CN115875414B

CN115875414B - A multi-gear dual-mode hybrid transmission

Info

Publication number: CN115875414B
Application number: CN202211457643.XA
Authority: CN
Inventors: 丁华锋; 耿梅杰; 柯涛
Original assignee: China University of Geosciences Wuhan
Current assignee: China University of Geosciences Wuhan
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2025-05-30
Anticipated expiration: 2042-11-18
Also published as: CN115875414A

Abstract

The present invention provides a multi-gear dual-mode hybrid transmission, comprising a transmission housing and an input shaft, a generator, an electric motor, a connecting output shaft, a planetary gear row group, a connecting component group and a torque transmission device installed inside the transmission housing, wherein the planetary gear row group comprises a first planetary gear row, a second planetary gear row and a third planetary gear row. The torque transmission device can be selectively engaged in a combination of three, and then a multi-gear speed ratio is established between the input shaft and the output shaft by connecting the engine, the generator and the electric motor, wherein the forward gear comprises a pure electric gear, an input split gear, a compound split gear, a reduction gear, a direct gear and an overdrive gear. The multi-gear dual-mode hybrid transmission provided by the present invention adopts a planetary gear train structure for transmission, and the three planetary gear rows can construct a multi-gear speed ratio, with a compact structure and less energy loss during transmission.

Description

Multi-gear double-mode hybrid transmission

Technical Field

The invention relates to the technical field of automobile transmission, in particular to a multi-gear double-mode hybrid transmission.

Background

In recent years, sustainable health development of the global automotive industry has faced significant challenges due to the scarcity of fossil fuels and stricter carbon emission regulations. The power split hybrid transmission is a core component of a power split hybrid vehicle that can improve the efficiency and performance of a vehicle hybrid system, and is considered as one of effective methods for alleviating energy shortage and reducing pollution.

The dual-mode power split hybrid transmission is currently in the explosive development stage, and the current hybrid transmission is single in structure, few in gear and working mode, low in fuel saving efficiency, complex in control, high in comprehensive cost and often applied to high-end vehicle types. Therefore, it is necessary to design a new multi-speed dual-mode hybrid transmission.

Disclosure of Invention

In view of the above, the present invention provides a multi-gear dual mode hybrid transmission including a transmission housing, an engine and its input shaft mounted within the transmission housing, a generator, an electric motor, a connecting output shaft, a planetary gear set, a coupling member set and a torque transmitting device,

The input shaft is connected with the engine;

The planetary gear set comprises a first planetary gear set, a second planetary gear set and a third planetary gear set which are sequentially arranged from front to back, the torque transmission device comprises a first clutch, a second clutch, a first brake and a second brake, and the first brake and the second brake are fixedly connected with a transmission shell;

the first planetary gear row consists of a first gear ring, a first planetary gear, a first planet carrier and a first sun gear, wherein the first sun gear and the first planetary gear are in external engagement transmission, the first planetary gear and the first gear ring are in internal engagement transmission, and the first planetary gear is rotatably supported on the first planet carrier;

The second planetary gear row consists of a second gear ring, a second planetary gear, a second planet carrier and a second sun gear, wherein the second sun gear and the second planetary gear are in external engagement transmission, the second planetary gear and the second gear ring are in internal engagement transmission, and the second planetary gear is rotatably supported on the second planet carrier;

The third planetary gear row consists of a third gear ring, a third planetary gear, a third planetary carrier and a third sun gear, wherein the third sun gear and the third planetary gear are in external engaged transmission, the third planetary gear and the third gear ring are in internal engaged transmission, and the third planetary gear is rotatably supported on the third planetary carrier;

The coupling member group includes a first coupling member, a second coupling member, a third coupling member, a fourth coupling member;

The first coupling member interconnecting the first ring gear and the second carrier, the second coupling member interconnecting the second clutch and the second sun gear, the third coupling member interconnecting the second sun gear and the third sun gear, and the fourth coupling member interconnecting the second ring gear and the third carrier;

the first brake interconnecting the third ring gear with the transmission housing, and the second brake interconnecting the first sun gear with the transmission housing;

the first clutch interconnecting a fourth coupling member with a third carrier; the second clutch interconnects the first ring gear with the first carrier;

the first clutch, the second clutch, the first brake, and the second brake are selectively engaged to cooperate with different modes of operation of the engine, the generator, and the motor to establish a multi-gear transmission mode between the input shaft and the output shaft.

Further, the transmission is characterized in that the working modes of the transmission comprise a pure electric mode, a hybrid power mode and a pure fuel mode;

Wherein the pure electric mode is as follows:

the electric motor is activated, the first brake is engaged, the transmission enters a pure electric mode, and the output shaft is driven in pure electric.

The hybrid power mode comprises an input split-flow working mode and a compound split-flow working mode;

The input split-flow working mode is that an engine is started, a generator is started, a motor is started, a first brake is engaged, a transmission enters the input split-flow working mode, and an output shaft is driven by mixed power;

the engine is started, the generator is started, the motor is started, the first clutch is engaged, the transmission enters the compound split-flow working mode, and the output shaft is driven by mixed power;

The pure fuel mode comprises a first gear working mode, a second gear working mode and a third gear working mode,

The first gear working mode is that the engine is started, and a first clutch and a first brake are engaged to establish a first gear transmission ratio between the input shaft and the output shaft;

The second gear working mode is that the engine is started, and a second gear transmission ratio is established between the input shaft and the output shaft by engaging the first clutch and the second clutch;

the three-gear working mode is that the engine is started, and the second brake and the first clutch are engaged to establish a three-gear transmission ratio between the input shaft and the output shaft.

The technical scheme provided by the invention has the beneficial effects that:

1. The multi-gear dual-mode hybrid transmission provided by the invention can work in a fuel drive mode, an electric drive mode and a hybrid drive mode respectively, can effectively reduce fuel consumption in the running process, reduce vehicle emission and reduce pollution.

2. The mechanism part of the multi-gear dual-mode hybrid transmission provided by the invention adopts planetary gear train transmission, the three planetary gear rows have compact structure, and a single planetary gear or a double planetary gear can be adopted, so that the manufacturing process is mature;

3. the multi-gear double-mode hybrid transmission provided by the invention only adopts four control elements, namely two clutches and two brakes, and only one control element is needed to be replaced in the process of switching to the next gear, so that the control is simpler.

Drawings

FIG. 1 is a schematic illustration of a multi-range, two-mode, hybrid transmission of the present invention.

The transmission is characterized by comprising 1-input shafts, 2-output shafts, 3-generators, 4-motors, 5-transmission housings, 6-first gear rings, 7-first planetary gears, 8-first planetary carriers, 9-first sun gears, 10-second gear rings, 11-second planetary gears, 12-second planetary carriers, 13-second sun gears, 14-third gear rings, 15-third planetary carriers, 16-third planetary gears, 17-third sun gears, 18-first coupling members, 19-second coupling members, 20-third coupling members, 21-fourth coupling members, B1-first brakes, B2-second brakes, C1-first clutches and C2-clutches.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides a multi-gear dual-mode hybrid transmission, which includes a transmission housing, an input shaft 1, an output shaft 2, three planetary gear rows, two brakes, two clutches and four coupling members disposed in the transmission housing 5, wherein the three planetary gear rows are a first planetary gear row, a second planetary gear row and a third planetary gear row, the two brakes are a first brake B1 and a second brake B2, the four coupling members are a first coupling member 18, a second coupling member 19, a third coupling member 20 and a fourth coupling member 21, and the two clutches are a first clutch C1 and a second clutch C1.

The first brake B1 and the second brake B2 are fixedly connected with a transmission shell 5, and the input shaft 1 is connected with an engine;

the three planetary gear rows are all located in the transmission housing 5, wherein the first planetary gear row comprises a first gear ring 6, a first planetary gear 7, a first planet carrier 8 and a first sun gear 9, the first sun gear 9 and the first planetary gear 7 are in external engagement transmission, the first planetary gear 7 and the first gear ring are in internal engagement transmission, and the first planetary gear 7 is rotatably supported on the first planet carrier 8.

The second planetary gear row comprises a second gear ring 10, second planetary gears 11, a second planet carrier 12 and a second sun gear 13, wherein the second sun gear 13 and the second planetary gears 11 are in external engagement transmission, the second planetary gears 11 and the second gear ring 10 are in internal engagement transmission, and the second planetary gears 11 are rotatably supported on the second planet carrier 12.

The third planetary gear row comprises a third gear ring 14, a third planetary gear 16, a third planet carrier 15 and a third sun gear 17, the third sun gear 17 and the third planetary gear 16 are in external engagement transmission, the third planetary gear 16 and the third gear ring 14 are in internal engagement transmission, and the third planetary gear 16 is rotatably supported on the third planet carrier 15.

A first coupling member 18 interconnecting the first ring gear 6 and the second planet carrier 12, a second coupling member 19 interconnecting the second clutch C2 and the second sun gear 13, a third coupling member 20 interconnecting the second sun gear and the third sun gear, and a fourth coupling member 21 interconnecting the second ring gear 10 and the third planet carrier 15;

A first brake B1 interconnects the third ring gear 14 with the transmission housing 5, and a second brake B2 interconnects the first sun gear 9 with the transmission housing 5;

the first clutch C1 interconnects the fourth coupling member 21 with the third carrier 15, the second clutch C2 interconnects the first ring gear 6 with the first carrier 8;

The specific implementation process is as follows:

In the pure electric mode, by engaging the first brake B1, the motor 4 is started, the third ring gear 14 is connected to the transmission case 5 by the first brake B1, rotation of the third ring gear 14 is prevented, power is transmitted from the motor 4 directly to the output shaft 2 through engagement of the third planetary gear (16) with the third sun gear 17, and thus, only the motor 4 serves as a power input source, and the transmission is in the pure electric mode at this time.

The input split mode is that by engaging the first brake B1, the engine, the generator 3, and the motor 4 are started, the third ring gear 14 is connected to the transmission housing 5 by the first brake B1, rotation of the third ring gear 14 is prevented, at this time, the engine drives the first ring gear 6 to rotate, further drives the first sun gear 8 to rotate by the first planet gears 7, the generator 3 converts mechanical energy into electric energy to supply power to an external battery, the motor 4 is used as a main power input source to drive the vehicle, and engine power mainly supplies power to the generator 3, thereby supplying power to the input split mode.

Compound split mode-by engaging the first brake B1 and the first clutch C1, the engine, the generator 3, and the motor 4, the third ring gear 14 is connected to the transmission case 5 by the first brake B1, rotation of the third ring gear 14 is prevented, the second ring gear 10 and the third carrier 15 are connected, at this time, the engine and the motor 4 drive the vehicle as power input sources, the generator 3 simultaneously charges the external battery, a part of the engine power energizes the generator 3, and a part participates in driving the vehicle, thereby being the compound split mode.

Pure fuel gear one by engaging the first brake B1 and the first clutch C1, the engine starts, the third ring gear 14 is connected to the transmission case 5 by the first brake B1, rotation of the third ring gear 14 is prevented, the second ring gear 10 and the third carrier 15 are connected, and a first gear ratio is established between the input shaft 1 and the output shaft 2.

In the second pure fuel gear, by engaging the first clutch C1 and the second clutch C2, the engine is started, the second gear ring 10 is connected with the third planet carrier 15, the first gear ring 6, the first planet gears 7, the second planet gears 11 and the second sun gear 13 rotate at the same speed, and a second gear transmission ratio, namely a direct gear, is established between the input shaft 1 and the output shaft 2.

Pure fuel gear three by engaging the first clutch C1 and the second brake B2, the engine starts, the first sun gear 9 is connected to the transmission housing 5 by the second brake B2, rotation of the first sun gear 9 is prevented, the second ring gear 10 is connected to the third carrier 15, a three-gear transmission ratio is established between the input shaft 1 and the output shaft 2,

The operating logic table of the first clutch C1, the second clutch C2, the first brake B1 and the second brake B2 is shown in table 1:

TABLE 1 working logic table

In the present embodiment, the first clutch C1 and the second clutch C2 are a multiplate wet clutch or a dog clutch, and the first brake B1 and the second brake B2 are drum brakes or multiplate wet brakes.

In this document, terms such as front, rear, upper, lower, etc. are defined with respect to the positions of the components in the drawings and with respect to each other, for clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the claimed application.

The embodiments described above and features of the embodiments herein may be combined with each other without conflict.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

1. A multi-speed dual-mode hybrid transmission, characterized in that it comprises a transmission housing and an input shaft (1) installed inside the transmission housing, a generator (3), an electric motor (4), a connecting output shaft (2), a planetary gear set, a coupling member set and a torque transmission device,

The input shaft (1) is connected to the engine;

The planetary gear set comprises a first planetary gear set, a second planetary gear set and a third planetary gear set which are sequentially installed from front to back; the torque transmission device comprises a first clutch (C1), a second clutch (C2), a first brake (B1) and a second brake (B2); the first brake (B1) and the second brake (B2) are both fixedly connected to a transmission housing (5);

The first planetary gear row is composed of a first ring gear (6), a first planetary wheel (7), a first planet carrier (8) and a first sun wheel (9); the first sun wheel (9) and the first planetary wheel (7) are externally meshed for transmission, the first planetary wheel (7) and the first ring gear (6) are internally meshed for transmission, and the first planetary wheel (7) is rotatably supported on the first planet carrier (8);

The second planetary gear row is composed of a second ring gear (10), a second planetary gear (11), a second planet carrier (12) and a second sun gear (13); the second sun gear (13) and the second planetary gear (11) are externally meshed for transmission, the second planetary gear (11) and the second ring gear (10) are internally meshed for transmission, and the second planetary gear (11) is rotatably supported on the second planet carrier (12);

The third planetary gear row is composed of a third ring gear (14), a third planetary gear (16), a third planet carrier (15) and a third sun gear (17); the third sun gear (17) and the third planetary gear (16) are externally meshed for transmission, the third planetary gear (16) and the third ring gear (14) are internally meshed for transmission, and the third planetary gear (16) is rotatably supported on the third planet carrier (15);

The connecting member group comprises a first connecting member (18), a second connecting member (19), a third connecting member (20), and a fourth connecting member (21);

The first connecting member (18) interconnects the first ring gear (6) and the second planet carrier (12), the second connecting member (19) interconnects the second clutch (C2) and the second sun gear (13), the third connecting member (20) interconnects the second sun gear and the third sun gear, and the fourth connecting member (21) interconnects the second ring gear (10) and the third planet carrier (15);

The first brake (B1) interconnects the third ring gear (14) with the transmission housing (5), and the second brake (B2) interconnects the first sun gear (9) with the transmission housing (5);

The first clutch (C1) interconnects the fourth connecting member (21) and the third planet carrier (15); the second clutch (C2) interconnects the first ring gear (6) and the first planet carrier (8);

The input shaft (1) is connected to the first ring gear (6), the generator (3) is connected to the first sun gear (9), and the motor (4) is connected to the third sun gear (17);

The first clutch (C1), the second clutch (C2), the first brake (B1), and the second brake (B2) are selectively engaged to cooperate with different working modes of the engine, the generator (3), and the motor (4) to establish a multi-gear transmission mode between the input shaft (1) and the output shaft (2).

2. The multi-speed dual-mode hybrid transmission according to claim 1, characterized in that: the operating modes of the transmission include: a pure electric operating mode;

The pure electric working mode is:

The electric motor (4) is started, the first brake (B1) is engaged, the transmission enters a pure electric working state, and the output shaft (2) is driven purely electrically.

3. The multi-speed dual-mode hybrid transmission according to claim 2, characterized in that: the operating mode of the transmission further includes a hybrid power mode, and the hybrid power mode includes an input split operating mode and a compound split operating mode;

The input split working mode is: the engine is started, the generator (3) is started, the motor (4) is started, the first brake (B1) is engaged, the transmission enters the input split working state, and the output shaft (2) is driven with hybrid power;

Compound split working mode: the engine is started, the generator (3) is started, the motor (4) is started, the first clutch (C1) is engaged, the transmission enters the compound split working state, and the output shaft (2) is driven with mixed power.

4. The multi-speed dual-mode hybrid transmission according to claim 2, characterized in that: the operating mode of the transmission also includes a pure fuel mode;

The pure fuel mode includes a first gear working mode, a second gear working mode and a third gear working mode.

The first gear working mode is as follows: the engine is started, and the first clutch (C1) and the first brake (B1) are engaged to establish a first gear transmission ratio between the input shaft and the output shaft;

The second gear working mode is: the engine is started, and the first clutch (C1) and the second clutch (C2) are engaged to establish a second gear ratio between the input shaft and the output shaft;

The third gear working mode is: the engine is started, and the second brake (B2) and the first clutch (C1) are engaged to establish a third gear ratio between the input shaft and the output shaft.