CN116278695B - Electric drive bridge system and electric truck - Google Patents
Electric drive bridge system and electric truck Download PDFInfo
- Publication number
- CN116278695B CN116278695B CN202310601962.1A CN202310601962A CN116278695B CN 116278695 B CN116278695 B CN 116278695B CN 202310601962 A CN202310601962 A CN 202310601962A CN 116278695 B CN116278695 B CN 116278695B
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- motor
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- axle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
- B60K17/165—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing provided between independent half axles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
- B60K17/356—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having fluid or electric motor, for driving one or more wheels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
Abstract
The invention relates to an electric drive axle system and an electric truck. The electric drive bridge system is provided with a first electric drive bridge and a second electric drive bridge, wherein the first electric drive bridge is provided with a first motor, a first gear-free speed reducer connected with the first motor, a first axle connected with the first gear-free speed reducer, a second motor, a second gear-free speed reducer connected with the second motor and a second axle connected with the second gear-free speed reducer; the second electric drive axle is provided with a third motor, a gear shifting speed changer and a differential mechanism assembly, wherein the third motor is connected with an input shaft of the gear shifting speed changer, an output shaft of the gear shifting speed changer is connected with the differential mechanism assembly, and the differential mechanism assembly is connected with a third axle and a fourth axle. An electric truck has an electric drive axle system according to the present invention.
Description
Technical Field
The invention relates to an electric drive axle system and an electric truck.
Background
A variety of multi-axis drive heavy trucks are currently known in china, such as 6-wheel-4 drive, 8-wheel-4 drive, etc. Wherein, no matter the oil car, or the electric drive car, two rear axle actuating system speed ratio is the same. Especially, the electric multi-shaft driving truck has the same structure as two driving axles, each driving axle adopts a 2-3 gear shifting mechanism, and in the using process of the vehicle, the gear shifting synchronism of two axles is poor or the synchronism difficulty is high, so that the tire grinding or gear shifting mechanism tooth beating is easy to cause, and the gear shifting strategy is complex.
In addition, it is also known that some electric trucks abroad use 6-wheel-drive 4-drive, and the total weight is about 37 tons. In the control strategy, a single motor on one drive axle is used as a driver under a cruising working condition, and a double motor on the other drive axle is used as a driver under a power working condition, so that different driving modes in different scenes are realized. However, because the two electric drive bridges are not provided with the gear shifting mechanism, a single motor cannot be used for applying power working conditions, and under the working conditions of high speed and gradient, the single motor is used as a driver for cruising working conditions, so that the working point of the motor easily exceeds a high-efficiency area, the energy consumption is obviously higher when the vehicle runs on a road with frequent slope, and the power of the motor is required to be larger.
Therefore, in view of various road types in China and numerous working conditions, the electric drive bridge system is required to have wide adaptability, and meanwhile, energy conservation is required to reduce transportation cost.
In addition, electric trucks are related to heavy, medium and light trucks and various working vehicles (such as a mixer truck, a dump truck and the like), and electric drive axles of various vehicle types often need to be designed separately, and if the electric drive axles can be designed based on one electric drive axle system frame, the design cost and the manufacturing cost can be greatly reduced if different vehicle types only need to be modified or expanded on the basis. Therefore, an electric drive bridge system or an electric drive bridge structure which can be widely applied to various vehicle types as much as possible is also the current effort direction.
Disclosure of Invention
Based on the above mentioned prior art, the technical problem to be solved by the present invention is to provide an electric drive bridge system, which has wide adaptability to various road conditions and working conditions, and the motor can be kept in a high-efficiency area as much as possible during running, so that more energy is saved, and meanwhile, the electric drive bridge system can be suitable for most electric truck types. The object of the invention is also to provide an electric truck with an electric drive axle system according to the invention.
The electric drive bridge system comprises a first electric drive bridge and a second electric drive bridge, wherein the first electric drive bridge is provided with a first motor, a first gear-free speed reducer connected with the first motor, a first axle connected with the first gear-free speed reducer, a second motor, a second gear-free speed reducer connected with the second motor and a second axle connected with the second gear-free speed reducer; the second electric drive axle is provided with a third motor, a gear shifting speed changer and a differential mechanism assembly, wherein the third motor is connected with an input shaft of the gear shifting speed changer, an output shaft of the gear shifting speed changer is connected with the differential mechanism assembly, and the differential mechanism assembly is connected with a third axle and a fourth axle.
The core concept of the invention is an organic combination of two electric drive bridges, more precisely an organic combination of a double-motor fixed transmission ratio electric drive bridge and a single-motor shiftable electric drive bridge, by which the invention can be widely applied to various road conditions and working conditions, and the application is not only applicable but also ensures that the invention can be kept in a high-efficiency area for most of the time. In the context of the present invention, a high efficiency region of the motor means a motor efficiency in the range of 90% to 97%. In addition, through the organic combination of the two electric drive bridges, the motor controller and the gear shift controller are more reasonable in design and can be well integrated. The electric drive bridge system based on the invention can be suitable for various operation vehicles, not only can be suitable for transportation trucks, but also can be suitable for mixer trucks, dumpers and the like. Therefore, the electric drive bridge system creates an electric drive bridge structure or an electric drive bridge platform, provides a plurality of feasible schemes on the basis, and solves the problem that the dynamic property and the economical property of the electric drive system of the multi-shaft electric vehicle cannot be compatible at the same time.
In a preferred embodiment of the invention, the gear change transmission is designed as a two-speed transmission with a high gear and a low gear, wherein the gear ratio of the two-speed transmission is selected between 7:1 and 55:1. This may enable the second electrically driven bridge to be selected between the economy cruise mode and the power mode depending on power demand and/or load.
In a preferred embodiment of the present invention, the first axle, the second axle, the third axle and the fourth axle are each connected to the respective wheels at a constant speed. This means that no hub reduction (such as a planetary gear reduction) is provided between the wheels and the axles, which on the one hand reduces the overall weight of the electrically driven axle and on the other hand also reduces the number of parts and complexity.
In a preferred embodiment of the invention, the first motor, the second motor and the third motor are selected to be motors of the same specification or of different specifications. By this design, it is first of all shown that the compatibility of the electrically driven bridge system according to the invention is good, since no motor needs to be selected deliberately for different operating conditions. In addition, the motor control complexity can be reduced, and the logistic cost and the maintenance cost are facilitated, especially when three motors are of the same specification.
In a preferred embodiment of the invention, the power ratings of the first motor, the second motor and the third motor are each selected between 80 and 200 kw. In this case, not only most of the working conditions can be satisfied, but also energy can be saved as much as possible for most of the road conditions. Particularly for transporting electric trucks, the transportation costs can be significantly reduced compared to oil trucks.
In a preferred embodiment of the invention, the electric drive bridge system has an electric drive bridge controller configured to enable switching of a single motor drive mode (referred to herein as the third motor), a dual motor drive mode (referred to herein as the first motor and the second motor), and a three motor drive mode, depending on the scene requirements. Through the above switching of the various driving modes, various working conditions and road conditions can be greatly adapted, namely, the scenes are described herein, such as the scenes relate to vehicle starting, vehicle cruising, vehicle climbing and the like.
In a preferred embodiment of the invention, the electric drive bridge system has an electric drive bridge controller configured to control the target torque of the first motor, the second motor and/or the third motor between 200 and 300 nm and the target rotational speed between 4000 and 6000 rpm. The applicant has proved through experiments that such a control strategy is very advantageous, by controlling the torque and the rotational speed of the motor, the motor can be kept as high as possible in a high-efficiency zone, whereby the energy consumption can be reduced to a great extent. Furthermore, such a control strategy is particularly advantageous when used in connection with an electrically driven bridge system according to the invention, since the electrically driven bridge system according to the invention provides the premise that the electric machine can always be operated in a high-efficiency zone under various operating conditions, that is to say can be kept in the high-efficiency zone in most cases, whereby the energy consumption is reduced.
Another aspect of the invention also relates to an electric truck having an electric drive axle system according to the invention. The electric truck according to the invention has at least two axles, preferably three axles. Advantageously, the electric drive axle system according to the invention is a center axle and a rear axle. In the electric truck according to the invention, the individual axles are designed to carry a load of 7 to 16 tons, and the total vehicle weight can be up to 60 tons.
In general, the electric drive bridge system solves the problem of poor applicability of electric commercial vehicle scenes, so that the electric drive bridge can be widely applied to electric trucks, particularly medium-heavy electric trucks, and solves the problem that the power performance and the economy of the electric drive system of the multi-axle vehicle cannot be compatible at the same time. Through the preferred embodiments of the invention, the electric drive bridge system or the electric truck according to the invention can further reduce energy consumption and operation cost, thereby generating greater advantages relative to an oil truck and improving the future market penetration of the electric truck.
Drawings
The above features and advantages of the present invention and the manner in which the same are accomplished are described in detail below in connection with the specific embodiments and with reference to the accompanying drawings, but the present invention is not limited to the features of the specific embodiments. In the drawings:
fig. 1 shows an electrically driven bridge system according to the invention.
Detailed Description
The electric drive axle system according to the invention shown in fig. 1 has a first electric drive axle with a first electric motor 1, a first gear-free reduction gear 2 connected to the first electric motor 1, a first axle 10 connected to the first gear-free reduction gear 2, a second electric motor 3, a second gear-free reduction gear 4 connected to the second electric motor 3, and a second axle 11 connected to the second gear-free reduction gear 4, wherein the first axle and the second axle are each connected to a respective wheel at a constant speed; the second electrically driven axle has a third electric machine 5, a second gear transmission 6, a differential assembly 7, a third axle 8 and a fourth axle 9 connected to the differential assembly 7, wherein the third electric machine is connected to an input shaft of the second gear transmission, an output shaft of the second gear transmission is connected to the differential assembly, the differential assembly is connected to the third axle and the fourth axle, and the third axle and the fourth axle are connected to the respective wheels at equal speeds. In the embodiment shown in fig. 1, the axle is therefore connected to the wheels at a constant speed, which means that no hub reduction is provided between the wheels and the axle, so-called hub reduction being typically a planetary gear reduction.
The electric drive bridge system has wide road condition adaptability and can adapt to most road conditions.
In normal cruising conditions, the road remains substantially flat, when the first and second motors of the first electrically driven bridge are operated, and the efficiency of the first and second motors can be easily maintained in the high efficiency zone. In addition, the third electric machine of the second electrically driven bridge can also be operated in cruising mode when the high gear is engaged, depending on the power demand and/or load.
In a small grade on an electric truck, such as in a road condition with a grade of 1 to 2 degrees, only the third electric machine may be used, wherein the second speed transmission is engaged in a high gear, at which time sufficient power may be provided. Meanwhile, the first motor and the second motor may not operate. Energy can thereby be saved and the efficiency of the third motor can be maintained in the high efficiency zone.
In larger grades on electric trucks, such as road conditions with grades of 2 to 5 degrees, only the third electric machine may be used, with the second gear transmission engaged in a low gear. At the same time, the first motor and the second motor do not operate. Energy can thereby be saved and the efficiency of the third motor can still be maintained in the high efficiency zone.
When the gradient is greater than 5 degrees, can use first motor, second motor and third motor simultaneously, wherein the gear of second gear derailleur is hung and is selected according to the circumstances such as actual load to satisfy required power. Typically this road condition is not a normal road condition, and a short increase in energy consumption is acceptable.
Thus, for the entire stroke, the three motors remain in the high efficiency zone most of the time, and are therefore very energy efficient as a whole.
For the present embodiment, the load of the first or second electric drive bridge may be 7 to 16 tons, and the rated power of the single motor may be 80 to 200 kw, so that the electric drive bridge architecture can meet most truck types and various work vehicles.
It should be noted that, in the present invention, ordinal numbers such as "first" and "second" are merely used to distinguish one entity from another entity, and do not require or imply a specific order between the entities, nor do ordinal numbers correspond to the number.
It will be appreciated by persons skilled in the art that the above-described embodiments are merely examples and that various modifications, combinations, partial combinations and substitutions may be made to the embodiments of the invention according to design requirements and other factors, provided that they fall within the scope of the appended claims or their equivalents, i.e. within the scope of the claims to be protected.
Claims (9)
1. An electric drive bridge system is provided with a first electric drive bridge and a second electric drive bridge, and is characterized in that the first electric drive bridge is provided with a first motor, a first gear-free speed reducer connected with the first motor, a first axle connected with the first gear-free speed reducer, a second motor, a second gear-free speed reducer connected with the second motor and a second axle connected with the second gear-free speed reducer; the second electric drive bridge is provided with a third motor, a gear shifting transmission and a differential mechanism assembly, wherein the third motor is connected with an input shaft of the gear shifting transmission, an output shaft of the gear shifting transmission is connected with the differential mechanism assembly, the differential mechanism assembly is connected with a third axle and a fourth axle, the first electric drive bridge is a fixed transmission ratio electric drive bridge, the electric drive bridge system is provided with an electric drive bridge controller, the electric drive bridge controller is configured to be capable of switching a single motor drive mode, a double motor drive mode and a three motor drive mode according to scene requirements, the single motor drive mode refers to a single motor drive mode of the third motor, and the double motor drive mode refers to a double motor drive mode of the first motor and the second motor.
2. The electrically driven bridge system according to claim 1, characterized in that the gear change transmission is designed as a two-speed transmission with a high-speed and a low-speed gear, wherein the two-speed transmission gear ratio is selected between 13:1 and 55:1.
3. The electric drive axle system of claim 1, wherein the first axle, the second axle, the third axle, and the fourth axle are each coupled to a respective wheel at a constant speed.
4. The electric drive bridge system of claim 1, wherein the first motor, the second motor, and the third motor are selected to be the same gauge motors.
5. The electric drive bridge system of claim 1, wherein the first motor, the second motor, and the third motor each have a power rating selected between 80 and 200 kw.
6. The electric drive bridge system of claim 1, wherein the electric drive bridge system has an electric drive bridge controller configured to control the target torque of the first motor, the second motor, and/or the third motor to be between 200 and 300 nm, and the target rotational speed to be between 4000 and 6000 rpm.
7. An electric truck having an electric drive axle system according to any one of claims 1 to 6.
8. The electric truck of claim 7, wherein the electric truck has at least two axles.
9. The electric truck of claim 7, wherein the load of the individual axles is designed to be 7 to 16 tons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310601962.1A CN116278695B (en) | 2023-05-26 | 2023-05-26 | Electric drive bridge system and electric truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310601962.1A CN116278695B (en) | 2023-05-26 | 2023-05-26 | Electric drive bridge system and electric truck |
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| Publication Number | Publication Date |
|---|---|
| CN116278695A CN116278695A (en) | 2023-06-23 |
| CN116278695B true CN116278695B (en) | 2023-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310601962.1A Active CN116278695B (en) | 2023-05-26 | 2023-05-26 | Electric drive bridge system and electric truck |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116587829B (en) * | 2023-07-17 | 2023-09-12 | 江苏速豹动力科技有限公司 | Battery pack locking device and electric truck |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103204059A (en) * | 2012-01-16 | 2013-07-17 | 同济大学 | Wheel-rim electric driving system of electric car |
| CN110645327A (en) * | 2019-09-24 | 2020-01-03 | 奇瑞汽车股份有限公司 | Stepless speed change drive axle |
| CN217048271U (en) * | 2022-03-23 | 2022-07-26 | 索特传动设备有限公司 | Electric drive axle and vehicle |
| CN115416473A (en) * | 2022-08-09 | 2022-12-02 | 中联恒通机械有限公司 | Multi-shaft driving hybrid power system and vehicle |
| CN115571131A (en) * | 2022-10-09 | 2023-01-06 | 索特传动设备有限公司 | Anti-slip method and device for vehicle and vehicle |
-
2023
- 2023-05-26 CN CN202310601962.1A patent/CN116278695B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103204059A (en) * | 2012-01-16 | 2013-07-17 | 同济大学 | Wheel-rim electric driving system of electric car |
| CN110645327A (en) * | 2019-09-24 | 2020-01-03 | 奇瑞汽车股份有限公司 | Stepless speed change drive axle |
| CN217048271U (en) * | 2022-03-23 | 2022-07-26 | 索特传动设备有限公司 | Electric drive axle and vehicle |
| CN115416473A (en) * | 2022-08-09 | 2022-12-02 | 中联恒通机械有限公司 | Multi-shaft driving hybrid power system and vehicle |
| CN115571131A (en) * | 2022-10-09 | 2023-01-06 | 索特传动设备有限公司 | Anti-slip method and device for vehicle and vehicle |
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| Publication number | Publication date |
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| CN116278695A (en) | 2023-06-23 |
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