A multi-gear dual-mode hybrid transmission

Abstract

The present invention provides a multi-gear dual-mode hybrid transmission, which includes a transmission housing and an input shaft, a generator, a motor, a connecting output shaft, a planetary gear train set, a coupling member set and a torque transmission device installed inside the transmission housing. The planetary gear train set includes a first planetary gear train, a second planetary gear train and a third planetary gear train. Among them, the torque transmission device can be selectively engaged in three combined forms, 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 motor. The forward gears include 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. The three planetary gear trains can construct a multi-gear speed ratio, with a compact structure and less energy loss during the transmission process.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive transmissions, and particularly to a multi-gear dual-mode hybrid transmission. Background Art

[0002] In recent years, due to the scarcity of fossil fuels and more stringent carbon emission regulations, the sustainable and healthy development of the global automotive industry has faced huge challenges. The power-split hybrid transmission is the core component of a power-split hybrid vehicle, which can improve the efficiency and performance of the vehicle's hybrid system and is considered one of the effective methods to alleviate energy shortages and reduce pollution.

[0003] The dual-mode power-split hybrid transmission is currently in a booming development stage. The current hybrid transmissions have a single structure, few gears and working modes, low fuel-saving efficiency, complex control, and relatively high comprehensive costs, and are often applied to high-end models. Therefore, it is very necessary to design a new multi-gear dual-mode hybrid transmission. Summary of the Invention

[0004] In view of this, the present invention provides a multi-gear dual-mode hybrid transmission, including a transmission housing and an engine and its input shaft, a generator, a motor, a connecting output shaft, a planetary gear train group, a coupling member group, and a torque transmission device installed inside the transmission housing.

[0005] The input shaft is connected to the engine.

[0006] The planetary gear train group includes a first planetary gear train, a second planetary gear train, and a third planetary gear train installed in sequence from front to back. The torque transmission device includes a first clutch, a second clutch, a first brake, and a second brake, and both the first brake and the second brake are fixedly connected to the transmission housing.

[0007] The first planetary gear train is composed of a first ring gear, a first planetary gear, a first planetary carrier, and a first sun gear. The first sun gear and the first planetary gear are in external meshing transmission, the first planetary gear and the first ring gear are in internal meshing transmission, and the first planetary gear is rotatably supported on the first planetary carrier.

[0008] The second planetary gear train is composed of a second ring gear, a second planetary gear, a second planetary carrier, and a second sun gear. The second sun gear and the second planetary gear are in external meshing transmission, the second planetary gear and the second ring gear are in internal meshing transmission, and the second planetary gear is rotatably supported on the second planetary carrier.

[0009] The third planetary gear train is composed of a third ring gear, a third planetary gear, a third planetary carrier, and a third sun gear. The third sun gear and the third planetary gear are in external meshing transmission, the third planetary gear and the third ring gear are in internal meshing transmission, and the third planetary gear is rotatably supported on the third planetary carrier.

[0010] The coupling member group includes a first coupling member, a second coupling member, a third coupling member, and a fourth coupling member;

[0011] The first coupling member interconnects the first ring gear and the second planet carrier, the second coupling member interconnects the second clutch and the second sun gear, the third coupling member interconnects the second sun gear and the third sun gear, and the fourth coupling member interconnects the second ring gear and the third planet carrier;

[0012] The first brake interconnects the third ring gear and the transmission housing, and the second brake interconnects the first sun gear and the transmission housing;

[0013] The first clutch interconnects the fourth coupling member and the third planet carrier; the second clutch interconnects the first ring gear and the first planet carrier;

[0014] The first clutch, the second clutch, the first brake, and the second brake selectively engage to cooperate with different working modes of the engine, the generator, and the motor to establish a multi-gear transmission mode between the input shaft and the output shaft.

[0015] Furthermore, it is characterized in that: the working modes of the transmission include: pure electric mode, hybrid mode, and pure fuel mode;

[0016] Among them, the pure electric mode is:

[0017] The motor starts, the first brake is engaged, and the transmission enters the pure electric working mode, and the output shaft is driven by pure electricity.

[0018] The hybrid mode includes an input split working mode and a compound split working mode;

[0019] Among them, the input split working mode is: the engine starts, the generator starts, the motor starts, the first brake is engaged, and the transmission enters the input split working mode, and the output shaft is driven by hybrid power;

[0020] Compound split working mode; the engine starts, the generator starts, the motor starts, the first clutch is engaged, and the transmission enters the compound split working mode, and the output shaft is driven by hybrid power;

[0021] The pure fuel mode includes a first gear working mode, a second gear working mode, and a third gear working mode,

[0022] Among them, the first gear working mode is: the engine starts, and by engaging the first clutch and the first brake, a first gear transmission ratio is established between the input shaft and the output shaft;

[0023] The second gear working mode is as follows: The engine starts, and by engaging the first clutch and the second clutch, a second gear transmission ratio is established between the input shaft and the output shaft.

[0024] The third gear working mode is as follows: The engine starts, and by engaging the second brake and the first clutch, a third gear transmission ratio is established between the input shaft and the output shaft.

[0025] The beneficial effects brought by the technical solution provided by the present invention are as follows:

[0026] 1. The multi-gear dual-mode hybrid transmission provided by the present invention can work in fuel drive, electric drive, and hybrid drive modes respectively, effectively reducing fuel consumption, vehicle emissions, and pollution during operation.

[0027] 2. The mechanism part of the multi-gear dual-mode hybrid transmission provided by the present invention adopts a planetary gear train transmission. The three planetary gear sets are compact in structure, and single planetary gears or double planetary gears can be used, and the manufacturing process is mature.

[0028] 3. The multi-gear dual-mode hybrid transmission provided by the present invention only uses four control elements, namely two clutches and two brakes. Only one control element needs to be replaced during the process of switching to the next gear, so the control is simpler. Description of the Drawings

[0029] Figure 1 It is a structural schematic diagram of a multi-gear dual-mode hybrid transmission of the present invention.

[0030] In the figure: 1 - input shaft, 2 - output shaft, 3 - generator, 4 - motor, 5 - transmission housing, 6 - first ring gear, 7 - first planetary gear, 8 - first planet carrier, 9 - first sun gear, 10 - second ring gear, 11 - second planetary gear, 12 - second planet carrier, 13 - second sun gear, 14 - third ring gear, 15 - third planet carrier, 16 - third planetary gear, 17 - third sun gear, 18 - first connecting member, 19 - second connecting member, 20 - third connecting member, 21 - fourth connecting member, B1 - first brake, B2 - second brake, C1 - first clutch, C2 - clutch. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] Please refer to Figure 1, embodiments of the present invention provide a multi-gear dual-mode hybrid transmission, including a transmission housing and an input shaft 1, an output shaft 2, three planetary gear sets, two brakes, two clutches, and four connecting members disposed within the transmission housing 5. Among them, the three planetary gear sets are respectively the first planetary gear set, the second planetary gear set, and the third planetary gear set; the two brakes are respectively the first brake B1 and the second brake B2; the four connecting members are respectively the first connecting member 18, the second connecting member 19, the third connecting member 20, and the fourth connecting member 21, and the two clutches are respectively: the first clutch C1 and the second clutch C1.

[0033] Both the first brake B1 and the second brake B2 are fixedly connected to the transmission housing 5; the input shaft 1 is connected to the engine;

[0034] All three planetary gear sets are located within the transmission housing 5. Among them, the first planetary gear set includes a first ring gear 6, a first planet gear 7, a first planet carrier 8, and a first sun gear 9. The first sun gear 9 and the first planet gear 7 are in external meshing transmission, the first planet gear 7 and the first ring gear 6 are in internal meshing transmission, and the first planet gear 7 is rotatably supported on the first planet carrier 8.

[0035] The second planetary gear set includes a second ring gear 10, a second planet gear 11, a second planet carrier 12, and a second sun gear 13. The second sun gear 13 and the second planet gear 11 are in external meshing transmission, the second planet gear 11 and the second ring gear 10 are in internal meshing transmission, and the second planet gear 11 is rotatably supported on the second planet carrier 12.

[0036] The third planetary gear set includes a third ring gear 14, a third planet gear 16, a third planet carrier 15, and a third sun gear 17. The third sun gear 17 and the third planet gear 16 are in external meshing transmission, the third planet gear 16 and the third ring gear 14 are in internal meshing transmission, and the third planet gear 16 is rotatably supported on the third planet carrier 15.

[0037] 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;

[0038] The first brake B1 interconnects the third ring gear 14 and the transmission housing 5, and the second brake B2 interconnects the first sun gear 9 and the transmission housing 5;

[0039] 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;

[0040] The specific implementation process is as follows:

[0041] Pure electric mode: By engaging the first brake B1, the motor 4 starts. The third ring gear 14 is connected to the transmission housing 5 by the first brake B1, preventing the rotation of the third ring gear 14. Through the engagement of the third planet gear (16) with the third sun gear 17, the power is directly transmitted from the motor 4 to the output shaft 2. Thus, only the motor 4 serves as the power input source, and the transmission is in pure electric mode at this time.

[0042] Input split mode: By engaging the first brake B1, the engine, the generator 3, and the motor 4 start. The third ring gear 14 is connected to the transmission housing 5 by the first brake B1, preventing the rotation of the third ring gear 14. At this time, the engine drives the first ring gear 6 to rotate, and further drives the first sun gear 8 to rotate through the first planet gear 7. The generator 3 converts mechanical energy into electrical energy to supply power to the external battery. The motor 4 serves as the main power input source to drive the vehicle, and the engine power mainly supplies energy to the generator 3. Thus, it is the input split mode.

[0043] Compound split mode: By engaging the first brake B1 and the first clutch C1, the engine, the generator 3, and the motor 4 start. The third ring gear 14 is connected to the transmission housing 5 by the first brake B1, preventing the rotation of the third ring gear 14. The second ring gear 10 and the third planet carrier 15 are connected. At this time, the engine and the motor 4 serve as power input sources to drive the vehicle, and the generator 3 simultaneously charges the external battery. Part of the engine power supplies energy to the generator 3, and part participates in driving the vehicle. Thus, it is the compound split mode.

[0044] 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 housing 5 by the first brake B1, preventing the rotation of the third ring gear 14. The second ring gear 10 and the third planet carrier 15 are connected, and a first gear transmission ratio is established between the input shaft 1 and the output shaft 2.

[0045] Pure fuel gear two: By engaging the first clutch C1 and the second clutch C2, the engine starts. The second ring gear 10 and the third planet carrier 15 are connected, and the first ring gear 6, the first planet gear 7, the second planet gear 11, and the second sun gear 13 rotate at the same speed, establishing a second gear transmission ratio, that is, a direct gear, between the input shaft 1 and the output shaft 2.

[0046] 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, preventing the rotation of the first sun gear 9. The second ring gear 10 and the third planet carrier 15 are connected, and a third gear transmission ratio is established between the input shaft 1 and the output shaft 2.

[0047] Among them, the working logic tables of the first clutch C1, the second clutch C2, the first brake B1, and the second brake B2 are shown in Table 1 as follows:

[0048] Table 1: Working Logic Table

[0049]

[0050] In this embodiment, the first clutch C1 and the second clutch C2 are multi-disc wet clutches or jaw clutches, and the first brake B1 and the second brake B2 are drum brakes or multi-disc wet brakes.

[0051] In this article, the orientation terms such as front, rear, upper, and lower are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the orientation terms should not limit the scope of protection claimed in this application.

[0052] Without conflict, the above embodiments and the features in the embodiments in this article can be combined with each other.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-gear dual-mode hybrid transmission, characterized in that, it includes a transmission housing and an input shaft (1), a generator (3), a motor (4), a connecting output shaft (2), a planetary gear train group, a connecting member group and a torque transmission device installed inside the transmission housing; the input shaft (1) is connected to the engine; the planetary gear train group includes a first planetary gear train, a second planetary gear train, and a third planetary gear train installed in sequence from front to back. The torque transmission device includes a first clutch (C1), a second clutch (C2), a first brake (B1), and a second brake (B2). Both the first brake (B1) and the second brake (B2) are fixedly connected to the transmission housing (5); the first planetary gear train is composed of a first ring gear (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 meshing transmission. The first planetary gear (7) and the first ring gear (6) are in internal meshing transmission. The first planetary gear (7) is rotatably supported on the first planet carrier (8); the second planetary gear train 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 in external meshing transmission. The second planetary gear (11) and the second ring gear (10) are in internal meshing transmission. The second planetary gear (11) is rotatably supported on the second planet carrier (12); the third planetary gear train 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 in external meshing transmission. The third planetary gear (16) and the third ring gear (14) are in internal meshing transmission. The third planetary gear (16) is rotatably supported on the third planet carrier (15); the connecting member group includes 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. 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) and the transmission housing (5). The second brake (B2) interconnects the first sun gear (9) and 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 operating 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-gear dual-mode hybrid transmission according to claim 1, characterized in that: The operating modes of the transmission include: pure electric operating mode; The pure electric operating mode is: The motor (4) starts, the first brake (B1) is engaged, the transmission enters the pure electric operating state, and the output shaft (2) is driven purely electrically.

3. The multi-gear dual-mode hybrid transmission according to claim 2, characterized in that: The operating modes of the transmission further include a hybrid power mode, and the hybrid power mode includes an input split operating mode and a compound split operating mode; Among them, the input split operating mode is: the engine starts, the generator (3) starts, the motor (4) starts, the first brake (B1) is engaged, the transmission enters the input split operating state, and the output shaft (2) is driven with hybrid power; Compound split operating mode; the engine starts, the generator (3) starts, the motor (4) starts, the first clutch (C1) is engaged, the transmission enters the compound split operating state, and the output shaft (2) is driven with hybrid power.

4. The multi-gear dual-mode hybrid transmission according to claim 2, characterized in that: The operating modes of the transmission further include a pure fuel mode; The pure fuel mode includes a first-gear operating mode, a second-gear operating mode, and a third-gear operating mode, Among them, the first-gear operating mode is: the engine starts, and by engaging the first clutch (C1) and the first brake (B1), a first-gear transmission ratio is established between the input shaft and the output shaft; The second-gear operating mode is: the engine starts, and by engaging the first clutch (C1) and the second clutch (C2), a second-gear transmission ratio is established between the input shaft and the output shaft; The third-gear operating mode is: the engine starts, and by engaging the second brake (B2) and the first clutch (C1), a third-gear transmission ratio is established between the input shaft and the output shaft.

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