Gearless double planetary gear hybrid system

Abstract

The present invention discloses a ringless double planetary gear hybrid system, comprising: a first planetary gear mechanism, comprising a first sun gear I, a first sun gear II, a first planetary carrier and a first planetary gear assembly arranged on the first planetary carrier; a second planetary gear mechanism, comprising a second sun gear I, a second sun gear II, a second planetary carrier and a second planetary gear assembly arranged on the second planetary carrier, the first sun gear II and the second sun gear II being fixed as a whole; an engine, drivingly connected to the first planetary carrier; a first motor, drivingly connected to the first sun gear I; a second motor, drivingly connected to the second sun gear I; a brake component, used for controlling the locking or releasing of the first sun gear II and the second sun gear II; a clutch component, used for controlling the engagement or separation between the second sun gear I and the second planetary carrier; an output mechanism, drivingly connected to the second planetary carrier; the hybrid system has a simple structure and is conducive to improving the power and economy of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicles, and in particular to a ring gearless double planetary gear hybrid electric system. Background Art

[0002] In related technologies, automotive hybrid systems achieve power diversion and convergence through single or multiple planetary gears, allowing for greater freedom in adjusting the operating states of the engine and motor, resulting in improved power and economy. However, current power-dividing hybrid systems generally require multiple clutches and / or brakes, as well as transmission structures, to achieve multiple operating modes and ensure the vehicle's adaptability to various driving conditions. Furthermore, to meet dynamic requirements such as hill climbing performance, higher-power motors must be selected, or additional torque-amplifying structures must be installed. These factors inevitably make the hybrid system's overall structure more complex, less compact, and less efficient, hindering overall vehicle manufacturing cost control.

[0003] Therefore, it is necessary to provide a new hybrid power system, hoping to ensure that the vehicle has better adaptability to driving conditions through a relatively simple structure, thereby improving the vehicle's power and economy. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a ringless dual planetary gear hybrid system, which has a simple structure and can ensure that the vehicle has good adaptability to driving conditions, thereby improving the vehicle's power and economy.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a ringless double planetary gear hybrid system, comprising: a first planetary gear mechanism, comprising a first sun gear I, a first sun gear II, a first planetary carrier and a first planetary gear assembly arranged on the first planetary carrier; a second planetary gear mechanism, comprising a second sun gear I, a second sun gear II, a second planetary carrier and a second planetary gear assembly arranged on the second planetary carrier, the first sun gear II and the second sun gear II being fixed as one; an engine, the output end of the engine being transmission-connected to the first planetary carrier; a first motor, the output end of the first motor being transmission-connected to the first sun gear I; a second motor, the output end of the second motor being transmission-connected to the second sun gear I; a brake component, used to control the locking or releasing of the first sun gear II and the second sun gear II; a clutch component, used to control the engagement or separation between the second sun gear I and the second planetary carrier; an output mechanism, the input end of the output mechanism being transmission-connected to the second planetary carrier and used to transmit power to the wheels.

[0006] Further, the first planetary gear assembly includes a first planetary gear I and a first planetary gear II arranged on the first planetary carrier, the first planetary gear I is meshed with the first sun gear I, the first planetary gear II is meshed with the first planetary gear I and meshed with the first sun gear II; the second planetary gear assembly includes a second planetary gear I and a second planetary gear II arranged on the second planetary carrier, the second planetary gear I is meshed with the second sun gear I, the second planetary gear II is meshed with the second planetary gear I and meshed with the second sun gear II.

[0007] Furthermore, the rotation axes of the first motor, the second motor, the first planetary carrier and the second planetary carrier are collinear.

[0008] Furthermore, the first motor is arranged on the front side of the first planetary gear mechanism, and the second motor is arranged on the rear side of the second planetary gear mechanism; a first input shaft is coaxially provided on the first planetary carrier, and the first input shaft extends forward and passes through the output shaft of the first motor; the first sun gear I is fixedly connected to the output shaft of the first motor, and the first input shaft is transmission-connected to the output end of the engine; the second sun gear I is fixedly connected to the output shaft of the second motor.

[0009] Furthermore, the output mechanism includes a power output shaft, which is coaxially fixed to the second planetary carrier and extends backward through the output shaft of the second motor.

[0010] Furthermore, an output gear is fixedly provided on the second planetary carrier, and the output mechanism includes a transmission gear meshing with the output gear.

[0011] Furthermore, the output shaft of the engine is coaxially arranged with the first planet carrier.

[0012] Furthermore, the braking component is a brake, and the clutch component is a clutch.

[0013] Furthermore, a torsional vibration damper is provided between the engine and the first planetary carrier.

[0014] Furthermore, the first sun gear II and the second sun gear II are an integrated structure.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The ringless double planetary gear hybrid system provided by the present invention can realize the multi-mode operation of the vehicle through only one braking component, one clutch component and a double planetary gear mechanism. The overall structure is simple, which is conducive to improving the compactness of the vehicle layout and reducing the production and manufacturing costs of the vehicle. At the same time, there are fewer meshing parts in the system, which is conducive to improving the power transmission efficiency; at the same time, it can reduce the power level requirement for the motor, which is conducive to vehicle cost control; multiple operating modes can ensure that the vehicle has good power and economy under various driving conditions such as low and high speeds, thereby helping to improve the comprehensive economy and power of the vehicle; at the same time, this structure does not require a ring gear, which is also conducive to reducing manufacturing costs.

[0017] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of an embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of another embodiment of the present invention;

[0020] Figure markings: 1-first planetary gear mechanism; 101-first sun gear I; 102-first sun gear II; 103-first planet carrier; 103a-first input shaft; 104-first planet gear I; 105-first planet gear II; 2-second planetary gear mechanism; 201-second sun gear I; 202-second sun gear II; 203-second planet carrier; 203a-output gear; 204-second planet gear I; 205-second planet gear II; 3-engine; 4-first motor; 5-second motor; 6-brake component; 7-clutch component; 8-power output shaft; 9-torsional vibration damper; 10-transmission gear; 11-differential. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention. In the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0022] See also Figure 1-2 The present embodiment discloses a ringless double planetary gear hybrid system, comprising: a first planetary gear mechanism 1, comprising a first sun gear I 101, a first sun gear II 102, a first planetary carrier 103, and a first planetary gear assembly disposed on the first planetary carrier 103; a second planetary gear mechanism 2, comprising a second sun gear I 201, a second sun gear II 202, a second planetary carrier 203, and a second planetary gear assembly disposed on the second planetary carrier 203, wherein the first sun gear II 102 and the second sun gear II 202 are fixed as one body; an engine 3, wherein an output end of the engine 3 is drivingly connected to the first planetary carrier 103; a first motor 4, wherein an output end of the first motor 4 is drivingly connected to the first sun gear I 101; a second motor 5, wherein an output end of the second motor 5 is drivingly connected to the second sun gear I 201; a brake component 6, for controlling the locking or releasing of the first sun gear II 102 and the second sun gear II 202, wherein the brake component 6 is generally a brake; and a clutch component 7. The clutch component 7 is used to control the connection or separation between the second sun gear I 201 and the second planetary carrier 203. The clutch component 7 generally adopts a clutch; the output mechanism, the input end of the output mechanism is connected to the second planetary carrier 203 and is used to transmit power to the wheels; here, the second inner ring gear 203 and the first inner ring gear 103 can be embedded in a gear ring to form an integrated structure, that is, they share a gear ring, that is, the first inner ring gear 103 and the second inner ring gear 203 can achieve synchronous rotation; the output mechanism here is generally a shaft-tooth transmission structure, the input end of the shaft-tooth transmission structure is connected to the second planetary carrier 203, and the output end of the shaft-tooth transmission structure transmits power to the differential 11, and then transmits it to the wheels by the half-shaft. Different layout designs can be adopted according to the layout requirements of the entire vehicle; of course, it can also be understood that the hybrid system also includes a battery, a motor driver, etc. The battery is electrically connected to the motor driver, the first motor 4 and the second motor 5. This part is the same as the existing dual-motor hybrid system and will not be repeated here;

[0023] The hybrid system in the above structure can achieve multi-mode operation of the vehicle through only one brake component 6, one clutch component 7, and a dual planetary gear mechanism. The overall structure is simple, which is conducive to improving the compactness of the vehicle layout and reducing the production and manufacturing costs of the vehicle. At the same time, the system has fewer meshing parts, which is conducive to improving power transmission efficiency. At the same time, it can reduce the power level requirement of the motor, which is conducive to controlling the cost of the vehicle (specifically: here, since the power of the second motor 5 can be output after deceleration and torque increase by the second planetary gear mechanism 2, thereby meeting the power requirements of climbing performance and acceleration performance on flat roads, at high speeds, the power of the second motor 5 can be directly output by the second planetary carrier 203 to ensure high-speed driving requirements. The second motor 5 can use a motor with a smaller peak torque to reduce dependence on the motor). The multiple operating modes (details will be described later) can ensure that the vehicle has good power and economy under various driving conditions, such as low and high speeds, thereby improving the overall economy and power of the vehicle. At the same time, this structure does not require a ring gear, which also helps to reduce manufacturing costs.

[0024] In this embodiment, the first planetary gear assembly includes a first planetary gear I104 and a first planetary gear II105 provided on the first planetary carrier 103, the first planetary gear I104 is meshed with the first sun gear I101, the first planetary gear II105 is meshed with the first planetary gear I104 and meshed with the first sun gear II102; the second planetary gear assembly includes a second planetary gear I204 and a second planetary gear II205 provided on the second planetary carrier 203, the second planetary gear I204 is meshed with the second sun gear I201, the second planetary gear II205 is meshed with the second planetary gear I204 and meshed with the second sun gear II202; it can be understood that here the first planetary gear I104 and the first planetary gear II105 can both be rotated by the pin structure Installed on the first planetary carrier 103; similarly, the second planetary gear I 204 and the second planetary gear II 205 can also be rotatably installed on the second planetary carrier 203 through a pin structure; the first sun gear II 102 and the second sun gear II 202 can be supported by the first planetary carrier 103 and / or the second planetary carrier 203; it can be understood that the first planetary gear I 104 and the first planetary gear II 105 are generally evenly distributed along the circumference of the first planetary carrier 103 and are set to be multiple; similarly, the second planetary gear I 204 and the second planetary gear II 205 are generally evenly distributed along the circumference of the second planetary carrier 203 and are set to be multiple; this structural design has good structural compactness and good power transmission stability. At the same time, by adopting a transmission structure with two sets of planetary gears, it is conducive to achieving a larger transmission ratio, thereby making the deceleration effect better.

[0025] In this embodiment, the rotation axes of the first motor 4, the second motor 5, the first planetary carrier 103 and the second planetary carrier 203 are collinear; by arranging these four coaxially, the overall compactness is improved, especially arranging the first motor 4 and the second motor 5 on the same axis, which can effectively reduce the overall space occupied by the system in the lateral direction of the vehicle, facilitate adaptation to the layout on short-width vehicles, and improve the compactness of the vehicle layout.

[0026] In this embodiment, the first motor 4 is arranged on the front side of the first planetary gear mechanism 1, and the second motor 5 is arranged on the rear side of the second planetary gear mechanism 2; the first planetary carrier 103 is coaxially provided with a first input shaft 103a, which extends forward and passes through the output shaft of the first motor 4; the first sun gear I 101 is fixedly connected to the output shaft of the first motor 4, and the first input shaft 103a is transmission-connected to the output end of the engine 3; the second sun gear I 201 is fixedly connected to the output shaft of the second motor 5; Figure 1 The left end is the front and the right end is the rear, that is, the side close to the engine 3 is the front; specifically, the first input shaft 103a and the first planetary carrier 103 here adopt an integrated structure; it can be understood that the output shaft of the first motor 4 is designed to be a hollow shaft for the first input shaft 103a to pass through; the first sun gear I 101 and the output shaft of the first motor 4 are relatively fixed by a spline connection; here the output shaft of the engine 3 is connected to the first input shaft 103a after passing through the torsional vibration damper 9, and can be connected to the first input shaft 101a through a coupling, a spline connection, etc.; this structural design, through a reasonable layout, further improves the overall compactness of the system. At the same time, the overall transmission chain of the system is short and the number of meshing parts is small, which is conducive to further reducing power waste and improving the overall economic performance of the vehicle.

[0027] In this embodiment, the output mechanism includes a power output shaft 8, which is coaxially fixed to the second planetary carrier 203 and extends backward through the output shaft of the second motor 5; specifically, the power output shaft 8 and the second planetary carrier 203 adopt an integrated structure. Figure 1 The right end is the rear, that is, the side away from the engine 3 is the rear; this structural layout is particularly suitable for front-engine rear-wheel drive models, and the power output shaft 8 is directly output to the rear. For front-engine rear-wheel drive models, the compactness is very high and the transmission efficiency is high.

[0028] In this embodiment, an output gear 203a is fixedly provided on the second planetary carrier 203, and the output mechanism includes a transmission gear 10 meshing with the output gear 203a. Specifically, the output gear 203a and the second planetary carrier 203 are integrated into one structure, and the transmission gear 10 is externally connected to the differential 11, which transmits power to the wheels through the half-shafts. This structural layout is reasonable and is particularly suitable for front-engine, front-wheel drive vehicles. For front-engine, front-wheel drive vehicles, it is very compact and has high transmission efficiency.

[0029] In this embodiment, the output shaft of the engine 3 is arranged coaxially with the first planetary carrier 101; by arranging the engine 3 and the axis of the first planetary carrier 103 coaxially, the compactness of the overall structural arrangement is further improved and the space occupied is reduced; in particular, the first motor 4, the first planetary gear mechanism 1, the second motor 5 and the second planetary gear mechanism 2 are coaxially arranged, and the overall arrangement is extremely compact, which greatly reduces the overall lateral arrangement space occupied.

[0030] In this embodiment, the braking component 6 is a brake, and the clutch component 7 is a clutch; specifically, the clutch 7 here can adopt a multi-plate wet clutch, the active part of the clutch, that is, the input end of the clutch 7 is arranged on the second sun gear I 201, and the driven part of the clutch 7 is arranged on the second planetary carrier 203, and the engagement or separation between the second sun gear I 201 and the second planetary carrier 203 is achieved by controlling the engagement or separation of the active part and the driven part of the clutch; the brake 6 is connected to the first sun gear II 102 or the second sun gear II 202, and the brake 6 can adopt a disc brake, the brake disc of the brake 6 is fixed on the first sun gear II 102 or the second sun gear II 202, and the brake caliper part of the brake 6 is arranged on the frame or other fixed structure, and the brake caliper clamps the brake disc through the brake pad to achieve braking; by adopting the brake and the clutch, the structure is mature and the structural reliability is good.

[0031] In this embodiment, a torsional vibration damper 9 is provided between the engine 3 and the first planetary carrier 103 ; the provision of the torsional vibration damper 9 is conducive to improving the stability of power transmission.

[0032] In this embodiment, the first sun gear II 102 and the second sun gear II 202 are an integrated structure, and the integrated structure has good structural strength.

[0033] Figure 1 、 Figure 2 The structures in the table can all work in the following working modes:

[0034] Pure electric working mode: the brake component 6 is engaged, the clutch component 7 is disengaged, the battery is discharged to the second motor 5, and the second motor 5 is in an electric state; in this mode, it can meet the use of working conditions such as urban congested roads, low-speed driving, and frequent braking, ensuring the power economy in this mode; at the same time, in this mode, the power of the second motor 5 is decelerated and torque-increased by the second planetary gear mechanism 2, and then directly output to the transmission mechanism by the second planetary carrier 203, and then transmitted to the wheels, which can meet the use requirements of climbing performance and starting acceleration, and can improve the power performance of the pure electric mode; at the same time, the engagement of the brake component 6 can prevent power from being transmitted to the first planetary mechanism, thereby avoiding large weak magnetic losses in the first motor 4.

[0035] Extended-range mode: the brake component 6 is engaged, the clutch component 7 is disengaged, the engine 3 works and outputs power to the first motor 4, the first motor 4 is in a power generation state, the first motor 4 transmits electrical energy to the second motor 5 and the battery, and the second motor 5 is in an electric state; in this mode, the first sun gear II 102 and the second sun gear II 202 are both locked, the second motor 5 directly drives the second sun gear I 201 to rotate, and the power is transmitted to the second planetary carrier 203 to obtain a deceleration torque, and then the power is transmitted to the wheels by the output mechanism; in this mode, when the battery is insufficient, the engine 3 can work to supplement the power supply to ensure the long-distance driving needs of the vehicle.

[0036] In this embodiment, a hybrid mode is also included, and in the hybrid mode: the brake component 6 is disengaged, the clutch component 7 is engaged, the engine 3 is working, the first motor 4 is in a power generation or electric state, and the second motor 5 is in a power generation or electric state; the output power of the engine 3 and the first motor 4 is coupled in the first planetary mechanism 1 and transmitted to the second sun gear II 202 through the first sun gear II 102; the output power of the second motor 5 is coupled with the output power of the engine 3 and the first motor 4 in the second planetary mechanism 2, and finally output through the second planetary carrier 203; in this mode, according to the output power demand of the vehicle, the engine 3, the first motor 4, the second motor 5 and the first The coordinated work of the planetary mechanism 1 ensures that the engine is always in a high-efficiency working range. The principle of coordinated adjustment here is the same as that of the existing single-row planetary gear power split system, that is, by adjusting the torque of the second motor 5 and the speed of the first motor 4, the engine is always in a high-efficiency working range. It will not be repeated here; in this way, the fuel economy in the hybrid mode is guaranteed, and the comprehensive power and economy of the whole vehicle are improved; and because the second motor 5 does not decelerate through the second planetary gear mechanism 2 at this time, it directly drives the wheels to travel, which is suitable for the vehicle's high-speed cruising mode. The engine 3 can have better fuel economy, which is conducive to reducing battery usage and increasing battery life, thereby improving the comprehensive economy of the whole vehicle.

[0037] This embodiment also includes a parking mode, in which: the brake component 6 is engaged, the clutch component 7 is engaged, and the engine 3 can optionally drive the first motor to generate power while the vehicle is parked. In this mode, the vehicle is stationary, and depending on the power reserve, the engine 3 can be started to complete charging, or not started to charge, and only the parking function can be achieved. It is also applicable to plug-in hybrid systems, which use an external charging station for charging. In this mode, due to the engagement of the clutch component 7, brake energy recovery can be better achieved. If the vehicle is in a non-emergency braking situation, the vehicle speed is above a certain limit, and the required torque at this time is less than the maximum braking torque that the second motor 5 can provide, the braking force is entirely provided by the second motor 5, converting mechanical energy into electrical energy and storing it in the battery. If the vehicle is in a non-emergency braking situation, the vehicle speed is above a certain limit, and the required torque at this time is greater than the maximum braking torque that the second motor 5 can provide, a portion of the braking force is provided by the second motor 5, converting mechanical energy into electrical energy and storing it in the battery, while the remaining portion of the braking force is provided by traditional mechanical braking.

[0038] The combination of the above modes effectively improves the vehicle's overall economy and power.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A ringless double planetary gear hybrid system, characterized in that: include: A first planetary gear mechanism (1) includes a first sun gear I (101), a first sun gear II (102), a first planetary carrier (103), and a first planetary gear assembly disposed on the first planetary carrier (103); A second planetary gear mechanism (2) comprises a second sun gear I (201), a second sun gear II (202), a second planetary carrier (203), and a second planetary gear assembly disposed on the second planetary carrier (203), wherein the first sun gear II (102) and the second sun gear II (202) are fixed as a whole; An engine (3), wherein an output end of the engine (3) is drivingly connected to the first planet carrier (103); A first motor (4), wherein an output end of the first motor (4) is drivingly connected to a first sun gear I (101); a second motor (5), wherein an output end of the second motor (5) is drivingly connected to a second sun gear I (201); A brake component (6) for operating the locking or releasing of the first sun gear II (102) and the second sun gear II (202); A clutch component (7) for controlling the connection or separation between the second sun gear I (201) and the second planet carrier (203); An output mechanism, wherein an input end of the output mechanism is transmission-connected to the second planetary carrier (203) and is used to transmit power to the wheels; The first planetary gear assembly includes a first planetary gear I (104) and a first planetary gear II (105) provided on a first planetary carrier (103), the first planetary gear I (104) meshing with the first sun gear I (101), the first planetary gear II (105) meshing with the first planetary gear I (104) and meshing with the first sun gear II (102); the second planetary gear assembly includes a second planetary gear I (204) and a second planetary gear II (205) provided on a second planetary carrier (203), the second planetary gear I (204) meshing with the second sun gear I (201), the second planetary gear II (205) meshing with the second planetary gear I (204) and meshing with the second sun gear II (202); The rotation axes of the first motor (4), the second motor (5), the first planetary carrier (103) and the second planetary carrier (203) are collinear; The first motor (4) is arranged on the front side of the first planetary gear mechanism (1), and the second motor (5) is arranged on the rear side of the second planetary gear mechanism (2); a first input shaft (103a) is coaxially provided on the first planetary carrier (103), and the first input shaft (103a) extends forward and passes through the output shaft of the first motor (4); the first sun gear I (101) is fixedly connected to the output shaft of the first motor (4), and the first input shaft (103a) is transmission-connected to the output end of the engine (3); and the second sun gear I (201) is fixedly connected to the output shaft of the second motor (5).

2. The ringless double planetary gear hybrid system according to claim 1, characterized in that: The output mechanism comprises a power output shaft (8), which is coaxially fixed to the second planetary carrier (203) and extends backward through the output shaft of the second motor (5).

3. The ringless double planetary gear hybrid system according to claim 1, characterized in that: An output gear (203a) is fixedly provided on the second planetary carrier (203), and the output mechanism comprises a transmission gear (10) meshed with the output gear (203a).

4. The ringless double planetary gear hybrid system according to any one of claims 1-2, characterized in that: The output shaft of the engine (3) is coaxially arranged with the first planet carrier (103).

5. The ringless double planetary gear hybrid system according to claim 1, characterized in that: The braking component (6) is a brake, and the clutch component (7) is a clutch.

6. The ringless double planetary gear hybrid system according to claim 1, characterized in that: A torsional vibration damper (9) is provided between the engine (3) and the first planet carrier (103).

7. The ringless double planetary gear hybrid system according to claim 1, characterized in that: The first sun gear II (102) and the second sun gear II (202) are an integrated structure.

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