CN214450249U

CN214450249U - Dual-mode power splitting and converging stepless speed change transmission system

Info

Publication number: CN214450249U
Application number: CN202120321551.3U
Authority: CN
Inventors: 杨振忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-10-22
Anticipated expiration: 2031-02-04

Abstract

The utility model discloses a double mode power divides infinitely variable transmission system who converges, include: an output shaft of the engine is fixedly connected with a rotor of the generator, concentrically penetrates through an output hollow shaft of the motor and is fixedly connected with a planetary gear ring shaft; the rotor of the motor is fixedly connected with the input disc of the clutch C1 and the sun gear shaft of the planet row through the output hollow shaft of the motor; the planet carrier hollow shaft is fixedly connected with the planet carrier; the power output shaft concentrically penetrates through the hollow shaft of the planet carrier and then is fixedly connected with the planet row gear ring shaft; the output disc of the clutch C1 is fixedly connected with a gear of a motor output Z1; the planet carrier output Z3 gear is fixedly connected with the planet carrier hollow shaft; the electromechanical power confluence shaft is fixedly connected with a Z2 gear output of the motor and an output disc of the clutch C2; and the planet carrier output Z4 driven gear is fixedly coupled to the input disc of clutch C2. The engine power splitting and converging device can realize high-efficiency continuous operation of full power, and reduce the size, cost and structural design difficulty of double motors.

Description

Dual-mode power splitting and converging stepless speed change transmission system

Technical Field

The utility model relates to a high horse power tractor and non-road vehicle are with novel CVT (continuously variable transmission) transmission system field, especially about a double mode power divides infinitely variable transmission system who converges.

Background

The existing tractor transmission system is divided into a manual gear shifting transmission system, a power uninterrupted automatic gear shifting transmission system and a hydraulic mechanical stepless speed change transmission system (HMCVT) according to a gear shifting mode.

1. Manual gear shifting transmission system

When the tractor works in the field, the change of land resistance is large, the load change of the whole tractor is large, the tractor adopting a manual gear shifting transmission system needs frequent stopping and gear shifting so as to meet the requirements of traction force and speed of farm tool operation, the working intensity of workers is large, the working efficiency is low, and the working quality is unstable; meanwhile, the rotating speed of the engine is directly related to the speed of the vehicle, the change range of the rotating speed of the engine is large due to the change of the speed of the whole vehicle, and the engine cannot work in a stable and economical rotating speed range, so that the oil consumption is high, the emission is poor, and the vibration and abrasion are large. The manual transmission system has simple structure and low manufacturing and maintenance cost, and is suitable for the current purchase level of farmers. In advanced countries of the world, manual gear shifting transmission systems are mostly applied to tractor products with horsepower below 80 Hp.

2. Continuous automatic gear shifting transmission system for power of tractor

A wet-type multi-plate clutch is used as a gear shifting executing mechanism, and gear shifting without stopping is achieved in the process of vehicle load running. The labor intensity of the staff is reduced, and the operation comfort and the operation efficiency are improved. However, the engine speed of the uninterrupted automatic gear shifting transmission system is directly related to the vehicle speed, the change range of the engine speed is large due to the change of the vehicle load, the engine still works in a range with large change of the engine speed, and the oil consumption and the emission of the engine are poor. Meanwhile, the tractor has a large number of gears, the transmission structure needs a large number of clutches and proportional valves, and a 160-horsepower 16-gear gearbox is taken as an example: the full-domain automatic gearbox needs 8 clutches and 8 hydraulic proportional valves; the shifting clutch control requirements for each gear are very complex; at present, the technology of the system is basically mastered by foreign companies and mainly depends on import, and the transmission system has the advantages of complex structure, high price, difficult price reduction and high maintenance cost. For cost reasons, in advanced countries of the world, powershift transmissions are often used in 120-Hp 300Hp tractor products.

3. Hydraulic mechanical stepless speed change transmission system (HMCVT)

The transmission system consists of a hydraulic variable pump/motor/planetary mechanism/wet clutch and a brake, and has the main advantages that: by the power splitting and converging principle, the torque and the rotating speed of the transmission system can be automatically and continuously changed according to the requirements of the speed and the traction of the vehicle, and the traction and the speed requirements of the vehicle during running are ensured.

The transmission system realizes the CVT function of the vehicle transmission system, and has the advantages of low operation intensity of workers, good operation comfort, high operation efficiency and high quality; because the rotating speed and the torque of the engine are completely decoupled with the speed and the traction force of the whole vehicle, the engine can stably work in a low oil consumption area.

The high-pressure variable plunger pump/motor, the proportional valve and the like adopted by the transmission system belong to precise hydraulic coupling parts, have very high requirements on clean and clean assembly, use cleanliness and maintenance cleanliness, need special hydraulic oil and have high use and maintenance cost; the transmission case of the system adopts a multi-row planetary mechanism and a wet clutch or a brake to realize the regional CVT with 2-6 gears, the structure is complex, the key technology of a high-power hydraulic element is mastered by foreign companies, key components depend on import, the cost is high, and the price reduction is difficult. Due to the price and the use and maintenance, the system is used in a very small amount in the Chinese market. For cost reasons, the Hydraulic Mechanical Continuously Variable Transmission (HMCVT) is mostly applied to 200-400 Hp tractor products in advanced countries of the world.

The prior art variable speed shifting system suffers from the following drawbacks:

1. the manual gear shifting transmission system is adopted, so that the structure is simple, the manufacture, the maintenance and the repair are easy, and the cost is low. The disadvantages are as follows:

(1) the tractor adopting the manual gear shifting transmission system needs frequent stopping and gear shifting to meet the requirements of traction force and speed of farm tool operation, and has the advantages of high working strength of workers, low working efficiency and unstable working quality.

(2) The rotating speed of the engine is directly related to the speed of the vehicle, the change range of the rotating speed of the engine is large due to the change of the speed of the whole vehicle, the engine cannot work in a stable and economical rotating speed range, and the engine has high oil consumption, poor emission and large vibration abrasion.

2. The uninterrupted automatic power shifting transmission system realizes non-stop gear shifting during vehicle load running, and improves the operation efficiency and the control comfort of the tractor. The disadvantages are as follows:

(1) the rotating speed of the engine of the transmission system is directly related to the speed of the vehicle, the rotating speed variation range of the engine is large, the engine cannot work in a stable and economical rotating speed range, and the oil consumption and the emission are poor.

(2) The transmission system needs a large number of clutches and proportional valves, the abrasion of the clutches is increased along with the increase of the service time, the cleanliness and the temperature of oil are changed, the gear shifting control rule is easy to change, the gear shifting control process needs a large number of corrected parameters, the control is complex, the smoothness is poor, and gear shifting impact is generated.

(3) The traditional power gear shifting gearbox is in single-power line stepped transmission, realizes the ultra-low speed (200 plus 400m/h) required by a tractor, and needs complex reduction gear trains. Moreover, the stepless transmission during main operations such as rotary tillage and the like cannot be realized, and the optimal traction speed cannot be matched with a rotary cultivator in field operation.

(4) At present, the key technology of the system is mainly mastered by European and American companies, and the imported transmission system of the type has high price, difficult price reduction and high maintenance cost.

3. Hydro-mechanical continuously variable transmission (HMCVT): the full-domain stepless speed change system consisting of 2-4 gears is realized, the operation efficiency is high, the control comfort is good, the output of the engine is decoupled with the load and the speed of the vehicle, and the engine stably runs in a low-oil-consumption and low-emission region. The disadvantages are as follows:

(1) the mechanical speed change system consisting of 2-4 gears is a speed change mechanism consisting of a plurality of rows of planetary mechanisms and 4-6 wet clutches or brakes, and has the advantages of complex structure, high part processing requirement and high cost.

(2) The hydraulic power shunting system composed of the hydraulic precision matching parts has very high requirements on clean and clean assembly, use cleanliness and maintenance cleanliness, needs special hydraulic oil and has high use and maintenance cost.

(3) The technology of the systems is basically mastered by foreign companies, products mainly depend on import, and the systems are high in cost and difficult to reduce price.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a stepless speed change transmission system that double mode power divides and converges, it can avoid the above-mentioned defect that prior art exists very well and rationally.

To achieve the above object, the present invention provides a dual-mode power splitting and converging continuously variable transmission system, including: an output shaft of the engine is fixedly connected with a rotor of the generator, concentrically penetrates through an output hollow shaft of the motor and is fixedly connected with a planetary gear ring shaft; the rotor of the motor is fixedly connected with the input disc of the clutch C1 and the sun gear shaft of the planet row through the output hollow shaft of the motor; the planet carrier hollow shaft is fixedly connected with the planet carrier; the power output shaft concentrically penetrates through the hollow shaft of the planet carrier and then is fixedly connected with the planet row gear ring shaft; the output disc of the clutch C1 is fixedly connected with a gear of a motor output Z1; the planet carrier output Z3 gear is fixedly connected with the planet carrier hollow shaft; the electromechanical power confluence shaft is fixedly connected with a Z2 gear output of the motor and an output disc of the clutch C2; the planet carrier output Z4 driven gear is fixedly connected with the input disc of the clutch C2; the engine output shaft, the motor output hollow shaft, the planet row sun gear shaft, the planet row gear ring shaft and the planet carrier form a branch and confluence device of the engine power.

In a preferred embodiment, the engine power split mode comprises: the engine power is distributed to a generator rotor through an engine output shaft to form a mechanical power conversion electric power mode; distributing the electric power of the generator rotor to the motor rotor through a control device to form an electric power conversion mechanical power mode; the engine power is distributed to the planet row ring gear shaft through the engine output shaft to form a mechanical power split mode; and electric power of a rotor of the motor is distributed to a sun gear shaft of the planet row through a hollow output shaft of the motor to form a motor power splitting mode.

In a preferred embodiment, the power split in the mechanical power split mode and the power split in the motor power split mode are converged into an electromechanical power collecting shaft through a planet carrier, a hollow planet carrier shaft, a planet carrier output Z3 gear, a planet carrier output Z4 driven gear, a clutch C2 input disc and a clutch C2 output disc to form a double-motor power and engine partial power collecting power output mode.

In a preferred embodiment, when the input disc of the clutch C1 is combined with the output disc of the clutch C1, the input disc of the clutch C2 is separated from the output disc of the clutch C2, and the carrier output Z4 is idle, all the power of the engine is transmitted to the rotor of the generator through the output shaft of the engine to generate power, all the power of the rotor of the generator is supplied to the rotor of the motor through the control device, and all the power of the rotor of the motor is transmitted to the electromechanical power bus shaft through the hollow output shaft of the motor, the input disc of the clutch C1, the output disc of the clutch C1, the output gear of the motor Z1 and the output gear of the motor Z2 to form a full-electric power output mode with two motors connected in series.

In a preferred embodiment, the output modes of the branch and confluence devices further comprise a reverse mode and a power generation mode. The control device controls the motor rotor to rotate reversely, when the input disc of the clutch C1 is combined with the output disc of the clutch C1, and the input disc of the clutch C2 is separated from the output disc of the clutch C2, the power of the motor rotor is output to the electromechanical power collecting shaft through the motor output hollow shaft, the clutch C1 input disc, the clutch C1 output disc, the motor output Z1 gear and the motor output Z2 gear to form a reverse mode of full electric power output. The power generation mode is that when the input disc of the clutch C1 is separated from the output disc of the clutch C1 and the input disc of the clutch C2 is separated from the output disc of the clutch C2, the rotor of the generator can output constant power, and the electric power is rectified by the control device and then is output outwards.

In a preferred embodiment, the output modes of the branch and confluence devices further include an ultra-low speed creep mode in which the control device controls the motor rotor to be in a constant torque low speed section, and the ultra-low speed creep mode includes: when the input disc of the clutch C1 is combined with the output disc of the clutch C1, and the input disc of the clutch C2 is separated from the output disc of the clutch C2, the power of the rotor of the motor is output to the electromechanical power collecting shaft through the hollow output shaft of the motor, the input disc of the clutch C1, the output disc of the clutch C1, the Z1 gear of the motor and the Z2 gear of the motor to form an ultra-low speed crawling mode with full electric power output; and when the input disc of the clutch C1 is separated from the output disc of the clutch C1, and the input disc of the clutch C2 is combined with the output disc of the clutch C2, the power of the rotor of the motor is transmitted to the sun gear shaft of the planet row through the output hollow shaft of the motor, the mechanical power of the engine is transmitted to the ring gear shaft of the planet row through the output shaft of the engine, and the electric power and the mechanical power are transmitted to the electro-mechanical power collecting shaft through the hollow shaft of the planet carrier, the Z3 gear of the planet carrier output, the Z4 driven gear of the planet carrier output, the input disc of the clutch C2 and the output disc of the clutch C2 after the planet carrier is collected to form an ultra-low speed crawling stepless speed change mode of the collected power.

To achieve the above object, the present invention provides another dual-mode power splitting and converging continuously variable transmission system, comprising: an output shaft of the engine is fixedly connected with a rotor of the generator, concentrically penetrates through an output hollow shaft of the motor and is fixedly connected with a planetary gear ring shaft; the rotor of the motor is fixedly connected with the input disc of the clutch C1 and the sun gear shaft of the planet row through the output hollow shaft of the motor; the planet carrier hollow shaft is fixedly connected with the planet carrier and an output disc of the clutch C2; the power output shaft concentrically penetrates through the hollow shaft of the planet carrier and then is fixedly connected with the planet row gear ring shaft; the output disc of the clutch C1 is fixedly connected with a gear of a motor output Z1; the planet carrier output Z3 gear is fixedly connected with the input disc of the clutch C2; the electromechanical power confluence shaft is fixedly connected with a motor output Z2 gear and a planet carrier output Z4 driven gear at the same time; the engine output shaft, the motor output hollow shaft, the planet row sun gear shaft, the planet row gear ring shaft and the planet carrier form a branch and confluence device of the engine power.

To achieve the above object, the present invention provides a dual-mode power splitting and converging continuously variable transmission system, comprising: an output shaft of the engine is fixedly connected with a rotor of the generator, concentrically penetrates through an output hollow shaft of the motor and is fixedly connected with a planetary gear ring shaft; the motor rotor is fixedly connected with a motor output Z1 gear and a planet row sun gear shaft through a motor output hollow shaft; the planet carrier hollow shaft is fixedly connected with the planet carrier and an output disc of the clutch C2; the power output shaft concentrically penetrates through the hollow shaft of the planet carrier and then is fixedly connected with the planet row gear ring shaft; the planet carrier output Z3 gear is fixedly connected with the input disc of the clutch C2; the electromechanical power confluence shaft is fixedly coupled with an input disc of the clutch C1 and a driven gear of the planet carrier output Z4; and the output disc of the clutch C1 is fixedly connected with the motor output Z2 gear; the engine output shaft, the motor output hollow shaft, the planet row sun gear shaft, the planet row gear ring shaft and the planet carrier form a branch and confluence device of the engine power.

To achieve the above object, the present invention provides another dual-mode power splitting and converging continuously variable transmission system, including: an output shaft of the engine is fixedly connected with a rotor of the generator, concentrically penetrates through an output hollow shaft of the motor and is fixedly connected with a planetary gear ring shaft; the motor rotor is fixedly connected with a motor output Z1 gear and a planet row sun gear shaft through a motor output hollow shaft; the planet carrier hollow shaft is fixedly connected with the planet carrier and the planet carrier output Z3 gear; the power output shaft concentrically penetrates through the hollow shaft of the planet carrier and then is fixedly connected with the planet row gear ring shaft; the electromechanical power confluence shaft is fixedly connected with an input disc of the clutch C1 and an output disc of the clutch C2; the motor output Z2 gear is fixedly connected with the output disc of the clutch C1; the planet carrier output Z4 driven gear is fixedly connected with the input disc of the clutch C2; the engine output shaft, the motor output hollow shaft, the planet row sun gear shaft, the planet row gear ring shaft and the planet carrier form a branch and confluence device of the engine power.

To achieve the above object, the present invention provides another dual-mode power splitting and converging continuously variable transmission system, including: an output shaft of the engine is fixedly connected with a rotor of the generator, concentrically penetrates through an output hollow shaft of the motor and is fixedly connected with a sun gear shaft of the planet row; the rotor of the motor is fixedly connected with the input disc of the clutch C1 and the planetary gear ring shaft through a motor output hollow shaft; the planet carrier hollow shaft is fixedly connected with the planet carrier and the planet carrier output Z3 gear; the power output shaft concentrically penetrates through the hollow shaft of the planet carrier and then is fixedly connected with the sun gear shaft of the planet row; the output disc of the clutch C1 is fixedly connected with a gear of a motor output Z1; the electromechanical power confluence shaft is fixedly connected with a Z2 gear output of the motor and an output disc of the clutch C2; the planet carrier output Z4 driven gear is fixedly connected with the input disc of the clutch C2; the engine output shaft, the planet row sun wheel shaft, the planet row gear ring shaft and the planet carrier form a branch and confluence device of the engine power.

Compared with the prior art, the utility model discloses a stepless speed change transmission system that double mode power divides to converge has following beneficial effect: the scheme provides a power transmission route of the dual-mode CVT, and details the combination of a specific power flow route and parts for realizing the dual-mode CVT; the core key points of the power transmission route of the dual-mode CVT are as follows: when the tractor operates at low speed and high speed, a double-motor series CVT power transmission route is adopted, the quantity and complexity of parts of a mechanical transmission system are greatly reduced, and the reliability is greatly improved. When the tractor operates at full power and high traction force, the power splitting and converging transmission line is adopted, the decoupling of the engine and the torque and speed of the whole tractor is kept, the engine can work in an operation interval with low oil consumption, the efficiency of a tractor transmission system is greatly improved, the operation efficiency of the whole tractor is improved, and the oil consumption is reduced. Two CVT power routes can be switched automatically, the respective advantage characteristics of an engine and a motor are exerted, good control comfort can be obtained, and the operation intensity of a manipulator is greatly reduced. Because the motor is adopted to realize the function of the CVT, a good foundation for automatic control is established for the unmanned tractor in the future. The system is particularly suitable for being applied to transmission systems of large tractors with horsepower of 80-300 and above.

Drawings

FIG. 1 is a schematic structural arrangement of a continuously variable transmission system according to an embodiment of the present invention;

FIG. 2 is a schematic block diagram of the structural arrangement of another embodiment of the continuously variable transmission system of the embodiment of FIG. 1;

FIG. 3 is a schematic structural arrangement of a continuously variable transmission system of yet another embodiment of the embodiment of FIG. 1;

FIG. 4 is a schematic block diagram of the structural arrangement of a continuously variable transmission system of yet another embodiment of the embodiment of FIG. 1;

FIG. 5 is a schematic structural arrangement of a continuously variable transmission system according to another embodiment of the present invention;

FIG. 6 is a schematic structural arrangement of another embodiment of the continuously variable transmission of the embodiment of FIG. 5;

FIG. 7 is a schematic structural arrangement of a continuously variable transmission system of yet another embodiment of the embodiment of FIG. 1;

FIG. 8 is a schematic structural arrangement of a continuously variable transmission system in accordance with yet another embodiment of the embodiment of FIG. 1.

Description of the main reference numerals:

1-engine flywheel; 2-an engine output shaft; 3-a generator rotor; 4-a motor rotor; 5-the motor shares the shell; 6-output hollow shaft of motor; 7-Clutch C1 input disc; 8-Clutch C1 output disc; 9-motor output Z1 gear; 10-planet row sun gear shaft; 11-planet row gear ring shaft; 12-a planet carrier; 13-planet carrier output Z3 gear; 14-planet carrier hollow shaft; 15-central drive input gear shaft; 16-a gearbox output shaft; 17-planet carrier output Z4 driven gear; 18-Clutch C2 input disc; 19-clutch C2 output plate; 20-an electromechanical power bus shaft; 21-motor output Z2 gear, 22-power output shaft.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1, a two-mode power splitting and combining continuously variable transmission system according to a preferred embodiment of the present invention includes: the output shaft 2 of the engine is fixedly connected with the rotor 3 of the generator, then concentrically penetrates through the hollow output shaft 6 of the motor and is fixedly connected with the planetary gear ring shaft 11. The motor rotor 4 is fixedly coupled to both the input disc 7 of the clutch C1 and the planet carrier sun gear shaft 10 via the hollow motor output shaft 6. The hollow carrier shaft 14 is fixedly connected to the carrier 12. The power output shaft 22 concentrically penetrates through the planet carrier hollow shaft 14 and is fixedly connected with the planet row ring gear shaft 11. The clutch C1 output plate 8 is fixedly coupled to the motor output Z1, gear 9. The planet carrier output Z3 gear 13 is fixedly coupled to the planet carrier hollow shaft 14. The electromechanical power bus shaft 20 is fixedly coupled to both the motor output Z2 gear 21 and the clutch C2 output plate 19. And the planet carrier output Z4 driven gear 17 is fixedly coupled to the input disc 18 of clutch C2. The engine output shaft 2, the motor output hollow shaft 6, the planet row sun gear shaft 10, the planet row ring gear shaft 11 and the planet carrier 12 form a branch and confluence device of engine power.

In some embodiments, the present invention provides a dual mode power splitting and converging continuously variable transmission system capable of achieving multiple continuously variable power output modes, wherein the split mode of the engine power comprises:

1) the engine power is distributed with different proportions of power according to the requirements of the control device and is distributed to the generator rotor 3 through the engine output shaft 2 to generate electricity, so that a mechanical power conversion electric power mode is formed.

2) The electric power of the generator rotor 3 is distributed to the motor rotor 4 by the control device and controls the required electric power, thereby forming an electric power-to-mechanical power mode.

3) A portion of the engine power is distributed via the engine output shaft 2 to the planet carrier shaft 11, thus forming a mechanical power split mode.

4) The electric power of the motor rotor 4 is distributed to the planetary row sun gear shaft 10 through the motor output hollow shaft 6 according to the requirements of the control device, so that a motor power splitting mode is formed.

In some embodiments, the split mechanical power split mode power and the split electric machine power split mode power are combined to the mechanical-electrical power bus shaft 20 through the planet carrier 12, the hollow planet carrier shaft 14, the planet carrier output Z3 gear 13, the planet carrier output Z4 driven gear 17, the clutch C2 input disc 18, and the clutch C2 output disc 19 to form a combined electric machine power output mode. The power of the electromechanical power bus shaft 20 is output to the gearbox output shaft 16 through different gear positions of the gear sets of the gearbox, and the wheels are driven through the central transmission input gear shaft 16.

In the confluence power output mode, the engine output shaft 2 is directly connected with the generator rotor 3, the power distribution proportion of the generator rotor 3 obtained from the engine output shaft 2 is determined by the rotating speed and the load of the hollow shaft 14 of the planet carrier, and in order to achieve the load balance with the external system of the vehicle, the torque and the rotating speed of the sun gear shaft 10 of the planet row need to meet a fixed output relational expression. The electric output power of the generator rotor 3 is adjusted to the mechanical output power of the engine output shaft 2 through the controller, the specific rotating speed and torque proportional relation of the planet row is achieved, the power output requirement of the motor rotor 4 is met, and further the speed change requirement of a vehicle is met.

In some embodiments, when clutch C1 input disc 7 is engaged with clutch C1 output disc 8, clutch C2 input disc 18 is disengaged from clutch C2 output disc 19, and carrier output Z4 is idle with gear 17, all of the engine power is transferred to generator rotor 3 via engine output shaft 2 to generate electricity, all of the generator rotor 3 power is supplied to motor rotor 4 via the control device, and all of the motor rotor 4 power is transferred to the electro-mechanical power sink shaft 20 via motor output hollow shaft 6, clutch C1 input disc 7, clutch C1 output disc 8, motor output Z1 gear 9, and motor output Z2 gear 21 to form a dual-motor series all-electric power output mode. The power of the electromechanical power bus shaft 20 is output to the gearbox output shaft 16 through different gear positions of the gear sets of the gearbox, and the wheels are driven through the central transmission input gear shaft 16.

In the full electric power output mode, the rotational speed of the hollow carrier shaft 14 is continuously changed according to the accelerator opening of the driver and the change of the external load of the vehicle. The adjustment of the rotating speed and the torque of the hollow planet carrier shaft 14 is obtained by the change of the rotating speed and the torque of the sun gear shaft 10 of the planet row drawn by the motor rotor 4, under the condition that the opening degree of the accelerator is not changed, when the load of the whole vehicle is reduced, the torque demand of the hollow planet carrier shaft 14 is reduced, the rotating speed of the engine is increased, and meanwhile, the rotating speed of the motor rotor 4 connected with the sun gear shaft 10 of the planet row is increased under the regulation and control of the motor controller to drive the hollow planet carrier shaft 14 to increase the speed. When the load of the whole vehicle is increased, the rotating speed of the hollow shaft 14 of the planet carrier is reduced, the rotating speed of the engine is reduced, the torque is increased, the controller regulates the electromechanical power distribution proportion output by the engine, the rotating speed of the rotor 4 of the motor is reduced, and the torque is increased. The torque of the hollow shaft 14 and the planet carrier 12 of the planet carrier is increased according to the torque proportion determined by the planet row characteristics of the planet row ring gear shaft 11 and the planet row sun gear shaft 10, the balance is achieved with the load of the whole vehicle, and the CVT function of continuous speed change and torque change is realized.

The utility model discloses a double mode power divides infinitely variable transmission system's that converges power transmission route as follows:

1) a power splitting stage:

(1) the method comprises the steps of (1) engine flywheel 1 → engine output shaft 2 → generator rotor 3 generates electricity (proportion split electric power) → after rectification and inversion by a control device → motor rotor 4 motor traction speed regulation → output to planetary row sun gear shaft 10 through motor output hollow shaft 6.

(2) The engine flywheel 1 → the planet row ring gear shaft 11 splits the remaining mechanical power of the engine → the planet row ring gear shaft 11.

2) A power converging stage:

the power of the planet row ring gear shaft 11 plus the power of the planet row sun gear shaft 10 → the planet carrier 12 → the planet carrier output Z3 gear 13 → the planet carrier output Z4 driven gear 17, the clutch C2 input disc 18, the clutch C2 output disc 19 → the electromechanical power sink shaft 20 → the different gear outputs of the gearsets passing through the gearbox to the gearbox output shaft 16 → the central transmission input gear shaft 16 drives the wheels.

The change of speed and torque required by the vehicle is completed at the planet row through the shunting and confluence of the power of the engine, and the function of a continuous stepless speed change CVT is realized.

In actual working condition operation, the tractor has wide operation speed, the output speed range of full-power operation is from 0.2 to 20km/h, and the field and road transportation speed range is from 20 to 50 km/h. The full power output and walking are met within the range of 0.2-20km/h, and very complex design requirements are provided for a transmission system of a large-horsepower tractor with over 200 horsepower. Meanwhile, if the system adopts the double-motor power splitting and converging CVT to change the speed in the full speed range, the angular power of the double motors is 5-6 times of the rated power, the motors need low-speed large torque and high-speed small torque, the size and the cost of the motors and the controller are greatly improved, and the speed change system surrounding the motors is very complex.

The utility model discloses a double mode power divides infinitely variable transmission system who converges proposes CVT system's double mode configuration, and bi-motor series connection mode is used for 0-5 km/h's low-speed operation operating mode to and 30-50 km/h's high-speed transportation operating mode. The power splitting and converging CVT system has high efficiency and is mainly used for the full-load working condition of 5-20 km/h. The two modes of the continuously variable transmission system are automatically switched according to a control law or a driver requirement.

In some embodiments, the dual mode power splitting and converging cvt of the present invention can realize multiple dual-motor series cvt output modes, such as a reverse mode, an ultra-low speed creep mode, a power generation mode, and an energy recovery management mode.

A reversing mode: at this time, the control device controls the motor rotor 4 to rotate in reverse, and when the input disc 7 of the clutch C1 is engaged with the output disc 8 of the clutch C1, and the input disc 18 of the clutch C2 is disengaged from the output disc 19 of the clutch C2, the power of the motor rotor 4 is output to the electromechanical power sink shaft 20 through the motor output hollow shaft 6, the input disc 7 of the clutch C1, the output disc 8 of the clutch C1, the motor output Z1 gear 9 and the motor output Z2 gear 21 to form a reverse mode of full electric power output.

In the ultra-low speed crawling mode: at this time, the control device controls the motor rotor 4 to be in a constant torque low-speed section, and the ultra-low speed creep mode includes:

when the input disc 7 of the clutch C1 is combined with the output disc 8 of the clutch C1, and the input disc 18 of the clutch C2 is separated from the output disc 19 of the clutch C2, the power of the rotor 4 of the motor is output to the electromechanical power sink shaft 20 through the hollow output shaft 6 of the motor, the input disc 7 of the clutch C1, the output disc 8 of the clutch C1, the gear 9 of the motor output Z1 and the gear 21 of the motor output Z2 to form an ultra-low speed crawling mode of full electric power output.

When the input disc 7 of the clutch C1 is separated from the output disc 8 of the clutch C1, the input disc 18 of the clutch C2 is combined with the output disc 19 of the clutch C2, the power of the rotor 4 of the motor is transmitted to the planet row sun gear shaft 10 through the hollow output shaft 6 of the motor, the mechanical power of the engine is transmitted to the planet row ring gear shaft 11 through the output shaft 2 of the engine, and the electric power and the mechanical power are transmitted to the electromechanical power confluence shaft 20 through the hollow planet carrier shaft 14, the planet carrier output Z3 gear 13, the planet carrier output Z4 driven gear 17, the input disc 18 of the clutch C2 and the output disc 19 of the clutch C2 after the planet carrier 12 is confluent to form an ultra-low speed crawling mode of confluent power.

And (3) generating mode: when the input disc 7 of the clutch C1 is separated from the output disc 8 of the clutch C1 and the input disc 18 of the clutch C2 is separated from the output disc 19 of the clutch C2, the generator rotor 3 can output constant power, and the electric power is rectified by the control device and then is output outwards.

Energy recovery management mode: the energy such as braking, idling and the like can be completely recovered when the tractor is transported in the field, and the energy recovery process is not elaborated again in detail in view of the fact that the tractor is a full-load continuous operation machine tool and the working condition of recovering the energy is not too many.

The utility model discloses a double mode power divides infinitely variable transmission system who converges adopts bimodulus CVT configuration, has realized the whole continuous variable speed ability of retrograde motion, creep, operation, high-speed transportation operating mode.

In some embodiments, the two-mode power splitting and combining cvt of the present invention further has the following three embodiments, as shown in fig. 2-4, which mainly combine the clutch C1 and the clutch C2 at different positions to achieve the same function as the embodiment shown in fig. 1.

To achieve the above object, as shown in fig. 2, the present invention provides another dual-mode power splitting and converging continuously variable transmission system, including: the output shaft 2 of the engine is fixedly connected with the rotor 3 of the generator, then concentrically penetrates through the hollow output shaft 6 of the motor and is fixedly connected with the planetary gear ring shaft 11. The motor rotor 4 is fixedly coupled to both the input disc 7 of the clutch C1 and the planet carrier sun gear shaft 10 via the hollow motor output shaft 6. Carrier sleeve 14 is fixedly coupled to both carrier 12 and the output plate 19 of clutch C2. The power output shaft 22 concentrically penetrates through the planet carrier hollow shaft 14 and is fixedly connected with the planet row ring gear shaft 11. The clutch C1 output plate 8 is fixedly coupled to the motor output Z1, gear 9. The carrier output Z3, gear 13, is fixedly coupled to the input disc 18 of the clutch C2. And the electromechanical power bus shaft 20 is fixedly coupled to both the motor output Z2 gear 21 and the carrier output Z4 driven gear 17. The engine output shaft 2, the motor output hollow shaft 6, the planet row sun gear shaft 10, the planet row ring gear shaft 11 and the planet carrier 12 form a branch and confluence device of the engine power.

To achieve the above object, as shown in fig. 3, the present invention provides a dual-mode power splitting and converging continuously variable transmission system, comprising: the output shaft 2 of the engine is fixedly connected with the rotor 3 of the generator, then concentrically penetrates through the hollow output shaft 6 of the motor and is fixedly connected with the planetary gear ring shaft 11. The motor rotor 4 is fixedly coupled to both the motor output Z1 gear 9 and the planet row sun gear shaft 10 via the motor output hollow shaft 6. Carrier sleeve 14 is fixedly coupled to both carrier 12 and the output plate 19 of clutch C2. The power output shaft 22 concentrically penetrates through the planet carrier hollow shaft 14 and is fixedly connected with the planet row ring gear shaft 11. The carrier output Z3, gear 13, is fixedly coupled to the input disc 18 of the clutch C2. The electromechanical power sink shaft 20 is fixedly coupled to both the clutch C1 input disc 7 and the carrier output Z4 driven gear 17. And the clutch C1 output plate 8 is fixedly coupled to the motor output Z2 gear 21. The engine output shaft 2, the motor output hollow shaft 6, the planet row sun gear shaft 10, the planet row ring gear shaft 11 and the planet carrier 12 form a branch and confluence device of engine power.

To achieve the above object, as shown in fig. 4, the present invention provides a dual-mode power splitting and converging continuously variable transmission system, comprising: the output shaft 2 of the engine is fixedly connected with the rotor 3 of the generator, then concentrically penetrates through the hollow output shaft 6 of the motor and is fixedly connected with the planetary gear ring shaft 11. The motor rotor 4 is fixedly coupled to both the motor output Z1 gear 9 and the planet row sun gear shaft 10 via the motor output hollow shaft 6. Planet carrier hollow shaft 14 is fixedly coupled to both planet carrier 12 and planet carrier output Z3 gear 13. The power output shaft 22 concentrically penetrates through the planet carrier hollow shaft 14 and is fixedly connected with the planet row ring gear shaft 11. The electromechanical power bus shaft 20 is fixedly coupled to both the input plate 7 of the clutch C1 and the output plate 19 of the clutch C2. The motor output Z2, gear 21, is fixedly coupled to the clutch C1 output disc 8. And the planet carrier output Z4 driven gear 17 is fixedly coupled to the input disc 18 of clutch C2. The engine output shaft 2, the motor output hollow shaft 6, the planet row sun gear shaft 10, the planet row ring gear shaft 11 and the planet carrier 12 form a branch and confluence device of the engine power.

In some embodiments, the two-mode power splitting and converging continuously variable transmission system of the present invention may further have an embodiment as shown in fig. 5, which mainly turns the planetary gear mechanism by 180 degrees, and also can perform the same function as the embodiment shown in fig. 1.

To achieve the above object, as shown in fig. 5, the present invention provides a dual-mode power splitting and converging continuously variable transmission system, comprising: the output shaft 2 of the engine is fixedly connected with the rotor 3 of the generator, then concentrically passes through the hollow output shaft 6 of the motor and is fixedly connected with the sun gear shaft 10 of the planet row. The motor rotor 4 is fixedly coupled to both the input disk 7 of the clutch C1 and the planetary gear shaft 11 via the hollow motor output shaft 6. Planet carrier hollow shaft 14 is fixedly coupled to both planet carrier 12 and planet carrier output Z3 gear 13. The power output shaft 22 concentrically penetrates through the hollow shaft 14 of the planet carrier and is fixedly connected with the sun gear shaft 10 of the planet row. The clutch C1 output plate 8 is fixedly coupled to the motor output Z1, gear 9. The electromechanical power bus shaft 20 is fixedly coupled to both the motor output Z2 gear 21 and the clutch C2 output plate 19. And the planet carrier output Z4 driven gear 17 is fixedly coupled to the input disc 18 of clutch C2. The engine output shaft 2, the planet row sun gear shaft 10, the planet row ring gear shaft 11 and the planet carrier 12 form a splitting and converging device of engine power.

To sum up, the utility model discloses a stepless speed change transmission system that double mode power divides to converge has following beneficial effect:

1. the engine is decoupled with the traction force and the speed of the vehicle in two CVT modes, so that the engine can be kept to stably run in an ideal design interval with low oil consumption and low emission under the condition of meeting the power demand of the vehicle, and the aims of saving oil and reducing emission of the whole vehicle are fulfilled.

2. In the power splitting and converging CVT mode, the power of an engine is split into two power routes through independent actions of a planet row and two motors, one power route is a mechanical power route, the other power route is a mechanical-electric-power route, and the CVT function of a transmission system is realized through the power splitting and converging principle. In the mode, the mechanical power of the partial engine is directly transmitted to the vehicle transmission system, so that the transmission efficiency is more than 10% higher than that in the full-electric mode, and the full-electric mode is suitable for the operation requirement of full power and high horsepower. In the mode, the power transmission route is shortened, the number of speed change parts such as gears and shafts of the transmission system is greatly reduced, the axial space of the transmission system is saved, and the efficiency of the transmission route is improved.

3. In the double-motor serial CVT mode, the power of the engine is completely converted into electric power, the CVT function is directly realized by the characteristics of the motor, and the double-motor serial CVT is suitable for low-speed and high-speed transportation operation under partial power; because CVT modes under different working conditions are adopted, the scheme can realize the CVT speed regulation function of the high-horsepower tractor by using a high-speed low-power motor (1/3-1/2 of the power of an engine), thereby greatly reducing the cost of a transmission system, saving the design space and improving the reliability.

4. The power splitting and converging device adopts a double-motor and planetary differential mode, is different from a plunger pump/motor transmission system of a hydraulic power splitting scheme (HMCVT), and has the following motor performances: the response speed is 2-3 times faster than that of a hydraulic pump system, the speed control accuracy is superior to that of a hydraulic pump/motor system, and the average efficiency is superior to that of a hydraulic system by nearly 15%. The use and maintenance cost is as follows: the motor is simple and reliable to maintain, no running pollution is generated, the requirements on the cleanliness of the hydraulic pump and the motor are extremely high, and the maintenance cost is very high. Cost and purchase: the same power cost of the permanent magnet synchronous motor is about one third of that of a hydraulic pump/motor, and the permanent magnet synchronous motor is still in continuous descending; domestic manufacturers have fully mastered the development and production technology of motors.

5. According to the scheme, two-gear CVT gears and a simple two-gear fixed-shaft gear box are adopted, the operation CVT is selected when the vehicle is stopped during operation, and the operation speed coverage of 0-25 kilometers is realized; when in transportation, a high-speed CVT is selected to cover the range of the transportation speed of 0-50 kilometers. Different from a traditional hydraulic pressure (HMCVT) multi-row planetary mechanism and a wet clutch or a brake which must be adopted, the manufacturing and assembling difficulty is greatly reduced, the number of parts under the same gear is greatly reduced, and the manufacturing cost is reduced; the design reliability of the product is improved, and the use and maintenance cost of the product is reduced.

6. The double motors adopt an AC-DC-AC rectification inversion system, theoretically, an energy storage battery is not needed, electric energy generated by the generators is directly transmitted to the motors to be output, and due to the fact that the batteries and a management system are reduced, system cost is greatly reduced, and system reliability is improved.

7. The scheme does not need to arrange a reverse gear in the gearbox, can realize the designed reverse speed of 0-Vmax km/h by means of the reverse rotation of the motor, and meets various operation requirements of the tractor.

8. The scheme mainly comprises key parts, technologies and products such as a high-power permanent magnet synchronous motor, a motor controller, a high-power discharge battery and the like, wherein domestic manufacturers completely master and produce the high-power permanent magnet synchronous motor on a large scale, and a local purchasing channel is wide. Due to the high reliability and low cost of the motor and the controller, the manufacturing, using and maintaining cost of the transmission system is lower than that of the HMCVT transmission system consisting of the hydraulic components.

9. The scheme is provided with the high-power generator, and the electric power with specified voltage and frequency is output outwards through the standardized output interface, so that the electric power is provided for the operation machines and tools needing the electric power, the emergency rescue operation is performed, and the operation range of the whole machine is expanded.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A two-mode power split-flow continuously variable transmission system comprising:

the engine output shaft is fixedly connected with the generator rotor, concentrically penetrates through the motor output hollow shaft and is fixedly connected with the planet row gear ring shaft;

the motor rotor is fixedly connected with the input disc of the clutch C1 and the sun gear shaft of the planet row at the same time through the output hollow shaft of the motor;

the planet carrier hollow shaft is fixedly connected with the planet carrier;

the power output shaft concentrically penetrates through the hollow shaft of the planet carrier and then is fixedly connected with the planet row gear ring shaft;

a clutch C1 output plate fixedly coupled to the motor output Z1 gear;

a planet carrier output Z3 gear fixedly coupled with the planet carrier hollow shaft;

an electromechanical power sink shaft fixedly coupled to both the motor output Z2 gear and the clutch C2 output plate; and

a planet carrier output Z4 driven gear fixedly coupled to the input disc of clutch C2;

the engine output shaft, the motor output hollow shaft, the planet row sun gear shaft, the planet row gear ring shaft and the planet carrier form a splitting and converging device of engine power.

2. The two-mode power-split, continuously variable transmission system of claim 1, wherein the split mode of engine power comprises:

the engine power is distributed to the generator rotor via the engine output shaft to form a mechanical power conversion electric power mode;

the electric power of the generator rotor is distributed to the motor rotor through a control device to form an electric power conversion mechanical power mode;

the engine power is distributed to the planet row ring gear shaft through the engine output shaft to form a mechanical power split mode; and

electric power of the rotor of the motor is distributed to the sun gear shaft of the planet row through the output hollow shaft of the motor to form a motor power splitting mode.

3. The two-mode power splitting and converging continuously variable transmission system of claim 2, wherein said split mechanical power split mode power and said split electric machine power split mode power converge to a double electric machine series converging power output mode through said planet carrier, said planet carrier hollow shaft, said planet carrier output Z3 gear, said planet carrier output Z4 driven gear, said clutch C2 input disc, said clutch C2 output disc to said electro-mechanical power converging shaft.

4. The two-mode power splitting and combining continuously variable transmission system of claim 2 wherein when said clutch C1 input disc is engaged with said clutch C1 output disc, said clutch C2 input disc is disengaged from said clutch C2 output disc, and said carrier output Z4 driven gear is idle, all of said engine power is transferred through said engine output shaft to said generator rotor for power generation, all of said generator rotor power is supplied through said control means to said motor rotor, all of said motor rotor power is transferred through said motor output hollow shaft, said clutch C1 input disc, said clutch C1 output disc, said motor output Z1 gear, and said motor output Z2 gear to said electromechanical power combining shaft to form a dual-motor series all-electric power output mode.

5. The two-mode power-split continuously variable transmission system of claim 2, wherein the output mode of the split and merge device further comprises:

a reverse mode wherein said control controls said motor rotor to reverse, and when said clutch C1 input disc is engaged with said clutch C1 output disc and said clutch C2 input disc is disengaged from said clutch C2 output disc, power from said motor rotor is output to said electromechanical power bus shaft via said motor output quill, said clutch C1 input disc, said clutch C1 output disc, said motor output Z1 gear, and said motor output Z2 gear to form a full electric power output; and

and in the power generation mode, when the input disc of the clutch C1 is separated from the output disc of the clutch C1 and the input disc of the clutch C2 is separated from the output disc of the clutch C2, the generator rotor can output constant power, and the electric power is rectified by the control device and then is output outwards.

6. The two-mode power split continuously variable transmission system of claim 2, wherein the output modes of the split and merge means further include an ultra low speed creep mode in which the control means controls the motor rotor in a constant torque low speed section, the ultra low speed creep mode including:

when the clutch C1 input disc is engaged with the clutch C1 output disc and the clutch C2 input disc is disengaged from the clutch C2 output disc, the power of the motor rotor is output to the electromechanical power bus shaft via the motor output quill, the clutch C1 input disc, the clutch C1 output disc, the motor output Z1 gear, and the motor output Z2 gear to form a full electric power output extra-low speed creep mode; and

when the input disc of the clutch C1 is separated from the output disc of the clutch C1, and the input disc of the clutch C2 is combined with the output disc of the clutch C2, the power of the rotor of the motor is transmitted to the sun gear shaft of the planet row through the hollow output shaft of the motor, the mechanical power of the engine is transmitted to the ring gear shaft of the planet row through the output shaft of the engine, and the electric power and the mechanical power are transmitted to the electro-mechanical power collecting shaft through the hollow carrier shaft, the Z3 gear of the planet carrier output, the Z4 driven gear of the planet carrier output, the input disc of the clutch C2 and the output disc of the clutch C2 after the planet carrier is collected to form an ultra-low-speed crawling stepless speed change mode of the collected power.

7. A two-mode power split-flow continuously variable transmission system comprising:

the planet carrier hollow shaft is fixedly connected with the planet carrier and the output disc of the clutch C2 at the same time;

a clutch C1 output plate fixedly coupled to the motor output Z1 gear;

a planet carrier output, gear Z3, fixedly coupled to the input disc of clutch C2; and

an electromechanical power sink shaft fixedly coupled to both the motor output Z2 gear and the carrier output Z4 driven gear;

8. A two-mode power split-flow continuously variable transmission system comprising:

the motor rotor is fixedly connected with the motor output Z1 gear and the planet row sun gear shaft simultaneously through the motor output hollow shaft;

a planet carrier output, gear Z3, fixedly coupled to the input disc of clutch C2;

an electromechanical power sink shaft fixedly coupled to both the clutch C1 input disc and the carrier output Z4 driven gear; and

a clutch C1 output plate fixedly coupled to the motor output Z2 gear;

9. A two-mode power split-flow continuously variable transmission system comprising:

the planet carrier hollow shaft is fixedly connected with the planet carrier and the planet carrier output Z3 gear at the same time;

an electromechanical power sink shaft fixedly coupled to both the input disc of clutch C1 and the output disc of clutch C2;

a motor output Z2 gear fixedly coupled to the clutch C1 output disc; and

10. A two-mode power split-flow continuously variable transmission system comprising:

the engine output shaft is fixedly connected with the generator rotor, concentrically penetrates through the motor output hollow shaft and is fixedly connected with the planet row sun gear shaft;

the motor rotor is fixedly connected with the input disc of the clutch C1 and the planet row ring gear shaft at the same time through the motor output hollow shaft;

the power output shaft penetrates through the hollow shaft of the planet carrier concentrically and then is fixedly connected with the sun gear shaft of the planet row;

a clutch C1 output plate fixedly coupled to the motor output Z1 gear;

the engine output shaft, the planet row sun gear shaft, the planet row gear ring shaft and the planet carrier form a splitting and converging device of engine power.