Six-gear hybrid gearbox and speed changing method

Abstract

The invention discloses a six-gear hybrid gearbox and a speed changing method.The six-gear hybrid gearbox comprises a box body, a main shaft, a first planetary mechanism, a second planetary mechanism, a third planetary mechanism, a motor, a third clutch, a first brake and a second brake, the main shaft is in transmission connection with a first clutch and a second clutch, the first clutch and the second clutch are used for transmitting power of the main shaft, the motor is arranged in the box body, a stator of the motor is connected with the shell, a rotor serves as a rotating part in the box body, and a rotor shaft is connected with the first planet carrier. The size limitation of series connection distribution of two devices is reduced, the space utilization rate of the reduction gearbox and the output power of the motor are increased, the second planetary mechanism serves as a middle component, the first planetary mechanism and the third planetary mechanism are arranged on the two sides of the second planetary mechanism, the supporting length is reduced, the three planetary mechanisms are in mutual linkage, and the mechanism is simple and convenient to machine and install.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to a six-speed hybrid gearbox and a speed shifting method. Background Art

[0002] The gearbox is a common automotive accessory and is generally installed in the car for power transmission.

[0003] Traditional gearboxes mainly use a nine-speed transmission route, which uses at least four planetary mechanisms, and the transmission route and installation structure are complex. Traditional gearboxes are not easy to produce, assemble, install and use. In addition, the transmission relationship of each planetary mechanism in the previous gearbox is connected in series, and the final output power gear is easily affected by axial force. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a six-speed hybrid transmission, which can reduce the influence of the motor size on the axial size of the transmission and simplify the transmission structure.

[0005] The invention also provides a speed changing method.

[0006] A six-speed hybrid transmission according to an embodiment of a first aspect of the present invention comprises a housing, a main shaft, a first planetary mechanism, a second planetary mechanism, a third planetary mechanism, a motor, a third clutch, a first brake, and a second brake, wherein the main shaft is rotatably connected in the housing, and the main shaft is transmission-connected with a first clutch and a second clutch, the first clutch and the second clutch are used to transmit the power of the main shaft, and the main shaft is used to transmission-connect the output shaft of the engine; the first planetary mechanism comprises a first sun gear, a first planetary row, a first planetary carrier, and a first ring gear, the first sun gear is connected to the first clutch, the first planetary row is meshedly connected between the first ring gear and the first sun gear, and the first planetary carrier is connected to the first planetary row; the second planetary mechanism comprises a second sun gear, a second planetary row, a second planetary carrier, and a second ring gear, the second sun gear is connected to the first ring gear, the second planetary row is meshedly connected between the second ring gear and the second sun gear, the second planetary carrier is connected to the second planetary row, and the second planetary carrier is used to transmission-connect The third planetary mechanism comprises a third sun gear, a third planet row, a third planet carrier and a third ring gear, wherein the third sun gear is fixedly connected to the housing, the third planet row is meshedly connected between the third ring gear and the third sun gear, the third planet carrier is connected to the third planet row, the third planet carrier is connected to the first planet carrier, and the second clutch is connected to the third ring gear; the motor is arranged in the housing, and the output end of the motor is connected to the first planet carrier; the third clutch is arranged between the first planet carrier and the first ring gear, one end of the third clutch is connected to the first planet carrier, and the other end of the third clutch is connected to the first ring gear; one end of the first brake is connected to the housing, and the other end of the first brake is connected to the first sun gear, and the first brake is used to brake or release the first sun gear; one end of the second brake is connected to the housing, and the other end of the second brake is connected to the second sun gear, and the second brake is used to brake or release the second sun gear.

[0007] A six-speed hybrid gearbox according to an embodiment of the present invention has at least the following beneficial effects: the motor is arranged in the box body, the motor stator is connected to the shell, and the rotor is used as a rotating component in the box body, so that the motor and the gearbox body are combined into one, reducing the size limitation of the two motors distributed in series, increasing the space utilization rate of the reduction box and the output power of the motor. The present invention adopts a simple planetary mechanism, with the second planetary mechanism as the middle component, and the first planetary mechanism and the third planetary mechanism are arranged on both sides of the second planetary mechanism, reducing the influence of the axial force when outputting power, thereby reducing the influence on the output gear bearing, and the three planetary mechanisms are arranged on both sides of the second planetary mechanism. The mechanisms are interconnected, with the third planetary carrier, the first planetary carrier and the second ring gear connected as a whole, to achieve four driving modes: pure electric, hybrid, continuously variable speed change and direct drive, so as to achieve continuous switching of different modes under different road conditions, greatly improving fuel economy and comfort, with a simple structure and convenient manufacture and installation; in addition, the structure of the six-speed hybrid transmission only uses three simple planetary gear structures, which is simpler in layout, and is also beneficial to the production of parts and components, and is also simpler in implementation. A three-degree-of-freedom system is used, and only two clutches or one brake and one clutch are involved in the engagement each time it works, so the operation is simple and has higher efficiency.

[0008] According to some embodiments of the present invention, the motor and the second ring gear are both connected to an end of the first planetary carrier away from the second planetary mechanism, and an end of the first planetary carrier close to the second planetary mechanism is connected to the third planetary carrier, and the two ends of the first planetary carrier are respectively used to connect corresponding components, so that the force on the first planetary carrier is stable and the mechanical structure strength is stable.

[0009] According to some embodiments of the present invention, the first planetary carrier is connected to the motor via a fourth clutch, and the fourth clutch is used to close or separate the first planetary carrier and the motor. The fourth clutch is provided so that the motor can perform power intervention as needed, thereby reducing the loss caused by the first planetary carrier driving the motor to rotate.

[0010] According to some embodiments of the present invention, the second planetary mechanism is arranged between the first planetary mechanism and the third planetary mechanism.

[0011] According to some embodiments of the present invention, the first planet carrier and the third planet carrier are integrally formed.

[0012] A speed shifting method according to a second aspect of an embodiment of the present invention includes a six-speed hybrid transmission according to the first aspect of the present invention, comprising the following steps: S1, the first clutch is engaged with the main shaft, the second brake brakes the second sun gear, the other clutches are in a disengaged state, and the first brake is in a non-operating state, so as to achieve the transmission of the first gear; S2, the second clutch is engaged with the main shaft, the second brake brakes the second sun gear, the other clutches are in a disengaged state, and the first brake is in a non-operating state, so as to realize the transmission of the second gear ratio; S3, engaging the first clutch and the second clutch with the main shaft, disengaging the other clutches, and disabling the first brake and the second brake to achieve transmission of the third gear ratio; S4, the second clutch and the third clutch are engaged with the main shaft, the other clutches are in a disengaged state, and all brakes are in a non-operating state, so as to achieve transmission of a fourth gear ratio; S5, the first clutch is engaged with the main shaft, the third clutch is engaged with the first planetary carrier and the first ring gear, all brakes are in an inoperative state, and other clutches are in a disengaged state, so as to achieve transmission of a five-speed ratio; S6, the second clutch is engaged with the main shaft, the first brake is in working state, other clutches are in disengaged state, and the second brake is in non-working state, so as to realize the transmission of the sixth gear.

[0013] A speed shifting method according to a third aspect of an embodiment of the present invention includes a six-speed hybrid transmission according to the first aspect of the present invention, comprising the following steps: S1, braking the second sun gear with the second brake, all clutches are in a disengaged state, and the first brake is not working, so as to achieve the transmission of the first gear power of the electric drive; S2, the third clutch is engaged with the main shaft, the other clutches are in a disengaged state, and the second brake is not operated, so as to realize the transmission of the electric drive second gear power; S3, the first brake is engaged, all clutches are in a disengaged state, and the second brake is not working, so as to realize the transmission of the third gear of electric drive.

[0014] A speed shifting method according to a fourth aspect of an embodiment of the present invention includes a six-speed hybrid transmission according to the first aspect of the present invention, comprising the following steps: The first clutch is engaged with the main shaft, the other clutches are in a disengaged state, the first brake and the second brake are not in operation, and the continuously variable speed power transmission is realized.

[0015] A speed change method according to an embodiment of the present invention has at least the following beneficial effects: the present invention adopts a simple planetary mechanism, with the second planetary mechanism as the middle component, the first planetary mechanism and the third planetary mechanism are arranged on both sides of the second planetary mechanism, so as to reduce the influence of axial force when outputting power, thereby reducing the influence on the output gear bearing, and the three planetary mechanisms are linked to each other, with the third planetary carrier, the first planetary carrier and the second gear ring connected as a whole, so as to realize four driving modes of pure electric, hybrid, continuously variable speed change and direct drive, so as to realize continuous switching of different modes under different road conditions, greatly improving fuel economy and comfort; in addition, the structure of the six-speed hybrid transmission only adopts three simple planetary row structures, so it is simpler in layout, and it is also beneficial to the production of parts and components, and it is also simpler in implementation, adopts a three-degree-of-freedom system, and only two clutches or one brake and one clutch are involved in the engagement each time, so the operation is simple, thus having higher efficiency.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is a structural schematic diagram of a six-speed hybrid transmission according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram showing the connection of the planetary mechanisms of a six-speed hybrid gearbox; Figure 3 for Figure 1 A schematic structural diagram of a six-speed hybrid transmission case is shown.

[0018] Box body 100, cooling liquid interlayer 110, inlet 120, outlet 130, heat absorbing sheet 140, copper plate 150, groove 151; Main shaft 200, first clutch 210, second clutch 220; A first sun gear 310, a first planet row 320, a first planet carrier 330, a fourth clutch 331, and a first ring gear 340; A second sun gear 410, a second planet row 420, a second planet carrier 430, a second ring gear 440, and an output gear 450; A third sun gear 510, a third planet row 520, a third planet carrier 530, and a third ring gear 540; The motor 600 , the third clutch 700 , the first brake 800 , and the second brake 900 . DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In the description of the present invention, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0022] Reference Figures 1 to 3 A six-speed hybrid transmission according to an embodiment of the first aspect of the present invention includes a housing 100, a main shaft 200, a first planetary mechanism, a second planetary mechanism, a third planetary mechanism, a motor 600, a third clutch 700, a first brake 800 and a second brake 900.

[0023] The main shaft 200 is rotatably connected in the housing 100. The main shaft 200 is transmission-connected with a first clutch 210 and a second clutch 220. The first clutch 210 and the second clutch 220 are used to transmit the power of the main shaft 200. The main shaft 200 is transmission-connected with the output shaft of the engine. The first planetary mechanism includes a first sun gear 310, a first planet row 320, a first planet carrier 330 and a first ring gear 340. The first sun gear 310 is connected to the first clutch 210. The first planet row 320 is meshed and connected between the first ring gear 340 and the first sun gear 310. The first planet carrier 330 is connected to the first planet row 320. The second planetary mechanism includes a second sun gear 410, a second planet row 420, a second planet carrier 430 and a second ring gear 440. The second sun gear 410 is connected to the first ring gear 340. The second planet row 420 is meshedly connected between the second ring gear 440 and the second sun gear 410. The second planet carrier 430 is connected to the second planet row 420. The second planet carrier 430 is used for transmission connection with the output gear 450. The second ring gear 440 is connected to the first planet carrier 330. The third planetary mechanism includes a third sun gear 510, a third planet row 520, a third planet carrier 530 and a third ring gear 540. The third sun gear 510 is fixedly connected to the housing 100. The third planet row 520 is meshedly connected between the third ring gear 540 and the third sun gear 510. The third planet carrier 530 is connected to the third planet row 520. The third planet carrier 530 is connected to the first planet carrier 330. The second clutch 220 is connected to the third ring gear 540. The motor 600 is disposed in the housing 100, and the output end of the motor 600 is connected to the first planet carrier 330. It can be understood that the housing 100 is used as the installation position of the stator, and the motor rotor is disposed in the housing 100. The motor rotor is disposed in a cylindrical shape to avoid other mechanisms and components; The third clutch 700 is disposed between the first planet carrier 330 and the first ring gear 340 , one end of the third clutch 700 is connected to the first planet carrier 330 , and the other end of the third clutch 700 is connected to the first ring gear 340 ; One end of the first brake 800 is connected to the housing 100 , and the other end of the first brake 800 is connected to the first sun gear 310 . The first brake 800 is used to brake or release the first sun gear 310 . One end of the second brake 900 is connected to the housing 100 , and the other end of the second brake 900 is connected to the second sun gear 410 . The second brake 900 is used to brake or release the second sun gear 410 .

[0024] It should be understood that the motor is arranged in the box body, the box body is used as the stator of the motor 600, and the rotor is used as the rotating component in the box body, so that the motor 600 is integrated with the gearbox body, reducing the size limitation of the two devices in series, increasing the space utilization rate of the reduction box and the output power of the motor. The present invention adopts a simple planetary mechanism, with the second planetary mechanism as the middle component, and the first planetary mechanism and the third planetary mechanism are arranged on both sides of the second planetary mechanism, reducing the influence of the axial force when outputting power, thereby reducing the influence on the bearing of the output gear 450, and the three planetary mechanisms are linked to each other, with the third planetary frame 5 30. The first planetary carrier 330 and the second ring gear 440 are connected as one body to realize four driving modes: pure electric, hybrid, continuously variable transmission and direct drive, so as to realize continuous switching of different modes under different road conditions, greatly improving fuel economy and comfort. The structure is simple and convenient to manufacture and install. In addition, the structure of the six-speed hybrid transmission only uses three simple planetary gear structures, which is simpler in layout, and is also beneficial to the production of parts and components. It is also simpler in implementation. It adopts a three-degree-of-freedom system, and only two clutches or one brake and one clutch are involved in the engagement each time it works. The operation is simple, thus achieving higher efficiency.

[0025] It is understandable that the gearbox can realize 6 engine direct drive gears, 3 pure electric drive gears, and 1 stepless continuous speed change gear, which mainly solves the problem that the transmission route is more complicated and the structure is more complicated when using 9 gears. The gearbox adopts a shorter transmission chain and the structural arrangement is simpler, so it is easier to implement on the whole vehicle; at the same time, because of the shorter transmission chain, its efficiency will be higher. The gearbox uses fewer parts and the price cost is lower than that of general gearboxes, so it can be used on vehicles with lower quality or strict total cost control. Compared with the single-motor hybrid gearbox structure of other structures, the gearbox adopts three simple planetary mechanisms. The first planetary mechanism and the third planetary mechanism supply the planetary carrier, that is, the first planetary carrier and the third planetary carrier are integrated, and they can also be connected to the motor as a whole, and at the same time they are integrated with the second gear ring, and the axial size of the whole gearbox can be greatly reduced, wherein the first gear ring 340 is connected to the second sun gear to achieve tight output. The second planetary carrier 430 is connected to the output gear 450, which can avoid the occurrence of axial force, thereby reducing the influence of axial force on the bearing of the output gear 450.

[0026] It should be noted that the current mainstream hybrid single-motor transmission usually adds a motor between the transmission and the engine, forming a series structure of engine-motor-transmission. The size of the motor is limited by the axial size of the transmission, and the motor cannot be too large, that is, the motor power will also be smaller. This results in a low pure electric operating frequency when the vehicle is driving on a crowded road. Therefore, the motor is set inside the box, and the box is used as a stator connected to the motor 600, and the rotor is used as a rotating part in the box, so that the motor 600 is combined with the transmission body as an integral whole, reducing the size limitation of the series distribution of the two devices and increasing the space utilization of the reduction box and the motor output power.

[0027] It should be understood that a 5-speed gearbox on a hybrid gearbox is realized by using 5 shifting elements, namely 3 clutches and 2 brakes. The first clutch 210 and the second clutch 220 can be connected to the engine, the first brake 800 and the second brake 900 brake the first sun gear 310 and the second sun gear 410 respectively, and the third clutch 700 connects the first ring gear 340 with the first planetary carrier 330.

[0028] Reference Figure 3The inner wall of the box body 100 is provided with a coolant interlayer 110, an inlet 120 and an outlet 130. The coolant interlayer 110 is used to accommodate coolant. The inlet 120 and the outlet 130 are both connected to the coolant interlayer 110. The inlet 120 and the outlet 130 are respectively used to introduce coolant and discharge coolant. The coolant interlayer 110 is convenient for filling coolant, so that the coolant flows on the box body 100 to absorb the heat generated in the box body 100, thereby ensuring the stable operation of the gearbox. It can be understood that the wall thickness of the box body 100 and the thickness of the coolant interlayer 110 can be made according to needs.

[0029] In some embodiments, a heat absorbing sheet 140 is disposed in the box body 100, and the heat absorbing sheets 140 are distributed on the inner wall of the box body 100. A plurality of heat absorbing sheets 140 are disposed, and the plurality of heat absorbing sheets 140 are arranged at intervals. The disposed heat absorbing sheets 140 can increase the inner surface area of ​​the box body 100 and improve the heat absorption efficiency.

[0030] In some embodiments, a copper plate 150 is embedded on one side of the coolant interlayer 110 close to the inner cavity of the box body 100, and the heat absorbing sheet 140 and the copper plate 150 are integrally formed. The copper plate 150 is provided with a plurality of semicircular grooves 151 distributed in a matrix, and the grooves 151 are used to accommodate the coolant. The copper plate 150 is provided to facilitate heat conduction, and the heat absorbing sheet 140 can better absorb heat. The semicircular grooves 151 allow the coolant to enter, forming a plurality of dot matrix liquid bumps, thereby increasing the heat absorption efficiency and the heat dissipation efficiency. It should be noted that the copper plate 150 and the heat absorbing sheet 140 are first installed in the inner layer of the box body 100 by embedding, and the gap is sealed by argon arc welding, and then the outer shell of the box body 100 is packaged by welding to form the coolant interlayer 110.

[0031] It can be understood that in a planetary mechanism, the so-called planetary gear refers to a group of parts composed of multiple planetary gears. This group of parts is called a planetary gear, but in fact, in a planetary mechanism, the sun gear, planetary carrier and ring gear are the main input or output components. One of the three is fixed, and the other two, one is used as input and the other is output. Generally speaking, the planetary carrier is used as output, but this is not entirely true. Even if the planetary carrier is used as input, power transmission can be generated. In addition, two of the three are used as input and the other is used as output. At this time, the output power can be adjusted by adjusting the power ratio of the two inputs, so that stepless speed change can be achieved.

[0032] Reference Figure 1 and Figure 2The motor 600 and the second ring gear 440 are both connected to the end of the first planetary carrier 330 away from the second planetary mechanism, and the end of the first planetary carrier 330 close to the second planetary mechanism is connected to the third planetary carrier 530. The two ends of the first planetary carrier 330 are respectively used to connect corresponding components, so that the force on the first planetary carrier 330 is stable and the mechanical structure strength is stable.

[0033] It can be understood that the planetary mechanism mainly includes a sun gear, a planetary gear, a planetary carrier and an outer ring gear. When the outer ring gear is fixed, the sun gear is driven and the planetary carrier rotates; when the sun gear is fixed, the outer ring gear is driven and the planetary carrier rotates. The planetary carrier generally serves as power output, while the sun gear and the outer ring gear generally serve as power input.

[0034] In some embodiments, the first planetary carrier 330 is connected to the motor 600 through the fourth clutch 331. The fourth clutch 331 is used to close or separate the first planetary carrier 330 and the motor 600. The fourth clutch 331 is set so that the motor can intervene in power as needed to reduce the loss caused by the first planetary carrier 330 driving the motor to rotate. The second planetary mechanism is set between the first planetary mechanism and the third planetary mechanism.

[0035] In some embodiments, a reinforcement block is provided at the connection between the first planetary carrier 330 and the second ring gear 440. The reinforcement block is made of rubber and is used to reinforce the strength of the first planetary carrier 330. The reinforcement block is used to enhance the strength of the first planetary carrier 330 to avoid deformation and damage of the first planetary carrier 330. The first planetary carrier 330 and the third planetary carrier 530 are integrally formed.

[0036] A speed shifting method according to a second aspect of an embodiment of the present invention includes a six-speed hybrid transmission according to the first aspect of the present invention, comprising the following steps: S1, the first clutch 210 is engaged with the main shaft 200, the second brake 900 brakes the second sun gear 410, the other clutches are in a disengaged state, and the first brake 800 is in a non-operating state, so that the power of the engine is transmitted from the main shaft 200 to the output gear 450 through the first clutch 210, the external power is transmitted to the main shaft 200, the main shaft 200 transmits the power to the first sun gear 310 through the first clutch 210, the first sun gear 310 transmits the power to the first planetary carrier 330 connected to the second ring gear 440, the second ring gear 440 and the first planetary carrier 330 rotate synchronously, and since the second sun gear 410 is fixed, the power is directly transmitted from the second ring gear 440 to the output gear 450 through the second planetary carrier 430, and is transmitted to the power output mechanism through the output gear 450, so as to realize the transmission of the first gear; S2, the second clutch 220 is engaged with the main shaft 200, the second brake 900 brakes the second sun gear 410, the other clutches are in a disengaged state, and the first brake 800 is in a non-operating state, so that the engine power is transmitted to the output gear 450 through the second clutch 220, the external power is transmitted to the main shaft 200, and the main shaft 200 transmits the power to the third ring gear 540 through the second clutch 220. Since the third sun gear 510 is fixed, the power passes through the third planetary carrier 530 and the first planetary carrier 330 to the second ring gear 440. Since the second sun gear 410 is fixed by the second brake 900, the power is directly transmitted from the second ring gear 440 to the output gear 450 through the second planetary carrier 430. Finally, the output gear 450 transmits the power to the output mechanism to realize the transmission of the second gear ratio; S3, the first clutch 210 and the second clutch 220 are engaged with the main shaft 200, and the other clutches are in a disengaged state, and the first brake 800 and the second brake 900 are in a non-operating state, so that the engine power is transmitted to the output gear 450 through the first clutch 210 and the second clutch 220 at the same time, and the external power is transmitted to the main shaft 200, and the main shaft 200 transmits part of the power to the first sun gear 310 through the first clutch 210, and the other part of the power is transmitted to the third ring gear 540 through the second clutch 220, and the first sun gear transmits the power to the first planetary gear 320, and the power of the third ring gear 540 is transmitted to the first planetary gear 330 through the third planetary carrier 530, and the two powers are mixed in the first planetary gear and transmitted to the second planetary gear 420 through the first ring gear 340 and the second ring gear 440, and the two powers are mixed and merged in the second planetary gear 420, and then transmitted to the output gear 450 by the second planetary carrier 430, and finally transmitted to the power output mechanism, so as to realize the transmission of the third gear ratio; S4, the second clutch 220 and the third clutch 700 are engaged with the main shaft 200, the other clutches are in a disengaged state, and all brakes are in a non-operating state, so that the engine power is transmitted to the output gear 450 through the second clutch 220, and the engine transmits the power to the third ring gear 540 through the main shaft 200 through the second clutch 220. Since the third clutch 700 is engaged, the first planetary carrier 330 and the first ring gear 340 are engaged as a whole, and since the first planetary carrier 330 and the third planetary carrier 530 are also a whole, the power is transmitted from the third planetary carrier 530 to the first ring gear 340 and the second ring gear 440. Since the first ring gear 340 and the second sun gear 410 are connected as a whole, the power is finally transmitted to the second planetary carrier 430 at the same speed by the second sun gear 410 and the second ring gear 440, and finally transmitted to the power output mechanism through the output gear 450, so as to realize the transmission of the fourth gear ratio; S5, the first clutch 210 is engaged with the main shaft 200, the third clutch 700 is engaged with the first planetary carrier 330 and the first ring gear 340, all brakes are in an inoperative state, and other clutches are in a disengaged state, so that the engine power is transmitted to the output gear 450 after passing through the first clutch 210, the external power is transmitted to the main shaft 200, and the main shaft 200 transmits the power to the first sun gear 310 through the first clutch 210. At this time, the third clutch 700 is working, all parts of the first planetary mechanism and the second planetary mechanism are fixed together, and the power is directly transmitted to the output gear 450 after passing through the first sun gear 310, and finally transmitted to the power output device by the output gear 450, so as to realize the transmission of the five-speed ratio; S6, the second clutch 220 is engaged with the main shaft 200, the first brake 800 is in working state, the other clutches are in disengaged state, and the second brake 900 is in non-working state, so that the engine power is transmitted to the output gear 450 after passing through the second clutch 220. Since the second clutch 220 is working, the power is transmitted to the third ring gear 540 through the second clutch 220. Since the first sun gear 310 is fixed, the power is transmitted to the second ring gear 440 by the third planetary gear, and since the first sun gear 310 is braked, the power is directly transmitted to the output gear 450, and finally transmitted to the output mechanism by the output gear 450, so as to realize the transmission of the sixth gear. S1, the second brake 900 brakes the second sun gear 410, all clutches are in a disengaged state, and the first brake 800 does not work, so that the power of the motor 600 is transmitted to the output gear 450 through the second gear ring 440. The second brake 900 is closed, and the second sun gear 410 is braked. Since the motor 600 is directly connected to the second gear ring 440, the power is directly transmitted to the output gear 450 through the second planetary carrier 430, and finally the output gear 450 transmits the power to the power output mechanism to realize the transmission of the first gear power of the electric drive; S2, the third clutch 700 is engaged with the main shaft 200, the other clutches are in a disengaged state, and the second brake 900 is not working, so that the power of the motor 600 is directly transmitted to the output gear 450. The third clutch 700 is engaged, so that the first planetary mechanism and the second planetary mechanism are fixed together, and the power of the motor 600 can be directly transmitted to the output gear 450 by the second ring gear 440, and finally transmitted to the power output mechanism by the output gear 450, so as to realize the transmission of the second gear power of the electric drive; S3, the first brake 800 is engaged, all clutches are in the disengaged state, and the second brake 900 is not operated, so that the power of the motor 600 is transmitted to the output gear 450 through the second gear ring 440. The motor 600 is connected to the second gear ring 440 and the first planetary carrier 330. Since the first sun gear 310 is fixed, part of the power is transmitted to the second sun gear 410 through the first gear ring 340, and then merged with the power of the second gear ring 440 at the second planetary row 420, and finally transmitted to the output gear 450 by the second planetary carrier 430, and then transmitted to the power output mechanism by the output gear 450, so as to realize the transmission of the third gear of the electric drive; The first clutch 210 is engaged with the main shaft 200, and the other clutches are in a disengaged state. The first brake 800 and the second brake 900 are not working, so that the power of the motor 600 and the engine power are transmitted to the second ring gear 440 through the first ring gear 340 and the main shaft 200 respectively, the external power is transmitted to the main shaft 200, the main shaft 200 is transmitted to the first sun gear 310 through the first clutch 210, the power of the motor 600 is transmitted to the second ring gear 440 and the first planetary carrier 330, the engine power is mixed with a part of the motor 600 in the first planetary mechanism, and transmitted to the second sun gear 410 through the first ring gear 340, the power of the second ring gear 440 and the second sun gear 410 is mixed to the second planetary carrier 430, and transmitted to the output gear 450 through the second planetary carrier 430, and finally transmitted to the power output mechanism by the output gear 450, so as to realize the transmission of continuously variable power.

[0037] It should be understood that the present invention adopts a simple planetary mechanism, with the second planetary mechanism as the middle component, and the first planetary mechanism and the third planetary mechanism are arranged on both sides of the second planetary mechanism to reduce the influence of axial force when outputting power, thereby reducing the influence on the bearing of the output gear 450. The three planetary mechanisms are linked to each other, with the third planetary carrier 530, the first planetary carrier 330 and the second ring gear 440 connected as a whole, to achieve four driving modes of pure electric, hybrid, continuously variable speed change and direct drive, so as to achieve continuous switching of different modes under different road conditions, greatly improving fuel economy and comfort; in addition, the structure of the six-speed hybrid transmission only uses three simple planetary row structures, so it is simpler in layout, and it is also beneficial to the production of parts and components, and it is also simpler in implementation. It adopts a three-degree-of-freedom system, and only two clutches or one brake and one clutch are involved in the engagement each time it works, so the operation is simple and has higher efficiency.

[0038] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A six-speed hybrid gearbox, characterized in that: include: box(100); A main shaft (200) is rotatably connected in the housing (100), and a first clutch (210) and a second clutch (220) are transmission-connected to the main shaft (200); A first planetary mechanism, comprising a first sun gear (310), a first planet row (320), a first planet carrier (330) and a first ring gear (340), wherein the first sun gear (310) is connected to the first clutch (210), the first planet row (320) is meshedly connected between the first ring gear (340) and the first sun gear (310), and the first planet carrier (330) is connected to the first planet row (320); A second planetary mechanism, comprising a second sun gear (410), a second planet row (420), a second planet carrier (430) and a second ring gear (440), wherein the second sun gear (410) is connected to the first ring gear (340), the second planet row (420) is meshedly connected between the second ring gear (440) and the second sun gear (410), the second planet carrier (430) is connected to the second planet row (420), the second planet carrier (430) is used for transmission connection to an output gear (450), and the second ring gear (440) is connected to the first planet carrier (330); A third planetary mechanism, comprising a third sun gear (510), a third planet row (520), a third planet carrier (530) and a third ring gear (540), wherein the third sun gear (510) is fixedly connected to the housing (100), the third planet row (520) is meshedly connected between the third ring gear (540) and the third sun gear (510), the third planet carrier (530) is connected to the third planet row (520), the third planet carrier (530) is connected to the first planet carrier (330), and the second clutch (220) is connected to the third ring gear (540); A motor (600) is arranged in the housing (100), and an output end of the motor (600) is connected to the first planet carrier (330); A third clutch (700) is arranged between the first planet carrier (330) and the first ring gear (340), one end of the third clutch (700) is connected to the first planet carrier (330), and the other end of the third clutch (700) is connected to the first ring gear (340); A first brake (800), one end of which is connected to the housing (100), and the other end of which is connected to the first sun gear (310), and the first brake (800) is used to brake or release the first sun gear (310); A second brake (900) has one end connected to the housing (100), and the other end of the second brake (900) is connected to the second sun gear (410). The second brake (900) is used to brake or release the second sun gear (410).

2. A six-speed hybrid gearbox according to claim 1, characterized in that: The motor (600) and the second ring gear (440) are both connected to an end of the first planet carrier (330) away from the second planetary mechanism, and an end of the first planet carrier (330) close to the second planetary mechanism is connected to the third planet carrier (530).

3. A six-speed hybrid transmission according to claim 1, characterized in that: The first planet carrier (330) is connected to the motor (600) via a fourth clutch (331), and the fourth clutch (331) is used to close or separate the first planet carrier (330) and the motor (600).

4. A six-speed hybrid transmission according to claim 1, characterized in that: The second planetary mechanism is disposed between the first planetary mechanism and the third planetary mechanism.

5. The six-speed hybrid transmission according to claim 1, characterized in that: The first planet carrier (330) and the third planet carrier (530) are integrally formed.

6. A speed changing method, characterized in that: The six-speed hybrid transmission according to any one of claims 1 to 5 is used, comprising the following steps: S1, the first clutch (210) is engaged with the main shaft (200), the second brake (900) brakes the second sun gear (410), the other clutches are in a disengaged state, and the first brake (800) is in a non-operating state, so as to achieve transmission of a first gear ratio; S2, the second clutch (220) is engaged with the main shaft (200), the second brake (900) brakes the second sun gear (410), the other clutches are in a disengaged state, and the first brake (800) is in a non-operating state, so as to achieve transmission of a second gear ratio; S3, engaging the first clutch (210) and the second clutch (220) with the main shaft (200), while the other clutches are in a disengaged state, and the first brake (800) and the second brake (900) are in a non-operating state, so as to achieve transmission of a third gear ratio; S4, engaging the second clutch (220) and the third clutch (700) with the main shaft (200), disengaging the other clutches, and disengaging all brakes, so as to achieve transmission of a four-speed ratio; S5, the first clutch (210) is engaged with the main shaft (200), the third clutch (700) is engaged with the first planetary carrier (330) and the first ring gear (340), all brakes are in a non-operating state, and other clutches are in a disengaged state, so as to achieve transmission of a five-speed ratio; S6, the second clutch (220) is engaged with the main shaft (200), the first brake (800) is in a working state, the other clutches are in a disengaged state, and the second brake (900) is in a non-working state, so as to achieve transmission of the sixth gear.

7. A speed changing method, characterized in that: The six-speed hybrid transmission according to any one of claims 1 to 5 is used, comprising the following steps: S1, braking the second sun gear (410) with the second brake (900), with all clutches in a disengaged state and the first brake (800) not operating, so as to achieve transmission of electric drive first gear power; S2, the third clutch (700) is engaged with the main shaft (200), the other clutches are in a disengaged state, and the second brake (900) is not operated, so as to achieve transmission of electric drive second gear power; S3, the first brake (800) is engaged, all clutches are in a disengaged state, and the second brake (900) is not operated, so as to achieve the transmission of the third gear of the electric drive.

8. A speed changing method, characterized in that: The six-speed hybrid transmission according to any one of claims 1 to 5 is used, comprising the following steps: the first clutch (210) is engaged with the main shaft (200), the other clutches are in a disengaged state, the first brake (800) and the second brake (900) are not in operation, so as to realize the transmission of continuously variable power.

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