KR102665746B1 - A Electric drive train with two-speed shifting - Google Patents

Abstract

An electric drive train capable of two-speed shifting according to an embodiment of the present invention includes a first motor; a second motor driven independently from the first motor; a travel driving unit provided to receive and output power generated from one or more motors selected from the first motor and the second motor; and a power extractor provided to receive and output power generated from the second motor and connected to the travel drive unit to provide power, wherein the travel drive unit is connected to the power extractor. It is characterized in that it is driven so that the power transmission path is different depending on whether it is connected or not.

Description

A Electric drive train with two-speed shifting}

The present invention relates to an electric drive train, and more specifically, to an electric drive train that is suitable for agricultural vehicles, including tractors, and is capable of two-speed shifting while being driven by an electric drive method.

In general, agricultural work vehicles have structures and characteristics that are advantageous for performing various agricultural tasks. For example, by attaching implements such as rakes, rotavators, plows, and harrows to the hitch, you can easily perform various agricultural work such as tillage, soil removal, pest control, pumping, and threshing. You can.

For example, a tractor, widely known as an agricultural work vehicle, has a driving system power transmission device that transmits power from the engine to the drive wheels through a transmission, and a PTO (PTO) that transmits power to the PTO shaft to drive various types of implements mounted on the tractor. It has a structure that supplies power to the power transmission system (Powertake off).

Here, the driving system power transmission device includes a main drive shaft through which power is transmitted from the crankshaft of the engine through a flywheel, etc., a transmission device that converts the power of the main drive shaft into torque and transmits it to the rear wheels (rear axle), etc. A forward and reverse shuttle clutch that changes the rotation direction of the power transmitted from the main drive shaft to the transmission device to switch the tractor forward and backward, a main gear shaft that receives power from the transmission device, and a main gear shaft that receives power from the main gear shaft. It consists of a driven shaft that receives the power and transmits it to the rear axle.

In addition, the PTO power transmission device includes a PTO drive shaft directly connected to the rear of the main drive shaft, a PTO clutch that intermittently transmits power from the main drive shaft to the PTO drive shaft, and a reduced speed transmission of power from the PTO drive shaft. It consists of a driven PTO shaft.

However, because conventional tractors use diesel engines, not only do they emit a lot of pollutants, but the mechanical structure of the power transmission device is very complicated.

Accordingly, research and development on electric-driven tractors have recently been actively conducted in terms of environmental and energy aspects and structural simplification.

However, in the case of electric drive type tractors currently being developed, the driving motor that outputs power for driving the tractor and the PTO motor for driving the power transmission device are separated and arranged to be operated separately.

However, due to the characteristics of the environment in which the tractor is mainly operated, higher driving output is required for stable operation of the tractor in a soil environment where slip occurs. However, when the driving motor is enlarged to secure driving output, the tractor It is difficult to install an electric drive train on a car body, so preparation measures are needed.

KR 10-2120174 B1 (2020.06.02)

The present invention is intended to solve the above-described problems, and more specifically, to combine the power generated through a motor for driving an agricultural vehicle and the power generated through a motor for extracting power for performing agricultural work to the agricultural vehicle. The purpose is to provide an electric drive train capable of two-speed shifting that can be used for driving and can more effectively use the power output range to perform more stable driving and agricultural work even in rough terrain.

An electric drive train capable of two-speed shifting according to an embodiment of the present invention includes a first motor; a second motor driven independently from the first motor; a travel driving unit provided to receive and output power generated from one or more motors selected from the first motor and the second motor; and a power extractor provided to receive and output power generated from the second motor and connected to the travel drive unit to provide power, wherein the travel drive unit is connected to the power extractor. It is characterized in that it is driven so that the power transmission path is different depending on whether it is connected or not.

More specifically, the traveling drive unit of the electric drive train capable of two-speed shifting according to an embodiment of the present invention includes a first input shaft provided to receive power from the first motor; a planetary gear assembly that is coupled to the input shaft to receive power from the first motor and includes a ring gear to enable input of power transmitted through the power extractor; and a first power transmission shaft engaged with the planetary gear assembly.

More specifically, the power take-off unit of the electric drive train capable of two-speed shifting according to an embodiment of the present invention includes a second input shaft provided to receive power from the second motor; Power transmission means coupled to the second input shaft to provide power toward the planetary gear assembly; and a second power transmission shaft provided to receive power provided by the second motor from the second input shaft.

More specifically, the planetary gear assembly of an electric drive train capable of two-speed shifting according to an embodiment of the present invention includes a sun gear engaged with the first input shaft and forming an external groove; a plurality of pinion gears provided to engage and rotate with the sun gear; a carrier provided to accommodate the plurality of pinion gears and configured to receive and output power transmitted from at least one input shaft selected from the first input shaft and the second input shaft; And a ring gear provided to hold a ring shape and having internal and external teeth formed to receive power output through one or more selected from the sun gear and the power take-off unit.

More specifically, the planetary gear assembly of an electric drive train capable of two-speed shifting according to an embodiment of the present invention fixes or unfixes the carrier to the ring gear, so that the carrier relative to the ring gear It further includes a carrier clutch provided to change the rotation state, wherein when the ring gear and the carrier are fixed to each other and rotate, the electric drive drive train is driven at high speed, and the ring gear When the and the carrier rotate without being fixed to each other, the electric drive train is driven at a low speed.

More specifically, the power take-off unit of the electric drive train capable of two-speed shifting according to an embodiment of the present invention is provided between the second input shaft and the planetary gear assembly, and the planetary gear is connected to the second input shaft. a power merge clutch that determines a transmission state of power transmitted to the assembly and provides power output from the second motor to the traveling drive unit; and a power take-off clutch that determines a transmission state of power transmitted from the second input shaft to the second power transmission shaft, wherein the planetary gear assembly fixes or unfixes the carrier to the ring gear, It further includes a carrier clutch provided to change the rotational state of the carrier with respect to the ring gear, wherein the electric drive drive train includes a plurality of devices determined depending on the operating states of the power combining clutch, the power take-off clutch, and the carrier clutch. It is characterized in that it is provided to have a driving mode of.

More specifically, the driving mode of the electric drive train capable of two-speed shifting according to an embodiment of the present invention is operated so that the power merge clutch is operated to transmit power from the second input shaft to the planetary gear assembly. and a low-speed drive mode in which the power take-off clutch is selectively operated; and a high-speed driving mode in which operation of the carrier clutch progresses and the carrier is relatively fixed to the ring gear and driven to rotate together.

More specifically, in the low-speed drive mode of the electric drive train capable of two-speed shifting according to an embodiment of the present invention, the power merge clutch is operated independently to transmit power from the second input shaft to the planetary gear assembly. It is characterized in that it includes; a first low-speed driving mode that proceeds to be transmitted.

More specifically, the low-speed drive mode of the electric drive train capable of two-speed shifting according to an embodiment of the present invention is when the power merge clutch is operated and power is transmitted from the second input shaft to the planetary gear assembly. , a second low-speed drive mode in which the power take-off clutch is operated to transmit power from the second input shaft to the second power transmission shaft.

More specifically, the electric drive train capable of two-speed shifting according to an embodiment of the present invention is characterized by further including a differential gear assembly provided to receive power output from the travel drive unit.

More specifically, the electric drive train further includes a differential gear assembly provided to receive power output from the travel drive unit, wherein the differential gear assembly reduces noise generated when the differential gear assembly is driven. It is characterized by including a plurality of bevel gears designed not to exceed a preset noise standard.

The electric drive train capable of two-speed shifting according to an embodiment of the present invention operates the drive train based on power through the first motor, and can utilize additional power through the second motor when necessary, allowing agricultural vehicles and While driving the vehicle, various agricultural tasks such as towing, transportation, harvesting, and rotary work can be performed smoothly at the same time.

In addition, the electric drive train capable of two-speed shifting according to an embodiment of the present invention enables miniaturization of the electric drive train through the application of a planetary gear assembly, and allows two-speed shifting to expand the power output range. It can be used effectively.

In addition, the electric drive train capable of two-speed shifting according to an embodiment of the present invention allows the power extractor to operate based on a second motor, which is a power source independent of the first motor for driving the vehicle, thereby ensuring stable operation of the power extractor. Operation is possible and at the same time, it is possible to prevent a decrease in the power output for driving the vehicle.

In addition, an electric drive train capable of two-speed shifting according to an embodiment of the present invention receives power from the first motor through a sun gear and applies a ring gear in which internal and external teeth are formed simultaneously to the planetary gear assembly, Power generated from two motors can be additionally provided, so if necessary, both the first motor and the second motor can be used as driving sources for driving the vehicle, thereby securing improved driving efficiency.

In addition, the electric drive train capable of two-speed shifting according to an embodiment of the present invention allows changing the gear ratio and power transmission path through a carrier clutch, thereby performing two-speed shifting with only one motor to increase power The output range can be used more effectively.

In addition, the electric drive train capable of two-speed shifting according to an embodiment of the present invention allows the power combining clutch, the power take-off clutch, and the carrier clutch to operate individually, thereby providing a driving mode for driving a vehicle and agricultural machinery. It becomes possible to operate a drive train based on multiple drive modes, such as a drive mode for the work being used, so that not only simple driving of the vehicle but also work using agricultural machinery can be performed more reliably.

In addition, the electric drive train capable of two-speed shifting according to an embodiment of the present invention allows driving by distinguishing between a low-speed drive mode and a high-speed drive mode using only the power merge clutch and the carrier clutch, thereby enabling the elements constituting the drive train to be controlled. As simplification can be achieved, the drive train can be miniaturized.

In addition, by allowing the vehicle to be operated separately in low-speed and high-speed drive modes, a drive mode suitable for various work conditions can be applied when operating a vehicle equipped with an electric drive train, providing improved usability. .

In addition, the electric drive train capable of two-speed shifting according to an embodiment of the present invention allows the power of the second motor to be output by combining the power of the first motor through the first low-speed drive mode, thereby temporarily When the vehicle's power is insufficient, additional power can be secured using the second motor, allowing stable operation of the vehicle.

In addition, the electric drive train capable of two-speed shifting according to an embodiment of the present invention can simultaneously operate the travel drive unit and the power take-off unit by simultaneously utilizing the first motor and the second motor, thereby enabling the electric drive train to operate simultaneously. When applied to an agricultural vehicle, the second low-speed drive mode allows the vehicle to be driven more stably while working through power withdrawal.

1 is a power system diagram showing the structure of a power transmission system of an electric drive train capable of two-speed shifting according to an embodiment of the present invention.
Figure 2 is a perspective view showing an electric drive train capable of two-speed shifting according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing an electric drive train capable of two-speed shifting according to an embodiment of the present invention cut along the AA′ direction of FIG. 2.
Figure 4 is a side cross-sectional view of an electric drive train capable of two-speed shifting according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Additionally, the terms used in this specification are for describing embodiments and are not intended to limit the present invention.

As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” and/or “comprising” does not exclude the presence or addition of elements other than the mentioned elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains.

Hereinafter, the present invention will be described with reference to the attached drawings.

Figure 1 is a power system diagram showing the structure of the power transmission system of an electric drive train capable of two-speed shifting according to an embodiment of the present invention, and Figure 2 is a power system diagram showing the structure of an electric drive train capable of two-speed shifting according to an embodiment of the present invention. It is a perspective view showing a driving drive train, and FIG. 3 is a cross-sectional view showing an electric drive train capable of two-speed shifting according to an embodiment of the present invention cut in the direction A-A' of FIG. 2, and FIG. 4 is a cross-sectional view showing the electric drive train capable of two-speed shifting according to an embodiment of the present invention. This is a side cross-sectional view of an electric drive train capable of two-speed shifting according to an embodiment of the invention.

As shown in Figures 1 to 4, the electric drive train capable of two-speed shifting according to an embodiment of the present invention includes a first motor 100, a second motor 200, a travel drive unit 300, and power It is characterized in that it includes a draw-out portion 400 and a differential gear assembly 500.

First, the first motor 100 is used as a power source to operate a vehicle equipped with the electric drive train of the present invention.

In addition, the second motor 200 is driven independently of the first motor 200 and can be used as a power source for operating the vehicle and as a power source for work using agricultural machinery mounted on the vehicle.

Next, the travel driving unit 300 is provided to receive and output power generated from one or more motors selected from the first motor 100 and the second motor 200.

In particular, the travel drive unit 300 may include a first input shaft 310, a planetary gear assembly 320, and a first power transmission shaft 330.

Here, the first input shaft 310 is coupled to the first motor 100 and is provided to receive the power of the first motor 100.

In addition, the planetary gear assembly 320 is coupled to the input shaft to receive power from the first motor, and includes a ring gear to enable input of power transmitted through the power extractor. .

In particular, the planetary gear assembly 320 may include a sun gear 321, a pinion gear 322, a carrier 323, a ring gear 324, and a carrier clutch 325.

More specifically, the sun gear 321 is engaged with the first input shaft to form an external groove to introduce power input through the first motor 100 into the planetary gear assembly.

In addition, the pinion gear 322 is provided to engage and rotate with the sun gear, and a plurality of pinion gears 322 are arranged to rotate along the outer diameter of the sun gear 321 with the sun gear 321 as the center. .

And, the carrier 323 is provided to accommodate the plurality of pinion gears 322.

In particular, the carrier 323 is provided to receive and output power transmitted from at least one input shaft selected from the first input shaft 310 and the second input shaft 410, which will be described later.

In addition, the ring gear 324 is provided to have a ring shape and is formed to receive power output through one or more selected from the sun gear and the power extractor.

In particular, the ring gear 324 has internal and external teeth, and the internal teeth of the ring gear 324 mesh with the external teeth of the pinion gear 322 coupled to the carrier 323.

In addition, the outer edge of the ring gear 324 may be designed to receive power from the second input shaft 410 by meshing with the power transmission means 420 that rotates by receiving power from the second input shaft 410. there is.

That is, while receiving power from the first motor 100 through the sun gear 321, a ring gear 324 having internal and external teeth formed at the same time is applied to the planetary gear assembly 320, thereby driving the first motor ( 100), while receiving power generated from the second motor 200, the power generated from the second motor 200 can be additionally provided, so that, if necessary, the first motor 100 and the second motor 200 can be used as driving sources necessary for driving the vehicle. Since all of them can be utilized, improved driving efficiency can be secured.

In addition, through the application of the planetary gear assembly 320, the electric drive train can be miniaturized, and two-speed shifting is possible, making it possible to use the power output range more effectively.

In addition, the carrier clutch 325 is provided to change the rotation state of the carrier 323 with respect to the ring gear 324 by fixing or unfixing the carrier 323 to the ring gear 324.

In particular, the electric drive train proceeds at high speed when the ring gear 324 and the carrier 323 are fixed to each other and rotate as one by the operation of the carrier clutch 325. I do it.

In addition, when the carrier clutch 325 is not operated and the ring gear 324 and the carrier 323 rotate without being fixed to each other, the electric drive train is driven at low speed.

In other words, by allowing the gear ratio and power transmission path to be changed through the carrier clutch 325, it is possible to perform two-speed shifting with only one motor and use the power output range more effectively.

In addition, the first power transmission shaft 330 is provided to be engaged with the planetary gear assembly, and the power transmitted through the above-described planetary gear assembly 320 via the first power transmission shaft 330 is transmitted to the vehicle. It is provided as a drive shaft for operation.

Next, the power extractor 400 is provided to receive and output power generated from the second motor, and is basically provided to provide power for driving agricultural machinery mounted on a vehicle, and if necessary, the It is connected to the travel drive unit 300 and is provided to provide power to the travel drive unit 300.

In particular, the power extractor 400 operates based on the second motor 200, which is a power source independent of the first motor 100 for driving the vehicle, and this ensures stable operation of the power extractor 400. At the same time, it is possible to prevent a decrease in the power output for driving the vehicle.

More specifically, the power take-off unit 400 includes a second input shaft 410, a power transmission means 420, a second power transmission shaft 430, a power merge clutch 440, and a power take-off clutch 450. may include.

More specifically, the second input shaft 410 is provided to receive power from the second motor 200 and is provided to be directly coupled to the second motor 200.

In addition, the power transmission means 420 is coupled to the second input shaft 410 and is provided to provide power received from the second motor 200 to the planetary gear assembly 320.

Next, the second power transmission shaft 430 is provided to receive power provided by the second motor 200 from the second input shaft 410.

Here, the second power transmission shaft 430 is a separately provided power take-off device for driving agricultural machinery mounted on the vehicle, and is provided to transmit power provided by the second motor 200, Power provided by the second motor 200 may be selectively transmitted according to the user's manipulation.

Additionally, the power combining clutch 440 is provided between the second input shaft 410 and the planetary gear assembly 320.

In particular, the power combining clutch 440 is provided to determine the transmission state of power transmitted from the second input shaft to the planetary gear assembly.

When the power merge clutch 440 operates, the power output from the second motor is provided to the traveling drive unit 300, and when the power merge clutch 440 does not operate, the second motor The power output from the motor 200 is not transmitted to the traveling drive unit 300.

Next, the power take-off clutch 450 is provided to determine the transmission state of power transmitted from the second input shaft 410 to the second power transmission shaft 430.

More specifically, the power take-off clutch 450 is provided to determine a coupling state between the second input shaft and the second power transmission shaft, and determines a power transmission state according to the coupling state.

Next, the differential gear assembly 500 is provided to receive power output from the travel drive unit 300.

Here, the differential gear assembly 400 may include a plurality of bevel gears designed so that noise generated when driving the differential gear assembly 400 does not exceed a preset noise standard.

More specifically, the differential gear assembly 400 includes a plurality of bevel gears having involute-shaped teeth, and the plurality of bevel gears engage and operate.

In particular, when the differential gear assembly is driven, the noise standard value may be 73 dB or less.

In addition, the plurality of bevel gears may be manufactured through a forging process, and the tooth shape of the bevel gear may be formed based on an involute curve.

Meanwhile, in the electric drive train, a plurality of driving modes are determined depending on the operating states of the power combining clutch, the power take-off clutch, and the carrier clutch.

More specifically, the power combining clutch, the power take-off clutch, and the carrier clutch are each operated individually, based on a plurality of driving modes including a driving mode for driving a vehicle and a driving mode for working with agricultural machinery. By making it possible to operate a drive train, not only simple driving of vehicles but also work using agricultural machinery can be performed more reliably.

At this time, the drive mode may be divided into a low-speed drive mode, a high-speed drive mode, and a power take-off mode, and the drive mode may be changed depending on the operating states of the power merge clutch, the power take-off clutch, and the carrier clutch described above. You can.

First, in the low-speed drive mode, the power combining clutch 440 is operated to transmit power from the second input shaft 410 to the planetary gear assembly 300, and the power take-off clutch 450 is selectively operated. This mode operates as:

At this time, the low-speed drive mode is mainly used when driving force for driving the agricultural machinery is required simultaneously with the operation of the agricultural vehicle equipped with the agricultural machinery.

More specifically, the low-speed driving mode may include a first low-speed driving mode and a second low-speed driving mode.

Here, the first low-speed driving mode can be used to operate an agricultural vehicle equipped with agricultural machinery that does not significantly require an independent driving source.

Typically, when performing plowing work, which is the work of plowing a rice paddy or field, using an agricultural vehicle equipped with a plow as an agricultural machine, the agricultural vehicle may be operated by applying a first low-speed drive mode.

More specifically, the first low-speed driving mode is a mode in which the power combining clutch 440 is operated independently to transmit power from the second input shaft 410 to the planetary gear assembly 320.

At this time, the power transmission means 420 and the ring gear 324 are meshed with each other to transmit power, and the ring gear 324, which receives power through the power transmission means 420, is connected to the pinion gear 322 and Power is transmitted to the first power transmission shaft 330 through the carrier 323.

That is, the power of the second motor 200 can be output by merging it with the power of the first motor 100, so that when the power of the vehicle during agricultural work is insufficient, the second motor 200 can be used to provide additional power. By securing power, it is possible to operate the vehicle stably.

Next, the second low-speed drive mode can be used to operate an agricultural vehicle equipped with agricultural machinery that essentially requires an independent drive source.

Typically, after the plowing work is performed, in order to perform the rotary work, which is a work of breaking up the soil clods of the plowed rice field or field, when the rotary work is performed using an agricultural vehicle equipped with a rotary as an agricultural machine, the second low speed The agricultural vehicle can be operated by applying the driving mode.

More specifically, in the second low-speed driving mode, the power combining clutch 440 is operated and power is transmitted from the second input shaft 410 to the planetary gear assembly 320, and the power take-off clutch 450 are operated together to transmit power from the second input shaft 410 to the second power transmission shaft 430.

At this time, the second power transmission shaft 430 provides power to the rotary attached to the agricultural vehicle, so that the rotary is driven and the vehicle can run at low speed simultaneously.

In particular, through the second low-speed drive mode, the first motor 100 and the second motor 200 can be simultaneously utilized to operate the travel drive unit 300 and the power take-off unit 400 together. , When applying an electric drive train to an agricultural vehicle, the second low-speed drive mode allows the vehicle to be driven more stably while working through power withdrawal.

In addition, in the high-speed driving mode, the carrier clutch is operated so that the carrier is relatively fixed to the ring gear and rotates together.

At this time, the high-speed driving mode can be used for transporting goods and simple driving through the vehicle.

In particular, the elements constituting the drive train can be simplified by being able to drive the low-speed drive mode and the high-speed drive mode using only the power merge clutch 440 and the carrier clutch 325, thereby simplifying the drive train. Miniaturization can be carried out.

In addition, by allowing the vehicle to be operated separately in low-speed and high-speed drive modes, a drive mode suitable for various work conditions can be applied when operating a vehicle equipped with an electric drive train, providing improved usability. It will happen.

Lastly, the power take-off mode is a mode in which the power take-off clutch 450 is operated to transmit power from the second input shaft to the second power transmission shaft.

In particular, through the power take-off mode, agricultural machinery mounted on the vehicle can be driven and work can be performed through operation of the power take-off clutch even when the vehicle is stopped or in operation.

In addition, if the vehicle equipped with an electric drive train capable of two-speed shifting according to an embodiment of the present invention is an agricultural vehicle including a tractor, the above-described mode change can be performed to freely operate the agricultural vehicle. there is.

More specifically, when the work performed by the agricultural vehicle includes at least one of plow work, rotary work, loader work, and transport work, the agricultural vehicle is operated by changing the driving mode described above for each task. It becomes possible to operate.

As described above, the present invention has been described with reference to the drawings, but this is only for illustrating the invention, and those skilled in the art will understand that various modifications or equivalent embodiments can be made from the detailed description of the invention. You will be able to understand it.

Therefore, the true scope of rights of the present invention must be determined by the technical spirit of the patent claims.

100: 1st motor
200: 2nd motor
300: Travel driving unit
310: first input shaft
320: Planetary gear assembly
321: Sun gear
322: pinion gear
323: carrier
324: Ring gear
325: Carrier clutch
330: first power transmission shaft
400: Power take-out unit
410: second input shaft
420: Power transmission means
430: Second power transmission shaft
440: Power merge clutch
450: Power take-off clutch
500: Differential gear assembly

Claims (10)

first motor 100;
a second motor 200 driven independently of the first motor;
a travel driving unit 300 provided to receive and output power generated from one or more motors selected from the first motor and the second motor; and
A power extractor 400 is provided to receive and output power generated from the second motor and is connected to the travel drive unit to provide power,
The travel driving unit 300,
A first input shaft 310 provided to receive power from the first motor;
A planetary gear assembly 320 that is coupled to the input shaft and is provided to receive power from the first motor and includes a ring gear to enable input of power transmitted through the power extractor, wherein the power It is driven so that the power transmission path is different depending on whether or not it is connected to the draw-out part,
The power withdrawal unit 400 is
a second input shaft 410 provided to receive power from the second motor;
a second power transmission shaft 430 provided to receive power provided by the second motor from the second input shaft;
Power provided between the second input shaft and the planetary gear assembly, determines the transmission state of power transmitted from the second input shaft to the planetary gear assembly, and provides power output from the second motor to the traveling drive unit. merge clutch 440; and
It includes a power take-off clutch 450 that determines the transmission state of power transmitted from the second input shaft to the second power transmission shaft,
The planetary gear assembly 320 is,
A sun gear 321 that is fastened to the first input shaft and has an external groove formed thereon;
a plurality of pinion gears 322 provided to engage and rotate with the sun gear;
A carrier 323 provided to accommodate the plurality of pinion gears and configured to receive and output power transmitted from at least one input shaft selected from the first input shaft and the second input shaft;
A ring gear 324 having internal and external teeth formed to receive power output through one or more selected from the sun gear and the power extractor; and
A carrier clutch 325 is provided to change the rotational state of the carrier with respect to the ring gear by fixing or unfixing the carrier to the ring gear,
It is provided to have a plurality of drive modes determined depending on the operating states of the power combining clutch, the power take-off clutch, and the carrier clutch,
The driving mode is,
A low-speed drive mode in which the power combining clutch is operated and driven to transmit power from the second input shaft to the planetary gear assembly, and the power take-off clutch is selectively operated.
The low-speed driving mode is,
A first low-speed drive mode in which the power combining clutch is operated independently to transmit power from the second input shaft to the planetary gear assembly. According to claim 1,
The travel driving unit 300,
An electric drive train capable of two-speed shifting, comprising a first power transmission shaft 330 engaged with the planetary gear assembly. According to claim 1,
The power extraction unit 400,
An electric drive train capable of two-speed shifting, comprising a power transmission means (420) coupled to the second input shaft and provided to provide power toward the planetary gear assembly. delete According to claim 1,
The planetary gear assembly 320,
It further includes a carrier clutch 325 provided to change the rotational state of the carrier with respect to the ring gear by fixing or unfixing the carrier to the ring gear,
The electric drive train is,
When the ring gear and the carrier are fixed to each other and rotate, the electric drive train is driven at high speed,
An electric drive train capable of two-speed shifting, wherein when the ring gear and the carrier rotate without being fixed to each other, the electric drive train is driven at a low speed. delete According to claim 1,
The driving mode is,
A high-speed drive mode in which the carrier clutch operates so that the carrier is relatively fixed to the ring gear and rotates together. delete According to claim 1,
The low-speed driving mode is,
The power merge clutch is activated to transmit power from the second input shaft to the planetary gear assembly, and the power take-off clutch is activated to transmit power from the second input shaft to the second power transmission shaft. An electric drive train capable of two-speed shifting, characterized in that it includes a driving mode. According to claim 1,
The electric drive train is,
It further includes a differential gear assembly 500 provided to receive power output from the travel drive unit,
The differential gear assembly is,
An electric drive train capable of two-speed shifting, comprising a plurality of bevel gears designed so that the noise generated when driving the differential gear assembly does not exceed a preset noise standard.