CN106915232B - Power driving system and vehicle with same - Google Patents
Power driving system and vehicle with same Download PDFInfo
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- CN106915232B CN106915232B CN201510993040.5A CN201510993040A CN106915232B CN 106915232 B CN106915232 B CN 106915232B CN 201510993040 A CN201510993040 A CN 201510993040A CN 106915232 B CN106915232 B CN 106915232B
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- planetary gear
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- motor generator
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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
- B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
- B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Hybrid Electric Vehicles (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Retarders (AREA)
Abstract
The invention discloses a power driving system and a vehicle. A power drive system comprising: first and second motor generators; the power transmission device comprises a first power output shaft, a second power output shaft, a plurality of groups of first planetary gear mechanisms and a plurality of groups of second planetary gear mechanisms, wherein the plurality of groups of first planetary gear mechanisms are arranged between a first motor generator and the first power output shaft in series; first and second braking means for braking the first and second common ring gears, respectively; a power engagement means arranged for engaging the first power take-off shaft with the second power take-off shaft. The power driving system reduces the number of parts at least to a certain extent, so that the structure of the power driving system is simplified at least to a certain extent and the volume of the power driving system is relatively smaller.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a power driving system and a vehicle with the same.
Background
The power output from the power source of the vehicle, such as an engine, a motor, etc., generally needs to be distributed to wheels on both sides through a differential, which can perform a differential function, and the conventional mechanical type differential is mainly of a bevel gear type and a spur gear type, which have been widely applied to existing vehicles.
Another driving apparatus for a vehicle having a differential function, which is known to the inventor, employs two planetary gear type structures and two sets of motors, while a one-way clutch and a brake device are provided, and a ring gear is braked by the one-way clutch in some operating conditions and by the brake device in other operating conditions. Although such a vehicle drive apparatus can simplify the control strategy to some extent, it increases the cost and makes the entire power system bulky since two mechanical elements, i.e., a brake device and a one-way clutch, need to be provided. Moreover, two mechanical elements are required, which increases the difficulty of arrangement for the originally extremely compact arrangement space and also increases the damage risk in long-term use. In addition, the differential has no limited slip function, namely, only one of the two motors of the differential can output power outwards after the vehicle slips, so that the trafficability of the vehicle is greatly reduced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art.
The invention provides a power driving system, which reduces the number of parts at least to a certain extent, so that the structure of the power driving system is simplified at least to a certain extent and the volume of the power driving system is relatively smaller.
The invention also provides a vehicle which is provided with the power driving system.
A power drive system according to an embodiment of the present invention includes: a first motor generator and a second motor generator; a first power output shaft and a second power output shaft, and a plurality of sets of first planetary gear mechanisms and a plurality of sets of second planetary gear mechanisms, the plurality of sets of first planetary gear mechanisms being disposed in series between the first motor generator and the first power output shaft and being capable of outputting power from the first motor generator to the first power output shaft through a speed change action, the plurality of sets of second planetary gear mechanisms being disposed in series between the second motor generator and the second power output shaft and being capable of outputting power from the second motor generator to the second power output shaft through a speed change action, wherein the plurality of sets of first planetary gear mechanisms share a same first common ring gear, the plurality of sets of second planetary gear mechanisms share a same second common ring gear, the first power output shaft being adapted to be connected to one wheel of a pair of wheels of a vehicle, the second power output shaft is suitable for being connected with the other wheel of the pair of wheels, and the pair of wheels is a pair of front wheels or a pair of rear wheels; a first brake device provided for braking the first common ring gear, and a second brake device provided for braking the second common ring gear; and power engagement means arranged to engage the first power take-off shaft with the second power take-off shaft.
The power driving system provided by the embodiment of the invention reduces the number of parts at least to a certain extent, so that the structure of the power driving system is simplified at least to a certain extent and the volume is relatively smaller. Furthermore, the power drive system according to the embodiment of the invention also has a differential speed limited slip function.
According to some embodiments of the present invention, the sun gear of the first planetary gear mechanism of the plurality of first planetary gear mechanisms is linked with the first motor generator, and the carrier of the last planetary gear mechanism of the plurality of first planetary gear mechanisms is connected with the first power output shaft; the sun gear of a first group of second planetary gear mechanisms in the multiple groups of second planetary gear mechanisms is linked with the second motor generator, and the planet carrier of a last group of second planetary gear mechanisms in the multiple groups of second planetary gear mechanisms is connected with the second power output shaft.
According to some embodiments of the invention, the carrier of the previous set of first planetary gear mechanisms is connected with the sun gear of the next set of first planetary gear mechanisms; in the multiple groups of second planetary gear mechanisms, the planet carrier of the previous group of second planetary gear mechanisms is connected with the sun gear of the next group of second planetary gear mechanisms.
According to some embodiments of the invention, the plurality of sets of first planetary gear mechanisms and the plurality of sets of second planetary gear mechanisms are each two sets.
According to some embodiments of the invention, the power engaging device comprises a clutch.
According to some embodiments of the invention, the clutch comprises: a first portion and a second portion engageable with and disengageable from each other, the first portion being connected to the first power take-off shaft, the second portion being connected to the second power take-off shaft.
According to some embodiments of the invention, the power engagement device comprises a synchronizer.
According to some embodiments of the invention, the synchronizer is provided on one of the first power output shaft and the second power output shaft and is adapted to engage the other.
According to some embodiments of the invention, the first motor generator is coaxially fitted over the first power output shaft, and the second motor generator is coaxially fitted over the second power output shaft.
According to some embodiments of the present invention, the plurality of sets of first planetary gear mechanisms and the plurality of sets of second planetary gear mechanisms are symmetrically arranged with respect to the power engagement device, the first motor generator and the second motor generator are symmetrically arranged with respect to the power engagement device, and the first motor generator and the second motor generator are located on opposite outer sides of the plurality of sets of first planetary gear mechanisms and the plurality of sets of second planetary gear mechanisms, respectively.
According to another aspect of the invention, a vehicle includes the power drive system described in the above embodiments.
Drawings
FIG. 1 is a schematic illustration of a power drive system according to one embodiment of the present invention;
FIG. 2 is an enlarged fragmentary view of the power drive system shown in FIG. 1;
FIG. 3 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;
FIG. 4 is a schematic illustration of a vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
A power drive system 100a according to an embodiment of the present invention, the power drive system 100a being adapted for use in a vehicle 1000a, such as a hybrid vehicle, is described below with reference to the accompanying drawings, and the power drive system 100a being capable of serving as a power source for the vehicle 1000a and providing power required for normal running of the vehicle 1000 a.
The power drive system 100a is described in detail below in connection with the embodiments of fig. 1-3.
The power drive system 100a according to the embodiment of the invention may include the first and second motor generators 31a and 32a, the first and second power output shafts 43a and 44a, the sets of the first planetary gear mechanism 1a and the sets of the second planetary gear mechanism 2a, and the first brake device 63a, the second brake device 64a, and the power engagement device 65 a.
As shown in fig. 1 to 3, a plurality of sets of first planetary gear mechanisms 1a (a 1, a2 in fig. 1 to 3) are arranged in series between the first motor generator 31a and the first power output shaft 43a, the plurality of sets of first planetary gear mechanisms 1a are arranged to be able to output the power from the first motor generator 31a to the first power output shaft 43a through a speed change action, and since the plurality of sets of first planetary gear mechanisms 1a are arranged in series, the plurality of sets of first planetary gear mechanisms 1a are able to sequentially perform a speed change action on the power during the output of the power of the first motor generator 31a to the first power output shaft 43a, and thus a multi-stage speed change function is achieved. For example, each of the first planetary gear mechanisms performs a speed reduction and torque increase action, and therefore the plurality of sets of first planetary gear mechanisms 1a form a multi-stage speed reduction effect, thereby increasing the output torque of the first motor generator 31 a.
Similarly, a plurality of sets of second planetary gear mechanisms 2a are arranged in series between the second motor generator 32a and the second power output shaft 44a, the plurality of sets of second planetary gear mechanisms 2a are arranged to be able to output the power from the second motor generator 32a to the second power output shaft 44a through a speed change action, and since the plurality of sets of second planetary gear mechanisms 2a are arranged in series, the plurality of sets of second planetary gear mechanisms 2a are able to sequentially perform a speed change action on the power during the output of the power of the second motor generator 32a to the second power output shaft 44a, and thus a multi-step speed change function is performed. For example, each of the second planetary gear mechanisms functions to reduce the speed and increase the torque, and therefore the plurality of sets of second planetary gear mechanisms 2a form a multi-stage speed reduction effect, thereby increasing the output torque of the second motor generator 32 a.
The plural sets of first planetary gear mechanisms 1a may be coaxially arranged, the plural sets of second planetary gear mechanisms 2a may also be coaxially arranged, and the central axes of the plural sets of first planetary gear mechanisms 1a and the plural sets of second planetary gear mechanisms 2a may be coincident.
The first power take-off shaft 43a may be connected to one wheel 41a of a pair of wheels of the vehicle, and the second power take-off shaft 44a may be connected to the other wheel 42a of the pair of wheels, which may be a pair of front wheels, but may of course be a pair of rear wheels.
Referring to fig. 1 and 2, each of the first planetary gear mechanism 1a and the second planetary gear mechanism 2a may be a single row planetary gear mechanism, and the first planetary gear mechanism 1a may include a sun gear, a planet carrier, and a ring gear (a plurality of sets of the first planetary gear mechanisms 1a share the ring gear, i.e., the first shared ring gear 13 a).
The planet wheel is installed on the planet carrier and is arranged between the sun gear and the gear ring, and the planet wheel is respectively meshed with the sun gear and the gear ring. The planet wheels can be mounted on the planet carrier through a planet wheel shaft, the planet wheels can be a plurality of planet wheels and are uniformly distributed along the circumferential direction of the sun wheel at intervals, for example, the planet wheels can be three planet wheels and are uniformly distributed on the outer side of the sun wheel in consideration of the stability of power transmission and the manufacturing cost, and the interval between every two adjacent planet wheels is about 120 degrees.
The engagement mode of the planet wheel and the sun wheel is external engagement. The engagement between the planetary gear and the gear ring is inner engagement, that is, teeth are formed on the inner circumferential surface of the gear ring, and the planetary gear is engaged with the teeth on the inner circumferential surface of the gear ring. The planet wheel can rotate around the axis of the planet wheel shaft and can also revolve around the sun wheel.
Similarly, the second planetary gear mechanism 2a may also include a sun gear, planet gears, a planet carrier, and a ring gear (which is shared by multiple sets of second planetary gear mechanisms 2a, i.e., the second shared ring gear 23 a). Further, the relative positional relationship, the connection relationship, the action relationship, and the like between the respective members may be made in accordance with the first planetary gear mechanism 1a, and therefore, will not be described in detail here. Further, the connection relationship between the plurality of sets of first planetary gear mechanisms 1a, the plurality of sets of second planetary gear mechanisms 2a, and the like will be described in detail below with reference to specific embodiments.
Referring to fig. 1 to 2, the plurality of sets of first planetary gear mechanisms 1a share the same first common ring gear 13a, and the plurality of sets of second planetary gear mechanisms 2a share the same second common ring gear 23 a. Therefore, the power driving system 100a has a more compact structure, a smaller volume and a more convenient arrangement.
The first brake device 63a is provided for braking the first common ring gear 13a, and the second brake device 64a is provided for braking the second common ring gear 23 a. Alternatively, the first and second braking devices 63a and 64a may be brakes, but are not limited thereto.
Referring to fig. 1-2, the power coupling device 65a is configured to couple the first power output shaft 43a and the second power output shaft 44a, so that the first power output shaft 43a and the second power output shaft 44a form a rigid connection therebetween, and the first power output shaft 43a and the second power output shaft 44a can rotate in the same direction and at the same speed. That is, when the power engagement device 65a is in the engaged state, the first power output shaft 43a and the second power output shaft 44a are kept in the synchronous operation state, and when the power engagement device 65a is in the disengaged state, the first power output shaft 43a and the second power output shaft 44a can perform differential rotation, that is, the first power output shaft 43a and the second power output shaft 44a can rotate at different rotational speeds (may rotate at the same rotational speed, of course).
Here, it should be noted that the power coupling device 65a is used for coupling the first power output shaft 43a and the second power output shaft 44a, and it should be understood in a broad sense, for example, the power coupling device 65a may directly couple or decouple the first power output shaft 43a and the second power output shaft 44a, and of course, the power coupling device 65a may indirectly couple or decouple the first power output shaft 43a and the second power output shaft 44a by coupling or decoupling other two components, such as the carrier a23 and the carrier B23.
In a vehicle having the power drive system 100a according to the embodiment of the invention, for example, when the vehicle 1000a travels on a flat road surface and travels in a straight line, the first brake device 63a and the second brake device 64a can brake the first common ring gear 13a and the second common ring gear 23a, respectively, and the first motor generator 31a and the second motor generator 32a can output power at the same rotational speed, so that the rotational speeds obtained for the respective wheels are theoretically equal by the decelerating action of the respective sets of planetary gear mechanisms, thereby ensuring that the vehicle 1000a can travel smoothly in a straight line.
For another example, when the vehicle 1000a runs on an uneven road or turns, the first brake device 63a and the second brake device 64a can brake the first common gear ring 13a and the second common gear ring 23a, respectively, and the rotational speeds of the wheels on both sides theoretically have a rotational speed difference, taking a left turn as an example, the turning radius of the left wheel is smaller and the turning radius of the right wheel is larger, in order to ensure that the wheels roll with the ground, the rotational speed of the left wheel is smaller than the rotational speed of the right wheel, and the output rotational speed of the first motor generator 31a can be smaller than the output rotational speed of the second motor generator 32a, and the specific rotational speed difference can be indirectly calculated by the steering angle of the steering wheel, such as the driver rotates the steering wheel counterclockwise (turns left) by a certain angle, and the controller of the vehicle 1000a can calculate the turning radius of the vehicle 1000a based on the steering angle, after the turning radius of the vehicle 1000a is determined, the relative rotation speed difference of the wheels on the two sides is also determined, and at this time, the controller can control the first motor generator 31a and the second motor generator 32a to output power outwards at matched rotation speeds respectively, so that the rotation speed difference between the first motor generator 31a and the second motor generator 32a can be matched with the rotation speed difference required by the wheels, and thus after the deceleration action of the two sets of planetary gear mechanisms, the two wheels can obtain expected rotation speeds, and pure rolling turning running is realized.
The above description has been given by taking the first motor generator 31a and the second motor generator 32a as the motors, but it is needless to say that the first motor generator 31a and the second motor generator 32a may operate as generators. At this time, similarly, the first brake device 63a and the second brake device 64a can brake the first common ring gear 13a and the second common ring gear 23a, respectively, and the first motor generator 31a and the second motor generator 32a can be operated as generators, thereby recovering braking energy. That is, when the first motor generator 31a and the second motor generator 32a output power as motors or recover energy as generators to generate power, the first brake device 63a and the second brake device 64a are both in a braking state of braking the corresponding common ring gear, respectively, and the power engagement device 65a is in a disengaged state.
It will of course be appreciated that the sets of first planetary gear mechanisms 1a and the sets of second planetary gear mechanisms 2a described above may employ the same transmission ratio, that is, the two sets of planetary gear mechanisms may employ the same transmission ratio with the sun gear as the power input and the planet carrier as the power output. For example, the number of teeth of the sun gear a11 and the sun gear B11, the number of teeth of the planet gear a12 and the planet gear B12, the number of teeth of the sun gear a21 and the sun gear B21, the number of teeth of the planet gear a22 and the planet gear B22, and the number of teeth of the first common ring gear 13a and the second common ring gear 23a may be respectively the same.
In particular, when the vehicle 1000a is traveling under poor road conditions, such as when the vehicle 1000a is traveling on a relatively muddy or soft gravel road or sand, the vehicle 1000a may be caught in the soil to cause idling, that is, the vehicle 1000a slips (the phenomenon and the cause of the slip are well known to those skilled in the art).
For the traditional differential with the self-locking function, after the wheel slips, only the differential needs to be controlled to be self-locked, so that the escaping capability of the vehicle 1000a can be improved at least to a certain extent.
Since the power driving system 100a according to the embodiment of the present invention has a differential function, but has a structure that is greatly different from that of a conventional differential, a conventional differential self-locking structure cannot be utilized. In order to improve the trafficability of the vehicle 1000a and improve the adaptability of the vehicle 1000a to poor road conditions, the power driving system 100a according to some embodiments of the present invention may further realize a self-locking function on the premise of realizing a differential function.
According to some embodiments of the present invention, for example, as shown in fig. 1 to fig. 2, when one-side wheel slip occurs in the vehicle, the power engagement device 65a engages the first power output shaft 43a with the second power output shaft 44a, and the first brake device 63a and the second brake device 64a brake the first common ring gear 13a and the second common ring gear 23a, respectively, whereby the first motor generator 31a and the second motor generator 32a can output the generated power from the non-slipping one-side wheel, improving the wheel slip phenomenon, and improving the vehicle's passing ability.
In summary, according to the power drive system 100a of the embodiment of the present invention, the braking action of the first braking device 63a and the second braking device 64a can realize the pure electric mode or the braking energy recovery mode of the first motor generator 31a and the second motor generator 32a, and the output rotation speeds of the first motor generator 31a and the second motor generator 32a can be controlled independently, so that the wheels on both sides can obtain different torques, and the differential function can be realized. In addition, the power driving system 100a according to the embodiment of the invention has the advantages of fewer parts, compact and simple structure, small occupied volume and more convenient arrangement.
In particular, the power drive system 100a according to the embodiment of the present invention may not be provided with the mechanical self-locking differential structure of the conventional power transmission system, but may perform the function of the conventional mechanical self-locking differential through the synchronization of the power engagement device 65a, thereby making the structure of the power drive system 100a according to the embodiment of the present invention more compact and lower in cost.
Referring to fig. 1 to 2, the series connection of the plurality of sets of first planetary gear mechanisms 1a and the plurality of sets of second planetary gear mechanisms 2a will be described in detail. It is understood that the plurality of sets of first planetary gear mechanisms 1a and the plurality of sets of second planetary gear mechanisms 2a may be connected in series in the same manner, which enables the power drive system 100a to have high symmetry, so that the center of gravity of the power drive system 100a is more biased to the middle region of the power drive system 100a or directly located in the middle region, thereby enabling to improve the stability of the vehicle and make the front-to-rear weight ratio more reasonable.
The sun gear a11 of the first planetary gear mechanism a1 of the first planetary gear mechanism 1a is linked with the first motor generator 31a, for example, the rotor of the first motor generator 31a may be coaxially connected with the sun gear a11,
it should be noted that the above-mentioned "linkage" may be understood as a linkage movement of a plurality of members (for example, two members), and in the case of linkage of two members, when one member moves, the other member also moves.
For example, in some embodiments of the present invention, a gear in communication with a shaft may be understood such that when the gear rotates, the shaft in communication therewith will also rotate, or when the shaft rotates, the gear in communication therewith will also rotate.
As another example, a shaft is coupled to a shaft is understood to mean that when one of the shafts rotates, the other shaft coupled thereto will also rotate.
As another example, gears may be understood to be geared with one gear so that when one gear rotates, the other gear that is geared with it will also rotate.
Of course, it should be understood that the two parts of the linkage may be relatively stationary with one part being relatively stationary, and the other part being relatively stationary therewith.
In the following description of the present invention, the term "linkage" is to be understood unless otherwise specified.
Further, the carrier a23 of the last set of the first planetary gear mechanism a2 of the plurality of sets of the first planetary gear mechanism 1a is connected to the first power output shaft 43a as a shaft.
Similarly, the sun gear B11 of the first-group second planetary gear mechanism B1 in the plurality of groups of second planetary gear mechanisms 2a is linked with the second motor generator 32a, e.g., the rotor of the second motor generator 32a may be coaxially connected with the sun gear B11. The carrier B23 of the last set of the second planetary gear mechanism B2 in the plurality of sets of second planetary gear mechanisms 2a is connected, e.g., coaxially connected, to the second power output shaft 44 a.
In a further embodiment, the carrier a13 of the preceding set of first planetary gear mechanism a1 in the multiple set of first planetary gear mechanism 1a is connected to the sun gear a21 of the following set of planetary gear mechanism a2 as a shaft, and the carrier B13 of the preceding set of second planetary gear mechanism B1 in the multiple set of second planetary gear mechanism 2a is connected to the sun gear B21 of the following set of second planetary gear mechanism B2 as a shaft.
For example, in the example of fig. 1-2, the first planetary gear mechanism 1a and the second planetary gear mechanism 2a are each two sets, and the carrier a13 of the first-group first planetary gear mechanism a1 is connected to the sun gear a21 of the last-group (i.e., second-group) first planetary gear mechanism a 2. Likewise, the carrier B13 of the first group second planetary gear mechanism B1 is connected with the sun gear B21 of the last group (i.e., second group) second planetary gear mechanism B2.
It should be noted that although the above embodiment shows a possible series connection of planetary gear mechanisms, this possible embodiment is only an illustrative example, and should not be construed as a limitation to the scope of the present invention or to imply that the present invention must adopt the above series connection. After reading the above description, those skilled in the art can modify and/or combine the above series connection mode to form a new scheme, which should belong to the equivalent of the above series connection mode and fall into the protection scope of the present invention.
Further, it should be noted that, in the description of the present invention regarding "motor generator", if not specifically stated, the motor generator may be understood as an electric machine having a function of a generator and a motor.
As an alternative embodiment, the power engagement device 65a may be a clutch, as shown in fig. 2. The clutch comprises a first part 651a and a second part 652a, which are engageable and disengageable with each other, the first part 651a being connected to the first power take-off shaft 43a, the second part 652a being connected to the second power take-off shaft 44 a.
Of course, the present invention is not limited thereto, and in other embodiments, as shown in fig. 3, the power engagement device 65a may be a synchronizer provided on one of the first power output shaft 43a and the second power output shaft 44a and for engaging the other.
As an alternative embodiment, the first motor generator 31a and the first sun gear 11a may be coaxially idly sleeved on the first power output shaft 43a, and the second motor generator 32a and the second sun gear 21a may be coaxially idly sleeved on the second power output shaft 44a, thereby making the structure of the power drive system 100a more compact.
In addition, the first motor generator 31a and the second motor generator 32a may be distributed symmetrically left and right, such as symmetrically arranged about the power engagement device 65a, the multiple sets of the first planetary gear mechanism 1a and the multiple sets of the second planetary gear mechanism 2a may also be distributed symmetrically left and right, such as symmetrically arranged about the power engagement device 65a, and the first motor generator 31a and the second motor generator 32a may be respectively located on opposite outer sides of the multiple sets of the first planetary gear mechanism 1a and the multiple sets of the second planetary gear mechanism 2a, that is, for example, taking fig. 1 as an example, the first motor generator 31a is located on the outer side, i.e., the left side, of the multiple sets of the first planetary gear mechanism 1a, and the second motor generator 32a is located on the outer side, i.e., the right side, of the.
As an alternative embodiment, the first power output shaft 43a and the second power output shaft 44a may be half shafts, e.g. the first power output shaft 43a may be a left half shaft and the second power output shaft 44a may be a right half shaft.
The configuration, connection, and typical operation of the power drive system 100a in the embodiment of fig. 1 will be described with reference to the accompanying drawings.
Referring to fig. 1, the power drive system 100a shown in this embodiment mainly includes two single-row planetary gear mechanisms a1, a2 on the left side, two single-row planetary gear mechanisms B1, B2 on the right side, two motor generators 31a, 32a, and brake devices 63a, 64a and a power engagement device 65a, and the like.
Specifically, two first planetary gear mechanisms a1, a2 on the left side are arranged in series and share the same first common ring gear 13a, sun gear a11 of first-group first planetary gear mechanism a1 is coaxially connected with first motor generator 31a, planet gear a12 of first-group first planetary gear mechanism a1 is mounted on planet carrier a13, planet gear a12 is respectively meshed with sun gear a11 and first common ring gear 13a, planet carrier a13 is coaxially connected with sun gear a21 of second-group first planetary gear mechanism a2, planet gear a22 of second-group first planetary gear mechanism a2 is mounted on planet carrier a23, planet gear a22 is respectively meshed with sun gear a21 and first common ring gear 13a, planet carrier a23 is coaxially connected with first power output shaft 43a, and first power output shaft 43a is connected with left-side wheel 41 a. The first motor generator 43a, the sun gear a11 and the sun gear a21 are coaxially fitted on the first power output shaft 43a, and the first power output shaft 43a may be a left axle shaft.
The two second planetary gear mechanisms 2a on the right side are arranged in series and share the same second shared ring gear 23a, the sun gear B11 of the first group of second planetary gear mechanisms B1 is coaxially connected with the second motor generator 32a, the planet gear B12 of the first group of second planetary gear mechanisms B1 is mounted on the planet carrier B13, the planet gear B12 is respectively meshed with the sun gear B11 and the second shared ring gear 23a, the planet carrier B13 is coaxially connected with the sun gear B21 of the second group of second planetary gear mechanisms B2, the planet gear B22 of the second group of second planetary gear mechanisms B2 is mounted on the planet carrier B23, the planet gear B22 is respectively meshed with the sun gear B21 and the second shared ring gear 23a, the planet carrier B23 is coaxially connected with the second power output shaft 44a, and the second power output shaft 44a is connected with the right-side wheel 42 a. The second motor generator 32a, the sun gear B11 and the sun gear B21 are coaxially fitted on the second power output shaft 44a, and the second power output shaft 44a may be a right axle shaft.
The first brake device 63a is used for braking the first common ring gear 13a, the second brake device 64a is used for braking the second common ring gear 23a, and the power engaging device 65a is provided between the sets of the first planetary gear mechanism 1a and the sets of the second planetary gear mechanism 2a and is used for selectively engaging the first power output shaft 43a and the second power output shaft 44 a.
Exemplary operating conditions of the power drive system 100a in the embodiment of FIG. 1 are described below.
Electric-only operating conditions (by means of the first and second motor- generators 31a, 32 a):
the first brake device 63a brakes the first common ring gear 13a and the second brake device 64a brakes the second common ring gear 23a, with the power engagement device 65a in the disengaged state. The first motor generator 31a and the second motor generator 32a may be operated as motors, respectively. Thus, the power generated by the first motor generator 31a is output to the left wheel 41a by the decelerating action of the two sets of first planetary gear mechanisms 1a, and the rotation speed of the first motor generator 31a changes in positive correlation with the rotation speed of the left wheel 41 a. The power generated by the second motor generator 32a is output to the right-hand wheel 42a by the deceleration action of the two sets of second planetary gear mechanisms 2a, and the rotation speed of the second motor generator 32a changes in positive correlation with the rotation speed of the right-hand wheel 42 a.
Since the first motor generator 31a and the second motor generator 32a are operated independently at this time, and they do not interfere with each other, the two motors can adaptively adjust the output rotation speed according to the torque required by the respective corresponding wheels, thereby implementing the differential function.
It is understood that in this operating condition, the first motor generator 31a and the second motor generator 32a may rotate clockwise or counterclockwise, thereby achieving electric-only forward or electric-only reverse.
And (3) a slipping working condition:
taking the left wheel 41a slipping as an example, the first brake device 63a brakes the first common ring gear 13a and the second brake device 64a brakes the second common ring gear 23a, the power engagement device 65a is engaged, and the power generated by the first motor generator 31a can be output to the second planetary gear mechanism on the right side by the engagement action of the power engagement device 65a, and can be coupled with the power generated by the second motor generator 32a at the carrier B23 to be output to the non-slipping wheel 42a on the right side.
Therefore, when the left wheel slips, the left first motor generator 31a can still output power from the wheel which does not slip on the right side, and the first motor generator 31a does not need to be reversed, so that the timeliness and the success rate of getting rid of the trouble are greatly improved.
Sliding in neutral gear:
the first brake device 63a, the second brake device 64a, and the power engagement device 65a are all in the disengaged state, and the first motor generator 31a and the second motor generator 32a are in the follow-up state.
Recovering braking energy:
the first brake device 63a brakes the first common ring gear 13a and the second brake device 64a brakes the second common ring gear 23a, the power coupling device 65a can be in the off state, and the braking energy is output to the corresponding motor generator through the respective power output shaft and the planetary gear mechanism, thereby driving the motor generator to generate electricity.
Briefly describing a vehicle 1000a according to an embodiment of the present invention, referring to fig. 4, the vehicle 1000a includes the power driving system 100a in the above embodiment, and the power driving system 100a may be used for forward driving or backward driving, but the present invention is not limited thereto. It should be appreciated that other configurations of the vehicle 1000a according to embodiments of the present invention, such as a braking system, a travel system, a steering system, etc., are known in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A power drive system, comprising:
a first motor generator and a second motor generator;
a first power output shaft and a second power output shaft, and a plurality of sets of a first planetary gear mechanism and a plurality of sets of a second planetary gear mechanism, the plurality of sets of the first planetary gear mechanism being coaxially arranged, the plurality of sets of the second planetary gear mechanism being coaxially arranged, the first motor generator being coaxially fitted over the first power output shaft, the second motor generator being coaxially fitted over the second power output shaft, the plurality of sets of the first planetary gear mechanism being serially disposed between the first motor generator and the first power output shaft and being capable of outputting power from the first motor generator to the first power output shaft through a speed change, the plurality of sets of the second planetary gear mechanism being serially disposed between the second motor generator and the second power output shaft and being capable of outputting power from the second motor generator to the second power output shaft through a speed change, wherein the plurality of sets of first planetary gear mechanisms share a same first common gear ring, the plurality of sets of second planetary gear mechanisms share a same second common gear ring, the first power take-off shaft is adapted to be connected to one of a pair of wheels of a vehicle, the second power take-off shaft is adapted to be connected to the other of the pair of wheels, the pair of wheels being either a front pair of wheels or a rear pair of wheels;
a first brake device provided for braking the first common ring gear, and a second brake device provided for braking the second common ring gear; and
a power coupling device arranged for directly or indirectly coupling the first power take-off shaft with the second power take-off shaft;
the plurality of sets of first planetary gear mechanisms and the plurality of sets of second planetary gear mechanisms are arranged symmetrically with respect to the power engagement device, the first motor generator and the second motor generator are arranged symmetrically with respect to the power engagement device, and the first motor generator and the second motor generator are located on opposite outer sides of the plurality of sets of first planetary gear mechanisms and the plurality of sets of second planetary gear mechanisms, respectively.
2. The power drive system according to claim 1, wherein a sun gear of a first planetary gear mechanism of the plurality of first planetary gear mechanisms is linked with the first motor generator, and a carrier of a last planetary gear mechanism of the plurality of first planetary gear mechanisms is connected with the first power output shaft;
the sun gear of a first group of second planetary gear mechanisms in the multiple groups of second planetary gear mechanisms is linked with the second motor generator, and the planet carrier of a last group of second planetary gear mechanisms in the multiple groups of second planetary gear mechanisms is connected with the second power output shaft.
3. The power drive system according to claim 2, wherein, in the plurality of first planetary gear mechanisms, the planet carrier of the previous first planetary gear mechanism is connected with the sun gear of the next first planetary gear mechanism;
in the multiple groups of second planetary gear mechanisms, the planet carrier of the previous group of second planetary gear mechanisms is connected with the sun gear of the next group of second planetary gear mechanisms.
4. The power drive system according to claim 3, wherein the plurality of sets of first planetary gear mechanisms and the plurality of sets of second planetary gear mechanisms are each two sets.
5. A power drive system according to claim 1 wherein the power engaging means comprises a clutch.
6. The power drive system according to claim 5, wherein the clutch comprises: a first portion and a second portion engageable with and disengageable from each other, the first portion being connected to the first power take-off shaft, the second portion being connected to the second power take-off shaft.
7. The power drive system of claim 1, wherein the power coupling device includes a synchronizer.
8. A power drive system according to claim 7, wherein the synchronizer is provided on one of the first and second power output shafts and is adapted to engage the other.
9. A vehicle characterized by comprising a power drive system according to any one of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510993040.5A CN106915232B (en) | 2015-12-25 | 2015-12-25 | Power driving system and vehicle with same |
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| CN201510993040.5A CN106915232B (en) | 2015-12-25 | 2015-12-25 | Power driving system and vehicle with same |
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| CN106915232A CN106915232A (en) | 2017-07-04 |
| CN106915232B true CN106915232B (en) | 2020-02-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018215934A1 (en) * | 2018-09-19 | 2020-03-19 | ZF Drivetech (Suzhou) Co.Ltd. | Final drive |
| CN112805170B (en) * | 2020-05-19 | 2022-04-29 | 华为技术有限公司 | Drive device, two-motor drive system, automobile, and method for controlling drive device |
| CN117227513A (en) * | 2023-11-06 | 2023-12-15 | 燕山大学 | Split pavement dual-mode coupling driving system, driving method and electric automobile |
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| CN203713556U (en) * | 2014-03-10 | 2014-07-16 | 合肥工业大学 | Motor for pure electric vehicle and transmission-integrated power assembly |
| CN103963638A (en) * | 2014-04-30 | 2014-08-06 | 北京理工大学 | Multi-axle vehicle hub motor dynamic coupling transmission system |
| CN104773063A (en) * | 2015-01-16 | 2015-07-15 | 比亚迪股份有限公司 | Speed changer, power transmission system and vehicle |
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| JP4055725B2 (en) * | 2004-03-17 | 2008-03-05 | 日産自動車株式会社 | Hybrid vehicle mode transition control device |
| US8632434B2 (en) * | 2009-03-31 | 2014-01-21 | Honda Motor Co., Ltd. | Drive device and vehicle with same |
| US9707834B2 (en) * | 2014-05-13 | 2017-07-18 | GM Global Technology Operations LLC | Vehicle transmission with common carrier planetary gear set |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203713556U (en) * | 2014-03-10 | 2014-07-16 | 合肥工业大学 | Motor for pure electric vehicle and transmission-integrated power assembly |
| CN103963638A (en) * | 2014-04-30 | 2014-08-06 | 北京理工大学 | Multi-axle vehicle hub motor dynamic coupling transmission system |
| CN104773063A (en) * | 2015-01-16 | 2015-07-15 | 比亚迪股份有限公司 | Speed changer, power transmission system and vehicle |
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