Power split hybrid power transmission mechanism with four fixed transmission ratios

Abstract

The invention provides a power split hybrid power transmission mechanism with four fixed transmission ratios, 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, the second planet carrier and the third planet carrier are fixedly connected in sequence to form a first connecting component, and the first sun gear and the second sun gear are fixedly connected to form a second connecting component; the first brake is connected with the third gear ring, the second brake is connected with the second sun gear, and the third brake is connected with the third sun gear. The first clutch is connected with the second gear ring and the third gear ring, the second clutch is connected with the first connecting component and the second connecting component, the input shaft is connected with the first planet carrier, and the output shaft is connected with the third planet carrier. The method has the beneficial effects that the driving requirements of different road conditions are met, all modes are reasonably switched, and the method is suitable for the new energy hybrid power vehicle.

Description

Technical Field

[0001] The invention relates to the technical field of automobile transmissions, and in particular to a power split hybrid power transmission mechanism with four fixed transmission ratios. 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 (THS). 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 with four fixed gear ratios.

[0004] An embodiment of the present invention provides a power split hybrid transmission mechanism with four fixed gear ratios, including an input shaft, an output shaft, a planetary gear assembly and a torque transmitting device.

[0005] 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, the second planet carrier, and the third planet carrier are sequentially fixedly connected to form a first coupling member, and the first sun gear and the second sun gear are fixedly connected to form a second coupling member;

[0008] The first brake is connected to the third ring gear, the second brake is connected to the second sun gear, and the third brake is connected to the third 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, 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 third 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 third 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, the planetary gear assembly and the torque transmission device are both arranged in the housing, and the first brake, the second brake and the third brake are all fixedly installed in the housing.

[0022] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention are:

[0023] 1. A power-split hybrid transmission mechanism with four fixed transmission ratios of the present invention can realize four power modes, namely, pure electric mode, input split mode, compound split mode and engine mode, by controlling the working state of the clutch and the brake and the power input. It can meet the driving needs of different road conditions, and the switching between the modes is reasonable, which is suitable for new energy hybrid vehicles.

[0024] 2. The power-split hybrid transmission mechanism of the present invention has four fixed transmission ratios. When the power mode is the engine mode, it can achieve four fixed transmission ratios, that is, four gears, including one reduction gear, one 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.

[0025] 3. The power-split hybrid transmission mechanism of the present invention has four fixed transmission ratios. When the adjacent gears are switched in the power mode of the engine mode, only the working state of one torque transfer device (i.e., the clutch or the brake) is changed, that is, the single conversion principle is satisfied, so that the gear switching control of the vehicle is simple, the structure is compact, and the transmission is smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a transmission principle diagram of a power split hybrid transmission mechanism with four fixed transmission ratios of the present invention;

[0027] Figure 2 It is a working logic diagram of a power split hybrid transmission mechanism with four fixed transmission ratios of the present invention.

[0028] 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, input shaft; C1, first clutch; C2, second clutch; B1, first brake; B2, second brake; B3, third brake. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the embodiments of the present invention 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Please refer to Figure 1 , an embodiment of the present invention provides a power split hybrid transmission mechanism with four fixed gear ratios, including an input shaft 20, an output shaft 2, a planetary gear assembly and a torque transmitting device.

[0035] 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 6, a first planetary gear 7, a first planet carrier 8 and a first sun gear 9. 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. 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.

[0036] The number of the first planetary gears 7 in the first planetary gear row is generally set to be multiple, the first ring gear 6 and each of the first planetary gears 7 are internally meshed for transmission, each of the first planetary gears 7 is externally meshed for transmission with the first sun gear 9, and each of the first planetary gears 7 is mounted on the first planet carrier 8 and rotates around the first planet carrier 8.

[0037] The number of the second planetary gears 11 in the second planetary gear row is generally set to be multiple, the second ring gear 10 and each of the second planetary gears 11 are internally meshed for transmission, each of the second planetary gears 11 is externally meshed for transmission with the second sun gear 13, and each of the second planetary gears 11 is mounted on the second planetary carrier 12 and rotates around the second planetary carrier 12.

[0038] The number of the third planetary gears 15 in the third planetary gear row is generally set to be multiple, the third ring gear 14 and each of the third planetary gears 15 are internally meshed for transmission, each of the third planetary gears 15 is externally meshed for transmission with the third sun gear 17, and each of the third planetary gears 15 is mounted on the third planet carrier 16 and rotates around the third planet carrier 16.

[0039] 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 .

[0040] The first ring gear 6 , the second planet carrier 12 , and the third planet carrier 16 are fixedly connected in sequence to form a first connecting member 18 , and the first sun gear 9 and the second sun gear 13 are fixedly connected to form a second connecting member 19 .

[0041] The first brake B1 is connected to the third ring gear 14 , the second brake B2 is connected to the second sun gear 13 , and the third brake B3 is connected to the third sun gear 17 .

[0042] 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 .

[0043] The input shaft 20 is connected to the first planet carrier 8, and the output shaft 2 is connected to the third planet carrier 16. The first sun gear 9 and the third ring gear 14 are generally connected to two motors respectively.

[0044] Generally, a power-split hybrid transmission mechanism with four fixed transmission ratios of the present invention also 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.

[0045] A power split hybrid transmission mechanism with four fixed transmission ratios of the present invention can realize multiple power modes. As in this embodiment, a power split hybrid transmission mechanism with four fixed transmission ratios 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 20.

[0046] Please refer to Figure 2 The working logic diagram of a power split hybrid transmission mechanism with four fixed transmission ratios in the present invention is shown in FIG. 1 , where “√” indicates that the power source (engine 1, motor) is started, or the torque transmission device (clutch, brake) is engaged. The power modes of a power split hybrid transmission mechanism with four fixed transmission ratios of the present invention mainly include pure electric mode, input split mode, compound split mode and engine mode. The details are as follows:

[0047] Pure electric mode: the second motor 4 is started and the third brake B3 is engaged. At this time, a power-split hybrid transmission mechanism with four fixed transmission ratios of the present invention is completely driven by the second motor 4, and the output shaft 2 outputs pure electric power.

[0048] Input split mode: the engine 1, the first motor 3 and the second motor 4 are all started, and the third brake B3 is engaged. At this time, a power split hybrid transmission mechanism with four fixed transmission ratios of the present invention operates in input split mode, and the output shaft 2 outputs mixed power.

[0049] Compound split mode: the engine 1, the first motor 3 and the second motor 4 are all started, and the first clutch C1 is engaged. At this time, a power split hybrid transmission mechanism with four fixed transmission ratios of the present invention operates in compound split mode, and the output shaft 2 outputs mixed power.

[0050] Engine mode: only the engine 1 is used as the power input.

[0051] 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.

[0052] First gear working mode: the first gear is a deceleration gear, the first brake B1 is engaged, the first clutch C1 is engaged, and a first gear transmission ratio between the input of the engine 1 and the output shaft 2 is established, and the first gear transmission ratio is greater than 1;

[0053] Second gear working mode: the second gear is a direct gear, the first clutch C1 is engaged, the second clutch C2 is engaged, and a second gear transmission ratio between the input of the engine 1 and the output shaft 2 is established, and the second gear transmission ratio is equal to 1;

[0054] Third gear working mode: the third gear is an overdrive gear, the second brake B2 is engaged, the first clutch C1 is engaged, and a third gear transmission ratio between the input of the engine 1 and the output shaft 2 is established, and the third gear transmission ratio is less than 1;

[0055] Fourth gear working mode: the fourth gear is the overdrive gear, the third brake B3 is engaged, the first clutch C1 is engaged, and the fourth gear transmission ratio between the engine 1 input and the output shaft 2 is established, and the fourth gear transmission ratio is less than 1.

[0056] 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.

[0057] 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 with four fixed gear ratios, characterized in that: Includes input shaft, output shaft, planetary gear assembly and torque transmission device, 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, the second planet carrier, and the third planet carrier are sequentially fixedly connected to form a first coupling member, and the first sun gear and the second sun gear are fixedly connected to form a second coupling member; The first brake is connected to the third ring gear, the second brake is connected to the second sun gear, and the third brake is connected to the third 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, and the output shaft is connected to the third planet carrier.

2. A power split hybrid transmission mechanism with four fixed gear ratios 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 with four fixed gear ratios 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 with four fixed gear ratios 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 with four fixed gear ratios as claimed in claim 4, characterized in that: The second motor is started, the third brake is engaged, and the output shaft outputs pure electric power.

6. A power split hybrid transmission mechanism with four fixed gear ratios as claimed in claim 4, characterized in that: The engine, the first motor, and the second motor are started, the third brake is engaged, and the output shaft outputs hybrid power.

7. A power split hybrid transmission mechanism with four fixed gear ratios 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 with four fixed gear ratios as claimed in claim 1, characterized in that: The invention also comprises a housing, wherein the planetary gear assembly and the torque transmission device are both arranged in the housing, and the first brake, the second brake and the third brake are all fixedly installed in the housing.

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