Gear-ring-free double-planet-row hybrid power system

Abstract

The invention discloses a gear-ring-free double-planet-row hybrid power system which comprises a first planet gear mechanism, a second planet gear mechanism, a third planet gear mechanism, a fourth planet gear mechanism, a fifth planet gear mechanism and a sixth planet gear mechanism. The first planet gear mechanism comprises a first sun gear I, a first sun gear II, a first planet carrier and a first planet gear assembly arranged on the first planet carrier; the second planetary gear mechanism comprises a second sun gear I, a second sun gear II, a second planet carrier and a second planetary gear assembly arranged on the second planet carrier, and the first sun gear II and the second sun gear II are fixed into a whole; the engine is in transmission connection with the first planet carrier; the first motor is in transmission connection with the first sun gear I; the second motor is in transmission connection with the second sun gear I; the brake component is used for controlling locking or releasing of the first sun gear II and the second sun gear II; the clutch component is used for controlling the second sun gear I and the second planet carrier to be combined or separated; the output mechanism is in transmission connection with the second planet carrier; the hybrid power system is simple in structure, and meanwhile the dynamic property and economical efficiency of the vehicle are improved.

Description

Technical Field

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

[0002] In the related technology, the hybrid power system of automobiles realizes the power distribution and convergence through a single or multiple planetary gears, and adjusts the working state of the engine and the motor with more freedom, so as to have better power and economy. However, the current power-dividing hybrid power system generally needs to be equipped with multiple clutches and / or brakes, as well as transmission structures to realize the multi-working modes of the hybrid power system, so as to ensure the adaptability of the vehicle in various driving conditions; at the same time, in order to meet the dynamic requirements such as climbing performance, it is necessary to select a motor with a higher power level, or to set up an additional torque-enhancing structure; these inevitably make the overall structure of the hybrid power system more complex, less compact, and less efficient, which is not conducive to the control of the manufacturing cost of the whole vehicle.

[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 double planetary gear hybrid power system, which has a simple structure and can ensure that the vehicle has good adaptability to driving conditions, thereby helping to improve the power and economy of the vehicle.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ringless double planetary gear hybrid power 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, wherein the first sun gear II and the second sun gear II are fixed as a whole; an engine, wherein the output end of the engine is transmission-connected to the first planetary carrier; a first motor, wherein the output end of the first motor is transmission-connected to the first sun gear I; a second motor, wherein the output end of the second motor is transmission-connected to the second sun gear I; a braking component, used to manipulate the locking or releasing of the first sun gear II and the second sun gear II; a clutch component, used to manipulate the engagement or separation between the second sun gear I and the second planetary carrier; an output mechanism, wherein the input end of the output mechanism is transmission-connected to the second planetary carrier and is 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 planet carrier and the second planet 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 disposed on the second planet 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 arranged 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 gear-ringless double planetary gear hybrid system provided by the present invention can realize 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 whole vehicle layout and reducing the production and manufacturing cost of the whole 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, the power level requirement for the motor can be reduced, 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 whole vehicle; at the same time, this structure does not require a gear ring, which is also conducive to reducing manufacturing costs.

[0017] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can 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-torsion damper; 10-transmission gear; 11-differential. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents 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 in various ways 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, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0022] See also Figure 1-2 In the present embodiment, a ringless double planetary gear hybrid system is disclosed, comprising: a first planetary gear mechanism 1, comprising a first sun gear Ⅰ101, a first sun gear Ⅱ102, a first planet carrier 103 and a first planetary gear assembly arranged on the first planet carrier 103; a second planetary gear mechanism 2, comprising a second sun gear Ⅰ201, a second sun gear Ⅱ202, a second planet carrier 203 and a second planetary gear assembly arranged on the second planet carrier 203, wherein the first sun gear Ⅱ102 and the second sun gear Ⅱ202 are fixed as a whole; an engine 3, wherein the output end of the engine 3 is connected to the first planet carrier 103 by transmission; a first motor 4, wherein the output end of the first motor 4 is connected to the first sun gear Ⅰ101 by transmission; a second motor 5, wherein the output end of the second motor 5 is connected to the second sun gear Ⅰ201 by transmission; a brake component 6, which is used to control the locking or releasing of the first sun gear Ⅱ102 and the second sun gear Ⅱ202, and the brake component 6 is generally a brake; a clutch component 7, The clutch component 7 is used to control the connection or separation between the second sun gear Ⅰ201 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 gear ring 203 and the first inner gear ring 103 can be embedded in a gear ring to form an integrated structure, that is, a gear ring is shared, that is, the first inner gear ring 103 and the second inner gear ring 203 can achieve synchronous rotation; the output mechanism is generally a shaft gear transmission structure, the input end of the shaft gear transmission structure is connected to the second planetary carrier 203, and the output end of the shaft gear transmission structure transmits power to the differential 11, and then to the wheels by the half shaft, and different layout designs can be adopted according to the layout requirements of the whole 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 power system in the above structure can realize the multi-mode operation of the vehicle only through a brake component 6, a clutch component 7 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 cost 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, the power level requirement for the motor can be reduced, which is conducive to the cost control of the whole 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 speed, 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); multiple operating modes (see below for details) 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 whole vehicle; at the same time, this structure does not require a ring gear, which is also conducive to reducing manufacturing costs.

[0024] In this embodiment, the first planetary gear assembly includes a first planetary gear I104 and a first planetary gear II105 disposed on the first planetary carrier 103, the first planetary gear I104 meshes with the first sun gear I101, the first planetary gear II105 meshes with the first planetary gear I104 and meshes with the first sun gear II102; the second planetary gear assembly includes a second planetary gear I204 and a second planetary gear II205 disposed on the second planetary carrier 203, the second planetary gear I204 meshes with the second sun gear I201, the second planetary gear II205 meshes with the second planetary gear I204 and meshes with the second sun gear II202; it can be understood that here the first planetary gear I104 and the first planetary gear II105 can be rotated by the pin structure Installed on the first planetary carrier 103; similarly, the second planetary gear I204 and the second planetary gear II205 can also be rotatably installed on the second planetary carrier 203 through a pin structure; the first sun gear II102 and the second sun gear II202 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 I104 and the first planetary gear II105 are generally evenly distributed along the circumference of the first planetary carrier 103. Set a plurality of; similarly, the second planetary gear I204 and the second planetary gear II205 are generally evenly distributed along the circumference of the second planetary carrier 203. This structural design has good compactness and good stability in power transmission. 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 colinear; by arranging these four coaxially, the overall compactness is good, especially arranging the first motor 4 and the second motor 5 on the same axis, which can effectively reduce the space occupied by the overall system in the lateral direction of the vehicle, which is conducive to adapting to the layout on short-width vehicles and improving the compactness of the vehicle layout.

[0026] In this embodiment, the first motor 4 is arranged at the front side of the first planetary gear mechanism 1, and the second motor 5 is arranged at the rear side of the second planetary gear mechanism 2; the first planetary carrier 103 is coaxially provided with a first input shaft 103a, and the first input shaft 103a extends forward and passes through the output shaft of the first motor 4; the first sun gear I101 is fixedly connected to the output shaft of the first motor 4, and the first input shaft 103a is drivingly connected to the output end of the engine 3; the second sun gear I201 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 are of an integrated structure; it can be understood that the output shaft of the first motor 4 is designed as a hollow shaft for the first input shaft 103a to pass through; the first sun gear Ⅰ101 and the output shaft of the first motor 4 are relatively fixed by a spline connection; 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 by a coupling, a spline connection, etc.; this structural design, through a reasonable layout, further improves the compactness of the system as a whole, and at the same time, the overall transmission chain of the system is short and the meshing parts are few, which is conducive to further reducing power waste and improving the comprehensive 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 are of an integral 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 of an integrated structure, the transmission gear 10 is externally connected to the differential 11, and the differential 11 transmits power to the wheels through the half shaft; the structure has a reasonable layout 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 coaxially with the axis of the first planetary carrier 103, it is beneficial to further improve the compactness of the overall structural arrangement and reduce the space occupied; in particular, the first motor 4, the first planetary gear mechanism 1, the second motor 5 and the second planetary gear mechanism 2 are arranged coaxially, 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 Ⅰ201, and the driven part of the clutch 7 is arranged on the second planetary carrier 203, and the second sun gear Ⅰ201 and the second planetary carrier 203 are connected or separated by controlling the active part and the driven part of the clutch. The brake 6 is connected to the first sun gear Ⅱ102 or the second sun gear Ⅱ202, and the brake 6 can adopt a disc brake. The brake disc of the brake 6 is fixed on the first sun gear Ⅱ102 or the second sun gear Ⅱ202, and the brake caliper part of the brake 6 is arranged on the frame or other fixed structure. 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 torsional vibration damper 9 is provided to improve 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 figure 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 congested urban roads, low-speed driving, and frequent braking, thereby 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 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 increase, 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 is 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 is 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 coordinated adjustment principle here is the same as that of the existing single-row planetary gear power split system, that is, the engine is always in a high-efficiency working range by adjusting the torque of the second motor 5 and the speed of the first motor 4, which will not be repeated here; thereby, 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 slow down through the second planetary gear mechanism 2 at this time, but directly drives the wheels to travel, it is suitable for the vehicle's high-speed cruising mode, and the engine 3 can have better fuel economy, which is beneficial to reduce the use of batteries and increase battery life, thereby improving the comprehensive economy of the whole vehicle.

[0037] In this embodiment, a parking mode is also included, and in the parking mode: the brake component 6 is engaged, the clutch component 7 is engaged, and the engine 3 can selectively drive the first motor to generate power while parking; in this mode, the vehicle is stationary, and according to the power reserve, the engine 3 can be started to complete charging, or the engine 3 can be not started to charge, and only the parking function is realized; it can also be applied to a plug-in hybrid system, and an external charging pile is used for charging; in this mode, due to the engagement of the clutch component 7, braking energy recovery can also be better realized. If the car is in a non-emergency braking situation, the vehicle speed is higher than a certain limit value, 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 all provided by the second motor 5, and the mechanical energy is converted into electrical energy and stored in the battery; if the car is in a non-emergency braking situation, the vehicle speed is higher than a certain limit value, and the required torque at this time is greater than the maximum braking torque that the second motor 5 can provide, a part of the braking force is provided by the second motor 5, and the mechanical energy is converted into electrical energy and stored in the battery, and the other part of the braking force is provided by traditional mechanical braking.

[0038] The combined use of the above modes effectively improves the comprehensive economy and power of the vehicle.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. 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 solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should 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) comprises a first sun gear I (101), a first sun gear II (102), a first planet carrier (103) and a first planetary gear assembly arranged on the first planet carrier (103); A second planetary gear mechanism (2), comprising a second sun gear I (201), a second sun gear II (202), a second planet carrier (203) and a second planetary gear assembly arranged on the second planet 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, the input end of which is drivingly connected to the second planet carrier (203) and is used to transmit power to the wheels.

2. The ringless double planetary gear hybrid system according to claim 1, characterized in that: The first planetary gear assembly comprises a first planetary gear I (104) and a first planetary gear II (105) arranged 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 comprises a second planetary gear I (204) and a second planetary gear II (205) arranged 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).

3. The ringless double planetary gear hybrid system according to claim 2, characterized in that: The rotation axes of the first motor (4), the second motor (5), the first planet carrier (103) and the second planet carrier (203) are collinear.

4. The ringless double planetary gear hybrid system according to claim 3, characterized in that: 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 arranged 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).

5. The ringless double planetary gear hybrid system according to claim 4, 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).

6. The ringless double planetary gear hybrid system according to claim 4, characterized in that: An output gear (203a) is fixedly disposed on the second planet carrier (203), and the output mechanism comprises a transmission gear (10) meshing with the output gear (203a).

7. The ringless double planetary gear hybrid system according to any one of claims 3 to 5, characterized in that: The output shaft of the engine (3) is coaxially arranged with the first planet carrier (101).

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

9. The ringless double planetary gear hybrid system according to any one of claims 1 to 8, characterized in that: A torsional vibration damper (9) is arranged between the engine (3) and the first planet carrier (103).

10. The ringless double planetary gear hybrid system according to any one of claims 1 to 9, characterized in that: The first sun gear II (102) and the second sun gear II (202) are an integrated structure.

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