Closed pump drive system and engineering vehicle

Abstract

The present invention relates to the field of vehicle control technology, and more specifically, to a closed pump drive system and an engineering vehicle. A closed pump drive system includes an inner closed pump, an outer closed pump, an inner motor, and an outer motor. The inner closed pump includes an inner closed pump first oil port and an inner closed pump second oil port, and the outer closed pump includes an outer closed pump first oil port and an outer closed pump second oil port. Both the inner motor and the outer motor are used to drive the inner and outer wheels to rotate. The inner motor includes an inner motor first oil port and an inner motor second oil port, and the outer motor includes an outer motor first oil port and an outer motor second oil port. The inner closed pump is used to communicate with the outer closed pump. When the vehicle is driving normally and turning, the output flow of the inner and outer closed pumps can be adaptive to the required flow of the inner and outer motors, thereby improving the control of the closed pump drive system over the inner and outer motors and reducing the difficulty of vehicle steering.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a closed pump drive system and an engineering vehicle. Background Art

[0002] Steering in construction vehicles is achieved through a closed-loop pump drive system. This system on existing construction vehicles consists of left and right independent closed-loop pumps, a differential lock, and left and right motors, each of which drives the left and right wheels. The vehicle's steering is achieved by using the differential lock to control the flow rates of the left and right independent closed-loop pumps, which in turn control the power outputs of the left and right motors. This drives the left and right wheels to rotate at different speeds, thus achieving differential steering.

[0003] However, the differential lock achieves differential pressure output by varying the stroke of the cam mechanism at the articulated shaft, thereby controlling the flow rates of the left and right independent closed-circuit pumps. Frequent vehicle steering causes significant wear to the cam mechanism, making it impossible for the differential lock to control the differential flow rates of the left and right independent closed-circuit pumps. This means it cannot control the output power of the left and right motors or the speed of the left and right wheels, making steering difficult. Summary of the Invention

[0004] The problem solved by the present invention is how to ensure the control effect of the closed pump drive system on the vehicle so as to reduce the difficulty of vehicle steering.

[0005] To solve the above problems, the present invention provides a closed pump drive system for use in a vehicle, comprising an inner closed pump, an outer closed pump, an inner motor, and an outer motor. The inner closed pump comprises an inner closed pump first oil port and an inner closed pump second oil port, the outer closed pump comprises an outer closed pump first oil port and an outer closed pump second oil port, the inner motor and the outer motor are both used to drive the inner wheel and the outer wheel to rotate, the inner motor comprises an inner motor first oil port and an inner motor second oil port, and the outer motor comprises an outer motor first oil port and an outer motor second oil port;

[0006] The first oil port of the inner closed pump is used to communicate with the first oil port of the inner motor, the second oil port of the inner closed pump is used to communicate with the second oil port of the inner motor, the first oil port of the outer closed pump is used to communicate with the first oil port of the outer motor, and the second oil port of the outer closed pump is used to communicate with the second oil port of the outer motor;

[0007] The inner closed pump is used to communicate with the outer closed pump.

[0008] The technical effect of the present invention is as follows: the inner closed pump and the outer closed pump are connected, the oil pressure inside the inner closed pump and the outer closed pump are the same, and they can be automatically distributed according to the required flow of the inner motor and the outer motor. When the vehicle is driving normally, the flow required by the inner motor and the outer motor is the same, and the inner closed pump and the outer closed pump distribute the same flow to the inner motor and the outer motor. When the vehicle turns, the flow required by the inner motor is smaller, and the flow required by the outer motor is larger, and the inner closed pump and the outer closed pump distribute a smaller flow to the inner motor and a larger flow to the outer motor. Thus, the inner closed pump and the outer closed pump are connected, the oil pressure inside the inner closed pump and the outer closed pump are the same, and when the vehicle is driving normally and turning, the output flow of the inner closed pump and the outer closed pump can be adaptive to the required flow of the inner motor and the outer motor, thereby improving the control function of the closed pump drive system on the inner motor and the outer motor and reducing the difficulty of vehicle steering.

[0009] Optionally, the closed pump drive system further includes a driving main valve, an internal flow dividing and collecting valve, and an external flow dividing and collecting valve, wherein the driving main valve is used to adjust the on-off between the internal closed pump and the external closed pump, and the internal motor and the external motor are both provided with multiple;

[0010] The internal diverter and collector valve includes a first oil port of the internal diverter and collector valve and a second oil port of the internal diverter and collector valve. There are multiple second oil ports of the internal diverter and collector valve. Multiple first oil ports of the external motor are connected to multiple second oil ports of the internal diverter and collector valve. The first oil port of the internal diverter and collector valve is used to be connected to the first oil port of the internal closed pump. The external diverter and collector valve includes a first oil port of the external diverter and collector valve and a second oil port of the external diverter and collector valve. There are multiple second oil ports of the external diverter and collector valve. Multiple first oil ports of the external motor are connected to multiple second oil ports of the external diverter and collector valve. The first oil port of the external diverter and collector valve is used to be connected to the first oil port of the external closed pump.

[0011] Optionally, the driving main valve includes an internal communication structure, an external communication structure, and a cartridge valve, the internal communication structure includes a first oil port of the internal communication structure, a second oil port of the internal communication structure, a third oil port of the internal communication structure, and a fourth oil port of the internal communication structure, and the external communication structure includes a first oil port of the external communication structure, a second oil port of the external communication structure, a third oil port of the external communication structure, and a fourth oil port of the external communication structure;

[0012] The first oil port of the internal communication structure is communicated with the first oil port of the internal closed pump, the second oil port of the internal communication structure is communicated with the second oil port of the internal closed pump, the third oil port of the internal communication structure is used to communicate with the first oil port of the internal motor, the fourth oil port of the internal communication structure is communicated with the second oil port of the internal motor, the first oil port of the external communication structure is communicated with the first oil port of the external closed pump, the second oil port of the external communication structure is communicated with the second oil port of the external closed pump, the third oil port of the external communication structure is used to communicate with the first oil port of the external motor, and the fourth oil port of the external communication structure is communicated with the second oil port of the external motor;

[0013] The cartridge valve is used to connect the internal communication structure and the external communication structure.

[0014] Optionally, the internal connecting structure includes a first overflow valve, the external connecting structure includes a second overflow valve, the first oil port of the internal closed pump is connected to the second oil port of the internal closed pump through the first overflow valve, and the first oil port of the external closed pump is connected to the second oil port of the external closed pump through the second overflow valve.

[0015] Optionally, the closed pump drive system also includes a control structure, which includes an anti-slip valve, the anti-slip valve includes a first connecting port and a second connecting port of the anti-slip valve, the first connecting port of the anti-slip valve is used to connect with the cartridge valve, the internal diverter and collector valve also includes an internal diverter and collector valve control port and a third oil port of the internal diverter and collector valve, the external diverter and collector valve also includes an external diverter and collector valve control port and a third oil port of the external diverter and collector valve, the second connecting port of the anti-slip valve is used to connect with the internal diverter and collector valve control port and the external diverter and collector valve control port, the internal closed pump also includes an internal closed pump third oil port, the internal closed pump third oil port is used to connect with the third oil port of the internal divert and collector valve and the third oil port of the external divert and collector valve.

[0016] Optionally, the control structure also includes a deceleration valve, which includes a first oil port and a second oil port of the deceleration valve. The internal motor also includes a third oil port and a fourth oil port of the internal motor. The external motor also includes a third oil port and a fourth oil port of the external motor. The first oil port of the deceleration valve is used to communicate with the third oil port of the internal motor and the third oil port of the external motor. The second oil port of the deceleration valve is used to communicate with the external closed pump. The fourth oil port of the internal motor and the fourth oil port of the external motor are used to communicate with the driving main valve.

[0017] Optionally, the closed pump drive system further includes a control switch, and the control switch is used to be connected to the control structure.

[0018] Optionally, the control switch includes a slow-speed switch and an anti-slip switch, the driving main valve includes a reversing valve, the slow-speed switch is connected to the slow-speed valve and the reversing valve respectively, the reversing valve is used to be connected to the cartridge valve, and the anti-slip switch is connected to the anti-slip valve.

[0019] Optionally, the deceleration valve, the anti-slip valve, and the reversing valve are all provided with air-controlled valves.

[0020] The present invention also provides an engineering vehicle, further comprising the closed pump drive system as described above.

[0021] Technical effects of the present invention: The present invention includes the closed pump drive system described above, which has the same technical effects as the closed pump drive system and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the closed pump drive system of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the inner closed pump;

[0024] Figure 3 for Figure 1 Structural diagram of Chinese and foreign closed pumps;

[0025] Figure 4 for Figure 1 Schematic diagram of the structure of the middle drive main valve;

[0026] Figure 5 for Figure 1 Structural diagram of the control structure;

[0027] Figure 6 for Figure 1 Schematic diagram of the structure of the control switch;

[0028] Figure 7 for Figure 1 Schematic diagram of the structure of the inner flow dividing and collecting valve;

[0029] Figure 8 for Figure 1 Schematic diagram of the structure of the Chinese and foreign diverter and collector valves;

[0030] Figure 9 for Figure 1 Schematic diagram of the structure of the inner motor;

[0031] Figure 10 for Figure 1 Schematic diagram of the structure of Chinese and foreign motors.

[0032] Reference numerals:

[0033] 11. Internal closed pump; 111. Internal closed pump first oil port; 112. Internal closed pump second oil port; 12. External closed pump; 121. External closed pump first oil port; 122. External closed pump second oil port; 21. Internal motor; 211. Internal motor first oil port; 212. Internal motor second oil port; 213. Internal motor third oil port; 214. Internal motor fourth oil port; 215. Internal motor fifth oil port; 22. External motor; 22 1. External motor first oil port; 222. External motor second oil port; 223. External motor third oil port; 224. External motor fourth oil port; 225. External motor fifth oil port; 3. Driving main valve; 311. Internal connecting structure first oil port; 312. Internal connecting structure second oil port; 313. Internal connecting structure third oil port; 314. Internal connecting structure fourth oil port; 321. External connecting structure first oil port; 322. External connecting structure second oil port Second oil port; 323, external connecting structure third oil port; 324, external connecting structure fourth oil port; 33, cartridge valve; 341, first relief valve; 342, second relief valve; 351, first logic valve; 352, second logic valve; 36, reversing valve; 37, shuttle valve; 41, internal flow dividing and collecting valve; 411, first oil port of internal flow dividing and collecting valve; 412, second oil port of internal flow dividing and collecting valve; 413, third oil port of internal flow dividing and collecting valve Oil port; 414, internal diverter and collector valve control port; 42, external diverter and collector valve; 421, first oil port of external diverter and collector valve; 422, second oil port of external diverter and collector valve; 423, third oil port of external diverter and collector valve; 424, control port of external diverter and collector valve; 5. Control structure; 51, anti-skid valve; 52, retarding valve; 53, parking valve; 6. Control switch; 61, anti-skid switch; 62, retarding switch; 63, parking switch. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] To solve the above problems, Figures 1-4 、 Figure 9 、 Figure 10 As shown, a closed pump drive system according to an embodiment of the present invention is applied to a vehicle, comprising an inner closed pump 11, an outer closed pump 12, an inner motor 21, and an outer motor 22. The inner closed pump 11 comprises an inner closed pump first oil port 111 and an inner closed pump second oil port 112, the outer closed pump 12 comprises an outer closed pump first oil port 121 and an outer closed pump second oil port 122, the inner motor 21 and the outer motor 22 are both used to drive the inner wheel and the outer wheel to rotate, the inner motor 21 comprises an inner motor first oil port 211 and an inner motor second oil port 212, the outer motor 22 comprises an outer motor first oil port 221 and an outer motor second oil port 222;

[0036] The first oil port 111 of the inner closed pump is used to communicate with the first oil port 211 of the inner motor, the second oil port 112 of the inner closed pump is used to communicate with the second oil port 212 of the inner motor, the first oil port 121 of the outer closed pump is used to communicate with the first oil port 221 of the outer motor, and the second oil port 122 of the outer closed pump is used to communicate with the second oil port 222 of the outer motor;

[0037] The inner closed pump 11 is used to communicate with the outer closed pump 12 .

[0038] In this embodiment, six motors are provided, namely, three inner motors 21 and three outer motors 22. The inner closed pump 11 and the outer closed pump 12 are connected so that the oil pressure in the inner closed pump 11 and the outer closed pump 12 are the same. At this time, the closed pump drive system can automatically distribute oil according to the flow required by the motor, so as to realize the self-adaptation of the closed pump drive system and the flow required by the motor. That is, when the vehicle is driving normally, the flow required by the inner motor 21 and the outer motor 22 is the same. The inner closed pump 11 supplies oil to the inner motor 21 through the inner closed pump first oil port 111 and the inner motor first oil port 211, and returns oil through the inner motor second oil port 212 and the inner closed pump second oil port 112. The outer closed pump 12 returns oil through the outer closed pump first oil port 121 , the first oil port 221 of the outer motor supplies oil to the outer motor 22, and returns oil through the second oil port 222 of the outer motor and the second oil port 122 of the outer closed pump. The flow rates allocated to the inner motor 21 and the outer motor 22 are the same, and the rotation speeds of the inner and outer wheels are the same; at the same time, when the vehicle turns, the flow rate required by the inner motor 21 is less than the flow rate required by the outer motor 22, and the inner closed pump 11 can supply oil to the outer motor 22 through the outer closed pump 12, the first oil port 121 of the outer closed pump, and the first oil port 221 of the outer motor. The flow rate allocated to the inner motor 21 is less than the flow rate allocated to the outer motor 22, and the rotation speed of the inner wheel is less than the rotation speed of the outer wheel.

[0039] In summary, connecting the inner and outer closed pumps 11 and 12 results in the same oil pressure within them, allowing them to automatically distribute oil according to the required flow rates of the inner and outer motors 21 and 22. During normal vehicle operation, the inner and outer motors 21 and 22 require the same flow rates, and the inner and outer closed pumps 11 and 12 distribute the same flow rates to the inner and outer motors 21 and 22 respectively. However, when the vehicle turns, the inner motor 21 requires a lower flow rate, while the outer motor 22 requires a higher flow rate. Consequently, the inner and outer closed pumps 11 and 12 distribute a lower flow rate to the inner motor 21 and a higher flow rate to the outer motor 22. Thus, the inner closed pump 11 and the outer closed pump 12 are connected, and the oil pressure in the inner closed pump 11 and the outer closed pump 12 is the same. When the vehicle is driving and turning normally, the output flow of the inner closed pump 11 and the outer closed pump 12 can be adaptive to the required flow of the inner motor 21 and the outer motor 22, thereby improving the control effect of the closed pump drive system on the inner motor 21 and the outer motor 22 and reducing the difficulty of vehicle steering.

[0040] Alternatively, as Figure 4 、 Figure 7 、 Figure 8 As shown, the closed pump drive system also includes a driving main valve 3, an internal diverter and collector valve 41, and an external diverter and collector valve 42. The driving main valve 3 is used to adjust the on-off between the internal closed pump 11 and the external closed pump 12. The internal motor 21 and the external motor 22 are both provided with multiple;

[0041] The internal diverter and collecting valve 41 includes an internal diverter and collecting valve first oil port 411 and an internal diverter and collecting valve second oil port 412. There are multiple internal diverter and collecting valve second oil ports 412. Multiple external motor first oil ports 221 are connected to multiple internal diverter and collecting valve second oil ports 412. The internal diverter and collecting valve first oil port 411 is used to connect with the internal closed pump first oil port 111. The external diverter and collecting valve 42 includes an external diverter and collecting valve first oil port 421 and an external diverter and collecting valve second oil port 422. There are multiple external diverter and collecting valve second oil ports 422. Multiple external motor first oil ports 221 are connected to multiple external diverter and collecting valve second oil ports 422. The external diverter and collecting valve first oil port 421 is used to connect with the external closed pump first oil port 121.

[0042] In this embodiment, when the vehicle is driving normally or turning, the main valve 3 is adjusted to connect the inner closed pump 11 with the outer closed pump 12. The output flow rates of the inner closed pump 11 and the outer closed pump 12 can be adaptively adjusted to the required flow rates of the inner motor 21 and the outer motor 22. When the vehicle slips, it is necessary to reduce the wheel speed to improve the vehicle's adhesion. The main valve 3 is adjusted to disconnect the inner closed pump 11 from the outer closed pump 12, and the inner diverter and collector valve 41 and the outer diverter and collector valve 42 are opened respectively. The inner closed pump 11 supplies oil to the multiple inner motors 21 through the first oil port 111 of the inner closed pump, the first oil port 411 of the inner diverter and collector valve, the multiple second oil ports 412 of the inner diverter and collector valves, and the multiple first oil ports 211 of the inner motors. The external closed pump 12 supplies oil to the multiple external motors 22 through the external closed pump first oil port 121, the external diverter and collector valve first oil port 421, the multiple external diverter and collector valve second oil ports 422, and the multiple external motor first oil ports 221. The internal diverter and collector valve 41 and the external diverter and collector valve 42 control the oil intake of the internal motors 21 and the external motors 22. This can adjust the speed of the internal motors 21 and the external motors 22, slowing down the wheels with faster speeds to improve the vehicle's adhesion. Thus, by providing the main drive valve 3, the internal diverter and collector valve 41, and the external diverter and collector valve 42, when the vehicle is driving normally or turning, the main drive valve 3 can be used to open the connection between the internal closed pump 11 and the external closed pump 12, ensuring that the output flow of the closed pump drive system is compatible with the required flow of the internal motors 21 and the external motors 22. When the vehicle slips, the main driving valve 3 can be used to disconnect the connection between the inner closed pump 11 and the outer closed pump 12. The inner closed pump 11 supplies oil to the multiple inner motors 21 through the inner diverter and collector valve 41, and the outer closed pump 12 supplies oil to the multiple outer motors 22 through the outer diverter and collector valve 42. This reduces the speed of the inner motors 21 and the outer motors 22 with faster rotation speeds, thereby reducing the rotation speed of the wheels to improve the adhesion of the vehicle, thereby preventing the vehicle from slipping.

[0043] Alternatively, as Figure 4 As shown, the driving main valve 3 includes an internal communication structure, an external communication structure, and a cartridge valve 33. The internal communication structure includes a first oil port 311, a second oil port 312, a third oil port 313, and a fourth oil port 314 of the internal communication structure. The external communication structure includes a first oil port 321, a second oil port 322, a third oil port 323, and a fourth oil port 324 of the external communication structure.

[0044] The first oil port 311 of the internal communication structure is communicated with the first oil port 111 of the internal closed pump, the second oil port 312 of the internal communication structure is communicated with the second oil port 112 of the internal closed pump, the third oil port 313 of the internal communication structure is used to communicate with the first oil port 211 of the internal motor, the fourth oil port 314 of the internal communication structure is communicated with the second oil port 212 of the internal motor, the first oil port 321 of the external communication structure is communicated with the first oil port 121 of the external closed pump, the second oil port 322 of the external communication structure is communicated with the second oil port 122 of the external closed pump, the third oil port 323 of the external communication structure is used to communicate with the first oil port 221 of the external motor, and the fourth oil port 324 of the external communication structure is communicated with the second oil port 222 of the external motor;

[0045] The cartridge valve 33 is used to connect the internal communication structure and the external communication structure.

[0046] In this embodiment, when the vehicle turns, the cartridge valve 33 opens, connecting the internal and external communication structures. The oil in the internal closed pump 11 flows into the internal communication structure through the internal closed pump first port 111 and the internal communication structure first port 311. The oil in the external closed pump 12 flows into the external communication structure through the external closed pump first port 121 and the external communication structure first port 321. Because the internal and external communication structures are connected, the oils mix within the main valve 3 and achieve the same pressure. When the vehicle turns, the flow rate output by the internal closed pump 11 exceeds the flow rate required by the internal motor 21. The excess flow rate output by the internal closed pump 11 flows into the external motor 22 through the cartridge valve 33, thereby achieving vehicle steering. Simultaneously, oil returns through the internal motor second port 212, the internal communication structure second port 312, and the internal closed pump second port 112. Oil returns through the external motor second port 222, the external communication structure second port 322, and the external closed pump second port 122. Therefore, by setting the driving main valve 3 as an internal connecting structure, an external connecting structure and a plug-in valve 33, the output oil of the internal closed pump 11 and the external closed pump 12 can have the same oil pressure after mixing, ensuring that the output flow of the closed pump drive system can adapt to the required flow of the internal motor 21 and the external motor 22.

[0047] Alternatively, as Figure 4 As shown, the internal connecting structure includes a first overflow valve 341, and the external connecting structure includes a second overflow valve 342. The first oil port 311 of the internal connecting structure is connected to the second oil port 312 of the internal connecting structure through the first overflow valve 341, and the first oil port 321 of the external connecting structure is connected to the second oil port 322 of the external connecting structure through the second overflow valve 342.

[0048] In this embodiment, for example, the internal communication structure further includes a first logic valve 351, and the external communication structure further includes a second logic valve 352. When the vehicle is moving forward, high-pressure oil enters the internal motor 21 through the first oil port 311 of the internal communication structure and enters the external motor 22 through the first oil port 321 of the external communication structure. During normal driving, the first oil port 311 of the internal communication structure and the first oil port 321 of the external communication structure serve as high-pressure chambers, the fourth oil port 314 of the internal communication structure and the fourth oil port 324 of the external communication structure serve as low-pressure chambers, the first relief valve 341 and the second relief valve 342 do not overflow, there is no pressure difference across the first logic valve 351 and the second logic valve 352, the first logic valve 351 and the second logic valve 352 are normally open, and oil flows back to the closed pump through the second oil port 312 of the internal communication structure and the second oil port 322 of the external communication structure. When the vehicle experiences reverse drag, the fourth oil port 314 of the internal communication structure and the fourth oil port 324 of the external communication structure become high-pressure chambers. When the reverse drag pressure differential exceeds 62 bar, the first relief valve 341 and the second relief valve 342 begin to overflow, controlling the pressure differential between the output ports of the first logic valve 351 and the second logic valve 352 to no more than 76 bar. Thus, the closed-loop pump drive system limits the high-pressure side pressure of the internal closed-loop pump 11 and the external closed-loop pump 12 during reverse drag, thereby limiting the engine torque during reverse drag and preventing engine overspeed.

[0049] Alternatively, as Figures 1-4 、 Figure 5 、 Figure 7 、 Figure 8 As shown, the closed pump drive system also includes a control structure 5, which includes an anti-slip valve 51. The anti-slip valve 51 includes a first connecting port of the anti-slip valve and a second connecting port of the anti-slip valve. The first connecting port of the anti-slip valve is used to connect with the plug-in valve 33. The internal diverter and collector valve 41 also includes a third oil port 413 of the internal diverter and collector valve and a control port 414 of the internal diverter and collector valve. The external diverter and collector valve 42 also includes a third oil port 423 of the external diverter and collector valve and a control port 424 of the external diverter and collector valve. The second connecting port of the anti-slip valve is used to connect with the control port 414 of the internal diverter and collector valve and the control port 424 of the external diverter and collector valve. The internal closed pump 11 also includes a third oil port 113 of the internal closed pump. The third oil port 113 of the internal closed pump is used to connect with the third oil port 413 of the internal diverter and collector valve and the third oil port 423 of the external diverter and collector valve.

[0050] In this embodiment, the anti-slip valve 51 is illustratively configured as a gas-controlled valve. By inputting gas through the anti-slip valve 51 to the inner diverter / collector valve control port 414 and the outer diverter / collector valve control port 424, the anti-slip valve 51 can open the inner diverter / collector valve's third oil port 413 and the outer diverter / collector valve's third oil port 423. The inner closed pump 11 can then supply oil to the inner diverter / collector valve 41 and the outer diverter / collector valve 42 through the inner closed pump's third oil port 113, the inner diverter / collector valve's third oil port 413, and the outer diverter / collector valve's third oil port 423, respectively, thereby controlling the inner diverter / collector valve 41 and the outer diverter / collector valve 42 to forcibly divert the oil. Therefore, the anti-skid valve 51 can be used to adjust the inner diverter and collector valve 41 and the outer diverter and collector valve 42 to ensure that the inner motor 21 and the outer motor 22 can obtain flow in proportion, which is beneficial to adjust the inner wheel speed and the outer wheel speed to the same, so as to reduce the wheel speed and increase adhesion, thereby preventing the vehicle from slipping.

[0051] Alternatively, as Figures 1-4 、 Figure 5 、 Figure 9 、 Figure 10 As shown, the control structure 5 also includes a slow-speed valve 52, the slow-speed valve 52 includes a first oil port of the slow-speed valve and a second oil port of the slow-speed valve, the internal motor 21 includes a third oil port 213 of the internal motor and a fourth oil port 214 of the internal motor, the external motor 22 includes a third oil port 223 of the external motor and a second oil port 224 of the external motor, the first oil port of the slow-speed valve is used to communicate with the third oil port 213 of the internal motor and the third oil port 223 of the external motor, the second oil port of the slow-speed valve is used to communicate with the external closed pump 12, the fourth oil port 214 of the internal motor and the fourth oil port 224 of the external motor are used to communicate with the driving main valve 3.

[0052] In this embodiment, the main drive valve 3 further includes a shuttle valve 36, which includes a first communication port, a second communication port, and a third communication port. The first communication port communicates with the internal communication structure, the second communication port communicates with the external communication structure, and the third communication port communicates with the fourth oil port 214 of the internal motor and the fourth oil port 224 of the external motor. When the retarder valve 52 is opened, the oil in the external closed pump 12 enters the retarder valve 52 and flows into the internal motor 21 through the first oil port of the retarder valve and the third oil port 213 of the internal motor, adjusting the internal motor 21 to its maximum displacement. The oil then flows into the external motor 22 through the first oil port of the retarder valve and the third oil port 223 of the external motor, adjusting the external motor 22 to its maximum displacement. At the same time, oil return can be achieved through the fourth oil port 214 of the internal motor, the fourth oil port 224 of the external motor, and the shuttle valve 36. Therefore, by setting the slow-speed valve 52, the displacement of the inner motor 21 and the outer motor 22 can be adjusted to the maximum, that is, the speed of the inner motor 21 and the outer motor 22 can be adjusted to the minimum, that is, the speed of the wheel is reduced. On the one hand, it can prevent the vehicle from creeping when going downhill.

[0053] Alternatively, as Figure 1As shown, the closed pump drive system further includes a control switch 6 , which is used to connect with the anti-slip valve 51 and the retarding valve 52 .

[0054] In this embodiment, a control switch 6 is provided, and the control switch 6 can be provided in a control room of the vehicle. By controlling the anti-skid valve 51 and the retarding valve 52 through the control switch 6, it is convenient to control the anti-skid and retarding movement of the vehicle.

[0055] Alternatively, as Figure 7 As shown, the control switch 6 includes a slow-speed switch 62 and an anti-slip switch 61, and the driving main valve 3 includes a reversing valve 36. The slow-speed switch 62 is respectively connected to the slow-speed valve 52 and the reversing valve 36. The reversing valve is used to connect to the cartridge valve 33, and the anti-slip switch 61 is connected to the anti-slip valve 51.

[0056] In this embodiment, the reversing valve is illustratively connected to the fourth oil port 214 of the inner motor and the fourth oil port 224 of the outer motor. When the vehicle slips, the retarder switch 62 is first opened. The retarder switch 62 can control the reversing of the retarder valve 52 and the reversing valve, respectively. On the one hand, the retarder valve 52 is used to adjust the inner motor 21 and the outer motor 22 to maximum displacement. On the other hand, the reversing valve closes the cartridge valve 33 to disconnect the inner closed pump 11 and the outer closed pump 12. Then, the anti-skid switch 61 is opened, and the anti-skid valve 51 is controlled by the anti-skid switch 61, so that the inner flow dividing and combining valve 41 and the outer flow dividing and combining valve 42 respectively proportionally control the flow into the multiple inner motors 21 and the multiple outer motors 22. Therefore, when the vehicle slips and needs to turn, it is necessary to first use the deceleration switch 62 to control the deceleration valve 52, adjust the displacement of the inner motor 21 and the outer motor 22 to the maximum to reduce the vehicle speed, and then control the inner diversion and collecting valve 41 and the outer diversion and collecting valve 42 through the anti-skid switch 61 to force diversion, and adjust the speed of the inner and outer wheels to the same, so as to avoid the vehicle speed being too fast when slipping and not having enough time to turn, thereby ensuring the safety of the vehicle during driving.

[0057] Optionally, the retarding valve 52 , the anti-slip valve 51 and the reversing valve 36 are all provided with air-controlled valves.

[0058] In this embodiment, the deceleration switch 62 is turned on, and the air source can enter the deceleration valve 52 and the reversing valve 36 respectively to open the deceleration valve 52 and the reversing valve 36. The anti-slip switch 61 is turned on, and the air source can enter the anti-slip valve 51 to open the anti-slip valve 51.

[0059] Alternatively, as Figure 6 、 Figure 7 As shown, the control switch also includes a parking switch 63, and the control structure also includes a parking valve 53. The parking switch is used to control the parking valve 53, and the parking valve 53 is connected to the external closed pump 12, the reducer of the internal motor 21, and the reducer of the external motor 22 respectively.

[0060] In this embodiment, when the parking switch 63 is turned on, the air source can enter the parking valve 53, opening the parking valve 53. The oil in the external closed pump 12 can enter the reducer of the inner motor 21 and the reducer of the outer motor 22, controlling the deceleration of the inner motor 21 and the outer motor 22. At the same time, when the parking valve 53 is opened, the gear handle valve is closed.

[0061] Another embodiment of the present invention provides an engineering vehicle, comprising the closed pump drive system as described above.

[0062] In this embodiment, the engineering vehicle includes the closed pump drive system described above, which has the same technical effects as the closed pump drive system and will not be described in detail here.

[0063] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A closed pump drive system, applied to a vehicle, characterized in that: The invention comprises an inner closed pump (11), an outer closed pump (12), an inner motor (21), and an outer motor (22); the inner closed pump (11) comprises an inner closed pump first oil port (111) and an inner closed pump second oil port (112); the outer closed pump (12) comprises an outer closed pump first oil port (121) and an outer closed pump second oil port (122); the inner motor (21) and the outer motor (22) are both used to drive the inner wheel and the outer wheel to rotate; the inner motor (21) comprises an inner motor first oil port (211) and an inner motor second oil port (212); the outer motor (22) comprises an outer motor first oil port (221) and an outer motor second oil port (222); The first oil port (111) of the inner closed pump is used to communicate with the first oil port (211) of the inner motor, the second oil port (112) of the inner closed pump is used to communicate with the second oil port (212) of the inner motor, the first oil port (121) of the outer closed pump is used to communicate with the first oil port (221) of the outer motor, and the second oil port (122) of the outer closed pump is used to communicate with the second oil port (222) of the outer motor; The inner closed pump (11) is used to communicate with the outer closed pump (12); The closed pump drive system further comprises a drive main valve (3), an internal flow dividing and collecting valve (41), and an external flow dividing and collecting valve (42); the drive main valve (3) is used to adjust the on-off between the internal closed pump (11) and the external closed pump (12); the internal motor (21) and the external motor (22) are both provided with a plurality of valves; the drive main valve (3) comprises an internal connecting structure, an external connecting structure, and a cartridge valve (33); the internal connecting structure comprises a first oil port (311) of the internal connecting structure, a second oil port (312) of the internal connecting structure, a third oil port (313) of the internal connecting structure, and a fourth oil port (314) of the internal connecting structure; and the external connecting structure comprises a first oil port (321) of the external connecting structure, a second oil port (322) of the external connecting structure, a third oil port (323) of the external connecting structure, and a fourth oil port (324) of the external connecting structure.

2. The closed pump drive system according to claim 1, characterized in that: The internal flow-dividing and collecting valve (41) comprises a first oil port (411) of the internal flow-dividing and collecting valve and a second oil port (412) of the internal flow-dividing and collecting valve. There are a plurality of the second oil ports (412) of the internal flow-dividing and collecting valve. A plurality of the first oil ports (221) of the external motor are in communication with a plurality of the second oil ports (412) of the internal flow-dividing and collecting valve. The first oil port (411) of the internal flow-dividing and collecting valve is used to be in communication with the first oil port (111) of the internal closed pump. The external flow-dividing and collecting valve (42) comprises a first oil port (421) of the external flow-dividing and collecting valve and a second oil port (422). There are a plurality of the second oil ports (422) of the external flow-dividing and collecting valve. A plurality of the first oil ports (221) of the external motor are in communication with a plurality of the second oil ports (422) of the external flow-dividing and collecting valve. The first oil port (421) of the external flow-dividing and collecting valve is used to be in communication with the first oil port (121) of the external closed pump.

3. The closed pump drive system according to claim 2, characterized in that: The first oil port (311) of the internal communication structure is in communication with the first oil port (111) of the internal closed pump, the second oil port (312) of the internal communication structure is in communication with the second oil port (112) of the internal closed pump, the third oil port (313) of the internal communication structure is used to be in communication with the first oil port (211) of the internal motor, the fourth oil port (314) of the internal communication structure is in communication with the second oil port (212) of the internal motor, the first oil port (321) of the external communication structure is in communication with the first oil port (121) of the external closed pump, the second oil port (322) of the external communication structure is in communication with the second oil port (122) of the external closed pump, the third oil port (323) of the external communication structure is used to be in communication with the first oil port (221) of the external motor, and the fourth oil port (324) of the external communication structure is in communication with the second oil port (222) of the external motor; The plug-in valve (33) is used to connect the internal communication structure and the external communication structure.

4. The closed pump drive system according to claim 3, characterized in that: The internal communication structure includes a first overflow valve (341), and the external communication structure includes a second overflow valve (342). The first oil port (311) of the internal communication structure is communicated with the second oil port (312) of the internal communication structure through the first overflow valve (341), and the first oil port (321) of the external communication structure is communicated with the second oil port (322) of the external communication structure through the second overflow valve (342).

5. The closed pump drive system according to claim 4, characterized in that: The invention also includes a control structure (5), wherein the control structure (5) includes an anti-slip valve (51), wherein the anti-slip valve (51) includes a first anti-slip valve communication port and a second anti-slip valve communication port, wherein the first anti-slip valve communication port is used to communicate with the cartridge valve (33), and the internal flow dividing and collecting valve (41) also includes a third oil port (413) of the internal flow dividing and collecting valve and a control port (414) of the internal flow dividing and collecting valve. The external flow dividing and collecting valve (42) also includes a third oil port (413) of the external flow dividing and collecting valve and a control port (414) of the external flow dividing and collecting valve. The second communication port of the anti-slip valve is used to communicate with the internal diverter and collector valve control port (414) and the external diverter and collector valve control port (424); the internal closed pump (11) further includes an internal closed pump third oil port (113); the internal closed pump third oil port (113) is used to communicate with the internal diverter and collector valve third oil port (413) and the external diverter and collector valve third oil port (423).

6. The closed pump drive system according to claim 5, characterized in that: The control structure (5) further includes a deceleration valve (52), the deceleration valve (52) including a first oil port of the deceleration valve and a second oil port of the deceleration valve, the internal motor (21) including a third oil port of the internal motor (213) and a fourth oil port of the internal motor (214), the external motor (22) including a third oil port of the external motor (223) and a fourth oil port of the external motor (224), the first oil port of the deceleration valve being used to communicate with the third oil port of the internal motor (213) and the third oil port of the external motor (223), the second oil port of the deceleration valve being used to communicate with the external closed pump (12), the fourth oil port of the internal motor (214) and the fourth oil port of the external motor (22) being used to communicate with the driving main valve (3).

7. The closed pump drive system according to claim 6, wherein: The closed pump drive system further comprises a control switch (6), and the control switch (6) is used to be connected to the control structure (5).

8. The closed pump drive system according to claim 7, wherein: The control switch (6) includes a deceleration switch (62) and an anti-slip switch (61); the driving main valve (3) includes a reversing valve (36); the deceleration switch (62) is connected to the deceleration valve (52) and the reversing valve (36) respectively; the reversing valve is used to be connected to the cartridge valve (33); and the anti-slip switch (61) is connected to the anti-slip valve (51).

9. The closed pump drive system according to claim 8, wherein: The deceleration valve (52), the anti-slip valve (51), and the reversing valve (36) are all provided with air-controlled valves.

10. An engineering vehicle, characterized in that: It also includes a drive system as described in any one of claims 1-9.

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