Power split hybrid power transmission mechanism suitable for new energy automobile

Abstract

The invention provides a power split hybrid power transmission mechanism suitable for a new energy automobile, which relates to the technical field of automobile transmissions, and comprises an input shaft, an output shaft, a planetary gear assembly and a torque transmission device, the first gear ring and the second gear ring are fixedly connected to form a first connecting component, the first planet carrier and the second sun gear are fixedly connected to form a second connecting component, and the second planet carrier and the third planet carrier are fixedly connected to form a third connecting component. The first brake is connected with the third gear ring, the second brake is connected with the third sun gear, and the third brake is connected with the first sun gear; the first clutch is connected with the second and third gear rings; the second clutch is connected with the first and second connecting members; the input shaft is connected with the first planet carrier. The output shaft is connected with the third planet carrier. The four-mode hybrid power system has the beneficial effects that four power modes can be realized by controlling the working states and power input of the clutch and the brake, and switching is carried out according to different driving requirements and road conditions, so that the performance is optimized, and different driving requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile transmissions, and in particular to a power split hybrid transmission mechanism suitable for new energy vehicles. Background Art

[0002] With the acceleration of automobile electrification, major automakers have begun to actively explore hybrid technology to improve fuel economy and reduce exhaust emissions. Toyota has proposed the far-reaching Toyota hybrid system. The system has a simple structure, including an engine, two motors and a planetary gear set, which realizes the effective diversion of engine power. As one of the core components of hybrid vehicles, the hybrid transmission can provide appropriate vehicle driving force according to the needs of changing road conditions and driving conditions. However, the current hybrid transmission has a single structure, few gears and working modes, low fuel efficiency, and complex control. Therefore, the design of a new power-dividing hybrid transmission mechanism is very necessary. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a power-split hybrid transmission mechanism suitable for new energy vehicles.

[0004] An embodiment of the present invention provides a power split hybrid transmission mechanism suitable for new energy vehicles, comprising an input shaft, an output shaft, a planetary gear assembly and a torque transmission device;

[0005] Wherein, the planetary gear assembly includes a first planetary gear row, a second planetary gear row and a third planetary gear row, the first planetary gear row includes a first ring gear, a first planetary gear, a first planetary carrier and a first sun gear, the second planetary gear row includes a second ring gear, a second planetary gear, a second planetary carrier and a second sun gear, and the third planetary gear row includes a third ring gear, a third planetary gear, a third planetary carrier and a third sun gear;

[0006] The torque transmitting device includes a first clutch, a second clutch, a first brake, a second brake, and a third brake;

[0007] The first ring gear and the second ring gear are fixedly connected to form a first connecting member, the first planet carrier and the second sun gear are fixedly connected to form a second connecting member, and the second planet carrier and the third planet carrier are fixedly connected to form a third connecting member;

[0008] The first brake is connected to the third ring gear, the second brake is connected to the third sun gear, and the third brake is connected to the first sun gear;

[0009] The first clutch connects the second gear ring and the third gear ring, and the second clutch connects the first coupling member and the second coupling member;

[0010] The input shaft is connected to the first planet carrier, the first sun gear and the third ring gear can be configured to be connected to two motors respectively, and the output shaft is connected to the third planet carrier.

[0011] Furthermore, it also includes an engine, which is connected to the input shaft.

[0012] Furthermore, only the engine is used as the power input, and four gear working modes are realized by controlling the working states of the clutch and the brake:

[0013] First gear working mode: the first brake is engaged, the first clutch is engaged, and a first gear transmission ratio between the engine input and the output shaft is established, and the first gear transmission ratio is greater than 1;

[0014] Second gear working mode: the first clutch is engaged, the second clutch is engaged, and a second gear transmission ratio between the engine input and the output shaft is established, and the second gear transmission ratio is equal to 1;

[0015] Third gear working mode: the second brake is engaged, the first clutch is engaged, and a third gear transmission ratio between the engine input and the output shaft is established, and the third gear transmission ratio is less than 1;

[0016] Fourth gear working mode: the third brake is engaged and the first clutch is engaged, and a fourth gear transmission ratio is established between the engine input and the output shaft, and the fourth gear transmission ratio is less than 1.

[0017] Furthermore, it also includes a first motor and a second motor, the first motor is connected to the first sun gear, and the second motor is connected to the third ring gear.

[0018] Furthermore, the second motor is started, the second brake is engaged, and the output shaft outputs pure electric power.

[0019] Further, the engine, the first motor, and the second motor are started, the second brake is engaged, and the output shaft outputs hybrid power.

[0020] Further, the engine, the first motor and the second motor are started, the first clutch is engaged, and the output shaft outputs mixed power.

[0021] Furthermore, it also includes a housing, and the planetary gear assembly and the torque transmission device are both arranged in the housing.

[0022] Further, the first brake connects the third ring gear to the housing, the second brake connects the third sun gear to the housing, and the third brake connects the first sun gear to the housing.

[0023] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention are:

[0024] 1. A power split hybrid transmission mechanism suitable for new energy vehicles of the present invention has a power source composed of a hybrid input of an engine and two motors. By controlling the working state and power input of the clutch and the brake, four power modes, namely, pure electric mode, input split mode, compound split mode and engine mode, can be realized. Intelligent switching can be performed according to different driving needs and road conditions, thereby optimizing the overall performance of the vehicle and adapting to different driving needs.

[0025] 2. The power-split hybrid transmission mechanism of the present invention is suitable for new energy vehicles. In the engine mode, it can achieve four fixed transmission ratios, that is, four gears, including a reduction gear, a direct gear and two overdrive gears, which is beneficial to improving fuel economy and can meet the driving needs of the vehicle in the high-speed cruising stage.

[0026] 3. The power-split hybrid transmission mechanism of the present invention is suitable for new energy vehicles. When switching adjacent gears in the engine mode, only the working state of one torque transmission device is changed, that is, the single conversion principle is satisfied, so that the gear switching control of the vehicle is simple.

[0027] 4. The power-split hybrid transmission mechanism of the present invention is suitable for new energy vehicles. When the vehicle is started, the pure electric mode is used, and the vehicle is driven only by the motor, so as to achieve zero emission and low noise. The input split mode is used in the low-speed stage, and the compound split mode is used in the acceleration stage. The motor and the engine jointly drive the vehicle to provide sufficient power and improve the transmission efficiency. The operating range of the engine is adjusted and optimized by the motor so that it always runs in the high-efficiency zone, thereby reducing emissions and fuel consumption. The engine mode is used in the high-speed cruising stage to achieve high endurance and transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a transmission principle diagram of a power split hybrid transmission mechanism applicable to new energy vehicles of the present invention;

[0029] Figure 2 It is a working logic diagram of a power split hybrid transmission mechanism suitable for new energy vehicles of the present invention.

[0030] In the figure: 1, engine; 2, output shaft; 3, first motor; 4, second motor; 5, housing; 6, first ring gear; 7, first planetary gear; 8, first planetary carrier; 9, first sun gear; 10, second ring gear; 11, second planetary gear; 12, second planetary carrier; 13, second sun gear; 14, third ring gear; 15, third planetary gear; 16, third planetary carrier; 17, third sun gear; 18, first connecting member; 19, second connecting member; 20, third connecting member; 21, input shaft; C1, first clutch; C2, second clutch; B1, first brake; B2, second brake; B3, third brake. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The following is a preferred embodiment of the present invention, which is intended to provide a basic understanding of the present invention, but is not intended to confirm the key or decisive elements of the present invention or to limit the scope of protection.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0034] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0035] It should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Please refer to Figure 1 An embodiment of the present invention provides a power split hybrid transmission mechanism suitable for new energy vehicles, including an input shaft 21, an output shaft 2, a planetary gear assembly and a torque transmission device.

[0037] Wherein, the planetary gear assembly includes a first planetary gear row, a second planetary gear row and a third planetary gear row.

[0038] The first planetary gear row includes a first ring gear 6, a first planetary wheel 7, a first planet carrier 8 and a first sun gear 9, wherein the first ring gear 6 is internally meshed with the first planetary wheel 7 for transmission, the first planetary wheel 7 is externally meshed with the first sun gear 9 for transmission, and the first planetary wheel 7 is supported by the first planet carrier 8 and rotates around the first planet carrier 8.

[0039] The second planetary gear row includes a second ring gear 10, a second planetary gear 11, a second planet carrier 12 and a second sun gear 13, wherein 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 supported by the second planet carrier 12 and rotates around the second planet carrier 12.

[0040] The third planetary gear row includes a third ring gear 14, a third planetary gear 15, a third planet carrier 16 and a third sun gear 17. The third ring gear 14 is internally meshed with the third planetary gear 15, the third planetary gear 15 is externally meshed with the third sun gear 17, and the third planetary gear 15 is supported by the third planet carrier 16 and rotates around the third planet carrier 16.

[0041] The torque transmitting device includes a first clutch C1 , a second clutch C2 , a first brake B1 , a second brake B2 , and a third brake B3 .

[0042] The first ring gear 6 and the second ring gear 10 are fixedly connected to form a first connecting member 18 , the first planet carrier 8 and the second sun gear 13 are fixedly connected to form a second connecting member 19 , and the second planet carrier 12 and the third planet carrier 16 are fixedly connected to form a third connecting member 20 .

[0043] The first brake B1 is connected to the third ring gear 14 , the second brake B2 is connected to the third sun gear 17 , and the third brake B3 is connected to the first sun gear 9 .

[0044] The first clutch C1 connects the second ring gear 10 and the third ring gear 14 , and the second clutch C2 connects the first connecting member 18 and the second connecting member 19 .

[0045] The input shaft 21 is connected to the first planet carrier 8 , the first sun gear 9 and the third ring gear 14 can be configured to be connected to two motors respectively, and the output shaft 2 is connected to the third planet carrier 16 .

[0046] Generally, a power split hybrid transmission mechanism suitable for new energy vehicles of the present invention further includes a housing 5, the planetary gear assembly and the torque transmission device are both arranged in the housing 5, and the first brake B1, the second brake B2 and the third brake B3 are all fixedly installed in the housing 5. The first brake B1 connects the third ring gear 14 with the housing 5, the second brake B2 connects the third sun gear 17 with the housing 5, and the third brake B3 connects the first sun gear 9 with the housing 5.

[0047] A power split hybrid transmission mechanism suitable for new energy vehicles of the present invention can realize multiple power modes. As in the present embodiment, a power split hybrid transmission mechanism suitable for new energy vehicles of the present invention further includes an engine 1, a first motor 3 and a second motor 4, wherein the first motor 3 is connected to the first sun gear 9, the second motor 4 is connected to the third ring gear 14, and the engine 1 is connected to the input shaft 21.

[0048] Please refer to Figure 2 A working logic diagram of a power split hybrid transmission mechanism suitable for new energy vehicles, in which "√" indicates that the power source (engine, motor) is started, or the torque transmission device (clutch, brake) is engaged. The power modes of a power split hybrid transmission mechanism suitable for new energy vehicles of the present invention mainly include pure electric mode, input split mode, compound split mode and engine mode. The details are as follows:

[0049] Pure electric mode: the second motor 4 is started, the second brake B2 is engaged, the third sun gear 17 is connected to the housing 5 by the second brake B2, the rotation of the third sun gear 17 is prevented, and the power is directly transmitted from the second motor 4 to the output shaft 2 through the meshing of the third planetary gear 15 and the third ring gear 14. At this time, the power split hybrid transmission mechanism suitable for new energy vehicles of the present invention is completely driven by the second motor 4 as an input source, and the output shaft 2 outputs pure electric power.

[0050] Input split mode: the engine 1, the first motor 3 and the second motor 4 are all started, the second brake B2 is engaged, and the third sun gear 17 is connected to the housing 5 by the second brake B2, preventing the rotation of the third sun gear 17. At this time, the power split hybrid transmission mechanism suitable for new energy vehicles of the present invention works in the input split mode, and the output shaft 2 outputs the hybrid power.

[0051] Engine mode: only the engine 1 is used as the power input.

[0052] It should be noted that, in the engine mode, four fixed transmission ratios are achieved by controlling the working states of the clutch and the brake, that is, four gear working modes, including one deceleration gear, one direct gear and two overdrive gears.

[0053] First gear working mode: the first gear is a deceleration gear, the first brake B1 is engaged, the first clutch C1 is engaged, the first clutch C1 connects the second gear ring 10 and the third gear ring 14, and the third gear ring 14 is connected to the housing 5 by the first brake B1, establishing a first gear transmission ratio between the input of the engine 1 and the output shaft 2, and the first gear transmission ratio is greater than 1;

[0054] Second gear working mode: the second gear is a direct gear, the first clutch C1 is engaged, the second clutch C2 is engaged, the first clutch C1 connects the second gear ring 10 and the third gear ring 14, and the second clutch C2 connects the first coupling member 18 and the second coupling member 19, establishing a second gear transmission ratio between the input of the engine 1 and the output shaft 2, and the second gear transmission ratio is equal to 1;

[0055] Third gear working mode: the third gear is an overdrive gear, the second brake B2 is engaged, the first clutch C1 is engaged, the third sun gear 17 is connected to the housing 5 by the second brake B2, and the first clutch C1 connects the second ring gear 10 and the third ring gear 14, establishing a third gear ratio between the input of the engine 1 and the output shaft 2, and the third gear ratio is less than 1;

[0056] Fourth gear working mode: the fourth gear is the overdrive gear, the third brake B3 is engaged, the first clutch C1 is engaged, the third brake B3 connects the first sun gear 9 with the housing 5, and the first clutch C1 connects the second ring gear 10 with the third ring gear 14, establishing a fourth gear transmission ratio between the engine 1 input and the output shaft 2, and the fourth gear transmission ratio is less than 1.

[0057] It should be noted that when the power-split hybrid transmission mechanism suitable for new energy vehicles of the present invention switches between adjacent gears in the engine mode, only the working state of one torque transfer device (i.e., the clutch or brake) is changed, that is, the single conversion principle is satisfied, making the gear switching control of the vehicle simple.

[0058] In this article, the directional words such as front, back, top, and bottom involved are defined by the positions of the parts in the drawings and the positions of the parts relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different ways of use and placement, and the use of the directional words should not limit the scope of protection claimed in this application.

[0059] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power split hybrid transmission mechanism suitable for new energy vehicles, characterized in that: including an input shaft, an output shaft, a planetary gear assembly and a torque transmitting device; Wherein, the planetary gear assembly includes a first planetary gear row, a second planetary gear row and a third planetary gear row, the first planetary gear row includes a first ring gear, a first planetary gear, a first planetary carrier and a first sun gear, the second planetary gear row includes a second ring gear, a second planetary gear, a second planetary carrier and a second sun gear, and the third planetary gear row includes a third ring gear, a third planetary gear, a third planetary carrier and a third sun gear; The torque transmitting device includes a first clutch, a second clutch, a first brake, a second brake, and a third brake; The first ring gear and the second ring gear are fixedly connected to form a first connecting member, the first planet carrier and the second sun gear are fixedly connected to form a second connecting member, and the second planet carrier and the third planet carrier are fixedly connected to form a third connecting member; The first brake is connected to the third ring gear, the second brake is connected to the third sun gear, and the third brake is connected to the first sun gear; The first clutch connects the second gear ring and the third gear ring, and the second clutch connects the first coupling member and the second coupling member; The input shaft is connected to the first planet carrier, the first sun gear and the third ring gear can be configured to be connected to two motors respectively, and the output shaft is connected to the third planet carrier.

2. A power split hybrid transmission mechanism suitable for new energy vehicles as claimed in claim 1, characterized in that: Also included is an engine connected to the input shaft.

3. A power split hybrid transmission mechanism suitable for new energy vehicles as claimed in claim 2, characterized in that: Only the engine is used as the power input, and four gear working modes are realized by controlling the working state of the clutch and the brake: First gear working mode: the first brake is engaged, the first clutch is engaged, and a first gear transmission ratio between the engine input and the output shaft is established, and the first gear transmission ratio is greater than 1; Second gear working mode: the first clutch is engaged, the second clutch is engaged, and a second gear transmission ratio between the engine input and the output shaft is established, and the second gear transmission ratio is equal to 1; Third gear working mode: the second brake is engaged, the first clutch is engaged, and a third gear transmission ratio between the engine input and the output shaft is established, and the third gear transmission ratio is less than 1; Fourth gear working mode: the third brake is engaged and the first clutch is engaged, and a fourth gear transmission ratio is established between the engine input and the output shaft, and the fourth gear transmission ratio is less than 1.

4. A power split hybrid transmission mechanism suitable for new energy vehicles as claimed in claim 2, characterized in that: The first motor is connected to the first sun gear, and the second motor is connected to the third ring gear.

5. A power split hybrid transmission mechanism suitable for new energy vehicles as claimed in claim 4, characterized in that: The second motor is started, the second brake is engaged, and the output shaft outputs pure electric power.

6. A power split hybrid transmission mechanism suitable for new energy vehicles as claimed in claim 4, characterized in that: The engine, the first motor, and the second motor are started, the second brake is engaged, and the output shaft outputs hybrid power.

7. A power split hybrid transmission mechanism suitable for new energy vehicles as claimed in claim 4, characterized in that: The engine, the first motor, and the second motor are started, the first clutch is engaged, and the output shaft outputs hybrid power.

8. A power split hybrid transmission mechanism suitable for new energy vehicles as claimed in claim 1, characterized in that: A housing is also included, wherein the planetary gear assembly and the torque transmitting device are disposed within the housing.

9. A power split hybrid transmission mechanism suitable for new energy vehicles as claimed in claim 8, characterized in that: The first brake connects the third ring gear to the housing, the second brake connects the third sun gear to the housing, and the third brake connects the first sun gear to the housing.

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