A hybrid vehicle-specific gearbox and a hybrid vehicle having the same

Abstract

The present invention provides a hybrid vehicle-specific gearbox and a hybrid vehicle including the same, comprising an engine, a drive motor, a generator, a planetary gear set, a clutch, a differential, a speed reducer, an input outer shaft, and an input inner shaft: the generator is arranged between the planetary gear set and the clutch, and the drive motor is arranged between the clutch and the engine; a first end of the input outer shaft is fixedly connected to the drive motor, a second end of the input outer shaft extends toward the engine, and the drive motor is fixedly connected to the input outer shaft; a first end of the input inner shaft is fixedly connected to the planetary gear set, and a second end of the input inner shaft passes through the generator rotor, the clutch, and the drive motor rotor in sequence before being connected to the engine; the speed reducer is connected to the input outer shaft between the drive motor and the engine, and the differential is fixedly connected to the speed reducer. The gearbox of the present invention can achieve a coaxial arrangement of two motors, saving axial space while effectively avoiding the problem of poor bearing lubrication between the inner and outer shafts.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile transmission equipment, and in particular relates to a gearbox dedicated to a hybrid electric vehicle and a hybrid electric vehicle having the same. Background Art

[0002] As calls for global environmental protection intensify, the development of new energy vehicles is gaining increasing attention. Against this backdrop, major automakers have launched a variety of hybrid vehicles boasting energy-saving and low-emission features. These hybrid vehicles utilize an internal combustion engine and electrodes as their power source, combining the advantages of an engine's high power, quick response, and long operating time with the pollution-free and low-noise characteristics of an electric motor, achieving an optimal match between the two. However, current hybrid transmissions are mostly parallel-axis designs, resulting in a bulky design that complicates front-cabin layout, squeezes other vehicle components, and hinders the development of comfortable models. Summary of the Invention

[0003] To address the above-mentioned issues, the present invention provides a hybrid vehicle-specific gearbox and a hybrid vehicle equipped with the same. By arranging two motors coaxially, sharing the stator winding space of the two motors, and using the same reducer for the engine and drive motor, the gearbox can effectively save axial layout space, improve power transmission efficiency, and ensure the compactness of the gearbox structure. The objectives of the present invention are achieved through the following technical solutions:

[0004] A gearbox dedicated to hybrid electric vehicles, comprising an engine, a drive motor, a generator, a planetary gear set, a clutch, a differential, a reducer, an input outer shaft and an input inner shaft: the generator is arranged between the planetary gear set and the clutch, and the drive motor is arranged between the clutch and the engine; the first end of the input outer shaft is fixedly connected to the drive motor, the second end of the input outer shaft extends toward the engine, and the drive motor is fixedly connected to the input outer shaft; the first end of the input inner shaft is fixedly connected to the planetary gear set, and the second end of the input inner shaft passes through the generator rotor, the clutch, and the drive motor rotor in sequence and then connects to the engine; the reducer is connected to the input outer shaft between the drive motor and the engine, and the differential is fixedly connected to the reducer.

[0005] Furthermore, the reducer includes a first-stage reducer and a main reducer, the first-stage reducer includes a first-stage reduction main gear and a first-stage reduction slave gear, the main reducer includes a main reduction main gear and a main reduction slave gear, the first-stage reduction main gear is fixedly connected to the input outer shaft, and the first-stage reduction slave gear is meshed with the first-stage reduction main gear; the first-stage reduction slave gear is connected to the main reduction main gear through the output shaft, and the main reduction main gear is meshed with the main reduction slave gear; the differential is fixedly connected to the main reduction slave gear.

[0006] Furthermore, a shock absorber is connected between the engine and the drive motor, and the second end of the input inner shaft is connected to the shock absorber; the reducer is fixed on the input outer shaft between the shock absorber and the drive motor.

[0007] Furthermore, the planetary gear set includes a sun gear, an inner ring gear, planetary gears and a planet carrier; the generator includes a generator stator, a generator rotor and a generator shaft; the generator shaft is fixed to the generator rotor, the first end of the generator shaft is fixedly connected to the sun gear, and the second end is fixedly connected to the clutch; the first end of the input inner shaft is fixedly connected to the planet carrier, and the input inner shaft passes through the planet carrier, the sun gear, the generator shaft, the clutch, and the input outer shaft in a direction extending from the first end to the second end, and is then connected to the shock absorber.

[0008] Furthermore, the drive motor includes a drive motor stator, a drive motor rotor and a drive motor shaft. The drive motor shaft is coaxially fixedly connected to the input outer shaft, and the input inner shaft axially passes through the axis of the drive motor shaft.

[0009] Furthermore, the clutch adopts a friction clutch or a wet multi-plate clutch.

[0010] Furthermore, the gearbox is configured with at least a pure electric drive mode, an engine start mode, a power generation mode, a series drive mode and an engine direct drive mode.

[0011] The present invention further provides a hybrid electric vehicle having the hybrid electric vehicle-specific transmission as described above.

[0012] The beneficial effects of the present invention are:

[0013] (1) The dual motors are coaxially arranged, and the clutch is arranged between the drive motor and the generator, which can fully utilize the stator winding space of the two motors; the engine and the drive motor share the same two-stage reduction gears, without additional gears; the generator speed increase gear adopts a planetary gear set to achieve coaxial arrangement, saving axial space.

[0014] (2) The engine drive uses the generator speed-increasing gear to achieve different speed ratios between the engine and the drive motor, thereby achieving the engine direct drive operating mode in the fuel economy zone;

[0015] (3) The two input shafts are coaxially arranged, but the input inner shaft only uses external bearings at both ends, which can effectively avoid the problem of poor bearing lubrication between the inner and outer shafts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a schematic diagram of a first embodiment of the present invention;

[0017] Figure 2 Shown is a schematic diagram of a second embodiment of the present invention;

[0018] In the picture:

[0019] 100-engine; 700-reducer; G12-input inner shaft front bearing;

[0020] 200-drive motor; 701-first stage reduction main gear; G21-drive motor rear bearing;

[0021] 201-drive motor rotor; 702-first-stage reduction gear; G22-drive motor front bearing;

[0022] 202-drive motor stator; 703-output shaft; G23-input outer shaft front bearing;

[0023] 300-friction clutch; 704-final reduction gear; G45-generator rear bearing;

[0024] 300'-tooth clutch; 705-main reduction gear; G43-generator front bearing;

[0025] 400-generator; 800-differential; G71-input shaft rear bearing;

[0026] 401-generator rotor; X1-input inner shaft; G72-input shaft front bearing;

[0027] 402-generator stator; X2-input outer shaft; G81-differential rear bearing;

[0028] 500-Planetary gear set; G11-Input inner shaft rear bearing; G82-Differential front bearing.

[0029] 600-torsional vibration damper; DETAILED DESCRIPTION

[0030] The following, in conjunction with the accompanying drawings, provides a clear and complete description of the technical solutions for a hybrid vehicle transmission and hybrid vehicle according to preferred embodiments of the present invention. Obviously, the described embodiments represent only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0031] Example 1:

[0032] This embodiment provides a hybrid electric vehicle gearbox, which includes an engine 100, a drive motor 200, a generator 400, a planetary gear set 500, a friction clutch 300, a differential 800, a speed reducer 700, an input outer shaft X2, and an input inner shaft X1: the generator 400 is arranged between the planetary gear set 500 and the friction clutch 300, the drive motor 200 is arranged between the friction clutch 300 and the engine 100; the first end of the input outer shaft X2 is fixedly connected to the drive motor 200, and the input inner shaft X1 is fixedly connected to the drive motor 200. The second end of the shaft X2 extends toward the engine, and the drive motor 200 is fixedly connected to the input outer shaft X2; the first end of the input inner shaft X1 is fixedly connected to the planetary gear set 500, and the second end of the input inner shaft X2 passes through the generator rotor, the clutch, and the drive motor rotor in sequence and then connects to the engine; the reducer 700 is connected to the input outer shaft X2 between the drive motor 200 and the engine 100, and the differential 800 is fixedly connected to the reducer 700, and the differential 800 is supported by the differential front bearing G82 and the differential rear bearing G81.

[0033] Figure 1 In the illustrated embodiment, the reducer 700 adopts a two-stage reducer. As shown in the figure, the two-stage reducer includes a first-stage reducer and a main reducer. The first-stage reducer includes a first-stage reduction main gear 701 and a first-stage reduction slave gear 702. The main reducer includes a main reduction main gear 704 and a main reduction slave gear 705. The first-stage reduction main gear 701 is fixedly connected to the input outer shaft X2, and the first-stage reduction slave gear 702 is meshed with the first-stage reduction main gear 701; the first-stage reduction slave gear 702 is connected to the main reduction main gear 704 through the output shaft 703, and the two ends of the output shaft 703 are radially and axially supported by the output shaft front bearing G72 and the output shaft rear bearing G71 respectively; the main reduction main gear 704 is meshed with the main reduction slave gear 705; the differential 800 is fixedly connected to the main reduction slave gear 705.

[0034] Figure 1 In the illustrated embodiment, a torsional vibration damper 600 is connected between the engine 100 and the drive motor 200, and the second end of the input inner shaft X1 is spline-connected to the torsional vibration damper 600; the reducer 700 is fixed on the input outer shaft X2 between the torsional vibration damper 600 and the drive motor 200.

[0035] Figure 1In the embodiment shown, the planetary gear set 500 includes a sun gear, an inner ring gear, planetary gears and a planet carrier, and the inner ring gear is fixed; the generator 400 includes a generator stator 402, a generator rotor 401 and a generator shaft; the drive motor 200 includes a drive motor stator 202, a drive motor rotor 201 and a drive motor shaft, and the drive motor shaft is coaxially fixedly connected to the input outer shaft X2; the generator shaft is fixed on the generator rotor 401, and the first end of the generator shaft is fixedly connected to the sun gear of the planetary gear set 500 through the generator rear bearing G45, and the second end is fixedly connected to the active disc of the friction clutch 300 through the generator front bearing G43, and the passive disc of the friction clutch 300 is fixedly connected to the drive The motor shaft is fixedly connected, and the two ends of the drive motor shaft are supported by the drive motor rear bearing G21 and the drive motor front bearing G22 respectively; the first end of the input inner shaft X1 is fixedly connected to the planetary carrier of the planetary gear set 500, and the input inner shaft X1 passes through the hollow axis of the planetary carrier, sun gear, generator shaft, clutch, drive motor shaft, input outer shaft and other devices in the direction extending from the first end to the second end, and then is connected to the torsional vibration damper 600. After the input inner shaft X1 extends beyond the planetary gear set at its first end, it is radially and axially supported by the input inner rear bearing G11. The input inner shaft X1 is radially and axially supported by the input inner front bearing G12 at the position where its second end axially extends beyond the input outer shaft X2.

[0036] The gearbox of this embodiment is configured with a pure electric drive mode, an engine start mode, a power generation mode, a series drive mode, and an engine direct drive mode. Specifically:

[0037] 1. Pure Electric Drive Mode: Engine 100 is stopped, friction clutch 300 is open, and the drive motor is outputting power. The torque of the drive motor rotor 201 is transmitted via input external shaft X2 to primary reduction main gear 701. Primary reduction main gear 701 then transmits the torque to meshing primary reduction slave gear 702. The torque is then transmitted via output shaft 703 to final reduction main gear 704. This torque is then transmitted via final reduction slave gear 705 to differential 800, which then outputs the power to the left and right drive axles. In this mode, the energy source is the stored electrical energy in the vehicle's high-voltage battery.

[0038] 2. Engine Start Mode: The generator serves as the power source, and the friction clutch 300 is open. Torque is transmitted from the generator rotor 401 to the sun gear of the planetary gear set 500. The planetary carrier then outputs torque to the input internal shaft X1, which then drives the crankshaft through the torsional vibration damper 600 to reach the predetermined engine starting speed. In this operating mode, the energy source is the electrical energy stored in the vehicle's high-voltage battery.

[0039] 3. Generator Mode: Engine 100 is operating, and friction clutch 300 is open. Engine power is transmitted through torsional vibration damper 600 to input internal shaft X1, then to the planetary carrier of planetary gear set 500. The sun gear then transmits power to generator rotor 401, which then outputs electrical energy through generator stator 402. In this operating mode, the energy source is the chemical energy of the fuel in the tank.

[0040] 4. Series Drive Mode: The engine 100, generator, and drive motor are simultaneously operating, but the friction clutch 300 is open. This is the generator mode + drive motor mode. The engine's power is converted into electrical energy by the generator stator 402, then converted into mechanical power by the drive motor rotor 201. This power is then transferred through the input shaft X2, primary reduction main gear 701, primary reduction slave gear 702, output shaft 703, final reduction main gear 704, final reduction slave gear 705, and differential 800. Finally, the power is output to the left and right drive axles through the differential. In this operating mode, the energy source is the chemical energy of the fuel in the tank.

[0041] 5. Engine Direct Drive Mode: In this mode, the engine is operating. Its output power is transmitted through torsional vibration damper 600 to input inner shaft X1, then to the planetary carrier in planetary gearset 500. After being stepped up by the planetary gears, it is transmitted via the sun gear to generator rotor 401. This power is then transferred via friction clutch 300 to drive motor rotor 201, which is securely coupled to input outer shaft X2. Input outer shaft X2 then transmits power to primary reduction main gear 701, which then passes through primary reduction slave gear 702, output shaft 703, final reduction master gear 704, final reduction slave gear 705, differential 800, and ultimately to the left and right drive axles via the differential side gears. In this operating mode, the energy source is the chemical energy of the fuel in the tank.

[0042] 6. Parallel Drive Mode: In the aforementioned direct-drive engine mode, the drive motors can simultaneously output power, which is transmitted via the drive motor rotor 201 to the input external shaft X2. The power then passes through primary reduction gear 701, primary reduction gear 702, output shaft 703, final reduction gear 704, final reduction gear 705, differential 800, and ultimately to the left and right drive axles via the differential side gears. In this operating mode, the energy source is the chemical energy of the fuel in the tank and the electrical energy stored in the vehicle's high-voltage battery.

[0043] Example 2:

[0044] The basic principle of this embodiment is the same as that of embodiment 1, except that the clutch of this embodiment adopts a dog clutch 300'. Figure 2 shown.

[0045] In other embodiments, the clutch may also be a wet multi-plate clutch or the like.

[0046] Example 3:

[0047] This embodiment provides a hybrid vehicle having a hybrid vehicle-specific transmission according to embodiment 1 or embodiment 2.

[0048] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention. The dimensions described in the drawings and embodiments are not related to specific objects and are not used to limit the scope of protection of the present invention. The actual dimensions can be selected and changed according to actual needs.

Claims

1. A gearbox for hybrid electric vehicles, characterized in that: The invention comprises an engine (100), a drive motor (200), a generator (400), a planetary gear set (500), a clutch (300, 300'), a differential (800), a speed reducer (700), an input outer shaft (X2) and an input inner shaft (X1); the drive motor (200) and the generator (400) are coaxially arranged, the generator (400) is arranged between the planetary gear set (500) and the clutch (300, 300'), and the drive motor (200) is arranged between the clutch (300, 300') and the engine (100); The first end of the input outer shaft (X2) is fixedly connected to the drive motor (200), the second end of the input outer shaft (X2) extends toward the engine, and the drive motor (200) is fixedly connected to the input outer shaft (X2); The first end of the input inner shaft (X1) is fixedly connected to the planetary gear set (500), and the second end of the input inner shaft (X1) passes through the generator rotor, the clutch, and the drive motor rotor in sequence and is then connected to the engine; The drive motor (200) comprises a drive motor stator (202), a drive motor rotor (201) and a drive motor shaft, wherein the drive motor shaft is coaxially fixedly connected to the input outer shaft (X2), the drive motor shaft is fixedly connected to the passive disk of the clutch (300, 300'), and the input inner shaft axially passes through the axis of the drive motor shaft; A shock absorber (600) is connected between the engine and the drive motor, and the second end of the input inner shaft is connected to the shock absorber (600); The reducer (700) is connected to the input outer shaft (X2) between the drive motor and the engine, and the reducer (700) is fixed to the input outer shaft (X2) between the shock absorber and the drive motor; the reducer (700) includes a primary reducer and a main reducer, the primary reducer includes a primary reduction main gear (701) and a primary reduction slave gear (702), the main reducer includes a main reduction main gear (704) and a main reduction slave gear (705), the primary reduction main gear (701) is fixedly connected to the input outer shaft (X2), the primary reduction slave gear (702) is meshed with the primary reduction main gear (701); the primary reduction slave gear (702) is connected to the main reduction main gear (704) via an output shaft (703), and the main reduction main gear (704) is meshed with the main reduction slave gear (705); The planetary gear set (500) includes a sun gear, an inner ring gear, planetary gears, and a planet carrier, wherein the inner ring gear is fixed; a first end of the input inner shaft (X1) is fixedly connected to the planet carrier, and the input inner shaft (X1) extends from the first end to the second end, sequentially passes through the planet carrier, the sun gear, the generator shaft, the clutch, and the input outer shaft, and is then connected to the shock absorber (600); The generator (400) comprises a generator stator (402), a generator rotor (401) and a generator shaft; the generator shaft is fixed to the generator rotor (401), a first end of the generator shaft is fixedly connected to the sun gear, and a second end of the generator shaft is fixedly connected to the driving disc of the clutch (300, 300'); The differential (800) is fixedly connected to the main reduction gear (705) of the speed reducer (700).

2. A hybrid vehicle-specific gearbox according to claim 1, characterized in that: The clutch is a friction clutch (300).

3. The hybrid electric vehicle transmission according to claim 1, characterized in that: The clutch adopts a tooth clutch (300').

4. The hybrid electric vehicle transmission according to claim 1, characterized in that: The gearbox is configured with at least a pure electric drive mode, an engine start mode, a power generation mode, a series drive mode, an engine direct drive mode and a parallel drive mode.

5. A hybrid vehicle, characterized in that: A hybrid vehicle-specific gearbox according to any one of claims 1 to 4 is provided.

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