Hydraulic oil level control system and method for large-horsepower tractor, and large-horsepower tractor

Abstract

The present invention provides a hydraulic oil level control system, a method and a large-horsepower tractor for a large-horsepower tractor. The hydraulic oil level control system for a large-horsepower tractor comprises: 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 connecting pipe for communicating the chassis oil with the secondary hydraulic oil tank. The chassis liquid level control suction pipe is communicated with 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 connecting pipe for communicating the chassis oil with the secondary hydraulic oil tank.

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, method, and 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 stirring 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, method, and 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 problems 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 connecting pipe for connecting the chassis oil and the secondary hydraulic oil tank. 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 connecting pipe for connecting the chassis oil and the secondary hydraulic oil tank.

[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 stirring loss during transmission, reducing the usage cost. It can output a large flow of hydraulic pressure 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 volume that can be output 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 third auxiliary hydraulic oil level position. At this time, the floating control handle touches and reverses 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 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 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, facilitating installation and maintenance.

[0012] Further, a chassis oil filling port and a chassis oil breather port are installed on 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, enabling the gas pressure to reach 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] Further, 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 decrease 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. 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.

[0016] Further, 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 facilitates 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 decrease 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 by increasing the amount of hydraulic oil. It can increase the amount of hydraulic oil while maintaining the normal oil level without any churning loss of the transmission, reducing the usage 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 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 become 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 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 decrease height depends on the magnitude of the external output. The maximum output volume is exactly the volume of the auxiliary hydraulic oil tank. It 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 stirring oil loss, reducing the use 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 too much, 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.

[0023] The beneficial effects of adopting the above further technical solution are: it is convenient to realize the adaptive adjustment of too much hydraulic oil and relatively low liquid level, improving the 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 FIG. 1 is one of the structural schematic diagrams of the hydraulic oil level control system for a large-horsepower tractor provided by an embodiment of the present invention.

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

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

[0028] DESCRIPTION OF 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 changeover 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 DESCRIPTION OF THE EMBODIMENTS

[0029] The principles and features of the present invention will be described below with reference to the accompanying 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 oil level is normal, the amount of hydraulic oil can be increased without transmission oil stirring loss, reducing the use cost. It can output high-flow hydraulic pressure externally.

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

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

[0034] 3. It can output high-flow hydraulic pressure externally.

[0035] As Figure 1 shown, further, the hydraulic oil level control valve 4 includes: a two-position three-way reversing valve 4b and a sub-hydraulic oil tank suction pipe 4d. The two-position three-way reversing 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: When the vehicle is started, the air pump works at this time. 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 reversing 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 chassis oil and sub-hydraulic oil tank connecting pipe 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 sub-hydraulic oil tank is balanced at the first sub-hydraulic oil tank liquid 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 liquid level remains unchanged. At this time, the first sub-hydraulic oil tank liquid level decreases, and the decreasing height depends on the magnitude of the external output. The maximum output volume 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-way three-position reversing 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-way three-position reversing valve 4b. The floating control handle 4c is located at the top of the auxiliary hydraulic oil tank 8.

[0038] The beneficial effect of adopting the above further technical solution is 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-way three-position reversing valve, and 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 in the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank does not exchange positions in time. 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-way three-position reversing valve 4b. 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 8.

[0040] The beneficial effect of adopting the above further technical solution is 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-way three-position reversing valve. The structure is simple, which is 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 at the top of the tractor chassis 1.

[0042] The beneficial effect of adopting the above further technical solution is 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 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.

[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 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. It reduces the oil agitation loss during transmission. It solves the demand for large flow rate output of the tractor for attachments. It solves the waste of oil agitation loss during 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 external output. 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 without any transmission oil agitation loss, reducing the usage cost. It can output a large flow rate of hydraulic oil.

[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 to the atmosphere through the hydraulic oil level control valve, the air pump intake pipe, the air pump, and the air pump exhaust pipe; this causes the pressure in the auxiliary hydraulic oil tank to become 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, since 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, causing the gas to be discharged to 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 exchange position in the connecting pipe between the chassis oil and the auxiliary hydraulic oil tank is not timely. At this time, the one-way valve opens, causing the gas to be discharged to 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.

[0052] The beneficial effects of adopting the above further technical solution are: it is convenient to achieve the adaptive adjustment of 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 starting the vehicle of the whole machine, such 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-position 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 output volume is exactly the volume of the auxiliary hydraulic oil tank 8.

[0055] When too much hydraulic oil is filled in the tractor chassis 1, such as Figure 3 , after starting the vehicle of the whole machine at this time, 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 to reverse the two-position 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 one-way valve 4a opens and discharges to the atmosphere through the overflow protection suction pipe 3 - one-way 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 trajectory of the gas.

[0058] 1. Add an auxiliary fuel tank to the hydraulic oil level control system. 2. Reduce the oil agitation loss during transmission. 3. Increase the hydraulic oil output volume of the tractor for attachments. Solve the problem of the tractor's demand for large-flow output for attachments. Solve the waste of oil agitation loss during 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 it; 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 large-horsepower tractor, characterized in that, Comprising: A tractor chassis (1), a chassis liquid level control suction pipe (2), a hydraulic oil level control valve (4), an air pump intake pipe (5), an air pump (6), an air pump exhaust pipe (7), a secondary hydraulic oil tank (8), and a chassis oil and secondary hydraulic oil tank connecting oil pipe (9). The suction port of the chassis liquid level control suction pipe (2) is flush with the second chassis oil liquid level (1b) and is located below the third chassis oil liquid level (1c). The hydraulic oil level control valve (4) is respectively connected to the chassis liquid level control suction pipe (2) and the secondary 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 secondary hydraulic oil tank (8) through the chassis oil and secondary hydraulic oil tank connecting oil pipe (9). The hydraulic oil level control valve (4) includes: a two-position three-way directional valve (4b) and a secondary hydraulic oil tank suction pipe (4d). The two-position three-way directional valve (4b) is respectively connected to the air pump intake pipe (5) and the chassis liquid level control suction pipe (2). One end of the secondary hydraulic oil tank suction pipe (4d) is connected to the top of the secondary hydraulic oil tank (8), and the other end of the secondary hydraulic oil tank suction pipe (4d) is connected to the chassis liquid level control suction pipe (2). 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 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). Both ends of the check 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 directional valve (4b). The floating control handle (4c) is located on the top of the secondary hydraulic oil tank (8).

2. The hydraulic oil level control system for a large horsepower tractor according to claim 1, wherein The floating control handle (4c) includes a float and a connecting rod. The connecting rod is connected to the two-position three-way directional valve (4b). The float is installed at the free end of the connecting rod. The float is located on the top of the secondary hydraulic oil tank (8).

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

4. A hydraulic oil level control system for a large horsepower tractor according to claim 1, characterized in that, Hydraulic oil is provided in both the tractor chassis (1) and the secondary hydraulic oil tank (8).

5. A hydraulic oil level control system for a large-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 secondary hydraulic oil tank (8). The bottom end of the secondary hydraulic oil tank (8) is higher than the bottom end of the tractor chassis (1). The tractor chassis (1) and the secondary hydraulic oil tank (8) are arranged adjacent to each other.

6. A large-horsepower tractor, characterized in that, A hydraulic oil level control system for a large-horsepower tractor comprising any one of the above claims 1 to 5.

7. A hydraulic oil level control method for a large - horsepower tractor, characterized in that, Based on the hydraulic oil level control system for a large-horsepower tractor according to any one of the above claims 1 to 5, the hydraulic oil level control method for a large-horsepower tractor includes: In the static state, the hydraulic oil in the tractor chassis is at the first chassis oil level, and the hydraulic oil in the auxiliary hydraulic oil tank is at the second auxiliary hydraulic oil tank level. The first chassis oil level and the second auxiliary hydraulic oil tank level are at the same liquid level height due to the principle of atmospheric pressure. When the vehicle of the whole machine is started, the air pump is started, and the gas in the auxiliary hydraulic oil tank is discharged to the atmosphere through the hydraulic oil level control valve, the air pump intake pipe, the air pump and the air pump exhaust pipe; this causes the pressure in the auxiliary hydraulic oil tank to become 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 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 auxiliary hydraulic oil tank is balanced at the first auxiliary hydraulic oil tank level.

8. A hydraulic oil level control method for a large-horsepower tractor according to claim 7, characterized in that, It also includes: When too much hydraulic oil is filled in the tractor chassis and the vehicle of the whole machine is started, since the third chassis oil 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 level position. At this time, the floating control handle touches the two-position three-way directional control valve, causing the gas to be discharged to 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 tank 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 does not exchange positions in time. At this time, the one-way valve opens, causing the gas to be discharged to 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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