A hybrid vehicle drive system

Abstract

The present invention discloses a hybrid vehicle driving system, comprising an internal combustion engine, a transmission gear pair, a generator, an electric motor, an on-board battery, a separation clutch, a multi-speed gear pair, a first multi-stage gearbox and a second multi-stage gearbox, wherein the transmission gear pair comprises a first transmission main gear and a first transmission driven gear meshing with each other, and a transmission ratio of the first transmission gear pair is less than 1; the first transmission shaft A of the internal combustion engine is fixedly connected to the first transmission driving gear; the rotating shaft of the generator is fixedly connected to the first transmission driven gear; the generator is electrically connected to the on-board battery; the on-board battery is electrically connected to the electric motor; the electric motor is transmission-connected to the second multi-stage gearbox; the end of the first transmission shaft A of the internal combustion engine is transmission-connected to the separation clutch, and the present invention has a compact structure and solves the problem of insufficient power and economy of hybrid vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a hybrid vehicle driving system with high-efficiency speed change. Background Art

[0002] At the beginning of the 21st century, the voices of countries around the world for improving environmental protection are growing louder and louder, and various electric vehicles have emerged. Although people generally believe that the future belongs to electric vehicles, the current battery technology problems hinder the application of electric vehicles. The energy density of batteries is hundreds of times lower than that of gasoline, and has not yet reached the value required by people. At present, hybrid vehicles have emerged and are favored by the market. The so-called hybrid vehicle is a combination of an electric motor and an auxiliary power unit in a car as a driving force. The auxiliary power unit is actually a small fuel engine or power generator set. There is still a long way to go for hybrid vehicles to enter practical use. The hybrid power unit based on the existing thermal engine should convert fuel or electrical energy into useful work. At the same time, how to improve the power conversion efficiency to improve the balance between vehicle power and economy is a crucial issue. Therefore, it is necessary to design an efficient variable speed hybrid vehicle drive system to improve the shortcomings of hybrid vehicles in terms of power and economy. Summary of the invention

[0003] The purpose of the present invention is to provide a hybrid vehicle driving system with high-efficiency speed change to solve the problem of insufficient power and economy of hybrid vehicles.

[0004] To achieve the above object, the present invention provides the following technical solution: a hybrid vehicle drive system with high-efficiency transmission, comprising an internal combustion engine, a transmission gear pair, a generator, an electric motor, an on-board battery, a separation clutch, a multi-speed transmission gear pair, a first multi-stage gearbox and a second multi-stage gearbox, wherein:

[0005] The transmission gear pair comprises a first transmission main gear and a first transmission driven gear meshing with each other, and the transmission ratio of the first transmission gear pair is less than 1;

[0006] The first transmission shaft A of the internal combustion engine is fixedly connected to the first transmission driving gear;

[0007] The rotating shaft of the generator is fixedly connected to the first transmission driven gear;

[0008] The generator is electrically connected to the vehicle-mounted battery;

[0009] The vehicle-mounted battery is electrically connected to the electric motor;

[0010] The electric motor is transmission-connected to the second multi-stage gearbox;

[0011] The end of the first transmission shaft A of the internal combustion engine is drivably connected to the separation clutch;

[0012] The separation clutch is drivably connected to the multi-speed gear pair;

[0013] The second transmission shaft B of the multi-speed gear pair is drivably connected to the first multi-stage gearbox.

[0014] The first multi-stage gearbox and the second multi-stage gearbox have the same structure and are longitudinally symmetrically arranged on both sides of the differential.

[0015] Furthermore, the multi-speed gear pair includes a first gear speed driving gear, a second gear speed driving gear, a third gear speed driving gear, a fourth gear speed driving gear, a fifth gear speed driving gear and a gear connecting member. The first gear speed driving gear, the second gear speed driving gear and the fifth gear speed driving gear are fixedly connected to the first transmission shaft A, and the third gear speed driving gear and the fourth gear speed driving gear transmit power through the third and fourth gear transmission connecting members fixedly connected to the first transmission shaft A. The third gear speed driven gear and the fourth gear speed driven gear are fixedly connected to the second transmission shaft B. The first gear speed driven gear, the second gear speed driven gear and the fifth gear speed driven gear transmit power on the first transmission shaft to the second transmission shaft through the first and second gear transmission connecting members and the fifth gear connecting member fixedly connected to the second transmission shaft B respectively.

[0016] Furthermore, the multi-stage transmission as a whole includes a power input shaft, a power output shaft, a first gear ring, a second gear ring, a sun gear, a planetary gear set 1, a planetary gear set 2 and a planetary gear set 3. The first gear ring corresponds to the planetary gear set 1, the planetary gear set 2 and the sun gear, and is arranged in sequence at the radial position of the first gear ring. The power input shaft is fixedly connected to the sun gear. The input shaft corresponding to the second gear ring is connected to the output shaft 1 and the output shaft 2 of the planetary gear set 1 and the planetary gear set 2 in the first gear ring. The planetary gear set 1 and the planetary gear set 2 in the first gear ring directly transmit power to the center gear 1 corresponding to the second gear ring. The first gear ring can complete 2-stage speed change. A center gear 2 and a planetary gear set 3 are installed in the second gear ring to complete the 3rd stage speed change. The power output shaft can be connected to the center gear 2 to transmit power to the differential.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The high-efficiency hybrid vehicle drive system proposed by the present invention is provided with a multi-stage gearbox before the differential, and the multi-stage speed change can realize a three-stage speed change, and the power torque increase through the transmission mechanism can be transmitted to the drive axle unit of the drive terminal, so that the power performance of the hybrid vehicle is more superior, and the starting and climbing torque is large. The three-stage speed change gear is designed as two sets of planetary gears, which has a more compact structure and higher transmission efficiency.

[0019] (2) The high-efficiency hybrid vehicle drive system proposed in the present invention has a multi-speed transmission, and the speed gear can be switched according to road requirements through the gear connector, which has good fuel economy, matches the electric drive, comprehensively reduces energy loss, and improves energy utilization efficiency.

[0020] (3) The multi-speed gear pair proposed in the present invention has a simple structure, reasonable configuration, compact structure, high transmission efficiency, convenient gear switching mode, and more flexible operability.

[0021] (4) The planetary gears in the multi-stage transmission proposed in the present invention can complete three-stage speed change, separate the internal combustion engine driving force and the electric driving force, and make power switching in the hybrid mode more convenient and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the drive system of the present invention;

[0023] Figure 2 It is a schematic diagram of a multi-speed gear.

[0024] In the figure: 1-internal combustion engine, 2-first transmission driving gear, 3-separation clutch, 4-first gear speed change driving gear, 5-second gear speed change driving gear, 6-third gear speed change driving gear, 7-third and fourth gear transmission connecting member, 8-fourth gear speed change driving gear, 9-fifth gear speed change driving gear, 10-fifth gear connecting member, 11-fifth gear speed change driven gear, 12-fourth gear speed change driven gear, 13-third gear speed change driven gear, 14-second gear speed change driven gear, 15-first and second gear transmission connecting member, 16-first gear speed change driven gear, 17-first multi-stage gearbox, 18-first transmission driven gear, 19-second multi-stage gearbox, 20-differential, 21-drive axle unit, 22-motor, 23-generator, 24-on-board battery, 25-sun gear, 26-planetary gear set one, 27-planetary gear set two, 28-output shaft one, 29-output shaft two, 30-planetary gear set three, 31-power output shaft, 32-center gear, 33-first gear ring, 34-second gear ring, 35-power input shaft, A-first rotating shaft, B-second rotating shaft. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Referring to the attached drawings, a hybrid vehicle driving system with high efficiency transmission proposed by the present invention mainly comprises: an internal combustion engine 1, a generator 23, an electric motor 22, an on-board battery 24, a transmission gear pair, a separation clutch 3, a multi-speed transmission gear pair, a first multi-stage gearbox 17, and a second multi-stage gearbox 19. The transmission gear pair comprises a first transmission driving gear 2 and a first transmission driven gear 18 meshing with each other.

[0027] The internal combustion engine 1 is fixedly connected to the first transmission driving gear 2 through the first transmission shaft A. When the internal combustion engine 1 is working, the mechanical energy of the internal combustion engine is transmitted to the generator 23 through the first transmission driving gear 2 and the first transmission driven gear 18. The generator 23 is connected to the vehicle-mounted battery 24, and the mechanical energy in the internal combustion engine 1 is effectively converted into electrical energy in the battery 24. The transmission ratio of the transmission gear pair is less than 1, which has a speed-increasing effect.

[0028] The power source of the input end of the electric motor 22 is the electricity of the vehicle battery. The electric energy of the battery 24 mainly comes from external charging and the conversion of mechanical energy of the internal combustion engine. The hybrid system proposed in the present invention can be driven together or separately on different road surfaces. When the car accelerates to climb a slope, the electric motor and the generator can provide power to the transmission mechanism at the same time.

[0029] The output shaft of the internal combustion engine 1 is connected to the separation clutch 3. When the separation clutch 3 is closed, the power of the internal combustion engine 1 is transmitted to the multi-speed gear pair.

[0030] The multi-speed gear pair includes a second transmission shaft B. The first speed shift driving gear 4, the second speed shift driving gear 5, and the fifth speed shift driving gear 9 are fixedly connected to the first transmission shaft A, and the third speed shift driving gear 6 and the fourth speed shift driving gear 8 transmit power through the third and fourth speed transmission connecting member 7 fixedly connected to the first transmission shaft A. The third speed shift driven gear 13 and the fourth speed shift driven gear 12 are fixedly connected to the second transmission shaft B, and the first speed shift driven gear 16, the second speed shift driven gear 14, and the fifth speed shift driven gear 11 transmit the power on the first transmission shaft to the second transmission shaft through the first and second speed transmission connecting members 15 and the fifth speed connecting member 10 fixedly connected to the second transmission shaft B, respectively.

[0031] The gear pairs in the multi-stage gearboxes 17 and 19 are connected to the differential 20 in the drive axle unit 21, and are longitudinally symmetrically arranged on both sides of the differential 20. The power from the internal combustion engine 1 is transmitted to the first multi-stage gearbox 19 through the second transmission shaft B, and the power from the motor is transmitted to the second multi-stage gearbox 17 through the motor output shaft. The multi-stage gearbox as a whole is mainly composed of a multi-stage planetary gear pair, which includes a 3-speed gear setting, including a first gear ring 34, a second gear ring 33, and a planetary gear set 1 26, a planetary gear set 27 and a planetary gear set 3 30, each planetary set has no less than 3 gears, and the sun gear 25 corresponding to the first gear ring is fixed to the planetary gear input shaft 35. The first gear ring corresponds to connecting the planetary gear set 1 26 and the planetary gear set 27, and is arranged in sequence at the radial position of the first gear ring 34. The input shaft corresponding to the second gear ring 33 is connected to the output shaft 1 28 of the planetary gear set 1 26 and the output shaft 2 29 of the planetary gear set 27 in the first gear ring. The planetary gear set 1 26 and the planetary gear set 27 in the first gear ring directly transmit the power to the central gear 32 corresponding to the second gear ring. The first gear ring 34 can complete the second gear shift. The second gear ring 33 includes a central wheel 32 and a planetary gear set 30, which can complete the third gear shift and transmit the power to the differential 20 through the output shaft 31.

[0032] The internal combustion engine power and the electric motor power are respectively transmitted to the differential 20 through the first multi-stage gearbox 17 and the second multi-stage gearbox 19 , and then transmitted to the drive axle unit 21 .

[0033] The high-efficiency hybrid vehicle drive system proposed by the present invention is provided with a multi-stage gearbox in front of the differential, and the multi-stage speed change can realize 3-stage speed change, and the power torque increase through the transmission mechanism can be transmitted to the drive axle unit of the drive terminal, so that the power performance of the hybrid vehicle is more superior, and the starting and climbing torque is large. The 3-stage speed change gear is designed as two sets of planetary gears, with a more compact structure and higher transmission efficiency.

[0034] The high-efficiency hybrid vehicle drive system proposed in the present invention has multi-speed transmission, and the speed transmission gear can be switched according to road requirements through the gear connector, has good fuel economy, matches the electric drive, comprehensively reduces energy loss, and improves energy utilization efficiency.

[0035] The multi-speed gear pair proposed in the present invention has a simple structure, reasonable configuration, compact structure, high transmission efficiency, convenient gear switching mode, and more flexible operability.

[0036] The planetary gears in the multi-stage transmission proposed in the present invention can complete three-stage speed change, separate the internal combustion engine driving force and the electric driving force for speed change, and the power switching in the hybrid mode is more convenient and more efficient.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hybrid vehicle driving system, characterized in that: It includes an internal combustion engine, a transmission gear pair, a generator, an electric motor, an on-board battery, a separation clutch, a multi-speed gear pair, a first multi-stage gearbox and a second multi-stage gearbox, wherein: The transmission gear pair comprises a first transmission main gear and a first transmission driven gear meshing with each other, and the transmission ratio of the transmission gear pair is less than 1; The first transmission shaft A of the internal combustion engine is fixedly connected to the first transmission driving gear; The rotating shaft of the generator is fixedly connected to the first transmission driven gear; The generator is electrically connected to the vehicle-mounted battery; The vehicle-mounted battery is electrically connected to the electric motor; The electric motor is transmission-connected to the second multi-stage gearbox; The end of the first transmission shaft A of the internal combustion engine is drivably connected to the separation clutch; The separation clutch is drivably connected to the multi-speed gear pair; The second transmission shaft B of the multi-speed gear pair is drivably connected to the first multi-stage gearbox; The first multi-stage gearbox and the second multi-stage gearbox have the same structure and are longitudinally symmetrically arranged on both sides of the differential; The first multi-stage transmission and the second multi-stage transmission include a power input shaft, a power output shaft, a first gear ring, a second gear ring, a sun gear, a planetary gear set 1, a planetary gear set 2 and a planetary gear set 3. The first gear ring is correspondingly connected to the planetary gear set 1, the planetary gear set 2 and the sun gear, and are arranged in sequence at the radial position of the first gear ring. The power input shaft is fixedly connected to the sun gear. The input shaft corresponding to the second gear ring is connected to the output shaft 1 and the output shaft 2 of the planetary gear set 1 and the planetary gear set 2 in the first gear ring. The planetary gear set 1 and the planetary gear set 2 in the first gear ring directly transmit power to the center gear 1 corresponding to the second gear ring. The first gear ring can complete 2-stage speed change. A center gear 2 and a planetary gear set 3 are installed in the second gear ring to complete the 3rd stage speed change. The power output shaft can be connected to the center gear 2 to transmit power to the differential.

2. The hybrid vehicle driving system according to claim 1, characterized in that: The multi-speed gear pair includes a first speed shift driving gear, a second speed shift driving gear, a third speed shift driving gear, a fourth speed shift driving gear, a fifth speed shift driving gear and a gear connecting member. The first speed shift driving gear, the second speed shift driving gear and the fifth speed shift driving gear are fixedly connected to the first transmission shaft A. The third speed shift driving gear and the fourth speed shift driving gear transmit power through the third and fourth speed transmission connecting members fixedly connected to the first transmission shaft A. The third speed shift driven gear and the fourth speed shift driven gear are fixedly connected to the second transmission shaft B. The first speed shift driven gear, the second speed shift driven gear and the fifth speed shift driven gear transmit power on the first transmission shaft to the second transmission shaft through the first and second speed transmission connecting members and the fifth speed connecting member fixedly connected to the second transmission shaft B respectively.

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