JP2015129518A - Start system for combustion engine of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a start system, which is more cost-effective than the known system.SOLUTION: A drive mechanism 1 comprises an engine 3; and a start system 5 which has an output member 7 that is connected to a crankshaft 9 of the engine 3. The start system 5 further includes: a flywheel 11; and connecting means connecting the flywheel 11 to the output member 7. The connecting means comprises a clutch 13; and a gear reduction 15. The start system 5 further comprises a drive source 17 formed by an electromotor which is directly connected to the flywheel 11 or which is connected to the connecting means between the clutch 13 and the flywheel 11. The maximum power that can be delivered by the drive source 17 is just sufficient to maintain the flywheel 11 at the proper r.p.m. If the drive source 17 is turned on, it thus delivers just sufficient power to maintain the flywheel 11 at the proper r.p.m. The maximum power of the drive source 17 is, in this case, 50 W.

Description

The present invention is a starting system for an engine of a vehicle, an output member that can be connected to the crankshaft of the engine, a flywheel, a connecting means that connects the flywheel to the output member and includes a clutch, And a drive source connected to the flywheel.

  This type of starting system is known (see, for example, Patent Document 1). In this starting system, the drive source is configured as an electric starting motor permanently connected to the output member. The clutch is located between the starting motor and the flywheel.

Japanese Unexamined Patent Publication No. 57-159956

  The object of the present invention is to provide a starting system of the kind described at the beginning which is more cost-effective than existing systems.

  To achieve the above object, the starting system according to the present invention is such that the driving source is connected to the flywheel or between the clutch and the flywheel, the flywheel is connected to the connecting means, and the driving means is turned on. In some cases, the output is sufficient to cause the flywheel to maintain its speed.

  The maximum power that can be delivered by the drive source should preferably be just enough for the flywheel to maintain its speed. For this reason, the maximum output of the drive source is 500 W at maximum, and more preferably 50 W.

  In one embodiment of the starting system according to the present invention, the connecting means further includes a reduction gear located between the output member and the clutch.

  In a further embodiment of the starting system according to the invention, the connecting means further comprises a further reduction gear located between the flywheel and the clutch.

  In a further embodiment of the starting system according to the invention, the flywheel clutch or freewheel bearing is arranged in parallel with the clutch and the reduction gear or further reduction gear.

  The clutch and the reduction gear or the further reduction gear are preferably formed by a brake and a planetary gear mechanism including at least three rotating members, the first rotating member of the planetary gear mechanism being connected to the output member and the second rotation The member is connected to the flywheel, and the third rotating member is connected to the brake.

  Furthermore, the brake is preferably formed by a drive source configured as an electric motor or by an electric motor and / or generator. The electric motor and / or generator may be an electric motor or a starter alternator (starter motor alternator). In this case, the flywheel is preferably formed by the rotor of an electric motor and / or generator, or the flywheel is connected to the rotor of an electric motor and / or generator.

  In a further embodiment of the starting system according to the invention, a further flywheel clutch or a further freewheel bearing is located between the flywheel or brake and the output member.

  In a further embodiment of the starting system according to the invention, the further brake is connected to an electric motor and / or generator or to a flywheel.

  Preferably, the brake or clutch is released in an inoperative state and is maintained in the released state by a spring or a centrifugal element.

Furthermore, preferably a further clutch is located between the clutch and the output member. This further clutch is preferably configured as a centrifugal disengagement device that disengages above a certain speed. The centrifugal disengagement device is preferably connected directly on one side to the crankshaft .

  In a further embodiment of the starting system according to the invention, the centrifugal disengagement device is combined with a clutch that can be activated actively.

The invention also relates to a drive mechanism for a vehicle including an engine and a starting system in which an output member is connected to the crankshaft of the engine.

In one embodiment of the drive mechanism according to the present invention, the engine includes a multi-belt and a pulley connected to the end of the crankshaft and carrying the multi-belt, and the output member of the starting system is at the end of the crankshaft. Connected.

In one embodiment of the drive mechanism according to the invention, the output member of the starting system is connected to a further pulley connected to the crankshaft via a multi-belt. These two belt wheels preferably cooperate with the distributor to form a further reduction gear.

In a further embodiment of the drive mechanism according to the invention, the output member of the starting system is connected to the end of the engine crankshaft via an additional pulley transmission mechanism.

Schematic which shows one Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention. Schematic which shows another Example of a drive mechanism provided with the starting system by this invention.

  In the following, the invention will be described in detail on the basis of an embodiment of a drive mechanism comprising a starting system according to the invention represented in the drawing. Here, FIGS. 1 to 12 show twelve embodiments of a drive mechanism comprising a starting system according to the present invention. In each embodiment, the same components are designated by the same reference numerals.

FIG. 1 is a schematic view of a first embodiment of a drive mechanism according to the present invention. The drive mechanism 1 includes an engine 3 and a starting system 5 having an output member 7 connected to the engine crankshaft 9. The starting system further includes a flywheel 11 and connecting means for connecting the flywheel to the output member. The connecting means includes a clutch 13 and a reduction gear 15.

  The starting system 5 further includes a drive source 17 formed by an electric motor, which is connected directly to the flywheel 11 or connected to connecting means between the clutch 13 and the flywheel 11. . The maximum power output by the drive source 17 is just enough to maintain the flywheel at the desired rotational speed. When the drive source 17 is turned on, it provides just enough output to maintain the flywheel at the desired speed. The maximum output is 50 W in this case.

  The drive source 17 may be connected to connection means between the reduction gear 15 and the output member 7. This is indicated by the broken line 18. Furthermore, a further clutch 19 may be located between this connection point and the output member.

  FIG. 2 is a schematic view of a second embodiment of the drive mechanism according to the present invention. In this drive mechanism 21, the connection means of the starting system 23 has a further reduction gear 25 positioned between the reduction gear 15 and the output member 7. The drive source 17 may be connected to a connection means between a further reduction gear and the output member. This is indicated by the broken line 27. Furthermore, a further clutch 29 may be located between this connection point and the output member.

  FIG. 3 is a schematic view of a third embodiment of the drive mechanism according to the present invention. In this drive mechanism 31, the reduction gear and clutch of the starting system 33 are formed by a brake 35 and a planetary gear mechanism 37 including at least three rotating members, and the first rotating member of the planetary gear mechanism 37 is connected to the output member 7. The second rotating member is connected to the flywheel 11, and the third rotating member is connected to the brake 35.

FIG. 4 is a schematic view of a fourth embodiment of the drive mechanism according to the present invention. The engine 3 includes a pulley 45 that conveys a distributor drive belt. The pulley 45 is connected to the end 47 of the crankshaft 9. In this drive mechanism 41, the output member 7 of the starting system 43 is connected to the end 47 of the crankshaft . In a fifth embodiment of the drive mechanism 51 according to the invention, the output member 7 of the starting system 53 is connected to a further pulley 55 connected to the pulley 45 via a distributor drive belt 57 of the engine 3 as shown in FIG. Connected. In a sixth embodiment of the drive mechanism 61 according to the invention, as shown in FIG. 6, the output member 7 of the starting system 63 is connected to the end 47 of the crankshaft 9 of the engine 3 via a further additional belt transmission mechanism 65. Connected to.

7 and 8 show seventh and eighth embodiments of drive mechanisms 71, 81 comprising starter systems 72, 82 according to the present invention. Here, the drive source is formed by an electric motor and / or generator 17 (starter alternator) connected to the ring of the planetary gear mechanism 37. The carrier of the planetary gear mechanism is connected to the crankshaft 9 of the engine 3 via the belt transmission mechanism 57. The flywheel 11 is connected to the sun gear of the planetary gear mechanism 37. The clutch 73 is located between the flywheel 11 and the output member 7. In the starting system 72 shown in FIG. 7, the flywheel 11 is connected to the brake 75, while in the starting system 82 shown in FIG. 8, the flywheel 11 is connected to the free wheel bearing 85 via the reduction gear 83. The

  The engine 3 can be started by the electric motor and / or generator 17 while the brake 75 is closed / locked. The electric motor and / or generator 17 is output driven. Torque can be supported by the brake 75 or the free wheel bearing 85 via the planetary gear mechanism 37. The advantage of this planetary torque gain is that the starting current required to start the engine 3 is small.

The starting of the engine 3 may be realized by an electric motor and / or generator 17, in which case the flywheel 11 is first brought to a certain speed by means of the electric motor and / or generator, during which the torque is transmitted to the crankshaft 9. But the crankshaft does not begin to rotate (limited torque). Subsequently, the clutch 73 may be closed, so that the flywheel 11 can transmit torque directly to the crankshaft 9. As an auxiliary role, the electric motor and / or generator 17 can be assisted (as a generator or motor) while the clutch is closed or after it is closed. The electric motor and / or generator 17 can also assist opening of the clutch 73, in which case the torque is supported by the flywheel 11 and / or the brake 75 or the freewheel bearing 85. The advantage of this starting mode is also a lower starting current (or a starting current may not be required).

  The engine 3 can also be started in other ways by an electric motor and / or generator 17. That is, the flywheel 11 is already rotating and additional torque gain is obtained via the planetary gear mechanism 37. The electric motor and / or generator 17 is first used as a generator and then as a motor if possible. Thus, the torque is supported by the flywheel 11 via the planetary gear mechanism 37. The advantage of this planetary torque gain is also a lower starting current.

Energy can be stored in the flywheel 11 by driving the electric motor and / or generator 17 as a generator. An effective choice of gear ratio allows the flywheel to be charged with a power as great as 2 to 5 times via a planetary gear mechanism. The energy stored in the flywheel comes from the crankshaft 9. At this time, the torque is supported by the flywheel 11 via the planetary gear mechanism 37. This preferably occurs during the driver's braking operation and / or when the driver releases the accelerator pedal (braking energy recovery). The advantage of the planetary gear mechanism and flywheel is the output gain, so that the output can be recovered more than a battery that is limited with respect to high power storage of energy.

  The engine 3 can be assisted by driving the electric motor and / or generator 17 as a motor. Due to the effective selection of the gear ratio, it is also possible here to emit as much as 2 to 5 times more power via the planetary gear mechanism. Here, the torque is also supported by the flywheel 11 via the planetary gear mechanism 37. This preferably occurs during acceleration of the vehicle (motor assist). An advantage of the planetary gear mechanism and flywheel is the output gain, so that the vehicle can be assisted at higher power levels.

  When the engine is turned off, the flywheel 11 can be released by driving the electric motor and / or generator 17 as a generator (low power, the engine does not start), during which the battery is charged. Is done. Similarly, the torque is supported by the flywheel 11 via the planetary gear mechanism 37. This preferably occurs after the engine is turned off. The advantage is that the stored (flywheel) brake energy can be gradually stored in the battery. In addition, storing the dominant energy of the flywheel in the battery and using it for restarting is also effective by maintaining the flywheel at an appropriate speed and then restarting the engine with the clutch 73. Is.

  The clutch 73 generates continuously due to its function, and the flywheel is overspeeded at high engine speeds (> 2000 rpm) combined with low speeds (> 0 rpm) of electric motors and / or generators. Prevent you from getting.

  When the clutch 73 is closed, the flywheel 11 rotates with the electric motor and / or generator 17 and the engine 3. The electric motor and / or generator can then be driven as both a generator and a motor. The clutch 73 is preferably closed while the vehicle is driven at high speed at high rpm (rpm) (> 2000 rpm). When accelerating at high engine speeds, the electric motor and / or generator 17 is used as a motor, allowing the flywheel to increase its rotation and not to be high speed, so that the flywheel is excessively rotated by the engine. There is no need to be increased. The speed of the flywheel is consequently very limited, but this can only occur temporarily.

  In the ninth embodiment of the drive mechanism 91 provided with the starting system 92 shown in FIG. 9, the alternator 93 is connected to the planetary gear mechanism 37. With the closed clutch 73, the starting system operates as an existing alternator.

  When the vehicle is braked, the clutch 73 can be released, so that the flywheel 11 gains speed by continuing to generate with the alternator. The rotational speed (rpm) of the flywheel then reaches the order of about 3000 to 10000 rpm when the engine is about 1000 rpm. When the engine is turned off, the ring of the planetary gear mechanism 37 (to which the alternator is connected) rotates in the negative direction. Due to the freewheel bearing 95, the alternator need not rotate too much in the negative direction (the latter therefore remains fixed). In order to maintain the flywheel 11 at an appropriate speed, a small electric motor (not shown) is now connected to the flywheel that can receive the output. If a restart is desired, the clutch 73 is closed, and therefore the flywheel raises the engine rotation by a friction clutch. The advantage is that the electric starting system does not need to be adjusted and the accumulator is not installed more frequently.

This starting system 92 can also be connected to the crankshaft 9 on the other side of the engine 3 (engine flywheel side).

  In the drive mechanism 101 including the start system 102 shown in FIG. 10, the friction brake 103 is used to start the engine 3. The advantage is that the reduction ratio at which the impulse start occurs is approximately 1:10, so less energy is lost in the brake than the impulse start by the clutch 73.

  In order to produce continuously with the alternator 93, the clutch 73 or the brake 105 should be applied and operated as described above. The charging of the flywheel 11 can be realized by both the friction brake 103 and the alternator 93.

  11 and 12 show the eleventh and twelfth embodiments of the drive mechanisms 111 and 121 including the starting systems 112 and 122, respectively. In the starting system 112 shown in FIG. 11, the brake 113 is connected to the ring of the planetary gear mechanism 37. In parallel with the planetary gear mechanism 37, the freewheel bearing 115 is connected to the planet carrier and sun gear of the planetary gear mechanism. In the starting system 122 shown in FIG. 12, the free wheel bearing 115 is connected in parallel to the reduction gear 123 and the clutch 125. In this case, the alternator and the electric motor and / or generator are replaced with a starter alternator 127. Optionally, the flywheel 117 can be incorporated into these starting systems.

In the generator mode, the alternator 93 or the starter alternator 127 can apply a braking torque to the crankshaft 9 via the free wheel bearing 115. In this case, the reduction gear is not used (1: 1).

  By actuating the friction clutch 125 or the friction brake 113, the alternator 93 or starter alternator 127 can increase its rotation when the engine is between 1000 and 2000 rpm. This does not require power. By increasing the inertia of the alternator, kinetic energy is saved. This preferably occurs when the brake is applied or the accelerator pedal is released. In this way, the brake energy can be recovered. The stored kinetic energy is used to recharge the battery by allowing it to generate power with an alternator. For this purpose, the clutch 125 or the brake 113 should be opened again.

  The stored kinetic energy can also be used for impulse instruction. When the engine is turned off, the brake 113 or the clutch 125 is released, and the inertia of the flywheel 117 and / or the alternator 93 or the starter alternator 127 is maintained at an appropriate rotational speed (rpm).

  If a restart is desired, the brake 113 or the clutch 125 can be closed, so that the engine 5 is started without an electrical system load.

Although the present invention has been described above with reference to the drawings, the present invention should not be limited in any way to the embodiments shown in the drawings. The invention also covers all embodiments that depart from the embodiments shown in the drawings within the spirit and scope defined by the claims. For example, a further clutch may be located between the clutch and the output member. This further clutch is in this case preferably configured as a centrifugal disengagement device which disengages when a certain speed (rpm) is exceeded. In this case, this centrifugal separation device is preferably connected directly on one side to the crankshaft .

Claims (17)

A starting system for a vehicle engine,
An output member;
Clutch,
Connection means for connecting the clutch to the output member;
A flywheel unit including a further output member connected to the clutch, a flywheel, and further connecting means for connecting the flywheel to the further output member;
A drive source connected to the flywheel unit and which, when turned on, produces an output sufficient to cause the flywheel to maintain its speed;
The connection means further includes a reduction gear positioned between the output member and the clutch ,
A further clutch is located between the clutch and the output member;
The further clutch is arranged as a centrifugal disengagement device that disengages above a certain speed , or a further flywheel clutch or further freewheel bearing is located between the flywheel and the output member system.   The starter system of claim 1, wherein a maximum output that can be delivered by the drive source is just sufficient for the flywheel to maintain an appropriate speed.   The starting system according to claim 2, wherein a maximum output of the driving source is 500W.   The starting system according to claim 2, wherein a maximum output of the driving source is 50W.   The starting system according to any one of claims 1 to 4, wherein the connecting means further includes a further reduction gear located between the flywheel and the clutch.   6. The starting system according to claim 5, wherein a flywheel clutch or a freewheel bearing is arranged in parallel with the clutch and the reduction gear or the further reduction gear.   The clutch and the reduction gear or the further reduction gear are formed by a planetary gear mechanism including a brake and at least three rotating members, and a first rotating member of the planetary gear mechanism is connected to the output member, The starting system according to claim 6, wherein a two-rotating member is connected to the flywheel, and a third rotating member is connected to the brake.   8. The starting system according to claim 7, wherein the brake is formed by the drive source configured as an electric motor or by an electric motor and / or generator.   9. The starting system according to claim 8, wherein the flywheel is formed by a rotor of the electric motor and / or generator, or the flywheel is connected to a rotor of the electric motor and / or generator.   10. A starting system according to any one of claims 8 to 9, wherein a further brake is connected to the electric motor and / or generator or to the flywheel.   11. A starting system according to any one of the preceding claims, wherein the brake or clutch is released in an inoperative state and is maintained in the released state by a spring or a centrifugal element. The starting system according to claim 1, wherein the centrifugal detachment device is directly connected on one side to a crankshaft . 13. A starting system according to claim 1 or 12, wherein the centrifugal disengagement device is combined with a clutch that can be actuated by a control signal . A drive mechanism for a vehicle including an engine and the starting system according to any one of claims 1 to 13,
The output member is a drive mechanism connected to a crankshaft of the engine. The engine includes a multi-belt and a pulley connected to an end of the crankshaft and transporting the multi-belt, and an output member of the starting system is connected to an end of the crankshaft. 14. The drive mechanism according to 14. The drive mechanism according to claim 15, wherein an output member of the starting system is connected to a further pulley connected to the crankshaft via the multi-belt. The drive mechanism of claim 16, wherein an output member of the start system is connected to an end of the crankshaft of the engine via an additional pulley transmission mechanism.

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