Hydraulic control system for a clutch transfer case and construction machinery equipment

Abstract

The present invention provides a hydraulic control system for a clutch transfer case and an engineering machinery equipment. The hydraulic control system for the clutch transfer case includes: a clutch oil circuit, which is connected to the inside of the clutch transfer case and is used to realize the engagement and disengagement of the clutch transfer case; a lubricating oil circuit, which is connected to the clutch oil circuit and is connected to the inside of the clutch transfer case to lubricate the clutch transfer case; and an oil supply pipeline, which is connected to the clutch oil circuit to supply oil to the clutch oil circuit and the lubricating oil circuit. The present invention solves the control of the clutch of the clutch transfer case and the lubrication of the clutch transfer case through the same oil supply pipeline, simplifies the structure, and the system is simple and reliable.

Description

Technical Field

[0001] This application belongs to the technical field of hydraulic control of mechanical equipment. Specifically, it relates to a hydraulic control system for a clutch transfer case and an engineering machinery equipment. Background Art

[0002] In the related art, when the engines of construction machinery and vehicles need to drive multiple loads, the transfer case is a relatively mature design that can output the power of the engine to multiple power components respectively. The common transfer case and the engine have a non-disconnectable structure. When the engine starts, it needs to drive the transfer case and multiple power components to start simultaneously, which requires a high starting power for the engine. In high-altitude and cold regions, due to the high viscosity of the oil and the excessive load on the engine, the engine cannot start normally and requires a heating system to start. In addition, in hybrid vehicles, the technology of disconnecting and engaging the power between the engine and the transfer case is also needed.

[0003] The common solution to the above problems is to separately add a hydraulic clutch, which controls the engagement and separation between the engine and the transfer case through wet friction plates. The system composition is complex, the cost is high, and the hydraulic clutch is bulky and cannot meet the equipment requirements, especially in a hybrid system where it cannot be arranged.

[0004] To solve the above technical problems, the related art has proposed a clutch transfer case, which refers to a transfer case with an integrated design of the transfer case and the clutch. The disadvantage of the clutch transfer case in the related art is that the clutch control of the clutch transfer case and the lubrication of the clutch transfer case are respectively controlled by different hydraulic control systems, resulting in a relatively complex hydraulic control system for the clutch transfer case. Summary of the Invention

[0005] Embodiments according to the present invention aim to solve or improve at least one of the above technical problems.

[0006] A first object of embodiments according to the present invention is to provide a hydraulic control system for a clutch transfer case.

[0007] A second object of embodiments according to the present invention is to provide an engineering machinery equipment.

[0008] To achieve the first object of embodiments according to the present invention, the technical solution of the present invention provides a hydraulic control system for a clutch transfer case, including: a clutch oil circuit, which is connected to the inside of the clutch transfer case to realize the clutch of the clutch transfer case; a lubricating oil circuit, which is connected to the clutch oil circuit and is connected to the inside of the clutch transfer case to lubricate the clutch transfer case; and an oil supply pipeline, which is connected to the clutch oil circuit to supply oil to the clutch oil circuit and the lubricating oil circuit.

[0009] In this technical solution, the hydraulic control system for the clutch transfer case controls the engagement and disengagement of the clutch and the transfer case and lubricates them through a hydraulic oil circuit, which can simplify the structure. Specifically, the oil supply pipeline has opposite ends. One end of the oil supply pipeline is connected to an oil source, and the other end of the oil supply pipeline is connected to the clutch oil circuit. The lubricating oil circuit also has opposite ends. One end of the lubricating oil circuit is connected to the clutch oil circuit, and the other end of the lubricating oil circuit communicates with the parts inside the clutch transfer case that need to be lubricated. The clutch oil circuit also communicates with the inside of the clutch to achieve the disengagement of the clutch transfer case. It can be seen that the same oil source can supply oil to the clutch oil circuit through the oil supply pipeline and can also supply oil to the lubricating oil circuit, so that the lubrication and engagement and disengagement of the clutch transfer case can be achieved through the oil supply pipeline, simplifying the hydraulic control system for the clutch transfer case.

[0010] In addition, the technical solution provided by the embodiment of the present invention may also have the following additional technical features:

[0011] In the above technical solution, the hydraulic control system for the clutch transfer case further includes: a throttle valve, the lubricating oil circuit includes a plurality of lubricating branches, and at least one throttle valve is respectively arranged on each lubricating branch; and / or a filter, and the filter is arranged on the oil supply pipeline.

[0012] In this technical solution, by arranging a throttle valve on the lubricating oil circuit, the flow rate of the oil entering the lubricating points in the transfer case of the clutch transfer case can be controlled. The lubricating oil circuit is provided with a plurality of lubricating branches, and each lubricating branch corresponds to a lubricating point, so that the lubrication of a plurality of lubricating points can be achieved. In addition, by arranging at least one throttle valve on each lubricating branch, the flow rate flowing into each lubricating point can be controlled, which can avoid the gear ablation in the clutch transfer case caused by too little lubricating oil and can also avoid the large energy loss during the operation of the gears in the clutch transfer case caused by too much lubricating oil. The filter is used to filter various impurities appearing in the oil circuit of the oil supply pipeline to ensure that the hydraulic oil entering the control valve device will not cause blockage and other damages to the control valve device, so as to ensure the smooth progress of oil supply. Therefore, the damage of the clutch transfer case can be avoided as much as possible as a whole, and the use efficiency and service life of the clutch transfer case are improved.

[0013] In any of the above technical solutions, the hydraulic control system for the clutch transfer case further includes: a control valve device, and the control valve device is arranged on the clutch oil circuit; wherein, the clutch transfer case includes an engagement oil port and a disengagement oil port, and the clutch oil circuit is respectively connected to the engagement oil port and the disengagement oil port through the control valve device.

[0014] In this technical solution, a clutch oil inlet and a clutch oil outlet are provided inside the clutch of the clutch transfer case. The clutch oil inlet and the clutch oil outlet extend to the outside of the clutch respectively to connect to an external hydraulic control system for the clutch transfer case. The control valve device is connected to the clutch oil inlet and the clutch oil outlet. The oil supply pipeline supplies oil to the clutch oil inlet through the clutch oil circuit and the control valve device to control the engagement between the transfer case and the engine, or the oil supply pipeline supplies oil to the clutch oil outlet through the clutch oil circuit and the control valve device to control the separation between the transfer case and the engine. The control valve device is applied to the hydraulic control system for the clutch transfer case to control the oil inlet of the clutch oil inlet or the clutch oil outlet, so as to drive the clutch to control the separation and engagement between the clutch transfer case and the engine. The overall structure is simple, easy to implement, and reduces the equipment cost.

[0015] In any of the above technical solutions, the control valve device includes: a first control valve for controlling the supply of oil from the clutch oil circuit to the clutch oil inlet; a second control valve for controlling the supply of oil from the clutch oil circuit to the clutch oil outlet.

[0016] In this technical solution, the oil circuit from the clutch oil circuit to the clutch oil inlet is controlled by the first control valve, and the oil circuit from the clutch oil circuit to the clutch oil outlet is controlled by the second control valve. When the first control valve acts to make the clutch oil inlet receive oil, and the second control valve acts to make the clutch oil outlet return oil, the clutch of the clutch transfer case can control the mutual engagement between the transfer case and the engine. Similarly, when the first control valve acts to make the clutch oil inlet return oil, and the second control valve acts to make the clutch oil outlet receive oil, the clutch of the clutch transfer case can control the mutual separation between the transfer case and the engine. By respectively controlling the alternating oil inlet of the clutch oil inlet and the clutch oil outlet through two control valves, the purpose of controlling the clutch is achieved, and the control method is simple and easy to implement.

[0017] In any of the above technical solutions, the control valve device includes: a reversing valve having a first working port, a second working port, an oil inlet port, and an oil return port. The oil inlet port is connected to the oil supply pipeline through the clutch oil circuit, the oil return port is used for oil return, the first working port is connected to the clutch oil inlet, and the second working port is connected to the clutch oil outlet; wherein, in the first working state of the reversing valve, the first working port is connected to the oil inlet port, and the second working port is connected to the oil return port; in the second working state of the reversing valve, the first working port is connected to the oil return port, and the second working port is connected to the oil inlet port.

[0018] In this technical solution, the oil inlet of the reversing valve receives oil from the clutch oil circuit, and the oil return port of the reversing valve returns oil to the oil supply pipeline. The first working port of the reversing valve is connected to the engagement oil port. Among them, when the clutch of the clutch transfer case can control the engagement between the transfer case and the engine, that is, in the first working state, the first working port is connected to the oil inlet, and the second working port is connected to the oil return port, so that the oil inlet, the first working port, the second working port, and the oil return port form a through oil circuit. That is, the clutch oil circuit can be controlled to lead to the engagement oil port through the first working port of the reversing valve, and the oil is returned through the second working port, so that the clutch of the clutch transfer case can control the engagement between the transfer case and the engine. When the clutch of the clutch transfer case can control the separation between the transfer case and the engine, that is, in the second working state, the second working port is connected to the separation oil port, the first working port is connected to the oil return port, and the second working port is connected to the oil inlet, so that the oil inlet, the second working port, the first working port, and the oil return port form a through oil circuit. When the first working port returns oil and the second working port receives oil, the clutch of the clutch transfer case can control the separation between the transfer case and the engine. By respectively controlling the alternating oil supply of the engagement oil port and the separation oil port through the first working port and the second working port of a control valve, the purpose of controlling the clutch is achieved, and the control method of the control valve device is further simplified.

[0019] In any of the above technical solutions, the hydraulic control system for the clutch transfer case further includes: a pressure maintaining valve group, which is used to control the oil pressure entering the control valve device and / or the lubricating oil circuit.

[0020] In this technical solution, when the oil entering the clutch oil circuit is hydraulic oil with a certain pressure, in order to avoid the pressure of the hydraulic oil entering the engagement oil port or the separation oil port being too high or too low, which may cause damage to the clutch of the clutch transfer case, therefore, the pressure maintaining valve group is arranged on the clutch oil circuit to ensure the pressure of the hydraulic oil entering the first control valve and the second control valve, so that the pressure of the hydraulic oil entering the engagement oil port and the separation oil port meets certain requirements to ensure the normal use of the clutch of the clutch transfer case.

[0021] In any of the above technical solutions, the pressure maintaining valve group includes: a relief valve, which is connected to the clutch oil circuit; among them, the lubricating oil circuit is connected to the relief valve, and there are multiple lubricating parts in the clutch transfer case, and the lubricating oil circuit is connected to the lubricating parts.

[0022] In this technical solution, the overflow valve can play a safety protection role for the clutch oil circuit. When the pressure of the clutch oil circuit exceeds the specified value, the safety valve opens, discharging a part of the hydraulic oil in the clutch oil circuit to keep the system pressure from exceeding the allowable value, thus ensuring that the system does not have an accident due to excessive pressure. Since there are multiple lubrication parts in the clutch transfer case, one end of the lubricating oil circuit is connected to the overflow valve, and the other end of the lubricating oil circuit is connected to the lubrication parts, enabling the hydraulic oil coming out of the oil outlet of the overflow valve to lubricate the lubrication parts, ensuring good lubrication between the moving parts of the clutch transfer case, saving lubrication costs. Therefore, the same oil source can achieve two functions of power clutch and lubrication through the overflow valve, pressure reducing valve, etc.

[0023] In any of the above technical solutions, the pressure maintaining valve group further includes: a pressure reducing valve, which has a first port, a second port, and a third port. The first port is connected to the oil supply pipeline through the clutch oil circuit, the second port is connected to the control valve device, and the third port is used for oil return; a pressure detection device, which is connected to the oil circuit between the pressure reducing valve and the control valve device, and is used to detect the outlet pressure of the pressure reducing valve.

[0024] In this technical solution, the pressure reducing valve is a valve that reduces the inlet pressure to a required outlet pressure through adjustment and relies on the energy of the medium itself to automatically keep the outlet pressure stable. The pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, relying on the control and regulation of the system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range. This technical solution uses a pressure sensor as the pressure detection device. The hydraulic oil entering the clutch oil circuit enters the overflow valve and the pressure reducing valve respectively. One oil outlet of the pressure reducing valve is connected to the fuel tank, and the other oil outlet of the pressure reducing valve can be respectively connected to the oil inlet of the first control valve and the oil inlet of the second control valve. The pressure sensor is used to detect the pressure of the hydraulic oil in the oil circuit between the oil outlet of the pressure reducing valve and the oil inlets of the first control valve and the second control valve. When the oil pressure detected by the pressure sensor exceeds the preset value, an alarm signal is sent to ensure the safety of the hydraulic control system used for the clutch transfer case.

[0025] In any of the above technical solutions, the hydraulic control system for the clutch transfer case further includes: an oil pump, which is connected to the fuel tank; a power device, which is connected to the oil pump; wherein, the oil pump is arranged on the oil supply pipeline.

[0026] In this technical solution, the system composed of an oil pump and a power device can serve as an oil source, and the oil pump is connected to a fuel tank. The oil supply pipeline has opposite ends. Among them, one end of the oil supply pipeline is connected to the oil source, and the other end of the oil supply pipeline is connected to the clutch oil circuit. One end of the oil supply pipeline extends into the fuel tank, and the oil pump is arranged on the oil supply pipeline and is used to supply oil from the fuel tank to the oil supply pipeline under the drive of the power device. The oil source is used to provide power oil for the hydraulic control system of the clutch and transfer case. The oil supply pipeline serves as a circulation channel for the power oil. An electric motor is used as the power device to drive the oil pump, and the structure is simple and reliable. The fuel tank, oil pump and power device can be used as an independent power unit, which can avoid the abnormal main system from having an adverse impact on the clutch and transfer case.

[0027] To achieve the second object of the embodiments of the present invention, the technical solution of the present invention provides a construction machinery and equipment, including: an engine; a clutch and transfer case; the hydraulic control system for the clutch and transfer case in any of the above technical solutions; wherein, the input end of the clutch and transfer case is connected to the engine, and the hydraulic control system for the clutch and transfer case is used to control the mutual engagement or mutual separation of the input end and the output end of the clutch and transfer case.

[0028] In this technical solution, the construction machinery and equipment provided according to the technical solution of the present invention includes the hydraulic control system for the clutch and transfer case according to any technical solution of the present invention. Therefore, it has all the beneficial effects of the hydraulic control system for the clutch and transfer case according to any technical solution of the present invention.

[0029] The additional aspects and advantages of the embodiments of the present invention will become obvious in the following description part, or will be learned through the practice of the embodiments of the present invention. Description of the Drawings

[0030] The above and / or additional aspects and advantages of the embodiments of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0031] Figure 1 One of the schematic diagrams of the hydraulic control system for the clutch and transfer case according to some embodiments of the present invention;

[0032] Figure 2 Another schematic diagram of the hydraulic control system for the clutch and transfer case according to some embodiments of the present invention;

[0033] Figure 3 Another schematic diagram of the hydraulic control system for the clutch and transfer case according to some embodiments of the present invention;

[0034] Figure 4 A schematic cross-sectional structure diagram of the clutch and transfer case according to some embodiments of the present invention;

[0035] Figure 5 It is a schematic diagram of the composition of a construction machinery and equipment according to some embodiments of the present invention.

[0036] Among them, Figures 1 to 5 The corresponding relationship between the reference numerals and the component names in the figure is as follows:

[0037] 10: Construction machinery and equipment; 100: Hydraulic control system for the clutch and power take-off box; 110: Oil source; 112: Fuel tank; 114: Oil pump; 116: Power device; 120: Control valve device; 122: First control valve; 124: Second control valve; 126: Directional control valve; 1262: First working port; 1264: Second working port; 1266: Inlet port; 1268: Return port; 130: Oil supply pipeline; 140: Lubricating oil pipeline; 142: Lubricating branch; 150: Throttle valve; 160: Clutch oil pipeline; 170: Filter; 180: Temperature detection device; 190: Pressure maintaining valve group; 192: Pressure reducing valve; 1922: First port; 1924: Second port; 1926: Third port; 194: Relief valve; 196: Pressure detection device; 200: Clutch and power take-off box; 210: Engaging oil port; 220: Disengaging oil port; 230: Lubricating part; 300: Engine. Detailed implementation manners

[0038] In order to be able to more clearly understand the above-mentioned objects, features, and advantages of the embodiments according to the present invention, the embodiments according to the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0039] Many specific details are set forth in the following description in order to fully understand the embodiments according to the present invention. However, the embodiments according to the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the embodiments according to the present invention is not limited by the specific embodiments disclosed below.

[0040] In the related art, a transfer case with a hydraulic clutch includes a transfer case housing fixedly connected to the flywheel housing of the engine, an elastic diaphragm connected to the engine flywheel, the elastic diaphragm is installed on the hydraulic clutch housing, and the hydraulic clutch housing is connected to the input shaft of the transfer case through a driving friction plate and a driven friction plate. The hydraulic clutch housing is also connected to an oil pump drive shaft for driving the oil pump of the hydraulic system. The input shaft of the transfer case is integrally formed with or connected to the input gear through splines as the input of the transfer case. The input gear can mesh with multiple output gears simultaneously. In the related art, during the lubrication process of the transfer case, the flow rate of the lubricating oil in the lubricating oil passage for lubricating components such as the transmission gears and bearings is not controlled. The consequence of this is that too little lubricating oil causes gear ablation, and too much lubricating oil causes a large energy loss during operation.

[0041] In summary, the embodiments of the present invention will solve the technical problems existing in the prior art one by one or in combination.

[0042] Next, refer to Figures 1 to 5 Describe a hydraulic control system 100 for a clutch transfer case and an engineering machinery equipment 10 according to some embodiments of the present invention.

[0043] Embodiment 1

[0044] As Figure 1 shown, this embodiment provides a hydraulic control system 100 for a clutch transfer case, including: a clutch oil circuit 160, a lubricating oil circuit 140, and an oil supply pipeline 130. The clutch oil circuit 160 communicates with the inside of the clutch transfer case 200 to achieve the clutch of the clutch transfer case 200. The lubricating oil circuit 140 is connected to the clutch oil circuit 160 and communicates with the inside of the clutch transfer case 200 to lubricate the clutch transfer case 200. The oil supply pipeline 130 is connected to the clutch oil circuit 160 to supply oil to the clutch oil circuit 160 and the lubricating oil circuit 140.

[0045] In this embodiment, in combination with as Figure 4 and Figure 5As shown in the figure, the clutch and transfer case 200 is composed of a clutch and a transfer case. At least a part of the clutch extends into the transfer case, making the transfer case and the clutch an integrated design, with a simple and reliable system. The clutch can be used to drive the transfer case to engage with the engine 300 or to drive the transfer case to disengage from the engine 300. The hydraulic control system 100 for the clutch and transfer case is used to control the clutch and also lubricate the transfer case. To simplify the structure, the hydraulic control system 100 for the clutch and transfer case controls the clutch and lubricates the transfer case through a hydraulic oil circuit. Specifically, the lubricating oil circuit 140 has opposite ends. One end of the lubricating oil circuit 140 is connected to the clutch oil circuit 160, and the other end of the lubricating oil circuit 140 communicates with the parts inside the clutch and transfer case 200 that need to be lubricated. The clutch oil circuit 160 also communicates with the inside of the clutch to achieve the separation of the clutch and transfer case 200. It can be seen that by supplying oil to the clutch oil circuit 160 through the oil supply pipeline 130, oil can also be supplied to the lubricating oil circuit 140, thereby achieving the lubrication and clutch operation of the clutch and transfer case 200 through the oil supply pipeline 130, simplifying the hydraulic control system 100 for the clutch and transfer case.

[0046] Embodiment 2

[0047] As Figure 2 shown, this embodiment provides a hydraulic control system 100 for a clutch and transfer case. In addition to the technical features of the above embodiment, this embodiment further includes the following technical features:

[0048] The hydraulic control system 100 for the clutch and transfer case further includes: a throttle valve 150. Among them, the lubricating oil circuit 140 includes multiple lubricating branches 142, and at least one throttle valve 150 is respectively arranged on each lubricating branch 142.

[0049] In this embodiment, by arranging the throttle valve 150 on the lubricating oil circuit 140, the flow rate of the oil entering the lubricating points inside the transfer case of the clutch and transfer case 200 can be controlled. The lubricating oil circuit 140 is provided with multiple lubricating branches 142, and each lubricating branch 142 corresponds to a lubricating point, which can achieve the lubrication of multiple lubricating points. In addition, by arranging at least one throttle valve 150 on each lubricating branch 142, the flow rate flowing into each lubricating point can be controlled, which can avoid gear ablation in the clutch and transfer case 200 due to too little lubricating oil, and can also avoid large energy loss during the operation of the gears in the clutch and transfer case 200 due to too much lubricating oil. Therefore, damage to the clutch and transfer case 200 can be avoided as much as possible as a whole, improving the service efficiency and service life of the clutch and transfer case 200.

[0050] Embodiment 3

[0051] As Figure 2 and Figure 4As shown, this embodiment provides a hydraulic control system 100 for a clutch transfer case. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0052] The hydraulic control system 100 for a clutch transfer case further includes: a control valve device 120, and the control valve device 120 is arranged on the clutch oil circuit 160. Among them, the clutch transfer case 200 includes an engagement oil port 210 and a disengagement oil port 220, and the clutch oil circuit 160 is respectively connected to the engagement oil port 210 and the disengagement oil port 220 through the control valve device 120.

[0053] In this embodiment, in combination with Figure 2 and Figure 4 As shown, the clutch of the clutch transfer case 200 is provided with an engagement oil port 210 and a disengagement oil port 220, and the engagement oil port 210 and the disengagement oil port 220 respectively extend to the outside of the clutch to connect to the external hydraulic control system 100 for the clutch transfer case. The control valve device 120 is connected to the engagement oil port 210 and the disengagement oil port 220. The oil supply pipeline 130 supplies oil to the engagement oil port 210 through the clutch oil circuit 160 and the control valve device 120 to control the engagement between the transfer case and the engine 300, or the oil supply pipeline 130 supplies oil to the disengagement oil port 220 through the clutch oil circuit 160 and the control valve device 120 to control the disengagement between the transfer case and the engine 300. The control valve device 120 is applied in the hydraulic control system 100 for the clutch transfer case to control the oil inlet of the engagement oil port 210 or the disengagement oil port 220, so as to achieve the purpose of driving the clutch to control the mutual disengagement and mutual engagement between the clutch transfer case 200 and the engine 300. The overall structure is simple, easy to implement, and reduces the equipment cost.

[0054] Embodiment 4

[0055] As Figure 2 shown, this embodiment provides a hydraulic control system 100 for a clutch transfer case. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0056] The control valve device 120 includes: a first control valve 122 and a second control valve 124. The first control valve 122 is used to control the clutch oil circuit 160 to supply oil to the engagement oil port 210. The second control valve 124 is used to control the clutch oil circuit 160 to supply oil to the disengagement oil port 220.

[0057] In this embodiment, in combination with Figure 2 and Figure 4As shown in the figure, the oil path of the clutch oil circuit 160 leading to the engagement oil port 210 is controlled by the first control valve 122, and the oil path of the clutch oil circuit 160 leading to the disengagement oil port 220 is controlled by the second control valve 124. When the first control valve 122 operates to allow oil to enter the engagement oil port 210 and the second control valve 124 operates to allow oil to return from the disengagement oil port 220, the clutch of the clutch transfer case 200 can control the engagement between the transfer case and the engine 300. Similarly, when the first control valve 122 operates to allow oil to return from the engagement oil port 210 and the second control valve 124 operates to allow oil to enter the disengagement oil port 220, the clutch of the clutch transfer case 200 can control the disengagement between the transfer case and the engine 300. By respectively controlling the alternating oil inlet of the engagement oil port 210 and the disengagement oil port 220 through two control valves, the purpose of controlling the clutch of the clutch transfer case 200 is achieved. The control method is simple and easy to implement.

[0058] In this embodiment, the first control valve 122 and the second control valve 124 are respectively electro-control valves. In order to achieve the automatic oil inlet of the engagement oil port 210 or the disengagement oil port 220, the first control valve 122 and the second control valve 124 are respectively electro-control valves. For example, solenoid valves are used as electro-control valves. Solenoid valves can achieve the purpose of automatic opening or closing according to the output of signals and are commonly used in hydraulic systems. One oil outlet of the first control valve 122 is connected to the engagement oil port 210 through an oil path, and another oil outlet of the first control valve 122 is connected to the oil source 110 or the fuel tank 112 through an oil path for oil return. Similarly, one oil outlet of the second control valve 124 is connected to the disengagement oil port 220 through an oil path, and another oil outlet of the second control valve 124 is connected to the oil source 110 or the fuel tank 112 through an oil path for oil return.

[0059] Embodiment 5

[0060] As Figure 3 shown, this embodiment provides a hydraulic control system 100 for a clutch transfer case. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0061] The control valve device 120 further includes a reversing valve 126. The reversing valve 126 has a first working port 1262, a second working port 1264, an oil inlet 1266, and an oil return port 1268. The oil inlet 1266 is connected to the oil supply pipeline 130 through the clutch oil circuit 160. The oil return port 1268 is used for oil return. The first working port 1262 is connected to the engaging oil port 210, and the second working port 1264 is connected to the disengaging oil port 220. Among them, in the first working state of the reversing valve 126, the first working port 1262 is connected to the oil inlet 1266, and the second working port 1264 is connected to the oil return port 1268. In the second working state of the reversing valve 126, the first working port 1262 is connected to the oil return port 1268, and the second working port 1264 is connected to the oil inlet 1266.

[0062] In this embodiment, the oil inlet 1266 of the reversing valve 126 receives oil from the clutch oil circuit 160, and the oil return port 1268 of the reversing valve 126 is connected to the fuel tank 112 or the oil return pipeline for oil return. The first working port 1262 of the reversing valve 126 is connected to the engaging oil port 210. Among them, in the working condition where the clutch of the clutch transfer case can control the engagement between the transfer case and the engine, that is, in the first working state, the first working port 1262 is connected to the oil inlet 1266, and the second working port 1264 is connected to the oil return port 1268, so that the oil inlet 1266, the first working port 1262, the second working port 1264, and the oil return port 1268 form a through oil circuit. That is, through the first working port 1262 of the reversing valve 126, the clutch oil circuit 160 can be controlled to lead to the engaging oil port 210, and oil can be returned through the second working port 1264, so that the clutch of the clutch transfer case can control the engagement between the transfer case and the engine. In the working condition where the clutch of the clutch transfer case can control the separation between the transfer case and the engine, that is, in the second working state, the second working port 1264 is connected to the disengaging oil port 220, the first working port 1262 is connected to the oil return port 1268, and the second working port 1264 is connected to the oil inlet 1266, so that the oil inlet 1266, the second working port 1264, the first working port 1262, and the oil return port 1268 form a through oil circuit. When the first working port 1262 returns oil and the second working port 1264 receives oil, the clutch of the clutch transfer case can control the separation between the transfer case and the engine. By respectively controlling the alternate oil supply of the engaging oil port and the disengaging oil port through the first working port 1262 and the second working port 1264 of a control valve, the purpose of controlling the clutch is achieved, and the control mode of the control valve device 120 is further simplified.

[0063] Embodiment 6

[0064] As Figure 2As shown in the figure, this embodiment provides a hydraulic control system 100 for a clutch transfer case. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0065] The hydraulic control system 100 for a clutch transfer case further includes: a pressure maintaining valve group 190, and the pressure maintaining valve group 190 is used to control the oil pressure entering the control valve device 120 and / or the lubricating oil path 140.

[0066] In this embodiment, when the oil entering the clutch oil path 160 or the lubricating oil path 140 is hydraulic oil, the hydraulic oil has a certain pressure. Taking the oil path entering the control valve device 120 as an example, in order to avoid the pressure of the hydraulic oil entering the engaging oil port 210 or the disengaging oil port 220 being too high or too low, thus causing damage to the clutch of the clutch transfer case 200. Therefore, the pressure maintaining valve group 190 is arranged on the clutch oil path 160 to ensure the pressure of the hydraulic oil entering the first control valve 122 and the second control valve 124, so that the pressure of the hydraulic oil entering the engaging oil port 210 and the disengaging oil port 220 meets certain requirements. For example, the required oil pressure is 20 bar, thereby avoiding phenomena such as clutch slippage and seizure, and ensuring the normal use of the clutch of the clutch transfer case 200.

[0067] Embodiment 7

[0068] As Figure 2 As shown in the figure, this embodiment provides a hydraulic control system 100 for a clutch transfer case. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0069] The pressure maintaining valve group 190 includes a relief valve 194, and the relief valve 194 is connected to the clutch oil path 160. The opening pressure of the relief valve 194 is 20 bar to 30 bar. Among them, the lubricating oil path 140 is connected to the relief valve 194, and there are multiple lubricating parts 230 in the clutch transfer case 200, and the lubricating oil path 140 is connected to the lubricating parts 230.

[0070] In this embodiment, the overflow valve 194 can provide safety protection for the oil supply pipeline 130 and the clutch oil circuit 160. When the pressure in the oil supply pipeline 130 and the clutch oil circuit 160 exceeds the specified value, the safety valve opens, discharging a part of the hydraulic oil in the clutch oil circuit 160 to keep the system pressure from exceeding the allowable value. The opening pressure of the overflow valve 194 is 20 bar to 30 bar, and preferably 25 bar (bar, pressure unit), thus ensuring that the system will not have an accident due to excessive pressure. Since there are multiple lubrication parts 230 in the clutch transfer case 200, one end of the lubricating oil pipeline 140 is connected to the overflow valve 194, and the other end is connected to the lubrication parts 230, enabling the hydraulic oil flowing out of the oil outlet of the overflow valve 194 to lubricate the lubrication parts 230, ensuring good lubrication between the moving parts of the clutch transfer case 200 and saving lubrication costs. Therefore, the same oil source can achieve two functions of power clutch and lubrication through the overflow valve 194, pressure reducing valve 192, etc.

[0071] Embodiment 8

[0072] As Figure 2 shown, this embodiment provides a hydraulic control system 100 for a clutch transfer case. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0073] The pressure maintaining valve group 190 further includes: a pressure reducing valve 192 and a pressure detection device 196. The pressure reducing valve 192 has a first port 1922, a second port 1924, and a third port 1926. The first port 1922 is connected to the oil supply pipeline 130 through the clutch oil circuit 160, the second port 1924 is connected to the control valve device 120, and the third port 1926 is for oil return. The pressure detection device 196 is connected to the oil circuit between the pressure reducing valve 192 and the control valve device 120, and is used to detect the outlet pressure of the pressure reducing valve 192.

[0074] In this embodiment, the pressure reducing valve 192 is connected to the control valve device 120. The pressure reducing valve 192 is used to control the oil pressure entering the control valve device 120 to be 15 bar to 25 bar. The first port 1922 is connected to the oil supply pipeline 130 through the clutch oil circuit 160 for oil inlet. The second port 1924 is connected to the control valve device 120 for inputting hydraulic oil to the control valve device 120. The third port 1926 can be connected to the fuel tank 112 through a pipeline for oil return. The opening pressure of the overflow valve 194 is greater than the unloading pressure of the pressure reducing valve. For example, in one embodiment, the opening pressure of the overflow valve 194 is 25 bar, and the pressure reducing valve 192 is used to control the oil pressure entering the control valve device 120 to be 20 bar. The pressure reducing valve 192 is a valve that reduces the inlet pressure to a required outlet pressure through adjustment and relies on the energy of the medium itself to automatically maintain the stability of the outlet pressure. The pressure reducing valve 192 is a throttling element with variable local resistance, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, relying on the control and system adjustment, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range. The pressure detection device 196 in this embodiment can be a pressure sensor. The pressure detection device 196 is used to detect the outlet oil pressure of the pressure reducing valve 192. When the outlet oil pressure is too low, an alarm is given. The hydraulic oil entering the clutch oil circuit 160 enters the overflow valve 194 and the pressure reducing valve 192 respectively. One oil outlet of the pressure reducing valve 192 is used for oil return. The other oil outlet of the pressure reducing valve 192 can be respectively connected to the oil inlet of the first control valve 122 and the oil inlet of the second control valve 124. The pressure sensor is used to detect the pressure of the hydraulic oil in the oil circuit between the oil outlet of the pressure reducing valve 192 and the oil inlets of the first control valve 122 and the second control valve 124. When the oil pressure detected by the pressure sensor exceeds the preset value, an alarm signal is sent. The pressure reducing valve 192 is used to control the oil pressure entering the control valve device 120 to be 15 bar to 25 bar, preferably 20 bar, to ensure the safety of the hydraulic control system 100 used for the clutch transfer case.

[0075] Embodiment 9

[0076] As Figure 2 shown, this embodiment provides a hydraulic control system 100 for a clutch transfer case. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0077] The hydraulic control system 100 for a clutch transfer case further includes: an oil pump 114 and a power device 116. The oil pump 114 is connected to the fuel tank 112. The power device 116 is connected to the oil pump 114. Among them, the oil pump 114 is arranged on the oil supply pipeline 130.

[0078] In this embodiment, the system composed of the oil pump 114 and the power device 116 can serve as the oil source 110, and the oil pump 114 is connected to the fuel tank 112. The oil supply pipeline 130 has opposite ends. Among them, one end of the oil supply pipeline 130 is connected to the oil source 110, the other end of the oil supply pipeline 130 is connected to the clutch oil circuit 160, and one end of the oil supply pipeline 130 extends into the fuel tank 112. The oil pump 114 is arranged on the oil supply pipeline 130 and is used to supply oil from the fuel tank 112 to the oil supply pipeline 130 under the drive of the power device 116. The oil source 110 is used to provide power oil for the hydraulic control system 100 of the clutch transfer case. The oil supply pipeline 130 serves as the flow channel of the power oil. An electric motor is used as the power device 116 to drive the oil pump 114, and the structure is simple and reliable. The fuel tank 112, the oil pump 114 and the power device 116 can serve as an independent power unit, which can avoid the adverse impact of the abnormal main system on the clutch transfer case 200. Through the same oil source 110, it can supply oil from the oil supply pipeline 130 to the clutch pipeline 160, or can also supply oil to the lubricating oil pipeline 140. Thus, the lubrication and clutch of the clutch transfer case 200 can be realized through the same oil source 110, which simplifies the hydraulic control system 100 of the clutch transfer case. When the first control valve 122 acts to make the engaging oil port 210 receive oil, and the second control valve 124 acts to make the disengaging oil port 220 communicate with the fuel tank 112 for oil return, the clutch of the clutch transfer case 200 can control the mutual engagement between the transfer case and the engine 300. Similarly, when the first control valve 122 acts to make the engaging oil port 210 communicate with the fuel tank 112 for oil return, and the second control valve 124 acts to make the disengaging oil port 220 receive oil, the clutch of the clutch transfer case 200 can control the mutual separation between the transfer case and the engine 300. The filter 170 is located between the oil source 110 and the clutch oil circuit 160 and is used to filter the oil to avoid accidents such as blockage of the oil after entering the clutch oil circuit 160 and the lubricating oil pipeline 140.

[0079] Embodiment 10

[0080] As Figure 5 shown, this embodiment provides a construction machinery equipment 10, including: an engine 300, a clutch transfer case 200, and the hydraulic control system 100 for the clutch transfer case in any one of the embodiments, which is used to control the mutual engagement or mutual separation between the clutch transfer case 200 and the engine 300.

[0081] In this embodiment, since the construction machinery equipment 10 provided according to the embodiment of the present invention includes the hydraulic control system 100 for the clutch transfer case in any one of the embodiments of the present invention, it has all the beneficial effects of the hydraulic control system 100 for the clutch transfer case in any one of the embodiments of the present invention.

[0082] Embodiment 11

[0083] As Figure 2 and Figure 5 shown, this embodiment provides a hydraulic control system 100 for a clutch transfer case, a clutch transfer case 200, and a construction machinery equipment 10. The hydraulic control system 100 for the clutch transfer case includes: an engagement oil port 210, a disengagement oil port 220, a first solenoid valve, a second solenoid valve, a relief valve 194, a pressure reducing valve 192, a pressure sensor, an oil source 110, an oil supply pipeline 130, a filter 170, a lubricating oil pipeline 140, and a temperature detection device 180. The temperature detection device 180 can detect the temperature of the oil source 110. When the oil temperature is too high, the system will be damaged, and an alarm can be given when the oil temperature is too high. In addition, in order to avoid the inability to start the hydraulic control system 100 for the clutch transfer case normally when used in a low-temperature environment such as on the plateau, the temperature detection device 180 is also used to detect whether the oil temperature is too low. According to the structural principle of the clutch of the clutch transfer case 200, when the first solenoid valve is energized, hydraulic oil enters the engagement oil port 210, and the second solenoid valve is not energized and operates, and the hydraulic oil returns through an oil outlet of the second solenoid valve. At this time, the clutch of the clutch transfer case 200 drives the transfer case to be engaged with the engine 300. When the second solenoid valve is energized, hydraulic oil enters the disengagement oil port 220, and the first solenoid valve is not energized and operates, and the hydraulic oil returns through an oil outlet of the first solenoid valve. At this time, the clutch of the clutch transfer case 200 drives the transfer case to be separated from the engine 300.

[0084] In this embodiment, as Figure 3 shown, at least a part of the clutch of the clutch transfer case 200 extends into the transfer case, and at least a part of the oil supply pipeline 130 is arranged in the transfer case. The hydraulic control system 100 for the clutch transfer case is used to control the separation or engagement between the transfer case and the engine 300.

[0085] In this embodiment, the clutch of the clutch transfer case 200 is integrated with the transfer case, which simplifies the structures of the transfer case and the clutch, saves costs, and is more conducive to controlling the separation or engagement between the transfer case and the engine 300. At least a part of the oil supply pipeline 130 is arranged in the transfer case, and the pressurized oil with oil pressure in the transfer case can be used as the oil source 110, which saves the structural setting of the oil source 110 and further increases the integration between the hydraulic control system 100 for the clutch transfer case and the transfer case, making the degree of integration higher.

[0086] In an embodiment of the present invention, the pressure oil output through the oil supply pipeline 130 reaches the control valve device 120 after being filtered by the filter 170. The overflow valve 194 keeps the inlet pressure of the control valve device 120 at 25 bar, which can of course be adjusted according to actual requirements. The pressure reducing valve 192 maintains the inlet pressure of the first solenoid valve and the second solenoid valve at 20 bar, and can also be adjusted according to the pressure requirements of the clutch of the clutch transfer case 200. By controlling the on-off of the first solenoid valve and the second solenoid valve, the clutch of the clutch transfer case 200 can achieve the engagement and disengagement functions. The oil outlet of the overflow valve 194 can be connected to multiple throttling points and then to each lubricating part 230 of the clutch transfer case 200, so as to achieve good lubrication between the moving parts of the clutch transfer case 200.

[0087] By integrating the clutch of the clutch transfer case 200 with the transfer case, the structure of the transfer case and the clutch is simplified, the cost is saved, and it is easier to control the separation or engagement between the transfer case and the engine 300. At least a part of the oil supply pipeline 130 is arranged inside the clutch transfer case 200, and the pressure oil with oil pressure inside the clutch transfer case 200 is used as the oil source 110, which further saves the structural setting of the oil source 110 and further increases the integration between the hydraulic control system 100 for the clutch transfer case and the clutch transfer case 200, making the degree of integration higher. Especially in the application of the hybrid power system, the problem of the engine 300 driving multiple power elements is solved.

[0088] In summary, the beneficial effects of the embodiment according to the present invention are as follows:

[0089] 1. The control of the clutch of the clutch transfer case 200 and the lubrication of the clutch transfer case 200 are realized through the same oil supply pipeline 130, which simplifies the design structure.

[0090] 2. By arranging the throttle valve 150 on the lubricating oil pipeline 140, it is possible to avoid the gear burning in the clutch transfer case 200 caused by too little lubricating oil, and it is also possible to avoid the large energy loss during the operation of the gears in the clutch transfer case 200 caused by too much lubricating oil.

[0091] In the embodiment according to the present invention, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "multiple" means two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiment according to the present invention can be understood according to specific circumstances.

[0092] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and for simplification of the description, rather than indicating or implying that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present invention.

[0093] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] The above are only the preferred embodiments of the embodiments of the present invention and are not used to limit the embodiments of the present invention. For those skilled in the art, various changes and modifications can be made to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included within the protection scope of the embodiments of the present invention.

Claims

1. A hydraulic control system for a clutch transfer case, characterized in that, Comprising: A clutch oil circuit, which is connected to the inside of the clutch transfer case and is used to realize the clutch of the clutch transfer case; A lubricating oil circuit, which is connected to the clutch oil circuit, and the lubricating oil circuit is connected to the inside of the clutch transfer case and is used to lubricate the clutch transfer case; An oil supply pipeline, which is connected to the clutch oil circuit to supply oil to the clutch oil circuit and the lubricating oil circuit; A control valve device, which is arranged on the clutch oil circuit; Wherein, the clutch transfer case includes a joint oil port and a separation oil port, and the control valve device is respectively connected to the joint oil port and the separation oil port; A pressure maintaining valve group, which is used to control the oil pressure entering the control valve device and / or the lubricating oil circuit; The pressure maintaining valve group is arranged on the clutch oil circuit, and the pressure maintaining valve group includes: A relief valve, which is connected to the clutch oil circuit; Wherein, the lubricating oil circuit is connected to the relief valve, and there are multiple lubricating parts inside the clutch transfer case, and the lubricating oil circuit is connected to the lubricating parts; The hydraulic control system for the clutch transfer case further includes: A throttle valve, the lubricating oil circuit includes multiple lubricating branches, and at least one throttle valve is respectively arranged on each lubricating branch; and / or A filter, which is arranged on the oil supply pipeline; The control valve device includes: A first control valve, which is used to control the supply of oil from the clutch oil circuit to the joint oil port; A second control valve, which is used to control the supply of oil from the clutch oil circuit to the separation oil port; The control valve device includes: A reversing valve, which has a first working port, a second working port, an oil inlet and an oil return port. The oil inlet is connected to the oil supply pipeline through the clutch oil circuit, the oil return port is used for oil return, the first working port is connected to the joint oil port, and the second working port is connected to the separation oil port; Wherein, in the first working state of the reversing valve, the first working port is connected to the oil inlet, and the second working port is connected to the oil return port; in the second working state of the reversing valve, the first working port is connected to the oil return port, and the second working port is connected to the oil inlet.

2. The hydraulic control system for a clutch transfer case according to claim 1, wherein, The pressure maintaining valve group further includes: A pressure reducing valve, which has a first port, a second port and a third port. The first port is connected to the oil supply pipeline through the clutch oil circuit, the second port is connected to the control valve device, and the third port is used for oil return; A pressure detection device, which is connected to the oil circuit between the pressure reducing valve and the control valve device, and the pressure detection device is used to detect the outlet oil pressure of the pressure reducing valve.

3. The hydraulic control system for a clutch transfer case according to claim 1 or 2, characterized in that, Further including: An oil pump, which is connected to a fuel tank; A power device, which is connected to the oil pump; Wherein, the oil pump is arranged on the oil supply pipeline.

4. An engineering mechanical equipment, characterized in that, Comprising: An engine; A clutch transfer case; The hydraulic control system for the clutch transfer case according to any one of claims 1 to 3; Among them, the input end of the clutch transfer case is connected to the engine, and the hydraulic control system for the clutch transfer case is used to control the mutual engagement or mutual separation between the input end and the output end of the clutch transfer case.

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