A wet drive axle integrated with an automatic lubrication and cooling system

Abstract

The present invention discloses a wet drive axle integrated with an automatic lubrication and cooling system, which includes a torque transmission unit and a drive shaft I. The drive shaft I is provided with a front bearing and a rear bearing, and a temperature sensor is arranged on the front bearing. The drive shaft I is sequentially linked with a differential assembly, a planetary transmission assembly, a hub assembly, and a multi-disc wet brake assembly, and a temperature sensor is provided on the multi-disc wet brake assembly. A pump speed increasing gear I is arranged in the middle of the drive shaft I, the pump speed increasing gear I is linked with a pump speed increasing gear II, the pump speed increasing gear II is provided with a drive shaft II, the drive shaft II includes a clutch, the other end of the drive shaft II is connected to an oil pump, the oil pump is provided with an oil sump, and the oil outlet of the oil pump is connected to an electromagnetic reversing valve. When the relevant parts of the drive axle brake are measured to be overheated by the temperature sensor, the controller assembly controls the clutch to close to drive the oil pump to work, and the electromagnetic reversing valve can be adjusted as required under the control of the controller assembly, so as to realize the automatic lubrication and cooling of the relevant parts.

Description

Technical Field

[0001] The present invention belongs to the technical field of braking systems for mobile machinery, and particularly relates to a wet drive axle integrated with an automatic lubrication and cooling system. Background Art

[0002] At present, with the increasingly strict national control over mining resources, the mining industry is gradually developing towards large-scale and integrated development, which promotes the corresponding mining engineering vehicles to change in the same direction. Due to the special working environment of mines, there are some unconventional terrains such as long slopes and steep slopes. When mining engineering vehicles work in such unconventional terrains, they need to brake frequently. Therefore, mining engineering vehicles are mostly equipped with wet brakes. The wet brakes adopt a multi-disc structure, which can obtain a large braking torque under a small lining pressure, while the pressure borne by the components is reduced and the specific pressure of the friction plate is small; the wet brakes adopt a single brake piston propulsion structure, and the friction components are uniformly stressed. The disc gap is calculated and set to allow slip and transmit torque, which is suitable for heavy-duty long-slope braking conditions. However, the inventor believes that the commonly installed wet brakes on a single axle, especially when applied to medium and large-tonnage mining engineering vehicles, are prone to problems such as overloading and overheating of the drive axle brakes, resulting in excessive wear, and even deformation and failure. When the friction plates in the drive axle brakes are excessively worn, it often causes the parking brake to fail, and then the mining engineering vehicle will slip when parked on a slope. Once the braking of the mining engineering vehicle underground fails, it will often cause serious casualties and property losses. Therefore, it is necessary to design a wet drive axle integrated with an automatic lubrication and cooling system.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute prior art. Summary of the Invention

[0004] The inventor found through research that the commonly installed wet brakes on a single axle have technical problems such as poor lubrication and cooling of the brakes, overloading and overheating of the drive axle brakes, resulting in excessive wear and seal burning during long-distance heavy-duty braking.

[0005] In view of at least one of the above technical problems, the present disclosure provides a wet drive axle integrated with an automatic lubrication and cooling system, and the specific technical solutions are as follows:

[0006] A wet drive axle integrated with an automatic lubrication and cooling system, comprising a torque transmission unit, the torque transmission unit is provided with a transmission shaft Ⅰ, the outer wall of the transmission shaft Ⅰ is provided with a front bearing and a rear bearing, the front bearing is provided with a temperature sensor, the other end of the transmission shaft Ⅰ is provided with a transmission bevel gear, the transmission bevel gear is linked with a driven bevel gear, the middle of the driven bevel gear is provided with a differential assembly, the outside of the driven bevel gear and the differential assembly is provided with a bridge housing, both ends of the differential assembly are respectively provided with output half shafts, the outer ends of the output half shafts are provided with planetary transmission assemblies, the planetary transmission assemblies are linked with hub assemblies, the hub assemblies are provided with multi-disc wet brake assemblies, and the multi-disc wet brake assemblies are provided with temperature sensors; a pump speed increasing gear Ⅰ is arranged in the middle of the transmission shaft Ⅰ, the pump speed increasing gear Ⅰ is linked with a pump speed increasing gear Ⅱ, the pump speed increasing gear Ⅱ is provided with a transmission shaft Ⅱ, the transmission shaft Ⅱ includes a clutch, the other end of the transmission shaft Ⅱ is connected to an oil pump, the oil pump is provided with an oil sump, the oil outlet of the oil pump is connected to an electromagnetic reversing valve, the clutch and the electromagnetic reversing valve are electrically connected to a controller assembly, the discharge ends of the electromagnetic reversing valve are respectively connected to the front bearing and the multi-disc wet brake assembly through oil pipelines, when the relevant parts of the drive axle brake are overheated measured by the temperature sensor, the controller assembly controls the clutch to close to drive the oil pump to work, and the electromagnetic reversing valve can be adjusted as required under the control of the controller assembly, so as to realize the automatic lubrication and cooling of the relevant parts.

[0007] In some embodiments of the present disclosure, the transmission bevel gear is externally meshed with the driven bevel gear, which increases the utilization rate of the transmission space and makes the transmission structure more compact.

[0008] In some embodiments of the present disclosure, both the pump speed increasing gear Ⅰ and the pump speed increasing gear Ⅱ are spur gears, the pump speed increasing gear Ⅰ is externally meshed with the pump speed increasing gear Ⅱ, the transmission efficiency is high, and the parts are convenient for production, procurement and maintenance.

[0009] In some embodiments of the present disclosure, the oil sump is arranged at the lower part of the bridge housing, the oil pump and the oil sump are connected by an oil pipeline, and a check valve Ⅰ for preventing backflow is arranged on the oil pipeline of the oil connection.

[0010] In some embodiments of the present disclosure, a check valve Ⅱ for preventing backflow is arranged on the oil pipeline connecting the oil pump and the electromagnetic reversing valve.

[0011] In some embodiments of the present disclosure, an overflow system connecting the oil pipeline to the oil sump is arranged on the oil pipeline between the check valve Ⅱ and the electromagnetic reversing valve, and the overflow system includes an overflow valve, which further protects the hydraulic system and prolongs the service life of each component.

[0012] In some embodiments of the present disclosure, the oil pump is a bidirectional quantitative hydraulic pump, which is equipped with a forward oil circuit and a reverse oil circuit. At a certain moment, when the system is cooling and lubricating, a reversing condition occurs. At this time, the bidirectional quantitative hydraulic pump sucks oil from the original outlet hydraulic circuit and discharges oil from the original inlet, and continues to cool and lubricate the abnormal temperature parts, so that cooling will not be interrupted.

[0013] In some embodiments of the present disclosure, the solenoid reversing valve is a three-position three-way solenoid reversing valve.

[0014] In some embodiments of the present disclosure, the oil pipe of one discharge port of the three-position three-way solenoid reversing valve is divided into two branch oil pipes, and the two branch oil pipes are respectively connected to a multi-disc wet brake assembly, and a one-way valve III is provided on the branch oil pipe to prevent backflow.

[0015] In some embodiments of the present disclosure, the oil inlet pipeline of the oil pump is equipped with a filter to prevent the lubricating coolant from containing particulate debris before entering the oil pump, thereby extending the service life of the oil pump.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the temperature sensor measures that the relevant parts of the drive axle brake are overheated, the controller assembly controls the clutch to close and drive the oil pump to work. The electromagnetic reversing valve can be adjusted as needed under the control of the controller assembly, thereby realizing automatic lubrication and cooling of the relevant parts. The lubricating oil provided by the axle is used for automatic lubrication and self-cooling, which is timely and reliable, greatly extending the service life of the axle and achieving the purpose of reducing costs and increasing efficiency.

[0018] 2. Through the setting of the electromagnetic reversing valve, the lubricating oil can be delivered to a certain position or three positions at the same time to cool and lubricate the position according to the position of the temperature sensor signal. It has a high degree of automation and is not easy to cause waste of lubricating coolant.

[0019] 3. If the temperature sensor does not detect an abnormal temperature signal, the controller assembly disconnects the clutch to cancel the linkage between the oil pump and the transmission shaft I. On the one hand, this avoids energy waste and increases the output power of the bridge. On the other hand, it increases the service life of the oil pump and saves lubricating coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structural power transmission route of Example 3 of the present invention.

[0021] Description of reference numerals in the figure: 1, torque transmission unit; 11, drive shaft I; 111, front bearing; 112, rear bearing; 113, pump speed increasing gear I; 2, temperature sensor; 3, driving bevel gear; 4, driven bevel gear; 5, differential assembly; 51, output half shaft; 6, axle housing; 7, planetary transmission assembly; 71, wheel hub assembly; 72, multi-disc wet brake assembly; 81, pump speed increasing gear II; 82, drive shaft II; 821, clutch; 91, oil pump; 92, oil sump; 93, electromagnetic reversing valve; 94, controller assembly; 951, check valve I; 952, check valve II; 953, check valve III; 96, relief valve; 97, filter screen. Detailed implementation manners

[0022] In order to better understand the purpose, structure and function of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are a part rather than all of the embodiments of the present invention.

[0023] The serial numbers assigned to the components in this article, I, II, III, are only used to distinguish the objects described, and do not have any sequential or technical meanings. The "connection" mentioned in this disclosure, unless otherwise specifically stated, includes both direct and indirect "connections". In the description of the present application, it should be understood that the orientation terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and a brief description, rather than indicating or implying that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0024] Such as Figure 1As shown, a wet drive axle with an integrated automatic lubrication and cooling system is designed, including a torque transmission unit 1, which can be a gear, a flange, a shaft or other mechanical structure that can transmit torque. The torque transmission unit 1 is equipped with a transmission shaft Ⅰ11, and the outer wall of the transmission shaft Ⅰ11 is interference-fitted with a front bearing 111 and a rear bearing 112. The outer rings of the front bearing 111 and the rear bearing 112 are relatively fixedly matched with the housing of the present invention, so that the transmission shaft Ⅰ11 can rotate circumferentially, the front bearing 111 is equipped with a temperature sensor 2, and the other end of the transmission shaft Ⅰ11 is equipped with a transmission bevel gear 3, and the transmission bevel gear 3 is linked There is a passive bevel gear 4, and the matching connection of the bevel gears can further reduce the overall volume and weight of the present disclosure. A differential assembly 5 is provided in the middle of the passive bevel gear 4, and a bridge housing 6 is provided outside the passive bevel gear 4 and the differential assembly 5. Output half shafts 51 are provided at both ends of the differential assembly 5, and a planetary transmission assembly 7 is provided at the outer end of the output half shaft 51. The planetary transmission assembly 7 can be a multi-stage planetary transmission assembly. The planetary transmission assembly 7 is linked to the wheel hub assembly 71, and the wheel hub assembly 71 is provided with a multi-plate wet brake assembly 72. The multi-plate wet brake assembly 72 is provided with a temperature sensor 2; the middle of the transmission shaft Ⅰ11 It is equipped with a pump speed increasing gear Ⅰ113, which is linked with a pump speed increasing gear Ⅱ81. The pump speed increasing gear Ⅱ81 is equipped with a transmission shaft Ⅱ82, which includes a clutch 821. The other end of the transmission shaft Ⅱ82 is connected with an oil pump 91, which is equipped with an oil pool 92. The oil outlet of the oil pump 91 is connected with an electromagnetic reversing valve 93. Through the setting of the electromagnetic reversing valve 93, it can be determined according to the position of the temperature sensor 2 signal to deliver lubricating oil to a certain position or three positions at the same time to cool and lubricate the position. The degree of automation is high and it is not easy to cause waste of lubricating coolant; the clutch 821 and the electromagnetic The circuit of the reversing valve 93 is connected to the controller assembly 94. The discharge end of the electromagnetic reversing valve 93 is connected to the front bearing 111 and the multi-plate wet brake assembly 72 through the oil pipe oil circuit. When the temperature sensor 2 measures that the relevant parts of the drive axle brake are overheated, the controller assembly 94 controls the clutch 821 to close and drive the oil pump 91 to work. The electromagnetic reversing valve 93 can be adjusted as needed under the control of the controller assembly 94, thereby realizing automatic lubrication and cooling of the relevant parts, and using the lubricating oil of the axle for automatic lubrication and self-cooling, which is timely and reliable, greatly prolongs the service life of the axle, and achieves the purpose of reducing costs and increasing efficiency.

[0025] During use, lubricating coolant is injected into the oil sump 92. The drive motor is turned on. The drive motor provides torque to the torque transmission unit 1. The torque transmission unit 1 drives the transmission shaft I 11 in tandem. The transmission shaft I 11 drives the pump speed increasing gear I 113 and the transmission bevel gear 3 in tandem. The transmission bevel gear 3 drives the driven bevel gear 4 in tandem. The driven bevel gear 4 drives the differential assembly 5 in tandem. The differential assembly 5 drives the output half shaft 51 in tandem. The output half shaft 51 drives the planetary transmission assembly 7 in tandem. The planetary transmission assembly 7 drives the hub assembly 71 in tandem. The multi-disc wet brake assembly 72 acts on the hub assembly 71 when braking is required to achieve the braking and deceleration function. When the corresponding temperature sensors 2 at the front bearing 111 and / or the multi-disc wet brake assembly 72 detect abnormal temperatures, they transmit electrical signals to the controller assembly 94. The controller assembly 94 controls the clutch 821 to close. Then the transmission shaft II 82 can transmit the kinetic energy of the pump speed increasing gear II 81 to the oil pump 91. The oil pump 91 starts to operate. The oil pump 91 extracts the lubricating coolant from the oil sump 92 through the pipeline and delivers it to the electromagnetic directional control valve 93. The controller assembly 94 judges the position of the abnormal temperature according to the electrical signals transmitted by the temperature sensors 2 and controls the electromagnetic directional control valve 93 to select an appropriate position as needed to make the corresponding oil circuit unblocked, thereby achieving lubrication and cooling at this place. If the temperature sensors 2 do not detect abnormal temperature signals, the controller assembly 94 controls the clutch 821 to disengage. The transmission shaft II 82 loses its transmission function, disconnecting the oil pump 91 and the transmission shaft I 11. On the one hand, this avoids waste of energy consumption and increases the output power of the axle. On the other hand, it improves the service life of the oil pump 91 and saves lubricating coolant. After the lubricating coolant cools and lubricates the front bearing 111 and / or the multi-disc wet brake assembly 72 through the oil pipe, it returns to the oil sump 92 through the gaps in the various structures inside the axle housing 6 to form a circulation loop.

[0026] In the above embodiments, 3 embodiments are listed to implement the above technical solutions:

[0027] Embodiment 1

[0028] The present embodiment discloses a wet drive axle with an integrated automatic lubrication and cooling system, including a torque transmission unit 1. The torque transmission unit 1 disclosed in the present embodiment is an input flange. The input flange has reliable transmission motion, constant instantaneous transmission ratio, high use efficiency, long service life, compact structure, and small outer dimensions. It can effectively reduce the overall volume and weight of the present invention, and is more in line with the purpose of energy conservation and emission reduction. The torque transmission unit 1, that is, the spline hole in the middle of the input flange is equipped with a transmission shaft Ⅰ11, and the outer wall of the transmission shaft Ⅰ11 is interference-fitted with a front bearing 111 and a rear bearing 112. The outer rings of the front bearing 111 and the rear bearing 112 are relatively fixedly matched with the housing of the present invention, so that the transmission The shaft Ⅰ11 can rotate in the circumferential direction, the front bearing 111 is equipped with a temperature sensor 2, the other end of the transmission shaft Ⅰ11 is equipped with a transmission bevel gear 3, the transmission bevel gear 3 is linked with a passive bevel gear 4, the matching connection of the bevel gears can further reduce the overall volume and weight of the present disclosure, the middle of the passive bevel gear 4 is equipped with a differential assembly 5, the outside of the passive bevel gear 4 and the differential assembly 5 are equipped with a bridge housing 6, the two ends of the differential assembly 5 are respectively equipped with output half shafts 51, the outer end of the output half shaft 51 is equipped with a planetary transmission assembly 7, the planetary transmission assembly 7 can be a multi-stage planetary transmission assembly, the planetary transmission assembly 7 is linked with a hub assembly 71, and the hub assembly 71 is equipped with multiple wet The multi-plate wet brake assembly 72 is provided with a temperature sensor 2; a pump speed increasing gear Ⅰ113 is provided in the middle of the transmission shaft Ⅰ11, and the pump speed increasing gear Ⅰ113 is linked with a pump speed increasing gear Ⅱ81, and the pump speed increasing gear Ⅱ81 is provided with a transmission shaft Ⅱ82, and the transmission shaft Ⅱ82 includes a clutch 821, and the other end of the transmission shaft Ⅱ82 is connected with an oil pump 91, and the oil pump 91 is provided with an oil pool 92, and the oil outlet of the oil pump 91 is connected with an electromagnetic reversing valve 93. Through the setting of the electromagnetic reversing valve 93, it can be determined according to the position of the temperature sensor 2 signal to deliver lubricating oil to a certain position or three positions at the same time to cool and lubricate the position, with a high degree of automation and not easy to cause The clutch 821 and the electromagnetic reversing valve 93 are connected to the controller assembly 94, and the discharge end of the electromagnetic reversing valve 93 is connected to the front bearing 111 and the multi-plate wet brake assembly 72 through the oil pipe. When the temperature sensor 2 measures that the relevant parts of the drive axle brake are overheated, the controller assembly 94 controls the clutch 821 to close and drive the oil pump 91 to work. The electromagnetic reversing valve 93 can be adjusted as needed under the control of the controller assembly 94, thereby realizing automatic lubrication and cooling of the relevant parts, and using the lubricating oil of the axle for automatic lubrication and self-cooling, which is timely and reliable, greatly prolongs the service life of the axle, and achieves the purpose of reducing costs and increasing efficiency.

[0029] Among them, the driving bevel gear 3 is externally meshed with the driven bevel gear 4, increasing the utilization rate of the transmission space and making the transmission structure more compact; the pump speed increasing gear I 113 and the pump speed increasing gear II 81 are both spur gears, and the pump speed increasing gear I 113 is externally meshed with the pump speed increasing gear II 81, with high transmission efficiency, and the components are convenient for production, procurement and maintenance; the inlet pipeline of the oil pump 91 is provided with a filter screen 97, which can keep the lubricating coolant free of particulate debris before entering the oil pump 91 and extend the service life of the oil pump 91.

[0030] Embodiment 2

[0031] This embodiment discloses a wet drive axle integrated with an automatic lubrication and cooling system. The difference between this embodiment and Embodiment 1 is that the oil sump 92 is arranged at the lower part of the axle housing 6, the oil pump 91 and the oil sump 92 are connected by an oil circuit, and a check valve I 951 for preventing backflow is arranged on the pipeline of the oil circuit connection; a check valve II 952 for preventing backflow is arranged on the pipeline where the oil pump 91 and the electromagnetic directional valve 93 are connected by an oil circuit; an overflow system connecting the oil sump 92 is arranged on the pipeline between the check valve II 952 and the electromagnetic directional valve 93. The overflow system includes an overflow valve 96, which further protects the hydraulic system and extends the service life of each component.

[0032] Embodiment 3

[0033] This embodiment discloses a wet drive axle integrated with an automatic lubrication and cooling system. The difference between this embodiment and Embodiment 1 is that the oil pump 91 is a bidirectional fixed-displacement hydraulic pump. The bidirectional fixed-displacement hydraulic pump is provided with a forward oil circuit and a reverse oil circuit. Each of the two oil ports of the bidirectional fixed-displacement hydraulic pump has an oil circuit connecting the oil sump 92 and the electromagnetic directional valve 93. As Figure 1 shown, in the case of cooling and lubricating the system, a reverse driving condition may occur. At this time, the bidirectional fixed-displacement hydraulic pump changes the liquid extraction direction, sucks oil from the original outlet end hydraulic circuit, and discharges oil from the original inlet end, and continues to cool and lubricate the abnormally hot part, so that the cooling and lubrication will not be interrupted. The electromagnetic directional valve 93 is a three-position three-way electromagnetic directional valve; the oil pipe at one discharge port of the three-position three-way electromagnetic directional valve is divided into two branch oil pipes, and the two branch oil pipes are respectively connected to a multi-disc wet brake assembly 72 by an oil circuit, and a check valve III 953 for preventing backflow is arranged on the branch oil pipe. The other discharge port is connected to a single oil pipe directly facing the front bearing 111. The cooling and lubrication of the front bearing 111 and the multi-disc wet brake assembly 72 are respectively realized as required through the passages of the two discharge ports of the three-position three-way electromagnetic directional valve.

[0034] It will be understood that the present invention is described by way of some embodiments, and those skilled in the art will be aware that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A wet drive axle integrated with an automatic lubrication and cooling system, characterized in that, It includes a torque transmission unit (1). The torque transmission unit (1) is provided with a transmission shaft I (11). The outer wall of the transmission shaft I (11) is provided with a front bearing (111) and a rear bearing (112). The front bearing (111) is provided with a temperature sensor (2). The other end of the transmission shaft I (11) is provided with a driving bevel gear (3). The driving bevel gear (3) is linked with a driven bevel gear (4). The middle of the driven bevel gear (4) is provided with a differential assembly (5). The outside of the driven bevel gear (4) and the differential assembly (5) is provided with a axle housing (6). Both ends of the differential assembly (5) are respectively provided with output half shafts (51). The outer ends of the output half shafts (51) are provided with a planetary transmission assembly (7). The planetary transmission assembly (7) is linked with a wheel hub assembly (71). The wheel hub assembly (71) is provided with a multi-disc wet brake assembly (72). The multi-disc wet brake assembly (72) is provided with a temperature sensor (2). The middle of the transmission shaft I (11) is provided with a pump speed increasing gear I (113). The pump speed increasing gear I (113) is linked with a pump speed increasing gear II (81). The pump speed increasing gear II (81) is provided with a transmission shaft II (82). The transmission shaft II (82) includes a clutch (821). The other end of the transmission shaft II (82) is connected to an oil pump (91). The oil pump (91) is provided with an oil sump (92). The oil outlet of the oil pump (91) is connected to an electromagnetic reversing valve (93). The clutch (821) and the electromagnetic reversing valve (93) are electrically connected to a controller assembly (94). The discharge end of the electromagnetic reversing valve (93) is respectively connected to the front bearing (111) and the multi-disc wet brake assembly (72) through oil pipe oil circuits.

2. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 1, wherein The driving bevel gear (3) is externally meshed with the driven bevel gear (4).

3. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 1, characterized in that, Both the pump speed increasing gear I (113) and the pump speed increasing gear II (81) are spur gears, and the pump speed increasing gear I (113) is externally meshed with the pump speed increasing gear II (81).

4. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 1, characterized in that, The oil sump (92) is arranged at the lower part of the axle housing (6). The oil pump (91) and the oil sump (92) are oil circuit connected, and a check valve I (951) for preventing backflow is arranged on the oil circuit connecting pipeline.

5. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 4, characterized in that, A check valve II (952) for preventing backflow is arranged on the pipeline where the oil pump (91) and the electromagnetic reversing valve (93) are oil circuit connected.

6. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 5, characterized in that, An overflow system for connecting the oil circuit to the oil sump (92) is arranged on the pipeline between the check valve II (952) and the electromagnetic reversing valve (93). The overflow system includes an overflow valve (96).

7. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 1 or 4, characterized in that, The oil pump (91) is a two-way fixed-displacement hydraulic pump, and the two-way fixed-displacement hydraulic pump is provided with a forward oil circuit and a reverse oil circuit.

8. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 1, characterized in that, The electromagnetic reversing valve (93) is a three-position three-way electromagnetic reversing valve.

9. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 8, characterized in that, The oil pipe at one discharge port of the three-position three-way electromagnetic reversing valve is divided into two branch oil pipes, and the two branch oil pipes are respectively oil circuit connected to a multi-disc wet brake assembly (72), and check valves III (953) for preventing backflow are arranged on the branch oil pipes.

10. The wet drive axle integrated with an automatic lubrication and cooling system according to claim 1, characterized in that, A filter screen (97) is arranged on the oil inlet pipeline of the oil pump (91).

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