Integrated electro-hydraulic control valve of retarder in hydraulic transmission box

Abstract

The utility model relates to a control valve of a retarder, in particular to an integrated electro-hydraulic control valve of an internal retarder of a hydraulic transmission box, and aims to overcome the defects that an oil control valve of the retarder in the prior art is poor in stability or complex in structure and easy to damage. The integrated electro-hydraulic control valve comprises a first shell, a second shell, a retarder valve element and a pressure reducing valve, wherein the first shell and the second shell are coaxially connected, the retarder valve element is arranged in the first shell, and the pressure reducing valve is arranged in the second shell. The second shell is provided with an oil duct I and an oil duct L corresponding to the exterior of the pressure reducing valve, the oil duct I communicates with a transmission main oil pressure oil duct through a first through hole of the first shell, and the oil duct L communicates with the end face of the end, close to the second shell, of the retarder valve element; an oil duct K in the pressure reducing valve is communicated with the oil duct I and an oil duct H in the second shell; after the pressure reducing valve moves, the oil duct I is communicated with the oil duct L; and the oil duct H is communicated with an oil duct at the other end of the retarder valve core through an oil duct J in the second shell.

Description

Technical Field

[0001] This utility model relates to a control valve for a retarder, specifically an integrated electro-hydraulic control valve for a retarder inside a hydraulic transmission. Background Technology

[0002] Mining trucks, due to complex road conditions and heavy loads, require frequent braking to maintain a safe speed. Currently, commonly used auxiliary braking devices include engine braking, exhaust braking, eddy current retarders, hydraulic retarders, self-excited retarders, and permanent magnet retarders. Among these, hydraulic retarders are a type of flexible braking, generating braking torque through the stator, rotor, and hydraulic transmission fluid. They exhibit no mechanical wear, extending the lifespan of the vehicle's braking system. Hydraulic retarders in hydraulic automatic transmissions typically use valve plate assemblies for electro-hydraulic control, but their complex structure makes manufacturing, assembly, and maintenance difficult. Existing mining hydraulic automatic transmissions use front-mounted retarders...

[0003] Chinese Patent CN 103195766A discloses a valve assembly and method for controlling a hydraulic retarder, as well as a hydraulic automatic transmission including the valve assembly. The valve assembly utilizes the seven choke edges of the valve core and the cylinder, in conjunction with the housing, to control the oil pressure generated by the control oil circuit and the action of the first and second springs set in the valve core. By relying on the movement of the valve core, the seven oil circuits form a specific interconnection mode, thereby realizing the control of the working state of the hydraulic retarder. However, the retarder oil directly enters the valve assembly, resulting in large pressure fluctuations and poor valve assembly stability.

[0004] Chinese patent CN 116146683A discloses a hydraulic transmission system support device and its working method for a hydraulic automatic transmission. The device includes valves such as a pressure regulating valve, a main pressure regulating valve, and an overflow safety valve for pressure regulation. The pressure regulation structure is complex and easily damaged, thereby reducing the performance of the retarder. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as poor stability of retarder hydraulic control valves or their complex and easily damaged structures, by providing an integrated electro-hydraulic control valve for the internal retarder of a hydraulic transmission.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] An integrated electro-hydraulic control valve for a retarder inside a hydraulic transmission includes a first housing and a retarder valve core. The first housing has a valve core hole along its central axis. The inner wall of the valve core hole has seven annular oil passages circumferentially arranged from one end to the other, each connecting to a transmission oil passage. The retarder valve core is disposed within the valve core hole. The valve core is characterized by further including a second housing, a pressure reducing valve, and a control assembly. The side wall of the first housing also has a first through hole at one end for connecting to the main hydraulic oil passage of the transmission. The second housing is coaxially connected to one end of the first housing and has an internal mounting cavity and oil passages H and J. The inner wall of the mounting cavity has oil passages I and L. Oil passage I connects to the other end of the first through hole, and oil passage L connects to the retarder valve core near the second housing. One end face; the pressure reducing valve is disposed in the mounting cavity, and the pressure reducing valve includes a pressure reducing valve body and an elastic component arranged coaxially. The side wall of the pressure reducing valve body matches the side wall of the mounting cavity and is slidably connected to it. The side wall of the pressure reducing valve body is provided with an annular groove corresponding to the oil passage L. An oil passage K is provided in the pressure reducing valve body. One end of the oil passage K is provided with an oil port h for connecting the oil passage I and the other end for connecting the oil passage H. The elastic component is disposed at the end of the pressure reducing valve body near the oil passage I, for connecting the oil passage I and the oil passage L through the annular groove after compression. The oil passage J connects to the oil passage H and connects to one of the seven annular oil passages located at the other end of the retarder valve core through a channel provided on the first housing. The control component is used to control the opening and closing of the oil passages H and J.

[0008] Furthermore, a mounting hole is provided on the side wall of the second housing corresponding to the other end of the pressure reducing valve body, and a plug is provided in the mounting hole;

[0009] The other end of the pressure reducing valve body is installed through the side wall of the oil passage H, and the end face is flush with the inner side wall of the oil passage H.

[0010] The elastic component includes a pressure reducing valve spring, with its two ends abutting against one end of the pressure reducing valve body and one end of the mounting cavity, respectively.

[0011] The pressure reducing valve body has a fourth through hole on its side wall, and the two ends of the fourth through hole are respectively connected to the flow channel L and the mounting cavity corresponding to the position of the pressure reducing valve spring.

[0012] Furthermore, a throttle is also provided at the other end of the pressure reducing valve body corresponding to the oil passage K;

[0013] One end of the pressure reducing valve body is provided with a small diameter section, and one end of the pressure reducing valve spring is sleeved on the small diameter section of the pressure reducing valve body.

[0014] Furthermore, the seven annular oil passages of the first housing are sequentially named oil passage A, oil passage B, oil passage C, oil passage D, oil passage E, oil passage F and oil passage G from the other end of the corresponding retarder valve core. The outer wall of the first housing is sequentially provided with oil ports a, b, c, d, e, f and g corresponding to the seven annular flow channels.

[0015] The outer wall of the retarder valve core is provided with four annular grooves along the circumference. Starting from the other end away from the second housing, they are sequentially referred to as the first groove, the second groove, the third groove, and the fourth groove. The first groove corresponds to oil passage A and oil passage B, the second groove corresponds to oil passage C and oil passage D, the third groove corresponds to oil passage E, and the fourth groove corresponds to oil passage F and oil passage G.

[0016] The retarder valve core, located away from the second housing, has a cavity along its central axis. Inside the cavity are a metal stop, a large retarder spring, a guide post, and a small retarder spring. One end of the small retarder spring abuts against one side wall of the cavity, and the other end is fitted onto one end of the guide post. The guide post is slidably connected to the side wall of the cavity. One end of the large retarder spring abuts against the other end of the guide post. The metal stop is located at the other end of the cavity and is slidably connected to the retarder valve core. One end of the metal stop is connected to the other end of the large retarder spring, and the other end abuts against the other end of the first housing.

[0017] The second housing is connected to the first housing by bolts.

[0018] Furthermore, a sealing end cap is provided at the other end of the first housing corresponding to the valve core hole. The sealing end cap is sealed to the first housing by bolts, and the other end of the metal block abuts against the sealing end cap.

[0019] Furthermore, the control component is a solenoid valve, with its inlet and outlet connected to oil passage H and oil passage J, respectively.

[0020] Furthermore, the first housing includes a main housing and a sealing cover plate. The side wall of the main housing is provided with an open end along the central axis direction, and the sealing cover plate is provided with a corresponding open end and is sealed to the main housing for installation with the bottom of the transmission housing.

[0021] The oil ports a, b, c, d, e, f, g, and the first through hole are disposed on the sealing cover plate; oil port a is used to connect with the oil pan of the transmission, oil port b is used to connect with the outlet of the transmission retarder, oil port c is used to connect with the inlet of the oil cooler used for cooling, oil port d is used to connect with the outlet of the torque converter to supply oil to the retarder, oil port e is used to connect with the inlet of the retarder, and oil port f is used to connect with the outlet of the oil cooler used for cooling.

[0022] Furthermore, the sealing cover plate has a circumferentially formed mounting groove on the outer side wall away from the first housing, and a special-shaped O-ring is provided in the mounting groove. A small hole is formed on the side wall of the mounting groove near the oil port a, and the small hole communicates with the oil port a.

[0023] Furthermore, pressure measuring holes are respectively provided on the side walls of the first housing corresponding to oil passages B, D, E and G, for connecting a pressure measuring device to measure the pressure of the corresponding oil passage.

[0024] Furthermore, the sidewall of the retarder valve core is provided with a second through hole and a third through hole. The second through hole is located between the first groove and the second groove, and its two ends are respectively connected to the retarder valve core cavity and the oil passage B.

[0025] The third through hole is located at the bottom of the third groove, and its two ends are respectively connected to the retarder valve core cavity and the oil passage E;

[0026] The first and second grooves are respectively connected to the outer sidewall of the retarder valve core with a first arc-shaped groove, and a second arc-shaped groove is formed on the third groove along the axial direction of the retarder valve core. These are used to reduce the impact of fluid on the retarder valve core and improve the performance of the retarder.

[0027] The beneficial effects of this utility model are:

[0028] 1. The present invention relates to an integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission, which includes a pressure reducing valve and a control component. Through the cooperation of the pressure reducing valve and the control component, the valve core of the retarder is driven to move, thereby regulating the flow of oil, minimizing oil pressure fluctuations, and improving the stability of the retarder.

[0029] 2. The present invention relates to an integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission, which is installed on the outside of the transmission housing. It features high integration, high performance, small size, and convenient assembly, and is conducive to quick disassembly, installation, and maintenance.

[0030] 3. In the integrated electro-hydraulic control valve of the internal retarder of the hydraulic transmission of this utility model, a throttle is provided at the other end of the oil passage K. The small orifice of the throttle increases the flow rate of the oil by limiting the area through which the oil passes, thereby reducing the oil pressure to a certain extent and reducing oil pressure fluctuations.

[0031] 4. The circular arc groove design of the valve core of the integrated electro-hydraulic control valve of the internal retarder of the hydraulic gearbox reduces the impact and fluctuation of the fluid on the retarder valve core, making the control smoother and improving the performance of the retarder. Attached Figure Description

[0032] Figure 1 This is a cross-sectional view of an embodiment of the integrated electro-hydraulic control valve of the internal retarder of the hydraulic gearbox of this utility model;

[0033] Figure 2 This is a partial cross-sectional view of an embodiment of the integrated electro-hydraulic control valve of the internal retarder of the hydraulic gearbox of this utility model;

[0034] Figure 3 This is a schematic diagram of the retarder valve core structure of an embodiment of the integrated electro-hydraulic control valve for the internal retarder of a hydraulic transmission of this utility model;

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Metal stop, 2-Retarder valve core, 3-Retarder large spring, 4-Retarder small spring, 5-First housing, 6-Guide post, 7-Plug, 8-Second housing, 9-Solenoid valve, 10-Pressure reducing valve spring, 11-Pressure reducing valve, 12-First through hole, 13-Sealing end cap, 14-Throttle, 15-Second through hole, 16-Third through hole, 17-Sealing cover plate, 18-First arc groove, 19-Second arc groove, 20-First groove, 21-Second groove, 22-Third groove, 23-Fourth groove, 24-Fourth through hole. Detailed Implementation

[0037] An integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission, such as Figure 1 and Figure 2 As shown, it includes a first housing 5 and a retarder valve core 2, as well as a second housing 8, a pressure reducing valve and a control assembly. One end of the first housing 5 is coaxially connected to the second housing 8 by bolts.

[0038] The first housing 5 includes a main housing and a sealing cover 17. The main housing has a valve core hole along its central axis. Seven annular oil passages are arranged circumferentially from one end to the other on the inner sidewall of the valve core hole. The retarder valve core 2 is disposed in the valve core hole. Axial movement of the retarder valve core 2 connects some adjacent oil passages. An open end is provided on the sidewall of the main housing along its central axis. The sealing cover 17 is sealed to the main housing at the corresponding open end for installation with the bottom of the transmission housing. Oil ports are provided on the sealing cover 17 corresponding to each annular oil passage, connecting to the transmission oil passages to achieve an electro-hydraulic controlled retarder. The sealing cover 17 also has a first through hole 12, one end of which connects to the transmission main hydraulic oil passage, thus achieving an electro-hydraulic controlled retarder.

[0039] One end of the retarder valve core 2 is positioned corresponding to the second housing 8, and the other end has a cavity along the central axis. A metal stop 1, a large retarder spring 3, a guide post 6, and a small retarder spring 4 are installed within the cavity. During assembly, the small retarder spring 4 is first inserted into the cavity near the end of the second housing 8, so that one end of the small retarder spring 4 abuts against the side wall of one end of the cavity. Then, the small end of the guide post 6 is nested into the other end of the small retarder spring 4. The guide post 6 supports the small retarder spring 4, and the large end of the guide post 6 is the working surface of the large retarder spring 3. The large retarder spring 3 is then inserted into the cavity, with one end abutting against the large end of the guide post 6. Finally, one end of the metal stop 1 is connected to the other end of the large retarder spring 3 and then inserted into the cavity. The metal stop 1 and the retarder valve core 2 are slidably connected. In this embodiment, one end of the metal stop 1 has a small diameter section, which is nested into the other end of the large retarder spring 3 for connection. The other end of the first housing 5 is provided with a sealing end cap 13 corresponding to the valve core hole. The sealing end cap 13 is sealed to the first housing 5 by bolts. The other end of the metal block 1 abuts against the sealing end cap 13. The two work together to compress the spring in the retarder valve core 2.

[0040] The seven annular oil passages of the first housing 5, starting from the end furthest from the second housing 8, are sequentially labeled as oil passage A, oil passage B, oil passage C, oil passage D, oil passage E, oil passage F, and oil passage G. The oil ports of the sealing cover 17 are correspondingly labeled as port a, port b, port c, port d, port e, port f, and port g. Port a connects to the transmission oil pan; port b connects to the retarder outlet; port c connects to the inlet of the oil cooler used for cooling; port d connects to the torque converter outlet to supply oil to the retarder; port e connects to the retarder inlet; and port f connects to the outlet of the oil cooler used for cooling. The sealing cover 17 is fitted to the bottom of the transmission housing and connects to the transmission oil passages through end face oil holes to achieve electro-hydraulic control of the retarder. The sealing cover 17 has a circumferentially circumferentially opened mounting groove on the outer side wall away from the first housing 5. A special-shaped O-ring is set in the mounting groove. A small hole is opened on the side wall of the mounting groove near the oil port a. The small hole communicates with the oil port a, which has a better sealing effect and prevents the accumulation of oil in the mounting groove from forming oil pressure and causing the seal to fail.

[0041] Four annular grooves are provided circumferentially on the outer wall of the retarder valve core 2, which are sequentially labeled as first groove 20, second groove 21, third groove 22, and fourth groove 23 from the end away from the second housing 8. First groove 20 corresponds to oil passages A and B, second groove 21 corresponds to oil passages C and D, third groove 22 corresponds to oil passage E, and fourth groove 23 corresponds to oil passages F and G. During retarder operation, the oil flow rate is large, and the oil pressure fluctuates greatly. The movement of the retarder valve core 2 causes rapid changes in oil movement and a large flow rate at the moment the oil passages close and open. When this occurs on the retarder valve core 2, it may cause unstable valve core movement, resulting in left-right and up-down movements. To reduce such oil impact, first arc-shaped grooves 18 are formed at the connection points between the sidewalls of the first groove 20 and the sidewalls of the second groove 21 and the outer wall of the retarder valve core 2, respectively. Second arc-shaped grooves 19 are formed along the axial direction of the retarder valve core 2 on the sidewall and bottom of the third groove 22. Figure 3 As shown, the flow rate changes during opening and closing are mitigated, making the retarder valve core 2 run smoothly and improving the retarder performance.

[0042] The retarder valve core 2 has a second through hole and a third through hole on its side wall. The second through hole is located between the first groove 20 and the second groove 21, and its two ends are connected to the cavity of the retarder valve core 2 and the oil passage B, respectively. The third through hole is located at the bottom of the third groove 22, and its two ends are connected to the cavity of the retarder valve core 2 and the oil passage E, respectively. The first housing 5 has pressure measuring holes on its side walls corresponding to the oil passages B, D, E and G, for connecting a pressure measuring device to measure the pressure of the corresponding oil passages.

[0043] The second housing 8 has an internal mounting cavity and oil passages H and J. The second housing is used to integrate an electro-hydraulic pressure reducing valve and control components, assembling the pressure reducing valve and control components into a single unit, reducing the space occupied while ensuring functionality. The inner wall of the mounting cavity has oil passages I and L. Oil passage I connects to the other end of the first through hole 12, and oil passage L connects to the end face of the retarder valve core 2 near the second housing 8.

[0044] A pressure-reducing valve is installed within the mounting cavity. The valve includes a valve body 11 and a spring 10 coaxially arranged. The sidewall of the valve body 11 matches and slides with the sidewall of the mounting cavity. An annular groove is provided on the sidewall of the valve body 11 corresponding to the oil passage L. An oil passage K is provided within the valve body 11, with an oil port h at one end for connecting to oil passage I. A small-diameter section is provided at the end of the valve body 11 near oil passage I. One end of the spring 10 is fitted onto this small-diameter section, and the other end abuts against one end of the valve body 11 and one end of the mounting cavity. When the valve body 11 is subjected to oil pressure, it moves towards the end near the spring 10, compressing the spring 10. Oil passages I and L are then connected through the annular groove. The other end of the valve body 11 passes through the sidewall of oil passage H, with its end face flush with the inner sidewall of oil passage H. The other end of oil passage K passes through the other end of the valve body 11 and connects to one end of oil passage H. A throttle 14 is also provided at the other end of the pressure reducing valve body 11 corresponding to the oil passage K. The small orifice of the throttle 14 increases the flow velocity of the oil by limiting the area through which the oil passes, thereby reducing the oil pressure and reducing oil pressure fluctuations. To achieve a stable pressure reduction effect, a fourth through hole 24 is opened on the side wall of the pressure reducing valve body 11. The two ends of the fourth through hole 24 are respectively connected to the flow passage L and the mounting cavity corresponding to the position of the pressure reducing valve spring 10.

[0045] One end of oil passage J is connected to the other end of oil passage H, and the other end is connected to oil passage A through a channel provided on the first housing 5. The side wall of the second housing 8 is provided with a mounting hole corresponding to the other end of the pressure reducing valve body 11 to facilitate the installation of the pressure reducing valve. A plug 7 is provided in the mounting hole to seal the mounting hole.

[0046] The control component is used to control the opening and closing of oil passages H and J. In this embodiment, the control component uses a solenoid valve 9, whose inlet and outlet are connected to the other end of oil passage H and one end of oil passage J, respectively.

[0047] The working principle of this utility model is as follows: The main hydraulic oil in the transmission enters oil passage I through the first through-hole 12, then enters oil passage K of the pressure reducing valve body 11 through oil port h, and then enters oil passage H through the throttle 14. The oil flows from the other end of oil passage H through the solenoid valve 9 to one end of oil passage J, and then from the other end of oil passage J through the inner hole in the first housing 5 into oil passage A. It connects to the oil pan through oil port a, directly releasing the pressure. When the driver activates the retarder, the solenoid valve 9 is energized and closed, disconnecting oil passage H from oil passage J. Oil passage H becomes a dead chamber, generating oil pressure. This oil pressure acts on the other end face of the pressure reducing valve. When the oil pressure exceeds the spring force of the pressure reducing valve spring, it pushes the pressure reducing valve to move, connecting oil passage I with oil passage L. The main hydraulic oil circuit acts on one end face of the retarder valve core 2 through the oil passage L. When the oil pressure is greater than the spring force generated by the large retarder spring 3 and the small retarder spring 4, the retarder valve core 2 moves towards the other end closer to the first housing 5.

[0048] After the retarder valve core 2 moves towards the other end closer to the first housing 5, oil port c connects with oil port b, meaning the retarder outlet connects with the oil cooler inlet. The retarder valve core 2 then blocks oil port d (torque converter outlet), gradually reducing the oil passage area. As the retarder valve core 2 continues to move, oil port d closes with oil port c, while oil port d and oil port e open and connect. The oil from the torque converter outlet flows directly into the retarder, causing the oil in the retarder to begin working and generating braking torque. The heat generated by the retarder braking raises the oil temperature, and the oil from the retarder outlet flows into the oil cooler for cooling. At this time, oil port f connects with oil port e, meaning the oil cooler outlet connects with the retarder inlet, and the cooled oil flows back into the retarder to continue working.

[0049] The retarder valve core 2 is provided with a third through hole 33 corresponding to the retarder outlet and a second through hole 34 corresponding to the retarder inlet, so that the retarder inlet and outlet are connected, ensuring that the oil pressure of the inlet and outlet of the retarder is basically the same. When the oil pressure of the outlet is too high, the retarder valve core 2 moves to the right, the flow area of ​​oil port d and oil port e is reduced, and less oil flows into the retarder. When the oil pressure of the retarder inlet is too high, the retarder valve core 2 also moves to the right, which will also reduce the amount of oil entering the retarder, ensuring the stable and safe operation of the retarder and adjusting the retarder oil pressure to maintain a stable value.

[0050] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. An integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission, comprising a first housing (5) and a retarder valve core (2), wherein the first housing (5) has a valve core hole along its central axis, and the inner sidewall of the valve core hole is provided with seven annular oil passages connecting to the transmission oil passages in a circumferential direction from one end to the other, and the retarder valve core (2) is disposed in the valve core hole; characterized in that: It also includes a second housing (8), a pressure reducing valve, and control components; The side wall of the first housing (5) is also provided with a first through hole (12) at one end for connecting to the main oil pressure passage of the transmission; The second housing (8) is coaxially connected to one end of the first housing (5), and an installation cavity and oil passages H and J are provided inside it; oil passages I and L are provided on the inner side wall of the installation cavity, oil passage I is connected to the other end of the first through hole (12), and oil passage L is connected to the end face of the retarder valve core (2) near the second housing (8); The pressure reducing valve is installed in the mounting cavity. The pressure reducing valve includes a pressure reducing valve body (11) and an elastic component arranged coaxially. The side wall of the pressure reducing valve body (11) matches the side wall of the mounting cavity and is slidably connected to it. The side wall of the pressure reducing valve body (11) is provided with an annular groove corresponding to the oil passage L. An oil passage K is provided in the pressure reducing valve body (11). One end of the oil passage K is provided with an oil port h for connecting the oil passage I and the other end for connecting the oil passage H. The elastic component is provided at the end of the pressure reducing valve body (11) near the oil passage I, for connecting the oil passage I and the oil passage L through the annular groove after compression. The oil passage J is connected to the oil passage H, and is connected to one of the seven annular oil passages located at the other end of the retarder valve core (2) through a channel provided on the first housing (5); The control component is used to control the opening and closing of oil passages H and J.

2. The integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to claim 1, characterized in that: The side wall of the second housing (8) is provided with a mounting hole at the other end of the pressure reducing valve body (11), and a plug (7) is provided in the mounting hole; The other end of the pressure reducing valve body (11) is provided through the side wall of the oil passage H, and the end face is flush with the inner side wall of the oil passage H. The elastic component includes a pressure reducing valve spring (10), the two ends of which abut against one end of the pressure reducing valve body (11) and one end of the mounting cavity, respectively. The pressure reducing valve body (11) has a fourth through hole (24) on its side wall. The two ends of the fourth through hole (24) are connected to the flow channel L and the mounting cavity corresponding to the position of the pressure reducing valve spring (10), respectively.

3. The integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to claim 2, characterized in that: The pressure reducing valve body (11) is also provided with a throttle (14) at the other end of the oil passage K; One end of the pressure reducing valve body (11) is provided with a small diameter section, and one end of the pressure reducing valve spring (10) is sleeved on the small diameter section of the pressure reducing valve body (11).

4. An integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to any one of claims 1-3, characterized in that: The seven annular oil passages of the first housing (5) are sequentially named oil passage A, oil passage B, oil passage C, oil passage D, oil passage E, oil passage F and oil passage G from the other end of the corresponding retarder valve core (2). The outer side wall of the first housing (5) is sequentially provided with oil port a, oil port b, oil port c, oil port d, oil port e, oil port f and oil port g corresponding to the seven annular flow channels. The outer wall of the retarder valve core (2) is provided with four annular grooves along the circumference. Starting from the other end away from the second housing (8), they are sequentially called the first groove (20), the second groove (21), the third groove (22), and the fourth groove (23). The first groove (20) is provided for oil passages A and B, the second groove (21) is provided for oil passages C and D, the third groove (22) is provided for oil passage E, and the fourth groove (23) is provided for oil passages F and G. The retarder valve core (2) is located away from the second housing (8) and has a cavity along its central axis. The cavity contains a metal block (1), a large retarder spring (3), a guide post (6), and a small retarder spring (4). One end of the small retarder spring (4) abuts against the side wall of one end of the cavity, and the other end is sleeved on one end of the guide post (6). The guide post (6) is slidably connected to the side wall of the cavity. One end of the large retarder spring (3) abuts against the other end of the guide post (6). The metal block (1) is located at the other end of the cavity and is slidably connected to the retarder valve core (2). One end of the metal block (1) is connected to the other end of the large retarder spring (3), and the other end abuts against the other end of the first housing (5). The second housing (8) is connected to the first housing (5) by bolts.

5. The integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to claim 4, characterized in that: The other end of the first housing (5) is provided with a sealing end cap (13) corresponding to the valve core hole. The sealing end cap (13) is sealed to the first housing (5) by bolts. The other end of the metal block (1) abuts against the sealing end cap (13).

6. The integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to claim 5, characterized in that: The control component is a solenoid valve (9), and the inlet and outlet of the solenoid valve (9) are connected to oil passage H and oil passage J, respectively.

7. The integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to claim 6, characterized in that: The first housing (5) includes a main housing and a sealing cover plate (17). The side wall of the main housing is provided with an opening end along the central axis direction. The sealing cover plate (17) is provided with the opening end and is sealed to the main housing for installation with the bottom of the transmission housing. The oil ports a, b, c, d, e, f, g and the first through hole (12) are provided on the sealing cover plate (17); oil port a is used to connect with the oil pan of the transmission, oil port b is used to connect with the outlet of the transmission retarder, oil port c is used to connect with the inlet of the oil cooler used for cooling, oil port d is used to connect with the outlet of the torque converter to supply oil to the retarder, oil port e is used to connect with the inlet of the retarder, and oil port f is used to connect with the outlet of the oil cooler used for cooling.

8. The integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to claim 7, characterized in that: The sealing cover (17) has a circumferentially circumferentially opened mounting groove on the outer side wall away from the first housing (5). A special-shaped O-ring is set in the mounting groove. A small hole is opened on the side wall of the mounting groove near the oil port a, and the small hole communicates with the oil port a.

9. The integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to claim 8, characterized in that: The first housing (5) is provided with pressure measuring holes on the side walls corresponding to oil passages B, D, E and G, respectively, for connecting pressure measuring devices to measure the pressure of the corresponding oil passages.

10. The integrated electro-hydraulic control valve for an internal retarder of a hydraulic transmission according to claim 9, characterized in that: The sidewall of the retarder valve core (2) is provided with a second through hole (34) and a third through hole (33). The second through hole is located between the first groove (20) and the second groove (21), and its two ends are respectively connected to the cavity of the retarder valve core (2) and the oil passage B. The third through hole is located at the bottom of the third groove (22), and its two ends are respectively connected to the cavity of the retarder valve core (2) and the oil passage E; The first arc-shaped groove (18) is opened at the connection between the side wall of the first groove (20) and the side wall of the second groove (21) and the outer side wall of the retarder valve core (2), respectively. The third groove (22) is opened along the axial direction of the retarder valve core (2) to reduce the impact of the fluid on the retarder valve core (2) and improve the performance of the retarder.

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