CN105459814A - Power transmission system for vehicle and vehicle with power transmission system - Google Patents

Abstract

The invention discloses a power transmission system for a vehicle and a vehicle with the power transmission system. The power transmission system includes: a differential, the power output end of each differential is respectively connected to the wheel on this side through a half shaft; the driven gear of the final drive, the driven gear of the final drive is arranged on the differential; A first motor-generator, each first motor-generator is coaxially set on the semi-shaft of the corresponding side; the motor power output shaft, the motor power output shaft is provided with the driving gear of the main reducer, two first The motor-generator cooperates with the power output shaft of the motor for transmission respectively. In the power transmission system of the present invention, two first motor-generators are arranged on both sides of the differential, so that the center of gravity of the power transmission system can be located in the middle of the axle as much as possible, and at the same time, the two first motor-generators can be mutually adjusted , so that the first motor generator can always be in a better working range, improving the transmission efficiency.

Description

Power transmission system for vehicle and vehicle with the power transmission system

technical field

The invention relates to the technical field of automobiles, in particular to a power transmission system for a vehicle and a vehicle with the power transmission system.

Background technique

Chinese invention patent application (application number: 201010252131.0) discloses an integrated motor drive system, which includes a motor, a reducer, a differential and two transmission shafts, and two transmission shafts are connected on both sides of the differential , the motor outputs power to the differential through the reducer. The power transmission system has a relatively compact structure and a high degree of integration.

However, the inventors have found that since there is one motor in the power transmission system and the power is output to the differential through the gear reducer, the lengths of the half shafts on the left and right sides of the differential are different, and the center of gravity of the power transmission system is located at the differential. On one side of the motor, the balance of the system is poor, and it is difficult for the motor to always maintain a good working range. Moreover, the one motor is the main power source. Once the motor fails, the entire power transmission system will lose power and cannot drive the vehicle to run normally.

Contents of the invention

The present invention aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent.

Therefore, an object of the present invention is to propose a power transmission system for a vehicle, which arranges a first motor-generator on both sides of the differential, so that the center of gravity of the power transmission system can be as close as possible. At the middle of the vehicle axle, the two first motor generators can be adjusted to each other at the same time, so that the first motor generators can be in a better working range and the transmission efficiency is improved.

Another object of the present invention is to propose a vehicle having the above power transmission system.

A power transmission system for a vehicle according to an embodiment of the present invention includes: a differential, and the differential has two differential power output ends, and each of the differential power output ends is connected to the side of the differential respectively. The wheels are connected through half shafts; the driven gear of the main reducer, the driven gear of the final reducer is arranged on the differential; two first motor generators, the two first motor generators are respectively located at the On both sides of the differential, each of the first motor-generators is coaxially provided on the semi-shaft on this side; the motor power output shaft is provided with a final reducer The driving gear, the driving gear of the final reducer meshes with the driven gear of the final reducer, and the two first motor generators cooperate with the power output shafts of the motors for transmission.

According to the power transmission system of the embodiment of the present invention, a first motor generator is arranged on both sides of the differential, so that the power transmission system has better symmetry, and its center of gravity can be located in the middle of the axle or near the middle of the axle At the same time, the two first motor-generators are linked through the motor power output shaft, so that the two first motor-generators can be adjusted to each other, ensuring that the motors can be in a better working range, and improving transmission efficiency. Moreover, even if one of the first motor-generators fails, the other first motor-generator can still work normally to meet the power required by the normal running of the vehicle and play the role of a backup power source.

In addition, according to an embodiment of another aspect of the present invention, a vehicle including the above power transmission system is also provided.

Description of drawings

FIG. 1 is a schematic diagram of a power transmission system according to an embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation or position indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore It should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

A power transmission system 100 according to an embodiment of the present invention will be described in detail below with reference to FIG. 1 . The power transmission system 100 can be applied in a vehicle, especially a hybrid vehicle with an engine and an electric motor.

The power transmission system 100 according to the embodiment of the present invention may include a differential 101 , a final drive driven gear 102 , two first motor generators 104 and a motor power output shaft 111 .

The function of the differential 101 is to enable the left and right drive wheels 110 to roll at different angular velocities when the vehicle is turning or driving on an uneven road surface, thereby ensuring pure rolling motion between the drive wheels on both sides and the ground.

The differential 101 may be a gear differential, more specifically, the differential 101 may be a symmetrical bevel gear differential. The symmetrical bevel gear differential 101 can include components such as a differential case, two half shaft gears, planetary gears, planetary gear shafts (cross shafts), and the planetary gear shafts are arranged in the differential case and can follow the differential speed. When the housing rotates, a planetary gear can float on each journal of the planetary gear shaft, and each planetary gear meshes with two side shaft gears respectively.

It should be understood that the symmetrical bevel gear differential 101 is already in the prior art and is well known to those skilled in the art, so the detailed structure and working principle of the symmetrical bevel gear differential 101 will not be specifically explained here. . Moreover, it should be noted that the above-mentioned example of the differential 101 being a symmetrical bevel gear differential is only a schematic illustration, and cannot be understood as a limitation to the present invention or as a hint that the power transmission system 100 according to the embodiment of the present invention This symmetrical bevel gear differential must be used.

The differential 101 has two power output ends. Taking the differential 101 as a symmetrical bevel gear differential as an example, the two power output ends can be two side gears, each power output such as a side gear The wheels 110 on this side are respectively connected with the axle shaft 108, that is to say, one end of each axle shaft 108 is connected with the axle gear so that the two can rotate synchronously, and the other end of each axle axle 108 is connected with the wheel 110 on the corresponding side. connected.

The final drive driven gear 102 is arranged on the differential 101 , specifically, the final drive driven gear 102 may be set on the differential housing. For example, the driven gear 102 of the final drive can be a bevel gear, and the bevel gear can be fixed on the differential case by rivets or bolts.

As shown in FIG. 1 , the two first motor generators 104 are respectively located on both sides of the differential 101 , that is, each first motor generator 104 is located between an output end of the differential 101 and the side wheel 110 . Each first motor-generator 104 is coaxially arranged on the half-shaft 108 on this side. Specifically, as shown in FIG. The hollow shaft 109 can be disposed on the corresponding semi-shaft 108 without sleeve, and the rotor of the first motor-generator 104 can be disposed on the corresponding semi-shaft 108 without sleeve.

Since the power transmission system 100 according to the embodiment of the present invention is respectively provided with a first motor generator 104 on both sides of the differential 101, the center of gravity of the power transmission system 100 according to the embodiment of the present invention can be located in the middle of the axle or Try to get as close to the middle of the axle as possible to avoid the center of gravity being heavily skewed to one side of the axle.

As shown in Fig. 1 , the motor power output shaft 111 is provided with a main reducer driving gear 103, and the main reducer driving gear 103 meshes with the main reducer driven gear 102, wherein two first motor generators 104 are respectively connected with the motor power The output shaft 111 cooperates with the transmission, in other words, the two first motor generators 104 are respectively linked with the motor power output shaft 111 , so that power can be transmitted between the motor power output shaft 111 and the first motor generator 104 .

Thus, the first motor generator 104 can directly output power to the wheels 110 through the motor power output shaft 111 and the differential gear 101 to drive the vehicle. In this way, the transmission chain is shorter and thus the transmission efficiency is higher.

At the same time, the first motor generator 104 can in turn absorb kinetic energy from the wheels 110 and generate electricity. Moreover, the two first motor generators 104 can work at the same time, of course, only one motor can be working at the same time, so that the working motor can be within a better working range.

In addition, even if one of the first motor-generators 104 fails, the other first motor-generator 104 can still work normally to provide power to ensure the normal running of the vehicle.

In some embodiments of the present invention, each first motor-generator 104 and the motor power output shaft 111 can be indirectly transmitted through the gear transmission assembly 105 . By setting the gear transmission assembly 105, on the one hand, it is convenient for the motor power output shaft 111 to couple the output power of the two first motor generators 104;

Further, the gear transmission assembly 105 may include two gears, namely a first gear 107 and a second gear 106, the first gear 107 may be fixedly arranged on the motor power output shaft 111, the second gear 106 is connected to the first motor generator 104 The motor shaft is connected and meshed with the first gear 107 . Adopting two gear transmissions can shorten the transmission chain, improve the transmission efficiency, and can also obtain the required transmission ratio at the same time.

As a preferred embodiment, the driving gear 103 of the final reducer is located between the two first gears 107 , specifically, the two first gears 107 may be respectively located at both ends of the power output shaft 111 of the motor.

As a preferred embodiment, the lengths of the two half shafts 108 on both sides of the differential 101 can be set to be the same, and further, the two first motor generators 104 are symmetrically arranged left and right with respect to the differential 101 . Therefore, the center of gravity of the power transmission system 100 according to the embodiment of the present invention can be better located at or close to the middle position of the axle, so that the stability and balance of the power transmission system 100 are better. At the same time, setting the half shafts 108 to have the same length can also improve the versatility of the half shafts 108 and reduce costs.

However, it should be understood that the present invention is not limited thereto, and in other embodiments of the present invention, the lengths of the two half shafts 108 on both sides of the differential 101 can also be set to be different according to needs. The same half shaft 108 is only a preferred embodiment of the present invention, and should not be construed as a limitation of the present invention.

As shown in FIG. 1 , the two first motor generators 104 can be used as power sources to output power at the same time, and the two parts of power can be coupled on the motor power output shaft 111 , and the coupled power can be distributed to the two parts through the differential 101. The axle shaft 108 on the side finally transmits the power to the wheels 110 to drive the vehicle.

Optionally, only one of the two first motor generators 104 may be in the working state, and the other may be in the follow-up or generating state. Optionally, the first motor-generator 104 can absorb braking energy when the vehicle is braking or the first motor-generator 104 can absorb kinetic energy from the wheels 110 (drag back through the wheels 110 ), thereby generating electricity.

The two first motor-generators 104 can also be adjusted mutually, so that the first motor-generator 104 can always be in a better working range, improve the transmission efficiency, and when one of the motors fails, the other motor can still be normal. Work, meet the power required by the normal driving of the vehicle, and play the role of a backup power source.

In summary, overall, according to the power transmission system 100 of the embodiment of the present invention, by arranging a first motor generator 104 on both sides of the differential 101, the power transmission system 100 has better symmetry, and the center of gravity It is in the middle of the axle or closer to the middle of the axle, and the two first motor generators 104 are linked through the motor power output shaft 111, so that the two first motor generators 104 can be adjusted to each other, so that the motor can always work at the optimum In the optimal range, and when one motor fails, the other motor can work normally, which greatly improves the stability and reliability of the power transmission system 100 .

In addition, embodiments according to the present invention further provide a vehicle including the power transmission system 100 as described above. It should be understood that other components of the vehicle according to the embodiment of the present invention, such as driving system, steering system, braking system, etc., are prior art and well known to those skilled in the art, so the details of the known structures The explanation is omitted here.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (8)

1. for a power drive system for vehicle, it is characterized in that, comprising:

Diff, described diff has two diff clutch ends, and each described diff clutch end is connected by semiaxis with the wheel of this side respectively;

Main reduction gear driven gear, described main reduction gear driven gear is located on described diff;

Two the first dynamotors, described two the first dynamotors lay respectively at the both sides of described diff, and each described first dynamotor coaxially empty set is arranged on the described semiaxis of this side;

Motor power output shaft, described motor power output shaft is provided with main reduction gear driving gear, described main reduction gear driving gear engages with described main reduction gear driven gear, and described two the first dynamotors coordinate transmission with described motor power output shaft respectively.

2. the power drive system for vehicle according to claim 1, is characterized in that, by gear-driven assembly transmission between each described first dynamotor and described motor power output shaft.

3. the power drive system for vehicle according to claim 2, it is characterized in that, described gear-driven assembly comprises: the first gear and the second gear, described first gear is fixedly installed on described motor power output shaft, described second gear be connected with the motor shaft of described first dynamotor and with described first gears meshing.

4. the power drive system for vehicle according to claim 3, is characterized in that, described main reduction gear driving gear is between two described first gears.

5. the power drive system for vehicle according to claim 2, is characterized in that, the motor shaft of described first dynamotor is hollow shaft and is set on corresponding described semiaxis.

6. the power drive system for vehicle according to claim 1, is characterized in that, the length of two semiaxis of described diff both sides is identical.

7. the power drive system for vehicle according to claim 1, is characterized in that, described two the first dynamotors are symmetrically arranged about described diff.

8. a vehicle, is characterized in that, comprises the power drive system for vehicle according to any one of claim 1-7.