Hydraulic transmission case automatic reversing and automatic gear shifting control system

Abstract

The invention discloses an automatic reversing and automatic gear shifting control system for a hydraulic transmission case, which is characterized in that a locomotive control unit is connected with a control unit, and the locomotive control unit is used for providing a compressed air medium for the control unit; the output end of the oil supply unit is connected with the control unit, the lubricating unit and the automatic gear shifting unit so as to provide transmission oil. The lubricating unit is connected with the control unit and used for providing lubricating oil; the control unit is connected with the lubricating unit, the automatic gear shifting unit and the automatic reversing unit, and the control unit is used for achieving automatic gear shifting and automatic reversing operation on the hydraulic transmission box through the automatic reversing unit and the automatic gear shifting unit according to the transmission oil provided by the oil supply unit and the lubricating oil provided by the lubricating unit. The automatic reversing and automatic gear shifting control efficiency and precision of the hydraulic transmission box are effectively achieved, and meanwhile the flexibility of automatic gear shifting and reversing of the hydraulic transmission box is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic transmission technology, and in particular to an automatic reversing and automatic shifting control system for hydraulic transmissions. Background Technology

[0002] Currently, the hydraulic transmission is shifted via the locomotive control system. When the locomotive starts running, the onboard PC sends a command to operate the corresponding electro-pneumatic valve in the transmission. The control air in the electro-pneumatic valve controls the control valve of the transmission's first-gear torque converter, allowing oil from the transmission's oil supply pump to enter or exit the first-gear torque converter for charging and discharging, thus enabling the locomotive to operate in first gear. As the locomotive speed gradually increases and reaches the shift point, the onboard PC sends a command to operate the corresponding electro-pneumatic valve in the transmission. The control air in the electro-pneumatic valve controls the control valve of the transmission's second-gear torque converter, allowing oil from the transmission's oil supply pump to enter or exit the second-gear torque converter for charging and discharging, thus enabling the locomotive to operate in second gear.

[0003] Currently, the hydraulic transmission box is controlled by the locomotive control system for reversing. The onboard PC sends commands to operate the corresponding electro-pneumatic valves of the transmission box, and the reversing function is achieved by filling and draining oil on the hydraulic components on the corresponding hydraulic shaft. Automatic reversing operation cannot be achieved. Therefore, the hydraulic transmission box control system controls the shifting and reversing by operating the electronically controlled valves according to the locomotive control system, which still has the limitations of inconvenience and inflexibility. Summary of the Invention

[0004] This invention provides an automatic reversing and automatic shifting control system for a hydraulic transmission box to overcome the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: An automatic reversing and automatic shifting control system for a hydraulic transmission includes a locomotive control unit, an oil supply unit, a control unit, a lubrication unit, an automatic reversing unit, and an automatic shifting unit. The locomotive control unit is connected to the control unit, and the locomotive control unit is used to provide compressed air medium to the control unit; The output of the oil supply unit is connected to the control unit, the lubrication unit, and the automatic shifting unit respectively to supply transmission oil; The lubrication unit is connected to the control unit to provide lubricating oil; The control unit is connected to the lubrication unit, the automatic shifting unit, and the automatic reversing unit respectively. The control unit is used to realize the automatic shifting and automatic reversing operation of the hydraulic transmission box through the automatic reversing unit and the automatic shifting unit according to the transmission oil provided by the oil supply unit and the lubrication oil provided by the lubrication unit.

[0006] Furthermore, the automatic commutation unit includes a commutator and a sensing valve; The piston rod inside the commutator has a piston. The output end of the piston rod is connected to one end of the control lever, and the other end of the control lever is connected to one end of the gear shift lever. The other end of the gear shift lever is connected to the first spline shaft through a ball bearing, and the first spline shaft is sleeved on one end of the turbine shaft in the mechanical housing structure. The other end of the turbine shaft is connected to the output end of the rotating device. The turbine shaft is installed inside the mechanical housing structure and the hydraulic housing structure. The sensing valve is connected to the second pipe through the first pipe, and the sensing valve abuts against the end of the intermediate shaft inside the mechanical housing structure. The first spline shaft is provided with a first spline sleeve and a second spline sleeve on its periphery, and a first gear and a second gear are provided on the intermediate shaft; the first spline sleeve meshes with the first gear, one side of the second spline sleeve meshes with one side of the third gear; the other side of the second gear meshes with one side of the third gear fixed on the first mechanical shaft, the other side of the third gear meshes with one side of the fourth gear fixed on the second mechanical shaft, and the other side of the fourth gear is located inside the oil pan of the mechanical housing.

[0007] Furthermore, the automatic shifting unit includes a main control valve and a regulating valve; The main control valve is connected to the starting torque converter inside the hydraulic tank structure through the third and fourth pipelines; the main control valve is connected to the operating torque converter inside the hydraulic tank structure through the fifth and sixth pipelines; and the main control valve is connected to the regulating valve through the seventh pipeline.

[0008] Furthermore, the locomotive control unit includes a locomotive control unit, a control pump, a stabilizing valve, a switching valve, and a first check valve; The locomotive control unit is connected to the control unit, which includes a first gas channel, a second gas channel, a third gas channel, a fourth gas channel, and a fifth gas channel. The first gas channel and the second gas channel are connected to the top and bottom of the gas cavity inside the commutator through a first medium pipeline and a second medium pipeline, respectively. The third gas channel is connected to the main control valve through a third medium pipeline. The fourth gas channel and the fifth gas channel are connected to the sensing valve through a first pipeline and a second pipeline. A sixth medium pipeline for connecting the rotating device is provided on the first pipeline, and a seventh medium pipeline for connecting the rotating device is provided on the second pipeline. The first check valve is installed in the oil pan of the hydraulic tank at the bottom of the hydraulic tank structure. One end of the stabilizing valve is connected to the regulating valve in sequence through the eighth and ninth pipelines. One end of the control pump is connected to the switching valve through the tenth pipeline. One end of the first check valve is connected to the tenth pipeline. The other end of the control pump is connected to the ninth pipeline through the eleventh pipeline. On the ninth pipeline, located between the connection end of the eleventh and ninth pipelines and the regulating valve, there is a twelfth pipeline for connecting the switching valve.

[0009] Furthermore, the oil supply unit includes a driven vent pump, an active vent pump, an oil supply pump, a fine filter, a coarse filter, and a radiator; The input end of the driven vent pump is connected to the oil pan of the mechanical housing via the thirteenth pipeline; the output end of the driven vent pump is connected to the oil pan of the hydraulic housing via the fourteenth pipeline; a throttle valve is installed inside the mechanical housing structure, one end of which is connected to the oil pan of the mechanical housing via the fifteenth pipeline; the other end of the throttle valve is connected to the lubricating oil unit; one end of the fifteenth pipeline is connected to the sixteenth pipeline, and the other end of the sixteenth pipeline is connected to the input end of the active vent pump, the output end of the active vent pump is connected to the oil pan of the hydraulic housing via a preset pipeline; the oil supply pump is installed inside the oil pan of the hydraulic housing, the output end of which is connected to one end of the radiator via the seventeenth pipeline, and the other end of the radiator is connected to the main control valve via the eighteenth pipeline; one end of the seventeenth pipeline is connected to the nineteenth pipeline, and the other end of the nineteenth pipeline is connected to the regulating valve; the switching valve is connected to the eighteenth pipeline via the twentieth pipeline; the fine filter and the coarse filter are installed on the twentieth pipeline, and the fine filter is located between the coarse filter and the switching valve.

[0010] Furthermore, the lubrication unit includes an inertial pump and a second check valve; One end of the coasting pump is connected to the tenth pipe through the twenty-first pipe, and the other end of the coasting pump is connected to the twenty-third pipe through the twenty-second pipe. One end of the twenty-third pipe is connected to the twenty-first pipe, and the other end of the twenty-third pipe is connected to the lubrication point inside the hydraulic tank structure. The other end of the throttle valve is connected to the twenty-third pipe through the twenty-fourth pipe. One end of the twenty-fifth pipe is connected to the twenty-third pipe, and one end of the twenty-fifth pipe is connected to the twenty-first pipe. A second check valve is installed on the twenty-fifth pipe. The other end of the stabilizing valve is connected to the twenty-first pipe through the twenty-sixth pipe.

[0011] Beneficial effects: This invention provides an automatic reversing and automatic shifting control system for a hydraulic transmission box. Through the locomotive control unit and the lubrication unit, automatic shifting unit, and automatic reversing unit connected thereto, and based on the transmission oil provided by the oil supply unit and the control oil provided by the lubrication unit, the automatic reversing and automatic shifting operations of the hydraulic transmission box are realized through the automatic reversing and automatic shifting units. This effectively improves the efficiency and accuracy of the automatic reversing and automatic shifting control of the hydraulic transmission box, while also improving the flexibility of the automatic shifting and reversing of the hydraulic transmission box. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the automatic reversing and automatic shifting control system for the hydraulic transmission box of the present invention.

[0014] In the diagram: 1. Locomotive control unit; 2. Oil supply unit; 3. Control unit; 4. Lubrication unit; 5. Automatic reversing unit; 6. Automatic gear shifting unit; 51. Control pump; 481. Stabilizing valve; 482. Switching valve; 511. First check valve; 11. First gas passage; 12. Second gas passage; 6. Third gas passage; 10. Fourth gas passage; 8. Fifth gas passage; 647. First medium pipeline; 648. Second medium pipeline; 653. Third medium pipeline; 41. Main control valve; 652. Fourth medium pipeline 650, Fifth medium pipeline; 40, Reversing device; 44, Sensor valve; 401, Piston; 402, Piston rod; 403, Control lever; 405, Gear shift lever; 334, Ball bearing; 333, First splined shaft; 33, Turbine shaft; 43, Rotating device; 331, First splined sleeve; 332, Second splined sleeve; 321, First gear; 322, Second gear; 311, Third gear; 31, First mechanical shaft; 30, Second mechanical shaft; 301, Fourth gear; 651, First pipeline; 649, Second pipeline Pipeline 605; Third Pipeline 606; Fourth Pipeline 21; Starting Torque Converter 607; Fifth Pipeline 608; Sixth Pipeline 22; Operating Torque Converter 636; Seventh Pipeline 42; Regulating Valve 481; Stabilizing Valve 625; Eighth Pipeline 635; Ninth Pipeline 511; First Check Valve 613; Tenth Pipeline 624; Eleventh Pipeline 482; Switching Valve 638; Twelfth Pipeline 54; Driven Empty Pump 52; Active Empty Pump 50; Oil Supply Pump 56; Fine Filter 55; Coarse Filter Filter; 57, Radiator; 631, Thirteenth Pipe; 632, Fourteenth Pipe; 499, Throttling Valve; 633, Fifteenth Pipe; 634, Sixteenth Pipe; 601, Seventeenth Pipe; 603, Eighteenth Pipe; 614, Nineteenth Pipe; 611, Twentieth Pipe; 53, Coaster Pump; 483, Second Check Valve; 612, Twenty-first Pipe; 627, Twenty-second Pipe; 629, Twenty-third Pipe; 630, Twenty-fourth Pipe; 628, Twenty-fifth Pipe; 626, Twenty-sixth Pipe. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] This embodiment provides an automatic reversing and automatic shifting control system for a hydraulic transmission box, such as... Figure 1 As shown (where G represents the hydraulic tank oil pan and F represents the mechanical tank oil pan), it includes a locomotive control unit 1, an oil supply unit 2, a control unit 3, a lubrication unit 4, an automatic reversing unit 5, and an automatic shifting unit 6. The locomotive control unit 1 is connected to the control unit 3, and the locomotive control unit 1 is used to provide compressed air medium to the control unit 3. Specifically, the control unit 3 includes a control pump 51, a stabilizing valve 481, a switching valve 482, and a first check valve 511; the locomotive control unit 1 is connected to the control unit 3, and the control unit 3 includes a first gas channel 11, a second gas channel 12, a third gas channel 6, a fourth gas channel 10, and a fifth gas channel 8. The first gas channel 11 and the second gas channel 12 are respectively connected to the top and bottom of the gas cavity inside the commutator 40 through a first medium pipeline 647 and a second medium pipeline 648; the third gas channel 6 is connected to the main control valve 41 through a third medium pipeline 653; the fourth gas channel 10 and the fifth gas channel 8 are connected to the sensing valve 44 through a first pipeline 651 and a second pipeline 649; the first pipeline 651 is provided with a first pipeline 652 for connecting the rotating device 43, and the second pipeline 649 is provided with a second pipeline 650 for connecting the rotating device 43; In this embodiment, the locomotive control unit 1 provides compressed air as the air source. The first gas channel 11 and the first medium pipeline 647 in the control unit 3 are responsible for providing the air source for the mechanical transmission box to switch to direction A. The second gas channel 12 and the second medium pipeline 648 in the control unit 3 are responsible for providing the air source for the transmission box to switch to direction B. The third gas channel 6 and the third medium pipeline 653 in the control unit 3 are responsible for providing the air source for the main control valve 41 in the automatic shifting unit 6. The first channel 10 and the first pipeline 651 in the control unit 3 are responsible for receiving the return air from the sensing valve 44 of the automatic shifting unit 5. The fourth gas channel 10 and the first pipeline 649 in the control unit 3 are responsible for the air source for the sensing valve 44 of the automatic shifting unit 5. The second pipeline 650 is responsible for providing the air source from the control unit 3 to the turning mechanism, i.e., the rotating device 43, of the automatic shifting unit 5. The first pipeline 652 is responsible for the air source from the sensing valve 44 of the automatic shifting unit 5 to the turning mechanism 43 of the automatic shifting unit 5. The first check valve 511 is installed in the oil pan of the hydraulic tank at the bottom of the hydraulic tank structure. One end of the stabilizing valve 481 is connected to the regulating valve 42 through the eighth pipeline 625 and the ninth pipeline 635 in sequence. The first check valve 511 is connected to the switching valve 482 through the tenth pipeline 613. One end of the control pump 51 is connected to the switching valve 482 through the tenth pipeline 613. One end of the first check valve 511 is connected to the tenth pipeline 613. The other end of the control pump 51 is connected to the ninth pipeline 635 through the eleventh pipeline 624. A twelfth pipeline 638 for connecting the switching valve 482 is provided on the ninth pipeline 635 between the connection end of the eleventh pipeline 624 and the ninth pipeline 635 and the regulating valve 42.

[0017] The control process and oil supply process of the system described in this embodiment are as follows: After the engine starts, the control pump 51 in control unit 3 draws oil from the oil pan of the hydraulic tank through the first check valve 511 and the tenth pipe 613, and then draws it to the switching valve 482 through the eleventh pipe 624 and the twelfth pipe 638. The pressurized oil opens the switching valve 482 in control unit 3. At the same time, the pressurized oil from the radiator 57 in oil supply unit 2 passes sequentially through the coarse filter 55, the twentieth pipe 611, the switching valve 482, the twenty-first pipe 612, and the tenth pipe 613 into control pump 51. Control pump 51 splits into two paths through the eleventh pipe 624. One path enters the regulating valve 42 of the automatic shift unit 6 through the ninth pipe 635 to control the internal operation of the regulating valve 42 of the automatic shift unit 6. The other path enters the stabilizing valve 481 in control unit 3 through the eighth pipe 625. The stabilizing valve 481 can stabilize the control oil pressure and ensure accurate control pressure.

[0018] The output end of the oil supply unit 2 is connected to the control unit 3, the lubrication unit 4 and the automatic shifting unit 6 respectively to provide transmission oil; Specifically, the oil supply unit 2 includes a driven vent pump 54, an active vent pump 52, an oil supply pump 50, a fine filter 56, a coarse filter 55, and a radiator 57. The input end of the driven vent pump 54 is connected to the oil pan of the mechanical housing via a thirteenth pipe 631; the output end of the driven vent pump 54 is connected to the oil pan of the hydraulic housing via a fourteenth pipe 632; a throttle valve 499 is installed inside the mechanical housing structure, one end of which is connected to the oil pan of the mechanical housing via a fifteenth pipe 633; ​​the other end of the throttle valve 499 is connected to the lubricating oil unit; one end of the fifteenth pipe 633 is connected to one end of the sixteenth pipe 634, and the other end of the sixteenth pipe 634 is connected to the input end of the active vent pump 52, and the output end of the active vent pump 52 is connected via a preset pipe. It is connected to the oil pan of the hydraulic tank; the oil supply pump 50 is installed inside the oil pan of the hydraulic tank, and the output end of the oil supply pump 50 is connected to one end of the radiator 57 through the seventeenth pipe 601. The other end of the radiator 57 is connected to the main control valve 41 through the eighteenth pipe 603; the seventeenth pipe 601 is connected to one end of the nineteenth pipe 614, and the other end of the nineteenth pipe 614 is connected to the regulating valve 42. The switching valve 482 is connected to the eighteenth pipe 603 through the twentieth pipe 611. The fine filter 56 and the coarse filter 55 are installed on the twentieth pipe 611, and the fine filter 56 is located between the coarse filter 55 and the switching valve 482.

[0019] The oil supply process of the system described in this embodiment is as follows: In this embodiment, the transmission oil in the hydraulic transmission box is stored inside the oil pan of the hydraulic transmission box. After the engine starts, the oil supply pump 50 of the oil supply unit 2 immediately draws oil from the oil pan of the hydraulic transmission box. The drawn oil flows through the seventeenth pipe 601 of the oil supply unit 2 to the radiator 57 for cooling. After exiting the radiator 57, the oil flows through the eighteenth pipe 603 to the main control valve 41 of the automatic shift unit 6, waiting for oil filling. During the oil filling process, the mechanical housing oil pan is located at the lowest end of the entire transmission box and has a small volume. When it is full of lubricating oil, it is prone to overflow, requiring continuous pumping of oil from the mechanical housing oil pan back to the hydraulic housing oil pan. When the engine is running, the active venting pump 52 of the oil supply unit 2 operates, drawing lubricating oil from the mechanical housing oil pan through the fifteenth pipe 633 and draining it into the hydraulic housing oil pan through the sixteenth pipe 634. When the engine is not running and the locomotive is being towed, only the driven venting pump 54 of the oil supply unit 2 operates, drawing lubricating oil from the mechanical housing oil pan through the thirteenth pipe 631 and draining it into the hydraulic housing oil pan through the fourteenth pipe 632. When the locomotive is running normally, both the active venting pump 52 and the driven venting pump 54 in the oil supply unit 2 operate. Furthermore, when the transmission is not in operation, the active venting pump 52 connects the hydraulic tank and the mechanical tank oil pan via the fifteenth pipe 633. The hydraulic tank oil pan has a higher oil level than the mechanical tank oil pan. Due to the siphon effect, oil from the hydraulic tank oil pan can easily be drawn into the mechanical tank oil pan. To avoid this siphon effect, the ventilation throttle valve 499 in the oil supply unit 2 is open to atmospheric pressure. Atmospheric pressure acts on the oil surface of both the hydraulic tank and mechanical tank oil pans, preventing oil from the active venting pump 52 and the fifteenth pipe 633 from entering the mechanical tank oil pan. When the transmission is in operation, the ventilation throttle valve 499 in the oil supply unit 2 is closed to atmospheric pressure. The pressurized oil inside the twenty-fourth pipe 630 in the lubrication unit 4 can close it, preventing the active venting pump 52 in the oil supply unit 2 from drawing in air and thus preventing it from drawing in oil.

[0020] The lubrication unit 4 is connected to the control unit 3 to provide lubricating oil; Specifically, the lubrication unit 4 includes an idler pump 53 and a second check valve 483; one end of the idler pump 53 is connected to the tenth pipe 613 through the twenty-first pipe 612, and the other end of the idler pump 53 is connected to the twenty-third pipe 629 through the twenty-second pipe 627. One end of the twenty-third pipe 629 is connected to the twenty-first pipe 612, and the other end of the twenty-third pipe 629 is connected to the lubrication point 58 inside the hydraulic tank structure. The other end of the throttle valve 499 is connected to the twenty-third pipe 629 through the twenty-fourth pipe 630. One end of the twenty-fifth pipe 628 is connected to the twenty-third pipe 629, and the other end of the twenty-fifth pipe 628 is connected to the twenty-first pipe 612. The second check valve 483 is provided on the twenty-fifth pipe 628, and the other end of the stabilizing valve 481 is connected to the twenty-first pipe 612 through the twenty-sixth pipe 626.

[0021] The lubrication process of the system described in this embodiment is as follows: When the engine is idling and the locomotive is stationary, the oil supply pump 50 in the oil supply unit 2 draws lubricating oil from the oil pan of the hydraulic tank and pumps the oil through the seventeenth pipe 601 to the radiator 57. After exiting the radiator 57, the oil flows through the twentieth pipe 611 and the coarse filter 55 in the oil supply unit 2 to the switching valve 482. The oil from the switching valve 482 flows sequentially through the twenty-first pipe 612, the second check valve 483, the twenty-fifth pipe 628, and the twenty-third pipe 629 to the lubrication point 58. At the same time, the control pump 51 in the control unit 3 pumps the drawn oil through the twenty-first pipe 612 and the tenth pipe 613, and then through the eleventh pipe 624 and the eighth pipe 625 to the pressure reducing valve, i.e., the stabilizing valve 481, and finally through the second check valve 483 to the lubrication point 58. In addition, a small portion of the oil coming out of the twentieth pipe 611 will reach the transmission oil fine filter 56 and undergo fine filtration before flowing back to the hydraulic tank oil pan. When the locomotive is moving, the idler pump 53 draws lubricating oil from the hydraulic tank oil pan through the first check valve 511, the twenty-first pipe 612, and the tenth pipe 613, and then transmits the lubricating oil to the lubrication point 58 through the twenty-second pipe 627 and the twenty-third pipe 629. When the engine is stationary and the locomotive is being towed, only the idler pump 53 of the lubrication unit 4 provides lubrication. It draws lubricating oil through the first check valve 511 and the tenth pipe 613 of the control unit 3, and then transmits the lubricating oil to the lubrication point 58 through the twenty-second pipe 627 and the twenty-third pipe 629. The amount of lubricating oil provided by the idler pump 53 of the lubrication unit 4 depends on the vehicle speed.

[0022] The control unit 3 is connected to the lubrication unit 4, the automatic shifting unit 6, and the automatic reversing unit 5, respectively. The control unit 3 is used to automatically shift and reverse the hydraulic transmission box according to the transmission oil supplied by the oil supply unit 2 and the control oil supplied by the lubrication unit 4, through the automatic reversing unit 5 and the automatic shifting unit 6. Specifically: The automatic reversing unit 5 includes a commutator 40 and a sensing valve 44. The commutator 40 has a piston rod 402 with a piston 401 inside, the output end of which is connected to one end of a control lever 403. The other end of the control lever 403 is connected to one end of a gear shift lever 405. The other end of the gear shift lever 405 is connected to a first splined shaft 333 via a ball bearing 334, and the first splined shaft 333 is fitted onto one end of a turbine shaft 33 in the mechanical housing structure. The other end of the turbine shaft 33 is connected to the output end of a rotating device 43. The turbine shaft 33 is arranged inside the mechanical housing structure and the hydraulic housing structure. The sensing valve 44 is connected to a second pipeline 649 via a first pipeline 651. 44 abuts against the end of the intermediate shaft 32 inside the mechanical housing structure; the first spline shaft 333 is provided with a first spline sleeve 331 and a second spline sleeve 332 around its periphery, and the intermediate shaft 32 is provided with a first gear 321 and a second gear 322; the first spline sleeve 331 meshes with the first gear 321, one side of the second spline sleeve 332 meshes with the third gear 311; one side of the second gear 322 meshes with one side of the third gear 311 fixed on the first mechanical shaft 31, and the other side of the third gear 311 meshes with one side of the fourth gear 301 fixed on the second mechanical shaft 30, and the other side of the fourth gear 301 is located inside the oil pan of the mechanical housing.

[0023] The automatic shifting unit 6 includes a main control valve 41 and a regulating valve 42; the main control valve 41 is connected to the starting torque converter 21 inside the hydraulic tank structure through the third pipeline 605 and the fourth pipeline 606, the main control valve 41 is connected to the operating torque converter 22 inside the hydraulic tank structure through the fifth pipeline 607 and the sixth pipeline 608; the main control valve 41 is connected to the regulating valve 42 through the seventh pipeline 636.

[0024] The automatic commutation process of the system described in this embodiment is as follows: When the hydraulic transmission box travels in direction A, the mechanical energy transmission path is as follows: the first spline sleeve 331 meshes with the first spline shaft 333, the first spline sleeve 331 meshes with the first gear 321, since the first gear 321 is fixed on the intermediate shaft 32, the second gear 322 is fixed on the intermediate shaft 32, the second gear 322 meshes with the third gear 311, the third gear 311 meshes with the fourth gear 301, and the fourth gear 301 drives the second mechanical shaft 30 to rotate, thus transmitting energy to the locomotive. When the transmission box travels in direction B, the mechanical energy transmission path is as follows: the first splined shaft 333 meshes with the second splined sleeve 332, the second splined sleeve 332 meshes with the third gear 311, the third gear 311 meshes with the fourth gear 301, and the fourth gear 301 drives the second mechanical shaft 30 to rotate, transmitting energy to the locomotive. The locomotive driver selects the desired direction of travel; the direction operation and display are both implemented by the control unit 3. The direction of locomotive movement determines whether the first splined shaft 333 meshes with the first splined sleeve 331 or the second splined sleeve 332 in the automatic reversing unit 5. The first splined shaft 333 is driven by the piston 401, which in turn drives the piston rod 402, the control lever 403, the gear shift lever 405, and the ball bearing 334.

[0025] In this embodiment, the gearbox reversing needs to meet the following conditions: (1) The intermediate shaft 32 of the automatic reversing unit 5 is stationary; (2) The diesel engine stops working or runs idle.

[0026] (3) The pressure of the first medium pipeline 647, the second medium pipeline 648, the third medium pipeline 653, the first pipeline 651, the second pipeline 649, the first pipeline 652 and the second pipeline 650 is at least 5 bar.

[0027] In this embodiment, once the locomotive issues a reversing command, the fifth gas channel 8 is opened, and compressed air reaches the rotating device 43 and the sensing valve 44 through the second pipeline 649. The sensing pointer 443 is pushed onto the intermediate shaft 32 of the automatic reversing unit 5. If the intermediate shaft 32 is stationary at this time, the sensor pointer 443 is pressing against the intermediate shaft 32. The compressed air from the second pipe 649 to the first pipe 651 will be connected inside the sensor valve 44. The compressed air in the second pipe 649 will reach the fourth gas channel 10 through the first pipe 651. The control unit 3 receives the signal and, when the condition that the intermediate shaft 32 of the automatic reversing unit 5 can be reversed in a stationary state is met, the compressed air will reach the rotating device 43 through the first pipe 652. During the reversing process, there is no tooth-to-tooth phenomenon between the first spline shaft 333 of the automatic reversing unit 5 and the first spline sleeve 331 or the second spline sleeve 332. At this time, the reversing can be carried out smoothly. At this time, if the pressure in the second pipe 650 and the first pipe 652 does not reach the requirement to start the rotating device 43 of the automatic reversing unit 5, the rotating device 43 will not move.

[0028] After receiving the signal from the fourth gas channel 10, the control unit 3 determines the direction of travel based on the driver's selection. For example, if the driver selects direction A, the first gas channel 11 supplies compressed air to the first medium pipeline 647 of the control unit. The piston rod 402 inside the commutator 40 moves upward, causing the control lever 403 to rotate clockwise. The gear shift lever 405, via the ball bearing 334, moves the first spline shaft 333 to the left, where it engages with the second spline sleeve 332. Alternatively, if the driver selects direction B, the fourth gas channel 10 supplies compressed air to the second medium pipeline 648. The piston rod 402 inside the commutator 40 moves downward, causing the control lever 403 to rotate counterclockwise. The gear shift lever 405, via the ball bearing 334, moves the first spline shaft 333 to the right, where it engages with the first spline sleeve 331.

[0029] If the intermediate shaft 32 of the automatic reversing unit 5 remains in motion and cannot be stationary, the sensor pointer 443 is disengaged the moment its end contacts the sensor pointer 443. The sensor valve 44 closes the compressed air passage between the second pipe 649 and the first pipe 651. The fourth gas passage 10 does not receive a signal and cannot meet the reversing conditions, so reversing is not possible. Otherwise, reversing is possible. After reversing begins, if the first spline shaft 333 of the automatic reversing unit 5 is at the tooth tip position with the second spline sleeve 332 or the first spline sleeve 331, reversing cannot proceed smoothly. The pressure in the second pipe 650 and the first pipe 652 of the control unit is higher. At this time, the rotating device 43 of the automatic reversing unit 5 starts to rotate, driving the turbine shaft 33 to rotate, driving the first spline sleeve 333 to rotate at a certain angle, solving the problem of the spline shaft and spline tooth tip, and ensuring that reversing can proceed smoothly.

[0030] The automatic gear shifting process of the system described in this embodiment is as follows: The hydraulic transmission shifts are controlled by the regulating valve 42 of the automatic shift unit 6. The regulating valve 42 determines whether the starting torque converter 21 or the operating torque converter 22 of the automatic shift unit 6 is working based on the current vehicle speed and engine speed. The shift point of the hydraulic transmission must match the engine speed and the vehicle speed to ensure that the engine does not stall or traction is not interrupted during shifting. The turbine shaft 33 of the automatic reversing unit 5 can drive the regulating valve 42 of the automatic shifting unit 6. The rotational speed of the turbine shaft 33 is proportional to the locomotive speed, and the engine speed is proportional to the pressure of the nineteenth pipeline 614 of the fuel supply unit 2. The regulator 42 has an algorithm program that can evaluate the relationship between the pressure of the nineteenth pipeline 614 and the rotational speed of the turbine shaft 33 of the automatic reversing unit 5. The programming method of the algorithm program is a known existing technology, which will not be elaborated here. This determines whether the shifting conditions are met, and then decides whether to connect the ninth pipeline 635 and the seventh pipeline 636.

[0031] If the shifting conditions are met, the ninth pipe 635 and the seventh pipe 636 are connected, and control oil enters the main control valve 41. Then, the second gear oil inlet channel of the main control valve 41 of the automatic shifting unit 6 is opened, the eighteenth pipe 603 of the oil supply unit 2 is connected to the fifth pipe 607 of the automatic shifting unit 6, and the sixth pipe 608 is closed. At this time, the torque converter 22 of the automatic shifting unit 6 is filled with oil. At the same time, the third pipe 605 of the automatic shifting unit 6 is closed, and the fourth pipe 606 of the automatic shifting unit 6 leading to the hydraulic tank oil pan is opened, purging the starting torque converter 21 of the automatic shifting unit 6. At the same time, when the vehicle speed decreases, it will switch back in the reverse order: As the vehicle speed decreases, the regulator 42 of the automatic shift unit 6 prevents the control oil from flowing from the ninth line 635 of the control unit 3 to the seventh line 636 of the automatic shift unit 6. The second gear oil inlet channel of the main control valve 41 is closed, the eighteenth line 603 of the automatic shift unit 6 is disconnected from the fifth line 607, and the sixth line 608 is opened. At this time, the torque converter 22 of the automatic shift unit 6 discharges oil, the first gear oil inlet channel of the main control valve 41 of the automatic shift unit 6 is opened, the starting torque converter 21 of the automatic shift unit 6 begins to fill with oil, and the hydraulic transmission box switches to first gear operation.

[0032] The beneficial effects of the system described in this embodiment are as follows: Through the control unit 3 and the lubrication unit 4, automatic shifting unit 6 and automatic reversing unit 5 connected thereto, and based on the transmission oil provided by the oil supply unit 2 and the control oil provided by the lubrication unit 4, the automatic reversing unit 5 and the automatic shifting unit 6 realize the automatic shifting and automatic reversing operation of the hydraulic transmission box, effectively realizing the efficiency and accuracy of the automatic reversing and automatic shifting control of the hydraulic transmission box, and improving the flexibility of the automatic shifting and reversing of the hydraulic transmission box.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic reversing and automatic shifting control system for a hydraulic transmission box, characterized in that, It includes a locomotive control unit (1), an oil supply unit (2), a control unit (3), a lubrication unit (4), an automatic reversing unit (5), and an automatic gear shifting unit (6). The locomotive control unit (1) is connected to the control unit (3), and the locomotive control unit (1) is used to provide compressed air medium to the control unit (3); The output end of the oil supply unit (2) is connected to the locomotive control unit (3), the lubrication unit (4) and the automatic shifting unit (6) respectively to provide transmission oil; The lubrication unit (4) is connected to the locomotive control unit (3) to provide lubricating oil; The control unit (3) is connected to the lubrication unit (4), the automatic shifting unit (6) and the automatic reversing unit (5) respectively. The control unit (3) is used to realize the automatic shifting and automatic reversing operation of the hydraulic transmission box through the automatic reversing unit (5) and the automatic shifting unit (6) according to the transmission oil provided by the oil supply unit (2) and the lubrication oil provided by the lubrication unit (4).

2. The automatic reversing and automatic shifting control system for a hydraulic transmission box according to claim 1, characterized in that, The automatic commutation unit (5) includes a commutator (40) and a sensing valve (44). The piston rod (402) of the piston (401) inside the commutator (40) is connected to one end of the control lever (403), and the other end of the control lever (403) is connected to one end of the gear shift lever (405); the other end of the gear shift lever (405) is connected to the first spline shaft (333) through a ball bearing (334), and the first spline shaft (333) is sleeved on one end of the turbine shaft (33) in the mechanical housing structure; the other end of the turbine shaft (33) is connected to the output end of the rotating device (43); The turbine shaft (33) is arranged inside the mechanical housing structure and the hydraulic housing structure. The sensing valve (44) is connected to the second pipe (649) through the first pipe (651), and the sensing valve (44) abuts against the end of the intermediate shaft (32) inside the mechanical housing structure. The first spline shaft (333) is provided with a first spline sleeve (331) and a second spline sleeve (332) on its periphery. The intermediate shaft (32) is provided with a first gear (321) and a second gear (322). The first spline sleeve (331) meshes with the first gear (321). One side of the second spline sleeve (332) meshes with the third gear (311). One side of the second gear (322) meshes with one side of the third gear (311) fixed on the first mechanical shaft (31). The other side of the third gear (311) meshes with one side of the fourth gear (301) fixed on the second mechanical shaft (30). The other side of the fourth gear (301) is located inside the oil pan of the mechanical housing.

3. The automatic reversing and automatic shifting control system for a hydraulic transmission box according to claim 2, characterized in that, The automatic shifting unit (6) includes a main control valve (41) and a regulating valve (42). The main control valve (41) is connected to the starting torque converter (21) inside the hydraulic tank structure through the third pipeline (605) and the fourth pipeline (606). The main control valve (41) is connected to the operating torque converter (22) inside the hydraulic tank structure through the fifth pipeline (607) and the sixth pipeline (608). The main control valve (41) is connected to the regulating valve (42) through the seventh pipeline (636).

4. The automatic reversing and automatic shifting control system for a hydraulic transmission box according to claim 3, characterized in that, The control unit (3) includes a locomotive control unit, a control pump (51), a stabilizing valve (481), a switching valve (482), and a first check valve (511). The locomotive control unit (1) is connected to the control unit. The control unit includes a first gas channel (11), a second gas channel (12), a third gas channel (6), a fourth gas channel (10), and a fifth gas channel (8). The first gas channel (11) and the second gas channel (12) are connected to the top and bottom of the gas chamber inside the commutator (40) through a first medium pipeline (647) and a second medium pipeline (648), respectively. The third gas channel (6) is connected to the main control valve (41) through a third medium pipeline (653). The fourth gas channel (10) and the fifth gas channel (8) are connected to the sensing valve (44) through a first pipeline (651) and a second pipeline (649). The first pipeline (651) is provided with a first pipeline (652) for connecting the rotating device (43), and the second pipeline (649) is provided with a second pipeline (650) for connecting the rotating device (43). The first check valve (511) is installed in the oil pan of the hydraulic tank at the bottom of the hydraulic tank structure. One end of the stabilizing valve (481) is connected to the regulating valve (42) through the eighth pipeline (625) and the ninth pipeline (635) in sequence. One end of the control pump (51) is connected to the switching valve (482) through the tenth pipeline (613). One end of the first check valve (511) is connected to the tenth pipeline (613). The other end of the control pump (51) is connected to the ninth pipeline (635) through the eleventh pipeline (624). A twelfth pipeline (638) for connecting the switching valve (482) is provided on the ninth pipeline (635) between the connection end of the eleventh pipeline (624) and the ninth pipeline (635) and the regulating valve (42).

5. The automatic reversing and automatic shifting control system for a hydraulic transmission box according to claim 4, characterized in that, The oil supply unit (2) includes a driven vent pump (54), an active vent pump (52), an oil supply pump (50), a fine filter (56), a coarse filter (55), and a radiator (57). The input end of the driven vent pump (54) is connected to the oil pan of the mechanical housing through the thirteenth pipeline (631); the output end of the driven vent pump (54) is connected to the oil pan of the hydraulic housing through the fourteenth pipeline (632); a throttle valve (499) is provided inside the mechanical housing structure, one end of the throttle valve (499) is connected to the oil pan of the mechanical housing through the fifteenth pipeline (633); the other end of the throttle valve (499) is connected to the lubricating oil unit; one end of the fifteenth pipeline (633) is connected to one end of the sixteenth pipeline (634), and the other end of the sixteenth pipeline (634) is connected to the input end of the active vent pump (52), and the output end of the active vent pump (52) is connected to the oil pan of the hydraulic housing through a preset pipeline; The oil supply pump (50) is installed inside the oil pan of the hydraulic tank. The output end of the oil supply pump (50) is connected to one end of the radiator (57) through the seventeenth pipeline (601). The other end of the radiator (57) is connected to the main control valve (41) through the eighteenth pipeline (603). The seventeenth pipeline (601) is connected to one end of the nineteenth pipeline (614). The other end of the nineteenth pipeline (614) is connected to the regulating valve (42). The switching valve (482) is connected to the eighteenth pipeline (603) through the twentieth pipeline (611). The fine filter (56) and the coarse filter (55) are installed on the twentieth pipeline (611), and the fine filter (56) is located between the coarse filter (55) and the switching valve (482).

6. The automatic reversing and automatic shifting control system for a hydraulic transmission box according to claim 5, characterized in that, The lubrication unit (4) includes an idler pump (53) and a second check valve (483). One end of the inertial pump (53) is connected to the tenth pipe (613) through the twenty-first pipe (612), and the other end of the inertial pump (53) is connected to the twenty-third pipe (629) through the twenty-second pipe (627). One end of the twenty-third pipe (629) is connected to the twenty-first pipe (612), and the other end of the twenty-third pipe (629) is connected to the lubrication point 58 inside the hydraulic tank structure. The other end of the throttle valve (499) is connected to the twenty-third pipe (629) through the twenty-fourth pipe (630). One end of the twenty-fifth pipe (628) is connected to the twenty-third pipe (629), and one end of the twenty-fifth pipe (628) is connected to the twenty-first pipe (612). A second check valve (483) is provided on the twenty-fifth pipe (628), and the other end of the stabilizing valve (481) is connected to the twenty-first pipe (612) through the twenty-sixth pipe (626).

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