Steering and braking hydraulic system and walking machine

Abstract

The utility model belongs to the technical field of walking mechanical equipment, and particularly relates to a steering and braking hydraulic system and a walking machine.The steering and braking hydraulic system comprises a one-way stable flow divider valve, a braking unit and a steering unit, the one-way stable diverter valve is arranged on the pumping oil way and comprises a diverter valve oil inlet, a first diverter valve oil outlet and a second diverter valve oil outlet; the brake unit is arranged on a brake oil outlet path connected with an oil outlet of the first flow divider valve; the steering unit is arranged on a steering oil outlet way connected with an oil outlet of the second flow dividing valve, and the steering oil outlet way and the braking oil outlet way are arranged in parallel. In the application, the braking unit and the steering unit are connected with the same pumping oil path by adopting the one-way stable diverter valve, so that the braking unit and the steering unit share the same hydraulic oil source, and the same hydraulic oil source can be used for the braking unit and the steering unit to realize corresponding functions at the same time; and the number of hydraulic elements of the steering and braking hydraulic system is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of walking mechanical equipment, and particularly relates to a steering and braking hydraulic system and a walking machine. Background Art

[0002] Walking machines have multiple hydraulic systems, which can be classified into a braking hydraulic system, a steering hydraulic system, a working hydraulic system, etc. according to their functions. The steering hydraulic system and the braking hydraulic system require less power, and both adopt an intermittent working mode. However, for safety reasons, the supply of hydraulic oil to these two systems needs to be ensured first.

[0003] In the prior art, multiple hydraulic oil sources are used to supply hydraulic oil to the braking hydraulic system and the steering hydraulic system respectively. In view of the above related technologies, multiple hydraulic oil sources and multiple hydraulic oil pipelines will increase the number of hydraulic components on the walking machine. Utility Model Content

[0004] The purpose of this application is to provide a steering and braking hydraulic system and a walking machine, aiming to reduce the number of hydraulic components on the walking machine.

[0005] To achieve the above purpose, on the one hand, this application provides a steering and braking hydraulic system, including:

[0006] A single-way stable flow-dividing valve, which is arranged on the pumping oil circuit and includes a flow-dividing valve inlet, a first flow-dividing valve outlet and a second flow-dividing valve outlet. The flow-dividing valve inlet is connected to the pumping oil port of a hydraulic pump arranged on the pumping oil circuit;

[0007] A braking unit, which is arranged on the braking oil outlet circuit connected to the first flow-dividing valve outlet;

[0008] A steering unit, which is arranged on the steering oil outlet circuit connected to the second flow-dividing valve outlet. The steering oil outlet circuit and the braking oil outlet circuit are arranged in parallel via the single-way stable flow-dividing valve.

[0009] In some embodiments, the pumping oil circuit only includes one hydraulic pump, and the hydraulic pump is a fixed-displacement pump.

[0010] In some embodiments, the steering and braking hydraulic system further includes an accumulator and an accumulator oil circuit connecting the accumulator and the braking oil outlet circuit. The connection point of the accumulator oil circuit and the braking oil outlet circuit is located on the upstream side of the braking unit.

[0011] In some embodiments, the steering and braking hydraulic system further includes a charging valve group arranged on the braking oil outlet circuit. The charging valve group is arranged on the upstream side of the connection point of the accumulator oil circuit and the braking oil outlet circuit.

[0012] In some embodiments, the liquid filling valve group includes:

[0013] A first hydraulically controlled directional valve, which is arranged on a first oil return line connected to the brake oil outlet line;

[0014] A second hydraulically controlled directional valve, a first oil port of the second hydraulically controlled directional valve is connected with a liquid filling oil line, the liquid filling oil line is used for connecting with the brake oil outlet line, a second oil port of the second hydraulically controlled directional valve is connected with a first pilot oil line, the first pilot oil line is used for connecting with the hydraulic control end of the first hydraulically controlled directional valve, a third oil port of the second hydraulically controlled directional valve is connected with a second oil return line, the hydraulic control end of the second hydraulically controlled directional valve is connected with a second pilot oil line, and the second pilot oil line is used for connecting with the energy storage oil line;

[0015] Wherein, a connection point between the first oil return line and the brake oil outlet line is located on the upstream side of a connection point between the liquid filling oil line and the brake oil outlet line.

[0016] In some embodiments, the liquid filling valve group further includes:

[0017] A first throttle valve arranged on the brake oil outlet line, an oil inlet end of the first throttle valve is arranged on the downstream side of a connection point between the first oil return line and the brake oil outlet line, and an oil outlet end of the first throttle valve is arranged on the upstream side of a connection point between the liquid filling oil line and the brake oil outlet line;

[0018] A check valve arranged on the brake oil outlet line, an oil inlet end of the check valve is arranged on the downstream side of a connection point between the liquid filling oil line and the brake oil outlet line.

[0019] In some embodiments, the steering and braking hydraulic system further includes other actuators and a branch oil line for connecting the other actuators with the first oil return line, and a first electromagnetic directional valve for controlling the on-off of the branch oil line is arranged on the branch oil line.

[0020] In some embodiments, a second electromagnetic directional valve for controlling the on-off of the first oil return line is arranged on the first oil return line, and the second electromagnetic directional valve is arranged on the downstream side of a connection point between the branch oil line and the first oil return line.

[0021] In some embodiments, the steering and braking hydraulic system further includes a pressure detection component and a detection oil line connecting the pressure detection component with the brake oil outlet line, and a connection point between the detection oil line and the brake oil outlet line is located on the downstream side of the liquid filling valve group and on the upstream side of the braking unit.

[0022] The second aspect of the present application provides a construction machine, which includes a steering and braking hydraulic system.

[0023] Through the above technical solutions, the steering and braking hydraulic system and the mobile machinery provided by this application have the following beneficial effects:

[0024] The braking unit is used to implement the braking function of the mobile machinery, and the steering unit is used to implement the steering function of the mobile machinery. Both the braking unit and the steering unit are hydraulically driven. The pumping oil circuit and the hydraulic pump are used to deliver hydraulic oil to the steering unit and the braking unit to drive the braking unit and the steering unit to implement the corresponding functions. In this application, by setting a single-way stable flow divider valve, the braking unit and the steering unit are connected to the same pumping oil circuit, so that the braking unit and the steering unit share the same hydraulic oil source, thereby reducing the number of hydraulic components on the mobile machinery.

[0025] Other features and advantages of the embodiments of this application will be described in detail in the subsequent specific embodiments section. Description of the Drawings

[0026] The drawings are used to provide a further understanding of the embodiments of this application, and constitute a part of the specification. They are used together with the following specific embodiments to explain the embodiments of this application, but do not constitute a limitation to the embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts. In the drawings:

[0027] Figure 1 is the hydraulic schematic diagram of the steering and braking hydraulic system in a specific embodiment according to this application;

[0028] Figure 2 is the hydraulic schematic diagram of the single-way stable flow divider valve in a specific embodiment according to this application;

[0029] Figure 3 is the hydraulic schematic diagram of the fluid filling valve group in a specific embodiment according to this application.

[0030] Description of the Reference Numerals

[0031] 100. Steering and braking hydraulic system; 1. Single-way stable flow dividing valve; 2. Pumping oil circuit; 3. Liquid filling valve group; 31. First hydraulic control reversing valve; 32. Second hydraulic control reversing valve; 33. Check valve; 34. First throttle valve; 4. Hydraulic pump; 5. Braking unit; 6. Braking oil outlet oil circuit; 7. Steering unit; 8. Steering oil outlet oil circuit; 9. Accumulator; 10. Accumulating oil circuit; 11. First oil return oil circuit; 12. Liquid filling oil circuit; 13. First pilot oil circuit; 14. Second oil return oil circuit; 15. Second pilot oil circuit; 16. Other actuators; 17. Branch oil circuit; 18. First electromagnetic reversing valve; 19. Second electromagnetic reversing valve; 20. Pressure detection component; 21. Detection oil circuit; 22. Third oil return oil circuit; 23. Prime mover; a. First oil port; b. Second oil port; c. Third oil port; P. Inlet port of the flow dividing valve; B. Outlet port of the first flow dividing valve; A. Outlet port of the second flow dividing valve; T. Outlet port of the third flow dividing valve. Detailed implementation manners

[0032] The following will describe in detail the detailed implementation manners of the present application with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only for explaining and illustrating the present application, and are not used to limit the present application.

[0033] The following describes the steering and braking hydraulic system 100 according to the present application and the part of the terms of the construction machinery with reference to the accompanying drawings.

[0034] As Figure 1 and Figure 2 shown, a specific embodiment of the present application provides a steering and braking hydraulic system 100, which includes a single-way stable flow dividing valve 1, a braking unit 5 and a steering unit 7. Among them, the single-way stable flow dividing valve 1 is arranged on the pumping oil circuit 2 and includes an inlet port P of the flow dividing valve, an outlet port B of the first flow dividing valve and an outlet port A of the second flow dividing valve. The inlet port P of the flow dividing valve is connected to the pumping oil port of a hydraulic pump 4 arranged on the pumping oil circuit 2; the braking unit 5 is arranged on a braking oil outlet oil circuit 6 connected to the outlet port B of the first flow dividing valve; the steering unit 7 is arranged on a steering oil outlet oil circuit 8 connected to the outlet port A of the second flow dividing valve. The steering oil outlet oil circuit 8 and the braking oil outlet oil circuit 6 are arranged in parallel through the single-way stable flow dividing valve 1.

[0035] On the construction machinery, both the braking unit 5 and the steering unit 7 are hydraulically driven. In other words, both the braking unit 5 and the steering unit 7 need to be connected to a hydraulic oil source. In the present application, the single-way stable flow dividing valve 1 is used to connect the braking unit 5 and the steering unit 7 to the same pumping oil circuit 2, so as to realize the sharing of the same hydraulic oil source by the braking unit 5 and the steering unit 7, so that the same hydraulic oil source can supply the braking unit 5 and the steering unit 7 to realize the corresponding functions at the same time, thereby reducing the number of hydraulic components of the steering and braking hydraulic system 100.

[0036] Especially for some smaller mobile machinery or mobile machinery with limited installation space for the hydraulic system, the number of hydraulic components in the steering and braking hydraulic system 100 cannot be too large.

[0037] It should be noted that the single-way stable flow-dividing valve 1 can ensure that the oil output from the oil outlet A of the second flow-dividing valve always maintains a stable value. Since the steering ability of the steering unit 7 remains unchanged all the time, a constant oil supply pressure is required. Generally, a load-sensing variable pump is added to the pumping oil circuit 2 to ensure that the oil supply pressure of the steering unit 7 always remains stable. However, the installation space required for installing the load-sensing variable pump is large and the cost is high. In this application, the single-way stable flow-dividing valve 1 is used to replace the load-sensing variable pump. In other words, the pumping oil circuit 2 of the steering and braking hydraulic system 100 only includes a hydraulic pump 4. It can be seen that on the premise of ensuring that the oil supply pressure of the steering unit 7 always remains stable, the installation space required for the steering and braking hydraulic system 100 is reduced and the product cost is lowered.

[0038] Among them, the hydraulic pump 4 on the pumping oil circuit 2 is a fixed-displacement pump. A fixed-displacement pump is a kind of hydraulic pump 4 in which the volume of hydraulic oil discharged (i.e., the hydraulic oil flow rate) is fixed when the pump shaft rotates one week. The fixed-displacement pump is controllably connected to the prime mover 23 of the mobile machinery, and the prime mover 23 can adjust the rotational speed of the pump shaft of the fixed-displacement pump.

[0039] Those skilled in the art can understand that the structure and principle of the fixed-displacement pump and the adjustment principle of the prime mover 23 to the fixed-displacement pump are well known to those skilled in the art and do not belong to the core improvement part of this application, so they will not be elaborated here. It should be noted that the prime mover 23 can be an electric motor or an engine, corresponding to new energy mobile machinery and traditional mobile machinery respectively.

[0040] Specifically, the oil inlet P of the flow-dividing valve of the single-way stable flow-dividing valve 1 is connected to the oil outlet end of the pumping oil circuit 2. The first oil outlet B of the single-way stable flow-dividing valve 1 is connected to the oil inlet end of the braking oil outlet circuit 6. The second oil outlet A of the single-way stable flow-dividing valve 1 is connected to the oil inlet end of the steering oil outlet circuit 8. The single-way stable flow-dividing valve 1 further includes a third oil outlet T of the flow-dividing valve, and the third oil outlet T of the flow-dividing valve is connected to a third oil return circuit 22. The second oil outlet A of the single-way stable flow-dividing valve 1 is always connected to the oil inlet end of the steering oil circuit. The hydraulic oil flow rate of the second oil outlet A of the single-way stable flow-dividing valve 1 is set to a preset stable value according to the hydraulic oil flow rate required by the steering unit 7. After the hydraulic oil flow rate of the second oil outlet A reaches the preset stable value, the first oil outlet B is connected to the oil inlet end of the braking oil outlet circuit 6 to supply oil to the braking unit 5. When the hydraulic oil flow rate of the second oil outlet A exceeds the preset stable value, the third oil outlet T is connected to the oil inlet end of the third oil return circuit 22 to discharge the excess hydraulic oil, so as to maintain the hydraulic oil flow rate of the second oil outlet at the preset stable value.

[0041] In some embodiments, the steering and braking hydraulic system 100 further includes an accumulator 9 and an accumulator oil circuit 10 connecting the accumulator 9 and the braking oil outlet oil circuit 6. The connection point of the accumulator oil circuit 10 and the braking oil outlet oil circuit 6 is located on the upstream side of the braking unit 5.

[0042] The accumulator 9 is a hydraulic component for storing energy. Specifically, when the braking oil outlet oil circuit 6 can supply sufficient hydraulic oil to the braking unit 5, the accumulator 9 introduces part of the hydraulic oil through the accumulator oil circuit 10 and converts the hydraulic energy into compression energy or potential energy for storage to increase the pressure value of the accumulator 9; when the braking oil outlet oil circuit 6 cannot supply sufficient hydraulic oil to the braking unit 5 and the braking unit 5 needs to perform the braking function, the accumulator 9 can convert the compression energy or potential energy into hydraulic energy and introduce it into the braking oil outlet oil circuit 6 through the accumulator oil circuit 10. At this time, the pressure value of the accumulator 9 decreases, so as to provide sufficient hydraulic oil pressure for the braking unit 5 to enable the braking unit 5 to perform the braking function.

[0043] Therefore, adding the accumulator 9 to the steering and braking hydraulic system 100 can ensure that sufficient hydraulic oil is provided for the braking unit 5 in an emergency, thereby improving the reliability of the steering and braking hydraulic system 100, and further improving the safety of the construction machinery to reduce the occurrence of safety accidents.

[0044] In some embodiments, the steering and braking hydraulic system 100 further includes a filling valve group 3 provided on the braking oil outlet oil circuit 6. The filling valve group 3 is provided on the upstream side of the connection point of the accumulator oil circuit 10 and the braking oil outlet oil circuit 6.

[0045] The function of the filling valve group 3 is to adjust the hydraulic oil flow rate flowing into the accumulator oil circuit 10 according to the pressure value of the accumulator 9. The pressure value of the accumulator 9 includes a lower pressure limit value and an upper pressure limit value. In other words, when the pressure value of the accumulator oil circuit 10 is lower than the lower pressure limit value, the hydraulic oil flow rate flowing from the braking oil outlet oil circuit 6 into the accumulator oil circuit 10 through the filling valve group 3 is the largest. As the pressure value of the accumulator 9 increases, the hydraulic oil flow rate flowing from the braking oil outlet oil circuit 6 into the accumulator oil circuit 10 through the filling valve group 3 gradually decreases until the pressure value of the accumulator 9 reaches the upper pressure limit value. Subsequently, the hydraulic oil flow rate flowing from the braking oil outlet oil circuit 6 into the accumulator oil circuit 10 through the filling valve group 3 tends to be stable to maintain the pressure value of the accumulator 9 and provide hydraulic oil with a stable flow rate for the braking unit 5.

[0046] It can be seen that the filling valve group 3 can achieve priority filling of the accumulator 9 to ensure the function of the accumulator 9, and at the same time supply hydraulic oil with a stable flow rate for the braking unit 5, thereby improving the reliability of the steering and braking hydraulic system 100, and further improving the safety of the construction machinery to reduce the occurrence of safety accidents.

[0047] Such asFigure 3 As shown, in an exemplary embodiment of the present application, the liquid filling valve group 3 includes a first hydraulic control reversing valve 31, a second hydraulic control reversing valve 32, a first throttle valve 34, and a check valve 33.

[0048] It should be noted that the first throttle valve 34 is used to keep the hydraulic oil flow rate of the brake oil outlet oil circuit 6 stable; the check valve 33 is used to prevent the hydraulic oil from flowing back. As for the structures and principles of the first throttle valve 34 and the check valve 33, they are well-known to those skilled in the art and do not belong to the core improvement part of the present application, so they will not be elaborated here.

[0049] Specifically, the brake oil outlet oil circuit 6 is connected to a first oil return oil circuit 11. The first hydraulic control reversing valve 31 is arranged on the first oil return oil circuit 11, and the first hydraulic control reversing valve 31 can control the on-off of the first oil return oil circuit 11. The first oil port a of the second hydraulic control reversing valve 32 is connected to a liquid filling oil circuit 12 to be connected to the brake oil outlet oil circuit 6. The second oil port b of the second hydraulic control reversing valve 32 is connected to a first pilot oil circuit 13 to be connected to the hydraulic control end of the first hydraulic control reversing valve 31. The third oil port c of the second hydraulic control reversing valve 32 is connected to a second oil return oil circuit 14. A second pilot oil circuit 15 is provided at the hydraulic control end of the second hydraulic control reversing valve 32 and is connected to the energy storage oil circuit 10.

[0050] Furthermore, the connection point of the first oil return oil circuit 11 and the brake oil outlet oil circuit 6, the first throttle valve 34, the connection point of the liquid filling oil circuit 12 and the brake oil outlet oil circuit 6, and the check valve 33 are arranged on the brake oil outlet oil circuit 6 in sequence from the upstream side to the downstream side. Among them, the connection of the second pilot oil circuit 15 and the energy storage oil circuit 10, the upstream side refers to the side relatively close to the fixed displacement pump along the brake oil outlet oil circuit 6, and the downstream side refers to the side relatively close to the brake unit 5 along the brake oil outlet oil circuit 6.

[0051] Moreover, the second pilot oil circuit 15 and the energy storage oil circuit 10 are indirectly connected. In other words, the second pilot oil circuit 15 is connected to the brake oil outlet oil circuit 6, but the connection point of the second pilot oil circuit 15 and the brake oil outlet oil circuit 6 is located on the downstream side of the check valve 33. It can be seen that the pressure value of the accumulator 9 is made the same as the pressure value of the driving end of the second hydraulic control reversing valve 32 through the second pilot oil circuit 15.

[0052] Preferably, the second hydraulic control reversing valve 32 is a two-position three-way reversing valve and adopts a hydraulic drive for position change.

[0053] Specifically, the second hydraulic control reversing valve 32 includes a left working position and a right working position. When the second hydraulic control reversing valve 32 is in the left working position, the liquid filling oil circuit 12 is disconnected from the first pilot oil circuit 13, and the first pilot oil circuit 13 is communicated with the second oil return oil circuit 14; when the second hydraulic control reversing valve 32 is in the right working position, the liquid filling oil circuit 12 is communicated with the first pilot oil circuit 13, and the first pilot oil circuit 13 is disconnected from the second oil return oil circuit 14.

[0054] Further, the switching between the left working position and the right working position of the second hydraulic control reversing valve 32 is achieved by supplying oil to the hydraulic control end of the second hydraulic control reversing valve 32 through the first pilot oil circuit 13. It is necessary to preset the connection pressure value and the disconnection pressure value for the hydraulic control end of the second hydraulic control reversing valve 32. When the hydraulic control end of the second hydraulic control reversing valve 32 reaches the connection pressure value, the second hydraulic control reversing valve 32 switches from the right working position to the left working position. When the hydraulic control end of the second hydraulic control reversing valve 32 reaches the disconnection pressure value, the second hydraulic control reversing valve 32 switches from the right working position to the left working position.

[0055] Among them, the connection pressure value of the second hydraulic control reversing valve 32 is equal to the upper limit pressure value of the accumulator 9. In other words, when the pressure value of the accumulator 9 rises to the upper limit pressure value, the second hydraulic control reversing valve 32 switches from the right working position to the left working position; the disconnection pressure value of the second hydraulic control reversing valve 32 is equal to the lower limit pressure value of the accumulator 9. In other words, when the pressure value of the accumulator 9 drops to the lower limit pressure value, the second hydraulic control reversing valve 32 switches from the left working position to the left working position.

[0056] Preferably, the first hydraulic control reversing valve 31 is a two-position two-way reversing valve and adopts a hydraulic actuated position change method.

[0057] Specifically, the first hydraulic control reversing valve 31 includes a left working position and a right working position. When the first hydraulic control reversing valve 31 is in the left working position, the first oil return circuit 11 is disconnected; when the first hydraulic control reversing valve 31 is in the right working position, the first oil return circuit 11 is connected.

[0058] Further, the switching between the left working position and the right working position of the first hydraulic control reversing valve 31 is achieved by supplying oil to the hydraulic control end of the first hydraulic control reversing valve 31 through the first pilot oil circuit 13. It is necessary to preset the position change pressure value for the hydraulic control end of the first hydraulic control reversing valve 31. Only when the hydraulic control end of the first hydraulic control reversing valve 31 reaches the corresponding position change pressure value can the working position switching be completed. When the hydraulic control end of the first hydraulic control reversing valve 31 does not reach the position change pressure value, the first hydraulic control reversing valve 31 is in the left working position; when the hydraulic control end of the first hydraulic control reversing valve 31 reaches the position change pressure value, the first hydraulic control reversing valve 31 is in the right working position. The position change pressure value of the first hydraulic control reversing valve 31 is slightly greater than the atmospheric pressure. In other words, the hydraulic oil flowing through the first pilot oil circuit 13 to the hydraulic control end of the first hydraulic control reversing valve 31 can reach the position change pressure value. It can be seen that when the second hydraulic control reversing valve 32 is in the right working position, the first hydraulic control reversing valve 31 is in the left working position.

[0059] In the exemplary embodiment of the present application, the working principle of the filling valve group 3 is as follows:

[0060] When the pressure value of the accumulator 9 drops to the lower limit value of the pressure, the second hydraulic control directional valve 32 switches from the left working position to the right working position. Part of the hydraulic oil in the brake oil outlet oil circuit 6 flows through the filling oil circuit 12 and the first pilot oil circuit 13 to the hydraulic control end of the first hydraulic control directional valve 31 to make the first hydraulic control directional valve 31 in the left working position, and another part of the hydraulic oil flows through the first throttle valve 34 and the one-way valve 33 to the energy storage oil circuit 10 to fill the accumulator 9; when the pressure value of the accumulator 9 rises to the upper limit value of the pressure, the second hydraulic control directional valve 32 switches from the right working position to the left working position, and the hydraulic control end of the first hydraulic control directional valve 31 is communicated with the second oil return oil circuit 14 to make the hydraulic oil at the hydraulic control end of the first hydraulic control directional valve 31 flow back to the hydraulic oil tank, so that the first hydraulic control directional valve 31 switches from the left working position to the right working position, and the hydraulic oil in the brake oil outlet oil circuit 6 flows back to the hydraulic oil tank through the first oil return oil circuit 11. At this time, the one-way valve 33 is disconnected to prevent the hydraulic oil in the energy storage oil circuit 10 from flowing back.

[0061] In the present application, the automation of the charging process of the accumulator 9 is realized through the first hydraulic control directional valve 31, the second hydraulic control directional valve 32, the one-way valve 33 and the first throttle valve 34, and no electricity is required.

[0062] Preferably, the steering and braking hydraulic system 100 further includes a pressure detection member 20 and a detection oil circuit 21 connecting the pressure detection member 20 and the brake oil outlet oil circuit 6. The connection point of the detection oil circuit 21 and the brake oil outlet oil circuit 6 is located on the downstream side of the filling valve group 3 and on the upstream side of the brake unit 5.

[0063] Specifically, the detection oil circuit 21 is communicated with the energy storage oil circuit 10, and the pressure detection member 20 is used to detect the pressure value of the energy storage oil circuit 10. Once the pressure value of the energy storage oil circuit 10 is lower than the lower limit value of the pressure and lasts for a preset time, the pressure detection member 20 will issue a reminder to inform the operator that the steering and braking hydraulic system 100 has a fault, thereby improving the reliability of the steering and braking hydraulic system 100.

[0064] In some embodiments, the steering and braking hydraulic system 100 further includes other actuators 16 and a branch oil circuit 17 connecting the other actuators 16 and the first oil return oil circuit 11. A first electromagnetic directional valve 18 for controlling the on / off of the branch oil circuit 17 is provided on the branch oil circuit 17.

[0065] It should be noted that the other actuators 16 are determined according to the functions of the mobile machinery. For example, if the mobile machinery is an excavator, the other actuator 16 is the boom drive oil cylinder; if the mobile machinery is a crane, the other actuator 16 is the boom luffing oil cylinder. In this application, by integrally arranging the hydraulic system of the other actuator 16 with the steering and braking hydraulic system 100, in other words, the other actuator 16, the steering unit 7, and the braking unit 5 share the same hydraulic oil source. It can be seen that the number of hydraulic components on the mobile machinery is further reduced.

[0066] Specifically, when the other actuator 16 needs to perform an action, the first electromagnetic directional valve 18 connects the bypass oil circuit 17 so that the hydraulic oil flows to the other actuator 16 through the bypass oil circuit 17, thereby realizing the hydraulic drive of the other actuator 16; when the other actuator 16 does not need to perform an action, the first electromagnetic directional valve 18 disconnects the bypass oil circuit 17 so that the hydraulic oil flows back to the hydraulic oil tank through the first oil return circuit 11.

[0067] Furthermore, a second electromagnetic directional valve 19 for controlling the on-off of the first oil return circuit 11 is provided on the first oil return circuit 11. The second electromagnetic directional valve 19 is arranged on the downstream side of the connection point between the bypass oil circuit 17 and the first oil return circuit 11. When the other actuator 16 needs to perform an action, the first electromagnetic directional valve 18 connects the bypass oil circuit 17 and the second electromagnetic directional valve 19 disconnects the connection between the first oil return circuit 11 and the hydraulic oil tank, so that all the hydraulic oil flows to the other actuator 16; when the other actuator 16 does not need to perform an action, the first electromagnetic directional valve 18 disconnects the bypass oil circuit 17 and the second electromagnetic directional valve 19 connects the first oil return circuit 11 and the hydraulic oil tank, so that all the hydraulic oil flows back to the hydraulic oil tank.

[0068] However, only when the pressure value of the accumulator 9 reaches the upper limit of the pressure and no liquid filling is required, the hydraulic oil flows from the brake oil outlet circuit 6 to the first oil return circuit 11 to flow back to the hydraulic oil tank or drive the other actuator 16 to perform an action. In other words, the steering and braking hydraulic system 100 gives priority to ensuring that the braking unit 5 realizes the braking function. It can be seen that the steering and braking hydraulic system 100 has high reliability.

[0069] Preferably, the first hydraulic control directional valve 31 adds a middle working position. When the first hydraulic control directional valve 31 is in the middle working position, the first oil return circuit 11 is connected and a second throttle valve is added on the first oil return circuit 11 to control the flow rate of the brake oil outlet circuit 6 flowing to the first oil return circuit 11, so as to avoid damage to the other actuator 16 caused by excessive flow rate.

[0070] Specifically, when other actuators 16 need to perform actions and the hydraulic control end of the first hydraulic control reversing valve 31 reaches the reversing pressure value, the first hydraulic control reversing valve 31 is in the middle working position; when other actuators 16 do not need to perform actions and the hydraulic control end of the first hydraulic control reversing valve 31 reaches the reversing pressure value, the first hydraulic control reversing valve 31 is in the right working position.

[0071] A specific embodiment of the present application further provides a mobile machine, including a steering and braking hydraulic system 100. Since the mobile machine adopts all embodiments of the steering and braking hydraulic system 100, the mobile machine has all the beneficial effects brought by the steering and braking hydraulic system 100. The mobile machine can be an excavator, a crane, an aerial work platform, etc.

[0072] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0073] In the present application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0074] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0075] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A steering and braking hydraulic system, characterized in that: include: A single-channel stable diverter valve (1) is arranged on a pumping oil circuit (2) and comprises a diverter valve oil inlet (P), a first diverter valve oil outlet (B) and a second diverter valve oil outlet (A), wherein the diverter valve oil inlet (P) is connected to a pumping oil port of a hydraulic pump (4) arranged on the pumping oil circuit (2); A brake unit (5) is arranged on a brake oil outlet passage (6) connected to the oil outlet (B) of the first diverter valve; The steering unit (7) is arranged on a steering oil outlet circuit (8) connected to the oil outlet port (A) of the second diverter valve, and the steering oil outlet circuit (8) and the brake oil outlet circuit (6) are arranged in parallel via the single-way stable diverter valve (1).

2. The steering and braking hydraulic system according to claim 1, characterized in that: The pumping oil circuit (2) comprises only one hydraulic pump (4), and the hydraulic pump (4) is a fixed-displacement pump.

3. The steering and braking hydraulic system according to claim 1, characterized in that: The steering and braking hydraulic system (100) further comprises an accumulator (9) and an energy storage oil circuit (10) connecting the accumulator (9) and the brake oil outlet circuit (6); the connection point between the energy storage oil circuit (10) and the brake oil outlet circuit (6) is located on the upstream side of the brake unit (5).

4. The steering and braking hydraulic system according to claim 3, characterized in that: The steering and braking hydraulic system (100) further comprises a filling valve group (3) arranged on the brake oil outlet circuit (6), wherein the filling valve group (3) is arranged on the upstream side of the connection point between the energy storage circuit (10) and the brake oil outlet circuit (6).

5. The steering and braking hydraulic system according to claim 4, characterized in that: The liquid filling valve group (3) comprises: A first hydraulically controlled reversing valve (31) is arranged on a first oil return line (11) connected to the brake oil outlet line (6); a second hydraulically controlled reversing valve (32), wherein a first oil port (a) of the second hydraulically controlled reversing valve (32) is connected to a filling oil circuit (12), wherein the filling oil circuit (12) is used to be connected to a brake oil outlet oil circuit (6); a second oil port (b) of the second hydraulically controlled reversing valve (32) is connected to a first pilot oil circuit (13), wherein the first pilot oil circuit (13) is used to be connected to a hydraulically controlled end of the first hydraulically controlled reversing valve (31); a third oil port (c) of the second hydraulically controlled reversing valve (32) is connected to a second oil return oil circuit (14); and a hydraulically controlled end of the second hydraulically controlled reversing valve (32) is connected to a second pilot oil circuit (15), wherein the second pilot oil circuit (15) is used to be connected to the energy storage oil circuit (10); The connection point between the first oil return circuit (11) and the brake oil outlet circuit (6) is located on the upstream side of the connection point between the filling circuit (12) and the brake oil outlet circuit (6).

6. The steering and braking hydraulic system according to claim 5, characterized in that: The liquid filling valve group (3) also includes: a first throttle valve (34) disposed on the brake oil outlet circuit (6), wherein an oil inlet end of the first throttle valve (34) is disposed on a downstream side of a connection point between the first oil return circuit (11) and the brake oil outlet circuit (6), and an oil outlet end of the first throttle valve (34) is disposed on an upstream side of a connection point between the filling oil circuit (12) and the brake oil outlet circuit (6); A one-way valve (33) is arranged on the brake oil outlet circuit (6), and an oil inlet end of the one-way valve (33) is arranged on the downstream side of the connection point between the filling oil circuit (12) and the brake oil outlet circuit (6).

7. The steering and braking hydraulic system according to claim 5, characterized in that: The steering and braking hydraulic system (100) further comprises other actuators (16) and a bypass oil circuit (17) for connecting the other actuators (16) and the first oil return oil circuit (11); the bypass oil circuit (17) is provided with a first electromagnetic reversing valve (18) for controlling the on-off of the bypass oil circuit (17).

8. The steering and braking hydraulic system according to claim 7, characterized in that: The first oil return oil circuit (11) is provided with a second electromagnetic reversing valve (19) for controlling the on-off of the first oil return oil circuit (11); the second electromagnetic reversing valve (19) is arranged on the downstream side of the connection point between the bypass oil circuit (17) and the first oil return oil circuit (11).

9. The steering and braking hydraulic system according to claim 4, characterized in that: The steering and brake hydraulic system (100) further comprises a pressure detection component (20) and a detection oil circuit (21) connecting the pressure detection component (20) and the brake oil outlet circuit (6); the connection point between the detection oil circuit (21) and the brake oil outlet circuit (6) is located on the downstream side of the filling valve group (3) and on the upstream side of the brake unit (5).

10. A walking machine, characterized in that: It comprises a steering and braking hydraulic system (100) according to any one of claims 1 to 9.

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