Hydraulic transmission box control system for oil-charge braking of reverse part of torque converter

Abstract

Disclosed in the present invention is a hydraulic transmission box control system for oil-charge braking of a reverse part of a torque converter. The control system comprises an air source module, an electronic control valve module, a hydraulic unit of a hydraulic transmission box, and a hydraulic control unit, wherein the electronic control valve module is connected to the air source module, and the hydraulic control unit is connected to the electronic control valve module and is used for acquiring a traction / braking signal of the hydraulic transmission box; and the hydraulic unit is used for implementing an oil-charge / oil-discharge operation of the hydraulic transmission box on the basis of the traction / braking signal. A cooling unit comprises a traction heat exchanger, a three-way transfer valve and a braking heat exchanger, which are connected in sequence. By means of providing a two-position three-way valve and a drainage valve in the control system, full-oil-charge reverse braking of the hydraulic transmission box is changed into partial-oil-charge reverse braking, and the braking heat exchanger is additionally provided, so as to solve the problems of a braking force of a locomotive being too large, the capacity of a heat exchanger of the torque converter being insufficient, and the braking force being easily mastered, thereby making it convenient to operate the braking performance of the hydraulic transmission box of the locomotive, and greatly improving the economical efficiency and the reliability.

Description

A hydraulic transmission control system for torque converter reverse partial oil-filled braking Technical Field

[0001] The present invention relates to the technical field of hydraulic transmission boxes, in particular to a hydraulic transmission box control system for reverse partial oil filling braking of a torque converter. Background Art

[0002] At present, reverse oil-filling braking of torque converters has been applied on locomotives. That is, when the vehicle is traveling forward (direction B) or backward (direction A), the driver directly puts the reversing handle in the opposite position. At this time, starting the torque converter will produce turbine reversal. This phenomenon is called reverse oil-filling braking. At this time, the entire torque converter is filled with oil, especially the centrifugal turbine torque converter, and the braking torque increases rapidly.

[0003] Currently, braking torque is adjusted by adjusting engine speed. However, since braking torque is not very sensitive to changes in engine speed, it is difficult for the driver to control. If the driver is not careful, the braking torque can become very large, overloading the transmission system and seriously compromising driving safety. If the braking force is not controlled and applied directly, the following problems may occur: 1) Excessive braking force can damage transmission system components. 2) Insufficient capacity of the torque converter heat exchanger makes heat dissipation difficult. 3) Difficulty in controlling the braking force can cause braking shock.

[0004] Summary of the Invention

[0005] The present invention provides a hydraulic transmission box control system for reverse partial oil-filling braking of a torque converter to overcome the above technical problems.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] A hydraulic transmission box control system for reverse partial oil-filled braking of a torque converter comprises an air source module, an electro-pneumatic valve module, a cooling unit, a hydraulic unit of the hydraulic transmission box, an oil supply unit and a hydraulic control unit;

[0008] The electro-pneumatic valve module is connected to an air source module for providing a compressed air medium, and the hydraulic control unit is connected to the electro-pneumatic valve module to obtain traction / braking signals from the hydraulic transmission box; the hydraulic control unit includes a two-position three-way valve, a first main control valve, and a second main control valve, each of which is connected to the electro-pneumatic valve module; and the valve control oil inlet of the two-position three-way valve is connected to a control pump that provides control oil for the hydraulic unit and the cooling unit;

[0009] The oil supply unit is connected to the hydraulic unit and the cooling unit respectively, and is used to provide transmission oil to the hydraulic unit;

[0010] The hydraulic unit is connected to the hydraulic control unit, and is used to implement oil filling / draining operations of the hydraulic transmission box according to the traction / braking signals of the hydraulic transmission box;

[0011] The cooling unit includes a traction heat exchanger, a three-way switching valve and a brake heat exchanger which are connected in sequence; the cooling unit is used to cool the hydraulic unit.

[0012] Furthermore, the hydraulic unit includes an A-direction torque converter, a B-direction torque converter, a first relief valve, and a second relief valve;

[0013] The oil inlet a3 of the torque converter in the A-direction direction is connected to the transmission oil outlet c1 of the first main control valve, the oil discharge port a2 of the torque converter in the A-direction direction is connected to the transmission oil inlet c3 of the first main control valve, the oil drain port a1 of the torque converter in the A-direction direction is connected to the transmission oil inlet a2 of the first drain valve, and the oil inlet b3 of the torque converter in the B-direction direction is connected to the transmission oil outlet b1 of the second main control valve;

[0014] The oil drain port b2 of the B-direction torque converter is connected to the transmission oil inlet b3 of the second main control valve, the oil drain port b1 of the B-direction torque converter is connected to the transmission oil inlet b2 of the second relief valve, the drain oil passage a3 of the first relief valve and the drain oil passage b3 of the second relief valve are connected to the oil supply unit through the pipeline inside the hydraulic transmission box; and the control oil inlet a1 of the first relief valve is connected to the control oil inlet b1 of the second relief valve and the control oil inlet a3 of the three-way switching valve, and the control oil inlet a3 of the three-way switching valve is also connected to the two-position three-way valve.

[0015] Furthermore, the oil supply unit includes an oil supply pump and an oil tank;

[0016] The oil supply pump is connected to the transmission oil inlet c1 of the traction heat exchanger, the transmission oil outlet c2 of the traction heat exchanger is connected to the transmission oil inlet a1 of the three-way switching valve, the transmission oil outlet a2 of the three-way switching valve is connected to the transmission oil inlet b1 of the brake heat exchanger, and the transmission oil outlet b2 of the brake heat exchanger is respectively connected to the transmission oil inlet c2 of the first main control valve and the transmission oil inlet b2 of the second main control valve.

[0017] Furthermore, the two-position three-way valve includes a valve air source inlet, a valve control oil inlet and a valve control oil outlet;

[0018] The outlet a1 of the control pump is connected to the valve control oil inlet, the valve air source inlet is connected to the electro-pneumatic valve module, and the valve control oil outlet is connected to the control oil inlet of the three-way switching valve.

[0019] Furthermore, the method for implementing the oil filling / draining operation of the hydraulic transmission box by the hydraulic unit according to the traction / braking signal of the hydraulic transmission box is as follows:

[0020] S1: First, set the torque converter in direction A as the traction torque converter; set the torque converter in direction B as the reverse torque converter;

[0021] Turn on the control pump and activate the first main control valve through the electro-pneumatic valve module to make the valve core of the first main control valve slide down; and the two-position three-way valve is in the reset state, and the valve control oil inlet and the valve control oil outlet are connected;

[0022] The control pump extracts control oil from the oil supply unit and transmits it to the first relief valve and the second relief valve to keep them in a reset state; and the control oil drives the three-way switching valve to isolate the traction heat exchanger from the brake heat exchanger;

[0023] S2: The transmission oil in the oil pool is driven by the oil supply pump to flow through the traction heat exchanger and then to the first main control valve. The first main control valve is driven by the electro-pneumatic valve module to transmit the transmission oil to the torque converter in the A direction to realize the oil filling operation;

[0024] S3: When braking is required, the locomotive steering handle is placed in the reverse position, the first main control valve is disconnected through the electro-pneumatic valve module, and the transmission oil in the torque converter in direction A is discharged to the oil supply unit through the first main control valve; and the second main control valve and the two-position three-way valve are opened;

[0025] The compressed air in the air source module enters the second main control valve through the electro-pneumatic valve module, driving the valve core of the second main control valve to descend. At the same time, the valve core of the two-position three-way valve moves toward one end, isolating the control oil outlet a1 of the control pump from the valve control oil inlet of the two-position three-way valve. The valve control oil outlet is connected to the oil tank outlet of the oil supply unit, completely draining the control oil remaining in the two-position three-way valve, the three-way transfer valve, the first drain valve, and the second drain valve.

[0026] S4: As the control oil in the control oil inlet a3 of the three-way transfer valve is drained, the three-way transfer valve is reset and the transmission oil inlet a1 of the three-way transfer valve is connected to the transmission oil outlet a2, so that the traction heat exchanger and the brake heat exchanger are connected;

[0027] The oil supply pump of the oil supply unit draws transmission oil from the oil pool, and the oil flows through the traction heat exchanger and the brake heat exchanger in sequence before reaching the second main control valve. The valve core of the second main control valve slides down so that the transmission oil outlet b1 of the second main control valve communicates with the transmission oil inlet b2 of the second main control valve.

[0028] The transmission oil outlet b2 of the brake heat exchanger is connected to the transmission oil inlet b2 of the second main control valve, and the transmission oil outlet b1 of the second main control valve is connected to the transmission oil inlet b3 of the B-direction torque converter, so that the transmission oil enters the B-direction torque converter and starts the oil filling operation;

[0029] S5: The oil drain port b1 of the B-direction torque converter is connected to the transmission oil inlet b2 of the second relief valve. The transmission oil in the B-direction torque converter enters the second relief valve and pushes the valve core of the second relief valve to move toward one end of the second relief valve, so that the transmission oil inlet b2 of the second relief valve is connected to the drain oil passage b3 of the second relief valve.

[0030] Part of the transmission oil in the B-direction torque converter is discharged into the oil pool of the oil supply unit to achieve the operation of partial oil filling and reverse braking of the hydraulic transmission box.

[0031] Beneficial effects: The present invention discloses a hydraulic transmission case control system for partial oil-filled reverse braking of a torque converter. By arranging a two-position three-way valve and a hydraulic unit in the control system, the full oil-filled reverse braking of the hydraulic transmission case is changed to partial oil-filled reverse braking, and a brake heat exchanger is additionally provided. The traction heat exchanger and the brake heat exchanger are connected in series through a three-way switching valve, which greatly enhances the heat dissipation capacity of the locomotive during braking, solves the problems of excessive braking force, insufficient capacity of the torque converter heat exchanger, and difficulty in controlling the braking force, makes the braking performance of the locomotive hydraulic transmission case easy to operate, and greatly improves the economy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0033] FIG1 is a schematic diagram of the system structure of a hydraulic transmission box control system for reverse partial oil-filled braking of a torque converter according to the present invention.

[0034] In the figure: 1. Air source module; 2. Electro-pneumatic valve module; 3. Cooling unit; 31. Traction heat exchanger; 32. Three-way transfer valve; 33. Braking heat exchanger; 4. Hydraulic unit; 41. A-axis torque converter; 410. First starting torque converter; 411. First operating torque converter; 42. B-axis torque converter; 420. Second starting torque converter; 421. Second operating torque converter; 43. First relief valve; 44. Second relief valve; 5. Oil supply unit; 51. Oil supply pump; 52. Oil pool; 6. Hydraulic control unit; 61. Two-position three-way valve; 611. Valve air source inlet; 612. Valve control oil inlet; 613. Valve control oil outlet; 614. Third oil pool outlet; 62. First main control valve; 621. First oil pool outlet; 63. Second main control valve; 631. Second oil pool outlet; 64. Control pump. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] This embodiment provides a hydraulic transmission case control system for reverse partial oil-filled braking of a torque converter, as shown in FIG1 , comprising an air source module 1 , an electro-pneumatic valve module 2 , a cooling unit 3 , a hydraulic unit 4 of the hydraulic transmission case, an oil supply unit 5 , and a hydraulic control unit 6 ;

[0037] The electro-pneumatic valve module 2 is connected to the air source module 1 for providing compressed air, and the hydraulic control unit 6 is connected to the electro-pneumatic valve module 2 for obtaining traction / braking signals from the hydraulic transmission box. The hydraulic control unit 6 includes a two-position three-way valve 61, a first main control valve 62, and a second main control valve 63, each connected to the electro-pneumatic valve module 2. The valve control oil inlet 612 of the two-position three-way valve 61 is connected to a control pump 64 that provides control oil to the hydraulic unit 4 and the cooling unit 3.

[0038] The oil supply unit 5 is connected to the hydraulic unit 4 and the cooling unit 3 respectively, and the oil supply unit 5 is used to provide transmission oil to the hydraulic unit 4;

[0039] The hydraulic unit 4 is connected to the hydraulic control unit 6, and the hydraulic unit 4 is used to realize the oil filling / draining operation of the hydraulic transmission box according to the traction / braking signal of the hydraulic transmission box;

[0040] The cooling unit 3 includes a traction heat exchanger 31 , a three-way switching valve 32 and a brake heat exchanger 33 which are connected in sequence; the cooling unit 3 is used to cool the hydraulic unit 4 .

[0041] The present embodiment discloses a hydraulic transmission case control system for reverse partial oil-filling braking of a torque converter. By arranging a two-position three-way valve and a hydraulic unit (A-direction torque converter, B-direction torque converter, a first relief valve, and a second relief valve) in the control system, the fully oil-filled reverse braking of the hydraulic transmission case is converted to a partially oil-filled reverse braking. In addition, a brake heat exchanger is additionally provided, and the traction heat exchanger and the brake heat exchanger are connected in series through a three-way switching valve, which greatly enhances the heat dissipation capacity during locomotive braking, solves the problems of excessive braking force, insufficient capacity of the torque converter heat exchanger, and difficulty in controlling the braking force, and makes the braking performance of the locomotive hydraulic transmission case easy to operate, and greatly improves both the economy and reliability.

[0042] In a specific embodiment, the hydraulic unit 4 includes an A-direction torque converter 41, a B-direction torque converter 42, a first relief valve 43, and a second relief valve 44; wherein the A-direction torque converter 41 includes a first starting torque converter 410 and a first operating torque converter 411; and the B-direction torque converter 42 includes a second starting torque converter 420 and a second operating torque converter 421; and the principles of each starting torque converter and the operating torque converter are the same, only when the A-direction torque converter 41 and the B-direction torque converter 42 are filled with oil, the size and performance of the mechanical device are used to achieve different gear changes. The mechanical device is a prior art known in the art and is not the invention of this application, and will not be described in detail here.

[0043] The oil inlet a3 of the first starting torque converter 410 of the A-direction torque converter 41 is connected to the transmission oil outlet c1 of the first main control valve 62, the oil discharge port a2 of the first starting torque converter 410 is connected to the transmission oil inlet c3 of the first main control valve 62, the oil drain port a1 of the first starting torque converter 410 is connected to the transmission oil inlet a2 of the first relief valve 43, and the oil inlet b3 of the second starting torque converter 420 of the B-direction torque converter 42 is connected to the transmission oil outlet b1 of the second main control valve 63;

[0044] The oil drain port b2 of the second starting torque converter 420 is connected to the transmission oil inlet b3 of the second main control valve 63, the oil drain port b1 of the second starting torque converter 420 is connected to the transmission oil inlet b2 of the second relief valve 44, the drain oil passage a3 of the first relief valve 43 and the drain oil passage b3 of the second relief valve 44 are connected to the oil supply unit 5 through the pipeline inside the hydraulic transmission box; and the control oil inlet a1 of the first relief valve 43 is connected to the control oil inlet b1 of the second relief valve 44 and the control oil inlet a3 of the three-way switching valve 32, and the control oil inlet a3 of the three-way switching valve 32 is also connected to the two-position three-way valve 61.

[0045] In a specific embodiment, the oil supply unit 5 includes an oil supply pump 51 and an oil pool 52;

[0046] The oil supply pump 51 is connected to the transmission oil inlet c1 of the traction heat exchanger 31, the transmission oil outlet c2 of the traction heat exchanger 31 is connected to the transmission oil inlet a1 of the three-way switching valve 32, the transmission oil outlet a2 of the three-way switching valve 32 is connected to the transmission oil inlet b1 of the brake heat exchanger 33, and the transmission oil outlet b2 of the brake heat exchanger 33 is respectively connected to the transmission oil inlet c2 of the first main control valve 62 and the transmission oil inlet b2 of the second main control valve 63.

[0047] In a specific embodiment, the two-position three-way valve 61 includes a valve air source inlet 611, a valve control oil inlet 612 and a valve control oil outlet 613;

[0048] The outlet a1 of the control pump 64 is connected to the valve control oil inlet 612, the valve air source inlet 611 is connected to the electro-pneumatic valve module 2, and the valve control oil outlet 613 is connected to the control oil inlet a3 of the three-way switching valve 32. The electro-pneumatic valve module 2 transmits air source medium to the valve air source inlet 611 of the two-position three-way valve 61, and the air pressure causes the valve core of the two-position three-way valve 61 to reciprocate. The control pump 64 supplies control oil to the first and second relief valves 43, 44 of the hydraulic unit 4 and the cooling unit 3 through the two-position three-way valve 61.

[0049] In a specific embodiment, the method for implementing the oil filling / draining operation of the hydraulic transmission box by the hydraulic unit 4 according to the traction / braking signal of the hydraulic transmission box is as follows;

[0050] According to the operation process of the locomotive, the torque converter 41 in the direction of A is set as a traction torque converter or a reverse torque converter, and the torque converter in the direction of B is set as a reverse torque converter or a traction torque converter, so as to realize the oil filling / draining operation of the hydraulic transmission box according to the traction / brake signal of the hydraulic transmission box, and realize the braking operation of the reverse part of the hydraulic transmission box torque converter;

[0051] S1: First, set the A-direction torque converter 41 as a traction torque converter; set the B-direction torque converter 42 as a reverse torque converter;

[0052] The control pump 64 is turned on, and the first main control valve 62 is activated through the electro-pneumatic valve F4 of the electro-pneumatic valve module 2, so that the valve core of the first main control valve 62 slides down; the two-position three-way valve 61 is in the reset state, and the valve control oil inlet 612 and the valve control oil outlet 613 are connected;

[0053] The control pump 64 extracts control oil from the oil supply unit 5 and transmits it to the first relief valve 43 and the second relief valve 44 to keep them in a reset state; and the control oil drives the three-way switching valve 32 to isolate the traction heat exchanger 31 from the brake heat exchanger 33;

[0054] S2: The transmission oil in the oil pool 52 is driven by the oil supply pump 51 to flow through the traction heat exchanger 31 and then to the first main control valve 62. The first main control valve 62 is driven by the electro-pneumatic valve module 2 to transfer the transmission oil to the torque converter 41 in the A direction to realize the oil filling operation;

[0055] S3: When braking operation is required, the locomotive steering handle is placed in the B direction (reverse) position. Under the action of the existing locomotive electronic control device, the first main control valve 62 is disconnected through the electro-pneumatic valve F4 of the electro-pneumatic valve module 2, so that the transmission oil in the A direction torque converter 41 is discharged into the oil pool of the oil supply unit 5 through the first oil pool discharge port 621 of the first main control valve 62 (similarly, if the A direction torque converter 41 is set as a reverse torque converter; the B direction torque converter 42 is set as a traction torque converter, the second main control valve 63 is disconnected through the electro-pneumatic valve module 2 here, so that the transmission oil in the B direction torque converter 42 is discharged into the oil pool of the oil supply unit 5 through the second oil pool discharge port 631 of the second main control valve 63); and the second main control valve 63 is opened through the electro-pneumatic valve F1 of the electro-pneumatic valve module 2, and the two-position three-way valve 61 is opened through the electro-pneumatic valve F3 of the electro-pneumatic valve module 2;

[0056] The compressed air in the air source module 1 enters the second main control valve 63 through the electro-pneumatic valve module 2, driving the valve core of the second main control valve 63 to slide downward; at the same time, the valve core of the two-position three-way valve 61 moves toward one end, and the control oil outlet a1 of the control pump 64 is isolated from the valve control oil inlet 612 of the two-position three-way valve 61. The valve control oil outlet 613 is connected to the third oil discharge pool port 614, and is connected to the oil tank outlet of the oil supply unit 5 through the third oil discharge pool port 614, thereby completely draining the control oil remaining in the two-position three-way valve 61, the three-way transfer valve 32, the first drain valve 43, and the second drain valve 44.

[0057] S4: As the control oil in the control oil inlet a3 of the three-way switching valve 32 is drained, the three-way switching valve 32 is reset and the transmission oil inlet a1 of the three-way switching valve 32 is connected to the transmission oil outlet a2, so that the traction heat exchanger 31 is connected to the brake heat exchanger 33;

[0058] The oil supply pump 51 of the oil supply unit 5 draws transmission oil from the oil pool 52, and the oil flows through the traction heat exchanger 31 and the brake heat exchanger 33 in sequence before reaching the second main control valve 63. The valve core of the second main control valve 63 slides downward, so that the transmission oil outlet b1 of the second main control valve 63 is connected to the transmission oil inlet b2 of the second main control valve 63.

[0059] The transmission oil outlet b2 of the brake heat exchanger 33 is connected to the transmission oil inlet b2 of the second main control valve 63, and the transmission oil outlet b1 of the second main control valve 63 is connected to the transmission oil inlet b3 of the B-direction torque converter 42, so that the transmission oil enters the B-direction torque converter 42 and begins the oil filling operation. When the locomotive is traction, only the traction heat exchanger is in operation. When braking, the traction heat exchanger and the brake heat exchanger are used in series to enhance the heat dissipation effect and effectively ensure the heat dissipation capacity of the locomotive during braking.

[0060] S5: The oil drain port b1 of the B-direction torque converter 42 is connected to the transmission oil inlet b2 of the second relief valve 44. The transmission oil in the B-direction torque converter 42 enters the second relief valve 44 and pushes the valve core of the second relief valve 44 to move toward one end of the second relief valve 44, so that the transmission oil inlet b2 of the second relief valve 44 is connected to the drain oil passage b3 of the second relief valve 44.

[0061] Part of the transmission oil in the B-direction torque converter 42 is discharged into the oil pool 52 of the oil supply unit 5 to achieve the operation of partial oil filling and reverse braking of the hydraulic transmission box.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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. A hydraulic transmission box control system for reverse partial oil filling braking of a torque converter, characterized in that: It comprises an air source module (1), an electric pneumatic valve module (2), a cooling unit (3), a hydraulic unit (4) of a hydraulic transmission box, an oil supply unit (5) and a hydraulic control unit (6); The electro-pneumatic valve module (2) is connected to a wind source module (1) for providing a compressed air medium, and the hydraulic control unit (6) is connected to the electro-pneumatic valve module (2) for obtaining a traction / braking signal of a hydraulic transmission box; the hydraulic control unit (6) comprises a two-position three-way valve (61), a first main control valve (62) and a second main control valve (63) respectively connected to the electro-pneumatic valve module (2); and the valve control oil inlet (612) of the two-position three-way valve (61) is connected to a control pump (64) for providing control oil to the hydraulic unit (4) and the cooling unit (3); The oil supply unit (5) is connected to the hydraulic unit (4) and the cooling unit (3) respectively, and the oil supply unit (5) is used to provide transmission oil to the hydraulic unit (4); The hydraulic unit (4) is connected to a hydraulic control unit (6), and the hydraulic unit (4) is used to implement oil filling / oil draining operations of the hydraulic transmission box according to a traction / braking signal of the hydraulic transmission box; The cooling unit (3) comprises a traction heat exchanger (31), a three-way switching valve (32) and a brake heat exchanger (33) which are connected in sequence; the cooling unit (3) is used to perform a temperature reduction operation on the hydraulic unit (4).

2. A torque converter reverse partial oil-filled braking hydraulic transmission box control system according to claim 1, characterized in that: The hydraulic unit (4) comprises an A-direction torque converter (41), a B-direction torque converter (42), a first leakage valve (43) and a second leakage valve (44); The oil inlet a3 of the A-direction torque converter (41) is connected to the transmission oil outlet c1 of the first main control valve (62), the oil discharge port a2 of the A-direction torque converter (41) is connected to the transmission oil inlet c3 of the first main control valve (62), the oil drain port a1 of the A-direction torque converter (41) is connected to the transmission oil inlet a2 of the first drain valve (43), and the oil inlet b3 of the B-direction torque converter (42) is connected to the transmission oil outlet b1 of the second main control valve (63); The oil discharge port b2 of the B-direction torque converter (42) is connected to the transmission oil inlet b3 of the second main control valve (63), the oil discharge port b1 of the B-direction torque converter (42) is connected to the transmission oil inlet b2 of the second relief valve (44), the drain oil passage a3 of the first relief valve (43) and the drain oil passage b3 of the second relief valve (44) are connected to the oil supply unit (5) through a pipeline inside the hydraulic transmission box; and the control oil inlet a1 of the first relief valve (43) and the control oil inlet b1 of the second relief valve (44) are connected to the control oil inlet a3 of the three-way switching valve (32), and the control oil inlet a3 of the three-way switching valve (32) is also connected to the two-position three-way valve (61).

3. A hydraulic transmission box control system for reverse partial oil-filled braking of a torque converter according to claim 2, characterized in that: The oil supply unit (5) comprises an oil supply pump (51) and an oil pool (52); The oil supply pump (51) is connected to the transmission oil inlet c1 of the traction heat exchanger (31), and the transmission oil outlet c2 of the traction heat exchanger (31) is connected to the transmission oil inlet a1 of the three-way switching valve (32). The transmission oil outlet a2 of the three-way switching valve (32) is connected to the transmission oil inlet b1 of the brake heat exchanger (33), and the transmission oil outlet b2 of the brake heat exchanger (33) is respectively connected to the transmission oil inlet c2 of the first main control valve (62) and the transmission oil inlet b2 of the second main control valve (63).

4. A hydraulic transmission box control system for reverse partial oil-filled braking of a torque converter according to claim 3, characterized in that: The two-position three-way valve (61) comprises a valve air source inlet (611), a valve control oil inlet (612) and a valve control oil outlet (613); The outlet a1 of the control pump (64) is connected to the valve control oil inlet (612), the valve air source inlet (611) is connected to the electro-pneumatic valve module (2), and the valve control oil outlet (613) is connected to the control oil inlet a3 of the three-way switching valve (32).

5. A hydraulic transmission case control system for reverse partial oil-filled braking of a torque converter according to claim 4, characterized in that: The method for implementing the hydraulic unit (4) to realize the oil filling / draining operation of the hydraulic transmission box according to the traction / braking signal of the hydraulic transmission box is as follows: S1: First, set the A-direction torque converter (41) as a traction torque converter; set the B-direction torque converter (42) as a reverse torque converter; The control pump (64) is turned on, and the first main control valve (62) is started through the electro-pneumatic valve module (2) so that the valve core of the first main control valve (62) slides down; and the two-position three-way valve (61) is in a reset state, and the valve control oil inlet (612) and the valve control oil outlet (613) are connected; The control oil is extracted from the oil supply unit (5) by a control pump (64) and transmitted to the first drain valve (43) and the second drain valve (44) to keep them in a reset state; and the control oil drives the three-way switching valve (32) to isolate the traction heat exchanger (31) from the brake heat exchanger (33); S2: The transmission oil in the oil pool (52) is driven by the oil supply pump (51) to flow through the traction heat exchanger (31), and then transmitted to the first main control valve (62), and the first main control valve (62) is driven by the electro-pneumatic valve module (2) to transmit the transmission oil to the A-direction torque converter (41) to realize the oil filling operation; S3: When braking operation is required, the locomotive steering handle is placed in the backward position, and the first main control valve (62) is disconnected through the electric pneumatic valve module (2), so that the transmission oil in the A-direction torque converter (41) is discharged to the oil supply unit (5) through the first main control valve (62); and the second main control valve (63) and the two-position three-way valve (61) are opened; The compressed air in the air source module (1) enters the second main control valve (63) through the electro-pneumatic valve module (2), driving the valve core of the second main control valve (63) to slide down; at the same time, the valve core of the two-position three-way valve (61) moves toward one end, the control oil outlet a1 of the control pump (64) and the valve control oil inlet (612) of the two-position three-way valve (61) are cut off, and the valve control oil outlet (613) is connected to the outlet of the oil supply unit (5) into the oil tank, so that the control oil remaining in the two-position three-way valve (61), the three-way switching valve (32), the first drain valve (43) and the second drain valve (44) is completely drained; S4: As the control oil in the control oil inlet a3 of the three-way switching valve (32) is drained, the three-way switching valve (32) is reset and the transmission oil inlet a1 of the three-way switching valve (32) is connected to the transmission oil outlet a2, so that the traction The heat introduction exchanger (31) is in communication with the brake heat exchanger (33); The oil supply pump (51) of the oil supply unit (5) extracts the transmission oil from the oil pool (52), and the oil flows through the traction heat exchanger (31) and the brake heat exchanger (33) in sequence before reaching the second main control valve (63), and the valve core of the second main control valve (63) slides down so that the transmission oil outlet b1 of the second main control valve (63) communicates with the transmission oil inlet b2 of the second main control valve (63); The transmission oil outlet b2 of the brake heat exchanger (33) is communicated with the transmission oil inlet b2 of the second main control valve (63), and the transmission oil outlet b1 of the second main control valve (63) is communicated with the transmission oil inlet b3 of the B-direction torque converter (42), so that the transmission oil enters the B-direction torque converter (42) and starts the oil filling operation; S5: the oil drain port b1 of the B-direction torque converter (42) is communicated with the transmission oil inlet b2 of the second leakage valve (44), the transmission oil in the B-direction torque converter (42) enters the second leakage valve (44), and pushes the valve core of the second leakage valve (44) to move toward one end of the second leakage valve (44), so that the transmission oil inlet b2 of the second leakage valve (44) is communicated with the drain oil passage b3 of the second leakage valve (44); Part of the transmission oil in the B-direction torque converter (42) is discharged into the oil pool (52) of the oil supply unit (5) to achieve the operation of partially filling the hydraulic transmission box with oil for reverse braking.

Images