Electric drive balance box based on self-circulation lubrication and split type composite transmission

Abstract

The invention discloses an electric drive balance box based on self-circulation lubrication and split type composite transmission, which comprises a balance box body and a wheel side speed reduction component, a motor input assembly is arranged on the balance box body, and the two sides of a gear of the motor input assembly are respectively meshed with a multi-stage intermediate gear assembly. And the last stage of intermediate gear assembly is meshed with the gear of the output shaft assembly. The output shaft assembly is connected with the wheel-side speed reduction component, and the wheel-side speed reduction component is used for reducing the speed and increasing the torque of the power of the output shaft assembly, so that the functions of driving and parking are realized. The transmission scheme of coupling of the motor, the parallel shaft system gear and the planet row is innovatively adopted, a plurality of fixed shaft gear sets are adopted to form a parallel shaft system, larger loads can be borne, meanwhile, high rotating speed, high frequency and high torque from electric driving force can be borne, and the applicable energy and power types are wider.

Description

Technical Field

[0001] The invention relates to an electric drive balance box based on self-circulating lubrication and split-type composite transmission, belonging to the technical field of engineering machinery. Background Art

[0002] At present, high-horsepower grader engineering machinery products used for ground leveling, finishing, trenching, slope shaping and other operations have harsh operating conditions, heavy loads, and long working hours. It is difficult to meet the development needs of grader products towards high reliability, low temperature rise, low cost, and high load.

[0003] The continuous operation conditions of existing motor graders place high demands on the lubrication of gears and bearings. Prolonged gear meshing and bearing rotation will generate a large amount of heat due to friction. Failure to ensure gear heat dissipation and bearing lubrication will lead to gear wear and bearing damage. Splash lubrication is often used in the balance box of motor graders. When running continuously for a long time at a certain slope, some gears will engage without heat dissipation and bearings will not be lubricated, thereby reducing the reliability of the motor grader. In addition, the rear axle balance box of the transmission cannot bear high loads. With the rapid development of new energy, electric drive of motor graders has become a trend. Existing high-horsepower motor graders pose higher challenges to the temperature rise, lubrication, reliability and transmission structure of the balance box.

[0004] Therefore, it is of great practical significance to develop a new balancing box for electric-driven graders with high reliability and lubricity to meet the high-load and continuous operation conditions of graders. Summary of the Invention

[0005] Purpose: In order to overcome the deficiencies in the prior art, the present invention provides an electric drive balance box based on self-circulating lubrication and split-type composite transmission.

[0006] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:

[0007] The invention relates to an electric drive balance box based on self-circulating lubrication and split-type compound transmission, comprising: a balance box body, a wheel-side reduction component, a motor input assembly being provided on the balance box body, a first intermediate gear assembly and a second intermediate gear assembly being respectively engaged on both sides of the gear of the motor input assembly, the other side of the first intermediate gear assembly being engaged with a third intermediate gear assembly, the other side of the second intermediate gear assembly being engaged with a fourth intermediate gear assembly, the other side of the third intermediate gear assembly being engaged with a gear of a first output shaft assembly, the other side of the fourth intermediate gear assembly being engaged with a gear of a second output shaft assembly, the first output shaft assembly and the second output shaft assembly being respectively connected to the wheel-side reduction component, the wheel-side reduction component being used to decelerate and increase torque of the power of the output shaft assembly to realize driving and parking functions.

[0008] Optionally, the wheel-side deceleration component includes: a support shaft assembly, an inner ring gear assembly is provided in the support shaft assembly, a first-stage planetary transmission mechanism and a second-stage planetary transmission mechanism of meshing transmission are provided in the inner ring gear assembly, a parking brake assembly is provided at the input end of the first-stage planetary transmission mechanism, and a service brake assembly is provided at the output end of the first-stage planetary transmission mechanism.

[0009] Optionally, it also includes an oil collecting tank and a lubrication assembly. The balance box body is provided with an oil collecting tank, and the lubrication assembly is used to provide the lubricating oil in the oil collecting tank to the motor input assembly, the intermediate gear assembly, and the output shaft assembly for heat dissipation and lubrication.

[0010] Optionally, the lubrication assembly includes a lubrication pipeline assembly, and the ends of each branch of the lubrication pipeline assembly are respectively arranged at corresponding positions of the meshing gears and bearings, for dissipating heat and lubricating the meshing gears and bearings.

[0011] Optionally, the lubrication assembly also includes an external circulation power system, which includes a pump, an oil filtration system, and a heat dissipation system. The pump, oil filtration system, and heat dissipation system are connected in sequence through pipelines, the inlet of the pump is connected to the outlet pipeline of the lubrication pipeline assembly, and the outlet of the heat dissipation system is connected to the inlet pipeline of the lubrication pipeline assembly.

[0012] Optionally, the lubrication pipeline assembly includes: a first output connector, a second output connector, one end of the first output connector is connected to the first end of the first three-way connector, the second end of the first three-way connector is connected to the first end of the second three-way connector, the second end of the second three-way connector is connected to the first end of the third three-way connector, and the second end of the third three-way connector is connected to the first end of the fourth three-way connector; one end of the second output connector is connected to the first end of the fifth three-way connector, the second end of the fifth three-way connector is connected to the first end of the sixth three-way connector, the second end of the sixth three-way connector is connected to the first end of the seventh three-way connector, and the second end of the seventh three-way connector is connected to the first end of the eighth three-way connector.

[0013] The other end of the first output joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the output end cover of the first output shaft assembly. The third end of the first three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the third intermediate gear assembly and the gear of the first output shaft assembly. The third end of the third three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the third intermediate gear assembly and the gear of the first intermediate gear assembly. The second end of the fourth three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the first intermediate gear assembly and the gear of the motor input assembly.

[0014] The other end of the second output joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the output end cover of the second output shaft assembly. The third end of the fifth three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the fourth intermediate gear assembly and the gear of the second output shaft assembly. The third end of the seventh three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the fourth intermediate gear assembly and the gear of the second intermediate gear assembly. The second end of the eighth three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the second intermediate gear assembly and the gear of the motor input assembly.

[0015] The third end of the second tee is connected to the first end of the ninth tee, the second end of the ninth tee is connected to the first end of the thirteenth tee, the second end of the thirteenth tee is connected to the first end of the eleventh tee, the second end of the eleventh tee is connected to the first end of the twelfth tee, the second end of the twelfth tee is connected to the first end of the thirteenth tee, and the second end of the thirteenth tee is connected to the third end of the sixth tee.

[0016] The third end of the ninth three-way joint is communicated with the cavity in the bearing fixing plate of the third intermediate gear assembly through the throttle hole in the balancing box case, the third end of the thirteenth three-way joint is communicated with the gear lubrication main channel of the first gear shaft of the first intermediate gear assembly through the throttle hole in the balancing box case, the third end of the eleventh three-way joint is communicated with the input lubrication main channel of the input shaft of the motor input assembly through the throttle hole in the balancing box case, the third end of the twelfth three-way joint is communicated with the gear lubrication main channel of the first gear shaft of the second intermediate gear assembly through the throttle hole in the balancing box case, and the third end of the thirteenth three-way joint is communicated with the cavity in the bearing fixing plate of the fourth intermediate gear assembly through the throttle hole in the balancing box case.

[0017] One end of the oil tank output pipe is communicated with the oil collecting tank.

[0018] Optionally, the other end of the oil tank output pipe is connected to the input end of the pump, and the third end of the fourth three-way joint and the third end of the eighth three-way joint are respectively connected to the output end of the cooling system.

[0019] Optionally, the motor input assembly includes: an input shaft, on which an input lubrication main channel is provided, the input lubrication main channel is connected to the lubrication sub-channels respectively, and the ports of the lubrication sub-channels are provided between the first input bearing and the second input bearing.

[0020] Optionally, the first intermediate gear assembly and the second intermediate gear assembly both include: a first gear shaft, a first gear bearing is sleeved on the first gear shaft, a lubrication fixing plate is also sleeved on the first gear shaft and covers the end face of the first gear bearing, a gear lubrication main channel is provided on the first gear shaft, a gear lubrication sub-channel is provided on the gear lubrication main channel, and a port of the gear lubrication sub-channel is communicated with a cavity in the lubrication fixing plate.

[0021] Optionally, the third intermediate gear assembly and the fourth intermediate gear assembly both include: a second gear shaft, on which a second gear bearing, a bearing fixing plate and an annular plate are sequentially sleeved, a cavity being provided in the bearing fixing plate, and the cavity being connected to the second gear bearing through a through hole in the bearing fixing plate.

[0022] Optionally, the first output shaft assembly and the second output shaft assembly both include: an output shaft, an output bearing sleeved on the output shaft, an output end cover fixed on the output bearing, an oil collecting groove provided on the output end cover, and the oil collecting groove is connected to the output bearing through a through hole.

[0023] Optionally, a protective column is provided at the bottom of the balance box body.

[0024] Beneficial effects: The present invention provides an electric-driven balance box based on self-circulating lubrication and split-type composite transmission. Aiming at the driving route of high-horsepower electric-driven graders, it innovatively adopts the "motor + parallel shaft gear + planetary gear coupling" transmission scheme. The new balance box is divided into two parts: the box body and the wheel-side reduction assembly. In order to solve the problem of small load-bearing capacity of the traditional chain transmission structure of the box body, the present invention adopts multiple fixed-axis gear sets to form a parallel shaft system, which can not only withstand greater loads, but also withstand high speed, high frequency and high torque from the electric drive force, and is applicable to a wider range of energy and power types.

[0025] In order to further improve the high reliability and versatility of the balance box, the wheel-side reduction part of the balance box of the present invention and the box body adopt a split-cavity combination form. The power of the box body is transmitted to the wheel-side reduction through the spline shaft, and splash lubrication is adopted to meet the lubrication needs of the wheel-side reduction assembly itself, further enhancing the high reliability and maintainability of the whole machine; in terms of functionality, it is no longer limited to the current basic functions of deceleration and torque increase, and has a built-in "disc spring-friction plate / steel plate" combination, adding service brake and parking brake functions, which effectively improves the safety and reliability of vehicle braking.

[0026] To address the technical challenges of simultaneously meeting the requirements of gear meshing heat dissipation, bearing lubrication, oil churning losses, and slope operation in the balance box of high-horsepower graders, the present invention provides a multi-point distributed circulating lubrication structure. While the wheel reduction assembly of the balance box still utilizes oil immersion lubrication, the box assembly utilizes a multi-point distributed lubrication structure, with the two lubrication chambers being independent of each other. This multi-point structure utilizes circulating lubrication to address the fundamental issue of oil churning losses, retaining only a minimum level of lubricating oil within the chamber. Spray lubrication addresses the issues of gear and bearing lubrication and heat dissipation during slope operation. Stepped holes and an oil shield address new challenges such as connector dropout and insufficient lubrication flow brought on by the new solution. An oil sump is provided at the bottom to prevent interruptions in the circulating lubrication process.

[0027] Compared with the prior art, the advantages of the present invention are as follows:

[0028] 1) The high-horsepower motor grader involved in this invention abandons the traditional rear-axle drive route and innovatively adopts a motor + parallel shaft gear + planetary gear coupling transmission route. The structural design is simpler and more reasonable, improving transmission efficiency and power density. The new balance box is divided into two parts: the box body and the wheel-side reduction assembly. The wheel-side reduction assembly adopts a built-in wet driving and parking brake mechanism, with a compact structure, effectively improving the safety and reliability of the vehicle's braking.

[0029] 2) Structural design of a balance box for high-horsepower motor graders. This invention proposes an electrically driven balance box based on self-circulating lubrication and a split-type composite transmission. The box adopts a "one-way, multiple-path" circulation lubrication scheme. Through an external pipeline + internal oil channel structure, appropriate throttle holes and oil collection tanks are set according to the lubrication requirements of components such as gears and bearings. This effectively improves lubrication and reduces oil churn losses. It also overcomes the problem of insufficient lubrication of some gears and bearings under the balance box's oil churn lubrication method when the motor grader is operating horizontally or on slopes.

[0030] 3) The multi-point distributed circulating lubrication structure of the present invention adopts a stepped hole structure to effectively prevent the risk of joints falling off due to box vibration, thereby improving the reliability of the reducer; an oil collecting tank is set at the bottom to effectively prevent circuit breakage during the circulating lubrication operation; protective columns are provided in front and behind the oil storage tank to protect the oil collecting tank from damage, greatly improving the reliability of the balance box and meeting the requirements of the grader operating in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the electric drive balance box of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the balance box body of the present invention.

[0033] Figure 3 It is a front schematic diagram of the balance box body of the present invention.

[0034] Figure 4 It is a schematic diagram of the reverse side of the balance box body of the present invention.

[0035] Figure 5 It is a structural schematic diagram of the lubrication pipeline assembly of the present invention.

[0036] Figure 6 It is a structural schematic diagram of the lubrication assembly of the present invention.

[0037] Figure 7 It is a schematic cross-sectional view of the present invention in the directions of AA, BB, CC, and DD.

[0038] Figure 8 It is a schematic cross-sectional view of the motor input assembly along the AA direction of the present invention.

[0039] Figure 9 This is a cross-sectional schematic diagram of the first intermediate gear assembly and the second intermediate gear assembly in the BB direction of the present invention.

[0040] Figure 10 This is a schematic cross-sectional view of the third and fourth intermediate gear assemblies in the CC direction of the present invention.

[0041] Figure 11It is a cross-sectional schematic diagram of the first output shaft assembly and the second output shaft assembly in the DD direction of the present invention. DETAILED DESCRIPTION

[0042] The following is a clear and complete description of the technical solutions in the examples of the present invention, in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0043] The present invention will be further described below with reference to specific embodiments.

[0044] Example 1:

[0045] This embodiment introduces an electric drive balance box based on self-circulating lubrication and split-type composite transmission. Figure 1 、 2 As shown, it includes: a balance box body 1, a wheel-side deceleration component 12, the balance box body 1 is provided with a motor input assembly 2, and the first intermediate gear assembly 3 and the second intermediate gear assembly 4 are respectively engaged on both sides of the gear of the motor input assembly 2, the other side of the first intermediate gear assembly 3 is engaged with the third intermediate gear assembly 5, and the other side of the second intermediate gear assembly 4 is engaged with the fourth intermediate gear assembly 6, the other side of the third intermediate gear assembly 5 is engaged with the gear of the first output shaft assembly 7, and the other side of the fourth intermediate gear assembly 6 is engaged with the gear of the second output shaft assembly 8, the first output shaft assembly 7 and the second output shaft assembly 8 are respectively connected to the wheel-side deceleration component 12, and the wheel-side deceleration component 12 is used to decelerate and increase the torque of the output shaft assembly to realize driving and parking functions.

[0046] Furthermore, the wheel-side reduction component 12 includes: a support shaft assembly 1201, an inner ring gear assembly 1202 is provided in the support shaft assembly 1201, a first-stage planetary transmission mechanism 1203 and a second-stage planetary transmission mechanism 1204 of meshing transmission are provided in the inner ring gear assembly 1202, a parking brake assembly 1205 is provided at the input end of the first-stage planetary transmission mechanism 1203, and a service brake assembly 1206 is provided at the output end of the first-stage planetary transmission mechanism 1205.

[0047] Further, such as Figure 3 , Figure 4 As shown, it also includes an oil collecting tank 9 and a lubrication assembly. The balance box body 1 is provided with an oil collecting tank 9, and the lubrication assembly is used to provide the lubricating oil in the oil collecting tank 9 to the motor input assembly, the intermediate gear assembly, and the output shaft assembly for heat dissipation and lubrication.

[0048] Further, such as Figure 5 , Figure 6 As shown, the lubrication assembly includes a lubrication pipeline assembly 10. The ends of each branch of the lubrication pipeline assembly 10 are respectively arranged at corresponding positions of the meshing gears and bearings, for dissipating heat and lubricating the meshing gears and bearings.

[0049] Furthermore, the lubrication assembly also includes an external circulation power system, which includes a pump, an oil filtration system, and a heat dissipation system. The pump, oil filtration system, and heat dissipation system are connected in sequence through pipelines. The inlet of the pump is connected to the outlet pipeline of the lubrication pipeline assembly 10, and the outlet of the heat dissipation system is connected to the inlet pipeline of the lubrication pipeline assembly 10.

[0050] Furthermore, the lubrication pipeline assembly 10 includes: a first output connector 1001 and a second output connector 1002, wherein one end of the first output connector 1001 is connected to the first end of the first three-way connector 1003, the second end of the first three-way connector 1003 is connected to the first end of the second three-way connector 1004, the second end of the second three-way connector 1004 is connected to the first end of the third three-way connector 1005, and the second end of the third three-way connector 1005 is connected to the first end of the fourth three-way connector 1006; one end of the second output connector 1002 is connected to the first end of the fifth three-way connector 1007, the second end of the fifth three-way connector 1007 is connected to the first end of the sixth three-way connector 1008, the second end of the sixth three-way connector 1008 is connected to the first end of the seventh three-way connector 1009, and the second end of the seventh three-way connector 1009 is connected to the first end of the eighth three-way connector 1010.

[0051] The other end of the first output joint 1001 is connected to the throttle hole in the balance box body 1, and the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the output end cover 703 of the first output shaft assembly 7. The third end of the first three-way joint 1003 is connected to the throttle hole in the balance box body 1, and the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the third intermediate gear assembly 5 and the gear of the first output shaft assembly 7. The third end of the third three-way joint 1005 is connected to the throttle hole in the balance box body 1, and the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the third intermediate gear assembly 5 and the gear of the first intermediate gear assembly 3. The second end of the fourth three-way joint 1006 is connected to the throttle hole in the balance box body 1, and the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the first intermediate gear assembly 3 and the gear of the motor input assembly 2.

[0052] The other end of the second output joint 1002 is connected to the throttle hole in the balance box body 1, and the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the output end cover 703 of the second output shaft assembly 8. The third end of the fifth three-way joint 1007 is connected to the throttle hole in the balance box body 1, and the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the fourth intermediate gear assembly 6 and the gear of the second output shaft assembly 8. The third end of the seventh three-way joint 1009 is connected to the throttle hole in the balance box body 1, and the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the fourth intermediate gear assembly 6 and the gear of the second intermediate gear assembly 4. The second end of the eighth three-way joint 1010 is connected to the throttle hole in the balance box body 1, and the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing between the gear of the second intermediate gear assembly 4 and the gear of the motor input assembly 2.

[0053] The third end of the second three-way joint 1004 is connected to the first end of the ninth three-way joint 1011, the second end of the ninth three-way joint 1011 is connected to the first end of the thirteenth three-way joint 1012, the second end of the thirteenth three-way joint 1012 is connected to the first end of the eleventh three-way joint 1013, the second end of the eleventh three-way joint 1013 is connected to the first end of the twelfth three-way joint 1014, the second end of the twelfth three-way joint 1014 is connected to the first end of the thirteenth three-way joint 1015, and the second end of the thirteenth three-way joint 1015 is connected to the third end of the sixth three-way joint 1008.

[0054] The third end of the ninth three-way joint 1011 is communicated with the cavity 5031 in the bearing fixing plate 503 of the third intermediate gear assembly 5 through the throttle hole in the balancing box housing 1. The third end of the thirteenth three-way joint 1012 is communicated with the gear lubrication main channel 304 of the first gear shaft 301 of the first intermediate gear assembly 3 through the throttle hole in the balancing box housing 1. The third end of the eleventh three-way joint 1013 is communicated with the input lubrication main channel of the input shaft 201 of the motor input assembly 2 through the throttle hole in the balancing box housing 1. The third end of the twelfth three-way joint 1014 is communicated with the gear lubrication main channel 304 of the first gear shaft 301 of the second intermediate gear assembly 4 through the throttle hole in the balancing box housing 1. The third end of the thirteenth three-way joint 1015 is communicated with the cavity 5031 in the bearing fixing plate 503 of the fourth intermediate gear assembly 6 through the throttle hole in the balancing box housing 1.

[0055] One end of the oil tank output pipe 1016 is connected to the oil collecting tank 9.

[0056] Furthermore, the other end of the oil tank output pipe 1016 is connected to the input end of the pump, and the third end of the fourth three-way joint 1006 and the third end of the eighth three-way joint 1010 are respectively connected to the output end of the cooling system.

[0057] Further, such as Figure 7 , Figure 8 As shown, the motor input assembly 2 includes: an input shaft 201, and an input lubrication main channel 202 is provided on the input shaft 201. The input lubrication main channel 202 is connected to the lubrication sub-channel 203 respectively, and the port of the lubrication sub-channel 203 is set between the first input bearing 204 and the second input bearing 205.

[0058] Further, such as Figure 9 As shown, the first intermediate gear assembly 3 and the second intermediate gear assembly 4 both include: a first gear shaft 301, a first gear bearing 302 is sleeved on the first gear shaft 301, a lubrication fixing plate 303 covering the end face of the first gear bearing 302 is also sleeved on the first gear shaft 301, a gear lubrication main channel 304 is provided on the first gear shaft 301, a gear lubrication sub-channel 305 is provided on the gear lubrication main channel 304, and a port of the gear lubrication sub-channel 305 is communicated with a cavity 306 in the lubrication fixing plate 303.

[0059] Further, such as Figure 10 As shown, the third intermediate gear assembly 5 and the fourth intermediate gear assembly 6 both include: a second gear shaft 501, on which a second gear bearing 502, a bearing fixing plate 503 and an annular plate 504 are sequentially sleeved, and a cavity 5031 is provided in the bearing fixing plate 503, and the cavity 5031 is communicated with the second gear bearing 502 via a through hole 5032 on the bearing fixing plate 503.

[0060] Further, such as Figure 11 As shown, the first output shaft assembly 7 and the second output shaft assembly 8 both include: an output shaft 701, an output bearing 702 is sleeved on the output shaft 701, an output end cover 703 is fixed on the output bearing 702, an oil collecting groove 7031 is provided on the output end cover 703, and the oil collecting groove 7031 is connected to the output bearing 702 through a through hole 7032.

[0061] Furthermore, a protective column 11 is provided at the bottom of the balance box body 1.

[0062] Example 2:

[0063] This embodiment introduces the use process of an electric-driven balance box based on self-circulating lubrication and split-type composite transmission. The first intermediate gear assembly and the second intermediate gear assembly both use Z95 gears, and the third intermediate gear assembly and the fourth intermediate gear assembly both use Z71 gears. The motor input assembly works under the drive of the motor output shaft. The motor input assembly simultaneously drives the Z95 gear to rotate, the Z95 gear drives the Z71 gear to rotate, and the Z71 gear drives the output shaft assembly to rotate to output power outward.

[0064] The wheel-side reduction component is connected to the balance box body via a support shaft assembly. The output shaft in the output shaft assembly transmits power to the primary sun gear via a splined sleeve. Since the primary and secondary planetary transmission mechanisms share a common inner ring gear assembly, which is splined and bound to the support shaft, the secondary planetary carrier is bolted to the end cover, and the end cover is bolted to the housing, power is ultimately output to the housing through a path such as "primary sun gear → primary planetary gear → primary planetary carrier → secondary sun gear → secondary planetary gear → secondary planetary carrier → end cover → housing." In addition, the primary planetary carrier adopts a combination of disc spring parking and friction plate service brake structures, utilizing the contact movement of the service brake piston and the parking brake piston to achieve driving and parking functions.

[0065] The external circulation power system of the lubrication assembly extracts the lubricating oil from the oil collection tank, passes through the oil filtration system and the heat dissipation system, and then inputs it from the inlet of the lubrication pipeline assembly to dissipate heat and lubricate the meshing gears and bearings. Then, under the action of gravity, it gathers in the bottom oil collection tank. Under the action of external pumping, the lubricating oil is pumped from the pipeline through the radiator, oil filtration system and other links into the box lubrication system again, thereby realizing the circulation lubrication of the balanced box.

[0066] The lubrication pipeline assembly adopts a multi-level stepped hole structure to place the throttle hole and pipeline to prevent the internal pipeline or built-in throttle hole from falling off due to the vibration of the whole machine; an arched oil collecting tank is set at the bottom of the balance box, with protective columns welded at the front and rear, and reinforced ribs added to ensure the safety and reliability of the oil collecting tank in complex operating environments.

[0067] This invention abandons the traditional rear axle balancing box approach and innovatively adopts a motor + parallel shaft gear + planetary gear coupled transmission. The structural design is simpler and more rational, improving transmission efficiency and power density. The new balancing box is divided into two parts: the box body and the wheel reduction assembly. The box body and the wheel reduction assembly adopt separate chamber lubrication. The wheel reduction assembly has a reliable self-lubricating system. Based on the results of lubrication flow field analysis, the lubricating oil flow path in the planetary gear is designed to meet the lubrication flow requirements of the bearings and gears simply and reliably, without the need for an external oil pumping system.

[0068] The present invention adopts a multi-point distributed circulating lubrication structure. Through the structural form of external pipeline + internal oil channel, reasonable throttle holes and oil collecting tanks are set according to the lubrication requirements of gears, bearings and other components, which effectively improves the lubrication effect and reduces oil churning loss.

[0069] The multi-point distributed circulating lubrication structure of the present invention adopts a stepped hole structure at the interface, which effectively prevents the risk of the joint falling off due to the vibration of the box and improves the reliability of the reducer; an oil collecting tank and protective columns are set at the bottom to effectively prevent problems such as oil leakage and circulation interruption caused by the new design scheme.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electric drive balance box based on self-circulating lubrication and split-type composite transmission, characterized by: include: A balance box body, a wheel-side deceleration component, and a motor input assembly is provided on the balance box body. The first intermediate gear assembly and the second intermediate gear assembly are respectively engaged on both sides of the gear of the motor input assembly. The other side of the first intermediate gear assembly is engaged with the third intermediate gear assembly, and the other side of the second intermediate gear assembly is engaged with the fourth intermediate gear assembly. The other side of the third intermediate gear assembly is engaged with the gear of the first output shaft assembly, and the other side of the fourth intermediate gear assembly is engaged with the gear of the second output shaft assembly. The first output shaft assembly and the second output shaft assembly are respectively connected to the wheel-side deceleration component. The wheel-side deceleration component is used to decelerate and increase the torque of the output shaft assembly to realize driving and parking functions.

2. The electric drive balance box based on self-circulating lubrication and split-type composite transmission according to claim 1 is characterized by: It also includes an oil collecting tank and a lubrication assembly. The balance box body is provided with an oil collecting tank, and the lubrication assembly is used to provide the lubricating oil in the oil collecting tank to the motor input assembly, the intermediate gear assembly, and the output shaft assembly for heat dissipation and lubrication.

3. The electrically driven balance box based on self-circulating lubrication and split-type composite transmission according to claim 2, characterized in that: The lubrication assembly includes a lubrication pipeline assembly. The ends of each branch of the lubrication pipeline assembly are respectively arranged at corresponding positions of the meshing gears and the bearings, and are used for heat dissipation and lubrication of the meshing gears and the bearings.

4. The electrically driven balance box based on self-circulating lubrication and split-type composite transmission according to claim 2, characterized in that: The lubrication assembly also includes an external circulation power system, which includes a pump, an oil filtration system, and a heat dissipation system. The pump, oil filtration system, and heat dissipation system are connected in sequence through pipelines. The inlet of the pump is connected to the outlet pipeline of the lubrication pipeline assembly, and the outlet of the heat dissipation system is connected to the inlet pipeline of the lubrication pipeline assembly.

5. The electric drive balance box based on self-circulating lubrication and split-type composite transmission according to claim 2, characterized in that: The lubrication pipeline assembly includes: a first output connector and a second output connector, wherein one end of the first output connector is connected to the first end of the first three-way connector, the second end of the first three-way connector is connected to the first end of the second three-way connector, the second end of the second three-way connector is connected to the first end of the third three-way connector, and the second end of the third three-way connector is connected to the first end of the fourth three-way connector; one end of the second output connector is connected to the first end of the fifth three-way connector, the second end of the fifth three-way connector is connected to the first end of the sixth three-way connector, the second end of the sixth three-way connector is connected to the first end of the seventh three-way connector, and the second end of the seventh three-way connector is connected to the first end of the eighth three-way connector; The other end of the first output joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the output end cover of the first output shaft assembly, the third end of the first three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing position between the gear of the third intermediate gear assembly and the gear of the first output shaft assembly, the third end of the third three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing position between the gear of the third intermediate gear assembly and the gear of the first intermediate gear assembly, the second end of the fourth three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing position between the gear of the first intermediate gear assembly and the gear of the motor input assembly; The other end of the second output joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the output end cover of the second output shaft assembly. The third end of the fifth three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing position between the gear of the fourth intermediate gear assembly and the gear of the second output shaft assembly. The third end of the seventh three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing position between the gear of the fourth intermediate gear assembly and the gear of the second intermediate gear assembly. The second end of the eighth three-way joint is connected to the throttle hole in the balance box case, the other end of the throttle hole is connected to a pipeline, and the outlet of the other end of the pipeline is arranged above the meshing position between the gear of the second intermediate gear assembly and the gear of the motor input assembly; The third end of the second tee is connected to the first end of the ninth tee, the second end of the ninth tee is connected to the first end of the thirteenth tee, the second end of the thirteenth tee is connected to the first end of the eleventh tee, the second end of the eleventh tee is connected to the first end of the twelfth tee, the second end of the twelfth tee is connected to the first end of the thirteenth tee, and the second end of the thirteenth tee is connected to the third end of the sixth tee; The third end of the ninth three-way joint is communicated with the cavity in the bearing fixing plate of the third intermediate gear assembly through the throttle hole in the balancing box case. The third end of the thirteenth three-way joint is communicated with the gear lubrication main channel of the first gear rotating shaft of the first intermediate gear assembly through the throttle hole in the balancing box case. The third end of the eleventh three-way joint is communicated with the input lubrication main channel of the input shaft of the motor input assembly through the throttle hole in the balancing box case. The third end of the twelfth three-way joint is communicated with the gear lubrication main channel of the first gear rotating shaft of the second intermediate gear assembly through the throttle hole in the balancing box case. The third end of the thirteenth three-way joint is communicated with the cavity in the bearing fixing plate of the fourth intermediate gear assembly through the throttle hole in the balancing box case. One end of the oil tank output pipe is communicated with the oil collecting tank.

6. The electrically driven balance box based on self-circulating lubrication and split-type composite transmission according to claim 1, characterized in that: The wheel-side reduction component includes: a support shaft assembly, an inner ring gear assembly is arranged in the support shaft assembly, a first-stage planetary transmission mechanism and a second-stage planetary transmission mechanism of meshing transmission are arranged in the inner ring gear assembly, a parking brake assembly is arranged at the input end of the first-stage planetary transmission mechanism, and a service brake assembly is arranged at the output end of the first-stage planetary transmission mechanism.

7. The electrically driven balance box based on self-circulating lubrication and split-type composite transmission according to claim 1, characterized in that: The motor input assembly includes an input shaft, on which an input lubrication main channel is provided. The input lubrication main channel is communicated with lubrication sub-channels respectively, and ports of the lubrication sub-channels are provided between the first input bearing and the second input bearing.

8. The electrically driven balance box based on self-circulating lubrication and split-type composite transmission according to claim 1, characterized in that: The first intermediate gear assembly and the second intermediate gear assembly both include: a first gear shaft, a first gear bearing is sleeved on the first gear shaft, a lubrication fixing plate is also sleeved on the first gear shaft and covers the end surface of the first gear bearing, a gear lubrication main channel is provided on the first gear shaft, a gear lubrication sub-channel is provided on the gear lubrication main channel, and a port of the gear lubrication sub-channel is communicated with a cavity in the lubrication fixing plate.

9. The electrically driven balance box based on self-circulating lubrication and split-type composite transmission according to claim 1, characterized in that: The third intermediate gear assembly and the fourth intermediate gear assembly both include: a second gear shaft, on which a second gear bearing, a bearing fixing plate and an annular plate are sequentially sleeved, a cavity is provided in the bearing fixing plate, and the cavity is communicated with the second gear bearing through a through hole in the bearing fixing plate.

10. The electric drive balance box based on self-circulating lubrication and split-type composite transmission according to claim 1, characterized in that: The first output shaft assembly and the second output shaft assembly both include: an output shaft, an output bearing sleeved on the output shaft, an output end cover fixed on the output bearing, an oil collecting groove provided on the output end cover, and the oil collecting groove is connected to the output bearing through a through hole.

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