Hydraulic control system for full-power gear shifting gearbox

Abstract

The utility model provides a hydraulic control system for a full-power gear shifting gearbox. Comprising a gearbox shell and a hydraulic main oil way, and a hydraulic medium of the hydraulic main oil way sequentially passes through an oil outlet of the gearbox shell, a first oil pump and a hydraulic control subsystem and returns into the gearbox shell; the hydraulic control subsystem comprises a first control circuit, a second control circuit and a third control circuit. According to the hydraulic system designed for the full-power gear shifting gearbox, the first control valve is controlled through the first control circuit, and liquid is filled for the corresponding wet clutch after the first control valve is switched on, so that power is transmitted; and after a second control valve and a third control valve of the second control circuit and the third control circuit are switched on, gears are switched for corresponding synchronizer electric control push rods. The corresponding first control valve, the second control valve and the third control valve are powered on by controlling logic program instructions, and the wet clutch and the synchronizer are controlled and driven according to logic, so that the power gear shifting function of the gearbox is achieved.

Description

Technical Field

[0001] The utility model relates to the field of gearbox transmission, in particular to a hydraulic control system for a full-power shift gearbox. Background Art

[0002] A full powershift transmission includes components such as gears, bearings, wet clutches, and synchronizers. The TCU (Transmission Control Unit) controls the engagement and disengagement of clutches and synchronizers to achieve different power transmission paths, enabling power shifting and reversing, reducing operator workload and improving work efficiency. Existing hydraulic system designs for powershift transmissions typically achieve shifting by engaging and disengaging multiple clutches. Each clutch is assigned a corresponding cylinder, which engages and disengages the clutches under the action of hydraulic pressure. When a large number of cylinders need to be controlled, the design of the hydraulic circuit directly affects the changes in hydraulic pressure within the cylinders and the simultaneous changes in hydraulic pressure between different cylinder groups, thereby affecting the effectiveness of clutch exchange and coordination, and thus directly determining the shift quality of the transmission.

[0003] Therefore, it is necessary to provide a hydraulic control system for a full power shift transmission to overcome the above-mentioned defects. Utility Model Content

[0004] The purpose of the utility model is to provide a hydraulic control system for a full power shift transmission.

[0005] According to one aspect of the present invention, a hydraulic control system for a full power shift transmission is provided, comprising:

[0006] an oil tank formed inside the transmission housing and capable of containing the hydraulic medium;

[0007] The hydraulic main oil circuit, whose hydraulic medium returns to the gearbox housing through the gearbox housing oil outlet, the first oil pump and the hydraulic control subsystem in sequence;

[0008] The hydraulic control subsystem includes:

[0009] The first control circuit includes a plurality of first control valves, each corresponding to a clutch, and connected in parallel to the main hydraulic oil circuit; the first control valves control the hydraulic medium to drive the actuator of the corresponding clutch;

[0010] a second control circuit including a plurality of second control valves, one corresponding to each master synchronizer and connected in parallel to the main hydraulic oil circuit; the second control valves controlling the hydraulic medium to drive the actuator of the corresponding master synchronizer; the master synchronizer being a synchronizer that cooperates with the clutch to adjust the working mode;

[0011] The third control circuit includes multiple third control valves, which correspond one to one with the auxiliary synchronizers and are connected in parallel to the hydraulic main oil circuit; the second control valve controls the hydraulic medium to drive the actuator of the corresponding auxiliary synchronizer; the auxiliary synchronizer is a synchronizer used to adjust the gear position.

[0012] Preferably, it also includes:

[0013] The accumulator is arranged in parallel on the main hydraulic oil circuit.

[0014] Preferably, it also includes:

[0015] An oil suction filter element is provided at the oil outlet of the gearbox housing or on the connecting pipeline from the oil outlet to the oil pump;

[0016] The oil pressure filter is installed on the outside of the transmission case and is arranged on the oil outlet side of the first oil pump.

[0017] Preferably, it also includes:

[0018] a lubricating oil circuit, wherein the hydraulic medium passes through the oil outlet of the transmission housing, the second oil pump and the lubricating oil subsystem in sequence;

[0019] The lubricating oil subsystem includes:

[0020] a first lubricating oil circuit connected to the lubricating oil circuit of the first oil pump and / or the second oil pump;

[0021] The second lubricating oil circuit is connected to the lubricating oil circuit of the transmission system and / or the clutch in the transmission housing.

[0022] Preferably, it also includes:

[0023] The second lubricating oil circuit includes an annular oil channel arranged on the end cover of the transmission housing. A plurality of lubricating branches are arranged on the annular oil channel, which are respectively connected to the lubricating oil circuits of the transmission shaft and / or bearings and / or wet clutch in the transmission housing.

[0024] Preferably, the lubricating oil subsystem, the valve group of the first control circuit and the second control circuit are integrated to form a first valve group;

[0025] The valve groups of the third control circuit are integrated to form at least one second valve group.

[0026] Preferably, the first valve group includes:

[0027] A first valve body; defining the connection surface between the first valve body and the transmission housing as a first mounting surface, and the other surfaces as first non-mounting surfaces;

[0028] a first oil inlet, provided on the first non-mounting surface and connected to the second oil pump via a pipeline;

[0029] a second oil inlet, provided on the first non-mounting surface and connected to the first oil pump via a pipeline;

[0030] a first interface, provided on the first mounting surface and connected to the first oil inlet via an oil passage provided inside the first valve body;

[0031] at least two second interfaces, provided on the first mounting surface and connected to the second oil inlet via a plurality of parallel oil passages provided inside the first valve body;

[0032] At least two first control valves and / or at least two second control valves are integrated on the first valve body and connected in series to the parallel oil circuit where the second interface is located;

[0033] The third interface is provided on the first mounting surface, is connected to the oil return port of the first control valve and / or the second control valve, and corresponds to the oil return port provided on the transmission case housing.

[0034] Preferably, the first control valve group further includes:

[0035] at least one fourth interface, provided on the first non-installation surface and connected to the second oil inlet via an oil passage provided inside the first valve body;

[0036] and / or

[0037] a relief valve, integrated with the first valve body, wherein the control end of the relief valve is connected to the oil return port, the high-pressure end is connected to the second interface, and the low-pressure end is connected to the first interface;

[0038] Preferably, the first valve group further includes:

[0039] The seventh interface is provided on the first non-installation surface and is connected to the first lubricating oil circuit.

[0040] Preferably, the second valve group includes:

[0041] The second valve body; the connection surface between the second valve body and the gearbox housing is defined as the second mounting surface, and the other surfaces are defined as the second non-mounting surfaces;

[0042] a third oil inlet, integrated on the second non-mounting surface and connected to the fourth interface via a pipeline;

[0043] at least two fifth interfaces, provided on the second mounting surface and connected to the second oil inlet via a plurality of parallel oil passages provided inside the second valve body;

[0044] at least two third control valves, integrated on the second valve body and connected in series to the parallel oil circuit where the second interface is located;

[0045] The sixth interface is provided on the second mounting surface, is connected to the oil return port of the second control valve, and corresponds to the oil return port.

[0046] Compared to the prior art, the hydraulic control system for a full-power shift transmission provided by the present invention has the following advantages: The hydraulic system designed for a full-power shift transmission controls a first control valve via a first control circuit. When connected, it fills the corresponding wet clutch and transmits power. The second and third control valves, respectively, via second and third control circuits, switch gears by electrically controlling the corresponding synchronizer push rods. Control logic program instructions energize the corresponding first, second, and third control valves, driving the wet clutches and synchronizers according to logic control to achieve the transmission's power shift function and ensure shift quality. Furthermore, by assembling system components such as the gear pump, oil suction filter, oil pressure filter, electro-hydraulic valve block, and piping within the transmission housing to form an independent system, the hydraulic control system not only simplifies the piping layout of the entire system but also facilitates assembly and operation of the full-power shift transmission. The transmission system operates normally as long as there is power input. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0048] Figure 1 This is a schematic diagram of the structure of the hydraulic control system in the utility model;

[0049] Figure 2 This is a schematic diagram of the principle of the hydraulic control system in this utility model;

[0050] Figure 3 This is a schematic structural diagram of the gearbox housing in the present invention;

[0051] Figure 4 This is a structural diagram of the non-installation surface of the first control valve group in the present invention;

[0052] Figure 5 This is a structural diagram of the mounting surface of the first control valve group in the present utility model;

[0053] Figure 6 This is a schematic diagram of the principle of the first control valve group in the present utility model;

[0054] Figure 7 This is a structural diagram of the non-installation surface of the second control valve group in the present invention;

[0055] Figure 8 This is a structural diagram of the mounting surface of the second control valve group in the present utility model;

[0056] Figure 9 This is a schematic diagram of the principle of the second control valve group in the present utility model.

[0057] Description of Figure Numbers:

[0058] 1. Gearbox housing; 11a. First end cover; 11b. Second end cover; 12. Oil outlet; 13. Hydraulic oil inlet; 14. Oil return port; 15. Lubricating oil inlet;

[0059] 2. Duplex gear pump; 21. Second oil pump; 22. First oil pump;

[0060] 3. First valve group; 31. First valve body; 31a. First mounting surface; 31b. First non-mounting surface; 32a. First oil inlet; 32b. Second oil inlet; 33a. First interface; 33b. Second interface; 33c. Third interface; 34a. First control valve; 34b. Second control valve; 35a. Fourth interface; 35b. Seventh interface; 35c. Eighth interface; 36. Relief valve; E1. First synchronizer valve; E2. Second synchronizer valve;

[0061] E3, third synchronizer valve; E4, fourth synchronizer valve; E5, fifth synchronizer valve; E6, sixth synchronizer valve; C1, first clutch valve; C2, second clutch valve; C3, third clutch valve; CR, fourth clutch valve; C4WD, fifth clutch valve;

[0062] 4. Second valve group; 41. Second valve body; 41a. Second mounting surface; 41b. Second non-mounting surface; 42. Third oil inlet; 43. Fifth port; 44. Third control valve; 45. Sixth port; E7. Seventh synchronizer valve; E8. Eighth synchronizer valve; E9. Ninth synchronizer valve; E10. Tenth synchronizer valve; E11. Eleventh synchronizer valve; E12. Twelfth synchronizer valve;

[0063] 5. Accumulator;

[0064] 6. Oil suction filter;

[0065] 7. Oil pressure filter. DETAILED DESCRIPTION

[0066] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only 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 work.

[0067] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0068] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0069] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0070] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0071] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0072] See also Figures 1 to 9 This embodiment provides a hydraulic control system for a full power shift transmission, including: a transmission housing 1, a hydraulic main oil circuit, a first oil pump 22, a hydraulic control subsystem, a second oil pump 21 and a lubricating oil subsystem.

[0073] A transmission device is provided inside the transmission housing 1. The transmission device includes: a power input shaft, a power output shaft, an intermediate shaft, an intermediate gear set, and a power output gear set arranged in parallel with each other. The power input shaft is connected to the engine to output engine power, and the power input shaft also serves as the PTO output shaft; the power output shaft finally outputs the power after the gear shift; the intermediate shaft is loosely mounted on the PTO output shaft; the intermediate gear set is provided on the intermediate shaft; the power output gear set is provided on the power output shaft and meshes with the intermediate gear set to output power. The transmission device also includes a synchronizer and a clutch. An oil circuit is provided inside the transmission housing 1, which is connected to the synchronizer and the clutch respectively. The synchronizer and the clutch are switched by cooperating with the control hydraulic system, thereby realizing the gear shifting operation. In this embodiment, the specific structure of the transmission device can be found in the company's prior application (publication number: CN112984055A), so it will not be further described here.

[0074] An oil tank is formed inside the transmission housing 1 and is capable of accommodating a hydraulic medium, preferably an oil having both hydraulic and lubricating functions. A first end cap 11a and a second end cap 11b are provided at both ends of the transmission housing 1, with the ends of the transmission housing 1 being defined as the direction perpendicular to the power input shaft and / or power output shaft and / or intermediate shaft. Multiple hydraulic oil inlets 13 and oil return ports 14 are provided on both sides of the first end cap 11a and the second end cap 11b of the transmission housing, respectively. The hydraulic oil inlets 13 are connected to the actuators of the clutch and synchronizer, respectively, to achieve control of the clutch and synchronizer. A lubricating oil inlet 15 is also provided on one side of the first end cap 11a of the transmission housing 1. The annular oil passage on the first end cap 11a has multiple lubrication branches provided on the annular oil passage, each connected to the lubricating oil passages of the drive shaft and / or bearings and / or wet clutch within the transmission housing 1.

[0075] The main hydraulic oil circuit is located outside the transmission housing 1. Its hydraulic medium flows through the transmission housing's oil outlet 12, the first oil pump 22, and the hydraulic control subsystem, returning to the transmission housing 1. The hydraulic control subsystem comprises a first control circuit, a second control circuit, and a third control circuit. The first control circuit includes multiple first control valves 34a, which correspond to the same number of clutches as the clutches. In this embodiment, the first control valves 34a include five clutch control valves: the first clutch valve C1, the second clutch valve C2, the third clutch valve C3, the fourth clutch valve CR, and the fifth clutch valve C4WD. These valves control the three forward wet clutches C1, C2, and C3, a reverse wet clutch CR, and a four-wheel drive wet clutch C4DW. The second control circuit includes multiple second control valves 34b, which correspond to the same number of master synchronizers as the master synchronizers, which work with the clutches to adjust the operating mode. In this embodiment, the second control valve 34b includes six synchronizer control valves: the first synchronizer valve E1, the second synchronizer valve E2, the third synchronizer valve E3, the fourth synchronizer valve E4, the fifth synchronizer valve E5, and the sixth synchronizer valve E6. These valves control six different main synchronizer actuators, namely the main synchronizer electronically controlled push rods. The third control circuit includes multiple third control valves 44. The third control valves 44 are the same number as the secondary synchronizers, and correspond one-to-one with the secondary synchronizers used to adjust the gear position. In this embodiment, the third control circuit includes six synchronizer valves: the seventh synchronizer valve E7, the eighth synchronizer valve E8, the ninth synchronizer valve E9, the tenth synchronizer valve E10, the eleventh synchronizer valve E11, and the twelfth synchronizer valve E12. These valves actuate the corresponding synchronizer electronically controlled push rods to engage the synchronizer gear position.

[0076] The hydraulic control subsystem is also provided with an accumulator 5, which is arranged in parallel with the hydraulic main oil circuit. That is, the accumulator 5 is arranged in parallel with the first control circuit, the second control circuit and the third control circuit. The accumulator 5 can ensure the smoothness of the separation and engagement of each wet clutch and the smoothness of the gear switching of each synchronizer.

[0077] In order to ensure the cleanliness of the oil in the hydraulic control system, an oil suction filter 6 and an oil pressure filter 7 are provided on the main hydraulic oil circuit. The oil suction filter 6 is provided on the oil outlet 12 of the transmission housing 1 or on the connecting pipeline from the oil outlet 12 to the oil pump; the oil pressure filter 7 is installed on the outside of the transmission housing 1 and is provided on the oil outlet side of the first oil pump 22.

[0078] The lubricating oil circuit is located outside the transmission housing 1. Its hydraulic medium passes sequentially through the transmission housing 1 oil outlet 12, the second oil pump 21, and the lubricating oil subsystem. The lubricating oil subsystem includes a first lubricating oil circuit and a second lubricating oil circuit. The first lubricating oil circuit is connected to the lubricating oil circuits of the first oil pump 22 and / or the second oil pump 21. The first oil pump 22 and the second oil pump 21 are preferably duplex gears. Oil enters the first lubricating oil circuit through the second oil pump 21 to lubricate the duplex gear pump 2. The second lubricating oil circuit is connected to the lubricating oil circuits of the transmission and / or clutch within the transmission housing 1, lubricating the transmission and clutch. The lubricated oil flows directly into the transmission housing 1.

[0079] The lubricating oil subsystem, the first control circuit, and the second control circuit valve group are integrated to form the first valve group 3. The first valve group 3 includes: a first valve body 31, a first oil inlet 32a, a second oil inlet 32b, a first port 33a, eleven second ports 33b, five first control valves 34a, six second control valves 34b, a third port 33c, a fourth port 35a, a seventh port 35b, an eighth port 35c, and a relief valve 36. The connection surface between the first valve body 31 and the end cover is defined as the first mounting surface 31a, and the other surfaces are defined as the first non-mounting surface 31b. The first oil inlet 32a is located on the first non-mounting surface 31b and is connected to the second oil pump 21 via a pipeline. The second oil inlet 32b is located on the first non-mounting surface 31b and is connected to the first oil pump 22 via a pipeline. The first interface 33a is located on the first mounting surface 31a and is connected to the second lubricating oil passage. It communicates with the first oil inlet 32a via an oil passage provided within the first valve body 31, and is connected to the lubricating oil passage of the transmission shaft, / or bearing, and / or wet clutch within the transmission housing 1. The second interface 33b is located on the first mounting surface 31a and is connected to the second oil inlet 32b via multiple parallel oil passages provided within the first valve body 31. The second interfaces 33b can be divided into two groups: one group of five interfaces is connected to the oil circuit of the clutch actuator, and the other group of six interfaces is connected to the oil circuit of the main synchronizer actuator. The first control valve 34a and the second control valve 34b are integrated into the first valve body 31 and connected in series with the parallel oil circuit where the second port 33b is located. The third port 33c is provided on the first mounting surface 31a and connects to the return oil ports of the first control valve 34a and / or the second control valve 34b. It also corresponds to the return oil port 14 provided on the transmission housing. This allows oil returned from the hydraulic subsystem to flow directly into the transmission housing 1. The fourth port 35a is provided on the first non-mounting surface 31b and communicates with the second oil inlet 32b via an oil passage provided within the first valve body 31, thereby connecting to the third control circuit. The seventh port 35b is provided on the first non-mounting surface 31b and communicates with the first oil inlet 32a via an oil passage provided within the first valve body 31. It is connected to the first lubricating oil circuit, directing oil into the duplex gear pump 2 to lubricate the duplex gear pump 2. The eighth port 35c is provided on the first non-mounting surface 31b and communicates with the first oil inlet 32a via an oil passage provided within the first valve body 31, for connection to the accumulator 5. A relief valve 36 is integrated into the first valve body 31. The control end of the relief valve 36 is connected to the oil return port, the high-pressure end is connected to the second port 33b, and the low-pressure end is connected to the first port 33a. When the oil pressure on the hydraulic oil subsystem side is too high, some oil can be diverted to the lubrication oil subsystem to relieve pressure and improve the energy utilization of the hydraulic control subsystem and the lubrication subsystem.

[0080] The valve group of the third control circuit is integrated to form at least one second valve group 4. In this embodiment, a total of three groups of second valve groups 4 with the same structure are provided, which can replace and exchange each other. The second valve group 4 includes: a second valve body 41, a third oil inlet 42, two fifth interfaces 43, two third control valves 44 and a sixth interface 45. The connection surface between the second valve body 41 and the end cover is defined as the second mounting surface 41a, and the other surfaces are defined as the second non-mounting surface 41b; the third oil inlet 42 is integrated on the second non-mounting surface 41b, and is connected to the fourth interface 35a through a pipeline to achieve connection with the first valve group 3, ensuring that each third control valve 44 is in parallel with the first control valve 34a and the second control valve 34b; the fifth interface 43 is provided on the second mounting surface 41a, and is respectively connected to the oil circuit of the actuator of the sub-synchronizer, and is provided on the second valve body 4 1 is connected to the second oil inlet 32b. The third control valve 44 is integrated with the second valve body 41 and connected in series with the parallel oil path where the second interface 33b is located, thereby controlling the two secondary synchronizer actuators. The sixth interface 45 is provided on the second mounting surface 41a and is connected to the oil return port of the second control valve 34b. It corresponds to the oil return port 14 and the oil return port 14 provided on the transmission case. The oil return from the hydraulic subsystem can flow directly into the transmission case 1.

[0081] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention that fall within the scope of the appended claims and their equivalents.

Claims

1. A hydraulic control system for a full power shift transmission, characterized in that: include: an oil tank formed inside the transmission housing and capable of containing the hydraulic medium; The hydraulic main oil circuit, whose hydraulic medium returns to the gearbox housing through the gearbox housing oil outlet, the first oil pump and the hydraulic control subsystem in sequence; The hydraulic control subsystem includes: The first control circuit includes a plurality of first control valves, each corresponding to a clutch, and connected in parallel to the main hydraulic oil circuit; the first control valves control the hydraulic medium to drive the actuator of the corresponding clutch; a second control circuit including a plurality of second control valves, one corresponding to each master synchronizer and connected in parallel to the main hydraulic oil circuit; the second control valves controlling the hydraulic medium to drive the actuator of the corresponding master synchronizer; the master synchronizer being a synchronizer that cooperates with the clutch to adjust the working mode; The third control circuit includes multiple third control valves, which correspond one to one with the auxiliary synchronizers and are connected in parallel to the hydraulic main oil circuit; the second control valve controls the hydraulic medium to drive the actuator of the corresponding auxiliary synchronizer; the auxiliary synchronizer is a synchronizer used to adjust the gear position.

2. The hydraulic control system for a full power shift transmission according to claim 1, wherein: Also includes: The accumulator is arranged in parallel on the main hydraulic oil circuit.

3. The hydraulic control system for a full power shift transmission according to claim 1, wherein: Also includes: An oil suction filter element is provided at the oil outlet of the gearbox housing or on the connecting pipeline from the oil outlet to the oil pump; The oil pressure filter is installed on the outside of the transmission case and is arranged on the oil outlet side of the first oil pump.

4. The hydraulic control system for a full power shift transmission according to claim 1, wherein: Also includes: a lubricating oil circuit, wherein the hydraulic medium passes through the oil outlet of the transmission housing, the second oil pump and the lubricating oil subsystem in sequence; The lubricating oil subsystem includes: a first lubricating oil circuit connected to the lubricating oil circuit of the first oil pump and / or the second oil pump; The second lubricating oil circuit is connected to the lubricating oil circuit of the transmission system and / or the clutch in the transmission housing.

5. The hydraulic control system for a full power shift transmission as claimed in claim 4, characterized in that: Also includes: The second lubricating oil circuit includes an annular oil channel arranged on the end cover of the transmission housing. A plurality of lubricating branches are arranged on the annular oil channel, which are respectively connected to the lubricating oil circuits of the transmission shaft and / or bearings and / or wet clutch in the transmission housing.

6. The hydraulic control system for a full power shift transmission as claimed in claim 4, characterized in that: The lubricating oil subsystem, the first control circuit, and the second control circuit valve group are integrated to form a first valve group; The valve groups of the third control circuit are integrated to form at least one second valve group.

7. The hydraulic control system for a full power shift transmission according to claim 6, wherein: The first valve group includes: A first valve body; defining the connection surface between the first valve body and the transmission housing as a first mounting surface, and the other surfaces as first non-mounting surfaces; a first oil inlet, provided on the first non-mounting surface and connected to the second oil pump via a pipeline; a second oil inlet, provided on the first non-mounting surface and connected to the first oil pump via a pipeline; a first interface, provided on the first mounting surface and connected to the first oil inlet via an oil passage provided inside the first valve body; at least two second interfaces, provided on the first mounting surface and connected to the second oil inlet via a plurality of parallel oil passages provided inside the first valve body; At least two first control valves and / or at least two second control valves are integrated on the first valve body and connected in series to the parallel oil circuit where the second interface is located; The third interface is provided on the first mounting surface, is connected to the oil return port of the first control valve and / or the second control valve, and corresponds to the oil return port provided on the transmission case housing.

8. The hydraulic control system for a full power shift transmission as claimed in claim 7, wherein: The first control valve group further includes: at least one fourth interface, provided on the first non-installation surface and connected to the second oil inlet via an oil passage provided inside the first valve body; and / or The overflow valve is integrated in the first valve body, the control end of the overflow valve is connected to the oil return port, the high-pressure end is connected to the second interface, and the low-pressure end is connected to the first interface.

9. The hydraulic control system for a full power shift transmission as claimed in claim 7, wherein: The first valve group further includes: The seventh interface is provided on the first non-installation surface and is connected to the first lubricating oil circuit.

10. The hydraulic control system for a full power shift transmission according to claim 8, wherein: The second valve group includes: The second valve body; the connection surface between the second valve body and the gearbox housing is defined as the second mounting surface, and the other surfaces are defined as the second non-mounting surfaces; a third oil inlet, integrated on the second non-mounting surface and connected to the fourth interface via a pipeline; at least two fifth interfaces, provided on the second mounting surface and connected to the second oil inlet via a plurality of parallel oil passages provided inside the second valve body; at least two third control valves, integrated on the second valve body and connected in series to the parallel oil circuit where the second interface is located; The sixth interface is provided on the second mounting surface, is connected to the oil return port of the second control valve, and corresponds to the oil return port.

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