Planetary hybrid transmission for motor vehicles

Abstract

A planetary hybrid power transmission device for a motor vehicle comprises an engine, a drive motor, a planetary gear mechanism whose gear ring is fixedly arranged in the rotor of the drive motor and connected to a hollow transmission shaft, a transmission main shaft passes through the hollow transmission shaft to form a coaxial shaft, and forms a sliding fit with the hollow transmission shaft, the crankshaft of the engine is connected to the planetary carrier of the planetary gear mechanism through an input shaft, the planetary carrier is connected to the transmission main shaft through a clutch, the active friction component of the clutch is connected to the planetary carrier, the driven friction component is connected to the transmission main shaft, the planetary gear of the planetary gear mechanism is arranged between the gear ring and the sun gear, the sun gear shaft of the sun gear is loosely sleeved on the input shaft to form a coaxial shaft, the sun gear shaft is connected to a brake, the active friction component of the brake is fixed in the housing of the planetary hybrid power transmission device, the driven friction component is connected to the sun gear shaft, an output shaft is located on the same axis line as the input shaft and the transmission main shaft, and a transmission countershaft is arranged in parallel with the output shaft.

Description

Technical Field

[0001] The invention relates to the field of hybrid power vehicles, and in particular to a planetary hybrid power transmission device for a motor vehicle. Background Art

[0002] At present, most hybrid vehicles use oil-electric hybrid transmission devices, and most oil-electric hybrid transmission devices use a dual-motor structure, that is, the oil-electric hybrid transmission device includes an engine powered by fuel and a drive motor powered by electricity, and also adds a generator. The generator uses the power of the motor vehicle to generate electricity and provide electricity for the motor vehicle. After the engine stops, the drive motor is used to drive the motor vehicle to reduce motor vehicle exhaust emissions and protect the environment. However, the connection and control between the engine, generator and drive motor have a direct impact on the driving performance of hybrid vehicles.

[0003] The patent "Hybrid and electric motor drive transmission device for electric power system and its operation method" with publication number US 20210053434 A1 discloses a transmission device for a power system, which includes a first electric motor EM1, a second electric motor EM2, a single planetary gear system PG and a reduction gear transmission mechanism. The transmission device is equipped with a brake B1 and two clutches C1, C2, and can realize a two-speed motor drive mode, and meet the low-speed high-torque and high-speed use requirements of the motor drive. In the hybrid drive process, input power distribution and fixed speed ratio mode are adopted to achieve efficient operation of the power system. However, the technical solution in this patent adopts multiple clutches, brakes and planetary mechanisms to cooperate with each other to realize hybrid drive, and there are very few pure electric drive gears and fuel drive gears. The hybrid mode and the functions it can achieve are single, which is used for vehicles with rich functions and environmental requirements. It cannot more effectively optimize fuel economy and is not conducive to richer economic power distribution. Summary of the invention

[0004] The purpose of the present invention is to address the corresponding deficiencies in the prior art and to provide a planetary hybrid power transmission device for a motor vehicle, which utilizes a planetary gear mechanism to divert the power of the engine and the drive motor, thereby increasing the number of pure electric drive gears and fuel drive gears. It is used for vehicles with rich functional and environmental requirements, can more effectively optimize fuel economy, and is conducive to richer economical power distribution.

[0005] The objective of the present invention is achieved by adopting the following scheme: a planetary hybrid power transmission device for a motor vehicle, comprising an engine, a drive motor, a ring gear of a planetary gear mechanism fixedly arranged in a rotor of the drive motor and connected to a hollow transmission shaft, a transmission main shaft passing through the hollow transmission shaft to form a coaxial shaft, and forming a sliding fit with the hollow transmission shaft, the crankshaft of the engine is connected to the planet carrier of the planetary gear mechanism through an input shaft, the planet carrier is connected to the transmission main shaft through a clutch, the active friction component of the clutch is connected to the planet carrier, the driven friction component is connected to the transmission main shaft, the planetary gear of the planetary gear mechanism is arranged between the ring gear and the sun gear, the sun gear shaft of the sun gear is loosely sleeved on the input shaft to form a coaxial shaft, the sun gear shaft is connected to a brake, the active friction component of the brake is fixed in a housing of the planetary hybrid power transmission device, the driven friction component is connected to the sun gear shaft, an output shaft is located on the same axis line as the input shaft and the transmission main shaft, and a transmission countershaft is arranged in parallel with the output shaft;

[0006] A first gear is fixed circumferentially on the hollow transmission shaft, a third gear is provided in an empty sleeve on the transmission main shaft, and a first synchronizer is provided between the first gear and the third gear and is fixed circumferentially on the transmission main shaft;

[0007] The fifth gear is arranged on the idler sleeve of the output shaft, a third synchronizer is arranged between the third gear and the fifth gear and is circumferentially fixed on the output shaft, the left gear ring of the third synchronizer is circumferentially fixed on the transmission main shaft, and the seventh gear is circumferentially fixed on the output shaft;

[0008] The second gear and the fourth gear are circumferentially fixed on the transmission countershaft, the sixth gear and the eighth gear are set on the idle sleeve of the transmission countershaft, and a second synchronizer is set between the sixth gear and the eighth gear and is circumferentially fixed on the transmission countershaft;

[0009] The first gear meshes with the second gear, the third gear meshes with the fourth gear, the fifth gear meshes with the sixth gear, and the seventh gear meshes with the eighth gear.

[0010] A motor shaft of a generator is loosely connected to the sun gear shaft on the input shaft.

[0011] According to the above scheme, a ring gear of a planetary gear mechanism is fixedly arranged in the rotor of the driving motor and connected to a hollow transmission shaft. A transmission main shaft passes through the hollow transmission shaft to form a coaxial shaft and forms a sliding fit with the hollow transmission shaft. The crankshaft of the engine is connected to the planet carrier of the planetary gear mechanism through an input shaft. The planet carrier is connected to the transmission main shaft through a clutch. The active friction component of the clutch is connected to the planet carrier, and the driven friction component is connected to the transmission main shaft. The planetary gear of the planetary gear mechanism is arranged between the ring gear and the sun gear. The sun gear shaft of the sun gear is an idler sleeve. A concentric shaft is formed on the input shaft, the sun gear shaft is connected to a brake, the active friction component of the brake is fixed in the housing of the planetary hybrid power transmission device, the driven friction component is connected to the sun gear shaft, an output shaft and the input shaft and the transmission main shaft are all located on the same axis, a transmission secondary shaft is arranged parallel to the output shaft, and a planetary gear mechanism is used to divert the power of the engine and the drive motor, thereby increasing the number of pure electric drive gears and fuel drive gears. It is used for vehicles with rich functional and environmental requirements, can more effectively optimize fuel economy, and is conducive to richer economical power distribution.

[0012] The motor shaft of a generator is connected to the sun gear shaft through an idle sleeve on the input shaft, and is used to generate electricity using the power transmitted from the sun gear shaft.

[0013] The advantages of the present invention are as follows:

[0014] 1. In the technical solution of the present invention, both motors can realize the idle power generation function, and have richer hybrid power function selection modes.

[0015] 2. In the technical solution of the present invention, the driving motor can compensate for the power interruption caused by gear switching during fuel-powered driving, thereby achieving better comfort and power.

[0016] 3. The present invention has a simple structure, clear functions of the participating functional components, and low cost, which is conducive to the integration and matching of hybrid power system vehicles;

[0017] 4. The technical solution of the present invention has good scalability, can achieve more reasonable modularization and platform development, and can adapt to the requirements of more vehicle models;

[0018] 5. The technical solution of the present invention can realize the power transmission system requirements of the engine and the motor with multiple gears, and a drive motor with a smaller torque requirement can be selected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0021] like Figure 1 to Figure 2 As shown, a planetary hybrid power transmission device for a motor vehicle includes an engine 1, a drive motor 2, a ring gear X3 of a planetary gear mechanism fixedly arranged in the rotor of the drive motor 2, connected to a hollow transmission shaft Z5, a transmission main shaft Z2 passes through the hollow transmission shaft Z5 to form a coaxial shaft, and forms a sliding fit with the hollow transmission shaft Z5, the crankshaft of the engine 1 is connected to the planet carrier X4 of the planetary gear mechanism through an input shaft Z1, the planet carrier X4 is connected to the transmission main shaft Z2 through a clutch C1, and the active friction component of the clutch C1 is connected to the planet carrier X4 The driven friction assembly is connected to the transmission main shaft Z2, the planetary gear X2 of the planetary gear mechanism is arranged between the ring gear X3 and the sun gear X1, the sun gear shaft X6 of the sun gear X1 is loosely sleeved on the input shaft Z1 to form a concentric shaft, the sun gear shaft X6 is connected to a brake B1, the active friction assembly of the brake B1 is fixed in the housing of the planetary hybrid power transmission device, the driven friction assembly is connected to the sun gear shaft X6, an output shaft Z4 is located on the same axis as the input shaft Z1 and the transmission main shaft Z2, and a transmission countershaft Z3 is arranged in parallel with the output shaft Z4;

[0022] A first gear G1 is fixed circumferentially on the hollow transmission shaft Z5, a third gear G3 is set in an empty sleeve on the transmission main shaft Z2, and a first synchronizer T1 is set between the first gear G1 and the third gear G3 and fixed circumferentially on the transmission main shaft Z2;

[0023] A fifth gear G5 is provided on the output shaft Z4, a third synchronizer T3 is provided between the third gear G3 and the fifth gear G5 and is circumferentially fixed on the output shaft Z4, a left gear ring of the third synchronizer T3 is circumferentially fixed on the transmission main shaft Z2, and a seventh gear G7 is circumferentially fixed on the output shaft Z4;

[0024] The second gear G2 and the fourth gear G4 are circumferentially fixed on the transmission countershaft Z3, the sixth gear G6 and the eighth gear G8 are set in an empty sleeve on the transmission countershaft Z3, and a second synchronizer T2 is set between the sixth gear G6 and the eighth gear G8 and is circumferentially fixed on the transmission countershaft Z3;

[0025] The first gear G1 meshes with the second gear G2 , the third gear G3 meshes with the fourth gear G4 , the fifth gear G5 meshes with the sixth gear G6 , and the seventh gear G7 meshes with the eighth gear G8 .

[0026] In this embodiment, a motor shaft of a generator 3 is connected to the sun gear shaft X6 in an idle sleeve on the input shaft Z1 for generating electricity using the power of the engine 1 .

[0027] The input shaft Z1, the transmission main shaft Z2, the transmission secondary shaft Z3, the output shaft Z4 and the hollow transmission shaft Z5 are all supported in the housing of the planetary hybrid power transmission device through bearings.

[0028] The operation mode of the hybrid vehicle adopting the above scheme is as follows:

[0029] Engine-only mode:

[0030] The power of the engine 1 cooperates with each other through the clutch C1, the brake B1, the first synchronizer T1, the second synchronizer T2, and the third synchronizer T3 to achieve 9 driving gears including a direct drive gear, thereby realizing the AMT automatic transmission function.

[0031] Pure electric mode:

[0032] The power of the driving motor 2 cooperates with each other through the first synchronizer T1, the second synchronizer T2, and the third synchronizer T3 to achieve 4 pure electric driving gears. The gear can be selected according to the motor status and other requirements during the driving process.

[0033] Hybrid drive mode:

[0034] The power of the engine 1 and the drive motor 2 cooperate with each other through the clutch C1, the brake B1, the first synchronizer T1, the second synchronizer T2, and the third synchronizer T3 to achieve 9 fuel drive gears including a direct drive gear and 4 pure electric drive gears. During the driving process, the power of the drive motor 2 can assist the power of the engine 1 to achieve gear shifting without power interruption. While the power is more sufficient, it has better comfort and smoothness.

[0035] Idle mode:

[0036] Through the cooperation of the clutch C1, the brake B1 and the first synchronizer T1, two idle gears can be selected. If the generator 3 is not provided, the power of the engine 1 can enable the drive motor 2 to generate electricity through the two idle gears.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A planetary hybrid power transmission device for a motor vehicle, comprising an engine (1) and a drive motor (2), characterized in that: A ring gear (X3) of a planetary gear mechanism is fixedly arranged in the rotor of a driving motor (2) and connected to a hollow transmission shaft (Z5); a transmission main shaft (Z2) passes through the hollow transmission shaft (Z5) to form a coaxial shaft and forms a sliding fit with the hollow transmission shaft (Z5); the crankshaft of the engine (1) is connected to the planet carrier (X4) of the planetary gear mechanism through an input shaft (Z1); the planet carrier (X4) is connected to the transmission main shaft (Z2) through a clutch (C1); the active friction component of the clutch (C1) is connected to the planet carrier (X4); the driven friction component is connected to the transmission main shaft (Z2); The planetary gear (X2) of the planetary gear mechanism is arranged between the ring gear (X3) and the sun gear (X1); the sun gear shaft (X6) of the sun gear (X1) is loosely sleeved on the input shaft (Z1) to form a coaxial shaft; the sun gear shaft (X6) is connected to a brake (B1); the active friction component of the brake (B1) is fixed in a housing of the planetary hybrid power transmission device; the driven friction component is connected to the sun gear shaft (X6); an output shaft (Z4) and the input shaft (Z1) and the transmission main shaft (Z2) are all located on the same axis; and a transmission secondary shaft (Z3) is arranged in parallel with the output shaft (Z4); A first gear (G1) is fixed circumferentially on the hollow transmission shaft (Z5), a third gear (G3) is provided in an empty sleeve on the transmission main shaft (Z2), and a first synchronizer (T1) is provided between the first gear (G1) and the third gear (G3) and is fixed circumferentially on the transmission main shaft (Z2); A fifth gear (G5) is provided in an empty sleeve on the output shaft (Z4); a third synchronizer (T3) is provided between the third gear (G3) and the fifth gear (G5) and is circumferentially fixed on the output shaft (Z4); a left gear ring of the third synchronizer (T3) is circumferentially fixed on the transmission main shaft (Z2); and a seventh gear (G7) is circumferentially fixed on the output shaft (Z4); A second gear (G2) and a fourth gear (G4) are circumferentially fixed on the transmission countershaft (Z3); a sixth gear (G6) and an eighth gear (G8) are provided in an empty sleeve on the transmission countershaft (Z3); and a second synchronizer (T2) is provided between the sixth gear (G6) and the eighth gear (G8) and is circumferentially fixed on the transmission countershaft (Z3); The first gear (G1) meshes with the second gear (G2), the third gear (G3) meshes with the fourth gear (G4), the fifth gear (G5) meshes with the sixth gear (G6), and the seventh gear (G7) meshes with the eighth gear (G8).

2. The planetary hybrid power transmission device according to claim 1, characterized in that: The motor shaft of a generator (3) is connected to the sun gear shaft (X6) through an idle sleeve on an input shaft (Z1).

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