JP4168343B2 - Auxiliary drive engine starter - Google Patents

Description

  The present invention relates to an accessory-driven engine starter that can independently execute accessory drive and engine start. The accessory-driven engine starter of the present invention is applied to an accessory-driven engine starter that starts an engine by an electric compressor driven by a battery when the engine is stopped, for example.

  In recent years, since it is necessary to improve the fuel consumption of an internal combustion engine, it has an idle stop system that stops the internal combustion engine (engine) when the vehicle stops and an electric motor in addition to the engine. Hybrid drive systems that run by force have been put into practical use. In these systems, it is usual to provide an electric motor that operates a compressor for an air conditioner by battery power when the engine is stopped.

  In Patent Document 1 below, one end of a rotating shaft of a compressor driving motor is connected to an engine via a first clutch, and the other end of the rotating shaft of the compressor driving motor is connected to an air conditioner compressor via a second clutch. By doing so, it is proposed that the air conditioner compressor can be electrically driven even when the engine is stopped, and the engine is started by the compressor drive motor.

Patent Document 2 below discloses that a compressor driving motor for driving an air conditioner compressor is connected to an engine via an electromagnetic clutch so that the air conditioner compressor is electrically operated when the electromagnetic clutch is off, and the compressor driving motor is operated when the electromagnetic clutch is on. Has proposed an electric motor device for driving a compressor that starts the engine.
JP 2001-298803 A JP 2002-205536 A

  However, in the apparatus of the above publication, since the motor, the auxiliary machine, and the clutch mechanism for controlling the connection state thereof are arranged in a line in the axial direction, the axial length of the apparatus is the sum of the axial lengths of the respective apparatuses. As a result, the mountability in the engine room is significantly reduced. Reduction in the volume of the engine room is a major factor in vehicle design, and it has been difficult to practically adopt a scheme for accommodating such a long system in the vicinity of the engine.

  In addition, the clutch mechanism for disconnecting the auxiliary machine in the mode for exclusive use of the motor for the engine and for disconnecting the torque transmission system to the engine in the mode for exclusive use of the auxiliary motor for the motor becomes complicated and expensive. There were few merits compared with the case where the auxiliary machine was driven by a dedicated motor.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and improves the vehicle mountability of an electric auxiliary device capable of starting an engine and facilitates accommodation in the vicinity of the engine. The purpose is to provide.

The auxiliary drive type engine starter of the present invention made to solve the above problems is arranged between an electric motor for starting an engine, an auxiliary machine driven by the electric motor, and the electric motor and the engine. In an auxiliary machine drive type engine starter comprising an engine drive joint mechanism, and an auxiliary machine drive joint mechanism disposed between the electric motor and the auxiliary machine,
The engine drive joint mechanism and the auxiliary machine drive joint mechanism are formed of one-way clutches whose joint directions are opposite to each other, and the electric motor rotates in a direction opposite to that when the engine is driven when the auxiliary machine is driven. Therefore, it is possible to simplify the splicing mechanism that needs to be added compared to the case of using a plurality of electric motors, and to fully take advantage of the reduction in size and weight by saving the number of electric motors. In addition, the one-way clutch as an engine drive coupling mechanism or an auxiliary machine coupling mechanism has a much simpler configuration than other types of clutch mechanisms, and is also the radially inner side or radial direction of various rotating bodies. Since it can be coaxially arranged outside, an increase in the axial length of the apparatus can be suppressed.

In the present invention, the speed reduction mechanism is provided on one end side of the rotating shaft of the electric motor, having an input rotating shaft to which the rotating force is input from the electric motor and an output rotating shaft that outputs the rotating force to the engine side. The engine drive coupling mechanism is disposed between the input rotation shaft of the speed reduction mechanism and the electric motor. As a result, the electric motor can drive the engine with a low rotation and a large torque even when the auxiliary device is driven with a high rotation and a small torque, and it is possible to satisfactorily achieve both the driving of the auxiliary machine and the engine start with a single electric motor. it can.

Furthermore, in the present invention, the output rotation shaft of the speed reduction mechanism is connected to the pulley through a pulley clutch that is a joint mechanism. As a result, the speed reduction mechanism is not always driven by the engine during normal rotation of the engine, and wear and power loss can be reduced.
The pulley clutch is an electromagnetic clutch. This can prevent wear of the pulley clutch as well as the speed reduction mechanism during normal rotation of the engine.

In a preferred aspect 1, the auxiliary machine is composed of an air conditioning compressor. In normal use, the driving of the air conditioning compressor and the engine start are never performed at the same time, so the engine drive joint mechanism and the auxiliary machine joint mechanism are provided by two one-way clutches having opposite joint directions. Even if it comprises, the demerit in use does not generate | occur | produce.
In the preferred aspect 2 , since the speed reduction mechanism is a planetary speed reduction mechanism, the speed reduction mechanism is small and can provide a sufficient speed reduction ratio.

In a preferred aspect 3 , when the engine is started by the electric motor, the electromagnetic clutch is engaged after a predetermined period from the start of rotation of the electric motor in the engine driving direction. Thereby, engine starting can be started using the inertial rotation energy of an electric motor.

In the preferred embodiment 4 , when the motor is driving the auxiliary machine when the engine is started by the motor, the motor is stopped once, and then the drive in the reverse direction is started. It can be performed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an auxiliary drive type engine starter according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to this embodiment. For example, an electric motor (motor) for starting the engine may be operated as a generator driven by the engine.
(Example 1)
FIG. 1 shows a schematic block diagram of an accessory-driven engine starter according to the first embodiment.

  The auxiliary drive type engine starter A includes a pulley 1, an electromagnetic clutch 2, a speed reduction mechanism 3, a one-way clutch 4, an electric motor 5, a one-way clutch 6, and a compressor 7 for an air conditioner. The electromagnetic clutch 2 is disposed between the pulley 1 and the speed reduction mechanism 3, the one-way clutch 4 is disposed between the speed reduction mechanism 3 and the electric motor 5, and the one-way clutch 6 is disposed between the electric motor 5 and the compressor 7. The torque transmission direction of the clutches 4 and 6 is shown by arrows in FIG.

  Reference numeral 8 denotes an engine, and a crank pulley 9 of the engine 8 is connected to the pulley 1 by a belt 10. Reference numeral 11 denotes a battery that feeds power to an inverter 13 controlled by the control device 12. The inverter 13 converts DC power received from the battery 11 into, for example, three-phase AC power, feeds the motor 5, and drives the motor 5. .

  The speed reduction mechanism 3 is a planetary speed reduction mechanism, and includes a rotating shaft 31 protruding toward the electric motor 5, a sun gear 32 attached to the rotating shaft 31, an internal gear 33 fixed to a housing (not shown), a sun gear 32, and an internal gear. A planetary gear 34 that meshes with the planetary gear 33 and rotates on the planetary gear 34, and a carrier 35 that protrudes toward the speed reduction mechanism 3 and supports the planetary gear 34 so as to rotate freely. Accordingly, the electromagnetic clutch 2 is disposed between the pulley 1 and the carrier 35, and the one-way clutch 4 is disposed between the rotating shaft 31 and the electric motor 5.

The operation of this auxiliary drive type engine starter A will be described below.
[Engine starting operation]
When the electric motor 5 is rotated in one direction (for example, clockwise), the rotational force, that is, torque, is input to the speed reduction mechanism 3 through the one-way clutch 4, and the electromagnetic clutch 2 is engaged after a predetermined time delay from the start of rotation of the electric motor 5. The multiplied rotational force is transmitted to the crank pulley 9 through the pulley 1 and the belt 10, and the engine 8 is started. At this time, the one-way clutch 6 is in an open state, and the electric motor 5 does not drive the compressor 7 when the engine is started. When power transmission to the electric motor 5 is stopped after the engine start is completed, the engine 8 tries to drive the electric motor 5 through the pulley 1, the electromagnetic clutch 2, the speed reduction mechanism 3, and the one-way clutch 4, but the electromagnetic clutch 2 is in an open state. Therefore, the reduction mechanism 3 and the electric motor 5 are driven and the electric motor 5 is prevented from overrunning.
[Electric compressor operation]
When the motor 5 is rotated in the other direction (for example, counterclockwise) when the engine is stopped, the rotational force, that is, torque is transmitted to the compressor 7 through the one-way clutch 6, and the compressor 7 is electrically driven. At this time, the one-way clutch 4 is opened because the rotation direction is opposite to the torque transmission direction, and the electric motor 5 does not drive the speed reduction mechanism 3 and the engine. Also, when the compressor 7 is electrically driven during engine rotation, the electric motor 5 and the compressor 7 can be operated independently of the engine 8 by opening the electromagnetic clutch 2.
[Engine start-up operation from auxiliary drive state]
In order to start the engine while the compressor 7 is driven by the electric motor 5 described above, the electric motor 5 is first stopped, and then the electric motor 5 is rotated in the reverse direction to perform the engine starting operation described above.
(Modification)
In the above-described embodiment, the electromagnetic clutch 2 and the one-way clutch 4 are individually provided on both sides of the speed reduction mechanism 3 between the electric motor 5 and the engine 8. As a result, when the engine 8 tries to drive the electric motor 5 after the start of the engine 8 is completed, the electromagnetic clutch 2 is released to prevent the speed reduction mechanism 3 from rotating, and the electric motor 5 drives the compressor 7. The one-way clutch 4 can be released to prevent the speed reduction mechanism 3 from rotating. Therefore, the speed reduction mechanism 3 is driven during normal engine rotation and during operation of the electric compressor, and problems such as unnecessary friction loss, wear, and heat generation do not occur. Of course, either the electromagnetic clutch 2 or the one-way clutch 4, for example, the one-way clutch 4 can be omitted.
(Modification)
In the above embodiment, the internal gear 33 is fixed to a housing (not shown). However, the internal gear 33 may be fixed to the housing through a one-way clutch (referred to as a one-way clutch with an internal gear). . In this case, the electromagnetic clutch 2 or 4 can be omitted.

That is, the motor 5 rotates, for example, clockwise, the one-way clutch 6 is released, the one-way clutch with an internal gear is engaged and fixed to the housing, and the torque of the motor 5 is reduced to the speed reduction mechanism 3 and the pulley. 1 to the engine 8. For example, the electric motor 5 rotates counterclockwise, and the one-way clutch 6 is engaged, and the electric motor 5 drives the compressor 7. At this time, the internal gear 33 is in an idle state, so the pulley 1 is not driven.
(Example 2)
FIG. 2 shows a schematic block diagram of an accessory-driven engine starter according to the second embodiment.

  This auxiliary machine drive type engine starter B has an auxiliary gear drive type engine starter A shown in FIG. 1 fixed to a housing (not shown) for rotating the planetary gear 34 so as to rotate freely. It is connected to the pulley 1 through the electromagnetic clutch 2. A bearing 36 is supported by the housing and rotatably supports the rotary shaft 35.

The operation of the auxiliary drive type engine starter B is essentially the same as that of the auxiliary drive type engine starter A shown in FIG. 1 except for the speed reduction ratio of the speed reduction mechanism 3.
(Modification)
In the above embodiment, the rotating shaft 35 that rotatably supports the planetary gear 34 is fixed to the housing. However, the planetary gear 34 is rotated through a one-way clutch (referred to as a one-way clutch with a planetary gear). It may be locked to the housing. In this case, the electromagnetic clutch 2 or the one-way clutch 4 can be omitted.

That is, the motor 5 rotates, for example, clockwise, the one-way clutch 6 is released, the one-way clutch with planetary gears is engaged and fixed to the housing, and the torque of the motor 5 is reduced by the speed reduction mechanism 3 and the pulley 1. Is transmitted to the engine 8 through When the electric motor 5 rotates, for example, counterclockwise, the one-way clutch 6 is engaged and the electric motor 5 drives the compressor 7. At this time, since the rotating shaft 35 is in an idle state when the one-way clutch with the planetary gear is released, the pulley 1 is not driven.
(Example effect)
According to the auxiliary drive type engine starting device of the embodiment described above, the following effects can be obtained.

  Since the drive of the compressor 7 and the engine start are switched by switching the rotation direction of the electric motor 5, the separation of the compressor 7 from the electric motor 5 at the time of engine start can be realized by a simple one-way clutch 6, and at the time of driving the compressor Separation between the electric motor 5 and the engine 8 can be realized by the simple electromagnetic clutch 2 or the one-way clutch 4. After all, according to this embodiment, the motor 5 is provided with the two clutches 2 or 4 and the one-way clutch 6 by utilizing the fact that the engine start and the compressor driving need not be performed simultaneously. The engine can be started by reducing the number of parts and the overall weight and physique can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram showing a first embodiment of an accessory-driven engine starter of the present invention. It is a schematic block diagram which shows Example 2 of this invention auxiliary machine drive type engine starting apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pulley 2 Electromagnetic clutch 3 Deceleration mechanism 4 One-way clutch 5 Electric motor 6 One-way clutch 7 Compressor 8 Engine 9 Crank pulley 10 Belt 11 Battery 12 Controller 13 Inverter 16 Pulley nut 17 Stator 19 Pulley part (pulley)
31 Rotating shaft 32 Sun gear 33 Internal gear 34 Planetary gear 35 Carrier

Claims (4)

An electric motor for starting the engine;
An auxiliary machine driven by the electric motor;
An engine drive joint mechanism disposed between the electric motor and the engine;
Auxiliary drive coupling mechanism disposed between the electric motor and the auxiliary machine,
In an auxiliary drive type engine starter comprising:
The engine driving joint mechanism and the accessory driving joint mechanism are:
Consists of one-way clutches whose joint directions are opposite to each other,
The motor is
When the auxiliary machine is driven, it rotates in the opposite direction to that when the engine is driven.
A reduction mechanism disposed on one end side of the rotating shaft of the motor, having an input rotating shaft to which the rotating force is input from the motor and an output rotating shaft that outputs the rotating force to the engine side;
The engine drive joint mechanism is disposed between the input rotary shaft of the speed reduction mechanism and the electric motor,
Output rotating shaft of the speed reduction mechanism is connected to the pulley through the pulley clutch is joint engagement mechanism,
The pulley clutch is an accessory-driven engine starter comprising an electromagnetic clutch . In the auxiliary drive type engine starter according to claim 1,
The reduction mechanism, the accessory drive type engine starting equipment consisting of a planetary reduction gear mechanism. The auxiliary machine drive type engine starter according to claim 1 or 2 ,
An accessory-driven engine starter that engages the electromagnetic clutch with a predetermined time delay from the start of rotation of the motor in the engine drive direction when the engine is started by the motor. The auxiliary drive type engine starter according to any one of claims 1 to 3 ,
An auxiliary machine drive type engine starting device that stops the electric motor once and then starts driving in the reverse direction when the electric motor drives the auxiliary machine when the engine is started by the electric motor.

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