Hydraulic oil level control system and method for high-horsepower tractor and high-horsepower tractor

Abstract

The invention provides a hydraulic oil level control system and method for a high-horsepower tractor and the high-horsepower tractor. A hydraulic oil level control system for a high-horsepower tractor comprises a tractor chassis, a chassis liquid level control air suction pipe, a hydraulic oil level control valve, an air pump air inlet pipe, an air pump, an air pump exhaust pipe, an auxiliary hydraulic oil tank and a chassis oil and auxiliary hydraulic oil tank communicating oil pipe. The hydraulic oil level control valve is connected with the chassis liquid level control air suction pipe and the auxiliary hydraulic oil tank, the air pump is connected with the hydraulic oil level control valve through the air pump air inlet pipe, and the air pump exhaust pipe is connected with the air pump. The bottom of the tractor chassis is connected with the bottom of the auxiliary hydraulic oil tank through the chassis oil and auxiliary hydraulic oil tank communicating oil pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems for large-horsepower tractors, and particularly to a hydraulic oil level control system, a method, and a large-horsepower tractor for large-horsepower tractors. Background Art

[0002] With the upgrade of tractor horsepower, tractors have more and more working conditions for outputting hydraulic oil to attachments (such as large trailers with tipping buckets), and the amount of hydraulic oil output is increasing. In order to prevent the tractor from being sucked empty, the tractor can only increase the amount of hydraulic oil. The increase in the amount of oil greatly increases the oil agitation loss during transmission, resulting in an increase in power consumption and an increase in usage costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a hydraulic oil level control system, a method, and a large-horsepower tractor for large-horsepower tractors in view of the deficiencies of the prior art.

[0004] The technical solution of the present invention to solve the above technical problem is as follows: A hydraulic oil level control system for a large-horsepower tractor includes: a tractor chassis, a chassis liquid level control suction pipe, a hydraulic oil level control valve, an air pump intake pipe, an air pump, an air pump exhaust pipe, a secondary hydraulic oil tank, and a chassis oil and secondary hydraulic oil tank connecting pipe. The chassis liquid level control suction pipe is connected to the bottom of the tractor chassis. The hydraulic oil level control valve is respectively connected to the chassis liquid level control suction pipe and the secondary hydraulic oil tank. The air pump is connected to the hydraulic oil level control valve through the air pump intake pipe. The air pump exhaust pipe is connected to the air pump. The bottom of the tractor chassis is connected to the bottom of the secondary hydraulic oil tank through the chassis oil and secondary hydraulic oil tank connecting pipe.

[0005] The beneficial effect of adopting the technical solution of the present invention is: It solves the power consumption loss caused when increasing the amount of hydraulic oil. It can increase the amount of hydraulic oil while maintaining the normal oil level, and there will be no oil agitation loss during transmission, reducing the usage cost. It can output a large flow of hydraulic oil externally.

[0006] Further, the hydraulic oil level control valve includes: a two-position three-way directional valve and a secondary hydraulic oil tank suction pipe. The two-position three-way directional valve is respectively connected to the air pump intake pipe and the chassis liquid level control suction pipe. One end of the secondary hydraulic oil tank suction pipe is connected to the top of the secondary hydraulic oil tank, and the other end of the secondary hydraulic oil tank suction pipe is connected to the chassis liquid level control suction pipe.

[0007] The beneficial effects of adopting the above further technical solution are as follows: When the whole machine starts the vehicle, the air pump works at this time. The gas in the auxiliary hydraulic oil tank is discharged into the atmosphere through the suction pipe of the auxiliary hydraulic oil tank, the two-way three-way directional valve, the air pump intake pipe, the air pump and the air pump exhaust pipe. At this time, the pressure in the auxiliary hydraulic oil tank becomes smaller. Therefore, the hydraulic oil in the tractor chassis flows into the auxiliary hydraulic oil tank through the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank until it reaches the second chassis oil level. At this time, the chassis level control suction pipe is connected to the chassis oil breather port, and the gas pressure reaches equilibrium. The liquid level in the tractor chassis is balanced at the second chassis oil level, and the liquid level in the auxiliary hydraulic oil tank is balanced at the first auxiliary hydraulic oil level. In this state, the liquid level in the tractor chassis decreases, the transmission stirring oil loss becomes smaller, and the excess hydraulic oil is stored in the auxiliary hydraulic oil tank. When the tractor outputs a large flow from the tractor chassis, due to atmospheric pressure, the liquid level of the second chassis oil level remains unchanged. At this time, the liquid level of the first auxiliary hydraulic oil tank decreases, and the decreasing height depends on the magnitude of the external output. The maximum output volume is exactly the volume of the auxiliary hydraulic oil tank.

[0008] Further, a check valve and a floating control handle are installed in the hydraulic oil level control valve. The two-way three-way directional valve is connected with an overflow protection suction pipe. The overflow protection suction pipe is connected to the top of the tractor chassis. Two ends of the check valve are respectively connected with the overflow protection suction pipe and the air pump intake pipe. The floating control handle is connected with the two-way three-way directional valve. The floating control handle is located at the top of the auxiliary hydraulic oil tank.

[0009] The beneficial effects of adopting the above further technical solution are as follows: When too much hydraulic oil is filled in the tractor chassis, when the whole machine starts the vehicle at this time, because the third chassis oil level is still higher than the suction port position of the chassis level control suction pipe, the chassis level control suction pipe is in a closed state, and the liquid level in the auxiliary hydraulic oil tank will keep rising until it reaches the position of the third auxiliary hydraulic oil level. At this time, the floating control handle touches to reverse the two-way three-way directional valve. The gas flow direction is that it is discharged into the atmosphere through the overflow protection suction pipe, the hydraulic oil level control valve, the air pump intake pipe, the air pump and the air pump exhaust pipe. Finally, the tractor chassis is at the third chassis oil level, and the auxiliary hydraulic oil tank is at the third auxiliary hydraulic oil level. When the liquid level is relatively low, there is a phenomenon that the oil in the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank is not exchanged in time. At this time, the check valve opens and is discharged into the atmosphere through the overflow protection suction pipe, the check valve, the air pump intake pipe, the air pump and the air pump exhaust pipe.

[0010] Further, the floating control handle includes a float and a connecting rod. The connecting rod is connected with the two-way three-way directional valve. The float is installed at the free end of the connecting rod. The float is located at the top of the auxiliary hydraulic oil tank.

[0011] The beneficial effects of adopting the above further technical solution are as follows: The setting of the float facilitates the hydraulic oil in the auxiliary hydraulic oil tank to touch the floating control handle to reverse the two-way three-way directional valve. The structure is simple, which is convenient for installation and maintenance.

[0012] Furthermore, a chassis oil filling port and a chassis oil breather port are installed at the top of the tractor chassis.

[0013] The beneficial effects of adopting the above further technical solution are as follows: The setting of the chassis oil filling port facilitates injecting hydraulic oil into the tractor chassis. The setting of the chassis oil breather port facilitates the chassis liquid level control suction pipe to communicate with the chassis oil breather port, so that the gas pressure reaches equilibrium, the liquid level in the tractor chassis is balanced at the second chassis oil liquid level, and the liquid level in the auxiliary hydraulic oil tank is balanced at the first auxiliary hydraulic oil tank liquid level.

[0014] Furthermore, hydraulic oil is provided in both the tractor chassis and the auxiliary hydraulic oil tank.

[0015] The beneficial effects of adopting the above further technical solution are as follows: The excess hydraulic oil is stored in the auxiliary hydraulic oil tank. When the tractor outputs a large flow rate from the tractor chassis, due to atmospheric pressure, the liquid level of the second chassis oil liquid level remains unchanged. At this time, the liquid level of the first auxiliary hydraulic oil tank decreases, and the decreasing height depends on the magnitude of the external output. The maximum output volume is exactly the volume of the auxiliary hydraulic oil tank 8. Adding an auxiliary oil tank increases the hydraulic oil output volume of the tractor for attachments. Reduces the churning loss of the transmission. Solves the demand for large flow rate output of the tractor for attachments. Solves the waste of churning loss of the transmission.

[0016] Furthermore, the top end of the tractor chassis is flush with the top end of the auxiliary hydraulic oil tank, the bottom end of the auxiliary hydraulic oil tank is higher than the bottom end of the tractor chassis, and the tractor chassis and the auxiliary hydraulic oil tank are arranged adjacent to each other.

[0017] The beneficial effects of adopting the above further technical solution are as follows: It is convenient to realize storing the excess hydraulic oil in the auxiliary hydraulic oil tank. When the tractor outputs a large flow rate from the tractor chassis, due to atmospheric pressure, the liquid level of the second chassis oil liquid level remains unchanged. At this time, the liquid level of the first auxiliary hydraulic oil tank decreases, and the decreasing height depends on the magnitude of the external output. The maximum output volume is exactly the volume of the auxiliary hydraulic oil tank.

[0018] In addition, the present invention also provides a large-horsepower tractor, including the hydraulic oil level control system for a large-horsepower tractor described in any one of the above.

[0019] The beneficial effects of adopting the technical solution of the present invention are as follows: It solves the power consumption loss caused when increasing the amount of hydraulic oil. It can increase the amount of hydraulic oil while maintaining the normal oil level, and there will be no churning loss of the transmission, reducing the use cost. It can output a large flow rate of hydraulic oil.

[0020] In addition, the present invention also provides a hydraulic oil level control method for a large-horsepower tractor. Based on the hydraulic oil level control system for a large-horsepower tractor described in any one of the above, the hydraulic oil level control method for a large-horsepower tractor includes: in a static state, the hydraulic oil in the tractor chassis is at the first chassis oil liquid level, and the hydraulic oil in the auxiliary hydraulic oil tank is at the second auxiliary hydraulic oil tank liquid level. The first chassis oil liquid level and the second auxiliary hydraulic oil tank liquid level are at the same liquid level height due to the principle of atmospheric pressure; when the vehicle is started, the air pump is started, and the gas in the auxiliary hydraulic oil tank is discharged into the atmosphere through the hydraulic oil level control valve, the air pump intake pipe, the air pump, and the air pump exhaust pipe; this makes the pressure in the auxiliary hydraulic oil tank smaller, and the hydraulic oil in the tractor chassis flows through the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank into the auxiliary hydraulic oil tank until it reaches the second chassis oil liquid level. At this time, the chassis liquid level control suction pipe is connected to the chassis oil breather port, and the gas pressure reaches equilibrium. The liquid level in the tractor chassis is balanced at the second chassis oil liquid level, and the liquid level in the auxiliary hydraulic oil tank is balanced at the first auxiliary hydraulic oil tank liquid level.

[0021] The beneficial effects of adopting the technical solution of the present invention are: when the tractor outputs a large flow rate from the tractor chassis, due to atmospheric pressure, the liquid level of the second chassis oil liquid level remains unchanged. At this time, the liquid level of the first auxiliary hydraulic oil tank decreases, and the decreasing height depends on the magnitude of the external output. The maximum volume that can be output is exactly the volume of the auxiliary hydraulic oil tank. This solves the power consumption loss caused by increasing the amount of hydraulic oil. It can increase the amount of hydraulic oil while maintaining the normal oil level, and there will be no transmission churning oil loss, reducing the usage cost. It can output a large flow rate of hydraulic oil externally.

[0022] Furthermore, it also includes: when the hydraulic oil filled in the tractor chassis is excessive, and when the vehicle is started, because the third chassis oil liquid level is still higher than the suction port position of the chassis liquid level control suction pipe, the chassis liquid level control suction pipe is in a closed state, and the liquid level in the auxiliary hydraulic oil tank will keep rising until it reaches the third auxiliary hydraulic oil tank liquid level position. At this time, the floating control handle touches the two-position three-way directional control valve, so that the gas is discharged into the atmosphere through the overflow protection suction pipe, the hydraulic oil level control valve, the air pump intake pipe, the air pump, and the air pump exhaust pipe. Finally, the tractor chassis is at the third chassis oil liquid level, and the auxiliary hydraulic oil tank is at the third auxiliary hydraulic oil tank liquid level; when the liquid level is relatively low, there is a phenomenon that the oil liquid in the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank does not exchange positions in time. At this time, the one-way valve opens, so that the gas is discharged into the atmosphere through the overflow protection suction pipe, the one-way valve, the air pump intake pipe, the air pump, and the air pump exhaust pipe.

[0023] The beneficial effects of adopting the above further technical solution are: it is convenient to realize the adaptive adjustment of excessive hydraulic oil and relatively low liquid level, improving adaptability.

[0024] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through practice of the present invention. Brief Description of the Drawings

[0025] Figure 1 One of the schematic structural diagrams of the hydraulic oil level control system for a large - horsepower tractor provided by an embodiment of the present invention.

[0026] Figure 2 Another schematic structural diagram of the hydraulic oil level control system for a large - horsepower tractor provided by an embodiment of the present invention.

[0027] Figure 3 Another schematic structural diagram of the hydraulic oil level control system for a large - horsepower tractor provided by an embodiment of the present invention.

[0028] Explanation of the reference numerals in the drawings: 1. Tractor chassis; 1a. First chassis oil liquid level; 1b. Second chassis oil liquid level; 1c. Third chassis oil liquid level; 2. Chassis liquid level control suction pipe; 3. Overflow protection suction pipe; 4. Hydraulic oil level control valve; 4a. Check valve; 4b. Two - position three - way reversing valve; 4c. Floating control handle; 4d. Sub - hydraulic oil tank suction pipe; 5. Air pump intake pipe; 6. Air pump; 7. Air pump exhaust pipe; 8. Sub - hydraulic oil tank; 8a. First sub - hydraulic oil tank liquid level; 8b. Second sub - hydraulic oil tank liquid level; 8c. Third sub - hydraulic oil tank liquid level; 9. Connecting pipe between chassis oil and sub - hydraulic oil tank; 10. Chassis oil filling port; 11. Chassis oil breather port. Detailed Embodiment

[0029] The principles and features of the present invention will be described below with reference to the drawings. The illustrated embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0030] As Figure 1 shown, an embodiment of the present invention provides a hydraulic oil level control system for a large - horsepower tractor, including: tractor chassis 1, chassis liquid level control suction pipe 2, hydraulic oil level control valve 4, air pump intake pipe 5, air pump 6, air pump exhaust pipe 7, sub - hydraulic oil tank 8, and connecting pipe 9 between chassis oil and sub - hydraulic oil tank. The chassis liquid level control suction pipe 2 is connected to the bottom of the tractor chassis 1. The hydraulic oil level control valve 4 is respectively connected to the chassis liquid level control suction pipe 2 and the sub - hydraulic oil tank 8. The air pump 6 is connected to the hydraulic oil level control valve 4 through the air pump intake pipe 5. The air pump exhaust pipe 7 is connected to the air pump 6. The bottom of the tractor chassis 1 is connected to the bottom of the sub - hydraulic oil tank 8 through the connecting pipe 9 between chassis oil and sub - hydraulic oil tank.

[0031] The beneficial effects of adopting the technical solution of the present invention are as follows: It solves the power consumption loss caused by increasing the amount of hydraulic oil. When the hydraulic oil level is normal, the amount of hydraulic oil can be increased without transmission oil stirring loss, thus reducing the use cost. It can output a large flow of hydraulic pressure externally.

[0032] 1. It solves the power consumption loss caused by increasing the amount of hydraulic oil.

[0033] 2. When the hydraulic oil level is normal, the amount of hydraulic oil can be increased without transmission oil stirring loss, thus reducing the use cost.

[0034] 3. It can output a large flow of hydraulic pressure externally.

[0035] As Figure 1 shown, further, the hydraulic oil level control valve 4 includes: a two-position three-way directional control valve 4b and a sub-hydraulic oil tank suction pipe 4d. The two-position three-way directional control valve 4b is respectively connected to the air pump inlet pipe 5 and the chassis liquid level control suction pipe 2. One end of the sub-hydraulic oil tank suction pipe 4d is connected to the top of the sub-hydraulic oil tank 8, and the other end of the sub-hydraulic oil tank suction pipe 4d is connected to the chassis liquid level control suction pipe 2.

[0036] The beneficial effects of adopting the above further technical solution are as follows: After the vehicle is started, the air pump works. The gas in the sub-hydraulic oil tank is discharged into the atmosphere through the sub-hydraulic oil tank suction pipe, two-position three-way directional control valve, air pump inlet pipe, air pump and air pump exhaust pipe. At this time, the pressure in the sub-hydraulic oil tank becomes smaller. Therefore, the hydraulic oil in the tractor chassis flows into the sub-hydraulic oil tank through the connecting pipe between the chassis oil and the sub-hydraulic oil tank until it reaches the second chassis oil level. At this time, the chassis liquid level control suction pipe is connected to the chassis oil breather port, and the gas pressure reaches equilibrium. The liquid level in the tractor chassis is balanced at the second chassis oil level, and the liquid level in the sub-hydraulic oil tank is balanced at the first sub-hydraulic oil tank level. In this state, the liquid level in the tractor chassis decreases, the transmission oil stirring loss becomes smaller, and the excess hydraulic oil is stored in the sub-hydraulic oil tank. When the tractor outputs a large flow externally from the tractor chassis, due to atmospheric pressure, the liquid level of the second chassis oil level remains unchanged. At this time, the liquid level of the first sub-hydraulic oil tank decreases, and the decreasing height depends on the magnitude of the external output. The maximum volume that can be output is exactly the volume of the sub-hydraulic oil tank.

[0037] As Figure 1As shown in the figure, further, a check valve 4a and a floating control handle 4c are installed in the hydraulic oil level control valve 4. The two-position three-way directional control valve 4b is connected to an overflow protection air suction pipe 3. The overflow protection air suction pipe 3 is connected to the top of the tractor chassis 1. Two ends of the check valve 4a are respectively connected to the overflow protection air suction pipe 3 and the air pump intake pipe 5. The floating control handle 4c is connected to the two-position three-way directional control valve 4b. The floating control handle 4c is located on the top of the auxiliary hydraulic oil tank 8.

[0038] The beneficial effects of adopting the above further technical solution are as follows: When too much hydraulic oil is filled in the tractor chassis, when the vehicle is started after the whole machine is started, because the third chassis oil liquid level is still higher than the suction port position of the chassis liquid level control air suction pipe, the chassis liquid level control air suction pipe is in a closed state, and the liquid level in the auxiliary hydraulic oil tank will keep rising until it reaches the third auxiliary hydraulic oil tank liquid level position. At this time, the floating control handle touches and reverses the two-position three-way directional control valve. The gas flow direction is the overflow protection air suction pipe, the hydraulic oil level control valve, the air pump intake pipe, the air pump and the air pump exhaust pipe to be discharged into the atmosphere. Finally, the tractor chassis is at the third chassis oil liquid level, and the auxiliary hydraulic oil tank is at the third auxiliary hydraulic oil tank liquid level. When the liquid level is relatively low, there is a phenomenon that the oil liquid exchange position in the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank is not timely. At this time, the check valve opens, and the overflow protection air suction pipe, the check valve, the air pump intake pipe, the air pump and the air pump exhaust pipe are discharged into the atmosphere.

[0039] As Figure 1 As shown in the figure, further, the floating control handle 4c includes a float and a connecting rod. The connecting rod is connected to the two-position three-way directional control valve 4b. The float is installed at the free end of the connecting rod. The float is located on the top of the auxiliary hydraulic oil tank 8.

[0040] The beneficial effects of adopting the above further technical solution are as follows: The setting of the float facilitates the hydraulic oil in the auxiliary hydraulic oil tank to touch the floating control handle and reverse the two-position three-way directional control valve. The structure is simple and convenient for installation and maintenance.

[0041] As Figure 1 As shown in the figure, further, a chassis oil filling port 10 and a chassis oil breather port 11 are installed on the top of the tractor chassis 1.

[0042] The beneficial effects of adopting the above further technical solution are as follows: The setting of the chassis oil filling port facilitates injecting hydraulic oil into the tractor chassis. The setting of the chassis oil breather port facilitates the chassis liquid level control air suction pipe to communicate with the chassis oil breather port, so that the gas pressure reaches balance. The liquid level in the tractor chassis is balanced at the second chassis oil liquid level, and the liquid level in the auxiliary hydraulic oil tank is balanced at the first auxiliary hydraulic oil tank liquid level.

[0043] As Figure 1As shown, further, hydraulic oil is provided in both the tractor chassis 1 and the auxiliary hydraulic oil tank 8.

[0044] The beneficial effects of adopting the above further technical solution are as follows: The excess hydraulic oil is stored in the auxiliary hydraulic oil tank. When the tractor outputs a large flow rate from the tractor chassis, due to atmospheric pressure, the liquid level of the second chassis oil level remains unchanged. At this time, the liquid level of the first auxiliary hydraulic oil tank decreases, and the decreasing height depends on the magnitude of the externally output quantity. The maximum output volume is exactly the volume of the auxiliary hydraulic oil tank 8. Adding an auxiliary oil tank increases the hydraulic oil output volume of the tractor for attachments. It reduces the churning loss of the transmission. It solves the demand for large flow rate output of the tractor for attachments. It solves the waste of churning loss of the transmission.

[0045] As Figure 1 shown, further, the top end of the tractor chassis 1 is flush with the top end of the auxiliary hydraulic oil tank 8, the bottom end of the auxiliary hydraulic oil tank 8 is higher than the bottom end of the tractor chassis 1, and the tractor chassis 1 and the auxiliary hydraulic oil tank 8 are arranged adjacent to each other.

[0046] The beneficial effects of adopting the above further technical solution are as follows: It is convenient to store the excess hydraulic oil in the auxiliary hydraulic oil tank. When the tractor outputs a large flow rate from the tractor chassis, due to atmospheric pressure, the liquid level of the second chassis oil level remains unchanged. At this time, the liquid level of the first auxiliary hydraulic oil tank decreases, and the decreasing height depends on the magnitude of the externally output quantity. The maximum output volume is exactly the volume of the auxiliary hydraulic oil tank.

[0047] In addition, the present invention also provides a large - horsepower tractor, including the hydraulic oil level control system for a large - horsepower tractor described in any one of the above.

[0048] The beneficial effects of adopting the technical solution of the present invention are as follows: It solves the power consumption loss caused when increasing the amount of hydraulic oil. It can increase the amount of hydraulic oil while maintaining the normal oil level, and there will be no churning loss of the transmission, reducing the use cost. It can output a large flow rate of hydraulic oil externally.

[0049] In addition, the present invention also provides a hydraulic oil level control method for a large-horsepower tractor. Based on the hydraulic oil level control system for a large-horsepower tractor described in any one of the above, the hydraulic oil level control method for a large-horsepower tractor includes: In a static state, the hydraulic oil in the tractor chassis is at the first chassis oil liquid level, and the hydraulic oil in the auxiliary hydraulic oil tank is at the second auxiliary hydraulic oil tank liquid level. The first chassis oil liquid level and the second auxiliary hydraulic oil tank liquid level are at the same liquid level height due to the atmospheric pressure principle; when the vehicle is started, the air pump is started, and the gas in the auxiliary hydraulic oil tank is discharged into the atmosphere through the hydraulic oil level control valve, the air pump intake pipe, the air pump, and the air pump exhaust pipe; this makes the pressure in the auxiliary hydraulic oil tank smaller, and the hydraulic oil in the tractor chassis flows through the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank into the auxiliary hydraulic oil tank until it reaches the second chassis oil liquid level. At this time, the chassis liquid level control suction pipe is connected to the chassis oil breather port, and the gas pressure reaches equilibrium. The liquid level in the tractor chassis is balanced at the second chassis oil liquid level, and the liquid level in the auxiliary hydraulic oil tank is balanced at the first auxiliary hydraulic oil tank liquid level.

[0050] The beneficial effects of adopting the technical solution of the present invention are: When the tractor outputs a large flow rate from the tractor chassis, due to the atmospheric pressure, the liquid level of the second chassis oil liquid level remains unchanged. At this time, the liquid level of the first auxiliary hydraulic oil tank decreases, and the decreasing height depends on the magnitude of the external output. The maximum volume that can be output is exactly the volume of the auxiliary hydraulic oil tank. This solves the power consumption loss caused by increasing the amount of hydraulic oil. It is possible to increase the amount of hydraulic oil while maintaining the normal oil level, and there will be no transmission churning oil loss, reducing the usage cost. It can output a large flow rate of hydraulic oil externally.

[0051] Furthermore, it also includes: When the hydraulic oil filled in the tractor chassis is excessive, and when the vehicle is started, because the third chassis oil liquid level is still higher than the suction port position of the chassis liquid level control suction pipe, the chassis liquid level control suction pipe is in a closed state, and the liquid level in the auxiliary hydraulic oil tank will keep rising until it reaches the third auxiliary hydraulic oil tank liquid level position. At this time, the floating control handle touches the two-position three-way directional control valve, so that the gas is discharged into the atmosphere through the overflow protection suction pipe, the hydraulic oil level control valve, the air pump intake pipe, the air pump, and the air pump exhaust pipe. Finally, the tractor chassis is at the third chassis oil liquid level, and the auxiliary hydraulic oil tank is at the third auxiliary hydraulic oil tank liquid level; when the liquid level is relatively low, there is a phenomenon that the oil in the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank is not exchanged in time. At this time, the check valve opens, so that the gas is discharged into the atmosphere through the overflow protection suction pipe, the check valve, the air pump intake pipe, the air pump, and the air pump exhaust pipe.

[0052] The beneficial effects of adopting the above further technical solution are: It is convenient to realize the adaptive adjustment for excessive hydraulic oil and relatively low liquid level, improving the adaptability.

[0053] In a static state, such as Figure 1, the tractor is filled with chassis oil (hydraulic oil in the tractor chassis) up to the first chassis oil level 1a. At this time, the first chassis oil level 1a and the second auxiliary hydraulic oil tank level 8b are at the same liquid level height due to the principle of atmospheric pressure.

[0054] After the vehicle is started, as Figure 2 , at this time, the air pump 6 works, and the gas in the auxiliary hydraulic oil tank 8 is discharged to the atmosphere through the auxiliary hydraulic oil tank suction pipe 4d - two-way three-way directional valve 4b - air pump intake pipe 5 - air pump 6 - air pump exhaust pipe 7. At this time, the pressure in the auxiliary hydraulic oil tank 8 becomes smaller. Therefore, the hydraulic oil in the tractor chassis 1 flows into the auxiliary hydraulic oil tank 8 through the connecting pipe 9 between the chassis oil and the auxiliary hydraulic oil tank until it reaches the second chassis oil level 1b. At this time, the chassis liquid level control suction pipe 2 is connected to the chassis oil breather port 11, and the gas pressure reaches equilibrium. The liquid level in the tractor chassis 1 is balanced at the second chassis oil level 1b, and the liquid level in the auxiliary hydraulic oil tank 8 is balanced at the first auxiliary hydraulic oil tank level 8a. In this state, the liquid level in the tractor chassis 1 decreases, the transmission stirring oil loss becomes smaller, and the excess hydraulic oil is stored in the auxiliary hydraulic oil tank 8. When the tractor outputs a large flow from the tractor chassis 1, due to the reason of atmospheric pressure, the liquid level of the second chassis oil level 1b remains unchanged. At this time, the first auxiliary hydraulic oil tank level 8a decreases, and the decreasing height depends on the magnitude of the external output. The maximum volume that can be output is exactly the volume of the auxiliary hydraulic oil tank 8.

[0055] When too much hydraulic oil is filled in the tractor chassis 1, as Figure 3 , after the vehicle is started, because the third chassis oil level 1c is still higher than the suction port position of the chassis liquid level control suction pipe 2, the chassis liquid level control suction pipe 2 is in the closed state, and the liquid level in the auxiliary hydraulic oil tank 8 will keep rising until it reaches the third auxiliary hydraulic oil tank level 8c. At this time, the floating control handle 4c touches and reverses the two-way three-way directional valve 4b, and the gas flow direction is the overflow protection suction pipe 3 - hydraulic oil level control valve 4 - air pump intake pipe 5 - air pump 6 - air pump exhaust pipe 7 and is discharged to the atmosphere. Finally, the tractor chassis 1 is at the third chassis oil level 1c, and the auxiliary hydraulic oil tank 8 is at the third auxiliary hydraulic oil tank level 8c.

[0056] When the liquid level is relatively low, there is a phenomenon that the oil in the connecting pipe 9 between the chassis oil and the auxiliary hydraulic oil tank does not exchange positions in time. At this time, the check valve 4a opens, and the gas is discharged to the atmosphere through the overflow protection suction pipe 3 - check valve 4a - air pump intake pipe 5 - air pump 6 - air pump exhaust pipe 7.

[0057] Among them, Figure 2 and Figure 3 the arrows in represent the flow direction and flow path of the gas.

[0058] 1. Add an auxiliary fuel tank to the hydraulic oil level control system. 2. Reduce the oil agitation loss of the transmission. 3. Increase the hydraulic oil output volume of the tractor for implements. Solve the demand for large-flow output of the tractor for implements. Solve the waste of oil agitation loss in the transmission.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic oil level control system for a high-horsepower tractor, characterized in that: include: A tractor chassis (1), a chassis liquid level control air intake pipe (2), a hydraulic oil level control valve (4), an air pump air intake pipe (5), an air pump (6), an air pump exhaust pipe (7), an auxiliary hydraulic oil tank (8), and an oil pipe (9) connecting chassis oil and the auxiliary hydraulic oil tank. The chassis liquid level control air intake pipe (2) is connected to the bottom of the tractor chassis (1). The hydraulic oil level control valve (4) is connected to the chassis liquid level control air intake pipe (2) and the auxiliary hydraulic oil tank (8), respectively. The air pump (6) is connected to the hydraulic oil level control valve (4) via the air pump air intake pipe (5). The air pump exhaust pipe (7) is connected to the air pump (6). The bottom of the tractor chassis (1) is connected to the bottom of the auxiliary hydraulic oil tank (8) via the oil pipe (9) connecting chassis oil and the auxiliary hydraulic oil tank.

2. A hydraulic oil level control system for a high-horsepower tractor according to claim 1, characterized in that: The hydraulic oil level control valve (4) comprises: a two-position three-way reversing valve (4b) and an auxiliary hydraulic oil tank suction pipe (4d); the two-position three-way reversing valve (4b) is connected to the air pump intake pipe (5) and the chassis liquid level control suction pipe (2) respectively; one end of the auxiliary hydraulic oil tank suction pipe (4d) is connected to the top of the auxiliary hydraulic oil tank (8); and the other end of the auxiliary hydraulic oil tank suction pipe (4d) is connected to the chassis liquid level control suction pipe (2).

3. A hydraulic oil level control system for a high-horsepower tractor according to claim 2, characterized in that: A one-way valve (4a) and a floating control handle (4c) are installed in the hydraulic oil level control valve (4); the two-position three-way reversing valve (4b) is connected to an overflow protection suction pipe (3); the overflow protection suction pipe (3) is connected to the top of the tractor chassis (1); two ends of the one-way valve (4a) are respectively connected to the overflow protection suction pipe (3) and the air pump intake pipe (5); the floating control handle (4c) is connected to the two-position three-way reversing valve (4b); and the floating control handle (4c) is located on the top of the auxiliary hydraulic oil tank (8).

4. A hydraulic oil level control system for a high-horsepower tractor according to claim 3, characterized in that: The floating control handle (4c) comprises a float and a connecting rod, the connecting rod is connected to the two-position three-way reversing valve (4b), the float is installed at the free end of the connecting rod, and the float is located on the top of the auxiliary hydraulic oil tank (8).

5. The hydraulic oil level control system for a high-horsepower tractor according to claim 1, characterized in that: A chassis oil filling port (10) and a chassis oil breathing port (11) are installed on the top of the tractor chassis (1).

6. The hydraulic oil level control system for a high-horsepower tractor according to claim 1, characterized in that: Hydraulic oil is provided in the tractor chassis (1) and the auxiliary hydraulic oil tank (8).

7. The hydraulic oil level control system for a high-horsepower tractor according to claim 1, characterized in that: The top end of the tractor chassis (1) is flush with the top end of the auxiliary hydraulic oil tank (8), the bottom end of the auxiliary hydraulic oil tank (8) is higher than the bottom end of the tractor chassis (1), and the tractor chassis (1) and the auxiliary hydraulic oil tank (8) are arranged adjacent to each other.

8. A high-horsepower tractor, characterized in that: A hydraulic oil level control system for a high-horsepower tractor comprising the above-mentioned any one of claims 1 to 7.

9. A method for controlling the hydraulic oil level of a high-horsepower tractor, characterized in that: Based on a hydraulic oil level control system for a high-horsepower tractor according to any one of claims 1 to 7 above, a hydraulic oil level control method for a high-horsepower tractor comprises: In a static state, the hydraulic oil in the tractor chassis is at a first chassis oil level, the hydraulic oil in the auxiliary hydraulic oil tank is at a second auxiliary hydraulic oil tank level, and the first chassis oil level and the second auxiliary hydraulic oil tank level are at the same level due to the atmospheric pressure principle; When the vehicle is started, the air pump is started to discharge the gas in the auxiliary hydraulic oil tank into the atmosphere through the hydraulic oil level control valve, the air pump intake pipe, the air pump and the air pump exhaust pipe; the pressure in the auxiliary hydraulic oil tank becomes smaller, and the hydraulic oil in the tractor chassis flows to the auxiliary hydraulic oil tank through the oil pipe connecting the chassis oil and the auxiliary hydraulic oil tank until the second chassis oil level is reached. At this time, the chassis level control air intake pipe is connected to the chassis oil breathing port, the gas pressure is balanced, the liquid level in the tractor chassis is balanced at the second chassis oil level, and the liquid level in the auxiliary hydraulic oil tank is balanced at the first auxiliary hydraulic oil tank level.

10. The method for controlling the hydraulic oil level for a high-horsepower tractor according to claim 9, characterized in that: Also includes: When the tractor chassis is filled with too much hydraulic oil, and after the vehicle is started, because the third chassis oil level is still higher than the air inlet position of the chassis level control air intake pipe, the chassis level control air intake pipe is in a closed state, and the liquid level in the auxiliary hydraulic oil tank will continue to rise until it reaches the third auxiliary hydraulic oil tank level position. At this time, the floating control handle is touched to switch the two-position three-way reversing valve, so that the gas is discharged into the atmosphere through the overflow protection air intake pipe, the hydraulic oil level control valve, the air pump intake pipe, the air pump and the air pump exhaust pipe. Finally, the tractor chassis is at the third chassis oil level, and the auxiliary hydraulic oil tank is at the third auxiliary hydraulic oil tank level; When the liquid level is relatively low, the oil in the oil pipe connecting the chassis oil and the auxiliary hydraulic oil tank is not exchanged in time. At this time, the one-way valve opens, allowing the gas to be discharged into the atmosphere through the overflow protection suction pipe, the one-way valve, the air pump intake pipe, the air pump and the air pump exhaust pipe.

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