Active shunting differential mechanism and automobile

Abstract

The utility model discloses an active shunting differential mechanism and an automobile. The active shunting differential mechanism comprises a differential assembly, an active shunting assembly and a reverse transmission device, by applying reverse speed comparison of output shafts on the two sides of the differential mechanism and controlling a speed differential value after comparison, power split output by the differential mechanism is adjusted, and active differential output of the differential mechanism is achieved. When the active shunting assembly does not work, the differential mechanism is in a normal differential state, and when the active shunting device works, the differential mechanism is in an active power shunting state, so that active differential output of the differential mechanism is realized, and the requirements of an automobile on active steering, skid resistance, turning radius reduction and turning track control are met; when the active shunting differential mechanism is used for front and rear drive of a four-wheel drive vehicle, the vehicle can turn around in situ.

Description

Technical Field

[0001] The utility model relates to the technical field of differentials, and more specifically to an active split differential and a car. Background Art

[0002] The differential is an important component to ensure the driving of the car, and plays an important role in the safe driving and direction control of the car. With the improvement of driving safety and steering control requirements, the requirements for active differential control are further improved. At the same time, the advancement of automatic assisted driving technology has put forward higher requirements for active differential control; the differential is usually composed of a planetary carrier, planetary gears, output gears and half shafts. The meshing of the planetary gears and the output gears can realize the differential function of the left and right wheel ends of the car, and then realize the normal driving of the car.

[0003] However, the existing differential can only realize the differential function of the car, but cannot realize the active differential function of the car wheels, and cannot meet the car's working requirements in anti-skid, traction control, reducing turning radius, better tracking performance on curves, and turning on the spot.

[0004] Therefore, providing an active split differential and a vehicle is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the utility model provides an active split differential and a vehicle, which can realize active differential output of the differential to meet the working requirements of the vehicle in active steering, anti-skid, reducing turning radius, turning trajectory control and turning on the spot.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An active split differential comprises:

[0008] A differential assembly, the differential assembly comprising a first planetary gear assembly and a first half shaft and a second half shaft connected to two output ends of the first planetary gear assembly;

[0009] An active flow splitter assembly, the active flow splitter assembly comprising a second planetary gear assembly and a third half shaft and a fourth half shaft connected to two output ends of the second planetary gear assembly;

[0010] A reverse transmission device, the reverse transmission device comprising a reverse transmission assembly and a same-direction transmission assembly, the first half-shaft and the third half-shaft located on the same side are respectively connected in transmission via the reverse transmission assembly, and the second half-shaft and the fourth half-shaft located on the same side are respectively connected in transmission via the same-direction transmission assembly;

[0011] A first power drive device and a second power drive device, wherein the first power drive device is drivingly connected to the first planetary gear assembly, and the second power drive device is drivingly connected to the second planetary gear assembly.

[0012] By adopting the above technical solution, the beneficial effects of the utility model are:

[0013] When the active shunt component is not working, the differential is in a differential state. When the active shunt device is working, the differential is in an active power shunt state, thereby realizing active differential output of the differential to meet the vehicle's needs for active steering, anti-skid, reducing turning radius and turning trajectory control.

[0014] Furthermore, the first planetary gear assembly includes a first driving gear, a first driven gear, a first planet carrier housing, a first planetary gear, a first output gear and a second output gear, the first driven gear is meshed and transmission-connected with the first driving gear, the driving driving gear on the output shaft of the first power drive device is meshed and transmission-connected with the first input driven gear, the first input driven gear and the first driving gear share the same rotation axis and are connected as a whole; the first driven gear is fixed to the first planet carrier housing by bolts; a plurality of the first planetary gears are mounted on the first planet carrier housing through the first planetary gear shaft and rotate around the first planetary gear shaft; the first output gear is mounted on the first half shaft on the same rotation axis and connected by a spline, the second output gear is mounted on the second half shaft on the same rotation axis and connected by a spline; the first output gear and the second output gear are respectively meshed and transmission-connected with the first planetary gears.

[0015] Furthermore, the second planetary gear assembly includes a second driving gear, a second driven gear, a second planetary carrier housing, a second planetary gear, a third output gear and a fourth output gear, the second driven gear is meshed and transmission-connected with the second driving gear, the driving driving gear on the output shaft of the second power drive device is meshed and transmission-connected with the second input driven gear, the second input driven gear and the second driving gear share the same rotation axis and are connected as a whole; the second driven gear is fixed to the second planetary carrier housing by bolts; a plurality of second planetary gears are mounted on the second planetary carrier housing through a second planetary gear shaft and rotate around the second planetary gear shaft; the third output gear is mounted on the third half shaft on the same rotation axis and is connected through a spline, the fourth output gear is mounted on the fourth half shaft on the same rotation axis and is connected through a spline; the third output gear and the fourth output gear are respectively meshed and transmission-connected with the second planetary gears.

[0016] Furthermore, the reverse transmission assembly includes a first reverse transmission gear and a second reverse transmission gear, the first reverse transmission gear is mounted on the shaft journal of the first planetary carrier housing and is connected to the external spline on the first half-shaft through the internal spline of the first fixed plate, and the rotation axis of the first reverse transmission gear coincides with the rotation axis of the first half-shaft, the second reverse transmission gear is mounted on the shaft journal of the second planetary carrier housing and is connected to the external spline of the third half-shaft through the internal spline of the second fixed plate, and the rotation axis of the second reverse transmission gear coincides with the rotation axis of the third half-shaft, the first reverse transmission gear and the second reverse transmission gear are meshed for transmission and have the same outer diameter and number of teeth; the first fixed plate and the first reverse transmission gear are fixedly connected by bolts, the second fixed plate and the second reverse transmission gear are fixedly connected by bolts, a retaining spring groove is provided in the spline hole in the second fixed plate, a retaining spring is installed in the retaining spring groove to limit the axial movement of the third half-shaft.

[0017] Furthermore, the same-direction transmission assembly includes a first same-direction transmission gear, a second same-direction transmission gear, an intermediate shaft and an intermediate gear, the first same-direction transmission gear is installed on the journal of the first planetary carrier housing and is connected to the second half-shaft external spline through the third fixed plate internal spline, and the rotation axis of the first same-direction transmission gear coincides with the rotation axis of the second half-shaft; the second same-direction transmission gear is installed on the journal of the second planetary carrier housing and is connected to the fourth half-shaft external spline through the fourth fixed plate internal spline, and the rotation axis of the second same-direction transmission gear coincides with the rotation axis of the fourth half-shaft; the third fixed plate and the first same-direction transmission gear The fourth fixing plate and the second co-directional transmission gear are fixedly connected by bolts, a retaining ring groove is provided in the spline hole of the fourth fixing plate, a retaining ring groove is installed in the retaining ring groove to limit the axial movement of the fourth semi-shaft; the intermediate shaft is rotatably installed on the automobile body through the bearing seat, the intermediate shaft is located between the second semi-shaft and the fourth semi-shaft, and the intermediate shaft, the second semi-shaft and the fourth semi-shaft are parallel and arranged in a triangle; the intermediate gear is rotatably installed on the intermediate shaft and positioned by the retaining ring; the first co-directional transmission gear and the second co-directional transmission gear have the same outer diameter and number of teeth and are respectively meshed with the intermediate gear for transmission.

[0018] Furthermore, the first fixing plate and the first semi-shaft, the second fixing plate and the third semi-shaft, the third fixing plate and the second semi-shaft, and the fourth fixing plate and the fourth semi-shaft are all spline-connected.

[0019] Furthermore, the journal of the intermediate shaft, the right journal of the first planetary carrier housing and the right journal of the second planetary carrier housing are connected together through a first bearing seat with two mounting semicircular holes and one shaft hole, and the journal of the intermediate shaft, the left journal of the first planetary carrier housing and the left journal of the second planetary carrier housing are connected together through a second bearing seat with two mounting semicircular holes and one shaft hole; the first input driven gear and the first driving gear connected as one, as well as the second input driven gear and the second driving gear connected as one, are installed on the intermediate shaft and have the same rotation axis and are arranged between the two bearing seats.

[0020] Furthermore, the length of the right journal of the first planetary carrier housing is greater than the sum of the width of the mounting hole of the first bearing seat and the width of the first co-directional transmission gear; the length of the right journal of the second planetary carrier housing is greater than the sum of the width of the mounting hole of the first bearing seat and the width of the second co-directional transmission gear; the length of the left journal of the first planetary carrier housing is greater than the sum of the width of the mounting hole of the second bearing seat and the width of the first reverse transmission gear; the length of the left journal of the second planetary carrier housing is greater than the sum of the width of the mounting hole of the second bearing seat and the width of the second reverse transmission gear.

[0021] Furthermore, retaining spring grooves are provided between the two sides of the first reverse transmission gear and the shaft journal of the first planet carrier housing, between the second reverse transmission gear and the shaft journal of the second planet carrier housing, between the two sides of the first unidirectional transmission gear and the shaft journal of the first planet carrier housing, and between the two sides of the second unidirectional transmission gear and the shaft journal of the second planet carrier housing, and retaining spring grooves are installed in the retaining spring grooves; the first input driven gear and the first driving gear connected as one, and the second input driven gear and the second driving gear connected as one, are provided with retaining spring grooves on both sides of the intermediate shaft on which they are installed, and retaining spring grooves are installed in the retaining spring grooves.

[0022] A vehicle comprises an active split differential as described above.

[0023] By adopting the above technical solution, the beneficial effects of the utility model are:

[0024] While realizing the normal differential driving function of the car, it can also realize the function of active differential, improving the car's escape from trouble, body motion trajectory adjustment, steering and passing ability and fuel economy.

[0025] Through the above technical scheme, it can be known that the utility model discloses an active split differential and a car. Compared with the prior art, the utility model, under the action of driving force, drives the first half shaft and the second half shaft of the car through the first planetary gear assembly of the differential assembly to realize the normal differential driving function of the car, wherein the first half shaft drives the third half shaft of the active split assembly to rotate in the opposite direction at a relatively constant speed through the reverse transmission assembly, and the second half shaft drives the fourth half shaft to rotate in the same direction at a relatively constant speed through the same direction transmission assembly; in this way, when the car is traveling in a straight line, the first output gear and the second output gear of the differential assembly rotate in the same direction at a constant speed, and the third output gear and the fourth output gear of the active split assembly rotate in the opposite direction at a constant speed through the drive of the reverse transmission assembly. At this time, the second planetary gear of the active split assembly only rotates on its own but does not revolve around the sun, and the planetary gear is connected to the planetary carrier housing via the planetary gear shaft. The revolution speed of the planet carrier case is the planet carrier case speed, and the speed of the second planet carrier case of the active diversion component is zero, which is in a zero-motion state; when the car turns, the first output gear and the second output gear of the differential component rotate in the same direction at a differential speed, and the third output gear and the fourth output gear of the active diversion component rotate at a differential speed and in the opposite direction through the drive of the reverse transmission component. At this time, the second planetary gear of the active diversion component has both self-rotation and revolution, and the planetary gear is connected to the planet carrier case through the planetary gear shaft. The revolution speed of the planetary gear is the planet carrier case speed, and the speed of the second planet carrier case is not zero, and is in a follow-up state; its speed is the difference between the rotation speeds of the first output gear and the second output gear of the differential component, and the steering direction and steering angle of the car are respectively positively correlated with the speed difference (i.e., the speed of the second planet carrier case), and the greater the steering angle of the car, the greater the speed of the speed difference (i.e., the second planet carrier case).

[0026] On this basis, when the active split differential is used for the front and rear drive of a four-wheel drive vehicle, or for a single front drive or single rear drive, when the car is traveling in a straight line, the speed of the second planetary carrier housing is zero and is in a zero-motion state, thereby reducing the resistance and drag torque of the car and improving the fuel economy of the car; when the active split differential is working, no mechanical or hydraulic friction plate clutch is used as an actuator for operation control, thereby reducing the cost of automobile manufacturing and maintenance and improving the economy and service life of the car; when the wheels of the car are trapped, slipping, or the body movement trajectory is adjusted, or the car is in a state of small turning radius or difficult parking, the active split differential can be put into an active differential state, at which time the active split component makes the speed of the first half shaft and the second half shaft in an active differential state through a reverse transmission component, thus, on the one hand, the car's ability to escape from trouble or adjust the body movement trajectory is improved, and on the other hand, a special rear wheel deflection mechanism set to solve the problem of small turning radius or difficult parking of the car is avoided.

[0027] When the active split differential is used for the front and rear drive of the car, when the drive of the differential assembly is in an inoperative state or in an operative state, the third and fourth semi-axles are driven by the active split assembly to rotate at the same speed, and the first and second semi-axles are driven by the reverse transmission assembly to be in an active differential or even reverse state, thereby realizing the function of turning around on the spot of the car, thus improving the steering and passing ability of the car; the steering direction and steering angle of the car are respectively positively correlated with the speed difference (i.e., the speed of the second planetary carrier housing), and also lay a structural foundation for the intelligent differential and wire-controlled chassis, and the steering function of the car can be realized through four-wheel active differential control. On the one hand, it avoids the risk of limping caused by a single drive failure in the distributed four-wheel electric drive, and on the other hand, it also avoids the high cost and complex electro-hydraulic control device of the mechanical four-wheel drive car and the high cost and complex differential mechanical control of the front and rear axle torque connected by the mechanical transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] Figure 1 The accompanying drawing is a schematic diagram of the overall structure of an active split differential provided by the utility model;

[0030] Figure 2 The accompanying drawing is an exploded view of an active split differential provided by the utility model;

[0031] Figure 3 The accompanying drawing is a schematic diagram of the working principle of an active split differential provided by the utility model. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1-3As shown, an embodiment of the utility model discloses an active split differential, comprising a differential assembly 1, an active split assembly 2, a reverse transmission device 3 and a first power drive device and a second power drive device, wherein the differential assembly 1 comprises a first planetary gear assembly 11 and a first half shaft 12 and a second half shaft 13 connected to two output ends of the first planetary gear assembly 11; the active split assembly 2 comprises a second planetary gear assembly 21 and a third half shaft 22 and a fourth half shaft 23 connected to two output ends of the second planetary gear assembly 21; the reverse transmission device 3 comprises a reverse transmission assembly 31 and a same-direction transmission assembly 32, the first half shaft 12 and the third half shaft 22 located on the same side are transmission-connected through the reverse transmission assembly 31, and the second half shaft 13 and the fourth half shaft 23 located on the same side are transmission-connected through the same-direction transmission assembly 32; the first power drive device is transmission-connected to the first planetary gear assembly 11, and the second power drive device is transmission-connected to the second planetary gear assembly 21. In this embodiment, the first power drive device is a motor or an engine, and the second power drive device is a motor. In the utility model, when the active shunt component 2 is not working, the differential is in a differential state, and when the active shunt component 2 is working, the differential is in an active power shunt state, thereby realizing active differential output of the differential to meet the needs of the vehicle in active steering, anti-skid, reducing turning radius and turning trajectory control.

[0034] Specifically, the first planetary gear assembly 11 includes a first driving gear 111, a first driven gear 112, a first planet carrier housing 113, a first planetary gear 114, a first output gear 115 and a second output gear 116. The first driven gear 112 is meshed and transmission-connected with the first driving gear 111. The driving driving gear on the output shaft of the first power drive device is meshed and transmission-connected with the first input driven gear 118. The first input driven gear 118 and the first driving gear 111 have the same rotation axis and are connected as a whole, thereby realizing a two-stage reduction transmission, avoiding the use of a large gear and interfering with the active diverter assembly, reducing the volume, weight and cost at the same time; the first driven gear 112 is fixed on the first planet carrier housing 113; The first planetary gears 114 are mounted on the first planetary carrier housing 113 through the first planetary gear shaft 117 and rotate around the first planetary gear shaft 117; the first output gear 115 is mounted on the same rotation axis of the first half shaft 12 and is connected through a spline, and the second output gear 116 is mounted on the same rotation axis of the second half shaft 13 and is connected through a spline; the first output gear 115 and the second output gear 116 are respectively meshed and transmission-connected with the first planetary gear 114. When working, the first power drive device drives the first half shaft 12 and the second half shaft 13 of the vehicle through the first planetary gear assembly 11, and the outer ends of the first half shaft 12 and the second half shaft 13 are connected to the wheels (front wheels or rear wheels) of the vehicle, so as to realize the normal differential driving function of the vehicle.

[0035] Specifically, the second planetary gear assembly 21 includes a second driving gear 211, a second driven gear 212, a second planet carrier housing 213, a second planetary gear 214, a third output gear 215 and a fourth output gear 216. The second driven gear 212 is meshed and transmission-connected with the second driving gear 211. The driving driving gear on the output shaft of the second power drive device is meshed and transmission-connected with the second input driven gear 218. The second input driven gear 218 is connected to the second driving gear 211 as a whole, thereby realizing a two-stage reduction transmission, avoiding the use of a large gear, and reducing the size. While reducing the size, it also reduces weight and costs; the second driven gear 212 is fixed on the second planetary carrier housing 213; a plurality of second planetary gears 214 are mounted on the second planetary carrier housing 213 through the second planetary gear shaft 217 and rotate around the second planetary gear shaft 217; the third output gear 215 is mounted on the third half shaft 22 with the same rotation axis and connected through a spline, and the fourth output gear 216 is mounted on the fourth half shaft 23 with the same rotation axis and connected through a spline; the third output gear 215 and the fourth output gear 216 are respectively meshed and transmission-connected with the second planetary gears 214.

[0036] It should be noted that the second planetary gear assembly 21 includes but is not limited to the above structure, and can also be other similar planetary gear mechanism components that realize differential functions, such as spur gear planetary gear differential mechanisms, stepped planetary gear differential mechanisms, etc., which can realize differential functions, all of which are within the protection scope of the present utility model.

[0037] Specifically, the reverse transmission assembly 31 includes a first reverse transmission gear 311 and a second reverse transmission gear 312. The first reverse transmission gear 311 is installed on the journal of the first planetary carrier housing 113 and is connected to the external spline on the first half shaft 12 through the internal spline of the first fixed plate, and the rotation axis of the first reverse transmission gear 311 coincides with the rotation axis of the first half shaft 12. The second reverse transmission gear 312 is installed on the journal of the second planetary carrier housing 213 and is connected to the external spline of the third half shaft 22 through the internal spline of the second fixed plate, and the rotation axis of the second reverse transmission gear 312 coincides with the rotation axis of the first half shaft 12. The rotation axes of the three semi-axles 22 coincide, and the first reverse transmission gear 311 and the second reverse transmission gear 312 are meshed and transmitted, and have the same outer diameter and number of teeth. In this way, when the first reverse transmission gear 311 and the second reverse transmission gear 312 are meshed and transmitted, the first semi-axle 12 and the third semi-axle 22 rotate in opposite directions at the same speed; the first fixed plate and the first reverse transmission gear 311 are fixedly connected by bolts, and the second fixed plate and the second reverse transmission gear 312 are fixedly connected by bolts. A retaining ring groove is provided in the spline hole in the second fixed plate, and a retaining ring is installed in the retaining ring groove to limit the axial movement of the third semi-axle 22. The above is only one form of reverse transmission, and other forms of reverse transmission are also included in the scope of the principle of the utility model.

[0038] Specifically, the same-direction transmission assembly 32 includes a first same-direction transmission gear 321, a second same-direction transmission gear 322, an intermediate shaft 323 and an intermediate gear 324. The first same-direction transmission gear 321 is installed on the journal of the first planetary carrier housing 113 and is connected to the external spline of the second half shaft 13 through the internal spline of the third fixed plate, and the rotation axis of the first same-direction transmission gear 321 coincides with the rotation axis of the second half shaft 13; the second same-direction transmission gear 322 is installed on the journal of the second planetary carrier housing 213 and is connected to the external spline of the fourth half shaft 23 through the internal spline of the fourth fixed plate, and the rotation axis of the second same-direction transmission gear 322 coincides with the rotation axis of the fourth half shaft 23; the third fixed plate is fixedly connected to the first same-direction transmission gear 321 by bolts, the fourth fixed plate is fixedly connected to the second same-direction transmission gear 322 by bolts, and the fourth The spline hole in the fixed plate is provided with a retaining ring groove, in which a retaining ring is installed to limit the axial movement of the fourth semi-axle 23; the intermediate shaft 323 is rotatably installed on the automobile body through the two bearing seats, and the intermediate shaft 323 is located between the second semi-axle 13 and the fourth semi-axle 23, and the intermediate shaft 323, the second semi-axle 13 and the fourth semi-axle 23 are parallel and arranged in a triangle; the intermediate gear 324 is installed on the intermediate shaft 323; the first co-directional transmission gear 321 and the second co-directional transmission gear 322 have the same outer diameter and number of teeth and are respectively meshed with the intermediate gear 324 for transmission, so that the second semi-axle 13 and the fourth semi-axle 23 rotate at the same speed and in the same direction. The mechanism containing the intermediate shaft 323 is beneficial to the two-stage reduction arrangement of power transmission, avoiding the design of a large transmission gear for single-stage reduction, reducing the weight of the active split differential, and is beneficial to the lightweight design of the automobile. The above is only one form of co-directional transmission, and other co-directional transmission forms are also included in the principle scope of the utility model.

[0039] Specifically, the first fixing plate and the first semi-shaft 12 , the second fixing plate and the third semi-shaft 22 , the third fixing plate and the second semi-shaft 13 , and the fourth fixing plate and the fourth semi-shaft 23 are all spline connected.

[0040] Specifically, the journal of the intermediate shaft 323, the right journal of the first planetary carrier housing 113 and the right journal of the second planetary carrier housing 213 are connected together through a first bearing seat 4 with two mounting semicircular holes and one axial hole, and the journal of the intermediate shaft 323, the left journal of the first planetary carrier housing 113 and the left journal of the second planetary carrier housing 213 are connected together through a second bearing seat 5 with two mounting semicircular holes and one axial hole. The first bearing seat 4 and the second bearing seat 5 are both fixedly connected to the vehicle body by bolts, which simplifies the installation and improves the quietness of the vehicle; the first input driven gear 118 and the first driving gear 111, which are connected as one, and the second input driven gear 218 and the second driving gear 211, which are connected as one, are installed on the intermediate shaft 232 and have the same rotation axis and are arranged between the two bearing seats.

[0041] Specifically, the length of the right journal of the first planetary carrier housing 113 is greater than the sum of the width of the mounting hole of the first bearing seat 4 and the width of the first co-directional transmission gear 321; the length of the right journal of the second planetary carrier housing 213 is greater than the sum of the width of the mounting hole of the first bearing seat 4 and the width of the second co-directional transmission gear 322; the length of the left journal of the first planetary carrier housing 113 is greater than the sum of the width of the mounting hole of the second bearing seat 5 and the width of the first reverse transmission gear 311; the length of the left journal of the second planetary carrier housing 213 is greater than the sum of the width of the mounting hole of the second bearing seat 5 and the width of the second reverse transmission gear 312.

[0042] Specifically, retaining spring grooves are provided between the two sides of the first reverse transmission gear 311 and the shaft journal of the first planet carrier housing 113, between the second reverse transmission gear 312 and the shaft journal of the second planet carrier housing 213, between the two sides of the first unidirectional transmission gear 321 and the shaft journal of the first planet carrier housing 113, and between the two sides of the second unidirectional transmission gear 322 and the shaft journal of the second planet carrier housing 213, and retaining spring grooves are installed in the retaining spring grooves; the first input driven gear 118 and the first driving gear 111 connected as one, and the second input driven gear 218 and the second driving gear 211 connected as one, have retaining spring grooves on both sides of the intermediate shaft 323 on which they are installed, and retaining spring grooves are installed in the retaining spring grooves.

[0043] The utility model also discloses a car, including the above active split differential. The utility model can realize the function of active differential while realizing the normal differential driving function of the car, thereby improving the car's escape, body motion trajectory adjustment, steering and passing ability and fuel economy.

[0044] The specific working status of the utility model is as follows:

[0045] When receiving the normal differential speed command, the external driving force drives the first planetary carrier housing 113 and the first planetary gear 114 thereon to revolve through the first driven gear 112, and the first planetary gear 114 rotates under the action of the first output gear 115 and the second output gear 116, thereby driving the first half shaft 12 and the second half shaft 13 of the vehicle to realize the normal differential speed driving function of the vehicle. It can be understood that the differential speed command can be a command automatically triggered according to the vehicle driving information (including the vehicle's speed and direction, acceleration and other information) to confirm that the vehicle is in a normal driving state.

[0046] When the active shunt component 2 is in a non-working state, the first planetary gear 114 is driven to rotate through the differential component 1 under the action of an external driving force, thereby realizing the normal differential driving function of the vehicle. At this time, the active shunt component 2 is in a zero-motion or follow-up state driven by the reverse transmission device 3, achieving the purpose of shunt and differential being associated and independent, extending the service life of the active shunt transmission, and utilizing the existing differential structure and manufacturing advantages, with mature accessories and low production and manufacturing costs.

[0047] The first half shaft 12 connected to the differential assembly 1 drives the third half shaft 22 connected to the active flow splitter assembly 2 to rotate in the opposite direction via the reverse transmission assembly 31; the second half shaft 13 connected to the differential assembly 1 drives the fourth half shaft 23 connected to the active flow splitter assembly 2 to rotate in the same direction via the same direction transmission assembly 32; thus, when the vehicle is traveling in a straight line, the third output gear 215 and the fourth output gear 216 of the active flow splitter assembly 2 rotate in the opposite direction at the same speed, and at this time, the second planetary gear 214 of the active flow splitter assembly 2 only rotates on its own axis but does not revolve around the sun. It can be understood that the second planetary gear shaft 217 in the center hole of the second planetary gear 214 of the active splitter assembly 2 has a zero speed due to no revolution, and the second planet carrier housing 213 connected to the second planetary gear shaft 217 has a zero speed and is in a zero-motion state; when the car turns or differentials, the third output gear 215 and the fourth output gear 216 rotate in the opposite direction at a differential speed. At this time, the second planetary gear 214 has both self-rotation and revolution, and the second planet carrier housing 213 is driven by the revolution of the second planetary gear shaft 217 to have a non-zero speed and is in a follow-up state. Therefore, the active splitter differential can reduce the resistance and drag torque of the car and improve the fuel economy of the car.

[0048] When the wheels of the vehicle are trapped, slipping or the vehicle body motion trajectory is adjusted, the active differential can be put into an active differential state. At this time, the active diverter component 2 makes the speed of the differential component 1 connecting the first half-shaft 12 and the second half-shaft 13 of the vehicle in an active differential state through the reverse transmission device 3. In this way, the vehicle's ability to escape from trouble and adjust the vehicle body motion trajectory is improved, the vehicle has better tracking performance on curves, and the vehicle's steering passing ability is improved. At the same time, active centralized differential control is more beneficial to the realization of the vehicle's precise controllable differential and automatic assisted driving technology.

[0049] When the active split differential is used for the front and rear drive of a car, when the differential assembly 1 is in an inoperative state or in an operative state, the first half-shaft 12 and the second half-shaft 13 are driven by the active split differential assembly 2 to be in a mutually reversed state, thereby realizing the function of turning the car on the spot, thereby improving the steering and passing capabilities of the car, and also laying a structural foundation for the intelligent differential and wire-controlled chassis.

[0050] The following example describes the relationship between the power transmission between the differential assembly 1 and the active flow splitting assembly 2:

[0051] Assume that N, T and P are the speed, torque and power of the differential assembly 1, NDIF, TDIF and PDIF are the speed, torque and power of the active split assembly 2; Assume that N1OUT, T1OUT and P1OUT are the speed, torque and power of the first half shaft 12, N2OUT, T2OUT and P2OUT are the speed, torque and power of the second half shaft 13; Assume that the torque directions of the differential assembly 1 and the active split assembly 2 are consistent;

[0052] When the active split differential is in normal differential mode: 2N = N1OUT + N2OUT; T = T1OUT + T2OUT; P = P1OUT + P2OUT;

[0053] When the active split differential is in the active split mode: 2N=N1OUT+N2OUT; T=T1OUT+T2OUT; P=P1OUT+P2OUT; 2NDIF=N2OUT-N1OUT; TDIF=T2OUT-T1OUT; PDI F=P2OUT-P1OUT.

[0054] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0055] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An active split differential, characterized in that: include: A differential assembly, the differential assembly comprising a first planetary gear assembly and a first half shaft and a second half shaft connected to two output ends of the first planetary gear assembly; An active flow splitter assembly, the active flow splitter assembly comprising a second planetary gear assembly and a third half shaft and a fourth half shaft connected to two output ends of the second planetary gear assembly; A reverse transmission device, the reverse transmission device comprising a reverse transmission assembly and a same-direction transmission assembly, the first half-shaft and the third half-shaft located on the same side are transmission-connected via the reverse transmission assembly, and the second half-shaft and the fourth half-shaft located on the same side are transmission-connected via the same-direction transmission assembly; A first power drive device and a second power drive device, wherein the first power drive device is drivingly connected to the first planetary gear assembly, and the second power drive device is drivingly connected to the second planetary gear assembly.

2. An active split differential according to claim 1, characterized in that: The first planetary gear assembly comprises a first driving gear, a first driven gear, a first planet carrier housing, a first planetary gear, a first output gear and a second output gear, the first driven gear is meshed and transmission-connected with the first driving gear, the driving driving gear on the output shaft of the first power drive device is meshed and transmission-connected with the first input driven gear, the first input driven gear and the first driving gear share the same rotation axis and are connected as a whole; the first driven gear is fixed to the first planet carrier housing by bolts; a plurality of the first planetary gears are mounted on the first planet carrier housing through the first planetary gear shaft and rotate around the first planetary gear shaft to which they belong; the first output gear is mounted on the first half shaft with the same rotation axis and connected through a spline, the second output gear is mounted on the second half shaft with the same rotation axis and connected through a spline; the first output gear and the second output gear are respectively meshed and transmission-connected with the first planetary gears.

3. The active split differential according to claim 1, characterized in that: The second planetary gear assembly includes a second driving gear, a second driven gear, a second planet carrier housing, a second planetary gear, a third output gear and a fourth output gear, the second driven gear is meshed and transmission-connected with the second driving gear, the driving driving gear on the output shaft of the second power drive device is meshed and transmission-connected with the second input driven gear, the second input driven gear and the second driving gear share the same rotation axis and are connected as a whole; the second driven gear is fixed to the second planet carrier housing by bolts; a plurality of second planetary gears are mounted on the second planet carrier housing through a second planetary gear shaft and rotate around the second planetary gear shaft; the third output gear is mounted on the third half shaft on the same rotation axis and is connected through a spline, the fourth output gear is mounted on the fourth half shaft on the same rotation axis and is connected through a spline; the third output gear and the fourth output gear are respectively meshed and transmission-connected with the second planetary gears.

4. The active split differential according to claim 3, characterized in that: The reverse transmission assembly includes a first reverse transmission gear and a second reverse transmission gear, the first reverse transmission gear is installed on the shaft journal of the first planetary carrier housing and is connected to the external spline on the first half-shaft through the internal spline of the first fixed plate, and the rotation axis of the first reverse transmission gear coincides with the rotation axis of the first half-shaft, the second reverse transmission gear is installed on the shaft journal of the second planetary carrier housing and is connected to the external spline of the third half-shaft through the internal spline of the second fixed plate, and the rotation axis of the second reverse transmission gear coincides with the rotation axis of the third half-shaft, the first reverse transmission gear and the second reverse transmission gear are meshed for transmission and have the same outer diameter and number of teeth; the first fixed plate and the first reverse transmission gear are fixedly connected by bolts, the second fixed plate and the second reverse transmission gear are fixedly connected by bolts, a retaining spring groove is provided in the spline hole in the second fixed plate, a retaining spring is installed in the retaining spring groove to limit the axial movement of the third half-shaft.

5. The active split differential according to claim 4, characterized in that: The same-direction transmission assembly comprises a first same-direction transmission gear, a second same-direction transmission gear, an intermediate shaft and an intermediate gear, wherein the first same-direction transmission gear is mounted on the journal of the first planet carrier housing and connected to the second half-shaft external spline through the third fixed plate internal spline, and the rotation axis of the first same-direction transmission gear coincides with the rotation axis of the second half-shaft; The second co-directional transmission gear is mounted on the journal of the second planetary carrier housing and is connected to the fourth half-shaft external spline through the fourth fixed plate internal spline, and the rotation axis of the second co-directional transmission gear coincides with the rotation axis of the fourth half-shaft; the third fixed plate is fixedly connected to the first co-directional transmission gear by bolts, and the fourth fixed plate is fixedly connected to the second co-directional transmission gear by bolts, and the spline hole in the fourth fixed plate is provided with a retaining ring groove, and a retaining ring is installed in the retaining ring groove to limit the axial movement of the fourth half-shaft; the intermediate shaft is rotatably mounted on the automobile body through a bearing seat, the intermediate shaft is located between the second half-shaft and the fourth half-shaft, and the intermediate shaft, the second half-shaft and the fourth half-shaft are parallel and arranged in a triangle; the intermediate gear is rotatably mounted on the intermediate shaft and positioned by the retaining ring; the first co-directional transmission gear and the second co-directional transmission gear have the same outer diameter and number of teeth and are respectively meshed with the intermediate gear for transmission.

6. The active split differential according to claim 5, characterized in that: The first fixing plate and the first half-shaft, the second fixing plate and the third half-shaft, the third fixing plate and the second half-shaft, and the fourth fixing plate and the fourth half-shaft are all spline connected.

7. The active split differential according to claim 6, characterized in that: The journal of the intermediate shaft, the right journal of the first planet carrier housing and the right journal of the second planet carrier housing are installed and connected together through a first bearing seat with two mounting semicircular holes and one shaft hole; the journal of the intermediate shaft, the left journal of the first planet carrier housing and the left journal of the second planet carrier housing are installed and connected together through a second bearing seat with two mounting semicircular holes and one shaft hole; the first input driven gear and the first driving gear connected as one body, and the second input driven gear and the second driving gear connected as one body are installed on the intermediate shaft and have the same rotation axis and are arranged between the two bearing seats.

8. The active split differential according to claim 7, characterized in that: The length of the right journal of the first planetary carrier housing is greater than the sum of the width of the mounting hole of the first bearing seat and the width of the first co-directional transmission gear; the length of the right journal of the second planetary carrier housing is greater than the sum of the width of the mounting hole of the first bearing seat and the width of the second co-directional transmission gear; the length of the left journal of the first planetary carrier housing is greater than the sum of the width of the mounting hole of the second bearing seat and the width of the first reverse transmission gear; the length of the left journal of the second planetary carrier housing is greater than the sum of the width of the mounting hole of the second bearing seat and the width of the second reverse transmission gear.

9. The active split differential according to claim 8, characterized in that: Circlip grooves are provided between the two sides of the first reverse transmission gear and the journal of the first planet carrier housing, between the second reverse transmission gear and the journal of the second planet carrier housing, between the two sides of the first unidirectional transmission gear and the journal of the first planet carrier housing, and between the two sides of the second unidirectional transmission gear and the journal of the second planet carrier housing, and circlip grooves are installed in the circlip grooves; the first input driven gear and the first driving gear connected as one, and the second input driven gear and the second driving gear connected as one, are provided with circlip grooves on both sides of the intermediate shaft on which they are installed, and circlip grooves are installed in the circlip grooves.

10. An automobile, characterized in that: An active split differential comprising any one of claims 1-9.

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