Intelligentized tractor dual-acting clutch electro-hydraulic control system

Abstract

The present application belongs to the field of tractor electro-hydraulic control technology, and particularly relates to an intelligent double-acting clutch electro-hydraulic control system for tractors, comprising an oil tank, an oil suction filter, a gear pump, a high-pressure filter, a radiator, a control valve block, a clutch oil cylinder, a double-acting clutch, hydraulic pipes and a button switch; the control valve block is composed of an electromagnetic valve, a pressure measuring connector I, a valve body, a throttle valve, a sequence valve, a check valve and a pressure measuring connector II; the double-acting clutch electro-hydraulic control system controls a double-acting clutch which is a dry multi-friction plate clutch with a lower cost than the commonly used wet clutch on the market, and the double-acting clutch does not have the high assembly process requirement of the wet clutch, and can achieve the effect of convenient and labor-saving operation of the electrically controlled wet clutch, improving the tractor operation quality and operation efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tractor electro-hydraulic control, and particularly relates to an intelligent dual-acting clutch electro-hydraulic control system for a tractor. BACKGROUND

[0002] With the continuous development of society, people's material living standards are continuously improved, and users have higher and higher requirements for the work efficiency and work quality of tractors, and more and more requirements for the comfort of operation and the intelligent degree of the whole machine. The mechanical operation tractors commonly existing on the market at present cannot meet the needs of users. When rotary plowing is performed on small plots in the south, the power output is frequently interrupted by frequent operation of the auxiliary clutch handle, and the driver is very tired and uncomfortable. The tractors on the market at present commonly adopt a single-acting clutch + electric control wet PTO clutch scheme, which realizes one-key operation of the electric control button and is convenient and labor-saving to operate. However, there is a big problem, that is, the wet clutch has a very high requirement for the cleanliness of hydraulic oil, and the current domestic production, processing and assembly conditions are difficult to meet the high requirement for cleanliness; at the same time, the wet clutch has a complex structure and multiple sealing ring seals inside, and has a high requirement for the assembly process, and a careless mistake can easily damage the sealing ring during assembly. In this way, the production cost is increased, the reliability in use is poor, faults are prone to occur, and the maintenance cost is high; therefore, in view of the above technical status, there is an urgent need for an intelligent tractor electro-hydraulic control scheme that is labor-saving in use, convenient to assemble and install, has a low requirement for cleanliness, has a low cost and high reliability to solve the above problems and meet the use requirements of users for tractors. SUMMARY

[0003] The purpose of the present application is to provide an intelligent dual-acting clutch electro-hydraulic control system for a tractor, which can effectively solve the above problems by means of electro-hydraulic control of a dual-acting mechanical clutch, improve the work quality and work efficiency of the tractor, and meet the intelligent and electric control requirements of users for the tractor.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] An intelligent electro-hydraulic control system for a double-acting clutch in a tractor includes an oil tank, a suction filter, a gear pump, a high-pressure filter, a radiator, a control valve block, a clutch cylinder, a double-acting clutch, hydraulic pipes, and a push-button switch. The control valve block consists of a solenoid valve, a pressure test connector I, a valve body, a throttle valve, a sequence valve, a check valve, and a pressure test connector II. The opening pressure of the sequence valve is 1.6 MPa, and the opening pressure of the check valve is 0.5 MPa. Two bolt holes are provided on the valve body for fixing the valve body to the side of the tractor housing. The solenoid valve is arranged horizontally outwards perpendicular to the valve body to facilitate wiring harness connection. The valve is located on the left side of the top surface of the valve body to maintain the hydraulic cylinder control pressure at 1.6 MPa; the throttle valve is located in the middle of the top surface of the valve body to control the return oil flow of the clutch cylinder, thereby controlling the piston push-pull speed of the clutch cylinder and the engagement and disengagement time of the double-acting clutch; the pressure test connector I is located on the top surface of the valve body to measure the total pressure of the system; the pressure test connector II is located on the right side of the valve body to measure the pressure leading to the clutch cylinder; the one-way valve is located on the lower end face of the valve body to protect the radiator and prevent it from bursting due to excessive pressure after blockage.

[0006] Furthermore, the control valve block has five oil ports: a first working port P, a second working port A, a third working port T, a fourth working port T1, and a fifth working port T2. The first working port P is the system's inlet, through which hydraulic oil supplied by the gear pump enters the control valve block. The second working port A is connected to the left chamber of the clutch cylinder. The third working port T is connected to the radiator via a hydraulic line, supplying hydraulic oil to the radiator for cooling. The fourth working port T1 connects the check valve to the oil tank, allowing hydraulic oil to flow into the tank through the check valve when it is open. The fifth working port T2 is the clutch cylinder's return port, allowing the clutch cylinder's hydraulic oil to flow back to the oil tank when the clutch engages or disengages.

[0007] Furthermore, in the non-working state of the electro-hydraulic double-acting clutch hydraulic system, the double-acting clutch is a normally engaged clutch. The gear pump is connected to the engine gear chamber. When the engine starts, the gear pump begins to work, creating a negative pressure in the gear pump chamber, drawing hydraulic oil from the oil tank and through the suction filter into the gear pump. As the gear pump rotates continuously, it delivers the hydraulic oil in the pump chamber to the high-pressure filter, where it is filtered again and then delivered to the control valve block. Since the control valve block is in a non-working state at this time, i.e., the solenoid valve does not receive current, it does not perform any action. The oil delivered by the gear pump enters the radiator through the sequence valve, and after cooling, it returns to the oil tank. When the radiator malfunctions and becomes blocked, the check valve opens, and the hydraulic oil returns to the oil tank through the check valve, activating the radiator protection function and preventing excessive pressure from causing the radiator to burst.

[0008] Furthermore, in the working state of the electro-hydraulic double-acting clutch hydraulic system, the double-acting clutch is in the engaged state. By operating the button switch, the solenoid valve is energized, and the solenoid valve moves to the right under electromagnetic attraction. The left oil chamber of the valve core connects to the oil passage of the gear pump, forming a passage. Under the action of the sequence valve, the oil from the gear pump is momentarily pressurized to 1.6 MPa. The oil flows through the left chamber of the solenoid valve core into the left chamber of the clutch cylinder, pushing the piston to the right, thus disengaging the clutch. Simultaneously, excess oil continuously input by the gear pump flows through the sequence valve into the radiator, and after cooling, flows back to the oil tank. When disengagement is complete and engagement is required, the button switch is operated to de-energize the solenoid valve. The solenoid valve is de-energized, the valve core moves to the left, and the valve core oil chamber blocks the oil passage of the gear pump, allowing the clutch cylinder to communicate with the oil tank through the right chamber of the valve core. Under the force of the clutch return spring, the oil in the left chamber of the clutch cylinder passes through the solenoid valve and then through the throttle valve back to the oil tank, realizing the clutch transition from disengagement to engagement.

[0009] Furthermore, the throttle valve can adjust the oil flow rate, thereby controlling the hydraulic oil flow rate, and further controlling the cylinder return speed and clutch engagement time.

[0010] The beneficial effects of this invention are as follows: The overall structural design of the intelligent electro-hydraulic control system for a dual-acting clutch in this invention is scientific. Compared with the commonly used single-acting clutch + electro-hydraulic PTO clutch solution, the dual-acting clutch controlled by the electro-hydraulic control system of this invention is a dry multi-friction plate clutch, which is less expensive than the commonly used wet clutches on the market. Furthermore, this dual-acting clutch does not have the same high requirements for assembly processes or cleanliness as wet clutches, while achieving the convenient and labor-saving operation of an electro-hydraulic clutch. This improves the tractor's operating quality and efficiency, effectively meeting users' needs for intelligent and electronic control of tractors. In summary, this invention provides an intelligent tractor clutch control solution that is low-cost, has low assembly process requirements, low clutch operating environment requirements, and is convenient and labor-saving to operate. Attached Figure Description

[0011] Figure 1 This is the control logic diagram of the dual-acting clutch electro-hydraulic control system of the present invention;

[0012] Figure 2 This is a hydraulic schematic diagram of the non-working state of the electro-hydraulic controlled double-acting clutch hydraulic system of the present invention;

[0013] Figure 3 This is a hydraulic schematic diagram of the working state of the electro-hydraulic controlled double-acting clutch hydraulic system of the present invention;

[0014] Figure 4The control valve block structure in the double-acting clutch electro-hydraulic control system of the present invention Figure 1 ;

[0015] Figure 5 The control valve block structure in the double-acting clutch electro-hydraulic control system of the present invention Figure 2 ;

[0016] The marked positions in the diagram are: 1-oil tank, 2-suction filter, 3-gear pump, 4-high pressure filter, 5-radiator, 6-control valve block, 7-clutch cylinder, 8-double-acting clutch, 9-solenoid valve, 10-throttle valve, 11-sequence valve, 12-check valve, 13-pressure test connector I, 14-valve body, 15-pressure test connector II. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly or indirectly connected to the other element. When an element is referred to as "connected to" another element, it can be directly or indirectly connected to the other element. The terms "left" and "right" used in this application to indicate orientation are based on the specific structure shown in the accompanying drawings and do not constitute a limitation on the structure.

[0018] Specific Embodiment 1: As per the appendix to the specification of this invention Figure 1 To the instruction manual Figure 5 As shown, to address the problems of high assembly process requirements, high cleanliness requirements, inconvenient operation, high physical labor consumption, and reduced tractor operating efficiency associated with existing single-acting clutch + electronically controlled wet PTO clutch solutions, this invention provides an intelligent electro-hydraulic control system for a tractor's dual-acting clutch. This system includes: an oil tank 1, an oil suction filter 2, a gear pump 3, a high-pressure filter 4, a radiator 5, a control valve block 6, a clutch cylinder 7, a dual-acting clutch 8, hydraulic pipes, and push-button switches; as per the attached manual. Figure 2The diagram shows the hydraulic principle of the electro-hydraulic double-acting clutch hydraulic system in its non-operating state, i.e., the initial state when the tractor starts. The double-acting clutch 8 is a normally engaged clutch. The gear pump 3 is connected to the engine gear chamber. When the engine starts, the gear pump 3 begins to work, creating a negative pressure within its chamber, drawing hydraulic oil from the oil tank 1. The oil passes through the suction filter 2 and enters the gear pump 3. As the gear pump 3 rotates continuously, it delivers the hydraulic oil from its chamber to the high-pressure filter 4, where it is filtered again and then delivered to the control valve block 6. Since the control valve block 6 is in a non-operating state at this time, the solenoid valve 9 receives no current and does not perform any action. The oil delivered by the gear pump 3 enters the radiator 5 through the sequence valve 11, and after cooling, returns to the oil tank 1. When the radiator 5 malfunctions and becomes blocked, the check valve 12 opens, allowing the hydraulic oil to return to the oil tank 1 via the check valve 12, thus protecting the radiator 5 and preventing it from bursting due to excessive pressure.

[0019] As per the instruction manual Figure 3 The diagram shows the hydraulic principle of the electro-hydraulic dual-acting clutch system in operation. When the engine starts, the dual-acting clutch 8 is engaged. The driver operates the push-button switch to energize the solenoid valve 9. The solenoid valve 9 moves to the right under electromagnetic attraction, connecting the left oil chamber of the valve core to the oil passage of the gear pump 3, forming a passage. Under the action of the sequence valve 11, the oil pressure in the gear pump 3 is momentarily increased to 1.6 MPa. The oil flows through the left chamber of the solenoid valve 9 into the left chamber of the clutch cylinder 7, pushing the piston to the right and disengaging the clutch. Simultaneously, excess oil continuously supplied by the gear pump 3 flows through the sequence valve 11 into the radiator 5, and after cooling, flows back to the oil tank 1. When disengagement is complete and re-engagement is needed, the driver operates the push-button switch to de-energize the solenoid valve 9. At this time, the operation proceeds as planned. Figure 2 As shown. When solenoid valve 9 is de-energized, the valve core moves to the left, cutting off the oil passage from gear pump 3 to the valve core's oil chamber, allowing clutch cylinder 7 to connect to oil tank 1 through the right chamber of the valve core. Oil in the left chamber of clutch cylinder 7, under the force of the clutch return spring, passes through solenoid valve 9 and then through throttle valve 10 back to oil tank 1, thus achieving clutch engagement. Throttle valve 10 can adjust the flow rate of hydraulic oil, thereby controlling the hydraulic oil flow rate, further controlling the return speed of clutch cylinder 7, and further controlling the clutch engagement time.

[0020] As per the instruction manual Figure 4 Instruction manual attached Figure 5As shown, the control valve block 6 consists of a solenoid valve 9, a throttle valve 10, a sequence valve 11, a check valve 12, a pressure test connector I13, a valve body 14, and a pressure test connector II15. Two bolt holes are provided on the valve body 14 for fixing it to the side of the tractor housing. The solenoid valve 9 is arranged horizontally outwards perpendicular to the valve body 14. The sequence valve 11 is located on the left side of the top surface of the valve body 14. The throttle valve 10 is located in the middle of the top surface of the valve body 14. The pressure test connector I13, located on the top surface of the valve body 14, is used to measure the total system pressure. Measuring the system pressure here can help determine if there are leaks or other faults in the system. The pressure test connector II15 is located on the right side of the valve body 14 and is used to measure the pressure leading to the clutch cylinder 7. When the pressure value is less than the pressure maintained by the sequence valve 11 (1.6 MPa), this pressure test can be used to determine if there is a system fault. The check valve 12 is located on the lower end face of the valve body 14.

[0021] The control valve block 6 has five ports: specifically, the first working port P, the second working port A, the third working port T, the fourth working port T1, and the fifth working port T2. The first working port P is the system inlet, through which the hydraulic oil supplied by the gear pump 3 enters the control valve block 6. The second working port A is connected to the left chamber of the clutch cylinder 7. The third working port T is connected to the radiator 5 via a hydraulic line, supplying hydraulic oil to the radiator 5 for cooling. The fourth working port T1 connects the check valve 12 to the oil tank 1; when the check valve 12 is open, hydraulic oil can flow into the oil tank 1 through this port. The fifth working port T2 is the return port of the clutch cylinder 7, allowing the hydraulic oil in the clutch cylinder 7 to flow back to the oil tank 1 when the clutch transitions from disengagement to engagement.

[0022] Finally, it should be further explained that the intelligent tractor dual-acting clutch electro-hydraulic control system of the present invention, through innovative design of the hydraulic valve block, uses different principles to control the engagement and disengagement of the dry multi-friction plate dual-acting clutch. This system method differs from the commonly used methods for controlling wet clutches on the market, effectively reducing the operator's workload, and has low processing and installation costs, high reliability, convenient maintenance, and low maintenance costs. The application of this system can improve the tractor's operating quality and efficiency, and better meet users' control needs for intelligent tractors. The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. An intelligent electro-hydraulic control system for a dual-acting clutch in a tractor, characterized in that, The system includes an oil tank (1), an oil suction filter (2), a gear pump (3), a high-pressure filter (4), a radiator (5), a control valve block (6), a clutch cylinder (7), a double-acting clutch (8), hydraulic pipes, and a push-button switch; the control valve block (6) consists of a solenoid valve (9), a valve body (14), a throttle valve (10), a sequence valve (11), a check valve (12), a pressure test connector I (13), and a pressure test connector II (15); the opening pressure of the sequence valve (11) is 1.6 MPa, and the opening pressure of the check valve (12) is 0.5 MPa; two bolt holes are provided on the valve body (14) for fixing the valve body (14) to the side of the tractor body; the solenoid valve (9) is arranged horizontally outward perpendicular to the valve body (14) to facilitate the connection of the wiring harness; the sequential ... The sequence valve (11) is located on the left side of the top surface of the valve body (14) to ensure that the cylinder control pressure is maintained at 1.6 MPa; the throttle valve (10) is located in the middle of the top surface of the valve body (14) to control the return flow of the clutch cylinder (7), thereby controlling the piston push-pull speed of the cylinder and the engagement and disengagement time of the double-acting clutch (8); the pressure test connector I (13) is located on the top surface of the valve body (14) to measure the total pressure of the system; the pressure test connector II (15) is located on the right side of the valve body (14) to measure the pressure leading to the clutch cylinder (7); the one-way valve (12) is located on the lower end face of the valve body (14) to protect the radiator (5) and prevent it from bursting due to excessive pressure after being blocked.

2. The intelligent electro-hydraulic control system for a dual-acting clutch in a tractor according to claim 1, characterized in that, The control valve block (6) has five oil ports, namely the first working oil port P, the second working oil port A, the third working oil port T, the fourth working oil port T1, and the fifth working oil port T2. Among them, the first working oil port P is the oil inlet of the system, and the hydraulic oil delivered by the gear pump (3) enters the control valve block (6) through the first working oil port P. The second working oil port A is connected to the left chamber of the clutch cylinder (7). The third working oil port T is connected to the radiator (5) through the hydraulic pipeline, and the hydraulic oil is delivered to the radiator (5) for heat dissipation. The fourth working oil port T1 connects the check valve (12) to the oil tank (1). When the check valve (12) is opened, the hydraulic oil can flow into the oil tank (1) through the fourth working oil port T1. The fifth working oil port T2 is the return oil port of the clutch cylinder (7). When the clutch goes from disengagement to engagement, the hydraulic oil of the clutch cylinder (7) flows back to the oil tank (1).

3. The intelligent electro-hydraulic control system for a dual-acting clutch in a tractor according to claim 2, characterized in that, When the electro-hydraulic double-acting clutch hydraulic system is not in operation, the double-acting clutch (8) is a normally engaged clutch; the gear pump (3) is connected to the engine gear chamber. When the engine starts, the gear pump (3) starts to work, and a negative pressure is formed in the gear pump (3) chamber, which draws hydraulic oil from the oil tank (1) and enters the gear pump (3) through the suction filter (2); as the gear pump (3) rotates continuously, it delivers the hydraulic oil in the pump chamber to the high-pressure filter (4), and after being filtered again, it is delivered to the control valve. Block (6); because at this time the control valve block (6) is in a non-working state, that is, the solenoid valve (9) does not receive current, and the solenoid valve (9) does not perform any action; the oil delivered by the gear pump (3) enters the radiator (5) through the sequence valve (11), and returns to the oil tank (1) after cooling; when the radiator (5) malfunctions and causes blockage, the check valve (12) opens and the hydraulic oil returns to the oil tank (1) through the check valve (12), which plays a role in protecting the radiator (5) and avoids the radiator (5) from bursting due to excessive pressure.

4. The intelligent tractor dual-acting clutch electro-hydraulic control system according to claim 3, characterized in that, When the electro-hydraulic double-acting clutch hydraulic system is in operation, the double-acting clutch (8) is engaged. By operating the button switch, the solenoid valve (9) is energized, and the solenoid valve (9) moves to the right under electromagnetic attraction. The left oil chamber of the valve core is connected to the oil passage of the gear pump (3), forming a passage. Under the action of the sequence valve (11), the oil from the gear pump (3) is instantly pressurized to 1.6MPa. The oil flows into the left chamber of the clutch cylinder (7) through the left chamber of the solenoid valve (9), pushing the piston to move to the right, thus disengaging the clutch. At the same time, the gear pump (3) continuously pumps oil. Excess oil flows into the radiator (5) through the sequence valve (11), and after cooling, it flows back to the oil tank (1). When the separation is complete and engagement is required, the button switch is operated to de-energize the solenoid valve (9). The solenoid valve (9) is disconnected, the valve core moves to the left, and the oil chamber of the valve core blocks the oil passage from the gear pump (3), so that the clutch cylinder (7) is connected to the oil tank (1) through the right chamber of the valve core. Under the action of the clutch return spring, the oil in the left chamber of the clutch cylinder (7) passes through the solenoid valve (9) and then through the throttle valve (10) back to the oil tank (1), realizing the clutch from separation to engagement.

5. The intelligent tractor dual-acting clutch electro-hydraulic control system according to claim 4, characterized in that, The throttle valve (10) can adjust the flow rate of the oil. By adjusting the throttle valve (10), the hydraulic oil flow rate can be controlled, as well as the return speed of the clutch cylinder (7) and the clutch engagement time can be controlled.

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