A three planetary row dual mode hybrid power transmission device

Abstract

The application provides a three-planet-row dual-mode hybrid power transmission device, which comprises an engine input shaft, a generator G, a motor M, an output shaft, a planetary gear assembly, a brake and a housing; the planetary gear assembly comprises a first planetary gear row, a second planetary gear row and a third planetary gear row, and the three rows are in power transmission cooperation with each other; the third planetary gear row is connected with the output shaft in power output and connected with the motor M in power input; the first planetary gear row is connected with the generator G in power output and connected with the engine input shaft in power input; the engine input shaft, the generator G, the motor M and the brake can be in different states to ensure that the whole device is in multiple working modes, including a pure electric mode, an input split mode, a compound split mode and a reverse mode. The device can provide multiple modes to meet different requirements of vehicle low-speed driving and high-speed driving; and the control of each mode only needs to combine one control element, and the control is simple.

Description

Technical Field

[0001] This invention relates to the field of hybrid vehicle transmission technology, and more particularly to a three-planetary-gear dual-mode hybrid transmission device. Background Technology

[0002] With the increasing severity of global energy shortages and environmental pollution, energy conservation and emission reduction have become important development directions for the automotive industry. Hybrid powertrains, as devices that can significantly reduce fuel consumption and pollutant emissions, are attracting increasing attention from major automakers. In hybrid powertrains, a power-split configuration can achieve continuously variable transmission (CVT), thereby further reducing engine fuel consumption and harmful gas emissions. However, single-mode hybrid powertrains cannot meet the requirements of a wide range of speed ratios; therefore, it is necessary to combine two power-split modes to propose a dual-mode power-split hybrid powertrain.

[0003] Dual-mode power-split hybrid powertrains can feature different power-split modes, improving system transmission efficiency and vehicle performance. They utilize a planetary gear system, electric motor, clutch, and braking system to achieve multiple power-split modes. The advantages of this powertrain lie in its ability to achieve efficient transmission over a wide gear ratio range, while simultaneously switching modes according to vehicle driving conditions and requirements to achieve optimal fuel economy and emissions performance.

[0004] Despite the many advantages of dual-mode power-split hybrid powertrains, there are currently few mature products available on the market. Therefore, it is essential to research and develop novel dual-mode hybrid powertrains. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a three-planetary dual-mode hybrid power transmission device.

[0006] An embodiment of the present invention provides a three-planetary-gear dual-mode hybrid power transmission device, including an engine input shaft, a generator G, a motor M, an output shaft, a planetary gear assembly, a brake, and a housing;

[0007] The planetary gear assembly includes a first planetary gear set, a second planetary gear set, and a third planetary gear set, which work together to drive each other. The output shaft is connected to the third planetary gear set for power output, the generator G is connected to the first planetary gear set for power output, the engine input shaft is connected to the first planetary gear set for power input, and the motor M is connected to the third planetary gear set for power input. The third planetary gear set is connected to the housing via a brake. The different states of the engine input shaft, the generator G, the motor M, and the brake ensure that the entire device is in multiple operating modes, including pure electric mode, input split mode, compound split mode, and reverse mode.

[0008] Furthermore, the first planetary gear set includes a first sun gear, a first planet gear, a first planet carrier, and a first gear ring, wherein the first planet gear is rotatably mounted on the first planet carrier, the first sun gear meshes externally with the first planet gear, and the first planet gear meshes internally with the first gear ring.

[0009] Furthermore, the engine input shaft is fixedly connected to the first gear ring, and the first sun gear is fixedly connected to the generator G.

[0010] Furthermore, the second planetary gear set includes a second sun gear, a second planet gear, a second planet carrier, and a second ring gear, wherein the second planet gear is rotatably mounted on the second planet carrier, the second sun gear meshes externally with the second planet gear, and the second planet gear meshes internally with the second ring gear.

[0011] Furthermore, the first gear ring is fixedly connected to the second gear ring, and the first planetary carrier is fixedly connected to the second planetary carrier.

[0012] Furthermore, the third planetary gear set includes a third sun gear, a third planet gear, a third planet carrier, and a third ring gear, wherein the third planet gear is rotatably mounted on the third planet carrier, the third sun gear meshes externally with the third planet gear, and the third planet gear meshes internally with the third ring gear.

[0013] Furthermore, the second planetary carrier is fixedly connected to the third sun gear, the output shaft is fixedly connected to the third planetary carrier, and the motor M is fixedly connected to the third sun gear.

[0014] Furthermore, one end of the brake is fixedly connected to the housing, and the other end is connected to the third gear ring, which is connected to the second gear ring via a clutch.

[0015] Furthermore, the clutch is a multi-plate wet clutch or a jaw clutch, and the brake is a drum brake or a multi-plate wet brake.

[0016] Furthermore, the pure electric mode operation is as follows: the engine input shaft is closed to reduce power input, then the brake is engaged, and the generator G is turned off and the motor M is started;

[0017] The input split mode operates as follows: the engine input shaft is activated to input power, and the generator G and the motor M are started to work, followed by engagement of the brake;

[0018] The combined flow splitting mode operates as follows: the engine input shaft is activated to input power, and the generator G and the motor M are started to work, followed by engagement of the clutch;

[0019] The reverse gear mode operates as follows: the engine input shaft is shut off to reduce power input, and the generator G is turned off. Subsequently, the motor M is reverse-driven, and the brake is engaged.

[0020] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: The three-planetary dual-mode hybrid power transmission device of the present invention, firstly, adopts a planetary gear train mechanism as its core mechanism, which has high transmission efficiency, mature manufacturing process, simple and compact structure, and small axial dimension; secondly, it can provide two power splitting modes, input splitting and compound splitting, to meet the different needs of low-speed driving and high-speed driving of the vehicle; thirdly, the control of each mode only requires the combination of one control element (clutch or brake), which simplifies the control. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a three-planetary dual-mode hybrid power transmission device according to the present invention.

[0022] In the diagram: 1-Engine input shaft, 2-Generator G, 3-Motor M, 4-Output shaft, 5-First gear ring, 6-First planetary gear, 7-First planetary carrier, 8-First sun gear, 9-Second gear ring, 10-Second planetary gear, 11-Second planetary carrier, 12-Second sun gear, 13-Third gear ring, 14-Third planetary gear, 15-Third planetary carrier, 16-Third sun gear, 0-Housing, B1-Brake, C1-Clutch. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] Please refer to Figure 1The present invention provides a three-planetary-gear dual-mode hybrid power transmission device, including an engine input shaft 1, a generator G2, a motor M3, an output shaft 4, a planetary gear assembly, a brake B1, and a housing 0.

[0025] In this embodiment, the information gear assembly includes a first planetary gear set, a second planetary gear set, and a third planetary gear set, wherein the first planetary gear set, the second planetary gear set, and the third planetary gear set cooperate with each other for transmission; the engine input shaft 1 is connected to the first planetary gear set for power input, the motor M3 is connected to the third planetary gear set for power input, the first planetary gear set is connected to the generator G2 for power output, and the third planetary gear set is connected to the output shaft 4 for power output; wherein the generator G2 is used to convert the power output by the planetary gear assembly into electrical energy to supply power to the motor M3 or other equipment on the vehicle, and the output shaft 4 is used to provide driving power to the vehicle; it should be noted here that the electrical energy generated by the generator G2 is first stored in the battery on the vehicle, and then the battery outputs electrical energy.

[0026] The first planetary gear set includes a first sun gear 8, a first planet gear 6, a first planet carrier 7, and a first ring gear 5. The first planet gear 6 is rotatably mounted on the first planet carrier 7. The first sun gear 8 and the first planet gear 6 are externally meshed for transmission, and the first planet gear 6 and the first ring gear 5 are internally meshed for transmission. In this embodiment, the engine input shaft 1 is fixedly connected to the first ring gear 5, thereby driving the first ring gear 5 when needed. The generator G2 is also connected to the first sun gear 8 for transmission, so that the rotation of the first sun gear 8 drives the generator G2 to convert mechanical energy into electrical energy when needed.

[0027] The second planetary gear set includes a second sun gear 12, a second planet gear 10, a second planet carrier 11, and a second ring gear 9. The second planet gear 10 is rotatably mounted on the second planet carrier 11. The second sun gear 12 and the second planet gear 10 are externally meshed for transmission, and the second planet gear 10 and the second ring gear 9 are internally meshed for transmission. In this embodiment, the first ring gear 5 and the second ring gear 9 are fixedly connected so that when power is input from the engine input shaft 1, the first ring gear 5 and the second ring gear 9 are driven simultaneously. The first planet carrier 7 and the second planet carrier 11 are fixedly connected.

[0028] The third planetary gear set includes a third sun gear 16, a third planet gear 14, a third planet carrier 15, and a third ring gear 13. The third planet gear 14 is rotatably mounted on the third planet carrier 15. The third sun gear 16 and the third planet gear 14 are externally meshed for transmission, and the third planet gear 14 and the third ring gear 13 are internally meshed for transmission. In this embodiment, the second planet carrier 11 is fixedly connected to the third sun gear 16, and the third sun gear 16 is connected to the motor M3 for transmission. This allows the motor M3 to drive the third sun gear 16 and the second planet carrier 11 when needed. The output shaft 4 is fixedly connected to the third planet carrier 15 to obtain the output power through the third planet carrier 15.

[0029] A brake B1 is provided on the housing 0. One end of the brake B1 is fixedly connected to the housing 0, and the other working end is connected to the third gear ring 13 so as to engage with the third gear ring 13 when needed. Meanwhile, in this embodiment, the second gear ring 9 is connected to the third gear ring 13 through the clutch C1.

[0030] It should be noted that in this embodiment, clutch C1 is a multi-plate wet clutch or a jaw clutch, and brake B1 is a drum brake or a multi-plate wet brake. Similarly, clutch C1 and brake B1 can also be selected according to the actual working conditions and are not limited to this embodiment.

[0031] In this embodiment, a three-planetary dual-mode hybrid power transmission device can achieve multiple working modes through the coordinated operation of the engine input shaft 1, generator G2, motor M3, brake B1, and clutch C1. The working modes include pure electric mode, input split mode, compound split mode, and reverse mode.

[0032] In this embodiment, a three-planetary dual-mode hybrid power transmission device, when a pure electric mode is required, firstly, by engaging the brake B1, the engine input shaft 1 is closed, there is no power input, and the motor M3 operates, thus achieving the pure electric mode. Specifically, the brake B1 is engaged so that the third gear ring 13 is connected to the housing 0, preventing the rotation of the third gear ring 13 relative to the transmission housing 0, and the vehicle is driven only by the motor M3.

[0033] In this embodiment, a three-planetary-gear dual-mode hybrid power transmission requires an input split mode. By engaging the brake B1, the engine input shaft 1 operates, providing power input. The generator G2 and motor M3 also operate, achieving an input split power split mode. Specifically, the brake B1 is engaged to connect the third ring gear 13 to the housing 0, preventing rotation of the third ring gear 13 relative to the transmission housing 0. At this time, the power from the engine input shaft 1 is divided into two parts. One part is input to the first ring gear 5 and the second ring gear 9, flowing through the first planetary carrier 7 and the second planetary carrier 11 to the third sun gear 16, entering the third planetary gear set, and finally flowing into the output shaft 4. The other part of the power is used by the first sun gear 8 to drive the generator G2, generating electricity which is then stored. This electricity then drives the second motor MG2 to rotate the third sun gear 16, flowing into the second planetary carrier 15, and finally into the output shaft 4. This power split mode occurs at the first and second planetary gear sets and is suitable for vehicle start-up and low-speed driving.

[0034] In this embodiment, a three-planetary-gear dual-mode hybrid power transmission device, when a compound power split mode is required, engages the clutch C1. At this time, the engine input shaft 1 operates, providing power input, and the generator G2 and motor M3 operate, achieving a compound power split mode. Specifically, clutch C1 is engaged so that the second ring gear 9 and the third ring gear 13 are connected and rotate together. Power from the engine input shaft 1 is input to the first ring gear 5 and the second ring gear 9. A portion flows through the first planetary carrier 7 and the second planetary carrier 11 to the third sun gear 16, enters the third planetary gear set, and finally flows to the output shaft 4. A portion flows through the third ring gear 13 to the third planetary carrier 15 and finally to the output shaft 4. A portion of the power drives the generator G2 through the first sun gear 8, generating electricity which is then stored. This electricity then drives the motor M3 to rotate the third sun gear 16, flowing through the third sun gear 16 to the third planetary carrier 15 and finally to the output shaft 4. This mode is a compound power split mode, suitable for vehicles traveling at medium to high speeds.

[0035] In this embodiment, a three-planetary dual-mode hybrid power transmission device, when the reverse gear mode is required, engages the brake B1. At this time, the engine input shaft 1 is closed, and there is no power input. The motor M3 reverses to drive the vehicle in reverse, thus achieving reverse gear.

[0036] The operation logic tables for clutch C1, brake B1, engine input shaft 1, generator G2, and motor M3 under the above four modes are shown in the table below:

[0037] pure electric mode / join stop stop start up Input splitting mode / join start up start up start up Composite Diversion Mode join / start up start up start up Reverse mode / join stop stop start up

[0038] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0039] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A three-planetary-gear dual-mode hybrid power transmission device, characterized in that, It includes the engine input shaft, generator G, motor M, output shaft, planetary gear assembly, brake, and housing; The planetary gear assembly includes a first planetary gear set, a second planetary gear set, and a third planetary gear set, which work together to drive each other. The output shaft is connected to the third planetary gear set for power output, the generator G is connected to the first planetary gear set for power output, the engine input shaft is connected to the first planetary gear set for power input, and the motor M is connected to the third planetary gear set for power input. The third planetary gear set is connected to the housing via a brake. The engine input shaft, the generator G, the motor M, and the brake being in different states can ensure that the entire device is in multiple working modes, including pure electric mode, input split mode, compound split mode, and reverse mode. The first planetary gear set includes a first sun gear, a first planet gear, a first planet carrier, and a first gear ring, wherein the first planet gear is rotatably mounted on the first planet carrier, the first sun gear meshes externally with the first planet gear, and the first planet gear meshes internally with the first gear ring. The second planetary gear set includes a second sun gear, a second planet gear, a second planet carrier, and a second ring gear, wherein the second planet gear is rotatably mounted on the second planet carrier, the second sun gear meshes externally with the second planet gear, and the second planet gear meshes internally with the second ring gear. The first gear ring is fixedly connected to the second gear ring, and the first planet carrier is fixedly connected to the second planet carrier; The engine input shaft is fixedly connected to the first gear ring, and the first sun gear is fixedly connected to the generator G; The third planetary gear set includes a third sun gear, a third planet gear, a third planet carrier, and a third ring gear. The third planet gear is rotatably mounted on the third planet carrier. The third sun gear meshes externally with the third planet gear, and the third planet gear meshes internally with the third ring gear. The second planetary carrier is fixedly connected to the third sun gear, the output shaft is fixedly connected to the third planetary carrier, and the motor M is fixedly connected to the third sun gear; One end of the brake is fixedly connected to the housing, and the other end is connected to the third gear ring. The third gear ring is connected to the second gear ring through a clutch.

2. The three-planetary dual-mode hybrid power transmission device according to claim 1, characterized in that, The clutch is a multi-plate wet clutch or a jaw clutch, and the brake is a drum brake or a multi-plate wet brake.

3. The three-planetary dual-mode hybrid power transmission device according to claim 1, characterized in that, The pure electric mode operation is as follows: the engine input shaft is closed to reduce power input, then the brake is engaged, and the generator G is turned off and the motor M is started; The input split mode operates as follows: the engine input shaft is activated to input power, and the generator G and the motor M are started to work, followed by engagement of the brake; The combined flow splitting mode operates as follows: the engine input shaft is activated to input power, and the generator G and the motor M are started to work, followed by engagement of the clutch; The reverse gear mode operates as follows: the engine input shaft is shut off to reduce power input, and the generator G is turned off. Subsequently, the motor M is reverse-driven, and the brake is engaged.

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