A two-stage pressure regulating control structure of a hydraulic transmission oil pressure for a rail transmission

Abstract

The application provides a hydraulic transmission oil pressure two-stage pressure regulating control structure for a track transmission, which comprises a main oil pressure regulating valve body, a regulating valve core assembly is sleeved in the main oil pressure regulating valve body, and a pressure regulating valve plug is arranged at the end of the regulating valve core assembly; an oil inlet is formed on the main oil pressure regulating valve body and close to the end of the regulating valve core assembly, an oil outlet is formed close to the oil inlet, the regulating valve core assembly can be moved to open and close the oil inlet and the oil outlet, and two oil inlets form two oil chambers in the main oil pressure regulating valve body respectively. The application can effectively solve the problem of excessive impact of the existing track engineering vehicle at starting or gear shifting, and achieve the purpose of smooth gear shifting; the application can effectively improve the comfort of the track engineering vehicle, realize two-stage pressure regulating at the moment of starting and gear shifting, reduce the main oil pressure by the main oil pressure regulating valve, and meet the matching and stability of the working pressure and the external load, so that the oil pressure of the gear clutch is smoothly established, and the impact and dynamic load in the starting and gear shifting process are reduced.

Description

Technical Field

[0001] This invention relates to a two-stage hydraulic pressure regulation control structure for a rail transmission. Background Technology

[0002] Currently, the main oil pressure regulation of hydraulic transmissions used in rail vehicles still adopts a single-stage pressure regulation control structure. This type of pressure regulation control structure results in a very short clutch engagement time during gear shifting, leading to large shift shocks, poor shift buffering, and poor user comfort. The existing single-stage pressure regulation technology of the main oil pressure regulating valve has shortcomings: the main pressure enters the cavity within the main oil pressure regulating valve body, and the oil pressure passes through the cavity into the main oil pressure regulating valve core, pushing the steel ball in the valve core to move. The pressurized oil flows through the damping orifice into the cavity within the valve body, and some oil returns to the oil pan through the drain port. The oil pressure at the cavity end face pushes the steel ball in the valve core to the right, and the pressurized oil passes through the cavity into the torque converter and lubrication circuit. Because of the single-stage pressure regulation, the oil leakage and return speeds during shifting are too fast, resulting in high main oil pressure and large shift shocks.

[0003] A typical example is a hydraulically controlled steam turbine overspeed trip valve disclosed in Chinese invention patent application number CN202221935407.X, which uses a single-stage pressure regulation and cannot solve the problem of excessive shock during starting or shifting, thus failing to achieve the purpose of smooth shifting. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a two-stage hydraulic pressure regulation control structure for a rail transmission. This two-stage hydraulic pressure regulation control structure can effectively solve the problem of excessive shock during starting or shifting of existing rail engineering vehicles, and achieve the purpose of smooth shifting.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides a two-stage hydraulic pressure regulation control structure for a rail transmission, comprising a main hydraulic pressure regulating valve body, wherein a regulating valve core assembly is fitted inside the main hydraulic pressure regulating valve body, and a pressure regulating valve plug is provided at the end of the regulating valve core assembly; an oil inlet is opened on the main hydraulic pressure regulating valve body near the end of the regulating valve core assembly, and an oil outlet is opened near the oil inlet; the movement of the regulating valve core assembly can open and close the oil inlet and the oil outlet; the two oil inlets respectively form two oil chambers within the main hydraulic pressure regulating valve body.

[0007] The regulating valve core assembly is fitted with a stop sleeve and a spring. The stop sleeve is fixed relative to the regulating valve core assembly, and the end of the spring is fixed to the stop sleeve and the main oil pressure regulating valve body.

[0008] The oil inlet and oil outlet each have two outlets.

[0009] One of the oil drain ports is located outside the end of the regulating valve core assembly, and the other is located in the middle of the regulating valve core assembly.

[0010] The oil inlet and oil outlet face the same direction and are both perpendicular to the side wall of the main oil pressure regulating valve body.

[0011] A torque converter oil outlet is also provided between the two oil inlets, and this oil outlet is connected to the oil chamber corresponding to at least one of the oil inlets.

[0012] A set screw is also provided on the side of the main oil pressure regulating valve body to limit and lock the regulating valve core assembly.

[0013] The main oil pressure regulating valve body has an opening at one end of the regulating valve core assembly, allowing the regulating valve core assembly to be removed. A pressure regulating valve plug is installed at the end of the regulating valve core assembly at this opening.

[0014] The pressure regulating valve plug is made of alloy structural steel.

[0015] The beneficial effects of this invention are as follows: it effectively solves the problem of excessive shock during starting or shifting in existing rail engineering vehicles, achieving smooth shifting; it effectively improves the user comfort of rail engineering vehicles by achieving two-stage pressure regulation during starting and shifting, with the main oil pressure regulating valve reducing the main oil pressure and ensuring that the working pressure matches and remains stable with the external load, allowing the gear clutch oil pressure to be established smoothly, reducing shock and dynamic load during starting and shifting; it ensures that the impact of instantaneous backflow of the main oil pressure in the hydraulic system during oil discharge is reduced, preventing overload of the hydraulic system, ensuring stable main oil pressure in each system, and making each signal valve work smoothly, thus improving the shifting quality and reliability of the hydraulic transmission used in rail gearboxes. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of at least one embodiment of the present invention;

[0017] Figure 2 yes Figure 1 Schematic diagram of the structure of the pressure regulating valve plug;

[0018] Figure 3 This is a schematic diagram of the hydraulic principle in at least one embodiment of the present invention.

[0019] In the diagram: 1-Regulating valve core assembly, 2-Main oil pressure regulating valve body, 3-Stop sleeve, 4-Setting screw, 5-Spring, 6-Adjusting plate, 7-Pressure regulating valve plug, 8-Washer, 9-Pressure regulating valve plug. Detailed Implementation

[0020] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0021] Example 1

[0022] like Figure 1 , Figure 2 The diagram illustrates a two-stage hydraulic pressure regulation control structure for a rail transmission, comprising a main hydraulic pressure regulating valve body 2. The main hydraulic pressure regulating valve body 2 houses a regulating valve core assembly 1, with a pressure regulating valve plug 7 at one end. An oil inlet is located near the end of the regulating valve core assembly 1 on the main hydraulic pressure regulating valve body 2, and an oil outlet is located near the oil inlet. Movement of the regulating valve core assembly 1 allows the oil inlet and outlet to open and close. The two oil inlets respectively form two oil chambers within the main hydraulic pressure regulating valve body 2.

[0023] Example 2

[0024] Based on Embodiment 1, the regulating valve core assembly 1 is fitted with a stop sleeve 3 and a spring 5. The stop sleeve 3 is fixed relative to the regulating valve core assembly 1, and the end of the spring 5 is fixed to the stop sleeve 3 and the main oil pressure regulating valve body 2.

[0025] Example 3

[0026] Based on Example 1, both the oil inlet and the oil outlet have two paths.

[0027] Example 4

[0028] Based on embodiment 3, one of the oil drain ports is located outside the end of the regulating valve core assembly 1, and the other is located in the middle of the regulating valve core assembly 1.

[0029] Example 5

[0030] Based on Embodiment 1, the oil inlet and oil outlet face the same direction and are both perpendicular to the side wall of the main oil pressure regulating valve body 2.

[0031] Example 6

[0032] Based on Embodiment 1, a torque converter oil outlet is also provided between the two oil inlets, and the oil outlet is connected to the oil chamber corresponding to at least one of the oil inlets.

[0033] Example 7

[0034] Based on Embodiment 1, a set screw 4 is also provided on the side of the main oil pressure regulating valve body 2 for limiting and locking the regulating valve core assembly 1.

[0035] Example 8

[0036] Based on Embodiment 1, the main oil pressure regulating valve body 2 has an opening at one end of the regulating valve core assembly 1 so that the regulating valve core assembly 1 can be removed, and a pressure regulating valve plug 9 is installed at the end of the regulating valve core assembly 1 at the opening.

[0037] Generally, the pressure regulating valve plug 7 is made of alloy structural steel.

[0038] like Figure 1 As shown, the main principle of this invention is as follows: the main oil pressure from the oil pump enters the main oil pressure regulating valve through oil circuit A. When the main oil pressure reaches a certain level, it pushes the steel ball in the center hole of the valve core, and flows into the left end C cavity of the valve core through the damping orifice. The force of the pressurized oil acting on the annular area pushes the valve core and spring to move to the right, connecting cavities B and D. The pressurized oil goes to the hydraulic torque converter and lubrication circuit through cavity D. The movement of the valve core causes the oil pressure to flow out from the drain port. The pressure from the Pitot tube enters the lock-up valve, and the oil pressure pushes the lock-up valve. The movement of the piston core allows the main hydraulic oil from the main hydraulic pressure regulating valve, which was previously destined for the lock-up valve, to enter the shift unlock valve. Under the action of the boost signal, the main hydraulic pressure enters the valve plug position of the main hydraulic pressure regulating valve body, pushing the pressure regulating valve plug to the left. The optimized structure of the pressure regulating valve plug adds a slot, connecting the F chamber to the left-end drain chamber. This increases the main hydraulic pressure drain in the oil circuit, ensuring an effective reduction in main hydraulic pressure. The thrust generated by the hydraulic pressure overcomes the spring force, pushing the pressure regulating valve plug to the right to return to its original position, thus achieving two-stage pressure regulation control of the hydraulic transmission oil pressure. This ensures constant main hydraulic pressure in the operating system, normal torque converter oil supply, and normal lubrication pressure and flow.

[0039] Example 9

[0040] Based on the above embodiments, such as Figure 3 As shown, the hydraulic transmission of the rail gearbox uses a two-stage hydraulic pressure regulation control structure. The main pressure regulating valve, lock-up valve, and shift unlocking valve are closely connected and work together. The main hydraulic pressure from the oil pump enters the main hydraulic pressure regulating valve. The main hydraulic pressure pushes the steel ball and spring through the valve core. The main hydraulic pressure is discharged through the drain port. Under the action of the hydraulic cylinder pressure oil, the spring and valve core reset. The pressure oil goes to the torque converter and lubrication circuit. The lock-up valve receives the main pressure from the main pressure regulating valve and the Pitot tube pressure. The oil pressure from the Pitot tube acts on the locking valve core, compressing the spring. Part of the oil is discharged through the drain port, and part of the main pressure oil in the lock-up valve flows to the shift unlocking valve, pushing the flow valve core. After the shift unlocking valve is opened, part of the main hydraulic pressure from the oil pump and flow valve flows through a slot into the pressure regulating valve plug cavity of the main hydraulic pressure regulating valve, pushing the pressure regulating valve plug. The pressure oil goes through the check valve and damping orifice to the drain port to discharge, reducing the main hydraulic pressure, thus realizing two-stage pressure regulation of the main hydraulic pressure. To ensure stable main oil pressure in the hydraulic system, smooth operation of each signal valve, prevention of hydraulic system overload, and improvement of shifting quality and service life of transmission system components.

[0041] Therefore, the present invention:

[0042] 1. Under the action of the boost signal, the pressure oil passes through the cavity gap and pushes the valve plug to the left. The pressure oil enters the drain port through the groove and cone of the regulating valve plug. The improved groove of the regulating valve plug increases the main oil pressure drain and reduces the main oil pressure, so that the hydraulic transmission for railcars is stable and reliable in actual shifting operation.

[0043] 2. The two-stage pressure regulation control structure of the hydraulic transmission increases the oil pressure contact area of ​​the main oil pressure regulating valve and adds another main oil pressure passage connected to the lock-up valve, flow valve and main oil pressure regulating valve, ensuring shift quality and the stability of the hydraulic system.

[0044] 3. Add another pressure regulating stage to the main oil pressure regulating valve's first-stage pressure regulating structure to ensure that the main oil pressure in the hydraulic system drops and stabilizes after dropping, effectively ensuring smooth main oil pressure return during gear shifting and reducing shifting impact dynamic load.

[0045] 4. The pressure regulating valve plug material has been changed from high-quality carbon structural steel to high-quality alloy structural steel, and a carbonitriding process has been adopted, which has good wear resistance and fatigue resistance, and is suitable for high ambient temperature.

Claims

1. A two-stage hydraulic pressure regulation control structure for a rail transmission, comprising a main hydraulic pressure regulating valve body (2), characterized in that: The main oil pressure regulating valve body (2) is fitted with a regulating valve core assembly (1), and the regulating valve core assembly (1) has a pressure regulating valve plug (7) at its end. On the main oil pressure regulating valve body (2), an oil inlet is opened near the end of the regulating valve core assembly (1), and an oil drain is opened near the oil inlet. The regulating valve core assembly (1) can be moved to open and close the oil inlet and the oil drain. The two oil inlets form two oil chambers in the main oil pressure regulating valve body (2). There are two oil inlets and two oil drains, namely a first oil inlet and a second oil inlet, and a first oil drain and a second oil drain. A torque converter oil outlet is also opened between the two oil inlets, and the oil outlet is connected to at least one oil chamber corresponding to the oil inlet. The main oil pressure regulating valve body (2) is connected to the lock-up valve and the shift unlock valve, and the pitot tube is connected to the lock-up valve. The main oil pressure from the oil pump enters the main oil pressure regulating valve through the first inlet. When the main oil pressure reaches the set pressure, it pushes the steel ball in the center hole of the valve core, which flows into the oil chamber at the left end of the valve core through the damping orifice. The force of the pressurized oil acting on the annular area of ​​the regulating valve core assembly pushes the valve core and spring to move to the right, connecting the first inlet chamber and the first outlet chamber. The pressurized oil then flows through the first outlet chamber to the torque converter and lubrication circuit. The movement of the valve core causes the oil pressure to flow out from the outlet, and the pressure from the Pitot tube enters the lock-up valve. Oil pressure pushes the locking valve core to move, causing the main oil pressure oil from the main oil pressure regulating valve to the lock-up valve to enter the shift unlocking valve. Under the action of the boost signal, the main oil pressure enters the valve plug position of the main oil pressure regulating valve body, pushing the pressure regulating valve plug to move to the left. The pressure regulating valve plug is provided with a groove. When the second oil inlet chamber is connected to the first oil outlet chamber, the main oil pressure discharge in the oil circuit increases, the main oil pressure decreases, and the thrust generated by the oil pressure overcomes the spring force, pushing the pressure regulating valve plug to move to the right and return to its original position, thus realizing two-stage pressure regulation control of the hydraulic transmission oil pressure.

2. The two-stage hydraulic pressure regulation control structure for a rail transmission as described in claim 1, characterized in that: The regulating valve core assembly (1) is fitted with a stop sleeve (3) and a spring (5). The stop sleeve (3) is fixed relative to the regulating valve core assembly (1), and the end of the spring (5) is fixed to the stop sleeve (3) and the main oil pressure regulating valve body (2).

3. The two-stage hydraulic pressure regulation control structure for a rail transmission as described in claim 1, characterized in that: One of the drain ports is located outside the end of the regulating valve core assembly (1), and the other is located in the middle of the regulating valve core assembly (1).

4. The two-stage hydraulic pressure regulation control structure for a rail transmission as described in claim 1, characterized in that: The oil inlet and oil outlet face the same direction and are both perpendicular to the side wall of the main oil pressure regulating valve body (2).

5. The two-stage hydraulic pressure regulation control structure for a rail transmission as described in claim 1, characterized in that: A set screw (4) is also provided on the side of the main oil pressure regulating valve body (2) for limiting and locking the regulating valve core assembly (1).

6. The two-stage hydraulic pressure regulation control structure for a rail transmission as described in claim 1, characterized in that: The main oil pressure regulating valve body (2) has an opening at one end of the regulating valve core assembly (1) so that the regulating valve core assembly (1) can be removed. A pressure regulating valve plug (9) is installed at the end of the regulating valve core assembly (1) at the opening.

7. The two-stage hydraulic pressure regulation control structure for a rail transmission as described in claim 1, characterized in that: The pressure regulating valve plug (7) is made of alloy structural steel.

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