CN113696705A

CN113696705A - Multi-motor speed change system

Info

Publication number: CN113696705A
Application number: CN202111065649.8A
Authority: CN
Inventors: 郝庆军; 冯涛; 王琳; 陆中华; 朱学军
Original assignee: Capotech Suzhou Co ltd
Current assignee: Capotech Suzhou Co ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2021-11-26

Abstract

The invention provides a multi-motor speed change system, which changes the single intermediate shaft structure of the original dual-motor speed changer into a dual-intermediate shaft structure, all the idle gears and the shafts do not need to be supported by needle roller bearings any more, and simultaneously, because the power is divided to two same intermediate shafts, the center distance can be reduced, the tooth width is narrowed, the volume of a gearbox is more compact, the occupied space is reduced, and the cost is reduced; adopt the scheme that two motor output shafts adopted the nested axle and arranged at the actuating system homonymy to replace the scheme that two motor bilateral symmetry arranged among the prior art, further improve actuating system inside and arrange the compactness, reduce the shared space and the volume of actuating system, reduce weight, reduce the heavy burden of whole car, further reduce vibration and noise, guarantee safe in utilization, increase of service life.

Description

Multi-motor speed change system

Technical Field

The invention relates to the field of new energy transmissions, in particular to a multi-motor speed change system.

Background

In the prior art, a dual-motor transmission (CN 109703357B) usually adopts a single-intermediate-shaft structure, so that on one hand, the speed ratio difference is large when gears are shifted among gears, the shifting impact and abrasion are possibly large when the gears are shifted, and the utilization rate of gears is low; on the other hand, all the hollow gears are connected with the shaft through needle bearings, the power is concentrated on a single intermediate shaft, the center distance is large, the tooth width is wide, and the size of the gearbox is large; meanwhile, in the prior art, the scheme that double motors are positioned on two sides of the speed changing system is adopted, the number of gear sets in the gearbox is large, and parts such as clutches and synchronizers are dispersed, so that the overall size of the gearbox is large, the weight is heavy, and the load of the whole vehicle is increased; meanwhile, the power part and the power transmission route are concentrated on one side, so that the vehicle body is unevenly arranged, and the weight of the vehicle body is uneven, the use loss and the potential safety hazard are possibly caused; in addition, the arrangement scheme of the double motors always keeps the power output of one motor when shifting gears so as to realize that the power is not interrupted when shifting gears, but the condition of insufficient power still exists in the process of temporary shifting gears.

Disclosure of Invention

In order to solve the defects and shortcomings in the prior art, the invention provides a multi-motor speed change system.

The technical scheme provided by the invention is as follows: a multi-motor transmission system comprising:

a first electric machine (EM 1), the output shaft (1) of the first electric machine (EM 1) is connected with a first intermediate shaft (3) through a first electric machine input gear pair (EGR 1);

a second electric machine (EM 2), the output shaft (2) of the second electric machine (EM 2) is connected with a second intermediate shaft (4) through a second electric machine input gear pair (EGR 2);

a first intermediate shaft (3), wherein the first intermediate shaft (3) is connected with a speed change system output shaft (5) through a first intermediate shaft gear pair;

the second intermediate shaft (4), the said second intermediate shaft (4) passes the second intermediate shaft gear pair to connect the output shaft (5) of the speed change system;

a first clutch A (16), said first clutch A (16) being disposed on the second countershaft (4) and being selectively engageable with a gear of the second countershaft gear pair;

a second clutch CU (17), said second clutch CU (17) being arranged on the end of the first intermediate shaft (3) close to the second intermediate shaft (4) and being selectively engageable with the second intermediate shaft (4) or selectively engageable with a gear of the first intermediate shaft gear pair;

the output shaft (1) of the first motor (EM 1) and the output shaft (2) of the second motor (EM 2) are nested shafts and are positioned on the same side of the driving system.

Further, the electric engine further comprises a third electric machine (EM 3), and an output shaft (19) of the third electric machine (EM 3) is connected with the output shaft (5) of the speed change system through a third electric machine input gear pair (EGR 3).

Further, the third motor input gear pair (EGR 3) comprises a third motor input driving gear (20) and a third motor input driven gear (21) which are correspondingly meshed, the third motor input driving gear (20) is fixedly connected with an output shaft (19) of a third motor (EM 3), and the third motor input driven gear (21) is fixedly connected with a transmission system output shaft (5).

Furthermore, the first countershaft gear pair comprises a second gear pair (GR 2), the second gear pair (GR 2) comprises a second driving gear (12) which is sleeved on the first countershaft (3) in a hollow mode and a second driven gear (13) which is fixed on the output shaft (5) of the speed changing system, and the second driving gear (12) is correspondingly meshed with the second driven gear (13).

Further, the second countershaft gear pair includes a first gear pair (GR 1) to the left of the first clutch a (16) and a third gear pair (GR 3) to the right of the first clutch a (16);

the first gear pair (GR 1) comprises a first driving gear (10) which is sleeved on the second intermediate shaft (4) in a hollow mode and a first driven gear (11) which is fixed on the output shaft (5) of the speed changing system, and the first driving gear (10) is correspondingly meshed with the first driven gear (11);

the third gear pair (GR 3) comprises a third driving gear (14) which is sleeved on the second intermediate shaft (4) in an empty mode and a third driven gear (15) which is fixed on the output shaft (5) of the speed changing system, and the third driving gear (14) is correspondingly meshed with the third driven gear (15).

Further, the third gear pair (GR 3) is located between the first gear pair (GR 1) and the second gear pair (GR 2).

Further, the first motor input gear pair (EGR 1) comprises a first motor input driving gear (6) and a first motor input driven gear (7) which are meshed correspondingly, the first motor input driving gear (6) is fixedly connected with an output shaft (1) of a first motor (EM 1), and the first motor input driven gear (7) is fixedly connected with a first intermediate shaft (3).

Further, the second motor input gear pair (EGR 2) comprises a second motor input driving gear (8) and a second motor input driven gear (9) which are correspondingly meshed, the second motor input driving gear (8) is fixedly connected with the output shaft (2) of the second motor (EM 2), and the second motor input driven gear (9) is fixedly connected with the second intermediate shaft (4).

Further, the working positions of the clutches under each gear of the driving system are as follows:

1) in neutral, the first clutch a is centered and the second clutch CU is centered;

2) in the 1-gear stage, the first clutch A is connected with a gear of a gear pair of the second intermediate shaft on one side, and the second clutch CU is connected with the second intermediate shaft on one side;

3) in the gear 2, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on one side, and the second clutch CU is engaged with the gear of the first intermediate shaft gear pair on the other side;

4) in the gear 3, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on the other side, and the second clutch CU is engaged with the gear of the first intermediate shaft gear pair on the other side;

5) in the 4-gear stage, the first clutch a is engaged with the gear of the second intermediate shaft gear pair on the other side, and the second clutch CU is engaged with the second intermediate shaft on one side.

There is also provided a multi-motor speed change system comprising:

a second clutch CU (17), said second clutch CU (17) being arranged on the first intermediate shaft (3) near the end of the second intermediate shaft (4) and being selectively engageable with the second intermediate shaft (4),

a third clutch B (18), said third clutch (18) being arranged on the first countershaft (3) and being selectively engageable with a gear of the first countershaft gear pair;

Further, the second clutch CU (17) is located between the first clutch a (16) and the third clutch (18); the third gear pair (GR 3) is located between the first gear pair (GR 1) and the second gear pair (GR 2).

Further, the working positions of the clutches under each gear of the speed changing system are as follows:

1) during neutral, the first clutch A is in the middle, the second clutch CU is not engaged, and the third clutch B is not engaged;

2) when the gear 1 is shifted, the first clutch A is engaged with a gear of a gear pair of a second intermediate shaft on one side, the second clutch CU is engaged with the second intermediate shaft on one side, and the third clutch B is not engaged;

3) in the gear 2, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on one side, the second clutch CU is not engaged, and the third clutch B is engaged with the gear of the first intermediate shaft gear pair on one side;

4) in the 3-gear stage, the first clutch A is in the middle, the second clutch CU is connected with the second intermediate shaft on one side, and the third clutch B is connected with the gear of the gear pair of the first intermediate shaft on one side;

5) in the 4-gear stage, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on the other side, the second clutch CU is not engaged, and the third clutch B is engaged with the gear of the first intermediate shaft gear pair on one side;

6) in the 5-gear stage, the first clutch a is engaged with the gear of the second intermediate shaft gear pair on the other side, the second clutch CU is engaged with the second intermediate shaft on the one side, and the third clutch B is not engaged.

Compared with the prior art, the invention has the following beneficial effects:

1) the invention provides a multi-motor speed change system, which changes the single intermediate shaft structure of the original dual-motor speed changer into a dual-intermediate shaft structure, all the idle gears and the shafts do not need to be supported by needle roller bearings any more, and simultaneously, because power is divided to two identical intermediate shafts, the center distance can be reduced, the tooth width is narrowed, the volume of a gearbox is more compact, the occupied space is reduced, and the cost is reduced.

2) The invention provides a multi-motor speed change system, which always keeps at least one motor to output power in the gear shifting process so as to realize continuous power output without interruption in the gear shifting process; meanwhile, by introducing the third motor, extra power can be provided in the gear shifting process or in the normal running process, and the defect of insufficient power is overcome.

3) The multi-motor speed change system provided by the invention adopts the nested shaft as the output shaft of the double motors, further improves the internal arrangement compactness of the driving system, reduces the occupied space and volume of the driving system, reduces the weight, reduces the load of the whole vehicle, further reduces the vibration and the noise, ensures the use safety and prolongs the service life.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 3 of the present invention.

Fig. 4 is a schematic structural diagram of embodiment 4 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

[ EXAMPLE 1 ]

Fig. 1 shows a1 st embodiment of a multiple-motor transmission system according to the present invention, which includes:

a first electric machine EM1, the output shaft 1 of which EM1 is connected to the first intermediate shaft 3 through a first electric machine input gear pair EGR 1; specifically, as a further preferable solution of the present embodiment, the first motor input gear pair EGR1 includes a first motor input driving gear 6 and a first motor input driven gear 7 which are correspondingly engaged, the first motor input driving gear 6 is fixedly connected with the output shaft 1 of the first motor EM1, and the first motor input driven gear 7 is fixedly connected with the first intermediate shaft 3; the first electric machine input gear pair EGR1 is used to transmit the output power of the first electric machine EM1 to the first countershaft 3.

The scheme disclosed by the embodiment further comprises a second electric motor EM2, wherein the output shaft 2 of the second electric motor EM2 is connected with a second intermediate shaft 4 through a second electric motor input gear pair EGR 2; specifically, as a further preferable solution of the present embodiment, the second motor input gear pair EGR2 includes a second motor input driving gear 8 and a second motor input driven gear 9 which are engaged with each other, the second motor input driving gear 8 is fixedly connected to the output shaft 2 of the second motor EM2, and the second motor input driven gear 9 is fixedly connected to the second intermediate shaft 4, and the second motor input gear pair EGR2 is configured to transmit the output power of the second motor EM2 to the second intermediate shaft 4.

The scheme disclosed by the embodiment further comprises a first intermediate shaft 3, wherein the first intermediate shaft 3 is connected with a speed change system output shaft 5 through a first intermediate shaft gear pair; specifically, as a further preferable solution of the present embodiment, the first countershaft gear pair includes a second gear pair GR2, the second gear pair GR2 includes a second driving gear 12 that is freely sleeved on the first countershaft 3 and a second driven gear 13 that is fixed on the transmission output shaft 5, and the second driving gear 12 is correspondingly engaged with the second driven gear 13; the first countershaft 3 can be selectively engaged or disengaged with the one-sided second countershaft 4 or the first countershaft 3 can be selectively engaged or disengaged with a gear of the one-sided second gear set GR2 by the second clutch CU 17.

The scheme disclosed by the embodiment further comprises a second intermediate shaft 4, wherein the second intermediate shaft 4 is connected with a speed change system output shaft 5 through a second intermediate shaft gear pair; specifically, as a further preferred version of this embodiment, the second countershaft gear set includes a first gear set GR1 to the left of the first clutch a16 and a third gear set GR3 to the right of the first clutch a 16.

The first gear pair GR1 comprises a first driving gear 10 sleeved on the second intermediate shaft 4 in a hollow manner and a first driven gear 11 fixed on the output shaft 5 of the speed change system, and the first driving gear 10 is correspondingly engaged with the first driven gear 11; the third gear pair GR3 comprises a third driving gear 14 loosely sleeved on the second intermediate shaft 4 and a third driven gear 15 fixed on the output shaft 5 of the speed change system, and the third driving gear 14 is correspondingly engaged with the third driven gear 15; the second intermediate shaft 4 can be selectively engaged or disengaged with the first driving gear 10 on one side or the third driving gear 14 on the other side by the first clutch a 16.

A first clutch a16, a first clutch a16 is provided on the second countershaft 4 and is selectively engageable with a gear of the second countershaft gear pair.

A second clutch CU17, said second clutch CU17 being provided on the end of the first countershaft 3 close to the second countershaft 4 and being selectively engageable with the second countershaft 4 or alternatively with a gear of the first countershaft gear pair.

The output shaft 1 of the first electric motor EM1 and the output shaft 2 of the second electric motor EM2 are nested shafts and are positioned on the same side of the driving system; adopt bi-motor output shaft to adopt the nested axle just, further improve the inside compactness of arranging of actuating system, reduce the occupied space and the volume of actuating system, reduce weight, reduce the heavy burden of whole car, further reduce vibration and noise, guarantee safe in utilizationly, increase of service life.

Specifically, as a further preferable solution of this embodiment, the third gear pair GR3 is located between the first gear pair GR1 and the second gear pair GR2, so as to further simplify the internal arrangement space and size of the driving system, and reduce the weight.

[ EXAMPLE 2 ]

Fig. 2 shows a 2 nd embodiment of the multi-motor transmission system, which is different from the 1 st embodiment only in that the multi-motor transmission system further comprises a third electric motor EM3, and an output shaft 19 of the third electric motor EM3 is connected with a transmission system output shaft 5 through a third electric motor input gear pair EGR 3; specifically, as a further preferable solution of the present embodiment, the third motor input gear pair EGR3 includes a third motor input driving gear 20 and a third motor input driven gear 21 which are correspondingly engaged, the third motor input driving gear 20 is fixedly connected with the output shaft 19 of the third motor EM3, and the third motor input driven gear 21 is fixedly connected with the transmission system output shaft 5; the third electric machine input gear pair EGR3 is used to transfer the output power of the third electric machine EM3 to the transmission system output shaft 5.

As shown in table 1, the operating positions of the clutches in each gear of the driving system according to embodiment 1 are:

2) in the 1-gear stage, the first clutch A is connected with a gear of a gear pair of the second intermediate shaft on one side, and the second clutch CU is connected with the second intermediate shaft on one side; when the first intermediate shaft 3 and the second intermediate shaft 4 are engaged, the first electric machine EM1 and the second electric machine EM2 jointly output power, and the power is output from the output shaft 5 of the speed change system through the first gear pair GR 1;

3) in the gear 2, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on one side, and the second clutch CU is engaged with the gear of the first intermediate shaft gear pair on the other side; at the moment, the first intermediate shaft 3 and the second intermediate shaft 4 are disengaged, the output power of the first electric motor EM1 is output from the output shaft 5 of the speed change system through the first gear pair GR1, and the output power of the second electric motor EM2 is output from the output shaft 5 of the speed change system through the second gear pair GR 2;

4) in the gear 3, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on the other side, and the second clutch CU is engaged with the gear of the first intermediate shaft gear pair on the other side; at the moment, the first intermediate shaft 3 and the second intermediate shaft 4 are disengaged, the output power of the first electric motor EM1 is output from the output shaft 5 of the speed change system through the third gear pair GR3, and the output power of the second electric motor EM2 is output from the output shaft 5 of the speed change system through the second gear pair GR 2;

5) in the 4-gear stage, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on the other side, and the second clutch CU is engaged with the second intermediate shaft on one side; when the first intermediate shaft 3 and the second intermediate shaft 4 are engaged, the first electric machine EM1 and the second electric machine EM2 jointly output power, and the power is output from the output shaft 5 of the speed change system through the third gear pair GR 3;

TABLE 1 EXAMPLE LOCATION TABLE FOR CLUTCH OPERATION IN THE DRIVE SYSTEM IN THE RANGE

Note: ● indicates the current position of each clutch; l represents left engagement; r represents a right bond; n represents a centered bit (i.e., not joined).

The operating positions of the clutches in each gear of the drive system of embodiment 2 are the same as those in embodiment 1, except that the third electric motor EM3 always outputs power to the output shaft 5 of the transmission system through the third electric motor input gear pair EGR3 in each gear.

And at least one motor is always kept to output power in the gear shifting process, so that the continuous power output in the gear shifting process is uninterrupted.

[ 3 rd example ]

Fig. 3 shows a 3 rd embodiment of a multi-motor transmission system according to the present invention, which includes:

The scheme disclosed by the embodiment further comprises a second electric motor EM2, wherein the output shaft 2 of the second electric motor EM2 is connected with a second intermediate shaft 4 through a second electric motor input gear pair EGR 2; specifically, as a further preferable solution of the present embodiment, the second motor input gear pair EGR2 includes a second motor input driving gear 8 and a second motor input driven gear 9 which are correspondingly engaged, the second motor input driving gear 8 is fixedly connected with the output shaft 2 of the second motor EM2, and the second motor input driven gear 9 is fixedly connected with the second intermediate shaft 4; the second electric machine input gear pair EGR2 is used to transmit the output power of the second electric machine EM2 to the second intermediate shaft 4.

The scheme disclosed by the embodiment further comprises a first intermediate shaft 3, wherein the first intermediate shaft 3 is connected with a speed change system output shaft 5 through a first intermediate shaft gear pair; specifically, as a further preferable solution of the present embodiment, the first countershaft gear pair includes a second gear pair GR2, the second gear pair GR2 includes a second driving gear 12 that is freely sleeved on the first countershaft 3 and a second driven gear 13 that is fixed on the transmission output shaft 5, and the second driving gear 12 is correspondingly engaged with the second driven gear 13; the first intermediate shaft 3 can be selectively engaged or disengaged with the second driving gear 12 on one side through the third clutch B18;

The first gear pair GR1 includes a first driving gear 10 that is freely sleeved on the second intermediate shaft 4 and a first driven gear 11 that is fixed on the output shaft 5 of the transmission system, and the first driving gear 10 is correspondingly engaged with the first driven gear 11.

The third gear pair GR3 comprises a third driving gear 14 loosely sleeved on the second intermediate shaft 4 and a third driven gear 15 fixed on the output shaft 5 of the speed change system, and the third driving gear 14 is correspondingly engaged with the third driven gear 15; the second intermediate shaft 4 can be selectively engaged or disengaged with the first driving gear 10 on one side or the third driving gear 14 on the other side by the first clutch a 16.

A second clutch CU17, the second clutch CU17 being disposed on the first intermediate shaft 3 near the end of the second intermediate shaft 4 and being selectively engageable with the one-side second intermediate shaft 4.

A third clutch B18, the third clutch 18 is arranged on the first intermediate shaft 3 and can be selectively jointed with the gear of the gear pair of the first intermediate shaft on one side.

The output shaft 1 of the first electric motor EM1 and the output shaft 2 of the second electric motor EM2 are nested shafts and are positioned on the same side of the driving system; adopt bi-motor output shaft to adopt the nested axle, further improve the inside compactness of arranging of actuating system, reduce the occupied space and the volume of actuating system, reduce weight, reduce the heavy burden of whole car, further reduce vibration and noise, guarantee safe in utilizationly, increase of service life.

Specifically, as a further preferable aspect of the present embodiment, the second clutch CU17 is located between the first clutch a16 and the third clutch 18; the third gear pair GR3 is located between the first gear pair GR1 and the second gear pair GR 2; thereby further simplifying the internal arrangement space and size of the driving system and reducing the weight.

[ example 4 ]

Fig. 4 shows a 4 th embodiment of the multi-motor transmission system, which is different from the 3 rd embodiment only in that the multi-motor transmission system further comprises a third electric motor EM3, and an output shaft 19 of the third electric motor EM3 is connected with the transmission system output shaft 5 through a third electric motor input gear pair EGR 3; specifically, as a further preferable solution of the present embodiment, the third motor input gear pair EGR3 includes a third motor input driving gear 20 and a third motor input driven gear 21 which are correspondingly engaged, the third motor input driving gear 20 is fixedly connected with the output shaft 19 of the third motor EM3, and the third motor input driven gear 21 is fixedly connected with the transmission system output shaft 5; the third electric machine input gear pair EGR3 is used to transfer the output power of the third electric machine EM3 to the transmission system output shaft 5.

As shown in table 2, the operating positions of the clutches in each gear of the driving system according to embodiment 3 are:

2) when the gear 1 is shifted, the first clutch A is engaged with a gear of a gear pair of a second intermediate shaft on one side, the second clutch CU is engaged with the second intermediate shaft on one side, and the third clutch B is not engaged; when the first intermediate shaft 3 and the second intermediate shaft 4 are engaged, the first electric machine EM1 and the second electric machine EM2 jointly output power, and the power is output from the output shaft 5 of the speed change system through the first gear pair GR 1;

3) in the gear 2, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on one side, the second clutch CU is not engaged, and the third clutch B is engaged with the gear of the first intermediate shaft gear pair on one side; at the moment, the first intermediate shaft 3 and the second intermediate shaft 4 are disengaged, the output power of the first electric motor EM1 is output from the output shaft 5 of the speed change system through the first gear pair GR1, and the output power of the second electric motor EM2 is output from the output shaft 5 of the speed change system through the second gear pair GR 2;

4) in the 3-gear stage, the first clutch A is in the middle, the second clutch CU is connected with the second intermediate shaft on one side, and the third clutch B is connected with the gear of the gear pair of the first intermediate shaft on one side; at the moment, the first intermediate shaft 3 and the second intermediate shaft 4 are engaged, and the first electric machine EM1 and the second electric machine EM2 jointly output power which is output from the output shaft 5 of the speed change system through the second gear pair GR 2;

5) in the 4-gear stage, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on the other side, the second clutch CU is not engaged, and the third clutch B is engaged with the gear of the first intermediate shaft gear pair on one side; at the moment, the first intermediate shaft 3 and the second intermediate shaft 4 are disengaged, the output power of the first electric motor EM1 is output from the output shaft 5 of the speed change system through the third gear pair GR3, and the output power of the second electric motor EM2 is output from the output shaft 5 of the speed change system through the second gear pair GR 2;

6) in the gear 5, the first clutch A is engaged with the gear of the second intermediate shaft gear pair on the other side, the second clutch CU is engaged with the second intermediate shaft on one side, and the third clutch B is not engaged; at the moment, the first intermediate shaft 3 and the second intermediate shaft 4 are engaged, and the first electric motor EM1 and the second electric motor EM2 jointly output power from the output shaft 5 of the speed change system through the third gear pair GR 3.

TABLE 2 TABLE 3 TABLE OF OPERATING POSITIONS OF CLUTCH IN THE RANGE OF THE DRIVE SYSTEM

Note: ● indicates the current position of each clutch; l represents left engagement; r represents a right bond; y represents engaged and N represents a centered position (i.e., not engaged).

The operating positions of the clutches in each gear of the drive system of embodiment 4 are the same as those in embodiment 3, except that the third electric motor EM3 always outputs power to the output shaft 5 of the transmission system through the third electric motor input gear pair EGR3 in each gear.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A multi-motor transmission system comprising:

it is characterized by also comprising:

2. A multi-motor variable speed system according to claim 1, wherein: the system also comprises a third electric machine (EM 3), and an output shaft (19) of the third electric machine (EM 3) is connected with the output shaft (5) of the speed change system through a third electric machine input gear pair (EGR 3).

3. A multi-motor variable speed system according to claim 2, wherein: the third motor input gear pair (EGR 3) comprises a third motor input driving gear (20) and a third motor input driven gear (21) which are correspondingly meshed, the third motor input driving gear (20) is fixedly connected with an output shaft (19) of a third motor (EM 3), and the third motor input driven gear (21) is fixedly connected with an output shaft (5) of the speed change system.

4. A multiple motor variable speed system according to any one of claims 1 to 3, wherein: the first intermediate shaft gear pair comprises a second gear pair (GR 2), the second gear pair (GR 2) comprises a second driving gear (12) which is sleeved on the first intermediate shaft (3) in a hollow mode and a second driven gear (13) which is fixed on the output shaft (5) of the speed changing system, and the second driving gear (12) is correspondingly meshed with the second driven gear (13).

5. A multi-motor variable speed system according to claim 4, wherein: the second countershaft gear set comprising a first gear set (GR 1) to the left of first clutch A (16) and a third gear set (GR 3) to the right of first clutch A (16);

6. A multi-motor variable speed system according to claim 5, wherein: the third gear pair (GR 3) is located between the first gear pair (GR 1) and the second gear pair (GR 2).

7. A multiple motor variable speed system according to any one of claims 1 to 3, wherein: the first motor input gear pair (EGR 1) comprises a first motor input driving gear (6) and a first motor input driven gear (7) which are correspondingly meshed, the first motor input driving gear (6) is fixedly connected with an output shaft (1) of a first motor (EM 1), and the first motor input driven gear (7) is fixedly connected with a first intermediate shaft (3).

8. A multiple motor variable speed system according to any one of claims 1 to 3, wherein: the second motor input gear pair (EGR 2) comprises a second motor input driving gear (8) and a second motor input driven gear (9) which are correspondingly meshed, the second motor input driving gear (8) is fixedly connected with an output shaft (2) of a second motor (EM 2), and the second motor input driven gear (9) is fixedly connected with a second intermediate shaft (4).

9. A multiple motor variable speed system according to any one of claims 1 to 3, wherein: the working positions of the clutches under each gear of the driving system are as follows:

10. A multi-motor transmission system comprising:

it is characterized by also comprising:

11. A multi-motor variable speed system according to claim 10, wherein: the system also comprises a third electric machine (EM 3), and an output shaft (19) of the third electric machine (EM 3) is connected with the output shaft (5) of the speed change system through a third electric machine input gear pair (EGR 3).

12. A multi-motor transmission system according to claim 11, wherein: the third motor input gear pair (EGR 3) comprises a third motor input driving gear (20) and a third motor input driven gear (21) which are correspondingly meshed, the third motor input driving gear (20) is fixedly connected with an output shaft (19) of a third motor (EM 3), and the third motor input driven gear (21) is fixedly connected with an output shaft (5) of the speed change system.

13. A multiple motor variable speed system according to any one of claims 10 to 12, wherein: the first motor input gear pair (EGR 1) comprises a first motor input driving gear (6) and a first motor input driven gear (7) which are correspondingly meshed, the first motor input driving gear (6) is fixedly connected with an output shaft (1) of a first motor (EM 1), and the first motor input driven gear (7) is fixedly connected with a first intermediate shaft (3).

14. A multi-motor transmission system according to claim 13, wherein: the second countershaft gear set comprising a first gear set (GR 1) to the left of first clutch A (16) and a third gear set (GR 3) to the right of first clutch A (16);

15. A multi-motor variable speed system according to claim 14, wherein: the second clutch CU (17) is located between the first clutch A (16) and the third clutch (18); the third gear pair (GR 3) is located between the first gear pair (GR 1) and the second gear pair (GR 2).

16. A multiple motor variable speed system according to any one of claims 10 to 12, wherein: the second motor input gear pair (EGR 2) comprises a second motor input driving gear (8) and a second motor input driven gear (9) which are correspondingly meshed, the second motor input driving gear (8) is fixedly connected with an output shaft (2) of a second motor (EM 2), and the second motor input driven gear (9) is fixedly connected with a second intermediate shaft (4).

17. A multiple motor variable speed system according to any one of claims 10 to 12, wherein: the first intermediate shaft gear pair comprises a second gear pair (GR 2), the second gear pair (GR 2) comprises a second driving gear (12) which is sleeved on the first intermediate shaft (3) in a hollow mode and a second driven gear (13) which is fixed on the output shaft (5) of the speed changing system, and the second driving gear (12) is correspondingly meshed with the second driven gear (13).

18. A multiple motor variable speed system according to any one of claims 10 to 12, wherein: the working positions of the clutches under each gear of the speed change system are as follows: