Dual-motor and dual-planetary-gear power-split longitudinally-mounted hybrid transmission

Abstract

The present invention discloses a longitudinally-mounted hybrid transmission with a double-motor and double-planetary-gear power split, which includes a housing, an auxiliary motor, a drive motor, an input shaft and an output shaft. One end of the input shaft is connected to the engine, and the auxiliary motor shaft of the auxiliary motor is sleeved on the input shaft; the drive motor shaft of the drive motor is sleeved on the output shaft; a double planetary gear set is provided between the drive motor and the auxiliary motor, and a double brake is further included. The double brake includes a double brake disc, and a double brake first driven disc and a double brake second driven disc are respectively arranged on both sides of the double brake disc. The double brake first driven disc is fixedly arranged on the auxiliary motor shaft, and the double brake second driven disc is fixedly connected to the left planetary carrier. The beneficial effects of the present invention are mainly reflected in that: in this application, the auxiliary motor locking design is added. After the auxiliary motor is locked, the power output of the power generation branch of the power split is cut off, and the output power of the engine can be completely used for vehicle driving.

Description

Technical Field

[0001] The present invention relates to the technical field of casings, and more particularly to a longitudinally-mounted hybrid transmission with a double-motor and double-planetary-gear power split structure. Background Art

[0002] Hybrid vehicles are a practical solution to energy and environmental problems at the present stage. However, existing double-motor planetary-gear hybrid systems have certain defects.

[0003] For example, the authorized publication number CN110077219B discloses a double-planetary-gear hybrid system and its control method, including: an engine, a first motor, a second motor, a front planetary gear set, a rear planetary gear set, an input shaft, an output shaft, a flywheel assembly, first, second, and third mode clutches; the output end of the engine is connected to the input shaft, the input shaft is connected to the front planetary carrier, the first motor is connected to the front sun gear, the front ring gear is connected to the rear planetary carrier, the rear planetary carrier is connected to the output shaft, the second motor is connected to the rear sun gear, and the flywheel assembly is connected to the front sun gear through the first mode clutch and to the front ring gear through the second mode clutch.

[0004] Through analysis, it is found that the above invention has the following defects: 1. When the engine drives the vehicle, the ISG motor causes power splitting, and the output power of the engine cannot be fully used for vehicle driving, resulting in fuel waste; 2. When the engine drives, the TM motor cannot supplement engine power and recover braking energy, resulting in energy waste; 3. The setting of the flywheel increases the weight of the transmission, which is not conducive to overall lightweight design; 4. There is no parking function in the above patent. If parking is required, a new parking structure needs to be added, which greatly occupies the space of the transmission and is not conducive to layout. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a longitudinally-mounted hybrid transmission with a double-motor and double-planetary-gear power split structure.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A longitudinally-mounted hybrid transmission with a double-motor and double-planetary-gear power split structure, including a casing, an auxiliary motor, a driving motor, an input shaft, and an output shaft. One end of the input shaft is connected to the engine, and the auxiliary motor shaft of the auxiliary motor is sleeved on the input shaft; the driving motor shaft of the driving motor is sleeved on the output shaft;

[0008] A double planetary gear set is provided between the driving motor and the auxiliary motor. The double planetary gear set includes at least a left planet carrier, a left sun gear, a right planet carrier, a right sun gear, and an external gear ring. The left planet carrier is fixedly arranged at the other end of the input shaft. The left sun gear is fixedly arranged on the auxiliary motor shaft. The right sun gear is fixedly arranged on the driving motor shaft. The external gear ring is fixedly arranged on the output shaft.

[0009] It further includes a double brake. The double brake includes a double brake disc fixedly arranged in the housing. On both sides of the double brake disc, there are respectively a double brake first driven disc and a double brake second driven disc that can be combined with or separated from it. The double brake first driven disc is fixedly arranged on the auxiliary motor shaft. The double brake second driven disc is fixedly connected to the left planet carrier.

[0010] Preferably, the input shaft and the output shaft are coaxially arranged. The output shaft is sleeved on the input shaft.

[0011] Preferably, a shock-absorbing disc is also fixedly arranged on the input shaft. The shock-absorbing disc is located between the engine and the auxiliary motor.

[0012] Preferably, a left planet gear is provided between the left sun gear and the external gear ring. The left planet gear is pivotally arranged on the left planet carrier. A right planet gear is provided between the right sun gear and the external gear ring. The right planet gear is pivotally arranged on the right planet carrier. The right planet carrier is fixedly arranged on the housing.

[0013] Preferably, a single brake is fixedly arranged on the external gear ring. The single brake includes a single brake disc fixedly arranged in the housing. The single brake disc is combined with or separated from a single brake driven disc arranged on one side of it. The single brake driven disc is fixedly connected to the external gear ring.

[0014] Preferably, the double brake is a wet mechanical clutch.

[0015] The beneficial effects of the present invention are mainly reflected in:

[0016] 1. This application adds a design for locking the auxiliary motor. Different from the traditional power split scheme, the output torque of the engine needs to be supported by the power generation torque of the auxiliary motor. After the auxiliary motor is locked, the power outflow of the power generation branch of the power split is cut off, and the output power of the engine can be fully used for driving the vehicle. In the case of high-speed driving of the vehicle, the good fuel economy of the engine in high-speed driving conditions can be fully utilized.

[0017] 2. When the engine is driving, the driving motor can be used as a supplement to the engine power and for recovering braking energy, avoiding energy loss and improving the recovery efficiency.

[0018] 3. The two brakes are respectively locked with the left sun gear and connected to the left planet carrier, and are used for engine locking and auxiliary motor locking. When the engine is locked, the pure electric drive condition of the dual motors can be satisfied. When in auxiliary locking, it is the direct drive condition of the engine. Therefore, the setting of the two brakes can meet the requirements of various working conditions and has wide applicability.

[0019] 4. The setting of the single brake can play a parking role. Compared with the prior art, the single brake is highly integrated with the external gear ring, reducing the occupied space of the parking structure in the gearbox and facilitating reasonable layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0021] Figure 1 : Structural schematic diagram of a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included in the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] As Figure 1 shown, the present invention discloses a longitudinally-mounted hybrid transmission with a dual-motor and dual-planetary-gear power split, including a housing, an auxiliary motor 41, a drive motor 51, an input shaft 1, and an output shaft 2. One end of the input shaft 1 is connected to an engine 11, and a shock-absorbing disc 12 is also fixedly provided on the input shaft 1. The shock-absorbing disc 12 is located between the engine 11 and the auxiliary motor 41. The auxiliary motor shaft 4 of the auxiliary motor 41 is sleeved on the input shaft 1; the drive motor shaft 5 of the drive motor 51 is sleeved on the output shaft 2; in this preferred embodiment, the input shaft 1 and the output shaft 2 are coaxially arranged, and the output shaft 2 is sleeved on the input shaft 1. Of course, the input shaft 1 and the output shaft 2 can also be disconnected, or other connection methods can be adopted, which all fall within the protection scope of the present invention and will not be elaborated here. In addition, the auxiliary motor 41 and the drive motor 51 can be arranged inside the housing or outside the housing, which all fall within the protection scope of the present invention and will not be elaborated here.

[0027] A dual-planetary gear 3 is provided between the drive motor 51 and the auxiliary motor 41. The dual-planetary gear 3 at least includes a left planet carrier 31, a left sun gear 32, a right planet carrier 37, a right sun gear 34, and an outer ring gear 33. The left planet carrier 31 is fixedly provided at the other end of the input shaft 1, the left sun gear 32 is fixedly provided on the auxiliary motor shaft 4, the right sun gear 34 is fixedly provided on the drive motor shaft 5, and the outer ring gear 33 is fixedly provided on the output shaft 2; a left planet gear 35 is provided between the left sun gear 32 and the outer ring gear 33, and the left planet gear 35 is pivotally arranged on the left planet carrier 31; a right planet gear 36 is provided between the right sun gear 34 and the outer ring gear 33, and the right planet gear 36 is pivotally arranged on the right planet carrier 37, and the right planet carrier 37 is fixedly provided on the housing. By fixedly providing the right planet carrier 37 on the housing, the electric drive speed ratio is 2.333, plus the rear axle speed ratio of about 4, the total speed ratio is about 9.332. When at the maximum vehicle speed of 180 Km / h, the drive motor speed is 12,500 r / min, the requirements for the drive motor and the bearing limit speed are not high, and low-specification motors and bearings can be selected, thereby reducing costs. It has the same speed ratio as the existing ordinary single-gear pure electric drive, which is more practical. In the case of engine drive, the drive motor can be used as engine power supplement and braking energy recovery.

[0028] The present invention further includes a double brake 6, which is a wet mechanical clutch controlled by a worm and worm gear of a micro-motor control box connected to the housing. In the above, the double brake 6 is respectively connected to lock the left sun gear and the left planetary carrier, and is used for engine locking and auxiliary motor locking. When the engine is locked, the pure electric drive condition of the dual-motor can be satisfied. When in auxiliary locking, it is the direct drive condition of the engine. Therefore, the setting of the double brake can meet the requirements of various working conditions and has wide applicability. In the above, the double brake 6 includes a double brake disc 61 fixed in the housing. On both sides of the double brake disc 61, there are respectively a first double brake driven disc 62 and a second double brake driven disc 63 that can be combined with or separated from it. The first double brake driven disc 62 is fixed on the auxiliary motor shaft 4, and the second double brake driven disc 63 is fixedly connected to the left planetary carrier 31.

[0029] A single brake 7 is fixed on the outer ring gear 33. The single brake 7 includes a single brake disc 71 fixed in the housing. The single brake disc 71 is combined with or separated from a single brake driven disc 72 arranged on one side of it. The single brake driven disc 72 is fixedly connected to the outer ring gear 33. The setting of the single brake can play a role in parking. Compared with the prior art, the single brake and the outer ring gear are highly integrated, reducing the occupied space of the parking structure in the gearbox and facilitating reasonable layout.

[0030] The working process of the present invention is briefly described below:

[0031] I. Parking power generation condition:

[0032] The first double brake driven disc 62 and the second double brake driven disc 63 are separated from the double brake disc 61, and the single brake driven disc 72 is combined with the single brake disc 71. At this time, the engine 11 starts, and drives the auxiliary motor 41 to rotate and generate electricity in sequence through the input shaft 1, the left planetary carrier 31 and the left sun gear 32. Its speed ratio is the inherent speed ratio of the double planetary row 3, the number of teeth of the outer ring gear / the number of teeth of the sun gear. The preliminary design scheme is 2.333 + 1 = 3.333, that is, the power generation speed of the auxiliary motor 41 is 3.333 times that of the engine speed, and the power generation torque is 0.3 times that of the engine output torque.

[0033] In the parking power generation condition, although the outer ring gear does not rotate, the driving torque applied to the outer ring gear by the engine output torque through the left planet gear always exists. Release the single brake 7 and the brake pedal, and this torque can drive the vehicle forward. Therefore, in the parking power generation condition, opening the single brake 7 and releasing the brake pedal can realize the start of the engine hybrid state. The starting torque during the starting process needs to be controlled by the auxiliary motor and the engine torque. When necessary or in an emergency start, the driving motor can be used to assist the driving torque to start.

[0034] II. Pure electric drive condition:

[0035] The second driven disc 63 of the double brake is combined with the double brake disc 61, the first driven disc 62 of the double brake is separated from the double brake disc 61, the driven disc 72 of the single brake is separated from the single brake disc 71, and the drive motor 51 is started. The power is transmitted to the external gear ring in sequence through the drive motor shaft, the right sun gear, and the right planet gear; the auxiliary motor is started, and the power is transmitted to the external gear ring in sequence through the auxiliary motor shaft, the left sun gear, and the left planet gear. The simultaneous drive of the drive motor 51 and the auxiliary motor can enable the gearbox to exert super strong pure electric driving force. Of course, the drive motor 51, as the main drive motor, can drive the vehicle forward alone, and the auxiliary motor can provide auxiliary driving force or can be in an idling state. In the above, the star train speed ratio parameter is the number of teeth of the internal gear of the external gear ring / the number of teeth of the sun gear. The speed ratio of the rear drive axle is assumed to be about 4, and the drive speed ratio of the two motors is 9.332, which is basically consistent with the speed ratio required for electric drive.

[0036] III. Reverse condition:

[0037] The first driven disc 62 and the second driven disc 63 of the double brake are combined with the double brake disc 61, the driven disc 72 of the single brake is separated from the single brake disc 71, and the drive motor 51 is started and reversed. The power is transmitted to the output shaft in sequence through the auxiliary motor shaft, the left sun gear, the left planet gear, and the external gear ring. When necessary, the auxiliary motor can also participate in reverse driving.

[0038] IV. Brake energy recovery:

[0039] In the pure electric drive condition, the drive motor 51 is changed from the drive state to the power generation state, and the kinetic energy of the vehicle during driving can be converted into electric energy for storage, realizing the brake energy recovery function. The brake energy recovery is mainly distributed by the drive motor 51 and supplemented by the auxiliary motor.

[0040] V. Power split hybrid drive condition:

[0041] The first driven disc 62 and the second driven disc 63 of the double brake are separated from the double brake disc 61, and the driven disc 72 of the single brake is separated from the single brake disc 71. At this time, the engine 11 is started and shunted through the double planetary train, and is transmitted in two directions. One part drives the auxiliary motor to generate electricity through the left sun gear, and the other part drives the vehicle forward through the external gear ring and the output shaft.

[0042] In this operating condition, the auxiliary motor is always in the power generation state and provides torque support for the engine. Its power generation torque is 0.3 times the output torque of the engine. The external gear ring transmits the remaining 0.7 times of the engine torque to the output shaft for vehicle driving. The drive motor is in an idling state, and the engine can also operate stably at a fixed torque speed. The vehicle's acceleration and deceleration are supplemented by the drive motor through torque adjustment. This operating condition also recovers braking energy through the drive motor.

[0043] VI. Engine direct drive operating condition:

[0044] The second driven disk 63 of the double brake is separated from the double brake disk 61, the first driven disk 62 of the double brake is combined with the double brake disk 61, and the driven disk 72 of the single brake is separated from the single brake disk 71. At this time, the engine starts, and its power is not shunted and is completely used for vehicle driving, which is suitable for high-speed operating conditions. According to the speed ratio of 0.7 between the planet carrier and the external gear ring of the power split double planetary row and the rear drive axle speed ratio of about 4, the speed ratio of engine direct drive is 2.8. When the vehicle is driving at a speed of 120 Km / h on the highway, the engine speed is about 2500 r / min. Therefore, the engine direct drive operating condition is suitable for high-speed driving conditions and can better exert the ultra-high fuel efficiency of the engine.

[0045] In the above, the speed ratios in the text are for the description of this patent. In the actual implementation process, other speed ratios should also be included in the protection scope of this patent.

[0046] It should be understood that although this specification is described according to the implementation manners, not every implementation manner only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each implementation manner can also be appropriately combined to form other implementation manners that can be understood by those skilled in the art.

[0047] The series of detailed descriptions listed above are only specific descriptions of the feasible implementation manners of the present invention, and they are not used to limit the protection scope of the present invention. Any equivalent implementation manners or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A longitudinally-mounted hybrid power split transmission with dual motors and dual planetary rows, comprising a housing, an auxiliary motor (41), a drive motor (51), an input shaft (1) and an output shaft (2). One end of the input shaft (1) is connected to an engine (11), and the auxiliary motor shaft (4) of the auxiliary motor (41) is sleeved on the input shaft (1) loosely; the drive motor shaft (5) of the drive motor (51) is sleeved on the output shaft (2) loosely. It is characterized in that: A dual planetary row (3) is provided between the drive motor (51) and the auxiliary motor (41). The dual planetary row (3) at least includes a left planetary carrier (31), a left sun gear (32), a right planetary carrier (37), a right sun gear (34) and an external gear ring (33). The left planetary carrier (31) is fixedly arranged at the other end of the input shaft (1), the left sun gear (32) is fixedly arranged on the auxiliary motor shaft (4), the right sun gear (34) is fixedly arranged on the drive motor shaft (5), and the external gear ring (33) is fixedly arranged on the output shaft (2). It further includes a dual brake (6). The dual brake (6) includes a dual brake disc (61) fixedly arranged in the housing. On both sides of the dual brake disc (61), a dual brake first driven disc (62) and a dual brake second driven disc (63) which can be combined with or separated from it are respectively provided. The dual brake first driven disc (62) is fixedly arranged on the auxiliary motor shaft (4), and the dual brake second driven disc (63) is fixedly connected to the left planetary carrier (31). A left planetary gear (35) is provided between the left sun gear (32) and the external gear ring (33). The left planetary gear (35) is pivotally arranged on the left planetary carrier (31); a right planetary gear (36) is provided between the right sun gear (34) and the external gear ring (33). The right planetary gear (36) is pivotally arranged on the right planetary carrier (37), and the right planetary carrier (37) is fixedly arranged on the housing. A single brake (7) is fixedly arranged on the external gear ring (33). The single brake (7) includes a single brake disc (71) fixedly arranged in the housing. The single brake disc (71) is combined with or separated from a single brake driven disc (72) arranged on one side of it, and the single brake driven disc (72) is fixedly connected to the external gear ring (33). The dual brake (6) is a wet mechanical clutch.

2. The longitudinally-mounted hybrid power split transmission with dual motors and dual planetary rows according to claim 1, It is characterized in that: The input shaft (1) and the output shaft (2) are coaxially arranged, and the output shaft (2) is sleeved on the input shaft (1) loosely.

3. The longitudinally-mounted hybrid power split transmission with dual motors and dual planetary rows according to claim 2, It is characterized in that: A shock-absorbing disc (12) is further fixedly arranged on the input shaft (1), and the shock-absorbing disc (12) is located between the engine (11) and the auxiliary motor (41).

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