A dual-motor two-speed hybrid transmission

Abstract

The present invention discloses a dual-motor two-speed hybrid transmission, comprising an engine, a main drive motor, a planetary gear, a ring gear brake, a speed gear set, a differential, a clutch I and a clutch II. The planetary gear comprises a sun gear, a planetary carrier and an outer ring gear. The planetary carrier is provided with planetary gears meshing with the sun gear, and the outer ring gear is meshing with the planetary gears. A sun gear input shaft is provided on the sun gear. The engine output end and the sun gear input shaft are driven by clutch I, and the sun gear input shaft and the outer ring gear are driven by clutch II. A ring gear brake is provided on the outer side of the outer ring gear, and the ring gear brake can lock the outer ring gear. The planetary carrier is in driving connection with the input end of the speed gear set, and the output end of the speed gear set is provided with the speed gear set output shaft. A main drive motor reduction gear is provided between the output end of the main drive motor and the output shaft of the speed gear set and is in driving connection therewith. The output shaft of the speed gear set is in driving connection with the input end of the differential.

Description

Technical Field

[0001] The present invention relates to the field of new energy hybrid drive technology, and in particular to a dual-motor two-speed hybrid transmission. Background Art

[0002] Faced with the rapid development of the automotive industry and the performance drawbacks of pure electric vehicles, hybrid vehicles, as a transitional vehicle from traditional fuel vehicles to new energy vehicles, are highly anticipated. Existing hybrid transmissions each have their own shortcomings. Some have complex structures leading to high production costs, others have design flaws resulting in poor integration and bulk, and some have inflexible power transmission and poor fuel efficiency. When hybrid production volumes are low, extended transmissions are a more economical option. However, as hybrid production volumes and hybridization levels increase, hybrid-specific transmissions will demonstrate cost and performance advantages. Therefore, there is an urgent need to design a hybrid-specific transmission with superior overall performance that meets the requirements of low cost, lightweight design, and flexible power transmission. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a dual-motor two-speed hybrid transmission with low cost, compact structure, smooth shifting and flexible transmission.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A dual-motor two-speed hybrid transmission comprises an engine, a main drive motor, a planetary gear, a ring gear brake, a speed gear set, a differential, a clutch I and a clutch II. The planetary gear comprises a sun gear, a planetary carrier and an outer ring gear which are arranged on the same center line from the inside outward. The planetary carrier is provided with planetary gears which mesh with the sun gear, and the outer ring gear is engaged with the planetary gears. A sun gear input shaft is provided on the sun gear. The output end of the engine is connected to the sun gear input shaft via clutch I, and the sun gear input shaft is connected to the outer ring gear via clutch II. A ring gear brake is provided on the outer side of the outer ring gear. The ring gear brake is in a fixed state and can lock the outer ring gear. The planetary carrier is connected to the input end of the speed gear set, and the output end of the speed gear set is provided with the speed gear set output shaft. A main drive motor reduction gear is provided between the output end of the main drive motor and the output shaft of the speed gear set and is connected via the main drive motor reduction gear. The output shaft of the speed gear set is connected to the input end of the differential.

[0006] As an optimization, the dual-motor two-speed hybrid transmission also includes an auxiliary drive motor, and an auxiliary drive motor reduction gear is provided between the output end of the auxiliary drive motor and clutch I and is connected through the auxiliary drive motor reduction gear.

[0007] As an optimization, the clutch I and the clutch II are each a dry clutch or a wet clutch.

[0008] As an optimization, there are multiple ring gear brakes and they are evenly spaced around the center line of the outer ring gear.

[0009] The first gear of the transmission is achieved by disengaging clutch II, engaging the ring gear brake, and locking the outer ring gear. Power is transferred from the sun gear to the planetary carrier, forming a fixed transmission ratio between the sun gear and the planetary carrier, with a transmission ratio greater than 1. The second gear of the transmission is achieved by engaging clutch II, disengaging the ring gear brake, and transmitting power to the sun gear and the outer ring gear. Power is directly transferred from the planetary gear set, and the planetary gear set rotates as a whole, with a transmission ratio equal to 1. Due to the presence of the speed gear set, the transmission ratio of the gear position can be flexibly designed by adjusting the transmission ratio between the speed gear set, the sun gear, and the planetary carrier. In the present invention, the power transmission flow is from the main drive motor to the output shaft of the speed gear set. At the same time, due to the presence of the planetary gear set, the combined force of the engine and the auxiliary drive motor is also transmitted to the output shaft of the speed gear set through the planetary carrier, so that there is no significant impact in power switching and no power interruption during gear shifting, making the transmission process smooth and stable.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] (1) The present invention has a simple structural design and is easy to manufacture;

[0012] (2) The present invention adopts dual motor drive, which expands the high efficiency area of ​​the system, thereby improving the overall working efficiency and increasing the cruising range;

[0013] (3) The present invention adopts a planetary gearbox as a shifting mechanism, which can achieve a smooth shifting effect and solve the problem of power interruption during the shifting process of ordinary hybrid power transmissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 Schematic diagram of two-speed power transmission in pure electric drive mode of the present invention;

[0016] Figure 3 This is a schematic diagram of two-speed power transmission in the engine direct drive mode of the present invention;

[0017] Figure 4 A schematic diagram of two-speed power transmission in a hybrid drive mode of the present invention;

[0018] Figure 5 This is a schematic diagram of two-speed power transmission in the driving charging mode of the present invention;

[0019] Figure 6 This is a schematic diagram of two-speed power transmission in the parking power generation mode of the present invention;

[0020] Figure 7 Schematic diagram of two-speed power transmission in energy recovery mode of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, a dual-motor two-speed hybrid transmission in this specific embodiment includes an engine 1, a main drive motor 2, a planetary gear, a ring gear brake 3, a speed gear set 4, a differential 5, a clutch I 6 and a clutch II 7. The planetary gear includes a sun gear 8, a planetary carrier 9 and an outer ring gear 10 arranged on the same center line from the inside to the outside. The planetary carrier 9 is equipped with planetary gears that mesh with the sun gear 8, and the outer ring gear 10 is engaged with the planetary gears; a sun gear input shaft 11 is installed on the sun gear 8, and the engine output end and the sun gear input shaft 11 are connected through the clutch I 6. The sun gear input shaft 1 1 is connected to the outer ring gear 10 through a clutch II 7. A ring gear brake 3 is provided on the outside of the outer ring gear 10. The ring gear brake 3 is in a fixed state and can lock the outer ring gear 10. The planetary carrier 9 is connected to the input end of the speed change gear set 4 through a transmission connection. The output end of the speed change gear set 4 is provided with a speed change gear set output shaft 12. A main drive motor reduction gear 13 is provided between the output end of the main drive motor 2 and the speed change gear set output shaft 12, and the main drive motor reduction gear 13 is connected to the output end of the main drive motor 2 through the main drive motor reduction gear 13. The speed change gear set output shaft 12 is connected to the input end of the differential 5 through a transmission connection.

[0023] In this specific embodiment, the dual-motor two-speed hybrid transmission also includes an auxiliary drive motor 14, and an auxiliary drive motor reduction gear 15 is provided between the output end of the auxiliary drive motor 14 and the clutch I6 and is transmission-connected through the auxiliary drive motor reduction gear 15.

[0024] In this specific embodiment, the clutch I 6 and the clutch II 7 are each a dry clutch or a wet clutch.

[0025] In this specific embodiment, there are multiple ring gear brakes 3 and they are evenly spaced around the center line of the outer ring gear 10 .

[0026] In this embodiment, there are five power transmission paths: the first is from the main drive motor 2 to the speed gear set output shaft 12; the second is from the engine 1 to the sun gear input shaft 11, the sun gear 8 of the planetary gear set, through the planetary carrier 9, and the speed gear set 4, to the speed gear set output shaft 12; the third is from the engine 1 to the sun gear input shaft 11, the planetary gear set, and the speed gear set 4, to the speed gear set output shaft 12, wherein the planetary gear set rotates as a whole; the fourth is from the auxiliary drive motor 14 to the clutch 16 through gear meshing, and then from the sun gear input shaft 11, the sun gear 8, through the planetary carrier 9, and the speed gear set 4 to the speed gear set output shaft 12; the fifth is from the auxiliary drive motor 14 to the clutch 16 through gear meshing, and then from the sun gear input shaft 11, the planetary gear set, and the speed gear set 4 to the speed gear set output shaft 12, wherein the planetary gear set rotates as a whole. Using a planetary gear set as a speed shifting structure eliminates power interruption during mode switching, improving the smoothness and stability of the system's power transmission.

[0027] The planetary gear shift mechanism is implemented as follows:

[0028] 1st gear: Clutch II 7 is disengaged, the ring gear brake 3 is connected and locked with the outer ring gear 10, and the power is transmitted from the sun gear 8 to the planetary carrier 9. A fixed transmission ratio is formed between the sun gear 8 and the planetary carrier 9. The transmission ratio value is greater than 1, and the gear ratio is then adjusted by the speed gear set 4.

[0029] 2nd gear: Clutch II 7 is engaged, the ring gear brake 3 is disengaged from the outer ring gear 10, the sun gear 8 is fixedly connected to the outer ring gear 10, the power is directly transferred from the planetary gear set, the planetary gear set rotates as a whole, the transmission ratio is equal to 1, and then the gear ratio is adjusted by the speed gear set 4.

[0030] N gear: Clutch II 7 is disengaged, and the ring gear brake 3 is disengaged from the outer ring gear 10.

[0031] During operation, this dual-motor two-speed hybrid transmission is controlled by the vehicle's energy management control module and has the following operating modes:

[0032] Pure electric single motor drive mode

[0033] like Figure 2As shown, clutch I6 is disconnected and the engine 1 is not working, and the auxiliary drive motor 14 engages the external teeth of clutch I6 to transmit the torque to the sun gear input shaft 11, and then transmits the torque to the speed gear set output shaft 12 through the planetary gear shift mechanism and the speed gear set 4, and together with the main drive motor 2, transmits the torque to the differential 5 through the differential gear, and finally the differential 5 outputs the power.

[0034] Engine direct drive mode

[0035] like Figure 3 As shown, clutch I6 engages the engine to start working, and the engine 1 transmits the torque to the sun gear input shaft 11, and then the sun gear input shaft 11 transmits the torque to the speed gear set output shaft 12 through the planetary gear shift mechanism and the speed gear set 4, and then the speed gear set output shaft 12 transmits the torque to the differential 5 through the differential gear, and finally the differential 5 outputs the power.

[0036] Hybrid drive mode

[0037] like Figure 4 As shown, clutch I6 is engaged, the engine 1 transmits the torque to the sun gear input shaft 11, and then the sun gear input shaft 11 transmits the torque to the speed gear set output shaft 12 through the planetary gear shift mechanism and the speed gear set 4, and the main drive motor 2 transmits the torque to the differential 5 through the differential gear, and finally the differential 5 outputs the power.

[0038] Driving charging mode

[0039] like Figure 5 As shown, clutch I6 is engaged, the planetary gearshift mechanism is in N gear, and engine 1 transmits torque to auxiliary drive motor 14 through the external gears of clutch I6. Driven by auxiliary drive motor reduction gear 15, auxiliary drive motor 14 rotates to charge the battery. The main drive motor 2 is working, transmitting torque to differential 5 through the differential gear, which ultimately outputs power.

[0040] Parking power generation mode

[0041] like Figure 6 As shown, the clutch I6 is engaged, the planetary gear shift mechanism is placed in N gear, and the engine 1 transmits the torque to the auxiliary drive motor 14 through the external teeth of the clutch I6, so that the auxiliary drive motor 14 rotates under the drive of the auxiliary drive motor reduction gear 15 to charge the battery.

[0042] Energy recovery mode

[0043] like Figure 7As shown, since the transmission path from the main drive motor 2 to the wheel is the shortest and the braking energy recovery is high, when the vehicle is coasting or there is a braking demand, the planetary gear shift mechanism is placed in N gear, the engine 1 and the auxiliary drive motor 14 do not work, and the differential 5 transmits the torque to the main drive motor 2 through the differential gear, so that the main drive motor 2 rotates under the drive of the main drive motor reduction gear to charge the battery.

[0044] The device can be installed on plug-in hybrid passenger vehicles and non-plug-in hybrid passenger vehicles.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention that do not depart from the purpose and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A dual-motor two-speed hybrid transmission, characterized by: The system comprises an engine, a main drive motor, a planetary gear set, a ring gear brake, a speed gear set, a differential, clutch I, and clutch II. The planetary gear set comprises a sun gear, a planet carrier, and an outer ring gear arranged concentrically from the inside out. The planet carrier is mounted with planetary gears meshing with the sun gear, and the outer ring gear meshes with the planetary gears. A sun gear input shaft is mounted on the sun gear. The engine output end is connected to the sun gear input shaft via clutch I, and the sun gear input shaft is connected to the outer ring gear via clutch II. A ring gear brake is mounted on the outer side of the outer ring gear. The ring gear brake is in a fixed state and can lock the outer ring gear. The planetary gear set is connected to the input end of the speed gear set, so that the speed gear set adjusts the transmission ratio after the power is shifted by the planetary gear set. The output end of the speed gear set is equipped with an output shaft of the speed gear set. A main drive motor reduction gear is arranged between the output end of the main drive motor and the output shaft of the speed gear set, and is connected to the main drive motor reduction gear via the main drive motor reduction gear. The output shaft of the speed gear set is connected to the input end of the differential.

2. The dual-motor two-speed hybrid transmission according to claim 1, characterized in that: The dual-motor two-speed hybrid transmission also includes an auxiliary drive motor, and an auxiliary drive motor reduction gear is provided between the output end of the auxiliary drive motor and clutch I, and the auxiliary drive motor reduction gear is used for transmission connection.

3. The dual-motor two-speed hybrid transmission according to claim 1, characterized in that: The clutch I and the clutch II are each a dry clutch or a wet clutch.

4. The dual-motor two-speed hybrid transmission according to claim 1, characterized in that: There are multiple ring gear brakes and they are evenly spaced around the center line of the outer ring gear.

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