CN118066279A - Gearbox, control method of gearbox, electronic equipment, storage medium and computer program product - Google Patents

Abstract

The invention discloses a gearbox, a control method of the gearbox, electronic equipment, storage medium and computer program product. The gearbox comprises: the planetary gear mechanism comprises sun gears and planetary gears which are meshed with each other, the driving end of the driving motor is connected with the driving end of the planetary carrier, the planetary gears are sleeved on the planetary carrier output shaft of the planetary carrier, one planetary gear is meshed with the gear ring, the rotating clutch is detachably connected with the gear ring, the gear ring is connected with the output shaft, one side of the rotating clutch is fixedly connected with the output end of the planetary carrier, the other side of the rotating clutch is fixedly connected with the gear ring, one side of each braking clutch is fixedly connected with one sun gear, and the other side of each braking clutch is fixedly connected with the gear box. The invention realizes high integration of the electrically driven gearbox and effectively reduces the overall dimension of the gearbox.

Description

Gearbox, control method of gearbox, electronic equipment, storage medium and computer program product

Technical Field

The present invention relates to the field of vehicle technologies, and in particular, to a transmission, a control method of the transmission, an electronic device, a storage medium, and a computer program product.

Background

The vast majority of passenger cars and commercial cars driven by pure electric vehicles currently use monopole gear reduction boxes, and the monopole gear reduction boxes have simple structures, but under the working conditions of medium and high vehicle speeds, the problems of higher motor rotation speed and smaller motor driving efficiency can occur, and further the endurance mileage of the pure electric vehicles is affected.

For this purpose, the prior art proposes an increased drive gearbox in new energy and in pure electric vehicles. However, existing drive gear box designs in new energy and pure electric vehicles mostly employ parallel shaft type structures like manual (Manual Transmission, MT) gear boxes or multi-gear shift designs using multiple planetary rows like conventional automatic (Automatic Transmission, AT) gear boxes, which are mainly based on the gear boxes of conventional fuel vehicles, with the removal of the engine and the addition of the drive motor and the addition of some clutches to achieve different gear outputs. The gear box has the advantages that the gear box is large in volume and weight and more in parts when the gear box is applied to pure electric driving, and the application range of the gear box on different pure electric vehicle types is limited.

Disclosure of Invention

Based on this, it is necessary to provide a transmission, a control method of a transmission, an electronic device, a storage medium, and a computer program product.

The present invention provides a gearbox comprising: the planetary gear mechanism comprises sun gears and planetary gears which are meshed with each other, a motor rotor of the driving motor is connected with a driving end of the planetary carrier, a plurality of planetary gears are sleeved on a planetary carrier output shaft of the planetary carrier, one planetary gear is meshed with the gear ring, the rotating clutch is detachably connected with the gear ring, one side of the rotating clutch is fixedly connected with an output end of the planetary carrier, the other side of the rotating clutch is fixedly connected with the gear ring, one side of each braking clutch is fixedly connected with one sun gear, and the other side of each braking clutch is fixedly connected with the gear box.

Further, a plurality of the planetary gears are rigidly connected, and the plurality of sets of planetary gear mechanisms include: a first planetary gear mechanism, a second planetary gear mechanism, and a third planetary gear mechanism, wherein the first planetary gear mechanism includes: the first sun gear and the first planet gears are meshed, the second planetary gear mechanism comprises a second sun gear and a second planet gear which are meshed, and the third planetary gear mechanism comprises a third sun gear and a third planet gear which are meshed;

the first planet wheel, the second planet wheel and the third planet wheel are sleeved on the planet carrier output shaft in sequence, and the second planet wheel is meshed with the gear ring.

Still further, the plurality of brake clutches includes: a first brake clutch connected to the first sun gear, a second brake clutch connected to the second sun gear, and a third brake clutch connected to the third sun gear;

The third sun gear rotating shaft of the third sun gear is sleeved on the second sun gear rotating shaft of the second sun gear, the second sun gear rotating shaft is sleeved on the first sun gear rotating shaft of the first sun gear, the first sun gear rotating shaft penetrates through the motor rotor along the axis of the motor rotor of the driving motor, one side of the first braking clutch is fixedly connected with the first sun gear rotating shaft, one side of the second braking clutch is fixedly connected with the second sun gear rotating shaft, and one side of the third braking clutch is fixedly connected with the third sun gear rotating shaft.

Further, the device further comprises a first intermediate shaft gear, a second intermediate shaft gear and a differential gear, wherein the output shaft gear is sequentially meshed with the first intermediate shaft gear, the second intermediate shaft gear and the differential gear.

Still further, the gear ratios of the planetary gear mechanisms of the different groups are different, the gear ratios being the ratio of the number of gears of the sun gear to the number of gears of the planet gears in the same planetary gear mechanism.

The invention provides a control method of a gearbox, which comprises the following steps:

responding to a gear switching request, and acquiring a target gear of the gear switching request;

and controlling the rotary clutch and the braking clutch to be all opened or controlling one of the rotary clutch and the braking clutch to be closed and the rest to be opened according to the target gear.

Further, a plurality of the planetary gears are rigidly connected, and the plurality of sets of planetary gear mechanisms include: a first planetary gear mechanism, a second planetary gear mechanism, and a third planetary gear mechanism, wherein the first planetary gear mechanism includes: the first sun gear and the first planet gears are meshed, the second planetary gear mechanism comprises a second sun gear and a second planet gear which are meshed, and the third planetary gear mechanism comprises a third sun gear and a third planet gear which are meshed;

The plurality of brake clutches includes: a first brake clutch connected to the first sun gear, a second brake clutch connected to the second sun gear, and a third brake clutch connected to the third sun gear;

Said controlling one of said rotating clutch and said braking clutch to be closed and the others to remain open in accordance with said target gear comprises:

If the target gear is a first gear, controlling the rotating clutch to be combined, and controlling the first brake clutch, the second brake clutch and the third brake clutch to be opened; or alternatively

If the target gear is a second gear, controlling the second brake clutch to be combined, and controlling the rotary clutch, the first brake clutch and the third brake clutch to be opened; or alternatively

If the target gear is a third gear, controlling the first brake clutch to be combined, and controlling the rotary clutch, the second brake clutch and the third brake clutch to be opened; or alternatively

And if the target gear is the fourth gear, controlling the third brake clutch to be combined, and controlling the rotary clutch, the first brake clutch and the second brake clutch to be opened.

The present invention provides an electronic device including:

at least one processor; and

A memory communicatively coupled to at least one of the processors; wherein,

The memory stores instructions executable by at least one of the processors to enable the at least one processor to perform a method of controlling a gearbox as described above.

The present invention provides a storage medium storing computer instructions that, when executed by a computer, are operable to perform all the steps of a control method of a gearbox as described hereinbefore.

The present invention provides a computer program product comprising a computer program/instruction which, when executed by a processor, implements a method of controlling a gearbox as described above.

The invention provides a high-integration multi-gear electrically-driven gearbox, which adopts a plurality of groups of planetary gear mechanisms and combines the application of clutches to realize the switching of a plurality of gears. The invention realizes high integration of the electrically driven gearbox and effectively reduces the overall dimension of the gearbox. Meanwhile, only one clutch is combined for each gear shifting, so that the control oil way and circuit design are simplified, the control logic is simple and efficient, the power consumption of the pure electric vehicle is reduced, and the endurance mileage is improved.

Drawings

FIG. 1 is a schematic diagram of a transmission according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a transmission according to an embodiment of the present invention;

FIG. 3 is an exploded view of a transmission according to one embodiment of the present invention;

FIG. 4 is a flowchart illustrating a method of controlling a transmission as described above according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a hardware structure of an electronic device according to the present invention.

Description of the marking

1. A planet carrier; 101. a planet carrier output shaft; 2. a first sun gear; 21. a first sun gear rotation shaft; 3. a first planet; 4. a second sun gear; 41. a second sun gear rotating shaft; 5. a second planet wheel; 6. a third sun gear; 61. a third sun gear rotating shaft; 7. a third planet wheel; 8. a gear ring; 9. an output shaft gear; 10. a first countershaft gear; 11. a second countershaft gear; 12. a differential gear; 13. a driving motor; 131. a motor rotor; 132. a motor stator; 14. a rotating clutch; 15. a first brake clutch; 16. a second brake clutch; 17. a third brake clutch; 18. a gearbox housing; 181. an upper gearbox housing; 182. a lower gearbox housing.

Detailed Description

Specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

As shown in fig. 1 and 2, a transmission according to an embodiment of the present invention includes: the planetary gear mechanism comprises sun gears and planet gears which are meshed with each other, a motor rotor 131 of the driving motor 13 is connected with a driving end of the planet carrier 1, a plurality of planet gears are sleeved on a planet carrier output shaft 101 of the planet carrier 1, one planet gear is meshed with the gear ring 8, the rotating clutch 14 is detachably connected with the gear ring 8, the gear ring 8 is connected with the output shaft gear 9, one side of the rotating clutch 14 is fixedly connected with an output end of the planet carrier 1, the other side of the rotating clutch 14 is fixedly connected with the gear ring 8, and one side of each brake clutch is fixedly connected with one side of the sun gear, and the other side of each brake clutch is fixedly connected with the gear box 18.

The gearbox of the embodiment can be used for electrically driven vehicles, such as new energy and pure electric vehicles. The drive motor 13 is a drive motor of a vehicle for driving the vehicle.

Specifically, the drive motor 13 is rigidly connected to the carrier 1 as an input shaft of the transmission, and a rotary clutch 14 is provided between the carrier 1 and the ring gear 8. The ring gear 8 is the output shaft and transmits torque to the wheels through an output shaft gear 9 on the shaft. The drive motor 13 includes a motor stator 132 and a motor rotor 131.

One side of the rotary clutch 14 is fixedly connected with the output end of the planet carrier 1, and the other side is fixedly connected with the gear ring 8. The rotating clutch 14 is closed, the planetary gear mechanisms are multiple groups, each group of planetary gear mechanism comprises a sun gear and planet gears, the planet gears of the multiple groups of planetary gear mechanisms share the planet carrier output shaft 101 of the planet carrier 1, and the sun gears of the same groups are meshed with the planet gears.

The rotating clutch 14 and the braking clutch are both hydraulic clutches. One side of the rotary clutch 14 is fixedly mounted on the planet carrier 1, and the other side is fixedly mounted on the ring gear 8. One side of each brake clutch is fixedly connected to one sun gear and the other side is fixed to the transmission housing 18. Specifically, the shaft of the sun gear is machined with splines, and the clutch plates are mounted on the spline grooves of the sun gear in such a way as to be connected. The transmission housing 18 includes a transmission upper housing 181 and a transmission lower housing 182.

In some embodiments, the clutches are all multi-plate clutches, and the disc-shaped pistons are pushed to compress the clutch friction plates through high-pressure oil paths connected to the gearbox shell, so that the rotation speeds of two rotating parts are consistent or a certain rotating part is braked, and the separation of the two rotating parts is realized by adopting an internal separation spring. When all clutches are open, the drive motor torque cannot be transferred to the wheels, which corresponds to a neutral state.

In a forward gear or reverse gear, for example, first, second, third or fourth forward gear, only one clutch is closed and the remaining clutches are open.

When the rotary clutch 14 is closed (or called combining), and the other brake clutches are kept open and are not combined, the gear ring 8 and the planet carrier 1 are combined through the rotary clutch 14, the rotation speeds of the gear ring 8 and the planet carrier are the same, analysis is carried out according to the motion relation of the planet gears, at the moment, the gear ring 8 is fixedly connected with the driving motor 13, the rotation speeds of the gear ring 8 and the driving motor are the same, and torque output is transmitted to a vehicle through an output shaft gear.

When the rotating clutch 14 is kept open and not combined, one brake clutch is closed, and the other brake clutches are kept open and not combined, one side of the brake clutch is fixedly connected with a sun gear, and the other side of the brake clutch is fixedly connected with the gearbox shell, so that when the brake clutch is closed, the sun gear connected with the brake clutch and the shell brake to stop rotating, at the moment, the driving motor 13 and the planet carrier 1 drive the planet gears of the same group of planetary gear mechanisms with the sun gear stopped rotating, and drive the meshed gear ring 8, and further, torque is transmitted to the vehicle through the output shaft gear 9 to output torque. And analyzing according to the motion relation of the planetary gears, wherein the rotating speed of the gear ring 8 is different from the rotating speed of the motor input shaft, the rotating speed of the gear ring 8 is smaller than the rotating speed of the motor input shaft, and different gear speed ratios are generated by adjusting the gear numbers of different planetary gears and sun gears. The carrier 1 is rigidly connected to a motor rotor 131, and the motor input shaft is a carrier output shaft 101.

The invention provides a high-integration multi-gear electrically-driven gearbox, which adopts a plurality of groups of planetary gear mechanisms and combines the application of clutches to realize the switching of a plurality of gears. The invention realizes high integration of the electrically driven gearbox and effectively reduces the overall dimension of the gearbox.

As shown in fig. 1 and 2, another embodiment of the present invention is a transmission, comprising: a driving motor 13, a planet carrier 1, a plurality of groups of planetary gear mechanisms, a gear ring 8, an output shaft gear 9, a rotary clutch 14, a plurality of braking clutches, a first intermediate shaft gear 10, a second intermediate shaft gear 11, a differential gear 12 and a transmission housing 18, wherein the driving motor 13, the planet carrier 1, the planetary gear mechanisms, the gear ring 8, the output shaft gear 9, the rotary clutch 14 and the braking clutches are accommodated in the transmission housing 18, each group of planetary gear mechanisms comprises a sun gear and a planet gear meshed with each other, the gear ratios of the planetary gear mechanisms of different groups are different, the gear ratios are the ratio of the number of gears of the sun gear to the number of the planet gears in the same planetary gear mechanism, a motor rotor 131 of the driving motor 13 is connected with the driving end of the planet carrier 1, the plurality of the planet gears are rigidly connected and sleeved on the planet carrier 101 of the planet carrier 1, one of the planet gears is meshed with the gear ring 8, the rotary clutch 14 is detachably connected with the output shaft 8, the other side of the planetary gear ring gear mechanism is fixedly connected with the output shaft 8, the other side of the differential gear mechanism is fixedly connected with the transmission housing 10, and the other side of the output shaft 8 is fixedly connected with the transmission housing 18;

The multiple sets of planetary gear mechanisms include: a first planetary gear mechanism, a second planetary gear mechanism, and a third planetary gear mechanism, wherein the first planetary gear mechanism includes: the first sun gear 2 and the first planet gears 3 are meshed, the second planet gear mechanism comprises a second sun gear 4 and a second planet gear 5 which are meshed, and the third planet gear mechanism comprises a third sun gear 6 and a third planet gear 7 which are meshed;

The first planet wheel 3, the second planet wheel 5 and the third planet wheel 7 are sleeved on the planet carrier output shaft 101 in sequence, and the second planet wheel 5 is meshed with the gear ring 8;

the plurality of brake clutches includes: a first brake clutch 15 connected to the first sun gear 2, a second brake clutch 16 connected to the second sun gear 4, and a third brake clutch 17 connected to the third sun gear 6;

The third sun gear rotating shaft 61 of the third sun gear 6 is sleeved on the second sun gear rotating shaft 41 of the second sun gear 4, the second sun gear rotating shaft 41 is sleeved on the first sun gear rotating shaft 21 of the first sun gear 2, the first sun gear rotating shaft 21 penetrates through the motor rotor 131 along the axis of the motor rotor 131 of the driving motor 13, one side of the first brake clutch 15 is fixedly connected with the first sun gear rotating shaft 21, one side of the second brake clutch 16 is fixedly connected with the second sun gear rotating shaft 41, and one side of the third brake clutch 17 is fixedly connected with the third sun gear rotating shaft 61.

Specifically, the transmission main body structure of the present embodiment includes: the drive motor 13, the planet carrier 1, the first sun gear 2, the first planet gears 3, the second sun gear 4, the second planet gears 5, the third sun gear 6, the third planet gears 7, the ring gear 8, the output shaft gear 9, the first intermediate shaft gear 10, the second intermediate shaft gear 11, the differential gear 12, the rotating clutch 14, the first brake clutch 15, the second brake clutch 16 and the third brake clutch 17. Wherein the drive motor 13 is fixedly connected with the planet carrier 1.

In some embodiments, the drive motor 13 is rigidly connected to the planet carrier 1 as an input shaft for the gearbox.

The transmission of this embodiment includes three sets of gear mechanisms, wherein the first planetary gear mechanism includes: the first sun gear 2 and the first planet gears 3 are meshed, the second planet gear mechanism comprises a second sun gear 4 and a second planet gear 5 which are meshed, and the third planet gear mechanism comprises a third sun gear 6 and a third planet gear 7 which are meshed;

the first planet wheel 3, the second planet wheel 5 and the third planet wheel 7 are sleeved on the planet carrier output shaft 101 in sequence, and the second planet wheel 5 is meshed with the gear ring 8.

Specifically, the three sun gears are respectively meshed with the corresponding three groups of planetary gears on the common planet carrier. And only the gear wheel of the second planet wheel 5 in the middle meshes with the inner gear wheel of the gear ring 8, and the other two planet wheels mesh with the corresponding sun wheel only.

The present embodiment meshes the intermediate second planet with the gear of the ring gear, thereby maintaining overall stability.

The gear ratios of the different sets of planetary gear mechanisms differ, the gear ratios being the ratio of the number of gears of the sun gear to the number of gears of the planet gears in the same planetary gear mechanism.

In some embodiments, the number of teeth of the first planet 3, the number of teeth of the second planet 5 and the number of teeth of the third planet 7 are different; and/or

The number of teeth of the first sun gear 2, the number of teeth of the second sun gear 4, and the number of teeth of the third sun gear 6 are different.

In some embodiments, the gear ratios of the first sun gear 2 and the first planet gears 3, the second sun gear 4 and the second planet gears 5, and the third sun gear 6 and the third planet gears 7 are different.

In practical application, the number of teeth of the three sun gears, the number of teeth of the three planet gears carried on the planet carrier and the number of teeth of the inner side gear of the gear ring 8 can be flexibly adjusted, so that the speed ratio relation of different gears can be adjusted, and the number of teeth of the output shaft gear 9 and the first intermediate shaft gear 10 and the second intermediate shaft gear 11 can be adjusted, so that the final output speed ratio can be adjusted.

The embodiment realizes the speed ratio relation of different gears by arranging the planetary gear mechanisms with different gear ratios.

A rotary clutch 14 is arranged between the planet carrier 1 and the ring gear 8, the ring gear 8 being the output shaft and being meshed with a first intermediate shaft gear 10 via an output shaft gear 9 on the shaft, a second intermediate shaft gear 11 on the intermediate shaft being meshed with a differential gear 12 as the main reduction gear and finally transmitting torque to the wheels.

Wherein, the third sun gear rotation shaft 61 of the third sun gear 6 is sleeved on the second sun gear rotation shaft 41 of the second sun gear 4, the second sun gear rotation shaft 41 is sleeved on the first sun gear rotation shaft 21 of the first sun gear 2, the first sun gear rotation shaft 21 passes through the motor rotor 131 along the axis of the motor rotor 131 of the driving motor 13, one side of the first brake clutch 15 is fixedly connected with the first sun gear rotation shaft 21, one side of the second brake clutch 16 is fixedly connected with the second sun gear rotation shaft 41, and one side of the third brake clutch 17 is fixedly connected with the third sun gear rotation shaft 61.

The three sun gears of the embodiment are coaxially arranged and are designed in a shaft sleeve shaft mode, so that the sun gears can rotate freely. The sun gear and the motor rotor are not connected, the shaft sleeve shaft design is adopted, the motor rotor and the three sun gears are respectively and independently rotated, the sun gears and the motor rotor are not affected, and the motor rotor only drives the planet carrier. In addition, considering the both ends support of axle, pass motor rotor with first sun gear rotation axis for it is more reliable in the design, avoid this axle to become the cantilever structure that mechanical properties is poor. Meanwhile, three sun gears are respectively connected with three braking clutches arranged on the gearbox housing, and the rotation shaft of each sun gear is connected with the braking clutch, so that the braking clutch can control the rotation or braking of the sun gear.

The three groups of planetary gear mechanisms are matched with the rotary clutch and the braking clutch to realize a plurality of gear control.

Specifically, the clutches are all multi-plate clutches, and the disc-shaped pistons are pushed to compress the friction plates of the clutches through high-pressure oil paths connected to the gearbox shell, so that the rotation speeds of two rotating parts are consistent or a certain rotating part is braked, and the separation of the two rotating parts is realized by adopting an internal separation spring. When all clutches are open, the drive motor torque cannot be transferred to the wheels, which corresponds to a neutral state.

In forward or reverse gears, for example, first, second, third or fourth gears of the forward gear, only one clutch is closed and the remaining clutches are open.

The plurality of planets are rigidly connected and, in some embodiments, are integrally cast and fit over the planet carrier output shaft 101.

When the rotary clutch 14 is combined by controlling oil pressure, the other three clutches are kept open and not combined, at the moment, the gear ring 8 and the planet carrier 1 are combined through the rotary clutch 14, the rotation speeds of the gear ring 8 and the planet carrier are the same, the rotation speeds are analyzed according to the motion relation of the planet gears, at the moment, the gear ring 8 is fixedly connected with the driving motor 13, the rotation speeds of the gear ring 8 and the driving motor are the same, the gear ring is meshed with the first intermediate shaft gear 10 through the output shaft gear 9, the second intermediate shaft gear 11 is meshed with the differential gear 12, and torque output is transmitted to a vehicle;

When the second brake clutch 16 is engaged by controlling the oil pressure, at this time, the second sun gear 4 and the transmission housing 18 are braked to stop rotating, and the other three clutches remain open to be disengaged, at this time, the drive motor 13, the carrier 1, and the ring gear 8 are engaged through the second planetary gear 5 and the first intermediate shaft gear 10 through the output shaft gear 9, and the second intermediate shaft gear 11 is engaged with the differential gear 12, and torque output is transmitted to the vehicle. Analyzing according to the motion relation of the planetary gears, wherein the rotating speed of the gear ring 8 is different from the rotating speed of the motor input shaft, and the rotating speed of the gear ring 8 is smaller than the motor input rotating speed to generate a gear speed ratio;

When the first brake clutch 15 is combined by controlling oil pressure, at this time, the first sun gear 2 is braked and stopped rotating with the gearbox housing 18, the other three clutches are kept open and not combined, and as the first planet gear 3, the second planet gear 5 and the third planet gear 7 are rigidly connected, the rotation speeds of the first planet gear 3, the second planet gear 5 and the third planet gear 7 are consistent, after the first sun gear 2 stops rotating, the driving motor 13 and the planet carrier 1 drive the second planet gear 5 through the first planet gear 3, the second planet gear 5 is meshed with the gear ring 8 to drive the gear ring 8, and meshed with the first intermediate shaft gear 10 through the output shaft gear 9, and the second intermediate shaft gear 11 is meshed with the differential gear 12 to transmit torque output to the vehicle to output torque to the outside. Analyzing according to the motion relation of the planetary gears, wherein the rotating speed of the gear ring 8 is different from the rotating speed of the motor input shaft, and the rotating speed of the gear ring 8 is smaller than the motor input rotating speed to generate another gear speed ratio;

When the third brake clutch 17 is combined by controlling oil pressure, at the moment, the third sun gear 6 and the gearbox housing 18 are braked to stop rotating, the other three clutches are kept open and are not combined, at the moment, the driving motor 13 and the planet carrier 1 drive the second planet gears 5 through the third planet gears 7, the second planet gears 5 are meshed with the gear rings 8 to drive the gear rings 8, the second planet gears 5 are meshed with the first intermediate shaft gear 10 through the output shaft gear 9, the second intermediate shaft gear 11 is meshed with the differential gear 12, and torque is transmitted to the vehicle to output torque. And analyzing according to the motion relation of the planetary gears, wherein the rotating speed of the gear ring 8 is different from the rotating speed of the motor input shaft, and the rotating speed of the gear ring 8 is smaller than the motor input rotating speed to generate a gear speed ratio.

The embodiment provides a high-integration multi-gear electrically-driven gearbox, which mainly comprises a group of planetary gear structures, creatively uses a planet carrier structure shared by three groups of planetary gear trains, correspondingly designs three groups of sun gear structures rotating coaxially, and realizes different speed ratio application between input and output by adopting different clutch control strategies in cooperation with the use of four clutches. The three groups of planetary gears are used for sharing the planetary carrier structure, so that the application of the gear ring is greatly reduced, the axial and radial dimensions of the gearbox can be reduced, the volume and weight of the gearbox are reduced, the production cost is further reduced, and the application of the electrically driven gearbox on different vehicle types is expanded.

According to the embodiment, various gears can be provided according to the running working conditions of the electric vehicle, so that optimal gear matching under more vehicle speeds is provided, the motor works in a high-efficiency area, meanwhile, the rotating speed of the driving motor is reduced, and noise and abrasion are reduced. Through innovative planetary gear mechanism design, a plurality of groups of planetary gear mechanisms are integrated on the planet carrier, so that the gear speed ratios can be flexibly adjusted, and the miniaturization and the intensification of the electric drive gearbox are realized. For gear shifting, a mature multi-friction plate type hydraulic drive clutch is adopted, and a planetary gear hardware design is combined, so that compact arrangement of a plurality of clutches can be realized, and meanwhile gear shifting impact of different gears is reduced.

FIG. 4 is a flowchart illustrating a method of controlling a transmission as described above according to an embodiment of the present invention, including:

step S401, responding to a gear switching request, and acquiring a target gear of the gear switching request;

step S402, according to the target gear, controlling the rotating clutch 14 and the braking clutch to be all opened, or controlling one of the rotating clutch 14 and the braking clutch to be closed, and the rest to be opened.

In particular, the invention may be applied to electronic devices having processing capabilities, such as electronic controller units (Electronic Control Unit, ECU) of vehicles.

When a gear switching request is received, step S401 is triggered, and a target gear of the gear switching request is obtained. Step S402 is then executed to control the closing of the rotating clutch 14 and the braking clutch according to the target gear. Specifically, the closing (or referred to as engaging) or opening of the rotary clutch 14, the first brake clutch 15, the second brake clutch 16, and the third brake clutch 17 is controlled.

In some embodiments, the rotating clutch and the braking clutch are each a multiplate clutch. The clutch is closed by pushing a disc-shaped piston to compress a clutch friction plate through a high-pressure oil way connected to the gearbox shell, so that the rotation speeds of two rotating parts are consistent or a certain rotating part is braked. And the opening of the clutch, i.e. the separation of the clutch, is achieved with an internal separation spring.

When the rotary clutch 14 and the brake clutch are all open, the drive motor torque cannot be transmitted to the wheels, which corresponds to a neutral state.

In forward gears, such as first, second, third or fourth gear, only one clutch is closed and the remaining clutches are open.

The invention realizes high integration of the electrically driven gearbox and effectively reduces the overall dimension of the gearbox. Meanwhile, only one clutch is combined for each gear shifting, so that the control oil way and circuit design are simplified, the control logic is simple and efficient, the power consumption of the pure electric vehicle is reduced, and the endurance mileage is improved.

In one embodiment, a plurality of the planetary gears are rigidly connected, and the plurality of sets of planetary gear mechanisms include: a first planetary gear mechanism, a second planetary gear mechanism, and a third planetary gear mechanism, wherein the first planetary gear mechanism includes: the first sun gear 2 and the first planet gears 3 are meshed, the second planet gear mechanism comprises a second sun gear 4 and a second planet gear 5 which are meshed, and the third planet gear mechanism comprises a third sun gear 6 and a third planet gear 7 which are meshed;

the plurality of brake clutches includes: a first brake clutch 15 connected to the first sun gear 2, a second brake clutch 16 connected to the second sun gear 4, and a third brake clutch 17 connected to the third sun gear 6;

Said controlling one of said rotating clutch 14 and said braking clutch to be closed and the other to be left open according to said target gear comprises:

If the target gear is first gear, controlling the rotating clutch 14 to be combined, and controlling the first brake clutch 15, the second brake clutch 16 and the third brake clutch 17 to be opened; or alternatively

If the target gear is a second gear, the second brake clutch 16 is controlled to be combined, and the rotary clutch 14, the first brake clutch 15 and the third brake clutch 17 are controlled to be opened; or alternatively

If the target gear is a third gear, the first brake clutch 15 is controlled to be combined, and the rotary clutch 14, the second brake clutch 16 and the third brake clutch 17 are controlled to be opened; or alternatively

If the target gear is the fourth gear, the third brake clutch 17 is controlled to be engaged, and the rotary clutch 14, the first brake clutch 15, and the second brake clutch 16 are controlled to be opened.

Specifically, the different gear clutch control logic is shown in Table 1, wherein ON indicates clutch closed and OFF indicates clutch open. Only one clutch is engaged in the different forward gears.

It should be noted that, without conflict, the four clutch features provided by the present invention may be combined with each other, and the following detailed description will be given with respect to the four-gear embodiment.

For first gear, the rotary clutch 14 is combined by controlling oil pressure, the other three clutches are kept open and not combined, at the moment, the gear ring 8 and the planet carrier 1 are combined through the rotary clutch 14, the rotation speeds of the gear ring 8 and the planet carrier are the same, analysis is carried out according to the motion relation of the planet gears, at the moment, the gear ring 8 is fixedly connected with the driving motor 13, the rotation speeds of the gear ring 8 and the driving motor are the same, the gear ring 8 is meshed with the first intermediate shaft gear 10 through the output shaft gear 9, the second intermediate shaft gear 11 is meshed with the differential gear 12, and torque output is transmitted to a vehicle;

For second gear, the second brake clutch 16 is combined by controlling oil pressure, at the moment, the second sun gear 4 and the gearbox shell 18 are braked to stop rotating, and the other three clutches are kept open and not combined, at the moment, the driving motor 13, the planet carrier 1 and the gear ring 8 are meshed through the second planet gears 5 and the first intermediate shaft gear 10, the second intermediate shaft gear 11 and the differential gear 12, and torque output is transmitted to the vehicle to output torque. Analyzing according to the motion relation of the planetary gears, wherein the rotating speed of the gear ring 8 is different from the rotating speed of the motor input shaft, and the rotating speed of the gear ring 8 is smaller than the motor input rotating speed to generate a second gear speed ratio;

For three gears, the first brake clutch 15 is combined by controlling oil pressure, at the moment, the first sun gear 2 and the gearbox housing 18 are braked to stop rotating, the other three clutches are kept open and are not combined, at the moment, the driving motor 13 and the planet carrier 1 drive the second planet gears 5 through the first planet gears 3, the second planet gears 5 are meshed with the gear ring 8 to drive the gear ring 8, the second planet gears 5 are meshed with the first intermediate shaft gear 10 through the output shaft gear 9, the second intermediate shaft gear 11 is meshed with the differential gear 12, and torque output is transmitted to the vehicle to output torque. Analyzing according to the motion relation of the planetary gears, wherein the rotating speed of the gear ring 8 is different from the rotating speed of the motor input shaft, and the rotating speed of the gear ring 8 is smaller than the motor input rotating speed to generate a three-gear speed ratio;

for the fourth gear, the third brake clutch 17 is combined by controlling oil pressure, at the moment, the third sun gear 6 and the gearbox housing 18 are braked to stop rotating, the other three clutches are kept open and are not combined, at the moment, the driving motor 13 and the planet carrier 1 drive the second planet gears 5 through the third planet gears 7, the second planet gears 5 are meshed with the gear ring 8 to drive the gear ring 8, the second planet gears 5 are meshed with the first intermediate shaft gear 10 through the output shaft gear 9, the second intermediate shaft gear 11 is meshed with the differential gear 12, and torque output is transmitted to the vehicle to output torque. And analyzing according to the motion relation of the planetary gears, wherein the rotating speed of the gear ring 8 is different from the rotating speed of the motor input shaft, and the rotating speed of the gear ring 8 is smaller than the motor input rotating speed, so that a four-gear speed ratio is generated.

The transmission principle of each gear is as follows:

first gear:

the driving motor 13, the planet carrier 1, the rotary clutch 14, the gear ring 8, the output shaft gear 9, the first intermediate shaft gear 10, the second intermediate shaft gear 11 and the differential gear 12;

Second gear:

the driving motor 13, the planet carrier 1, the second sun gear 4, the second planet gear 5, the gear ring 8, the output shaft gear 9, the first intermediate shaft gear 10, the second intermediate shaft gear 11 and the differential gear 12;

Three-gear shift position:

The driving motor 13, the planet carrier 1, the first sun gear 2, the first planet gear 3, the second planet gear 5, the gear ring 8, the output shaft gear 9, the first intermediate shaft gear 10, the second intermediate shaft gear 11 and the differential gear 12;

Four-gear shift:

The driving motor 13, the planet carrier 1, the third sun gear 6, the third planet gear 7, the second planet gear 5, the gear ring 8, the output shaft gear 9, the first intermediate shaft gear 10, the second intermediate shaft gear 11 and the differential gear 12;

the embodiment provides a specific control method for four gears, which generates different gear ratios of four gears, and multiple gears can provide optimal gear matching under more vehicle speeds, so that a motor works in a high-efficiency area, and meanwhile, the rotating speed of the driving motor is reduced, and noise and abrasion are reduced.

Fig. 5 is a schematic diagram of a hardware structure of an electronic device according to the present invention, including:

At least one processor 501; and

A memory 502 communicatively coupled to at least one of the processors 501; wherein,

The memory 502 stores instructions executable by at least one of the processors to enable the at least one processor to perform a method of controlling a gearbox as described above.

One processor 501 is illustrated in fig. 5.

The electronic device may further include: an input device 503 and a display device 504.

The processor 501, memory 502, input device 503, and display device 504 may be connected by a bus or other means, the connection being illustrated by a bus.

The memory 502 is used as a non-volatile computer readable storage medium for storing non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions/modules corresponding to the control method of the gearbox in the embodiment of the present application, for example, the method flow shown in fig. 4. The processor 501 executes various functional applications and data processing by running nonvolatile software programs, instructions and modules stored in the memory 502, i.e., implements the control method of the transmission in the above-described embodiment.

Memory 502 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of a control method of the transmission, etc. In addition, memory 502 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 502 may optionally include memory located remotely from the processor 501, which may be connected via a network to the means for performing the control method of the gearbox. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 503 may receive input user clicks and generate signal inputs related to user settings and function controls of the control method of the gearbox. The display 504 may include a display device such as a display screen.

The control method of the gearbox in any of the method embodiments described above is performed when executed by the one or more processors 501, in the one or more modules stored in the memory 502.

The invention realizes high integration of the electrically driven gearbox and effectively reduces the overall dimension of the gearbox. Meanwhile, only one clutch is combined for each gear shifting, so that the control oil way and circuit design are simplified, the control logic is simple and efficient, the power consumption of the pure electric vehicle is reduced, and the endurance mileage is improved.

An embodiment of the invention provides a storage medium storing computer instructions that, when executed by a computer, perform all the steps of a method of controlling a gearbox as described hereinbefore.

In the context of this disclosure, a storage medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The storage medium may be a machine-readable signal medium or a machine-readable storage medium. Alternatively, the storage medium may be a non-transitory computer readable storage medium, for example, a ROM, a random access memory (Random Access Memory, RAM), a Compact Disc ROM (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.

An embodiment of the invention provides a computer program product comprising computer programs/instructions which when executed by a processor implement a method of controlling a gearbox as described above.

The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. A gearbox, comprising: the planetary gear mechanism comprises sun gears and planet gears which are meshed with each other, a motor rotor (131) of the driving motor (13) is connected with a driving end of the planet carrier (1), a plurality of brake clutches and a gearbox housing (18), the driving motor (13), the planet carrier (1), the planet gear mechanism, the gear ring (8), the output shaft gear (9), the rotary clutches (14) and the brake clutches are accommodated in the gearbox housing (18), the motor rotor (131) of the driving motor (13) is connected with a driving end of the planet carrier (1), the planet gears are sleeved on a planet carrier output shaft (101) of the planet carrier (1), one of the planet gears is meshed with the gear ring (8), the rotary clutches (14) are detachably connected with the gear ring (8), one side of each of the rotary clutches (14) is fixedly connected with one side of the output carrier (1) and one side of the other of the planet carrier (8), and one side of each of the rotary clutches is fixedly connected with the other side of the planet carrier (8) and the other side of the brake housing.

2. The gearbox of claim 1, wherein a plurality of the planets are rigidly connected, the plurality of sets of planetary gear mechanisms comprising: a first planetary gear mechanism, a second planetary gear mechanism, and a third planetary gear mechanism, wherein the first planetary gear mechanism includes: the first sun gear (2) and the first planet gears (3) are meshed, the second planet gear mechanism comprises a second sun gear (4) and a second planet gear (5) which are meshed, and the third planet gear mechanism comprises a third sun gear (6) and a third planet gear (7) which are meshed;

the first planet wheel (3), the second planet wheel (5) and the third planet wheel (7) are sequentially sleeved on the planet carrier output shaft (101), and the second planet wheel (5) is meshed with the gear ring (8).

3. The transmission of claim 2, wherein the plurality of brake clutches comprises: a first brake clutch (15) connected to the first sun gear (2), a second brake clutch (16) connected to the second sun gear (4), and a third brake clutch (17) connected to the third sun gear (6);

The novel solar energy driving device is characterized in that a third sun gear rotating shaft (61) of the third sun gear (6) is sleeved on a second sun gear rotating shaft (41) of the second sun gear (4), the second sun gear rotating shaft (41) is sleeved on a first sun gear rotating shaft (21) of the first sun gear (2), the first sun gear rotating shaft (21) penetrates through the motor rotor (131) along the axis of a motor rotor (131) of the driving motor (13), one side of the first braking clutch (15) is fixedly connected with the first sun gear rotating shaft (21), one side of the second braking clutch (16) is fixedly connected with the second sun gear rotating shaft (41), and one side of the third braking clutch (17) is fixedly connected with the third sun gear rotating shaft (61).

4. Gearbox according to claim 1, further comprising a first intermediate shaft gear (10), a second intermediate shaft gear (11) and a differential gear (12), the output shaft gear (9) being in mesh with the first intermediate shaft gear (10), the second intermediate shaft gear (11) and the differential gear (12) in sequence.

5. A gearbox according to any of claims 1 to 4, characterised in that the gear ratios of the planetary gear mechanisms of different groups differ, the gear ratios being the ratio of the number of gears of the sun gear and the number of gears of the planet gears in the same planetary gear mechanism.

6. A control method of a transmission according to any one of claims 1 to 5, comprising:

responding to a gear switching request, and acquiring a target gear of the gear switching request;

According to the target gear, the rotary clutch (14) and the braking clutch are controlled to be all opened, or one of the rotary clutch (14) and the braking clutch is controlled to be closed, and the rest is controlled to be opened.

7. The method of claim 6, wherein a plurality of the planetary gears are rigidly connected, and the plurality of sets of planetary gear mechanisms include: a first planetary gear mechanism, a second planetary gear mechanism, and a third planetary gear mechanism, wherein the first planetary gear mechanism includes: the first sun gear (2) and the first planet gears (3) are meshed, the second planet gear mechanism comprises a second sun gear (4) and a second planet gear (5) which are meshed, and the third planet gear mechanism comprises a third sun gear (6) and a third planet gear (7) which are meshed;

the plurality of brake clutches includes: a first brake clutch (15) connected to the first sun gear (2), a second brake clutch (16) connected to the second sun gear (4), and a third brake clutch (17) connected to the third sun gear (6);

Said controlling one of said rotating clutch (14) and said braking clutch to be closed and the other to be left open according to said target gear comprises:

if the target gear is a first gear, controlling the rotating clutch (14) to be combined, and controlling the first brake clutch (15), the second brake clutch (16) and the third brake clutch (17) to be opened; or alternatively

If the target gear is a second gear, the second brake clutch (16) is controlled to be combined, and the rotary clutch (14), the first brake clutch (15) and the third brake clutch (17) are controlled to be opened; or alternatively

If the target gear is a third gear, the first brake clutch (15) is controlled to be combined, and the rotary clutch (14), the second brake clutch (16) and the third brake clutch (17) are controlled to be opened; or alternatively

And if the target gear is the fourth gear, controlling the third brake clutch (17) to be combined, and controlling the rotary clutch (14), the first brake clutch (15) and the second brake clutch (16) to be opened.

8. An electronic device, comprising:

at least one processor; and

A memory communicatively coupled to at least one of the processors; wherein,

The memory stores instructions executable by at least one of the processors to enable the at least one processor to perform the control method of the gearbox of any one of claims 6 to 7.

9. A storage medium storing computer instructions which, when executed by a computer, are adapted to carry out all the steps of the control method of a gearbox according to any one of claims 6 to 7.

10. A computer program product comprising computer programs/instructions which, when executed by a processor, implement a method of controlling a gearbox according to any one of claims 6 to 7.