Power transmission device for hybrid vehicle

Abstract

The present application provides a power transmission apparatus for a hybrid vehicle, the power transmission apparatus for a hybrid vehicle including: an engine configured to generate power; an input connected with the engine and configured to provide two-speed power using different gear ratios; a first motor generator that is driven when power is applied; a first transmission coupled to the first motor generator, positioned parallel to the input and configured to transmit power to the input; the output end is connected with the input end; a second motor generator that is driven when power is applied; a second transmission connected with the second motor generator, positioned parallel to the output and configured to transmit power to the output; and a differential engaged with the output end and configured to provide power to wheels. According to the present disclosure, an input connected to an engine is constantly connected with a first motor generator to transmit rotational force, and optionally connected with an output to transmit rotational force.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure relate to a power transmission device for a hybrid vehicle, and more particularly, to a power transmission device for a hybrid vehicle capable of removing a clutch connecting engine power, ensuring space for first and second motors, and reducing the overall length. Background Art

[0002] Generally, a power transmission device for a hybrid vehicle has a layout in which a motor, an engine, and an integrated starter generator (ISG) are arranged in a line.

[0003] In hybrid vehicles that utilize an engine and an electric motor, the electric motor is used to facilitate the initial start of the vehicle. Once the vehicle reaches a certain speed, the generator or ISG starts the engine, using both the engine's output and the electric motor's output.

[0004] The motor used in the power transmission device for a hybrid vehicle may be driven when the engine is initially not running to achieve electric driving of the vehicle.

[0005] Recently, the number of motors is no longer limited to one. Instead, two or more motors are being installed in multiples. For example, when two motors are installed in a power transmission device for a hybrid vehicle, the first motor can be driven to start the engine, and the second motor can be driven to electrically propel the vehicle.

[0006] However, existing technologies require large motors to deliver the required torque, making layout design difficult. Installing a friction clutch on the power shaft connecting the engine and transmission increases product length and weight due to its large size. Furthermore, a dog clutch on the power shaft connecting the engine and transmission requires the motor to be positioned concentrically with the engine, which limits overall length. Therefore, a solution to this problem was necessary.

[0007] Background art of the present disclosure is disclosed in Korean Patent Application Publication No. 2009-0020791 (published on February 27, 2009, entitled “POWER TRANSMISSION DEVICE FOR HEV”). Summary of the Invention

[0008] Various embodiments are directed to a power transmission device for a hybrid vehicle capable of removing a clutch connecting engine power, securing space for first and second motors, and reducing the overall length.

[0009] In an embodiment, a power transmission device for a hybrid vehicle includes: an engine configured to generate power; an input end connected to the engine and configured to provide two-speed power using different gear ratios; a first motor generator driven when power is applied; a first transmission connected to the first motor generator, positioned parallel to the input end and configured to transmit power to the input end; an output end engaged with the input end; a second motor generator driven when power is applied; a second transmission connected to the second motor generator, positioned parallel to the output end and configured to transmit power to the output end; and a differential engaged with the output end and configured to provide power to the wheels.

[0010] The input end may include an input shaft connected to the engine; a constant input gear constantly connected to the input shaft and engaged with the first transmission; and a selectable input gear selectably connected to the input shaft and engaged with the output end.

[0011] The optional input gear may include: a first optional gear, which is located concentrically with the input shaft and engaged with the output end; a second optional gear, which is located concentrically with the input shaft, engaged with the output end and is configured to have a different gear ratio from the first optional gear; and a third optional shifting device, which is provided on the input shaft and is selectively engaged with the first optional gear and the second optional gear.

[0012] The first transmission may include: a first transmission shaft connected to the first motor generator and positioned in parallel with the input shaft; and a first transmission gear provided on the first transmission shaft and engaged with the constant input gear.

[0013] The output end may include: an output shaft located between the input end and the second transmission; a first output transfer gear provided on the output shaft and configured to connect the second transmission to one of the first optional gear and the second optional gear; a second output transfer gear provided on the output shaft and connected to the other of the first optional gear and the second optional gear; and an output differential gear provided on the output shaft and connected to the differential.

[0014] The second transmission may include: a second transmission shaft connected to the second motor generator and positioned parallel to the input shaft; and a second transmission gear provided on the second transmission shaft and engaged with the first output transmission gear.

[0015] The differential may include a differential gear configured to provide power to wheels; and a differential link disposed on the differential gear and engaged with the output differential gear.

[0016] In a power transmission device for a hybrid vehicle according to the present disclosure, an input terminal connected to the engine is constantly connected to a first motor-generator for transmitting rotational force, and is selectively connected to an output terminal for transmitting rotational force. The output terminal can be constantly connected to a second motor-generator for transmitting rotational force, and is constantly connected to a differential for transmitting rotational force. The input terminal, a first transmission connected to the first motor-generator, and a second transmission connected to the second motor-generator are positioned parallel to each other, thereby reducing the overall length. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram illustrating a power transmission apparatus for a hybrid vehicle according to an embodiment of the present disclosure.

[0018] Figure 2 It is shown by Figure 1 Schematic diagram of the first gear driving performed by the engine and the power generation mode of the first motor generator.

[0019] Figure 3 It is shown by Figure 1 Schematic diagram of the second gear driving performed by the engine and the power generation mode of the first motor generator.

[0020] Figure 4 It is shown by Figure 1 Schematic diagram of a first gear driving mode executed by the engine and the first motor generator.

[0021] Figure 5 It is shown by Figure 1 Schematic diagram of the second gear driving mode executed by the engine and the first motor generator.

[0022] Figure 6 It is shown by Figure 1 Schematic diagram of the first gear driving performed by the engine and the power generation mode of the second motor generator.

[0023] Figure 7 It is shown by Figure 1 Schematic diagram of the second gear driving performed by the engine and the power generation mode of the second motor generator.

[0024] Figure 8 It is shown by Figure 1 Schematic diagram of the first gear driving mode executed by the engine and the second motor generator.

[0025] Figure 9 It is shown by Figure 1 Schematic diagram of the second gear driving mode executed by the engine and the second motor generator.

[0026] Figure 10 It shows Figure 1Schematic diagram of the power generation mode of the first motor generator.

[0027] Figure 11 It is shown by Figure 1 Schematic diagram of the driving mode performed by the second motor generator.

[0028] Figure 12 It is shown by Figure 1 Schematic diagram of a first gear driving mode executed by an engine, a first motor generator and a second motor generator.

[0029] Figure 13 It is shown by Figure 1 Schematic diagram of the second gear driving mode executed by the engine, the first motor generator and the second motor generator. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of a power transmission device for a hybrid vehicle according to the present disclosure will be described in detail with reference to the accompanying drawings. For clarity and convenience, the thickness of lines, dimensions of components, and the like may be shown in the figures without being drawn to exact proportions. Furthermore, the terms used below are defined with regard to their functions within the present disclosure and may vary depending on the user's or operator's intentions or common practices. Therefore, these terms should be defined according to the context of this specification.

[0031] Figure 1 Schematic diagram showing a power transmission device for a hybrid vehicle according to an embodiment of the present disclosure. Figure 1 The power transmission device 1 for a hybrid vehicle according to an embodiment of the present disclosure includes an engine 10 , an input end 20 , a first motor generator 30 , a first transmission 40 , an output end 50 , a second motor generator 60 , a second transmission 70 and a differential 80 .

[0032] Engine 10 is a device that generates power by driving an internal combustion engine. Input 20 can be connected to engine 10 and configured to provide dual-speed power with different gear ratios. For example, input 20 can be in the form of a shaft and positioned between first transmission 40 and second transmission 70. Input 20 can transmit power for low-speed (first gear) or high-speed (second gear) driving.

[0033] The first motor generator 30 is driven when power is applied, and the first transmission 40 may be connected to the first motor generator 30. The first transmission 40 may be positioned parallel to the input end 20 and transmit power to the input end 20. For example, the first motor generator 30 may rotate the first transmission 40 to start the engine 10 and provide driving force. When the rotational force of the input end 20 is provided to the first motor generator 30 through the first transmission 40, the first motor generator 30 may generate electricity.

[0034] The output end 50 may be engaged with the input end 20. For example, the output end 50 may be located between the input end 20 and the second transmission 70. The input end 20, the output end 50, and the second transmission 70 may be positioned in parallel.

[0035] The second motor generator 60 is driven when power is applied, and the second transmission 70 may be connected to the second motor generator 60. The second transmission 70 may transmit power to the output end 50. For example, the second motor generator 60 may rotate the second transmission 70 to provide driving force. When the rotational force of the output end 50 is provided to the second motor generator 60 through the second transmission 70, the second motor generator 60 may generate electricity.

[0036] The differential 80 can be coupled to the output end 50 to provide power to the wheels. For example, the differential 80 can be a differential gear that divides and distributes the driving force of the left and right wheels to achieve different rotations on the left and right sides.

[0037] The input end 20 according to an embodiment of the present disclosure may include an input shaft 21 , a constant input gear 22 , and an optional input gear 23 .

[0038] The input shaft 21 may be connected to the engine 10. For example, the input shaft 21 may be directly connected to the engine 10 and rotate around an axis when the engine 10 is driven. The input shaft 21 may be located between the first transmission 40 and the output end 50.

[0039] The constant input gear 22 may be constantly connected to the input shaft 21. The constant input gear 22 may be engaged with the first transmission 40. For example, the constant input gear 22 may be constantly connected with the first transmission 40 to transmit power.

[0040] The optional input gear 23 may be optionally connected to the input shaft 21 and engaged with the output end 50. For example, the optional input gear 23 may be automatically or manually connected to the input shaft 21 to transmit rotational force, or may be spaced apart from the input shaft 21 to limit rotational force transmission.

[0041] The selectable input gear 23 may be located closer to the engine 10 than the constant input gear 22 .

[0042] The selectable input gear 23 according to the embodiment of the present disclosure may include a first selectable gear 231 , a second selectable gear 232 , and a third selectable shift device 233 .

[0043] The first selectable gear 231 may be positioned concentrically with the input shaft 21 and engaged with the output end 50. For example, the first selectable gear 231 may be rotatably supported in a housing (not shown), and the input shaft 21 may be inserted through the first selectable gear 231.

[0044] The second selectable gear 232 may be positioned concentrically with the input shaft 21 and engaged with the output end 50. The second selectable gear 232 may have a different gear ratio than the first selectable gear 231. For example, the second selectable gear 232 may be rotatably supported in a housing (not shown), and the input shaft 21 may be inserted through the second selectable gear 232. The first selectable gear 231 may transmit power for low-speed travel, and the second selectable gear 232 may transmit power for high-speed travel.

[0045] The third optional shifting device 233 can be provided on the input shaft 21 and selectively engage with the first optional gear 231 and the second optional gear 232. For example, the third optional shifting device 233 can be permanently connected to the input shaft 21. The third optional shifting device 233 can be connected to or disconnected from the first optional gear 231 in response to an operation signal. The third optional shifting device 233 can be connected to or disconnected from the second optional gear 232 in response to an operation signal. When the third optional shifting device 233 is connected to the first optional gear 231, the rotational force of the input shaft 21 can be transmitted to the first optional gear 231. When the third optional shifting device 233 is connected to the second optional gear 232, the rotational force of the input shaft 21 can be transmitted to the second optional gear 232. When the third optional shifting device 233 is disconnected from the first optional gear 231, the rotational force of the input shaft 21 may not be transmitted to the first optional gear 231. When the third selectable shift device 233 is disconnected from the second selectable gear 232 , the rotational force of the input shaft 21 may not be transmitted to the second selectable gear 232 .

[0046] The first transmission 40 according to the embodiment of the present disclosure may include a first transmission shaft 41 and a first transmission gear 42 .

[0047] The first transmission shaft 41 may be connected to the first motor generator 30 and positioned parallel to the input shaft 21. For example, the first transmission shaft 41 may be connected to a rotation shaft provided in the first motor generator 30 or be configured to extend from the rotation shaft.

[0048] The first transmission gear 42 may be provided on the first transmission shaft 41 and configured to maintain engagement with the constant input gear 22. For example, the first transmission gear 42 and the constant input gear 22 may maintain constant connection, thereby enabling transmission of rotational force.

[0049] The output end 50 according to the embodiment of the present disclosure may include an output shaft 51 , a first output transmission gear 52 , a second output transmission gear 53 , and an output differential gear 54 .

[0050] The output shaft 51 may be located between the input end 20 and the second transmission 70. For example, the output shaft 51 may be rotatably supported in a housing (not shown), and the input shaft 21, the output shaft 51, and the second transmission 70 may be positioned in parallel.

[0051] The first output transmission gear 52 may be provided on the output shaft 51 and configured to connect the second transmission 70 to one of the first selectable gear 231 and the second selectable gear 232. For example, the first output transmission gear 52 may be constantly connected to the first selectable gear 231 for low-speed travel. For example, the first output transmission gear 52 may be constantly connected to the second transmission 70.

[0052] The second output transmission gear 53 may be provided on the output shaft 51 and connected to the other of the first optional gear 231 and the second optional gear 232. For example, the second output transmission gear 53 may be constantly connected to the second optional gear 232 responsible for high-speed running.

[0053] The output differential gear 54 may be disposed on the output shaft 51 and connected to the differential 80. For example, the output differential gear 54 may be located between the first output transmission gear 52 and the second output transmission gear 53.

[0054] The second transmission 70 according to the embodiment of the present disclosure may include a second transmission shaft 71 and a second transmission gear 72 .

[0055] The second transmission shaft 71 may be connected to the second motor generator 60 and positioned parallel to the input shaft 21. For example, the second transmission shaft 71 may be connected to a rotation shaft provided in the second motor generator 60 or be configured to extend from the rotation shaft.

[0056] The second transmission gear 72 may be provided on the second transmission shaft 71 and engaged with the first output transmission gear 52. For example, the second transmission gear 72 may be constantly connected with the first output transmission gear 52 to transmit power.

[0057] The differential 80 according to the embodiment of the present disclosure may include a differential gear 81 and a differential link 82 .

[0058] The differential gear 81 can provide power to the wheels. For example, the differential gear 81 can be a differential gear that distributes power to the left and right wheels.

[0059] The differential connection member 82 may be provided on the differential gear 81 and engaged with the output differential gear 54. For example, the differential connection member 82 may be rotatably mounted in a housing (not shown) and be constantly connected to the output differential gear 54. The differential connection member 82 may transmit the rotational force of the output differential gear 54 to the differential gear 81.

[0060] Figure 2 It is shown by Figure 1 Schematic diagram of the first gear driving mode performed by the engine and the power generation mode of the first motor generator. Figure 2 When the engine 10 is driven, the third selectable shifting device 233 is connected to the first selectable gear 231. When the engine 10 is driven, the rotational force of the input shaft 21 is transmitted to the first output transmission gear 52 via the selectable input gear 23, causing the output shaft 51 to rotate. When the output shaft 51 rotates, the differential 80, which is connected to the output differential gear 54, rotates, providing first gear drive force to the wheels. When the input shaft 21 rotates, the first transmission 40 can rotate via the constant input gear 22, allowing the first motor generator 30 to generate electricity.

[0061] Figure 3 It is shown by Figure 1 Schematic diagram of the second gear driving mode performed by the engine and the power generation mode of the first motor generator. Figure 3 When the engine 10 is driven, the third selectable shifting device 233 is connected to the second selectable gear 232. When the engine 10 is driven, the rotational force of the input shaft 21 is transmitted to the second output transmission gear 53 via the selectable input gear 23, causing the output shaft 51 to rotate. When the output shaft 51 rotates, the differential 80, which is connected to the output differential gear 54, rotates, providing the second gear drive force to the wheels. When the input shaft 21 rotates, the first transmission 40 can rotate via the constant input gear 22, allowing the first motor generator 30 to generate electricity.

[0062] Figure 4 It is shown by Figure 1 Schematic diagram of the first gear driving mode executed by the engine and the first motor generator. Figure 4 When the engine 10 and the first motor generator 30 are driven, the third selectable shifting device 233 is connected to the first selectable gear 231. The driving force of the engine 10 rotates the input shaft 21. In addition, when the first transmission 40 is rotated by driving the first motor generator 30, the rotational force of the first transmission 40 is transmitted to the input shaft 21. The rotational force of the input shaft 21 is transmitted to the first output transmission gear 52 via the selectable input gear 23, rotating the output shaft 51. When the output shaft 51 rotates, the differential 80 connected to the output differential gear 54 rotates, providing the first gear drive force to the wheels.

[0063] Figure 5 It is shown by Figure 1 Schematic diagram of the second gear driving mode executed by the engine and the first motor generator. Figure 5When the engine 10 and the first motor generator 30 are driven, the third selectable shifting device 233 is connected to the second selectable gear 232. The driving force of the engine 10 rotates the input shaft 21. Furthermore, when the first transmission 40 is rotated by driving the first motor generator 30, the rotational force of the first transmission 40 is transmitted to the input shaft 21. The rotational force of the input shaft 21 is transmitted to the second output transmission gear 53 via the selectable input gear 23, rotating the output shaft 51. When the output shaft 51 rotates, the differential 80 connected to the output differential gear 54 rotates, providing the second gear drive force to the wheels.

[0064] Figure 6 It is shown by Figure 1 Schematic diagram of the first gear driving mode performed by the engine and the power generation mode of the second motor generator. Figure 6 When the engine 10 is driven, the third selectable shifting device 233 is connected to the first selectable gear 231. When the engine 10 is driven, the rotational force of the input shaft 21 is transmitted to the first output transmission gear 52 via the selectable input gear 23, causing the output shaft 51 to rotate. When the output shaft 51 rotates, the differential 80, which is connected to the output differential gear 54, rotates, providing first-gear drive force to the wheels. When the output shaft 51 rotates, the second transmission 70 can rotate via the first output transmission gear 52, allowing the second motor generator 60 to generate electricity.

[0065] Figure 7 It is shown by Figure 1 Schematic diagram of the second gear driving mode performed by the engine and the power generation mode of the second motor generator. Figure 7 When the engine 10 is driven, the third selectable shifting device 233 is connected to the second selectable gear 232. When the engine 10 is driven, the rotational force of the input shaft 21 is transmitted to the second output transmission gear 53 via the selectable input gear 23, causing the output shaft 51 to rotate. When the output shaft 51 rotates, the differential 80, which is connected to the output differential gear 54, rotates, providing the second gear drive force to the wheels. When the output shaft 51 rotates, the second transmission 70 can rotate via the first output transmission gear 52, allowing the second motor generator 60 to generate electricity.

[0066] Figure 8 It is shown by Figure 1 Schematic diagram of the first gear driving mode executed by the engine and the second motor generator. Figure 8When the engine 10 and the second motor-generator 60 are driven, the third selectable shifting device 233 is connected to the first selectable gear 231. The driving force of the engine 10 rotates the input shaft 21. When the input shaft 21 rotates, the rotational force of the selectable input gear 23 is transmitted to the output shaft 51 via the first output transfer gear 52. In addition, when the second transmission 70 rotates by driving the second motor-generator 60, the rotational force of the second transfer shaft 71 is transmitted to the output shaft 51 via the second transfer gear 72. The rotational force of the output shaft 51 is transmitted to the differential 80 via the output differential gear 54, providing the first gear drive force to the wheels.

[0067] Figure 9 It is shown by Figure 1 Schematic diagram of the second gear driving mode executed by the engine and the second motor generator. Figure 9 When the engine 10 and the second motor-generator 60 are driven, the third selectable shifting device 233 is connected to the second selectable gear 232. The driving force of the engine 10 rotates the input shaft 21. When the input shaft 21 rotates, the rotational force of the selectable input gear 23 is transmitted to the output shaft 51 via the second output transfer gear 53. Furthermore, when the second transmission 70 rotates due to the driving of the second motor-generator 60, the rotational force of the second transfer shaft 71 is transmitted to the output shaft 51 via the second transfer gear 72. The rotational force of the output shaft 51 is transmitted to the differential 80 via the output differential gear 54, providing the second gear drive force to the wheels.

[0068] Figure 10 It shows Figure 1 Schematic diagram of the power generation mode of the first motor generator. Figure 10 When the engine 10 is driven, the third selectable shift device 233 is disconnected from the first selectable gear 231 and the second selectable gear 232. When the engine 10 is driven, the rotational force of the input shaft 21 can be transmitted to the first transmission 40 through the constant input gear 22, so that the first motor generator 30 can generate electricity.

[0069] Figure 11 It is shown by Figure 1 Schematic diagram of the driving mode performed by the second motor generator in FIG. Figure 11 When the engine 10 is stopped, the second transmission 70 is rotated by driving the second motor generator 60, and the rotational force of the second transmission shaft 71 is transmitted to the output shaft 51 through the second transmission gear 72. The rotational force of the output shaft 51 is transmitted to the differential 80 through the output differential gear 54 to provide driving force to the wheels.

[0070] Figure 12 It is shown by Figure 1 Schematic diagram of the first gear driving mode executed by the engine, the first motor generator and the second motor generator. Figure 12 When the engine 10, the first motor generator 30, and the second motor generator 60 are driven, the third selectable shift device 233 is connected to the first selectable gear 231. The driving force of the engine 10 rotates the input shaft 21. In addition, when the first transmission 40 is rotated by driving the first motor generator 30, the rotational force of the first transmission 40 is transmitted to the input shaft 21. The rotational force of the input shaft 21 is transmitted to the first output transmission gear 52 through the selectable input gear 23 to rotate the output shaft 51. When the second transmission 70 is rotated by driving the second motor generator 60, the rotational force of the second transmission shaft 71 is transmitted to the output shaft 51 through the second transmission gear 72. When the output shaft 51 rotates, the differential 80 connected to the output differential gear 54 rotates to provide the first gear driving force to the wheels.

[0071] Figure 13 It is shown by Figure 1 Schematic diagram of the second gear driving mode executed by the engine, the first motor generator and the second motor generator. Figure 13 When the engine 10, the first motor generator 30, and the second motor generator 60 are driven, the third selectable shift device 233 is connected to the second selectable gear 232. The driving force of the engine 10 rotates the input shaft 21. In addition, when the first transmission 40 is rotated by driving the first motor generator 30, the rotational force of the first transmission 40 is transmitted to the input shaft 21. The rotational force of the input shaft 21 is transmitted to the second output transmission gear 53 through the selectable input gear 23 to rotate the output shaft 51. When the second transmission 70 is rotated by driving the second motor generator 60, the rotational force of the second transmission shaft 71 is transmitted to the output shaft 51 through the second transmission gear 72. When the output shaft 51 rotates, the differential 80 connected to the output differential gear 54 rotates to provide the second gear driving force to the wheels.

[0072] In the power transmission device 1 for a hybrid vehicle according to an embodiment of the present disclosure, an input terminal 20 connected to an engine 10 is constantly connected to a first motor generator 30 for transmitting rotational force, and is optionally connected to an output terminal 50 for transmitting rotational force. The output terminal 50 can be constantly connected to a second motor generator 60 for transmitting rotational force, and is constantly connected to a differential 80 for transmitting rotational force. The input terminal 20, the first transmission 40 connected to the first motor generator 30, and the second transmission 70 connected to the second motor generator 60 are positioned parallel to each other, thereby reducing the overall length.

[0073] The present disclosure has been described with reference to the embodiments shown in the accompanying drawings. Although the embodiments are disclosed for illustrative purposes, it will be apparent to those skilled in the art that various modifications and equivalent embodiments are possible.

Claims

1. A power transmission device for a hybrid vehicle, comprising: an engine, constructed to produce power; an input end connected to the engine and configured to provide dual-speed power using different gear ratios; a first motor-generator driven when power is applied; a first transmission connected to the first motor-generator, positioned parallel to the input end and configured to transmit power to the input end; an output terminal connected to the input terminal; a second motor-generator that is driven when power is applied; a second transmission connected to the second motor-generator, positioned parallel to the output end and configured to transmit power to the output end; as well as A differential is engaged with the output end and is configured to provide power to the wheels.

2. The power transmission device for a hybrid vehicle according to claim 1, wherein The input terminal includes: an input shaft connected to the engine; a constant input gear constantly connected to the input shaft and engaged with the first transmission; and An optional input gear is selectively connected to the input shaft and engaged with the output end.

3. The power transmission device for a hybrid vehicle according to claim 2, wherein: The optional input gears include: a first selectable gear positioned concentrically with the input shaft and engaged with the output; a second selectable gear positioned concentrically with the input shaft, engaged with the output and configured to have a different gear ratio than the first selectable gear; and A third selectable shifting device is disposed on the input shaft and is selectively engaged with the first selectable gear and the second selectable gear.

4. The power transmission device for a hybrid vehicle according to claim 2, wherein: The first transmission comprises: a first transmission shaft connected to the first motor generator and positioned parallel to the input shaft; and A first transmission gear is provided on the first transmission shaft and engaged with the constant input gear.

5. The power transmission device for a hybrid vehicle according to claim 3, wherein The output terminal includes: an output shaft located between the input end and the second transmission; a first output transfer gear disposed on the output shaft and configured to connect the second transmission with one of the first selectable gear and the second selectable gear; a second output transmission gear disposed on the output shaft and connected to the other of the first selectable gear and the second selectable gear; and An output differential gear is provided on the output shaft and connected to the differential.

6. The power transmission device for a hybrid vehicle according to claim 5, wherein: The second transmission comprises: a second transmission shaft connected to the second motor generator and positioned parallel to the input shaft; and A second transmission gear is provided on the second transmission shaft and engaged with the first output transmission gear.

7. The power transmission device for a hybrid vehicle according to claim 5, wherein: The differential comprises: a differential gear configured to provide power to the wheels; and A differential connecting member is provided on the differential gear and engaged with the output differential gear.

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