore an object of the present invention to provide a vehicle starter / generator capable of suppressing a decrease in power generation efficiency and ensuring a required amount of power generation and a torque required for starting.

[0007]

A first aspect of the present invention is directed to a vehicle starter / generator which is driven by the engine after starting to supply electric power while starting the engine, and a rotor shaft of the starter / generator. A rotating member coaxially supported on the outer periphery, a first clutch connecting the rotor shaft and the rotating member when the rotating speed of the rotating member exceeds the rotating speed of the rotor shaft, and an inner periphery of the rotating member. A speed reducer interposed between the rotor shaft and the rotor shaft; a second clutch for cutting off power from the rotary member to the speed reducer when the rotational speed of the rotary member exceeds a predetermined rotational speed; A rotation transmission means that connects the drive shaft and the rotating member is provided.

In a second aspect based on the first aspect, the speed reducing means includes a ring gear disposed on the inner circumference of the rotating member, a sun gear formed on the rotor shaft, a ring gear and a sun gear. And a planet gear interposed therebetween, and the second clutch is interposed between the ring gear and the rotating member.

In a third aspect based on the second aspect, the means for selectively restricting the revolution of the planet gear, the means for measuring the current applied to the starter / generator, and the measured current have a predetermined value. Between the above, the control means drives the regulating means.

[0010]

Therefore, according to the first aspect of the present invention, when the engine is started, the driving force of the starter / generator is transmitted from the rotor shaft to the rotating member via the speed reducing means and the second clutch, and the rotation transmitting means further causes the engine to be driven. Cranking is performed, and the starter / generator can drive the engine with a torque according to the speed reduction ratio of the speed reducer. On the other hand, when the engine starts and the number of rotations of the rotating member reaches a predetermined number of rotations, the second clutch is disengaged and the speed reducing means and the rotating member can be displaced relative to each other. When the number exceeds the limit, the first clutch is actuated to connect the rotary member and the rotor shaft, and the starter / generator is driven by the engine.

According to a second aspect of the present invention, the start of the engine by the starter / generator is transmitted from the sun gear formed on the rotor shaft to the ring gear via a planet gear interposed between the ring gear and the sun gear, and The rotary member is driven from the ring gear via the second clutch. on the other hand,
When the engine starts and the number of rotations of the rotating member reaches a predetermined number of rotations, the second clutch is disengaged and the planetary gear and the rotating member can be displaced relative to each other, and the number of rotations of the rotating member exceeds the number of rotations of the rotor shaft. The first clutch is actuated to connect the rotating member and the rotor shaft, and the starter / generator is driven by the engine as a generator.

In a third aspect of the present invention, when the engine is started by the starter / generator, the restricting means is actuated to restrict the revolution of the planet gear, and the ring gear is decelerated by the planet gear from the sun gear formed on the rotor shaft. Then, the rotating member is driven through the second clutch via the clutch to crank the engine. On the other hand, when the engine starts, the current flowing in the no-load starter / generator decreases, and when the rotation speed of the rotating member exceeds a predetermined rotation speed, the current measured by the current measuring means becomes less than the predetermined value, and the control is performed. Since the means stops the operation of the regulating means, the planet gear can revolve around the sun gear, and the starter / generator is connected to the rotor shaft and the rotating member via the first clutch to drive the engine as a generator. To be done.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 5 show that the engine 1 is started, and after the engine 1 is started, the starter / generator 2 that charges the battery 91 via the controller 9 and supplies electric power to an electric circuit (not shown) is used. 1, the starter / generator 2 is composed of, for example, a three-phase AC generator.

The starter / generator 2 and the engine 1 are connected to each other via a crank pulley 11, a belt 12 and a pulley 3 as rotation transmitting means.

As shown in FIG. 2, the pulley 3 provided as a rotating member is formed of a cylindrical member having a bottom portion 3A, and the bottom portion 3A of the pulley 3 covers the rotor shaft 20 so that the end portion of the rotor shaft 20 is covered. The bottom part 3A
Is the bearing 2 at the end of the rotor shaft 20 of the starter / generator 2.
1 is rotatably supported, and the pulley 3 is rotatably supported with respect to the rotor shaft 20. The outer diameter of the pulley 3 is set so as to have a predetermined reduction ratio with the crank pulley 11 so as to be within a predetermined speed range when the starter / generator 2 is driven as a generator.

On the inner circumference of the pulley 3 facing the bottom portion 3A, a drive disk 4 formed of a disk-shaped member is provided on the rotor shaft 20.
Be combined with.

The outer diameter of this drive disk 4 is the pulley 3
Is set so as to form a predetermined gap with the inner diameter of the drive disk 4, and at a predetermined position on the outer periphery of the drive disk 4, as shown in FIG.
A wedge-shaped groove portion 71 that constitutes the one-way clutch 7 as the first clutch is formed.

The groove portion 71 is constructed so as to gradually decrease in depth from a predetermined depth to the outer diameter of the drive disk 4 on the circumference along a predetermined rotation direction. However, the rotation directions of the drive disk 4 and the pulley 3 are as shown in FIG.
It is the same clockwise as the crank pulley 11.

A one-way clutch 7 formed of a round bar member as a first clutch is housed in the groove portion 71.
The one-way clutch 7 is constantly urged toward the pulley 3 by a spring 70 provided on the drive disk 4 side and is in sliding contact therewith.

The rotation speed of the drive disk 4 (that is,
When the rotation speed of the pulley 3 becomes larger than the rotation speed of the rotor shaft 20, the one-way clutch 7 is sandwiched between the groove portion 71 and the inner circumference of the pulley 3 to connect the pulley 3 and the drive disk 4, while the rotation of the rotor shaft 20. When the number of rotations of the pulley 3 is smaller than the number, the one-way clutch 7 slides on the inner circumference of the pulley 3 to allow relative displacement between the pulley 3 and the drive disk 4.

A planetary gear 5 as a speed reducing means is arranged on the starter / generator 2 side of the rotor shaft 20 to which the drive disk 4 is connected at the inner circumference of the pulley 3.

As shown in FIGS. 2 and 4, this planetary gear 5 has an outer diameter capable of forming a predetermined gap with the inner circumference of the pulley 3 while coupling a sun gear 51 coaxially with the rotor shaft 20. A ring gear 50 having a predetermined number of teeth on the inner circumference is arranged on the outer circumference of the sun gear 51 and on the inner circumference of the pulley 3.

A planet gear 52 meshing with the sun gear 51 and a planet gear 53 meshing with the ring gear 50 are arranged between the ring gear 50 and the sun gear 51, respectively, and these planet gears 52, 53 mesh with each other. .

The planet gears 52, 53 are rotatably supported by the rotor shaft 20 via the bearings 22 and the carrier plate 60 disposed at a position facing the end face of the starter / generator 2 shaft. The carrier plate 60 is supported by an electromagnetic clutch 6, which will be described later, by suction and fixing, thereby restricting the revolution of the planet gears 52 and 53 to reduce the rotation of the sun gear 51 at a predetermined reduction ratio and transmit the rotation to the ring gear 50. Two planet gears 52,
The rotation of the rotor shaft 20 and the ring gear 50 can be driven in the same direction by 53. The reduction ratio is set according to the required torque at the time of starting the engine 1.

As shown in FIG. 4, a wedge-shaped groove portion 81 which constitutes the one-way clutch 8 as a second clutch is formed at a predetermined position on the outer circumference of the ring gear 50. The groove portion 81 is configured to gradually increase the depth from the outer diameter of the ring gear 50 to a predetermined depth on the circumference along the predetermined rotation direction.

A one-way clutch 8 formed of a round bar member as a second clutch is housed in the groove portion 81.
The one-way clutch 8 is constantly urged toward the inner circumference of the pulley 3 by a spring 80 provided on the ring gear 50 side and is in sliding contact therewith.

When the rotation speed of the ring gear 50 becomes higher than the rotation speed of the pulley 3, the one-way clutch 8 has a groove portion 81.
The pulley 3 and the ring gear 50 are connected by being sandwiched between the pulley 3 and the inner circumference of the pulley 3, while in the other case, the one-way clutch 8 is slidably contacted with the inner circumference of the pulley 3 and the pulley 3 and the ring gear 50 are relatively opposed to each other. Allow displacement.

An electromagnetic clutch 6 as a means for selectively restricting the revolution of the planet gears 52, 53 is arranged on the end face of the starter / generator 2 facing the carrier plate 60 pivotally supported by the rotor shaft 20. .

The electromagnetic clutch 6 is driven by the controller 9, and when the electromagnetic clutch 6 is excited, the carrier plate 60 supported by the rotor shaft 20 is attracted to the electromagnetic clutch 6 and restricts the revolution of the planet gears 52, 53. Therefore, the rotation speed of the rotor shaft 20 is reduced and transmitted to the ring gear 50.

On the other hand, in the non-excited state of the electromagnetic clutch 6,
Since the carrier plate 60 is rotatable with respect to the rotor shaft 20, the planet gears 52 and 53 and the ring gear 50 are
Can rotate integrally with the sun gear 51.

Here, the control of the electromagnetic clutch 6 by the controller 9 is started based on a signal from the ignition key 92.

The controller 9 has an inverter and a voltage regulator (not shown) inside. The controller 9 drives the starter / generator 2 via the battery 91 and the inverter when the engine 1 is started, and a current measuring means (not shown) also provided inside. Controls the electromagnetic clutch 6 on the basis of the drive current of the starter / generator 2 while releasing the excitation of the electromagnetic clutch 6 after starting the engine 1 to supply power to the battery 91 via the starter / generator 2 and the voltage regulator. To supply.

An example of control by the controller 9 will be described in detail with reference to the flowchart of FIG.

After confirming that the ignition key 92 is turned on in step S0, the controller 9 is initialized in step S1, and then it is determined in step S2 whether the ignition key 92 is at the start position. If it is the start position, the connection between the battery 91 and the starter / generator 2 is switched to the electric motor in step S3, and the starter / generator 2 is driven as an electric motor via an inverter (not shown).

In step S4, the electromagnetic clutch 6 is excited and the carrier plate 60 is attracted and locked, and the revolutions of the planet gears 52 and 53 are restricted. In FIG. 4, the rotation of the starter / motor 2 operating as an electric motor is performed. The sun gear 51 coaxially coupled to the rotor shaft 20 is rotated by this, and the ring gear 50 is driven at a predetermined reduction ratio via the planet gears 52 and 53 whose revolution is restricted by the electromagnetic clutch 6.

At this time, the ring gear 50 starts to rotate before the pulley 3 which has stopped together with the engine 1, so that the one-way clutch 8 has a groove portion 81 because the rotation speed of the ring gear 50 is larger than that of the pulley 3. Pulley 3
The ring gear 50 and the pulley 3 are connected by being sandwiched between the inner periphery of the engine 3 and the pulley 3. The pulley 3 is driven by the starter / motor 2 and starts cranking the engine 1 via the belt 12 and the crank pulley 11.

The pulley 3 is a planetary gear 5 and the rotor shaft 2
By reducing the rotational speed of 0, the torque required for starting the engine 1 can be obtained, and the engine 1 can be smoothly started by the start-up / motor 2.

On the other hand, as shown in FIG. 3, the starter / generator 2
Since the rotational speed of the rotor shaft 20 is higher than that of the pulley 3 in accordance with the reduction ratio of the planetary gear 5 while the motor is driven as an electric motor, the one-way clutch 7 is released by sliding contact with the inner circumference of the pulley 3. The relative displacement between the drive disk 4 and the pulley 3 is allowed.

During cranking of the engine 1 by the start-up / motor 2, the drive current of the start-up / generator 2 is measured in step S5, and the start-up of the engine 1 in which the drive current is less than a predetermined value is completed in step S6. To judge.

At the end of starting the engine 1, the idle speed of the engine 1 becomes higher than the speed of the ring gear 50. Therefore, in FIG. 4, the pulley 3 starts rotating clockwise with respect to the ring gear 50, and the one-way clutch 8 operates. It will be canceled.

At this time, the starter / generator 2, which is driven as an electric motor, becomes unloaded when the number of revolutions exceeds a predetermined value, and the drive current from the battery 91 decreases, and a current measuring means provided inside the controller 9 is provided. When the measured value is less than the predetermined value, it is determined that the engine 1 has started.

Thus, after the engine 1 is started, the electromagnetic clutch 6 is deenergized in step S7 to allow the planet gears 52 and 53 to revolve around the sun gear 51 and shut off the power to the ring gear 50.

The one-way clutch 8 interposed between the planetary gear 5 and the pulley 3 is released due to the increase in the rotation speed of the engine 1 because the rotation speed of the pulley 3 becomes larger than the rotation speed of the ring gear 50, and the ring gear 50 and the pulley 3 are released. Three
Relative displacement is started.

In step S8, the connection between the battery 91 and the starter / generator 2 is switched from an inverter (not shown) to a voltage regulator to terminate the supply of electric power to the starter / generator 2 while the starter / generator 2 is being supplied. The electric power can be adjusted to a predetermined voltage and supplied to the battery 91.

When the power supply to the starter / generator 2 is cut off, the rotational speed of the rotor shaft 20 rotating at the cranking speed of the engine 1 decreases according to the speed reduction ratio of the planetary gears 5, while the speed of the started engine increases. Pulley 3 driven to 1
Rotates at a predetermined idle speed or more, and when the rotation speed of the rotor shaft 20 becomes lower than the rotation speed of the pulley 3, the one-way clutch 7 shown in FIG. 3 operates to drive the rotor shaft 20 and the pulley via the drive disk 4. 3 are combined.

The starter / generator 2 is directly driven by the engine 1 via the pulley 3 and the drive disk 4 so that the rotation speed of the pulley 3 and the rotation speed of the rotor shaft 20 are the same, and the outer diameters of the pulley 3 and the crank pulley 11 are the same. Is set to a predetermined ratio, the starter / motor 2 can be operated in a speed range suitable as a generator, and a predetermined power generation capacity can be secured.

As described above, by executing steps S0 to S8 at the time of starting the engine 1, it is possible to automatically switch from the starter to the generator on the basis of the drive current of the starting / motor 2 and the start of the engine 1. Sometimes the engine 1 is cranked with a predetermined torque by the starter / motor 2 that is decelerated by the planetary gear 5 via the one-way clutch 8, while after the engine 1 is started, the engine 1 is started up with a predetermined speed via the one-way clutch 7. By driving 2, it is possible to secure a certain power generation capacity,
By setting the reduction ratio of the planetary gear 5 according to the torque required for cranking the engine 1, and setting the ratio of the outer diameters of the pulley 3 and the crank pulley 11 to the required speed of the starter / motor 2 as a generator. , It is possible to secure the torque required for cranking without lowering the power generation efficiency, and one starter / motor 2 can efficiently use both the starter and the generator, and the conventional starter motor is unnecessary. Thus, it is possible to promote the miniaturization and weight reduction of the vehicle.

FIG. 7 shows another embodiment, in which the gear carrier 60 in the first embodiment is fixed to the end surface of the starter / generator 2 and the electromagnetic clutch 6 is eliminated.
The other structure is similar to that of the first embodiment.

In FIG. 7, planet gears 52, 53
A gear carrier 61 that axially supports is fixed to the end surface of the starter / generator 2 and constantly drives the ring gear 50 to decelerate according to the rotation of the rotor shaft 20.

After the engine 1 is started, the one-way clutch 8 is disengaged and the relative displacement between the ring gear 50 and the pulley 3 is allowed as in the first embodiment, and the ring gear 50 has the reduction ratio of the planetary gear 5 at the inner circumference of the pulley 3. The controller 9 shown in the above FIG. 6 only spins at a corresponding speed.
Of the control contents, the control of the electromagnetic clutch 6 in steps S4 and S7 is unnecessary, and a simpler configuration can be achieved.

[0052]

As described above, according to the first aspect of the present invention, while the engine is started, the vehicle starter / generator for supplying electric power by being driven by the engine after starting, and the rotor of the starter / generator. A rotating member coaxially supported on the outer periphery of the shaft, and a first clutch that connects the rotor shaft and the rotating member when the rotating speed of the rotating member exceeds the rotating speed of the rotor shaft,
A speed reducer interposed between the inner circumference of the rotating member and the rotor shaft; and a means for shutting off power from the rotating member to the speed reducing unit when the rotating speed of the rotating member exceeds a predetermined rotating speed. No. 2 clutch and rotation transmission means for connecting the drive shaft of the engine and the rotating member, and the reduction ratio of the reduction means is set according to the torque required for cranking the engine, while the rotation transmission means is decelerated. The ratio can be set according to the power generation efficiency of the starter / generator, and the drive torque can be secured without impairing the power generation efficiency.

In a second aspect based on the first aspect, the speed reducing means includes a ring gear disposed on the inner periphery of the rotating member, a sun gear formed on the rotor shaft, a ring gear and a sun gear. Since the second clutch is interposed between the ring gear and the rotating member, the ratio of the sun gear to the ring gear is set according to the torque required for engine cranking. On the other hand, the speed reduction ratio of the rotation transmission means can be set in accordance with the power generation efficiency of the starter / generator, and the drive torque can be secured without impairing the power generation efficiency.

The third invention, in the second invention, further comprises means for selectively restricting the revolution of the planet gear, and means for measuring a current applied to the starter / generator.
While the measured current is equal to or more than a predetermined value, the control means for driving the regulating means is provided, and the ratio between the sun gear and the ring gear is set according to the torque required for cranking the engine, while the reduction ratio of the rotation transmission means is set. It can be set according to the power generation efficiency of the starter / generator, and it becomes possible to secure the drive torque without impairing the power generation efficiency. Furthermore, the start of the engine can be determined by the current measuring means, It is possible to automatically switch the combined generator from the starter to the generator.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a planetary gear housed in a pulley.

FIG. 3 is a sectional view taken along the arrow B in FIG.

FIG. 4 is a sectional view taken along arrow C of FIG.

5 is a view on arrow AA in FIG. 1. FIG.

FIG. 6 is a flowchart showing the contents of control in the controller.

FIG. 7 is a sectional view of a pulley showing another embodiment.

[Explanation of symbols]

 2 Starter / generator 3 Pulley 4 Drive disk 5 Planetary gear 6 Electromagnetic clutch 7 One-way clutch 8 One-way clutch 9 Controller 11 Crank pulley 20 Rotor shaft 50 Ring gear 51 Sun gear 52, 53 Planet gear 60 Carrier plate

Claims (3)

[Claims] 1. A starter / generator for a vehicle, which is driven by the engine after starting and supplies electric power to the engine, and a rotation coaxially supported by an outer periphery of a rotor shaft of the starter / generator. A member, a first clutch that connects the rotor shaft and the rotating member when the rotating speed of the rotating member exceeds the rotating speed of the rotor shaft, and is interposed between the inner circumference of the rotating member and the rotor shaft. A speed reducer, a second clutch that shuts off power from the rotary member to the speed reducer when the rotational speed of the rotary member exceeds a predetermined speed, and a drive shaft of the engine and the rotary member are connected to each other. A starter / generator for a vehicle, comprising: a rotation transmission means. 2. The speed reducing means includes a ring gear arranged on the inner circumference of the rotating member, a sun gear formed on a rotor shaft, and a planet gear interposed between the ring gear and the sun gear. The vehicle starter / generator according to claim 1, wherein the second clutch is interposed between the ring gear and the rotating member. 3. A means for selectively restricting the revolution of the planet gears, a means for measuring a current applied to a starter / generator, and a control means for driving the restriction means while the measured current is a predetermined value or more. The starting and power-generating device for a vehicle according to claim 2, comprising: