Drive system of electric mobility vehicle and electric tractor including same

Abstract

The present invention relates to a drive system of an electric mobility vehicle and an electric tractor including same. The drive system of an electric mobility vehicle may comprise: a first drive module which connects between a first motor and a drive shaft of the electric mobility vehicle and transmits a first driving force; a second drive module which connects between a second motor and a power take off device and transmits a second driving force; and a drive linkage module which selectively links or unlinks the first drive module and the second drive module so that at least one of the second driving force, transmitted from the second motor to the second drive module, or a third driving force, applied from an external power source through the power take off device and transmitted to the second drive module, can be added to the first driving force on the first drive module to assist in the driving of the electric mobility vehicle.

Description

Drive system for electric mobility and electric tractor including the same

[0001] The present invention relates to a drive system for electric mobility and an electric tractor including the same, and more particularly, to a drive system for electric mobility capable of optimizing the drive of electric mobility in an agricultural work environment and an electric tractor including the same.

[0002] Typically, agricultural vehicles, called tractors, are structurally similar to regular automobiles, but are equipped with powerful engines and high-ratio transmissions, resulting in excellent traction and durability, making them primarily used for farming. These tractors are configured to accommodate various external implements, such as plows or rotary devices for leveling or leveling the soil, at the rear or front of the vehicle, as needed. Traditionally, tractors were primarily powered by internal combustion engines like diesel engines. However, due to the harmful gases and noise generated during operation, low energy efficiency, and international environmental regulations, there has been a recent paradigm shift toward electric tractors.

[0003] However, these conventional electric tractors have a problem in that the traction force and PTO output of the power take-off device are limited depending on the output of the electric motor driving the tractor, so when using an external implement (e.g., a plow) that requires a traction force greater than the available output capacity or an external implement (e.g., a rotary) that requires a power capacity greater than the available output capacity, the external implement must be used in a limited manner.

[0004] To solve this problem, there was a problem that farming work took more time because it required renting an electric tractor with more power at additional cost or replacing it with an external implement of relatively small size.

[0005] In addition, in the case of electric tractors, there is a limit to the capacity of high-voltage batteries, so in the case of high-load work, discharge easily occurs even in short-term operation, and the process of moving from the farm field to a charging station to charge and then moving back to the farm field to work has to be repeated, which has the problem of excessively reducing the efficiency of farm work.

[0006] In this way, in the past, when work requiring a larger capacity than the capacity of the electric tractor owned was required, additional costs had to be incurred to rent an electric tractor with a larger output or an external implement with a relatively smaller capacity to perform the work, which made it difficult to actively respond to external implements of various capacities, resulting in inefficiency in farming operations. In addition, in order to solve this problem, if all electric tractors of various outputs were equipped to respond to external implements of all capacities, or if an electric tractor with an excessively large output was equipped, inefficiency in tractor costs could occur, and since an electric tractor with a large output had to be always operated for farming operations that mainly required small capacity, there was a problem of lowering the efficiency of farming operations.

[0007] The present invention is intended to solve various problems including the above-described problems, and has a dual drive structure in which a first drive module for transmitting a first driving force from a first electric motor to a drive shaft of an electric tractor and a second drive module for transmitting a second driving force from a second electric motor to a power take-off device can be selectively linked with each other, thereby enabling the driving force of each drive module to be used individually or combined as needed, thereby optimizing the driving of the electric tractor in an agricultural environment, and an electric tractor including the same. However, these tasks are exemplary and the scope of the present invention is not limited thereby.

[0008] According to one embodiment of the present invention, a driving system for electric mobility is provided. The driving system for electric mobility comprises: a first drive module that connects a first electric motor that provides a first driving force for driving electric mobility and a driving shaft of the electric mobility to transmit the first driving force; a second electric motor that provides a second driving force for taking power out to an external work machine through a power take-off (PTO) of the electric mobility or for assisting the driving of the electric mobility, and a second drive module that connects the power take-off to transmit the second driving force; And it may include a drive linkage module that selectively links or releases between the first drive module and the second drive module by a combination of planetary reduction units so as to add at least one of the second driving force transmitted from the second electric motor to the second drive module side and the third driving force applied from an external power source through the power take-off device and transmitted to the second drive module side to the first driving force on the first drive module side, thereby assisting the driving of the electric mobility.

[0009] According to one embodiment of the present invention, the first drive module and the second drive module may further include a control unit electrically connected to the drive linkage module and applying a control signal to the drive linkage module so that the first drive module and the second drive module can be selectively linked or released from each other by the drive linkage module.

[0010] According to one embodiment of the present invention, the control unit may apply a control signal to the drive linkage module so that the first drive module and the second drive module can be linked in a driving force assistance mode in which at least one of the second driving force provided from the second electric motor and the third driving force provided from the external power source is added to the first driving force provided from the first electric motor to assist driving of the electric mobility.

[0011] According to one embodiment of the present invention, the control unit can apply a control signal to the drive linkage module so that the linkage between the first drive module and the second drive module can be released in a power take-off mode in which the second driving force provided from the second electric motor is taken out externally through the power take-off device.

[0012] According to one embodiment of the present invention, the control unit can apply a control signal to the drive linkage module so that the linkage between the first drive module and the second drive module can be released in a power generation mode in which the third driving force provided from the external power source drives the second motor to generate power.

[0013] According to one embodiment of the present invention, the drive linkage module may include: the planetary reducer unit installed on the first drive module and applying the first driving force provided from the first electric motor to the driving shaft side, or selectively adding at least one driving force among the second driving force provided from the second electric motor and the third driving force provided from the external power source to the first driving force provided from the first electric motor and applying the combined driving force to the driving shaft side; and a driving force conversion unit installed on the second drive module and selectively applying at least one driving force among the second driving force provided from the second electric motor and the third driving force provided from the external power source to the planetary reducer unit side.

[0014] According to one embodiment of the present invention, the driving force conversion unit may include: a first spur gear fixedly installed on a second drive shaft of the second drive module that rotates by at least one driving force among the second driving force provided from the second electric motor and the third driving force provided from the external power source, and that rotates together with the second drive shaft; a second spur gear that is installed on the second drive shaft in parallel with the first spur gear and is freely rotatably installed on the second drive shaft so as to be able to rotate or stop independently of the second drive shaft; and a synchronizer that selectively connects the second spur gear and the first spur gear by sliding movement so that the second spur gear can rotate selectively in synchronization with the first spur gear.

[0015] According to one embodiment of the present invention, the second spur gear is formed as a multi-stage spur gear including a 2-1 spur gear having the same outer diameter and the same number of gear teeth as the first spur gear and a 2-2 spur gear having a different outer diameter and a different number of gear teeth than the 2-1 spur gear, and the synchronizer can selectively connect between the first spur gear and the 2-1 spur gear formed with the same outer diameter and the same number of gear teeth by sliding movement.

[0016] According to one embodiment of the present invention, the planetary reducer unit comprises: a sun gear, which is fixedly installed at an end of a 1-1 drive shaft of the 1st drive module that rotates by the first driving force provided from the 1st electric motor as a first input shaft to which the 1st driving force is input, and which rotates together with the 1-1 drive shaft; a ring gear, which is formed in a ring shape surrounding the sun gear and is connected to the 2nd spur gear by a gear combination as a 2nd input shaft to which at least one of the 2nd driving force and the 3rd driving force is selectively input, and which rotates or stops together with the 2nd spur gear by connecting the 2nd spur gear to the 2nd input shaft; And an output shaft that outputs a driving force alone by the first driving force or a combined driving force that is the sum of the driving force of the first driving force and at least one of the second driving force and the third driving force, the output shaft being formed between the sun gear and the ring gear and rotating simultaneously with the orbital motion centered on the sun gear, and a planetary gear that is formed coaxially with the 1-1 drive shaft and connected to the drive shaft by a gear combination and is fixedly installed at the end of the 1-2 drive shaft, the planetary gear rotating together with the 1-2 drive shaft by the orbital motion.

[0017] According to one embodiment of the present invention, the drive linkage module may further include a brake unit disposed between the first drive module and the second drive module and capable of stopping transmission of driving force from the second drive module to the first drive module.

[0018] According to one embodiment of the present invention, the brake unit connects the second spur gear of the driving force conversion unit and the ring gear of the planetary reduction unit by a gear combination so as to transmit driving force between the driving force conversion unit and the planetary reduction unit, and can selectively stop the second spur gear and the ring gear.

[0019] According to one embodiment of the present invention, the brake unit may include: a rotary shaft freely rotatably installed between the driving force conversion unit and the planetary reducer unit; a connecting spur gear fixedly installed on the rotary shaft and rotating together with the rotary shaft, and connecting between the second spur gear and the ring gear by a gear combination; and a brake installed on the rotary shaft to selectively restrict free rotation of the rotary shaft.

[0020] According to one embodiment of the present invention, the control unit, in a driving force assist mode in which auxiliary driving force is applied to the electric mobility to increase traction force, may apply a control signal to the drive linkage module so that the second drive module and the first drive module are interlocked, and at least one of the second driving force and the third driving force may be added to the first driving force as the auxiliary driving force, thereby slidingly moving the synchronizer of the driving force conversion unit to a position in which the first spur gear and the second spur gear may be synchronized, and releasing the brake so that the connecting spur gear of the brake unit may rotate.

[0021] According to one embodiment of the present invention, the power take-off device may include a PTO shaft that is rotatable by being connected to the external work machine or the external power source; and a third drive shaft that is connected to the PTO shaft by a gear combination so as to be rotatable together with the PTO shaft at a predetermined gear ratio, and whose end can be selectively connected to the second drive shaft of the second drive module.

[0022] According to one embodiment of the present invention, the drive linkage module may further include a clutch unit installed between an end of the second drive shaft and an end of the third drive shaft, selectively connecting the second drive shaft and the third drive shaft.

[0023] According to one embodiment of the present invention, when the third driving force is applied as the auxiliary driving force in the driving force assist mode, the control unit can control the clutch unit to connect the second drive shaft and the third drive shaft by applying a control signal to the drive linkage module.

[0024] According to one embodiment of the present invention, when the third driving force is not applied as the auxiliary driving force in the driving force assist mode, the control unit can control the clutch unit to short-circuit between the second drive shaft and the third drive shaft by applying a control signal to the drive linkage module.

[0025] According to one embodiment of the present invention, the control unit may apply a control signal to the drive linkage module so that, in a power take-off mode in which power is taken out to the external working machine through the power take-off device, the linkage between the second drive module and the first drive module is released, so that the first driving force can be transmitted to the driving shaft, and the second driving force can be transmitted to the external working machine through the power take-off device separately from the first driving force, thereby slidingly moving the synchronizer of the driving force conversion unit to a position in which the first spur gear and the second spur gear can be desynchronized, and operating the brake so that the connecting spur gear of the brake unit can be restrained.

[0026] According to one embodiment of the present invention, the control unit may apply a control signal to the drive linkage module so that, in a power generation mode in which power is generated by driving the second motor with the third driving force applied from the external power source through the power take-off device, the linkage between the second drive module and the first drive module is released, so that the first driving force can be transmitted to the drive shaft, and the third driving force can be transmitted to the second motor through the power take-off device separately from the first driving force, thereby slidingly moving the synchronizer of the driving force conversion unit to a position in which the first spur gear and the second spur gear can be desynchronized, and operating the brake so that the connecting spur gear of the brake unit can be restrained.

[0027] According to another embodiment of the present invention, an electric tractor is provided. The electric tractor may include: a driving body capable of pulling an external work machine capable of performing agricultural work or assisting in performing the agricultural work; a first electric motor installed on the driving body and providing a first driving force for driving the driving body; a second electric motor installed on the driving body and providing a second driving force for taking power out to the external work machine through a power take-off (PTO) or assisting in driving the driving body; and a driving system of an electric mobility installed on the driving body and selectively increasing a traction force of the driving body by selectively adding at least one of the second driving force and a third driving force applied from an external power source through the power take-off to the first driving force.

[0028] According to one embodiment of the present invention as described above, a first drive module that transmits a first driving force applied from a first electric motor, and a second drive module that transmits at least one driving force among a second driving force applied from a second electric motor and a third driving force applied from an external power source through a power take-off device, have a dual drive structure that can be selectively linked with each other by a drive linkage module, thereby implementing a driving system of electric mobility in which the driving forces of each drive module can be used individually or combined as needed.

[0029] Accordingly, when power is taken out to an external work machine such as a rotary machine through a power take-off device of the electric tractor while the electric tractor is being driven, the drive linkage module releases the linkage between the first drive module and the second drive module, thereby enabling the first drive module and the second drive module to individually transmit driving power, thereby transmitting the first driving power to the drive shaft of the electric tractor through the first drive module, and separately transmitting the second driving power to the external work machine through the second drive module and the power take-off device.

[0030] In addition, when an external work machine such as a plow is towed by the driving of an electric tractor, and a situation arises where the external work machine must be used in a limited manner due to insufficient traction power of the electric tractor, the drive linkage module links the first drive module and the second drive module, and adds at least one of the second driving power and the third driving power transmitted through the second drive module to the first driving power transmitted to the drive shaft of the electric tractor through the first drive module, thereby increasing the traction power of the electric tractor, thereby resolving the insufficient traction power of the electric tractor.

[0031] In addition, when the electric tractor is stopped or moving, the third driving force provided from an external power source through a power take-off device is transmitted to the second motor through a second drive module that can operate independently from the first drive module by disengaging the drive linkage module, thereby driving the second motor to generate electricity, thereby charging the high-power battery of the electric tractor.

[0032] In this way, by increasing the limits of agricultural work determined by the output of the electric tractor through a dual drive structure that can be selectively linked with each other, the capacity of the electric motor mounted inside the electric tractor for driving the electric tractor can be reduced, thereby enabling system optimization and lowering the manufacturing cost of the electric tractor. In addition, from the user's perspective, the cost inefficiency of having to equip electric tractors with various capacities is resolved, so that high-capacity tractor work can be performed with only a single electric tractor, and a driving system for electric mobility and an electric tractor including the same can be implemented, which can increase agricultural work efficiency by reducing the inconvenience of having to move to a charging station for charging and enabling charging while on the move through a charging system using an external power source. Of course, the scope of the present invention is not limited by these effects.

[0033] FIG. 1 is a structural diagram schematically showing a driving system of electric mobility according to one embodiment of the present invention.

[0034] FIG. 2 is an image schematically illustrating one embodiment of an electric tractor including the drive system of the electric mobility of FIG. 1.

[0035] Figures 3 and 4 are structural diagrams showing the power flow in the drive system of the electric mobility of the electric tractor of Figure 2.

[0036] Figure 5 is an enlarged view of the “A” portion of Figures 3 and 4.

[0037] FIG. 6 is an image schematically illustrating another embodiment of an electric tractor including the drive system of the electric mobility of FIG. 1.

[0038] Fig. 7 is a structural diagram showing the power flow in the drive system of the electric mobility of the electric tractor of Fig. 6.

[0039] Figure 8 is an enlarged view of part “A” of Figure 7.

[0040] FIG. 9 is an image schematically illustrating another embodiment of an electric tractor including the drive system of the electric mobility of FIG. 1.

[0041] Fig. 10 is a structural diagram showing the power flow in the drive system of the electric mobility of the electric tractor of Fig. 9.

[0042] Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0043] The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The following embodiments may be modified in various ways, and the scope of the present invention is not limited to the following embodiments. Rather, these embodiments are provided to more faithfully and completely explain the present disclosure and to fully convey the spirit of the present invention to those skilled in the art. In addition, the thickness and size of each layer in the drawings are exaggerated for convenience and clarity of explanation.

[0044] Hereinafter, embodiments of the present invention will be described with reference to drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations in the shapes depicted may be expected, for example, depending on manufacturing techniques and / or tolerances. Therefore, embodiments of the present invention should not be construed as limited to the specific shapes of the regions depicted herein, but should include, for example, variations in shapes resulting from manufacturing processes.

[0045] FIG. 1 is a schematic structural diagram showing a driving system (1000) of electric mobility according to one embodiment of the present invention, FIG. 2 is an image schematically showing one embodiment of an electric tractor (10) including the driving system (1000) of electric mobility of FIG. 1, FIGS. 3 and 4 are structural diagrams showing the power flow in the driving system (1000) of electric mobility of the electric tractor (10) of FIG. 2, and FIG. 5 is an enlarged view of part “A” of FIGS. 3 and 4.

[0046] And, FIG. 6 is an image schematically showing another embodiment of an electric tractor (10) including the drive system (1000) of the electric mobility of FIG. 1, FIG. 7 is a structural diagram showing the power flow in the drive system (1000) of the electric mobility of the electric tractor (10) of FIG. 6, and FIG. 8 is an enlarged view of part “A” of FIG. 7. In addition, FIG. 9 is an image schematically showing another embodiment of an electric tractor (10) including the drive system (1000) of the electric mobility of FIG. 1, and FIG. 10 is a structural diagram showing the power flow in the drive system (1000) of the electric mobility of the electric tractor (10) of FIG. 9.

[0047] First, as illustrated in FIGS. 1 and 2, an electric tractor (10) including an electric mobility drive system (1000) of the present invention may include a driving body (11) that is an electric mobility (1) that operates by electric power and can pull an external work machine (20) that can perform agricultural work or assist in performing the agricultural work, a first electric motor (M1) that is installed on the driving body (11) and provides a first driving force (F1 in FIG. 3) for driving the driving body (11), and a second electric motor (M2) that is installed on the driving body (11) and provides a second driving force (F2 in FIG. 3) for taking power out to an external work machine (20) through a power take-off device (PTO) (500) or assisting in driving the driving body (11).

[0048] The first electric motor (M1) and the second electric motor (M2) are a type of electric motor that generates mechanical rotational driving force by receiving electric energy, and can receive the electric energy for driving from a high-power battery (B) installed in the driving body (11).

[0049] In addition, the driving system (1000) of the electric mobility is installed in the driving body (11) and can selectively increase the traction force of the driving body (11) by selectively adding at least one of the second driving force (F2) applied from the second electric motor (M2) and the third driving force (F3 in FIG. 4) applied from the external power source (30) through the power take-off device (500) to the first driving force (F1) applied from the first electric motor (M1).

[0050] As illustrated in FIG. 1, the driving system (1000) of electric mobility may largely include a first drive module (100), a second drive module (200), a drive linkage module (300), a control unit (400), a power take-off device (500), a driving module (600), and a transmission module (700).

[0051] As illustrated in FIG. 1, the first drive module (100) connects the first electric motor (M1) that provides the first driving force (F1) for driving (driving) the electric tractor (10) and the drive shaft (610) of the electric tractor (10) by a drive shaft and gear combination, so that the first driving force (F1) applied from the first electric motor (M1) can be transmitted to the drive shaft (610).

[0052] For example, the first drive module (100) may include a 1-1 drive shaft (110) that is connected to the first electric motor (M1) and rotates by the first driving force (F1) applied from the first electric motor (M1), and a 1-2 drive shaft (120) that is connected by a combination of the 1-1 drive shaft (110) and the planetary reducer unit (310) through a drive linkage module (300) to be described later, and rotates by the sole driving force by the first driving force (F1) or the combined driving force by adding the driving force of at least one of the second driving force (F2) and the third driving force (F3) to the first driving force (F1).

[0053] The first and second drive shafts (120) can be connected to the drive module (600) of the electric tractor (10) through a transmission module (700) including a plurality of gear combinations.

[0054] The transmission module (700) may include a transmission shaft (720) that is connected to the first-second drive shaft (120) and a pair of spur gear combinations (730) and rotates by the sole driving force or the combined driving force, and a drive shaft (710) that is connected to the transmission shaft (720) and rotates by a low-speed spur gear combination (740) or a high-speed spur gear combination (750) having different gear ratios, and transmits the sole driving force or the combined driving force to a drive shaft (610) having driving wheels (W) formed at both ends through a differential gear combination (620) connected to the end.

[0055] Here, the low-speed spur gear combination (740) and the high-speed spur gear combination (750) of the transmission module (700) can be selectively synchronized with the transmission shaft (720) by a synchronizer (760) slidably installed on the transmission shaft (720).

[0056] In addition, in this embodiment, the transmission module (700) is exemplified as including two spur gear combinations (740, 750) to transmit the sole driving force or the combined driving force to the driving module (600) at low or high speed, but is not necessarily limited thereto and may include a very diverse number of spur gear combinations depending on the number of gear stages required for the electric tractor (10).

[0057] As illustrated in FIG. 1, the second drive module (200) connects the second electric motor (M2) that provides the second driving force (F2) for power take-off to an external work machine (20) through the power take-off unit (500) of the electric tractor (10) or for assisting the driving of the electric tractor (10) to the power take-off unit (500) by a drive shaft and gear combination, so that the second driving force (F2) applied from the second electric motor (M2) can be transmitted to the power take-off unit (500) side or the first drive module (100) side.

[0058] Additionally, the second drive module (200) can transmit the third driving force (F3) applied from an external power source (30) through a power take-off device (500) to the first drive module (100) side or the second motor (M2) side.

[0059] For example, the second drive module (200) may include a second drive shaft (210) that is connected to a second electric motor (M2) and rotates by a second driving force (F2) applied from the second electric motor (M2).

[0060] On the second drive shaft (210), a driving force conversion unit (320) of a drive linkage module (300) to be described later is installed, so that at least one of the second driving force (F2) and the third driving force (F3) applied to the second drive shaft (210) can be selectively transmitted to the first drive module (100).

[0061] A power take-off device (500) connected to an end of a second drive module (200) may include a PTO shaft (510) that can rotate by being connected to an external work machine (20) or an external power source (30), and a third drive shaft (520) that is connected to the PTO shaft (510) by a pair of spur gear combinations (530, 540) so as to rotate at a predetermined gear ratio together with the PTO shaft (510), and whose end can be selectively connected to the second drive shaft (210) of the second drive module (200).

[0062] As illustrated in FIG. 1, the drive linkage module (300) can selectively link or release the first drive module (100) and the second drive module (200) by combining the planetary reduction unit (310) so as to add at least one of the second driving force (F2) transmitted from the second electric motor (M2) to the second drive module (200) and the third driving force (F3) applied from the external power source (30) through the power take-off device (500) and transmitted to the second drive module (200) to the first driving force (F1) of the first drive module (100) so as to assist the driving of the electric tractor (10).

[0063] At this time, the control unit (400) electrically connected to the drive linkage module (300) can control the drive linkage module (300) to selectively link or release the linkage between the first drive module (100) and the second drive module (200) by applying a control signal to the drive linkage module (300).

[0064] The drive linkage module (300) may largely include a planetary reduction unit (310), a driving force conversion unit (320), a brake unit (330), and a clutch unit (340).

[0065] As illustrated in FIG. 1, the planetary reduction gear unit (310) of the drive linkage module (300) is installed at the end of the 1-1 drive shaft (110) of the first drive module (100), and can apply the first driving force (F1) provided from the first electric motor (M1) to the drive shaft (610), or can selectively add at least one of the second driving force (F2) provided from the second electric motor (M2) and the third driving force (F3) provided from the external power source (30) to the first driving force (F1) provided from the first electric motor (M1) and apply the resultant to the drive shaft (610).

[0066] For example, the sun gear (311) of the planetary reduction unit (310) is fixedly installed at the end of the 1-1 drive shaft (110) of the 1st drive module (100) that rotates by the first driving force (F1) provided from the 1st electric motor (M1) as the 1st input shaft to which the 1st driving force (F1) is input, and can rotate together with the 1-1 drive shaft (110).

[0067] In addition, the ring gear (312) of the planetary reduction unit (310) is formed in a ring shape surrounding the sun gear (311) as a second input shaft to which at least one of the second driving force (F2) and the third driving force (F3) is selectively input, and is connected by a gear combination through the second spur gear (322) and the connecting spur gear (322) of the brake unit (330) to be described later, so that it can rotate or stop together with the second spur gear (322).

[0068] In addition, the planetary gear (313) of the planetary reduction unit (310) is an output shaft that outputs a single driving force by the first driving force (F1) or a combined driving force by adding at least one of the second driving force (F2) and the third driving force (F3) to the first driving force (F1), and a plurality of planetary gears are formed between the sun gear (311) and the ring gear (312) to perform an orbital motion and a rotational motion at the same time around the sun gear (311), and are formed coaxially with the 1-1 drive shaft (110) and are connected to the drive shaft (610) by a gear combination through a transmission module (700), and are fixedly installed at the end of the 1-2 drive shaft (120) so as to rotate together with the 1-2 drive shaft (120) by the orbital motion.

[0069] As illustrated in FIG. 1, the driving force conversion unit (320) of the drive linkage module (300) is installed on the second drive shaft (210) of the second drive module (200) and can selectively apply at least one of the second driving force (F2) provided from the second electric motor (M2) and the third driving force (F3) provided from the external power source (30) to the planetary reduction unit (310).

[0070] For example, the first spur gear (321) of the driving force conversion unit (320) is fixedly installed on the second drive shaft (210) of the second drive module (200) that rotates by at least one of the second driving force (F2) provided from the second electric motor (M2) and the third driving force (F3) provided from the external power source (30), and can rotate together with the second drive shaft (210).

[0071] In addition, the second spur gear (322) of the driving force conversion unit (320) may be installed on the second drive shaft (210) so as to be arranged parallel to the first spur gear (321), but may be freely rotatably installed on the second drive shaft (210) so as to be able to rotate or stop independently of the second drive shaft (210).

[0072] This second spur gear (322) is a multi-stage spur gear that can be selectively synchronized with the first spur gear (321) and can form a predetermined gear ratio in combination with the first spur gear (321), and may include a 2-1 spur gear (322a) having the same outer diameter and the same number of gear teeth as the first spur gear (321) and a 2-2 spur gear (322b) having a different outer diameter and a different number of gear teeth than the 2-1 spur gear (322a).

[0073] In addition, the synchronizer (323) of the driving force conversion unit (320) can selectively connect between the 2-1 spur gear (322a) of the second spur gear (322) and the first spur gear (321), which are formed with the same outer diameter and the same number of gear teeth, by sliding movement so that the second spur gear (322) can selectively rotate in synchronization with the first spur gear (321).

[0074] As illustrated in FIG. 1, the brake unit (330) of the drive linkage module (300) is disposed between the first drive module (100) and the second drive module (200), and can stop the transmission of driving force from the second drive module (200) to the first drive module (100).

[0075] For example, the brake unit (330) connects the second spur gear (322) of the driving force conversion unit (320) and the ring gear (312) of the planetary reduction unit (310) by a gear combination so as to transmit driving force between the driving force conversion unit (320) and the planetary reduction unit (310), and can selectively stop the second spur gear (322) and the ring gear (312).

[0076] More specifically, the brake unit (330) may include a rotary shaft (331) that is freely rotatably installed between the driving force conversion unit (320) and the planetary reducer unit (310), a connecting spur gear (332) that is fixedly installed on the rotary shaft (331) and rotates together with the rotary shaft (331) and connects the second spur gear (322) and the ring gear (312) by a gear combination, and a brake (333) that is installed on the rotary shaft (331) to selectively restrict the free rotation of the rotary shaft (331) so as to selectively stop the connecting spur gear (332).

[0077] As illustrated in FIG. 1, the clutch unit (340) of the drive linkage module (300) is installed between the end of the second drive shaft (210) on the second drive module (200) side and the end of the third drive shaft (520) on the power take-off device (500) side, so as to selectively connect or short-circuit the second drive shaft (210) and the third drive shaft (520).

[0078] Below, the power flow according to the driving embodiment of the above-described electric mobility driving system (1000) according to the working state of the electric tractor (10) will be specifically described.

[0079] As illustrated in FIG. 2, an electric tractor (10) according to one embodiment of the present invention can tow a plow (21) as an external work machine (20). The plow (21) includes at least one blade so as to be able to plow and open up land, and can be towed by the electric tractor (10) with at least a portion of the blade inserted into the land.

[0080] This plow (21) is a type of agricultural tool and may be a tool used to plow the land. Since the plow (21) is mainly used to turn the empty land into farmland or to plow the land that has become hardened through repeated farming for a long time and make it fertile, in order to dig up and plow the hard land, an electric tractor (10) that pulls an external work machine (20) on which the plow (21) is installed may require a very large traction force depending on the condition of the land or the size or number of blades included in the plow (21).

[0081] At this time, a third electric motor (M3) connected by a combination of a power take-off device (500) of the electric tractor (10) and a reduction gear (R) may be installed in the external working machine (20) as an external power source (30) that can provide auxiliary driving force to assist the driving (traction) of the electric tractor (10).

[0082] The third electric motor (M3) can receive high-power electric energy from a high-power battery (B) installed in the electric tractor (10) through a DC-Link, and can be a DC motor equipped with an inverter so as to generate rotational power of an appropriate torque according to the size of the auxiliary driving force required by the electric tractor (10).

[0083] The reducer (R) is installed on the external working machine (20) so as to be formed on one side of the third electric motor (M3), receives the rotational power generated from the third electric motor (M3), reduces the rotational power to a predetermined torque and a predetermined rotational speed, and can be applied as the auxiliary driving force to the power take-off device (500) of the electric tractor (10).

[0084] In addition, in this embodiment, although a plow (21) is installed on an external work machine (20) as an example, it is not necessarily limited thereto, and any type of device that can be towed by an electric tractor (10), such as a tow trailer or wagon, may be installed.

[0085] In this way, when a large tractive force is required for the electric tractor (10) according to the external work device (20), the control unit (400) can control the drive linkage module (300) in the driving force assistance mode.

[0086] For example, as illustrated in FIG. 3, in the driving force assistance mode, the second driving force (F2) provided from the second electric motor (M2) can be added to the first driving force (F1) provided from the first electric motor (M1) to assist the driving of the electric tractor (10).

[0087] In addition, as shown in FIG. 4, in the driving force assist mode, when an output (traction force) greater than the sum of the maximum outputs of the first electric motor (M1) and the second electric motor (M2) is required for the electric tractor (10), the second driving force (F2) provided from the second electric motor (M2) and the third driving force (F3) provided from the external power source (30) through the power take-off device (500) can be added to the first driving force (F1) provided from the first electric motor (M1) to assist the driving of the electric tractor (10).

[0088] In this driving force assistance mode, the control unit (400) can apply a control signal to the drive linkage module (300) to link the first drive module (100) and the second drive module (200) so that at least one of the second driving force (F2) and the third driving force (F3) can be added to the first driving force (F1).

[0089] More specifically, as illustrated in FIGS. 3 to 5, the control unit (400) applies a control signal to the drive linkage module (300) so that, in the driving force assistance mode in which auxiliary driving force is applied to the electric tractor (10) to increase the traction force, the second drive module (200) and the first drive module (100) are linked so that at least one of the second driving force (F2) and the third driving force (F3) can be added to the first driving force (F1) as the auxiliary driving force, thereby slidingly moving the synchronizer (323) of the driving force conversion unit (320) to a position in which the first spur gear (321) and the second spur gear (322) can be synchronized, and releasing the brake (333) so that the connecting spur gear (332) of the brake unit (330) can freely rotate and transmit the auxiliary driving force to the first drive module (100).

[0090] In this driving force assist mode, as illustrated in FIG. 3, when the third driving force (F3) is not applied to the second drive shaft (210) of the second drive module (200) through the power take-off device (500) as the auxiliary driving force, the control unit (400) can control the clutch unit (340) to apply a control signal to the drive linkage module (300) so as to short-circuit between the second drive shaft (210) of the second drive module (200) and the third drive shaft (520) of the power take-off device (500).

[0091] Conversely, in the driving force assist mode, as illustrated in FIG. 4, when the third driving force (F3) is applied to the second drive shaft (210) of the second drive module (200) through the power take-off device (500) as the auxiliary driving force, the control unit (400) can control the clutch unit (340) to apply a control signal to the drive linkage module (300) so as to connect the second drive shaft (210) of the second drive module (200) and the third drive shaft (520) of the power take-off device (500).

[0092] Accordingly, in the driving force assistance mode, the second driving force (F2) provided from the second electric motor (M2) is added to the first driving force (F1) provided from the first electric motor (M1) by the control of the drive linkage module (300) of the control unit (400) to assist the driving of the electric tractor (10), or both the second driving force (F2) provided from the second electric motor (M2) and the third driving force (F3) provided from the external power source (30) via the power take-off device (500) are added to the first driving force (F1) provided from the first electric motor (M1) to assist the driving of the electric tractor (10), thereby enabling the electric tractor (10) to smoothly tow an external work machine (20) requiring a large traction force, such as a plow (21).

[0093] As illustrated in FIG. 6, an electric tractor (10) according to another embodiment of the present invention can pull a rotary (22) as an external work machine (20). The rotary (22) includes a rotary blade rotatably installed on the external work machine (20) so as to be able to plow and open up land, and by at least one of a third electric motor (M3) installed as an external power source (30) on the external work machine (20) and a driving force applied from a power take-off device (500) of the electric tractor (10), the rotary blade can be rotated while at least a portion of the rotary blade is inserted into the land, and can be pulled by the electric tractor (10) at the same time.

[0094] This rotary (22) is a type of agricultural tool and can be a tool used to plow the land so that the land can be evenly spread out before planting crops.

[0095] At this time, a third electric motor (M3) connected by a combination of the rotary blade and the reducer (R) can be installed in the external working machine (20) as an external power source (30) that provides driving force for rotating the rotary blade of the rotary (22).

[0096] The third electric motor (M3) can be a DC motor equipped with an inverter so that it can receive high-power electric energy from a high-power battery (B) installed in an electric tractor (10) through a DC-Link and generate rotational power of an appropriate torque according to the size of the driving force required by the rotary (22).

[0097] The reducer (R) is installed on the external work machine (20) so that it can be formed on one side of the third electric motor (M3), receives the rotational power generated from the third electric motor (M3), reduces the rotational power to a predetermined torque and a predetermined rotational speed, and can be applied to the rotary (22) as a driving force for rotating the rotary blade.

[0098] In addition, in this embodiment, although a rotary (22) is installed in an external work machine (20) as an example, it is not necessarily limited to this, and any type of device that can perform agricultural work by a driving force applied from the outside, such as a cultivator, a backhoe, various harvesters, or a spreader, may be installed.

[0099] The rotary (22) is mainly used to turn empty land into farmland or to level the land that has become hardened through repeated farming for a long time by means of the rotating rotary blades. Therefore, in order to dig up and level the hard land, the rotary (22) may require a very large driving force depending on the condition of the land, the number and size of the rotary blades, or the degree to which they are inserted into the land.

[0100] In this way, when a driving force greater than the driving force provided by the third electric motor (M3) installed in the external working machine (20) itself is required for the external working machine (20), the control unit (400) can control the drive linkage module (300) in power take-off mode so that auxiliary driving force can be provided through the power take-off device (500) of the electric tractor (10).

[0101] For example, as shown in FIGS. 6 and 7, in the power take-off mode, the second driving force (F2) provided from the second electric motor (M2) can be output to the external working machine (20) side through the power take-off device (500).

[0102] In this power take-off mode, the control unit (400) can release the linkage between the first drive module (100) and the second drive module (200) by applying a control signal to the drive linkage module (300) so that the second driving force (F2) provided from the second electric motor (M2) can be transferred through the second drive module (200) that transmits the driving force separately from the first drive module (100) and can be taken out toward the external work machine (20) through the power take-off device (500).

[0103] More specifically, as shown in FIGS. 7 and 8, the control unit (400) applies a control signal to the drive linkage module (300) so that, in the power take-off mode in which power is taken out to the external work machine (20) through the power take-off device (500), the linkage between the second drive module (200) and the first drive module (100) is released, so that the first driving force (F1) can be transmitted to the driving shaft (610), and the second driving force (F2) can be transmitted to the external work machine (20) through the power take-off device (500) separately from the first driving force (F1), so that the synchronizer (323) of the driving force conversion unit (320) slides to a position where the first spur gear (321) and the second spur gear (322) can be desynchronized, and the connecting spur gear (332) of the brake unit (330) is restrained, so that the second drive The brake (333) can be operated so that driving force is not transmitted between the module (200) side and the first drive module (100) side.

[0104] In this power take-off mode, as illustrated in FIG. 7, the control unit (400) can control the clutch unit (340) to connect the second drive shaft (210) on the second drive module (200) side and the third drive shaft (520) on the power take-off device (500) side by applying a control signal to the drive linkage module (300) so that the second driving force (F2) transmitted through the second drive module (200) can be applied to the power take-off device (500) side.

[0105] Accordingly, in the power take-off mode, the first driving force (F1) provided from the first electric motor (M1) is applied to the drive shaft (610) for driving (traction) the electric tractor (10) by the control of the drive linkage module (300) of the control unit (400), and separately, the second driving force (F2) provided from the second electric motor (M2) is individually applied to the power take-off device (500) for driving (farming) the external work machine (20) towed by the electric tractor (10), so that when a large driving force is required for the external work machine (20) for farming, additional driving force can be applied to the external work machine (20), thereby smoothly driving the external work machine (20).

[0106] In addition, in the power take-off mode described above, the second driving force (F2) taken out to the external working machine (20) side through the power take-off device (500) is applied as an auxiliary driving force of the external working machine (20) in which the third electric motor (M3) is installed as a separate external power source (30), but it is not necessarily limited thereto, and it is of course also possible to apply it as the main driving force of the external working machine (20) in which the separate external power source (30) is not installed.

[0107] As illustrated in FIG. 9, an electric tractor (10) according to another embodiment of the present invention can pull an external power source (30) in the form of a trailer including an internal combustion engine and a reducer when stopped or running.

[0108] This external power source (30) can generate power for charging the high-power battery (B) of the electric tractor (10) by applying the rotational power (third driving power, F3) provided from the internal combustion engine to the second electric motor (M2) of the electric tractor (10) through the reducer connected to the power take-off device (500), thereby rotating the second electric motor (M2).

[0109] In this way, when the high-power battery (B) of the electric tractor (10) is charged using an external power source (30) pulled by the electric tractor (10) when the electric tractor (10) is stopped or running, the control unit (400) can control the drive linkage module (300) in the power generation mode so that the third driving force (F3) provided from the external power source (30) through the power take-off device (500) of the electric tractor (10) can be applied to the second electric motor (M2).

[0110] For example, as shown in FIGS. 9 and 10, in the power generation mode in which the third driving force (F3) provided from the external power source (30) drives the second electric motor (M2) to generate power, the control unit (400) can release the linkage between the first drive module (100) and the second drive module (200) by applying a control signal to the drive linkage module (300).

[0111] More specifically, as illustrated in FIG. 10, the control unit (400) applies a control signal to the drive linkage module (300) so that, in the power generation mode in which the second electric motor (M2) is driven by the third driving force (F3) applied from the external power source (30) through the power take-off device (500) to generate power, the linkage between the second drive module (200) and the first drive module (100) is released, so that the first driving force (F1) can be transmitted to the drive shaft (610), and the third driving force (F3) can be transmitted to the second electric motor (M2) through the power take-off device (500) separately from the first driving force (F1), thereby slidingly moving the synchronizer (323) of the driving force conversion unit (320) to a position in which the first spur gear (321) and the second spur gear (322) can be desynchronized, and brake The connecting spur gear (332) of the unit (330) can be restrained, so that the brake (333) can be operated so that the driving force is not transmitted between the second drive module (200) side and the first drive module (100) side.

[0112] In this way, in the above-described power generation mode, as illustrated in FIG. 10, the control unit (400) can control the clutch unit (340) by applying a control signal to the drive linkage module (300) so that the third driving force (F3) applied from the external power source (30) through the power take-off device (500) can be applied to the second drive module (200) connected to the second electric motor (M2). This can be done by connecting the second drive shaft (210) on the second drive module (200) side and the third drive shaft (520) on the power take-off device (500) side.

[0113] Accordingly, in the above-described power generation mode, the first driving force (F1) provided from the first electric motor (M1) is applied to the driving shaft (610) for driving (traction) of the electric tractor (10) by the control of the drive linkage module (300) of the control unit (400), and separately, the third driving force (F3) provided from an external power source (30) and applied through the power take-off device (500) is individually applied to the second electric motor (M2), thereby enabling smooth charging of the high-power battery (B) built into the electric tractor (10) when the electric tractor (10) is stopped or running without moving to a separate charging station.

[0114] Accordingly, according to the driving system (1000) of electric mobility and the electric tractor (10) including the same according to various embodiments of the present invention, the first drive module (100) that transmits the first driving force (F1) applied from the first electric motor (M1), and the second drive module (200) that transmits at least one of the second driving force (F2) applied from the second electric motor (M2) and the third driving force (F3) applied from the external power source (30) through the power take-off device (500) have a dual drive structure that can be selectively linked with each other by the drive linkage module (300), so that the driving forces (F1, F2, F3) of each drive module (100, 200) can be used individually or combined as needed, thereby implementing the driving system (1000) of electric mobility.

[0115] Accordingly, when power is taken out to an external work machine (20) such as a rotary (22) through a power take-off device (500) of the electric tractor (10) while the electric tractor (10) is being driven, the drive linkage module (300) releases the linkage between the first drive module (100) and the second drive module (200), thereby enabling the first drive module (100) and the second drive module (200) to individually transmit driving forces (F1, F2), thereby transmitting the first driving force (F1) to the drive shaft (610) of the electric tractor (10) through the first drive module (100), and separately transmitting the second driving force (F2) to the external work machine (20) through the second drive module (200) and the power take-off device (500).

[0116] In addition, when an external work machine (20) such as a plow (21) is towed by the driving of the electric tractor (10), if a situation arises where the external work machine (20) must be used in a limited manner due to insufficient traction power of the electric tractor (10), the drive linkage module (300) links the first drive module (100) and the second drive module (200), and adds at least one of the second driving force (F2) and the third driving force (F3) transmitted through the second drive module (200) to the first driving force (F1) transmitted to the drive shaft (610) of the electric tractor (10) through the first drive module (100), thereby increasing the traction power of the electric tractor (10), thereby resolving the insufficient traction power of the electric tractor (10).

[0117] In addition, when the electric tractor (10) is stopped or moving, the third driving force (F3) provided from the external power source (30) through the power take-off device (500) is transmitted to the second electric motor (M2) through the second drive module (200) that can operate independently from the first drive module (100) by disengaging the drive linkage module (300), thereby driving the second electric motor (M2) to generate power, thereby charging the high-power battery (B) of the electric tractor (10).

[0118] Therefore, by increasing the limit of agricultural work determined by the output of the electric tractor (10) through a dual drive structure that can be selectively linked with each other, the capacity of the electric motors (M1, M2) mounted inside the electric tractor (10) for driving the electric tractor (10) can be reduced, thereby enabling system optimization and lowering the manufacturing cost of the electric tractor (10). In addition, by resolving the cost inefficiency of having to have electric tractors (10) of various capacities from the user's perspective, it is possible to perform high-capacity tractor work with only a single electric tractor (10), and by implementing an electric mobility drive system (1000) and an electric tractor (10) including the same, which can increase agricultural work efficiency by reducing the inconvenience of having to move to a charging station for charging and enabling charging while moving, by using a charging system that uses an external power source (30).

[0119] In addition, in the above-described embodiments, an electric tractor (10) is used as a representative example as an electric mobility (1) to which the electric mobility drive system (1000) is applied, but it is not necessarily limited thereto, and it is obvious that the present invention can be applied to all types of electric mobility (1) that are driven by electric power and have a separate power take-off device, such as an electric truck or electric heavy equipment.

[0120] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A first drive module that connects a first electric motor that provides a first driving force for driving electric mobility and a driving shaft of the electric mobility to transmit the first driving force; A second drive module that provides a second driving force for taking power out to an external work machine through a power take-off device (PTO) of the electric mobility or for assisting the driving of the electric mobility, and is connected between the power take-off device and transmits the second driving force; and A drive linkage module that selectively links or releases between the first drive module and the second drive module by a combination of planetary reduction units so as to add at least one of the second driving force transmitted from the second electric motor to the second drive module side and the third driving force applied from an external power source through the power take-off device and transmitted to the second drive module side to the first driving force on the first drive module side, thereby assisting the driving of the electric mobility; A drive system for electric mobility, including:

2. In paragraph 1, A control unit electrically connected to the drive linkage module and applying a control signal to the drive linkage module so that the first drive module and the second drive module can be selectively linked or released by the drive linkage module; A drive system for electric mobility, further comprising:

3. In paragraph 2, The above control unit, A driving system for electric mobility, wherein, in a driving force assistance mode in which at least one of the second driving force provided from the second electric motor and the third driving force provided from the external power source is added to the first driving force provided from the first electric motor to assist driving of the electric mobility, a control signal is applied to the drive linkage module so that the first drive module and the second drive module can be linked.

4. In paragraph 2, The above control unit, A driving system for electric mobility, wherein a control signal is applied to the drive linkage module so that the linkage between the first drive module and the second drive module can be released in a power take-off mode in which the second driving force provided from the second electric motor is taken out externally through the power take-off device.

5. In paragraph 2, The above control unit, A driving system for electric mobility, wherein a control signal is applied to the drive linkage module so that the linkage between the first drive module and the second drive module can be released in a power generation mode in which the third driving force provided from the external power source drives the second motor to generate electricity.

6. In paragraph 2, The above drive linkage module, The planetary reduction unit is installed on the first drive module and applies the first driving force provided from the first electric motor to the driving shaft side, or selectively adds at least one of the second driving force provided from the second electric motor and the third driving force provided from the external power source to the first driving force provided from the first electric motor and applies the combined driving force to the driving shaft side; and A driving force conversion unit installed on the second drive module and selectively applying at least one of the second driving force provided from the second electric motor and the third driving force provided from the external power source to the planetary reduction unit; A drive system for electric mobility, including:

7. In paragraph 6, The above driving force conversion unit is, A first spur gear fixedly installed on a second drive shaft of the second drive module that rotates by at least one of the second driving force provided from the second electric motor and the third driving force provided from the external power source, and that rotates together with the second drive shaft; A second spur gear is installed on the second drive shaft in parallel with the first spur gear and is freely rotatably installed on the second drive shaft so as to be able to rotate or stop independently of the second drive shaft; and A synchronizer selectively connecting the second spur gear and the first spur gear by sliding movement so that the second spur gear can rotate selectively in synchronization with the first spur gear; A drive system for electric mobility, including:

8. In paragraph 7, The above second spur gear, It is formed as a multi-stage spur gear including a 2-1 spur gear having the same outer diameter and the same number of gear teeth as the 1st spur gear and a 2-2 spur gear having a different outer diameter and a different number of gear teeth than the 2-1 spur gear, The above synchronizer is, A drive system for electric mobility, which selectively connects between the first spur gear and the second-first spur gear formed with the same outer diameter and the same number of gear teeth by sliding movement.

9. In paragraph 7, The above planetary reducer unit, A sun gear which is fixedly installed at the end of the 1-1 drive shaft of the first drive module that rotates by the first driving force provided from the first electric motor as the first input shaft to which the first driving force is input, and which rotates together with the 1-1 drive shaft; A second input shaft into which at least one of the second driving force and the third driving force is selectively input, the second input shaft being formed in a ring shape surrounding the sun gear, and the ring gear being connected to the second spur gear by a gear combination to rotate or stop together with the second spur gear; and An output shaft for outputting a driving force alone by the first driving force or a combined driving force by adding at least one of the second driving force and the third driving force to the first driving force, the output shaft being formed between the sun gear and the ring gear and rotating simultaneously with an orbital motion centered on the sun gear, and a planetary gear fixedly installed at an end of a 1-2 drive shaft that is formed coaxially with the 1-1 drive shaft and connected to the drive shaft by a gear combination, and rotating together with the 1-2 drive shaft by the orbital motion; A drive system for electric mobility, including:

10. In paragraph 6, The above drive linkage module, A brake unit disposed between the first drive module and the second drive module and capable of stopping transmission of driving force from the second drive module to the first drive module; A drive system for electric mobility, further comprising:

11. In paragraph 10, The above brake unit, A driving system for electric mobility, wherein a second spur gear of the driving force conversion unit and a ring gear of the planetary reduction unit are connected by a gear combination so as to transmit driving force between the driving force conversion unit and the planetary reduction unit, and the second spur gear and the ring gear can be selectively stopped.

12. In paragraph 11, The above brake unit, A rotary shaft freely rotatably installed between the driving force conversion unit and the planetary reduction unit; A connecting spur gear fixedly installed on the rotating shaft and rotating together with the rotating shaft, and connecting between the second spur gear and the ring gear by a gear combination; and A brake installed on the above rotating shaft to selectively restrict free rotation of the above rotating shaft; A drive system for electric mobility, including:

13. In paragraph 10, The above control unit, A driving system for electric mobility, wherein, in a driving force assist mode that increases traction by applying auxiliary driving force to the electric mobility, the second drive module and the first drive module are linked, so that at least one of the second driving force and the third driving force can be added to the first driving force as the auxiliary driving force, a control signal is applied to the drive linkage module to slide the synchronizer of the driving force conversion unit to a position where the first spur gear and the second spur gear can be synchronized, and the brake is released so that the connecting spur gear of the brake unit can rotate.

14. In paragraph 13, The above power take-off device is, A PTO shaft that can rotate by being connected to the external working machine or the external power source; and A third drive shaft connected to the PTO shaft by a gear combination so as to rotate with the PTO shaft at a predetermined gear ratio, and having an end selectively connectable to the second drive shaft of the second drive module; A drive system for electric mobility, including:

15. In paragraph 14, The above drive linkage module, A clutch unit installed between an end of the second drive shaft and an end of the third drive shaft, selectively connecting the second drive shaft and the third drive shaft; A drive system for electric mobility, further comprising:

16. In paragraph 15, The above control unit, A driving system for electric mobility, which controls the clutch unit so as to connect the second drive shaft and the third drive shaft by applying a control signal to the drive linkage module when the third driving force is applied as the auxiliary driving force in the driving force assist mode.

17. In paragraph 15, The above control unit, A driving system for electric mobility, which controls the clutch unit so as to short-circuit between the second drive shaft and the third drive shaft by applying a control signal to the drive linkage module when the third driving force is not applied as the auxiliary driving force in the driving force assist mode.

18. In paragraph 10, The above control unit, A drive system for electric mobility, wherein, in a power take-off mode in which power is taken out to the external working machine through the power take-off device, the linkage between the second drive module and the first drive module is released, so that the first driving force can be transmitted to the drive shaft, and the second driving force can be transmitted to the external working machine through the power take-off device separately from the first driving force, by applying a control signal to the drive linkage module, so that the synchronizer of the driving force conversion unit slides to a position in which the first spur gear and the second spur gear can be desynchronized, and the brake is operated so that the connecting spur gear of the brake unit can be restrained.

19. In paragraph 10, The above control unit, A driving system for electric mobility, wherein, in a power generation mode in which the second motor is driven by the third driving force applied from the external power source through the power take-off device to generate power, the linkage between the second drive module and the first drive module is released, so that the first driving force can be transmitted to the drive shaft, and the third driving force can be transmitted to the second motor through the power take-off device separately from the first driving force, by applying a control signal to the drive linkage module, thereby slidingly moving the synchronizer of the driving force conversion unit to a position in which the first spur gear and the second spur gear can be desynchronized, and operating the brake so that the connecting spur gear of the brake unit can be restrained.

20. A driving body capable of performing agricultural work or towing an external work machine that can assist in performing said agricultural work; A first electric motor installed in the driving body and providing a first driving force for driving the driving body; A second electric motor installed in the driving body to provide a second driving force for power take-off to the external work machine through a power take-off device (PTO) or for assisting the driving of the driving body; and A driving system for electric mobility according to any one of claims 1 to 19, which is installed on the driving body and can selectively increase the traction force of the driving body by selectively adding at least one of the second driving force and the third driving force applied from the external power source through the power take-off device to the first driving force; Electric tractor, including.

Images