A lubrication and cooling system for a hydraulic transmission box bridge of a forklift

Abstract

The present invention relates to the technical field of forklifts, and specifically to a lubrication and cooling system for a hydraulic transmission box bridge of a forklift. It includes a gearbox, a wet drive axle, a radiator, a gear pump, and an oil suction diverter valve; the hydraulic oil in the gearbox oil pool and the drive axle oil pool is regulated by the oil suction diverter valve, one way of entering the clutch piston, and the other way of obtaining cooling oil after cooling through the radiator; the cooling oil is regulated by the return oil diverter valve, one way of returning to the drive axle oil pool through the shell cavity of the drive axle, and the other way of first entering the clutch shell cavity, and then returning to the gearbox oil pool through the shell cavity of the drive axle. Therefore, the system of the present invention enables the drive axle cooling system A and the gearbox cooling system B, which were originally independent of each other, to complement each other to achieve a more balanced heat dissipation effect, which has a simple structure, low cost, and good heat dissipation effect.

Description

Technical Field

[0001] The invention relates to the technical field of forklifts, in particular to a lubrication and cooling system for a hydraulic transmission box bridge of a forklift. Background Art

[0002] At present, forklifts can be divided into mechanical transmission and hydraulic transmission according to the gearbox, and can be divided into dry brake and wet brake according to the braking system. With the improvement of forklift working efficiency, hydraulic gearbox and wet brake drive axle are generally used in forklifts under harsh working conditions.

[0003] The hydraulic transmission needs to provide a separate cooling system A for the torque converter, and provide lubrication and cooling for the transmission gears and bearings, which requires a separate pump and radiator; the wet brake drive axle also needs to provide a separate cooling system B for the brakes, and provide lubrication and cooling for the drive axle gears and bearings, which also requires a separate pump and radiator;

[0004] The two cooling systems have different heat dissipation requirements under different working conditions: in high-speed transportation conditions, the engine and torque converter speeds are very high. Because the torque converter is always in the high-speed and low-efficiency zone, the heat generated is large, and the requirements for the torque converter cooling system A are very high. However, the brakes rarely work at this time, so the brake cooling system B almost does not need to work, and the heat dissipation requirements are low at this time; on the contrary, in low-speed transportation conditions, the brakes need to be braked and started frequently, and the heat dissipation requirements of the cold cutting system B are very large. Due to frequent reversing and braking, the speeds of the engine and torque converter are always at medium and low speeds, the torque converter efficiency is relatively high, and the heat dissipation requirements of the cold cutting system A are not large.

[0005] The two cooling systems A and B each have a separate pump source and a separate radiator. In accordance with different working conditions, cooling system A and cooling system B can only be strengthened for each working condition. Generally, the radiator area is increased, or the radiator level is increased. Therefore, the radiator structure is very complicated and difficult to arrange. Because of the different pump sources, the piping structure is complicated and the cost is high. In addition, a defective heat dissipation component will cause serious failure, which requires disassembly and repair, which is time-consuming and labor-intensive. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a lubrication and cooling system for a hydraulic transmission box axle of a forklift. The system uses only one pump source and cools the torque converter of the transmission and the brake of the drive axle at the same time, achieving a more balanced heat dissipation effect under different working conditions.

[0007] The specific technical scheme is as follows: A lubrication and cooling system for a hydraulic transmission box bridge of a forklift, comprising a gearbox 1, a wet drive axle 2, a radiator 3, a gear pump 11 and an oil suction diverter valve 5;

[0008] The inlet of the oil suction diverter valve 5 is connected to the oil outlet of the gearbox oil pool 17 and the oil outlet of the drive axle oil pool 24 through pipelines, and the outlet of the oil suction diverter valve 5 is connected to the inlet of the gear pump 11 through a pipeline. The outlet of the gear pump 11 is divided into two paths, one of which is connected to the clutch piston 18 through the micro valve 13 and the shift valve 14 pipelines in sequence, and the other is connected to the inlet of the torque converter 16 through the main relief valve 12 and the torque conversion inlet valve 15 pipelines in sequence;

[0009] The outlet of the torque converter 16 is connected to the inlet of the return oil diverter valve 4 through the radiator 3 pipeline. The outlet of the return oil diverter valve 4 is divided into two paths, one of which is connected to the top inlet of the housing cavity of the drive axle 2 through a pipeline, and the other is connected to the top inlet of the housing cavity of the clutch through a pipeline. The housing cavity outlet of the clutch is connected to the top inlet of the housing cavity of the drive axle 2 through a pipeline.

[0010] When the system is working, the hydraulic oil in the transmission oil pool 17 and the drive axle oil pool 24 has its flow rate regulated by the oil suction diverter valve 5, one way of the hydraulic oil enters the clutch piston, and the other way is cooled by the radiator 3 to obtain cooling oil; the cooling oil has its flow rate regulated by the oil return diverter valve 4, one way of the hydraulic oil returns to the drive axle oil pool 24 through the shell cavity of the drive axle 2, and the other way first enters the shell cavity of the clutch, and then returns to the transmission oil pool 17 through the shell cavity of the drive axle 2.

[0011] Furthermore, the lubrication and cooling system also includes an oil level balance pipe 6, one end of which is connected to the transmission oil pool 17, and the other end is connected to the drive axle oil pool 24, and the oil level balance pipe 6 is located below the lowest oil level of the transmission oil pool 17 and the drive axle oil pool 24.

[0012] Further, the oil return diverter valve 4 comprises an oil return valve body 41, a cylindrical valve core 42 and a mounting plate 45, an oil inlet pipe 48 is vertically arranged on one side of the oil return valve body 41, and an upper oil outlet pipe 43 and a lower oil outlet pipe 431 are vertically arranged in parallel on adjacent sides, and the oil inlet of the upper oil outlet pipe 43 and the oil inlet of the lower oil outlet pipe 431 are respectively connected with the oil inlet pipe 48 in the oil return valve body 41;

[0013] The valve core 42 is vertically inserted into the oil return valve body 41 and is sealed in the oil return valve body 41 through a sealing plug 44;

[0014] The valve core 42 vertically penetrates the upper oil outlet pipe 43 and the lower oil outlet pipe 431 in sequence, and an upper annular groove and a lower annular groove are respectively provided on the outer cylindrical surface of the valve core 42 corresponding to the upper oil outlet pipe 43 and the lower oil outlet pipe 431, so that the diameter of the valve core 42 corresponding to the upper annular groove is smaller than the diameter of the upper oil outlet pipe 43, and the diameter of the valve core 42 corresponding to the lower annular groove is smaller than the diameter of the lower oil outlet pipe 431. The oil output of the upper oil outlet pipe 43 and the lower oil outlet pipe 431 can be adjusted by adjusting the height of the valve core 42.

[0015] Furthermore, the height of the upper annular groove is greater than the diameter of the upper oil outlet pipe 43, and the height of the lower annular groove is greater than the diameter of the lower oil outlet pipe 431;

[0016] The upper and lower ends of the valve core 42 are each provided with more than three adjusting gaskets 46. By increasing or decreasing the number of adjusting gaskets 46 at the upper and lower ends of the valve core 42, the height of the valve core 42 is adjusted, thereby changing the oil output of the upper oil outlet pipe 43 and the lower oil outlet pipe 431.

[0017] Furthermore, the sector plate 25 of the driving axle 2 is fixedly connected to the forklift frame by means of a large bolt 8 and a hexagonal nut 81 with a flange surface;

[0018] One end of the mounting plate 45 is locked and fixed by bolts and the oil return valve body 41, and the other end of the mounting plate 45 is sleeved outside the hexagonal nut 81, and the fixing plate 410 with a hexagonal hole is sleeved outside the hexagonal nut 81, and is locked by the fastening nut 49 and the large bolt 8 stud, so that the mounting plate 45 and the sector plate 25 are fixedly connected.

[0019] A clamping plate 47 is disposed on the outer sleeve of the corresponding large bolt 8 between the mounting plate 45 and the fastening nut 49 .

[0020] Furthermore, the oil suction diverter valve 5 comprises a diverter valve body, and a drive axle oil inlet pipe 51, a gearbox oil inlet pipe 54 and an oil outlet pipe 53 are respectively arranged vertically on three adjacent sides of the diverter valve body.

[0021] The oil outlet of the drive axle oil inlet pipe 51 and the oil outlet of the gearbox oil inlet pipe 54 are respectively connected with the oil inlet of the oil outlet pipe 53 in the diverter valve body, and the drive axle oil inlet pipe 51 is equipped with a first annular throttling plug 52, and the gearbox oil inlet pipe 54 is equipped with a second annular throttling plug 55.

[0022] Furthermore, the oil outlet of the drive axle oil pool 24 and the oil outlet of the transmission oil pool 17 are respectively provided with an oil suction filter 7 .

[0023] The beneficial technical effects of the present invention are as follows:

[0024] 1. The lubrication and cooling system of the present invention uses a gear pump to draw hydraulic oil from the gearbox oil pool and the drive axle oil pool respectively through an oil suction diverter valve. One path provides lubrication and cooling hydraulic oil for the torque converter of the gearbox, and the other path provides pressure hydraulic oil for the piston of the clutch. The hydraulic oil coming out of the torque converter is cooled by a radiator to obtain cooling oil. The cooling oil passes through an oil return diverter valve to provide lubrication and cooling hydraulic oil for the gears, bearings and brakes of the drive axle, and the other path provides lubrication and cooling hydraulic oil for the clutch, gears and bearings of the gearbox. The system uses a gear pump as the only pump source and a radiator as a single heat dissipation component to realize the system function, so that the system structure is simple and the layout is convenient.

[0025] 2. The lubrication and cooling system of the present invention can adjust the heat dissipation of the system under different working conditions of the forklift, which is beneficial to the overall heat dissipation of the system: when the forklift is in high-speed transportation conditions, the brake of the drive axle does not brake and basically does not generate heat, and the torque converter of the gearbox is in a low-efficiency zone and generates a large amount of heat. At this time, the oil temperature of the gearbox oil pool is higher than the oil temperature of the drive axle oil pool, and the hydraulic oil of the gearbox oil pool and the drive axle oil pool are mixed through the oil suction diverter valve; when the forklift is in low-speed transportation conditions, the brake of the drive axle generates a large amount of heat, and the torque converter is in a high-efficiency zone and generates a small amount of heat. At this time, the oil temperature of the drive axle oil pool is higher than the oil temperature of the gearbox oil pool, and the hydraulic oil of the gearbox oil pool and the drive axle oil pool are mixed through the oil suction diverter valve;

[0026] Therefore, the system of the present invention can first reduce the oil temperature by mixing the hydraulic oil in the drive axle oil pool and the transmission oil pool, and then further dissipate the heat and cool it through the radiator, so that the originally independent drive axle cooling system A and the transmission cooling system B complement each other to achieve a more balanced heat dissipation effect. This has a simple structure, low cost and good heat dissipation effect.

[0027] 3. The return oil diverter valve of the system of the present invention not only diverts the cooling oil obtained through the radiator into two paths, one path goes to the shell cavity of the drive axle to lubricate and cool the brakes, gears and bearings of the drive axle, and the other path goes to the shell cavity of the clutch and the shell cavity of the gearbox to lubricate and cool the clutch, gears and bearings of the gearbox; the return oil diverter valve can also adjust the flow rate of the cooling oil in the two paths. When the oil temperature in the drive axle oil pool is higher than the oil temperature in the gearbox oil pool, the return oil diverter valve adjusts the amount of cooling oil going to the drive axle shell cavity to increase, and the amount of cooling oil going to the clutch shell cavity and the gearbox shell cavity to decrease, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the lubrication and cooling system of the present invention.

[0029] Figure 2 It is a front view of the oil return diverter valve of the present invention.

[0030] Figure 3 for Figure 2 AA section view.

[0031] Figure 4 for Figure 2 Top view of the .

[0032] Figure 5 This is a diagram showing the installation and use status of the oil return diverter valve of the present invention.

[0033] Figure 6 It is a front view of the oil suction diverter valve of the present invention.

[0034] Figure 7 for Figure 6 DD cross-sectional view.

[0035] Figure 8 for Figure 6 BB cross-sectional view.

[0036] Fig. 9 This is a diagram of the installation and use status of the present invention on a forklift.

[0037] Among them: 1 gearbox, 11 gear pump, 12 main overflow valve, 13 micro valve, 14 shift valve, 15 torque converter inlet valve, 16 torque converter, 17 gearbox oil pool, 18 piston, 2 drive axle, 21 gear, 22 bearing, 23 brake, 24 drive axle oil pool, 3 radiator, 4 return oil diverter valve, 41 return oil valve body, 42 valve core, 43 upper oil outlet pipe, 431 lower oil outlet pipe, 44 sealing plug, 45 mounting plate, 46 adjusting gasket, 48 oil inlet pipe, 5 oil suction diverter valve, 51 drive axle oil inlet pipe, 52 first throttle plug, 53 oil outlet pipe, 54 gearbox oil inlet pipe, 55 second throttle plug, 6 oil level balance pipe, 7 oil suction filter. DETAILED DESCRIPTION

[0038] To make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not intended to limit the present invention. Example

[0039] See Figure 1 , a lubrication and cooling system for a hydraulic transmission box bridge of a forklift, comprising a gearbox 1, a wet drive axle 2, a radiator 3, a gear pump 11 and an oil suction diverter valve 5;

[0040] The inlet of the oil suction diverter valve 5 is connected to the oil outlet of the gearbox oil pool 17 and the oil outlet of the drive axle oil pool 24 through pipelines, and the outlet of the oil suction diverter valve 5 is connected to the inlet of the gear pump 11 through a pipeline. The outlet of the gear pump 11 is divided into two paths, one of which is connected to the clutch piston 18 through the micro valve 13 and the shift valve 14 pipelines in sequence, and the other is connected to the inlet of the torque converter 16 through the main overflow valve 12 and the torque conversion inlet valve 15 pipelines in sequence;

[0041] The outlet of the torque converter 16 is connected to the inlet of the return oil diverter valve 4 through the radiator 3 pipeline. The outlet of the return oil diverter valve 4 is divided into two paths, one of which is connected to the top inlet of the housing cavity of the drive axle 2 through a pipeline, and the other is connected to the top inlet of the housing cavity of the clutch through a pipeline. The housing cavity outlet of the clutch is connected to the top inlet of the housing cavity of the drive axle 2 through a pipeline.

[0042] When the system is working, the hydraulic oil in the gearbox oil pool 17 and the drive axle oil pool 24 is adjusted by the oil suction diverter valve 5. One way is to enter the clutch piston 18 through the micro valve 13 and the shift valve 14 to provide pressure oil for the piston 18. The other way is to enter the torque converter 16 through the main relief valve 12 and the torque conversion inlet valve 15. The shift valve 14 and the main relief valve 12 are adjusted comprehensively to keep the oil pressure from the oil suction diverter valve 5 to the gear piston 18 at 1.1-1.5MPa. The micro valve 13 further reduces the oil pressure of the gear piston 18 to realize the micro-motion function of the whole vehicle. The torque conversion inlet valve 15 ensures that the oil pressure from the oil suction diverter valve 5 to the torque converter 16 does not exceed 0.5-0.7MPa.

[0043] The hydraulic oil coming out of the torque converter 16 is cooled by the radiator 3 to obtain cooling oil; the cooling oil is adjusted in flow by the return oil diverter valve 4, one way of the cooling oil returns to the drive axle oil pool 24 through the shell cavity of the drive axle 2, and the other way first enters the shell cavity of the clutch, and then returns to the gearbox oil pool 17 through the shell cavity of the drive axle 2.

[0044] When the oil temperature in the drive axle oil pool 24 is higher than the oil temperature in the transmission oil pool 17, the return oil diverter valve 4 adjusts the amount of cooling oil going to the drive axle 2 shell cavity to increase, and the amount of cooling oil going to the clutch shell cavity and the transmission 1 shell cavity to decrease, and vice versa.

[0045] The lubrication and cooling system further includes an oil level balance pipe 6, one end of which is connected to the gearbox oil pool 17, and the other end is connected to the drive axle oil pool 24, and the oil level balance pipe 6 is located below the lowest oil level of the gearbox oil pool 17 and the drive axle oil pool 24. This ensures that there is no large drop in the oil level of the drive axle oil pool 24 and the gearbox oil pool 17, avoids the gear pump 11 from sucking air, and ensures the reliability of the system.

[0046] See Figure 2 to Figure 4 The return oil diverter valve 4 includes a return oil valve body 41, a cylindrical valve core 42 and a mounting plate 45. One end of the mounting plate 45 is locked and fixed to the return oil valve body 41 by bolts, and the other end of the mounting plate 45 is fixed to the fan plate of the drive axle 2.

[0047] An oil inlet pipe 48 is vertically arranged on one side of the oil return valve body 41, and an upper oil outlet pipe 43 and a lower oil outlet pipe 431 are vertically arranged on the adjacent side, and the oil inlet of the upper oil outlet pipe 43 and the oil inlet of the lower oil outlet pipe 431 are respectively connected to the oil inlet pipe 48 in the oil return valve body 41;

[0048] The valve core 42 is vertically inserted on the oil return valve body 41, and passes through the upper oil outlet pipe 43 and the lower oil outlet pipe 431 in sequence. The upper and lower ends of the valve core 42 are provided with sealing plugs 44. The oil output of the upper oil outlet pipe 43 and the lower oil outlet pipe 431 can be adjusted by adjusting the height of the valve core 42.

[0049] An upper annular groove and a lower annular groove are respectively formed on the outer cylindrical surface of the valve core 42 corresponding to the upper oil outlet pipe 43 and the lower oil outlet pipe 431. The diameter of the valve core 42 corresponding to the upper annular groove is smaller than the diameter of the upper oil outlet pipe 43, and the diameter of the valve core 42 corresponding to the lower annular groove is smaller than the diameter of the lower oil outlet pipe 431. The height of the upper annular groove is greater than the diameter of the upper oil outlet pipe 43, and the height of the lower annular groove is greater than the diameter of the lower oil outlet pipe 431.

[0050] The upper and lower ends of the valve core 42 are each provided with more than three adjusting gaskets 46. By increasing or decreasing the number of adjusting gaskets 46 at the upper and lower ends of the valve core 42, the height of the valve core 42 is adjusted, thereby changing the oil output of the upper oil outlet pipe 43 and the lower oil outlet pipe 431.

[0051] See Figure 5 The sector plate 25 of the driving axle 2 is fixedly connected to the forklift frame by means of a large bolt 8 and a hexagonal nut 81 with a flange surface;

[0052] One end of the mounting plate 45 is locked and fixed by bolts and the oil return valve body 41, and the other end of the mounting plate 45 is sleeved outside the hexagonal nut 81, and the fixing plate 410 with a hexagonal hole is sleeved outside the hexagonal nut 81, and is locked by the fastening nut 49 and the large bolt 8 stud, so that the mounting plate 45 and the sector plate 25 are fixedly connected.

[0053] A clamping plate 47 is disposed on the outer sleeve of the corresponding large bolt 8 between the mounting plate 45 and the fastening nut 49 .

[0054] See Figure 6 to Figure 8 The oil suction diverter valve 5 includes a diverter valve body, and a drive axle oil inlet pipe 51, a gearbox oil inlet pipe 54 and an oil outlet pipe 53 are respectively vertically arranged on three adjacent sides of the diverter valve body. The oil outlet of the drive axle oil inlet pipe 51 and the oil outlet of the gearbox oil inlet pipe 54 are respectively connected with the oil inlet of the oil outlet pipe 53 in the diverter valve body, and a first throttling plug 52 is provided in the drive axle oil inlet pipe 51, and a second throttling plug 55 is provided in the gearbox oil inlet pipe 54.

[0055] The oil output of the drive axle oil inlet pipe 51 and the transmission oil inlet pipe 54 can be changed by changing the size of the intermediate apertures of the first throttle plug 52 and the second throttle plug 55 .

[0056] The oil outlet of the drive axle oil pool 24 and the oil outlet of the transmission oil pool 17 are respectively provided with an oil suction filter 7 to filter impurities.

[0057] The lubrication cooling system of the present invention can adjust the heat dissipation of the system under different working conditions of the forklift, which is beneficial to the overall heat dissipation of the system: 1. When the forklift is in high-speed transportation condition, the brake 22 of the drive axle 2 is not braking and basically does not generate heat. The torque converter 16 of the gearbox 1 is in a low-efficiency area and generates a large amount of heat. At this time, the oil temperature of the gearbox oil pool 17 is 90°C, and the oil temperature of the drive axle oil pool 24 is 60°C. The hydraulic oils of the gearbox oil pool 17 and the drive axle oil pool 24 are mixed through the oil suction diverter valve 5 to obtain a system oil temperature of 75°C;

[0058] The gear pump 11 sucks out the hydraulic oil at 75°C, one way of which provides lubricating and cooling hydraulic oil for the torque converter 16 of the gearbox 1, and the other way of which provides pressurized hydraulic oil for the piston 18 of the clutch. The hydraulic oil coming out of the torque converter 16 is cooled by the radiator to obtain cooling oil at 60°C. The cooling oil passes through the return oil diverter valve 4, one way of which provides lubricating and cooling hydraulic oil for the gear 21, bearing 23 and brake 22 of the drive axle 2, and the other way of which provides lubricating and cooling hydraulic oil for the clutch, gear 21 and bearing 23 of the gearbox 1.

[0059] 2. When the forklift is in low-speed handling condition, the brake of the drive axle 2 generates a large amount of heat, and the torque converter 16 is in the high-efficiency zone with a small amount of heat. At this time, the oil temperature of the drive axle oil pool 24 is 100°C, and the oil temperature of the gearbox oil pool 17 is 70°C. The hydraulic oils of the gearbox oil pool 17 and the drive axle oil pool 24 are mixed through the oil suction diverter valve 5, and the oil temperature of the system is 85°C.

[0060] The gear pump 11 sucks out the hydraulic oil at 85°C, one way of which provides lubricating and cooling hydraulic oil for the torque converter 16 of the gearbox 1, and the other way of which provides pressurized hydraulic oil for the piston 18 of the clutch. The hydraulic oil coming out of the torque converter 16 is cooled by the radiator to obtain cooling oil at 70°C. The cooling oil passes through the return oil diverter valve 4, one way of which provides lubricating and cooling hydraulic oil for the gear 21, bearing 23 and brake 22 of the drive axle 2, and the other way of which provides lubricating and cooling hydraulic oil for the clutch, gear 21 and bearing 23 of the gearbox 1.

[0061] In the above two cases, the return oil diverter valve 4 can adjust the flow rate of the two cooling oil flows. When the oil temperature in the drive axle oil pool 24 is higher than the oil temperature in the transmission oil pool 17, the return oil diverter valve 4 adjusts the amount of cooling oil going to the drive axle 2 shell cavity to increase, and the amount of cooling oil going to the clutch shell cavity and the transmission 1 shell cavity to decrease. Conversely, when the oil temperature in the drive axle oil pool 24 is higher than the oil temperature in the transmission oil pool 17, the return oil diverter valve 4 adjusts the amount of cooling oil going to the drive axle 2 shell cavity to increase, so that the cooling oil flowing out of the radiator 3 further helps to cool the hydraulic oil in the transmission oil pool 17 or the drive axle oil pool 24.

[0062] Therefore, the system of the present invention enables the drive axle cooling system A and the transmission cooling system B, which were originally independent of each other, to complement each other, thereby achieving a more balanced heat dissipation effect. This has a simple structure, low cost, and good heat dissipation effect.

[0063] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lubrication and cooling system for a hydraulic transmission box bridge of a forklift, characterized in that: It comprises a gearbox (1), a wet drive axle (2), a radiator (3), a gear pump (11) and an oil suction diverter valve (5); The inlet of the oil suction diverter valve (5) is connected to the oil outlet of the gearbox oil pool (17) and the oil outlet of the drive axle oil pool (24) through pipelines, respectively; the outlet of the oil suction diverter valve (5) is connected to the inlet of the gear pump (11) through a pipeline; the outlet of the gear pump (11) is divided into two paths, one path is connected to the clutch piston (18) through pipelines of the micro valve (13) and the shift valve (14) in sequence, and the other path is connected to the inlet of the torque converter (16) through pipelines of the main overflow valve (12) and the torque conversion inlet valve (15) in sequence; The outlet of the torque converter (16) is connected to the inlet of the oil return diverter valve (4) through a radiator (3) pipeline. The outlet of the oil return diverter valve (4) is divided into two paths. One path is connected to the top inlet of the housing cavity of the drive axle (2) through a pipeline. The other path is connected to the top inlet of the housing cavity of the clutch through a pipeline. The housing cavity outlet of the clutch is connected to the top inlet of the housing cavity of the drive axle (2) through a pipeline. The lubrication and cooling system further comprises an oil level balance pipe (6), one end of the oil level balance pipe (6) being connected to the transmission oil pool (17), and the other end of the oil level balance pipe (6) being connected to the drive axle oil pool (24), and the oil level balance pipe (6) being located below the lowest oil level of the transmission oil pool (17) and the drive axle oil pool (24); The oil return diverter valve (4) comprises an oil return valve body (41), a cylindrical valve core (42) and a mounting plate (45); an oil inlet pipe (48) is arranged vertically on one side of the oil return valve body (41); an upper oil outlet pipe (43) and a lower oil outlet pipe (431) are arranged vertically on adjacent sides in parallel; and an oil inlet of the upper oil outlet pipe (43) and an oil inlet of the lower oil outlet pipe (431) are respectively connected to the oil inlet pipe (48) in the oil return valve body (41); The valve core (42) is vertically inserted into the oil return valve body (41), and is sealed in the oil return valve body (41) via a sealing plug (44); The valve core (42) vertically penetrates the upper oil outlet pipe (43) and the lower oil outlet pipe (431) in sequence. An upper annular groove and a lower annular groove are respectively formed on the outer cylindrical surface of the valve core (42) corresponding to the upper oil outlet pipe (43) and the lower oil outlet pipe (431), so that the diameter of the valve core (42) corresponding to the upper annular groove is smaller than the diameter of the upper oil outlet pipe (43), and the diameter of the valve core (42) corresponding to the lower annular groove is smaller than the diameter of the lower oil outlet pipe (431). The oil output of the upper oil outlet pipe (43) and the lower oil outlet pipe (431) can be adjusted by adjusting the height of the valve core (42); When the system is in operation, the hydraulic oil in the transmission oil pool (17) and the drive axle oil pool (24) is regulated in flow by the oil suction diverter valve (5), one path of the hydraulic oil enters the clutch piston, and the other path is cooled by the radiator (3) to obtain cooling oil; the cooling oil is regulated in flow by the oil return diverter valve (4), one path of the hydraulic oil returns to the drive axle oil pool (24) through the shell cavity of the drive axle (2), and the other path first enters the shell cavity of the clutch, and then returns to the transmission oil pool (17) through the shell cavity of the drive axle (2).

2. A lubrication and cooling system for a hydraulic transmission axle of a forklift according to claim 1, characterized in that: The height of the upper annular groove is greater than the diameter of the upper oil outlet pipe (43), and the height of the lower annular groove is greater than the diameter of the lower oil outlet pipe (431); The upper end and the lower end of the valve core (42) are each provided with more than three adjustment gaskets (46), and the height of the valve core (42) is adjusted by increasing or decreasing the number of the adjustment gaskets (46) at the upper end and the lower end of the valve core (42), thereby changing the oil output of the upper oil outlet pipe (43) and the lower oil outlet pipe (431).

3. The lubrication and cooling system for a hydraulic transmission axle of a forklift according to claim 1, characterized in that: The sector plate (25) of the drive axle (2) is fixedly connected to the forklift frame by means of a large bolt (8) and a hexagonal nut (81) with a flange surface; One end of the mounting plate (45) is locked and fixed by bolts and the oil return valve body (41), and the other end of the mounting plate (45) is sleeved outside the hexagonal nut (81), and a fixing plate (410) with a hexagonal inner hole is sleeved outside the hexagonal nut (81) and locked by the fastening nut (49) and the large bolt (8) stud, so that the mounting plate (45) and the sector plate (25) are fixedly connected; a clamping fixing plate (47) is provided on the corresponding large bolt (8) stud between the mounting plate (45) and the fastening nut (49).

4. The lubrication and cooling system for a hydraulic transmission axle of a forklift according to claim 1, characterized in that: The oil suction diverter valve (5) comprises a diverter valve body, and a drive axle oil inlet pipe (51), a gearbox oil inlet pipe (54) and an oil outlet pipe (53) are respectively arranged vertically on three adjacent side surfaces of the diverter valve body; The oil outlet of the drive axle oil inlet pipe (51) and the oil outlet of the gearbox oil inlet pipe (54) are respectively connected to the oil inlet of the oil outlet pipe (53) in the diverter valve body, and a first annular throttling plug (52) is provided in the drive axle oil inlet pipe (51), and a second annular throttling plug (55) is provided in the gearbox oil inlet pipe (54).

5. The lubrication and cooling system for a hydraulic transmission axle of a forklift according to claim 1, characterized in that: The oil outlet of the drive axle oil pool (24) and the oil outlet of the gearbox oil pool (17) are respectively provided with an oil suction filter (7).

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