Wheel type hydraulic double-drive control valve with trailer linear walking function

Abstract

The utility model relates to a wheel type hydraulic double-drive control valve with a trailer linear walking function. The technical problem that existing wheel type hydrostatic driving equipment does not have the trailer emergency control function is solved. Comprising a hydraulic parking system and a control valve set, the control valve set is provided with a driving electromagnetic valve, a driving main valve, a variable speed electromagnetic valve, a flow distributing and collecting valve, a throttling valve set, an oil supplementing overflow valve set and an energy accumulator, and an external control pilot port is formed in one side of the driving electromagnetic valve and connected with a driving structure through the driving electromagnetic valve or the variable speed electromagnetic valve; and the driving structure is communicated with the oil inlet / outlet. The driving structure has the advantages that the first motor oil inlet pipeline and the second motor oil inlet pipeline can be communicated with each other in a trailer mode through the driving main valve and the oil inlet and outlet, so that the driving structure can rotate freely, and the trailer effect is guaranteed. The first driving motor set and the second driving motor set can be shunted through the flow distributing and collecting valve, and it is guaranteed that the speed of the driving structure is consistent.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of wheeled mechanical equipment, and particularly relates to a straight-line walking function control valve for a wheeled hydraulic double-drive trailer. BACKGROUND

[0002] At present, with the development of wheeled machinery in recent years, wheeled driving is currently mainly divided into two kinds, one adopts a traditional driving mode same as clutch shifting control of a vehicle gearbox, and the other adopts a hydrostatic driving mode, wherein the wheeled driving of the hydrostatic type can realize functions such as stepless control, double-speed control, steering, flexible braking, overload protection and the like of walking speed, and the existing hydrostatic driving mode gradually replaces the traditional driving mode; however, the existing hydrostatic driving mode cannot perform emergency towing of a faulty vehicle in the case that the pump source or other hydraulic systems or circuit systems are damaged and cannot walk, thereby affecting the use experience of users. SUMMARY

[0003] The utility model aims at the above problems, and provides a straight-line walking function control valve for a wheeled hydraulic double-drive trailer.

[0004] To achieve the above object, the utility model adopts the following technical scheme: the utility model relates to a straight-line walking function control valve for a wheeled hydraulic double-drive trailer, which comprises a hydraulic parking system and a control valve group, wherein the control valve group is provided with a travel electromagnetic valve, a travel main valve, a variable-speed electromagnetic valve, a shunt valve, a throttle valve group, a supplementary oil overflow valve group and an accumulator, one side of the travel electromagnetic valve is provided with an external control pilot port, the external control pilot port is connected with a driving structure through the travel electromagnetic valve or through the variable-speed electromagnetic valve, and the driving structure is connected with an oil inlet and outlet port; when the hydraulic parking system can be normally opened and closed, the hydraulic parking system is provided with oil pressure by the accumulator, so that the equipment can be towed and walked for a long time; and when the hydraulic parking system is faulty, the travel electromagnetic valve is not powered, and the oil inlet and outlet ports of the driving structure are connected with each other, so that the driving structure can be passively rotated when an external equipment is towed, and the driving structure becomes a pump working condition; because the oil inlet and outlet ports of the driving structure are connected with each other, the driving structure can be freely rotated, and the equipment can be towed under the condition that the hydraulic parking system is faulty.

[0005] In the straight-line walking function control valve for a wheeled hydraulic double-drive trailer, the travel electromagnetic valve is a two-position three-way electromagnetic valve, the travel electromagnetic valve is provided with a travel electromagnetic valve oil inlet port, a travel electromagnetic valve oil outlet port and a travel electromagnetic valve oil return port, one end of the travel main valve is provided with a travel main valve oil inlet port, the external control pilot port is connected with the travel electromagnetic valve oil outlet port, and the travel main valve oil inlet port is connected with the travel electromagnetic valve oil return port; when the equipment is in a trailer mode, the external control pilot port is connected with the travel electromagnetic valve oil outlet port, and the travel main valve oil inlet port is connected with the travel electromagnetic valve oil return port.

[0006] In the above-mentioned straight-line walking function control valve for a wheeled hydraulic double-drive trailer, the travel main valve includes a travel main valve closed oil port and a first travel main valve connecting channel arranged at one end of the travel main valve, and a travel main valve oil outlet and a second travel main valve connecting channel arranged at the other end of the travel main valve, the travel main valve oil outlets are arranged in series, and the travel main valve oil outlets are communicated with the second travel main valve connecting channel, when the equipment is in the trailer mode, the oil paths between the travel main valve oil outlets and the driving structure are arranged in series and communicated with each other, the travel main valve oil outlets are communicated with the inlet and outlet oil port through the second travel main valve connecting channel, and the driving structure is communicated with the inlet and outlet oil port, so that the driving structure can rotate freely, the equipment can be towed to walk under the fault condition of the hydraulic parking system, and the service life of the driving structure can be improved.

[0007] In the above-mentioned straight-line walking function control valve for a wheeled hydraulic double-drive trailer, the inlet and outlet oil port has a first inlet and outlet oil port and a second inlet and outlet oil port, the first inlet and outlet oil port is communicated with the travel main valve oil outlet through the second travel main valve connecting channel, and the second inlet and outlet oil port is arranged in parallel with the driving structure, and in the trailer mode, the first inlet and outlet oil port is communicated with the second inlet and outlet oil port through the driving structure, so that the driving structure changes to the working condition of the pump, can rotate freely, improves the service life of the driving structure, and can freely tow to walk, ensuring the trailer effect.

[0008] In the above-mentioned straight-line walking function control valve for a wheeled hydraulic double-drive trailer, the driving structure includes a first driving motor group and a second driving motor group, the first driving motor group and the second driving motor group are connected through a driving bridge, one side of the first driving motor group and the second driving motor group is provided with a unloading assembly arranged in parallel with the unloading pipeline, the other side of the first driving motor group and the second driving motor group is provided with a variable speed assembly arranged in parallel with the variable speed electromagnetic valve, and the first driving motor group and the second driving motor group are provided with a motor inlet and outlet oil assembly arranged in parallel with the second inlet and outlet oil port, the unloading assembly can discharge the pressure oil in the first driving motor group and the second driving motor group, ensuring the service life of the first driving motor group and the second driving motor group, and the motor inlet and outlet oil assembly can communicate the first driving motor group and the second driving motor group with the inlet and outlet oil port for oil inlet and outlet operation.

[0009] In the above-mentioned straight-line walking function control valve for a wheeled hydraulic double-drive trailer, the motor inlet and outlet assembly comprises a first motor inlet and outlet port arranged at one end of the first drive motor group and a second motor inlet and outlet port arranged at one end of the second drive motor group, the first motor inlet and outlet port and the second motor inlet and outlet port are arranged in parallel and are connected to the second inlet and outlet port, the variable speed assembly comprises a first variable oil port arranged at one side of the first motor inlet and outlet port, a second variable oil port is arranged at one side of the second motor inlet and outlet port, the first variable oil port and the second variable oil port are arranged in parallel and are connected to the variable speed electromagnetic valve through a variable oil path, the variable speed electromagnetic valve is a two-position three-way electromagnetic valve, and the variable speed electromagnetic valve has a variable speed electromagnetic valve inlet port, a variable speed electromagnetic valve closed oil port and a variable speed electromagnetic valve return oil port, the first variable oil port and the second variable oil port are connected to the variable speed electromagnetic valve return oil port through the variable oil path.

[0010] In the above-mentioned straight-line walking function control valve for a wheeled hydraulic double-drive trailer, the oil discharge assembly comprises a first oil discharge port arranged at one end of the first drive motor group, a second oil discharge port arranged at one end of the second drive motor group, the first oil discharge port and the second oil discharge port are arranged in parallel and are connected to the oil discharge pipeline, a first motor inlet port connected to the first motor inlet pipeline is arranged at one side of the first oil discharge port, a second motor inlet port connected to the second motor inlet pipeline is arranged at one side of the second oil discharge port, one end of the first motor inlet pipeline and the second motor inlet pipeline is connected to the travel main valve outlet port, the throttle valve group has a first throttle valve and a second throttle valve, the first motor inlet pipeline and the second motor inlet pipeline are connected through the first throttle valve, and the oil supplement overflow valve group is connected to the first motor inlet pipeline and the second motor inlet pipeline.

[0011] In the above-mentioned straight-line walking function control valve for a wheeled hydraulic double-drive trailer, the oil supplement overflow valve group comprises a first oil supplement overflow valve and a second oil supplement overflow valve, a one-way oil supplement valve is arranged in each of the first oil supplement overflow valve and the second oil supplement overflow valve, one side of the first oil supplement overflow valve is connected to the first motor inlet pipeline, one side of the second oil supplement overflow valve is connected to the second motor inlet pipeline, and a oil supplement pipeline connected to the one-way oil supplement valve and connected to the hydraulic parking system is arranged between the first oil supplement overflow valve and the second oil supplement overflow valve.

[0012] In the above-mentioned straight-line walking function control valve for a wheeled hydraulic double-drive trailer, the hydraulic parking system is connected to the external control pilot port through a hydraulic parking pipeline, a parking one-way valve is arranged on the hydraulic parking pipeline, one side of the parking one-way valve is connected to the oil supplement pipeline, and an accumulator and a second throttle valve are arranged on the hydraulic parking pipeline in sequence at the other side of the parking one-way valve.

[0013] In the straight-line walking function control valve for the wheeled hydraulic double-drive trailer, the outer control pilot port is connected with the travel electromagnetic valve inlet, the travel electromagnetic valve inlet is connected with the travel main valve inlet, the first motor inlet pipeline and the second motor inlet pipeline are connected with the travel main valve closed oil port, the first motor inlet pipeline and the second motor inlet pipeline are connected with the first travel main valve connection channel of the travel main valve through the above-mentioned shunt and collecting valve, the shunt and collecting valve is a three-position four-way electromagnetic valve, the shunt and collecting valve includes a shunt and collecting valve closed oil port and a shunt and collecting valve connection channel, and the first motor inlet pipeline and the second motor inlet pipeline are connected with the parallelly arranged shunt and collecting valve connection channels respectively.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] 1. The first motor inlet pipeline and the second motor inlet pipeline can be communicated with each other in the trailer mode through the travel main valve and the inlet and outlet ports, so that the driving structure can rotate freely and the trailer effect is ensured.

[0016] 2. The shunt and collecting valve can shunt the first driving motor group and the second driving motor group respectively in the normal travel state, so that the speeds of the first driving motor group and the second driving motor group are basically consistent, and the first driving motor group and the second driving motor group can be further compensated through the oil supplement overflow valve group and the first throttle valve, so that the vehicle can keep straight in the travel process and the travel stability is ensured.

[0017] 3. The variable speed electromagnetic valve and the variable speed assembly can change the speed of the driving structure, so that the driving structure can download different displacements and torques according to different road conditions and use conditions, the vehicle travel stability is ensured, and the travel experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the hydraulic principle diagram of the utility model embodiment one.

[0019] Figure 2 is the hydraulic principle diagram of the utility model embodiment two.

[0020] Figure 3 is the hydraulic principle diagram of the utility model embodiment three.

[0021] In the figure: hydraulic parking system 1, hydraulic parking pipeline 11, parking check valve 12, control valve group 2, travel solenoid valve 21, travel solenoid valve oil inlet 211, travel solenoid valve oil outlet 212, travel solenoid valve oil return 213, travel main valve 22, travel main valve oil inlet 221, travel main valve oil outlet 222, first travel main valve connecting channel 223, travel main valve oil outlet 224, second travel main valve connecting channel 225, gear solenoid valve 23, gear solenoid valve oil inlet 231, gear solenoid valve oil outlet 232, gear solenoid valve oil return 233, shunt and current valve 24, shunt and current valve oil outlet 241, shunt and current valve connecting channel 242, throttle valve group 25, first throttle valve 251, second throttle valve 252, oil supplement overflow valve group 26, first oil supplement overflow valve 261, second oil supplement overflow valve 262, oil supplement check valve 263, oil supplement pipeline 264, accumulator 27, external control pilot port 3, drive structure 4, first drive motor group 41, first motor oil inlet pipeline 411, first motor oil inlet 412, second drive motor group 42, second motor oil inlet pipeline 421, second motor oil inlet 422, drive axle 43, oil inlet and outlet 5, first oil inlet and outlet 51, second oil inlet and outlet 52, oil discharge assembly 6, oil discharge pipeline 61, first oil discharge port 62, second oil discharge port 63, variable gear assembly 7, first variable oil port 71, second variable oil port 72, variable oil circuit 73, motor oil inlet and outlet assembly 8, first motor oil inlet and outlet 81, second motor oil inlet and outlet 82. DETAILED DESCRIPTION

[0022] The utility model will be made further detailed explanation in combination with the drawings and specific embodiment.

[0023] Embodiment one

[0024] As Figure 1 shown, a kind of for wheeled hydraulic double-drive trailer linear walking function control valve, including hydraulic parking system 1 and control valve group 2, control valve group 2 has travel solenoid valve 21, travel main valve 22, gear solenoid valve 23, shunt and current valve 24, throttle valve group 25, oil supplement overflow valve group 26 and accumulator 27, travel solenoid valve 21 side is equipped with external control pilot port 3, external control pilot port 3 is connected with drive structure 4 by travel solenoid valve 21, drive structure 4 is connected with oil inlet and outlet 5, when hydraulic parking system 1 can normally switch, oil pressure is provided to hydraulic parking system 1 by accumulator 27, equipment can be dragged and walked for a long time, and when hydraulic parking system 1 fails, travel solenoid valve 21 is not allowed electricity, and drive structure 4 import and export oil circuit is interconnected, when external equipment traction is able to make drive structure 4 passive rotation, drive structure 4 becomes the working condition of pump, because drive structure 4 import and export oil circuit is connected, drive structure 4 can rotate freely, equipment can be dragged under the condition of hydraulic parking system 1 failure.

[0025] Specifically, the traveling electromagnetic valve 21 is a two-position three-way electromagnetic valve, and the traveling electromagnetic valve 21 has a traveling electromagnetic valve oil inlet 211, a traveling electromagnetic valve oil closing port 212, and a traveling electromagnetic valve oil return port 213. The traveling main valve 22 has a traveling main valve oil inlet 221 at one end. The external control pilot port 3 is connected to the traveling electromagnetic valve oil closing port 212, and the traveling main valve oil inlet 221 is connected to the traveling electromagnetic valve oil return port 213. When the device is in the trailer mode, the external control pilot port 3 is connected to the traveling electromagnetic valve oil closing port 212, and the traveling main valve oil inlet 221 is connected to the traveling electromagnetic valve oil return port 213.

[0026] The traveling main valve 22 includes a traveling main valve oil closing port 222 and a first traveling main valve connecting channel 223 arranged at one end of the traveling main valve 22. The other end of the traveling main valve 22 is provided with a traveling main valve oil outlet 224 and a second traveling main valve connecting channel 225. The traveling main valve oil outlet 224 is arranged in series, and the traveling main valve oil outlet 224 is connected to the second traveling main valve connecting channel 225. When the device is in the trailer mode, the oil circuit between the traveling main valve oil outlet 224 and the driving structure 4 is arranged in series and connected to each other. The traveling main valve oil outlet 224 is connected to the inlet and outlet port 5 through the second traveling main valve connecting channel 225, and the driving structure 4 is connected to the inlet and outlet port 5. The driving structure 4 can rotate freely, ensuring that the device can be towed and walked in the event of a hydraulic parking system 1 failure, and the service life of the driving structure 4 can be improved.

[0027] As shown in Figure 1 The inlet and outlet port 5 has a first inlet and outlet port 51 and a second inlet and outlet port 52. The first inlet and outlet port 51 is connected to the traveling main valve oil outlet 224 through the second traveling main valve connecting channel 225, and the second inlet and outlet port 52 is connected in parallel with the driving structure 4. In the trailer mode, the first inlet and outlet port 51 is connected to the second inlet and outlet port 52 through the driving structure 4, so that the driving structure 4 becomes a pump working condition and can rotate freely, improving the service life of the driving structure 4 and allowing free towing and walking, ensuring the trailer effect.

[0028] Further, the driving structure 4 comprises a first driving motor group 41 and a second driving motor group 42, the first driving motor group 41 and the second driving motor group 42 are connected through a driving bridge 43, and the first driving motor group 41 and the second driving motor group 42 each have a driving motor, a driving bridge reduction, and a driving wheel, and one side of the first driving motor group 41 and the second driving motor group 42 is provided with a oil discharge assembly 6 which is arranged in parallel with the oil discharge pipeline 61, and the first driving motor group 41 and the second driving motor group 42 are provided with a motor in-out oil assembly 8 which is arranged in parallel with the second in-out oil port 52, the pressure oil in the first driving motor group 41 and the second driving motor group 42 can be discharged through the oil discharge assembly 6, the service life of the first driving motor group 41 and the second driving motor group 42 is guaranteed, and the first driving motor group 41 and the second driving motor group 42 can be communicated with the in-out oil port 5 through the motor in-out oil assembly 8, and the oil in-out operation is performed.

[0029] Among them, the motor in-out oil assembly 8 comprises a first motor in-out oil port 81 arranged at one end of the first driving motor group 41 and a second motor in-out oil port 82 arranged at one end of the second driving motor group 42, the first motor in-out oil port 81 and the second motor in-out oil port 82 are arranged in parallel and communicated with the second in-out oil port 52, and the first motor in-out oil port 81 of the first driving motor group 41 and the second motor in-out oil port 82 of the second driving motor group 42 are communicated with each other through the second in-out oil port 52.

[0030] Combined with Figure 1 As shown, the oil discharge assembly 6 comprises a first oil discharge port 62 arranged at one end of the first driving motor group 41, and a second oil discharge port 63 arranged at one end of the second driving motor group 42, the first oil discharge port 62 and the second oil discharge port 63 are arranged in parallel and communicated with the oil discharge pipeline 61, the first driving motor group 41 can be discharged through the first oil discharge port 62 through the oil discharge pipeline 61, and the second driving motor group 42 can be discharged through the second oil discharge port 63, one side of the first oil discharge port 62 is provided with a first motor oil inlet port 412 connected with a first motor oil inlet pipeline 411, one side of the second oil discharge port 63 is provided with a second motor oil inlet port 422 connected with a second motor oil inlet pipeline 421, one end of the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 is connected through a running main valve oil outlet port 224, the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 are arranged in series and communicated with each other through the running main valve oil outlet port 224, the throttle valve group 25 has a first throttle valve 251 and a second throttle valve 252, the flow of the accumulator 27 can be adjusted through the second throttle valve 252, the accumulator 27 can generate hydraulic pressure for the hydraulic parking system 1 for a long time, the equipment can be dragged and walked for a long time, and the trailer efficiency is improved.

[0031] Specifically, the hydraulic parking system 1 is connected with the external control pilot port 3 through the hydraulic parking pipeline 11, the hydraulic parking pipeline 11 is provided with a parking check valve 12, one side of the parking check valve 12 is provided with a supplement pipeline 264 in communication with the hydraulic parking pipeline 11, and the other side of the parking check valve 12 has, in sequence, an accumulator 27 and a second throttle valve 252 arranged on the hydraulic parking pipeline 11, the second throttle valve 252 is in a normal closed state without leakage, and when it is necessary to control the hydraulic parking system 1 to tow a trailer, the second throttle valve 252 is opened to control the flow of hydraulic oil in the accumulator 27, when the hydraulic parking system 1 can normally operate, the hydraulic parking system can be opened through the oil pressure in the accumulator 27, and the parking check valve 12 on the hydraulic parking pipeline 11 can prevent the oil pressure of the accumulator 27 from leaking, ensure the oil pressure of the accumulator 27, and ensure that the equipment can tow and walk for a long time, until the hydraulic parking system 1 is closed due to insufficient pressure caused by internal leakage of the hydraulic parking system 1, and the equipment can no longer walk, thereby ensuring the towing effect of the equipment.

[0032] Wherein, the external control pilot port 3 is connected with the running electromagnetic valve oil inlet port 211, and the running electromagnetic valve oil inlet port 211 is connected with the running main valve oil inlet port 221, the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 are connected with the running main valve oil outlet port 222, and the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 are connected with the first running main valve connection channel 223 of the running main valve 22 through the above-mentioned shunt and current collection valve 24, the shunt and current collection valve 24 is a three-position four-way electromagnetic valve, and the shunt and current collection valve 24 includes a shunt and current collection valve closed oil port 241 and a shunt and current collection valve connection channel 242, and the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 are connected with the parallelly arranged shunt and current collection valve connection channel 242 respectively.

[0033] The principle of the embodiment is that when the device is in the trailer mode, when the hydraulic parking system 1 can be normally used, the second throttle valve 252 is opened, the hydraulic oil in the accumulator 27 can open the hydraulic parking system 1 through the hydraulic parking pipeline 11, and the hydraulic oil in the accumulator 27 can be prevented from leaking through the parking check valve 12, the oil pressure of the accumulator 27 is ensured, so that the device can be towed for a long time, and the hydraulic parking system 1 is closed until the hydraulic parking system 1 is insufficient due to internal leakage pressure, and the device cannot walk; when the hydraulic parking system 1 fails to control, the travel electromagnetic valve 21 is not powered, the outer control pilot port 3 is connected with the travel electromagnetic valve closed oil port 212, the travel main valve oil inlet port 221 is connected with the travel electromagnetic valve oil return port 213, one end of the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 is connected in series through the travel main valve oil outlet port 224 and is connected with the first inlet and outlet port 51, and the other end of the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 is connected in parallel with the second inlet and outlet port 52, and the first inlet and outlet port 51 and the second inlet and outlet port 52 are connected with each other through the driving structure 4, which can make the driving structure 4 rotate freely, and when the external traction device is used, the driving structure 4 can be passively rotated, and the device towed walking effect is ensured.

[0034] Embodiment two

[0035] The structure and working principle of the embodiment are basically the same as those of the first embodiment, and the difference is that, as shown in the figure, Figure 2 the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 are connected through the first throttle valve 251, the oil supplement overflow valve group 26 is connected with the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 respectively, the first throttle valve 251 can automatically compensate the inlet flow of the first driving motor group 41 and the second driving motor group 42 by adjusting the size of the first throttle valve 251, so that the device can keep straight during driving, and the first throttle valve 251 can keep straight in both forward and reverse directions of the wheeled device through the shunt and collector valve 24, so as to improve the driving stability, and when the first driving motor group 41 and the second driving motor group 42 have speed difference during normal driving, the oil supplement function of the oil supplement overflow valve group 26 can automatically compensate the flow to the motor with larger outer rotating radius and faster speed through the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421, so as to keep the device driving stability and improve the service life.

[0036] The oil supplement overflow valve group 26 comprises a first oil supplement overflow valve 261 and a second oil supplement overflow valve 262, the first oil supplement overflow valve 261 and the second oil supplement overflow valve 262 are provided with an oil supplement check valve 263, one side of the first oil supplement overflow valve 261 is communicated with the first motor oil inlet pipeline 411, one side of the second oil supplement overflow valve 262 is communicated with the second motor oil inlet pipeline 421, and the oil supplement check valve 263 is provided between the first oil supplement overflow valve 261 and the second oil supplement overflow valve 262, and the oil supplement check valve 263 is provided in parallel with the oil supplement pipeline 264 and communicated with the hydraulic parking system 1, the first drive motor group 41 can be supplemented by the first oil supplement overflow valve 261, and the second drive motor group 42 can be supplemented by the second oil supplement overflow valve 262, the external control pilot port 3 can supply oil to the first oil supplement overflow valve 261 and the second oil supplement overflow valve 262 through the hydraulic parking pipeline 11 and the oil supplement pipeline 264, and the oil supplement check valve 263 can prevent leakage.

[0037] The principle of the embodiment is that when the vehicle needs to run normally, the running electromagnetic valve oil inlet 211 is connected with the external control pilot port 3, and the running main valve oil inlet 221 is communicated with the running electromagnetic valve oil inlet 211, at this time, one end of the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 is connected with the running main valve oil outlet 222 and is not communicated with each other, the running main valve 22 is connected with the shunt and current valve 24 through the first running main valve connection channel 223, and is connected with the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421 through the shunt and current valve connection channel 242 of the shunt and current valve 24, the shunt and current valve 24 can compensate the first drive motor group 41 or the second drive motor group 42 respectively, ensure that the speed between the first drive motor group 41 and the second drive motor group 42 is basically consistent, and the first throttle valve 251 can adjust the flow of the first drive motor group 41 and the second drive motor group 42 through the first motor oil inlet pipeline 411 and the second motor oil inlet pipeline 421, so that the vehicle can keep straight during running, the first drive motor group 41 and the second drive motor group 42 can be further supplemented by the oil supplement overflow valve group 26, the equipment running stability is ensured, and the service life is improved.

[0038] Embodiment three

[0039] The structure and working principle of the embodiment are basically the same as those of the first embodiment, and the difference is that Figure 3As shown, the external control pilot port 3 is connected with the driving structure 4 through the traveling electromagnetic valve 21 or through the variable speed electromagnetic valve 23, and the variable speed electromagnetic valve 23 can increase the torque of the driving structure 4, and can be suitable for the vehicle climbing state and the heavy load state, and the first driving motor group 41 and the second driving motor group 42 are provided with a variable speed assembly 7 which is arranged in parallel with the variable speed electromagnetic valve 23, the variable speed assembly 7 comprises a first variable oil port 71 arranged on one side of the first motor inlet and outlet oil port 81, and a second variable oil port 72 arranged on one side of the second motor inlet and outlet oil port 82, and the first variable oil port 71 and the second variable oil port 72 are arranged in parallel and communicated with the variable speed electromagnetic valve 23 through a variable oil path 73, the variable speed electromagnetic valve 23 is a two-position three-way electromagnetic valve, and the variable speed electromagnetic valve 23 has a variable speed electromagnetic valve inlet oil port 231, a variable speed electromagnetic valve closed oil port 232 and a variable speed electromagnetic valve return oil port 233, in the trailer walking mode, the first variable oil port 71 and the second variable oil port 72 are communicated with the variable speed electromagnetic valve closed oil port 232 through the variable oil path 73, and the external control pilot port 3 is connected with the variable speed electromagnetic valve closed oil port 232, and in the normal driving process, the first variable oil port 71 and the second variable oil port 72 are connected with the variable speed electromagnetic valve inlet oil port 231 through the variable oil path 73, and the external control pilot port 3 is connected with the variable speed electromagnetic valve inlet oil port 231.

[0040] The principle of the embodiment is that when the variable speed electromagnetic valve 23 has a certain variable speed pilot oil, the driving structure 4 generally changes to a large displacement state, and the speed of the driving structure 4 slows down, the output torque increases, and the vehicle can have more power when climbing or working under heavy load, and when the variable speed electromagnetic valve 23 has no hydraulic pressure, the displacement of the driving structure 4 changes to a small displacement state and the torque is small, and the driving structure pressure is high under the same load, and if a large load is encountered in the forward direction, the relief valve group 26 can be used to overflow to ensure the stability of the vehicle driving.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0042] Although the terms hydraulic parking system 1, hydraulic parking pipeline 11, parking check valve 12, control valve group 2, traveling solenoid valve 21, traveling solenoid valve oil inlet 211, traveling solenoid valve oil outlet 212, traveling solenoid valve oil return 213, traveling main valve 22, traveling main valve oil inlet 221, traveling main valve oil outlet 222, first traveling main valve connecting passage 223, traveling main valve oil outlet 224, second traveling main valve connecting passage 225, gear solenoid valve 23, gear solenoid valve oil inlet 231, gear solenoid valve oil outlet 232, gear solenoid valve oil return 233, shunt valve 24, shunt valve oil outlet 241, shunt valve connecting passage 242, throttle valve group 25, first throttle valve 251, second throttle valve 252, oil supplement overflow valve group 26, first oil supplement overflow valve 261, second oil supplement overflow valve 262, oil supplement check valve 263, oil supplement pipeline 264, accumulator 27, external control pilot port 3, drive structure 4, first drive motor group 41, first motor oil inlet pipeline 411, first motor oil inlet 412, second drive motor group 42, second motor oil inlet pipeline 421, second motor oil inlet 422, drive axle 43, oil inlet and outlet port 5, first oil inlet and outlet port 51, second oil inlet and outlet port 52, oil discharge assembly 6, oil discharge pipeline 61, first oil discharge port 62, second oil discharge port 63, variable gear assembly 7, first variable oil port 71, second variable oil port 72, variable oil passage 73, motor oil inlet and outlet assembly 8, first motor oil inlet and outlet port 81, second motor oil inlet and outlet port 82 are used more in the text, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the utility model; any additional restrictions on their interpretation are contrary to the spirit of the utility model.

Claims

1. A straight-line walking function control valve for a wheeled hydraulic double-drive trailer, comprising a hydraulic parking system (1) and a control valve group (2), wherein the control valve group (2) is provided with a traveling electromagnetic valve (21), a traveling main valve (22), a gear shifting electromagnetic valve (23), a shunt collector valve (24), a throttle valve group (25), an oil supplement overflow valve group (26), and an accumulator (27), characterized in that, The travel electromagnetic valve (21) is provided with an external control pilot port (3), the external control pilot port (3) is connected with the drive structure (4) through the travel electromagnetic valve (21) or through the gear electromagnetic valve (23), and the drive structure (4) is communicated with the inlet and outlet oil port (5).

2. The control valve for the straight-line walking function of a hydraulic double-drive trailer according to claim 1, characterized in that, The travel electromagnetic valve (21) is a two-position three-way electromagnetic valve, the travel electromagnetic valve (21) has a travel electromagnetic valve oil inlet (211), a travel electromagnetic valve oil closing port (212) and a travel electromagnetic valve oil return port (213), one end of the travel main valve (22) is provided with a travel main valve oil inlet (221), the external control pilot port (3) is connected with the travel electromagnetic valve oil closing port (212), and the travel main valve oil inlet (221) is communicated with the travel electromagnetic valve oil return port (213).

3. The control valve for the straight-line walking function of a hydraulic double-drive trailer according to claim 2, characterized in that, The travel main valve (22) includes a travel main valve oil closing port (222) and a first travel main valve connecting channel (223) arranged at one end of the travel main valve (22), the other end of the travel main valve (22) is provided with a travel main valve oil outlet (224) and a second travel main valve connecting channel (225), the travel main valve oil outlets (224) are connected in series, and the travel main valve oil outlets (224) are communicated with the second travel main valve connecting channel (225).

4. The control valve for the straight-line walking function of a hydraulic double-drive trailer according to claim 3, characterized in that, The inlet and outlet oil port (5) has a first inlet and outlet oil port (51) and a second inlet and outlet oil port (52), the first inlet and outlet oil port (51) is communicated with the travel main valve oil outlet (224) through the second travel main valve connecting channel (225), and the second inlet and outlet oil port (52) is arranged in parallel with the drive structure (4).

5. The control valve for the straight-line walking function of a hydraulic double-drive trailer according to claim 2 or 3 or 4, characterized in that, The drive structure (4) includes a first drive motor group (41) and a second drive motor group (42), the first drive motor group (41) and the second drive motor group (42) are connected through a drive bridge (43), one side of the first drive motor group (41) and the second drive motor group (42) is provided with a oil discharge assembly (6) arranged in parallel with the oil discharge pipeline (61), the other side of the first drive motor group (41) and the second drive motor group (42) is provided with a variable gear assembly (7) arranged in parallel with the gear electromagnetic valve (23), and the first drive motor group (41) and the second drive motor group (42) are provided with a motor inlet and outlet oil assembly (8) arranged in parallel with the second inlet and outlet oil port (52).

6. The control valve for the straight-line walking function of a hydraulic double-drive trailer according to claim 5, characterized in that, The motor inlet and outlet oil assembly (8) comprises a first motor inlet and outlet oil port (81) arranged at one end of the first driving motor group (41) and a second motor inlet and outlet oil port (82) arranged at one end of the second driving motor group (42), the first motor inlet and outlet oil port (81) and the second motor inlet and outlet oil port (82) are arranged in parallel and are communicated with the second inlet and outlet oil port (52), the variable speed assembly (7) comprises a first variable oil port (71) arranged at one side of the first motor inlet and outlet oil port (81), a second variable oil port (72) is arranged at one side of the second motor inlet and outlet oil port (82), the first variable oil port (71) and the second variable oil port (72) are arranged in parallel and are communicated with the variable speed electromagnetic valve (23) through the variable oil path (73), the variable speed electromagnetic valve (23) is a two-position three-way electromagnetic valve, and the variable speed electromagnetic valve (23) has a variable speed electromagnetic valve inlet oil port (231), a variable speed electromagnetic valve closed oil port (232) and a variable speed electromagnetic valve return oil port (233), the first variable oil port (71) and the second variable oil port (72) are communicated with the variable speed electromagnetic valve return oil port (233) through the variable oil path (73).

7. The control valve for the straight-line walking function of a hydraulic double-drive trailer according to claim 5, characterized in that, The oil discharge assembly (6) comprises a first oil discharge port (62) arranged at one end of the first driving motor group (41), and a second oil discharge port (63) arranged at one end of the second driving motor group (42), the first oil discharge port (62) and the second oil discharge port (63) are arranged in parallel and are communicated with the oil discharge pipeline (61), a first motor inlet oil port (412) connected with the first motor inlet pipeline (411) is arranged at one side of the first oil discharge port (62), a second motor inlet oil port (422) connected with the second motor inlet pipeline (421) is arranged at one side of the second oil discharge port (63), one end of the first motor inlet pipeline (411) and the second motor inlet pipeline (421) is connected through the travel main valve outlet oil port (224), the throttle valve group (25) has a first throttle valve (251) and a second throttle valve (252), the first motor inlet pipeline (411) and the second motor inlet pipeline (421) are communicated through the first throttle valve (251), and the oil supplement overflow valve group (26) is connected with the first motor inlet pipeline (411) and the second motor inlet pipeline (421) respectively.

8. The control valve for the straight-line walking function of a hydraulic double-drive trailer according to claim 7, characterized in that, The oil supplement overflow valve group (26) comprises a first oil supplement overflow valve (261) and a second oil supplement overflow valve (262), the first oil supplement overflow valve (261) and the second oil supplement overflow valve (262) are provided with an oil supplement check valve (263) therein, one side of the first oil supplement overflow valve (261) is communicated with the first motor inlet pipeline (411), one side of the second oil supplement overflow valve (262) is communicated with the second motor inlet pipeline (421), and the first oil supplement overflow valve (261) and the second oil supplement overflow valve (262) are provided with an oil supplement pipeline (264) arranged in parallel with the oil supplement check valve (263) and communicated with the hydraulic parking system (1).

9. The control valve for the straight-line walking function of a hydraulic double-drive trailer according to claim 8, characterized in that, The hydraulic parking system (1) is connected with the external control pilot port (3) through the hydraulic parking pipeline (11), the hydraulic parking pipeline (11) is provided with the parking check valve (12), one side of the parking check valve (12) is provided with the oil supplement pipeline (264) communicated with the hydraulic parking pipeline (11), and the other side of the parking check valve (12) is sequentially provided with the accumulator (27) and the second throttle valve (252) arranged on the hydraulic parking pipeline (11).

10. The control valve for the straight walking function of a hydraulic double drive trailer according to claim 7, characterized in that, The external control pilot port (3) is connected with the running electromagnetic valve oil inlet (211), the running electromagnetic valve oil inlet (211) is connected with the running main valve oil inlet (221), the first motor oil inlet pipeline (411) and the second motor oil inlet pipeline (421) are connected with the running main valve closed oil port (222), the first motor oil inlet pipeline (411) and the second motor oil inlet pipeline (421) are communicated with the first running main valve connection channel (223) of the running main valve (22) through the above-mentioned shunt and current collection valve (24), the shunt and current collection valve (24) is a three-position four-way electromagnetic valve, the shunt and current collection valve (24) includes the shunt and current collection valve closed oil port (241) and the shunt and current collection valve connection channel (242), and the first motor oil inlet pipeline (411) and the second motor oil inlet pipeline (421) are connected with the parallelly arranged shunt and current collection valve connection channel (242) respectively.

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