KR100726222B1 - Power transmission mechanism for cvt and planetary gear type hybrid vehicles - Google Patents

Abstract

A continuous type and planetary gear type power transmitting device of a hybrid vehicle is provided to increase spatial efficiency by uniting a motor with a dynamo, to reduce a total weight of the vehicle, to convert into an engine mode from an area having high engine efficiency, to drive the vehicle in a zero emission mode and a hybrid mode, and to increase efficiency of the engine and the motor. A power transmitting device of a hybrid vehicle using a motor electrically operated with an engine(10) as a power source and applying a continuously variable transmission and a planetary gear(40) comprises a carrier(42), a sun gear(44), and a ring gear(46). The carrier of the planetary gear is connected through a C1 clutch to receive output power of the engine through a CVT(Continuously Variable Transmission,20). The sun gear of the planetary gear is connected with a motor(30). The ring gear of the planetary gear is connected with a ring gear brake(48) through a C2 clutch. The carrier and the ring gear are interconnected through a C3 clutch. The motor also serves as a dynamo.

Description

Power transmission mechanism for CVT and planetary gear type hybrid vehicles}

1 is a schematic configuration diagram showing a power transmission structure for a conventional hybrid vehicle.

Figure 2 is a schematic diagram showing a power transmission device for a continuously variable transmission and planetary gear hybrid vehicle according to the present invention.

Fig. 3 is an operating state diagram showing a case where the power transmission device of the present invention operates in the ZEV mode / regenerative braking mode A;

4 is an operating state diagram showing a case where the power transmission device of the present invention operates in the ZEV mode / regenerative braking mode (B);

Fig. 5 is an operating state diagram showing a case in which the power transmission device of the present invention operates in engine mode A / forced charging mode / hybrid mode.

Fig. 6 is an operating state diagram showing a case in which the power transmission device of the present invention operates in engine mode B / forced charging mode / hybrid mode.

7 is a table briefly showing whether the clutch is coupled to each of the driving modes implemented in the power transmission device of the present invention.

※ Explanation of symbols about main part of drawing ※

10 engine 12 output shaft

20: transmission 30: motor

40: planetary gear 42: carrier

44: sun gear 46: ring gear

48: ring gear brake C1, C2, C3: clutch

The present invention relates to a power transmission device for a continuously variable and planetary gear hybrid vehicle.

In general, a hybrid vehicle has a system for efficiently combining two or more different power sources, and in most cases, a system driven by a fuel-powered engine and an electric motor is used as the power source. have.

In the case of a system in which the engine and the motor are power sources, the combination of the engine, the motor, the transmission, the clutch, and the like forms a driving mechanism with a completely different principle and the efficiency is also different.

The hybrid vehicle is equipped with a continuously variable transmission (hereinafter referred to as 'CVT') instead of an automatic transmission, which is a conventional stepped transmission, and is configured to help improve fuel efficiency by allowing the engine to operate in a region where combustion consumption is low.

1 is a schematic configuration diagram showing a power transmission structure for a conventional hybrid vehicle.

A power split transmission 120 is connected to the output side of the engine 110, and the power split transmission 120 includes a power split mechanism 122, a generator 124 connected to the power split mechanism 122, and It includes a motor 126, the reduction gear 128 and the like installed on the connecting shaft of the generator 124 and the motor 126.

In addition, the generator 124 and the motor 126 are electrically connected to the battery 140 through the inverter 130.

In addition, such a power transmission structure has a control mechanism that is operated at the optimum efficiency according to each driving situation by combining an engine, a motor, and a generator, and the motor has a structure capable of running by the motor alone while being responsible for driving and regenerative braking. . The generator is responsible for speed control of the engine and charging of the high voltage battery, and is responsible for dynamic control of starting control and charging of the engine.

However, the conventional power transmission structure for a hybrid vehicle has the following problems.

First, since the motor generating the driving force and the generator for power generation are separated from each other, the efficiency of the space is reduced and the weight of the vehicle is also increased.

Next, since it has a structure for continuously driving the motor to maintain the speed ratio, energy loss has a big disadvantage.

Accordingly, an object of the present invention is to solve the above-described problems, and provides a power transmission device for a continuously variable speed and planetary gear hybrid vehicle, which is made of a motor and a generator to improve space efficiency and reduce a weight of a vehicle. It is.

In addition, another object of the present invention is to provide a power transmission device for a continuously variable speed and planetary gear hybrid vehicle, which is capable of switching to the engine mode in a high engine efficiency region.

In addition, another object of the present invention is a zero-emission vehicle (ZEV) mode and hybrid mode is possible, the transmission of the transmission is variable transmission and planetary gear type hybrid vehicle power transmission to drive in the region of the engine and motor efficiency is excellent. To provide a device.

As a technical configuration for achieving the above object, the present invention is a power transmission device for a hybrid vehicle that uses a fuel-powered engine and an electrically operated motor as a power source, and applies a continuously variable speed and planetary gear, The carrier of the gear is connected to receive the engine output through the CVT transmission through the C1 clutch, the sun gear of the planetary gear is connected to the motor, and the ring gear of the planet gear is connected to the ring gear brake through the C2 clutch. The carrier and the ring gear are connected to each other through a C3 clutch, thereby providing a power transmission device for a continuously variable and planetary gear hybrid vehicle.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic diagram showing a power transmission device for a continuously variable transmission and planetary gear hybrid vehicle according to the present invention.

It is a power transmission mechanism including an engine 10, clutches C1, C2, C3, transmission 20, and a generator-integrated motor 30, which is a parallel system capable of engine mode, ZEV mode, and hybrid mode. The transmission ratio is adjusted by the transmission 20 provided between the engine 10 and the motor 30.

In particular, the generator-integrated motor 30 is a structure that can perform both the role of the conventional motor and the generator, such a structure is well known to those skilled in the art will not be described in detail.

More specifically, the output shaft 12 of the engine 10 is connected to the carrier 42 of the planetary gear 40 via the Cl clutch through the CVT transmission 20, and the output of the motor 30 is a planetary gear ( 40 is connected to the sun gear 44.

In addition, a C2 clutch is located between the ring gear 46 and the ring gear brake 48, and a C3 clutch is located between the carrier 42 and the ring gear 46.

This structure allows the output of the engine 10 to be supplied to the carrier 42 of the planetary gear 40 via the transmission 20, and the output of the motor 30 to the sun gear 44 of the planetary gear 40. The output of the engine 10 and the motor 30 implements engine mode, ZEV mode and hybrid mode by a combination of three clutches C1, C2 and C3.

First, the operation state in the case of the ZEV mode / regenerative braking mode A will be described with reference to FIG. Here, modes (A) and (B) represent different speed ratios generated in the planetary phase.

In this mode, the C1 and C3 clutches are off and the C2 clutch is on.

In this state, electric power is supplied to the motor 30, and the output of the motor 30 is supplied to the sun gear 44. Since the C2 clutch is in the on state, the ring gear 46 is in a fixed state and the carrier 42 is in a driven state.

Therefore, the speed ratio defined by the ratio of the number of driven teeth to the number of driven teeth is (number of teeth of the sun gear + the number of teeth of the ring gear) / number of teeth of the sun gear.

Next, an operation state in the case of the ZEV mode / regenerative braking mode B will be described with reference to FIG.

In this mode, the C1 and C2 clutches are off and the C3 clutch is on.

In this state, electric power is supplied to the motor 30, and the output of the motor 30 is supplied to the sun gear 44. Since the C3 clutch is in the on state, the ring gear 46 is driven, and the carrier 42 is in a fixed state.

Therefore, the gear ratio generated in the planetary group is the number of teeth of the ring gear / number of sun gear.

Next, an operation state in the case of the engine mode A / forced charging mode / hybrid mode will be described with reference to FIG.

In this mode, the C2 clutch is off and the C1 and C3 clutch are on.

This state is used in a region where the efficiency of the motor 30 is low and the efficiency of the engine 10 is high.

Since the carrier 42 is in the drive state and the C3 clutch is in the on state, the ring gear 46 is driven, driven with the carrier 42.

As the direct connection mode in which the output of the engine 10 is directly transmitted to the drive shaft, the output of the engine 10 is transmitted to the motor 30 through the carrier 42 and the sun gear 44, thereby allowing forced charging. In addition, by supplying power to the motor 30, a hybrid mode is possible.

Next, an operation state in the case of the engine mode B / forced charging mode / hybrid mode will be described with reference to FIG.

In this mode, the C3 clutch is off and the C1 and C2 clutch are on.

This state is used in a region where the efficiency of the motor 30 is low and the efficiency of the engine 10 is high, as in the case of FIG.

The ring gear 46 is fixed because the carrier 42 is driven and the C2 clutch is on.

5, the output of the engine 10 is transmitted to the motor 30 through the carrier 42 and the sun gear 44 as a direct connection mode in which the output of the engine 10 is directly transmitted to the drive shaft. Charging is possible. In addition, by supplying power to the motor 30, a hybrid mode is possible.

Since the ring gear 46 is fixed as compared with the engine mode A, the speed ratio between the engine and the motor connected to the planetary gear 40 is different.

Figure 7 briefly shows whether the clutch is coupled to each of the driving modes described above, (A), (B) of each mode is a different transmission ratio is generated in the planetary, engine mode is the power supply of the drive motor By adjusting, it is possible to implement forced charging mode and hybrid mode.

As described above, according to the present invention, the continuously variable transmission and planetary gear hybrid vehicle power transmission device includes a motor and a generator to improve the efficiency of the space and reduce the weight of the vehicle.

In addition, three clutch combinations and ring gear operation by ring gear brakes enable ZEV, engine and hybrid modes. In particular, the implementation of ZEV mode, which completely separates the engine from the dynamometer, is very effective in improving fuel economy.

In addition, according to the structure in which the ring gear and the ring gear brake are connected through the clutch instead of driving the ring gear, there is no need to always operate the motor to maintain the speed ratio.

In addition, the clutch combination makes it possible to realize two speed ratios without using a transmission in ZEV mode.

Claims (2)

In a power transmission device for a hybrid vehicle that uses a fuel-powered engine and an electric motor as a power source, and employs continuously variable speed and planetary gears, The carrier 42 of the planetary gear 40 is connected to receive the output of the engine 10 through the CVT transmission 20 through the Cl clutch, and the sun gear 44 of the planetary gear 40 is connected to the motor ( 30), the ring gear 46 of the planetary gear 40 is connected to the ring gear brake 48 through the C2 clutch, the carrier 42 and the ring gear 46 are mutually connected via the C3 clutch Power transmission for continuously variable speed and planetary gear hybrid vehicle, characterized in that connected. According to claim 1, wherein the motor 30 is a power transmission device for a variable speed and planetary gear hybrid vehicle, characterized in that configured to perform a role as a generator.

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