CN214728153U - Electric drive type tractor CVT power assembly with rear-mounted electric PTO structure - Google Patents

Abstract

The utility model provides an electricity that hangs behind power PTO structure drives formula tractor CVT power assembly with electricity, include: the power transmission system comprises an engine, a generator, a first motor, a second motor, a PTO transmission case, an electric drive front axle and an energy storage unit, wherein the electric drive front axle is provided with a front axle motor; the first motor and the second motor are hub motors, the engine is in transmission connection with a generator, the generator is a flywheel integrated motor, and the PTO motor is in transmission connection with a PTO transmission box and used for providing output power; the energy storage unit is electrically connected with the first motor, the second motor, the front axle motor, the PTO motor and the generator respectively; the utility model provides an electricity drive formula tractor CVT power assembly of back string electricity PTO structure utilizes the big moment of torsion of motor low-speed, the wide characteristic of rotational speed scope, does not carry out the gearbox gear and switches, directly uses the motor speed governing, has realized the infinitely variable of operation process.

Description

Electric drive type tractor CVT power assembly with rear-mounted electric PTO structure

Technical Field

The utility model belongs to the technical field of the transmission, concretely relates to electric drive formula tractor CVT power assembly of back string electricity PTO structure.

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.

The manual gear shifting transmission system is adopted, when the tractor works in the field, due to the fact that land resistance changes greatly and the load change of the whole tractor is large, the tractor adopting the manual gear shifting transmission system needs to be frequently stopped and shifted to meet the requirements of traction force and speed of farm tool operation, the working intensity of workers is high, 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 method is characterized in that a tractor power uninterrupted automatic gear shifting transmission system is adopted, and the gear shifting process is carried out under the condition that the power from an engine to a gearbox is uninterrupted; the wet-type multi-plate clutch is used as a gear shifting executing mechanism, when gears need to be changed, two clutches for gear shifting are sequentially separated and combined according to the change of control oil pressure, and gear shifting without stopping is achieved during vehicle load running, so that the problem of stopping and gear shifting during manual gear shifting transmission system operation is solved, the operation intensity of workers is reduced, and the operation comfort and the operation efficiency are improved. But has the following major disadvantages:

the engine speed of the uninterrupted automatic power 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 speed, 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.

Due to the fact that the tractor has multiple operation requirements and multiple 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; due to the consistency, the gear shifting performance of the transmission system needs to be debugged and calibrated on a special delivery test bed, the abrasion of a clutch is increased along with the increase of the service time, the gear shifting control time is changed, the smoothness is poor, and gear shifting impact is generated.

At present, the technology of the systems is basically mastered by foreign companies and mainly depends on import, and the transmission system has the disadvantages of complex structure, high price, difficult price reduction and high maintenance cost. For reasons of price, in advanced countries of the world, powershift transmissions are mostly applied to 80-200Hp tractor products.

The traditional power gear shifting gearbox is in single-power line stepped transmission, realizes super crawling gears (ultra-low speed), and needs to be added with a plurality of complex reduction gear trains. Furthermore, the stepless transmission during the main operations such as rotary tillage and the like cannot be realized, i.e. the optimal running speed of the rotary cultivator cannot be matched theoretically.

Adopt hydraulic pressure machinery infinitely variable transmission drive system (HMCVT), this drive system comprises hydraulic pressure plunger variable displacement pump/motor/multirow planetary mechanism/wet clutch and stopper, and the main advantage is: the power of the engine (1) is divided into two power routes through the planet row, one route is a mechanical power route, and the power is directly transmitted to an input shaft of the gearbox (4); one is a hydraulic power route, and after the machine-liquid-machine power conversion process, the hydraulic power route and the input shaft of the gearbox (4) realize the confluence of all power; 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 speed and the traction requirement of the vehicle, and the traction and the speed requirement of the vehicle during speed change can be ensured. The transmission system (HMCVT) realizes stepless automatic change 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 (irrelevant) with the speed and the traction of the whole vehicle, the engine can stably work in a low oil consumption area, and has small vibration and good emission.

The drive train (HMCVT) has the following disadvantages:

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 gear box of the system adopts a multi-row planetary mechanism and a wet clutch or a brake to realize the regional change of 4-6 gears, the system has a large number of parts and a complex structure, the key technology of the system is basically mastered by foreign companies, products mainly depend on import, and the transmission gear box has high cost and difficult price reduction.

The transmission efficiency of the transmission system is low, the maximum transmission efficiency can only reach about 80%, and the transmission system has low efficiency and poor fuel economy compared with other transmission systems.

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.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electricity drive formula tractor CVT power assembly of back string electricity PTO structure aims at realizing the decoupling zero of engine and speed of a motor vehicle, PTO transmission case through the architectural design of power assembly.

For realizing above-mentioned technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:

the utility model provides an electricity that hangs behind power PTO structure drives formula tractor CVT power assembly with electricity, include: the power transmission system comprises an engine, a generator, a first motor, a second motor, a PTO transmission case, an electric drive front axle and an energy storage unit, wherein the electric drive front axle is provided with a front axle motor; the first motor and the second motor are hub motors, a rotor of the first motor is in transmission connection with a hub of the left rear wheel, and a rotor of the second motor is in transmission connection with a hub of the right rear wheel; the engine is in transmission connection with the generator, the generator is a flywheel integrated motor, and the PTO motor is in transmission connection with the PTO transmission box and used for providing output power; the energy storage unit is electrically connected with the first motor, the second motor, the front axle motor, the PTO motor and the generator respectively.

As a further improvement of the present invention, the present invention further comprises: the energy storage unit is electrically connected with the high-voltage distribution box and is also electrically connected with the first motor, the second motor, the front axle motor, the PTO motor and the generator respectively through the high-voltage distribution box.

As a further improvement of the present invention, the present invention further comprises: and the charge and discharge interface is electrically connected with the high-voltage distribution box.

The utility model has the advantages that:

the utility model provides an electricity drive formula tractor CVT power assembly of back string electricity PTO structure utilizes the big moment of torsion of motor low-speed, the wide characteristic of rotational speed scope, does not carry out the gearbox gear and switches, directly uses the motor speed governing, has realized the infinitely variable of operation process. The motor has the characteristics of low speed, large torque and wide speed regulation range, realizes the decoupling of the rotating speed and the vehicle speed of the engine, and has high operation efficiency. The turning radius is small: the wheels on each side are independently controlled to drive in four directions in time-sharing and full time. The motor rotates reversely, and backing is convenient; high transmission efficiency (relative to HMCVT); the battery is used for assisting in power supply, the motor has short-time overload capacity, and the climbing and sill-passing capacity is strong; the motor has large torque and good starting performance of the engine; the whole vehicle starts quickly and has good acceleration; the motor stably runs at a low speed, so that the tractor can crawl at an ultra-low speed; the engine speed and the vehicle speed are decoupled, energy recovery is combined, and oil can be saved in the running process; when the load is small, such as turning in the operation process, the capacity can be recovered, and the oil saving is realized.

Drawings

Fig. 1 is a schematic structural view of an electric drive tractor CVT power assembly having a rear hitch electric PTO configuration according to the present invention;

fig. 2 is a schematic circuit wiring diagram of an electric drive tractor CVT power assembly having a rear suspension PTO structure.

In the figure: 101-engine, 102-generator, 103-PTO motor, 104-PTO transmission box, 105-electric drive front axle, 106-front axle motor, 107-left rear wheel, 108-first motor, 109-right rear wheel, 110-second motor, 111-energy storage unit, 112-high voltage distribution box, 113-charge and discharge interface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail by the following embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The embodiment of the utility model provides an electrically drive formula tractor CVT power assembly of rear hitch electric PTO structure is provided in the embodiment, as shown in figure 1, include: the power transmission system comprises an engine 101, a generator 102, a first motor 108, a second motor 110, a PTO motor 103, a PTO transmission box 104, an electric drive front axle 105 and an energy storage unit 111, wherein a front axle motor 106 is arranged on the electric drive front axle 105; the first motor 108 and the second motor 110 are hub motors, which may be commercially available or have a structure disclosed in the prior art (publication number: CN 104734417A); the rotor of the first motor 108 is in transmission connection with the hub of the left rear wheel 107, and the rotor of the second motor 110 is in transmission connection with the hub of the right rear wheel 109; the engine 101 is in transmission connection with the generator 102, the generator 102 adopts a flywheel integrated motor, and the flywheel integrated motor can adopt a structure disclosed in the prior art (publication number: CN 207573184U); the PTO motor 103 is in transmission connection with the PTO transmission box 104 and is used for providing output power, and the engine 101 is in transmission decoupling with the electric drive front axle 105, the left rear wheel 107, the right rear wheel 109 and the PTO transmission box 104; the energy storage unit 111 is electrically connected to the first motor 108, the second motor 110, the front axle motor 106, the PTO motor 103 and the generator, respectively, and is configured to absorb electric energy transmitted by the generator 102 and provide electric energy to the first motor 108, the second motor 110, the front axle motor 106 and the PTO motor 103.

In one embodiment, as shown in fig. 2, in order to better organize the distribution of energy, a high voltage distribution box 112 may be further employed, the energy storage unit 111 is electrically connected to the high voltage distribution box 112, the energy storage unit 111 is further electrically connected to the first motor 108, the second motor 110, the front axle motor 106, the PTO motor 103 and the generator 102 through the high voltage distribution box 112, the high voltage distribution box 112 may transmit the electric energy converted by the generator 102 to the energy storage unit 111, and the high voltage distribution box 112 may further distribute the electric energy of the energy storage unit 111 to the first motor 108, the second motor 110, the front axle motor 106 and the PTO motor 103; the high voltage distribution box 112 of the present embodiment may be a commercially available product or an apparatus disclosed in the prior art (publication No. CN 108657088A).

In an embodiment, with continued reference to fig. 2, in order to perform charging and discharging more optimally, a charging and discharging interface 113 may be further assembled, the charging and discharging interface 113 is electrically connected to the high voltage distribution box 112, and charging to an external device or charging to the energy storage unit 111 may be performed through the charging and discharging interface 113.

Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with a feature, structure, or characteristic of one or more other embodiments without limitation, as long as the combination is not logical or operational. Additionally, the various elements of the drawings of the present application are merely schematic illustrations and are not drawn to scale.

Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.

Claims (3)

1. An electric drive tractor CVT powertrain of a rear hitch electric PTO configuration, comprising: the power transmission system comprises an engine, a generator, a first motor, a second motor, a PTO transmission case, an electric drive front axle and an energy storage unit, wherein the electric drive front axle is provided with a front axle motor; the first motor and the second motor are hub motors, a rotor of the first motor is in transmission connection with a hub of the left rear wheel, and a rotor of the second motor is in transmission connection with a hub of the right rear wheel; the engine is in transmission connection with the generator, the generator is a flywheel integrated motor, and the PTO motor is in transmission connection with the PTO transmission box and used for providing output power; the energy storage unit is electrically connected with the first motor, the second motor, the front axle motor, the PTO motor and the generator respectively.

2. The electric drive tractor CVT powertrain of a rear-mounted electric PTO configuration of claim 1, further comprising: the energy storage unit is electrically connected with the high-voltage distribution box and is also electrically connected with the first motor, the second motor, the front axle motor, the PTO motor and the generator respectively through the high-voltage distribution box.

3. The electric drive tractor CVT powertrain of a rear-mounted electric PTO configuration of claim 2, further comprising: and the charge and discharge interface is electrically connected with the high-voltage distribution box.

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