Electrically-driven power gear shifting box responsible mechanism

Abstract

The invention discloses an electrically-driven power gear shifting box responsible mechanism, relates to the technical field of gearbox hydraulic control, and aims to solve the problems that the transmission power loss and distribution state of an automatic gearbox oil pressure system are fuzzy, and the power consumption coupling performance of oil way pressure relief regulation and control transmission double ends is high. By arranging the main oil pressure adjusting valve, the main adjusting valve element and the pressure relief channel, the power overflow loss and the upper limit of lubricating oil pressure are reduced, the power precision of recycling pressure relief and drainage is improved, and the energy-saving effect and the process design optimization performance of the automatic gearbox are improved. By arranging the first adjusting channel, the second adjusting channel, the proportional electromagnetic valve and the main valve element spring, the oil pressure power consumption coupling performance of the automatic gearbox is reduced, and the expansion performance of the compact structure and automatic control of the automatic gearbox is improved; the proportion of the power consumed by lubricating and cooling flow supply relative to the oil pressure oil supply power of the main oil pressure system is reduced, and the stability of the automatic gearbox in the gear shifting process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gearbox hydraulic control, and in particular to a power shift box responsible mechanism for electric drive. Background Art

[0002] Automatic transmission, referred to as main oil circuit AT, is composed of a torque converter, planetary gears and a hydraulic control system. It achieves speed and torque change through hydraulic transmission and gear combination. Compared with manual transmission, automatic transmission is very different in structure and use. Manual transmission mainly changes gears by adjusting different gear combinations, while automatic transmission achieves speed change through hydraulic transmission and gear combination. At present, the transmission system of construction machinery has begun to transform towards electrification. The domestic electrified transmission system suitable for construction machinery is basically vacant. Most of the transmissions matched with traditional fuel systems are manual transmissions. There is power interruption during gear shifting, which will lead to poor comfort during the gear shifting process. In the process of receiving hydraulic drive by the fluid pressure actuator of the oil circuit system, more unclear power loss may occur, thereby reducing the efficiency of the fluid working system.

[0003] In the prior art, in the hydraulic oil circuit system of the automatic transmission, the lubrication and cooling oil circuit and the main oil pressure actuator drive oil circuit are usually integrated into one oil circuit system to reduce the volume of the automatic transmission oil circuit control components and the difficulty of automatic oil pressure control. However, the utilization effect of the overflow and pressure relief oil circuit of the existing main control oil circuit system is poor, the number of control components is large, and the oil pressure control accuracy is low and the control method is relatively complex, which is not conducive to the high-performance operation of the transmission hydraulic system; the power distribution of the automatic transmission oil pressure between the execution oil circuit subsystem and the pressure regulating and lubricating oil circuit subsystem is relatively vague, and the power loss in the oil pressure transmission process is relatively vague. By comparing the power supplied by the conventional oil pressure system pressure and the power consumption of the actuator, it is difficult to determine the overall efficiency of the transmission oil pressure system and the consumption after pressure regulation and transmission, which is not conducive to the performance and improvement of the transmission.

[0004] In the prior art, for example, Japanese invention patent JP2017207134A discloses a control method and control device for an automatic transmission. In this technical solution, the oil circuit control system uses two proportional electromagnetic control valves to adjust the oil circuit pressure and guide of the pressure reducing valve. The oil pressure of the output oil circuit is controlled according to the pressure setting of the pressure reducing valve and the regulation ratio of the proportional electromagnetic valve. The control effect of the proportional electromagnetic valve directly affects the control accuracy of the output oil pressure of the pressure reducing valve. In this invention patent, the oil pressure control unit may have higher electromagnetic control requirements for the coordination ability between the control points of the electromagnetic valve, and the dynamic balance of the oil pressure formed by the sliding of the valve core of the pressure reducing valve by the output oil pressure feedback control may produce higher vibration shock, and the power transmission and distribution fuzziness of the oil circuit system may be higher, which may easily lead to unstable control, resulting in greater power loss of oil pressure regulation in the oil circuit system.

[0005] For example, Chinese invention patent CN115182990B discloses a hydraulic control system for a hybrid hydraulic automatic transmission. In this invention patent, the main oil circuit regulating valve adopts a pilot pressure control method, and the oil pressure of the main oil circuit pressure control valve is pilot-limited by an independent solenoid valve. The oil pressure regulation process of the oil circuit system is first controlled in a pilot form, and the flow quality of the oil may be required to be high, which may cause the hydraulic transmission of the oil circuit drive shifting, friction engagement and other actuators to be untimely and unsmooth. Summary of the invention

[0006] The purpose of the present invention is to provide a power shift box responsible mechanism for electric drive, so as to overcome the shortcomings of the prior art such as the loss and fuzzy distribution state of power transmission of the automatic transmission oil pressure system, and the high power consumption coupling of the oil circuit pressure relief control transmission at both ends.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A power shift box for electric drive, comprising an oil tank, an oil filter and an oil pump, wherein the output end of the oil pump is fixedly connected to a main oil circuit A, and the output end of the main oil circuit A is fixedly connected to a hydraulic actuator; A main oil pressure regulating valve is fixedly connected to the main oil circuit A. A pressure relief channel is arranged in the main oil pressure regulating valve. A main regulating valve core is slidably connected in the main oil pressure regulating valve. The pressure relief channel includes a pressure relief inlet port and a pressure relief outflow port. The main regulating valve core controls the conductance opening state of the pressure relief channel. The pressure relief inlet port is connected to the main oil circuit A. The pressure relief channel is used for hydraulic discharge of the main oil circuit A.

[0008] Preferably, the conduction opening degree of the pressure relief channel changes in a linear manner; By setting the main oil pressure regulating valve, the main regulating valve core, the pressure relief channel, the main oil circuit A and the cooling lubricating oil circuit B, the requirements of the oil circuit system on the purity of the flowing pressure oil are reduced, the power overflow loss and the upper limit of the lubricating oil pressure are reduced, and the power consumption of pressure relief and flow discharge during the pressure regulation process is reduced; It can improve the power accuracy of the pressure relief and flow discharge of the recycling main oil pressure system, improve the power transmission distribution accuracy of the automatic transmission oil pressure system, and improve the energy saving effect and process design optimization performance of the automatic transmission.

[0009] Preferably, the pressure relief outflow port is fixedly connected to a cooling lubricating oil circuit B, the output end of the cooling lubricating oil circuit B is fixedly connected to a lubrication cooling execution system, a cooling component is provided on the cooling lubricating oil circuit B, and the cooling lubricating oil circuit B provides lubrication cooling oil pressure; It can effectively reduce the number of components and oil pressure control points of the oil pressure system, reduce the control complexity of the automatic transmission oil pressure system, and improve the accuracy of the power distribution limit of the oil pressure system; The power consumption coupling of the oil pressure system of the automatic transmission is reduced, and the working conditions of the automatic transmission of the integrated oil pressure system are improved.

[0010] Preferably, a first regulating channel and a second regulating channel are provided in the main oil pressure regulating valve, and control oil pressure is provided in both the first regulating channel and the second regulating channel; Preferably, a main valve core spring is provided in the main oil pressure regulating valve, and the main valve core spring provides an elastic thrust for regulating the oil circuit pressure, and the elastic thrust provides a tendency to reduce the opening of the pressure relief channel; By setting the first regulating channel, the second regulating channel and the main oil pressure regulating valve, the pressure regulation accuracy and the pressure regulation response speed can be improved, the gear shifting pressure supply performance and the automatic control effect of the hydraulic discharge can be improved, the maintenance cost and the transformation pressure can be reduced, and the compact structure of the automatic transmission and the expansion performance of automatic control can be improved.

[0011] Preferably, the main oil circuit A is fixedly connected with the second regulating oil circuit F and the first regulating oil circuit D, the output end of the first regulating oil circuit D is fixedly connected with the first regulating channel, the output end of the second regulating oil circuit F is fixedly connected with the proportional solenoid valve, the output end of the proportional solenoid valve is fixedly connected with the proportional regulating oil circuit G, the output end of the proportional regulating oil circuit G is fixedly connected with the second regulating channel, and the main valve core spring is located in the second regulating channel; By providing a main oil circuit A, a second regulating oil circuit F, a first regulating oil circuit D, a proportional regulating oil circuit G, a proportional solenoid valve and a main valve core spring, while ensuring the lubrication and cooling supply, the proportion of the power consumed by the lubrication and cooling supply relative to the oil pressure supply power of the main oil pressure system is reduced, thereby improving the transmission and distribution accuracy of the power of the automatic transmission oil pressure system; reducing the amplitude of the oil pressure pulsation shock to the oil pressure system, thereby improving the smoothness of the automatic transmission shifting process and the oil pressure control extreme value.

[0012] Preferably, the hydraulic actuator includes an electromagnetic control valve and an oil pressure actuator, the output end of the main oil circuit A is fixedly connected to the electromagnetic control valve, the output end of the electromagnetic control valve is fixedly connected to the execution oil circuit C and the retreat oil circuit H, the oil pressure actuator is connected to the execution oil circuit C, and the output end of the retreat oil circuit H is fixedly connected to the exhaust valve; It improves the convenience and accuracy of oil pressure transmission in the oil pressure system, reduces the power consumption of electromagnetic controlled oil pressure proportional transmission, improves the analysis accuracy of effective power, and reduces the oil pressure power consumption of automatic transmission.

[0013] Preferably, an oil pressure feedback sensor is fixedly connected to the execution oil circuit C, and the solenoid control valve is a proportional control solenoid valve.

[0014] Preferably, an accumulator is fixedly connected to the execution oil circuit C; By arranging the electromagnetic control valve, the hydraulic actuator, the accumulator, the main oil circuit A, the execution oil circuit C and the return oil circuit H, the accuracy of the power transmission distribution state of the hydraulic system is improved, the power loss of the main hydraulic system is reduced, and the influence of the oil pressure pulsation on the operating state of the hydraulic actuator is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the overall arrangement of the responsible mechanism of an electric drive power shift box of the present invention; Figure 2 It is a schematic diagram of the hydraulic connection relationship at the main regulating valve core; Figure 3 It is a schematic diagram of the hydraulic connection at the shift actuator.

[0017] Figure numbers: oil tank 10; oil filter 11; oil pump 12; main oil pressure sensor 13; solenoid control valve 14; oil pressure actuator 15; oil pressure feedback sensor 16; accumulator 17; exhaust valve 18; proportional solenoid valve 20; main oil circuit A; cooling and lubrication oil circuit B; execution oil circuit C; first control oil circuit D; overflow oil circuit E; second control oil circuit F; proportional control oil circuit G; main oil pressure regulating valve 30; main regulating valve core 31; main valve core spring 33; first regulating channel 34; pressure relief inlet port 35; pressure relief outflow port 36; second regulating channel 37; overflow valve 41; cooling component 42; lubrication cooling execution system 43; return oil circuit H. DETAILED DESCRIPTION

[0018] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0019] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] Embodiment 1 See attached Figure 1 To Attachment Figure 3 As shown, the present invention provides a power shift box responsible mechanism for electric drive, including an oil tank 10, an oil filter 11 and an oil pump 12. The input end of the oil pump 12 is connected to the oil tank 10 through a pipeline, and the oil filter 11 filters and purifies the pressure oil pumped and circulated by the oil pump 12; the output end of the oil pump 12 is fixedly connected to the main oil circuit A, and the output end of the main oil circuit A is fixedly connected to the hydraulic actuator. The main oil circuit A provides working oil pressure to the hydraulic actuator such as the shift clutch, and the oil pump 12 is an electric oil pump; A main oil pressure regulating valve 30 and a main oil pressure sensor 13 are fixedly connected to the main oil circuit A. A pressure relief channel is provided in the main oil pressure regulating valve 30. A main regulating valve core 31 is slidably connected in the main oil pressure regulating valve 30. The pressure relief channel includes a pressure relief inlet port 35 and a pressure relief outflow port 36. The main regulating valve core 31 controls the opening state of the pressure relief channel. The larger the opening, the greater the discharge flow of the pressure relief channel. The pressure relief inlet port 35 is connected to the main oil circuit A. The pressure relief channel is used for hydraulic discharge of the main oil circuit A to reduce the pressure of the hydraulic oil in the oil circuit. When the oil pressure in the main oil circuit is higher than the set value, the pressure of the main oil circuit A is reduced by discharging. The oil pressure exceeding the set value delivered to the main oil circuit A by the oil pump 12 is stabilized at the set value after the discharge, thereby regulating the oil pressure of the main oil circuit A. The conductance opening of the pressure relief channel changes in a linear manner; The oil pressure system of the automatic transmission includes: the main oil pressure system where the main oil circuit A supplies oil to the hydraulic actuator, the lubricating oil pressure system where the cooling lubricating oil circuit B supplies oil to the lubricating cooling actuator system 43; the pressure regulating system where the main oil pressure regulating valve 30 and the pressure relief channel and other regulating components transmit and regulate the pressure oil of the main oil pressure system; The pressure relief channel is used to recover the power of the main oil pressure system in the automatic transmission, and guide the hydraulic oil leaked through the pressure relief channel to be used for lubrication and / or cooling of the lubricating oil pressure system; by setting the main oil pressure regulating valve 30, the main regulating valve core 31 and the pressure relief channel, the oil pressure and flow of the main oil pressure system are orderly reused; the direct-acting adjustment of the opening state of the pressure relief channel reduces the requirements of the oil circuit system on the purity of the flowing pressure oil, and accurately controls the discharge flow of the pressure relief of the main oil circuit A in the main oil pressure system; The main oil supply power of the automatic transmission oil pressure system is used in the main oil pressure system where the hydraulic actuator is located, and the power of the oil supply pressure recovered from the main oil pressure system is used for lubrication and / or cooling of the lubricating oil pressure system, thereby reducing the power overflow loss and upper limit of the lubricating oil pressure system after providing appropriate lubrication and / or cooling oil pressure, and reducing the power consumption of the main oil pressure regulating valve 30 and other regulating components in the process of pressure relief and flow discharge; According to the actual power consumption of the oil circuit pressure regulation and leakage for cooling and / or lubrication, the actual effective power of the oil pressure supply of the gearbox oil pressure system is judged by feedback, so as to clarify the power distribution of the gearbox oil pressure system in the oil circuit system and the pressure regulation system where the main oil circuit A is located, and clarify the power loss in the oil pressure transmission process of the pressure relief and leakage; it can improve the power accuracy of recycling the pressure relief and leakage of the main oil pressure system, avoid power waste of the main oil pressure system, thereby improving the power transmission distribution accuracy of the automatic transmission oil pressure system, and improving the efficiency of the automatic transmission oil pressure system; it can improve the energy saving effect and process design optimization performance of the automatic transmission oil pressure system.

[0022] The pressure relief outflow port 36 is fixedly connected to a cooling lubricating oil circuit B, the output end of the cooling lubricating oil circuit B is fixedly connected to a lubricating cooling execution system 43, a cooling assembly 42 is provided on the cooling lubricating oil circuit B, a relief valve 41 is fixedly connected to the cooling lubricating oil circuit B, the cooling assembly 42 and the cooling assembly 42 are both located between the lubricating cooling execution system 43 and the pressure relief outflow port 36, and the cooling lubricating oil circuit B provides lubricating and / or cooling oil pressure for lubricating execution components such as the lubricating cooling execution system 43; The pressure relief passages of the overflow oil circuit E and the cooling lubricating oil circuit B are used to connect the main oil pressure system where the main oil circuit A is located and the lubricating oil pressure system where the cooling lubricating oil circuit B is located, guide the pressure oil power transmission of the pressure regulating system and use it for the lubricating oil pressure system, integrate the oil pressure system oil circuits of the main oil pressure system and the lubricating oil pressure system, and separate the power of the lubricating oil pressure system transmitted by the pressure relief of the automatic transmission main oil pressure system, which can effectively reduce the number of components and oil pressure control points of the automatic transmission oil pressure system, thereby reducing the control complexity of the automatic transmission oil pressure system, improving the accuracy of the power distribution limit of the automatic transmission oil pressure system with integrated oil circuits, and further improving the energy-saving effect and process design optimization performance of the automatic transmission oil pressure system; In addition, the main regulating valve core 31 is directly-acting and has an opening state that is adjusted. Under low-pressure conditions, the pressure relief channel can be easily opened by sliding the main regulating valve core 31 as needed, and the leakage of the main oil pressure system is used to supply the lubricating oil pressure system where the cooling lubricating oil circuit B is located, and the power consumption of the transmission ends of the pressure regulating system is separated, so that the lubricating cooling oil pressure of the lubricating oil pressure system of the automatic transmission integrated oil circuit can be maintained under low oil pressure conditions; while keeping the oil pressure stable at the set value, the flow supply accuracy of the lubricating cooling under low oil pressure conditions is improved, the double-end coupling power of the automatic transmission pressure relief flow transmission is separated, the power consumption coupling of the oil pressure system of the automatic transmission is reduced, the working conditions of the automatic transmission of the integrated oil pressure system are improved, and the lubricating cooling power consumption is reduced, thereby improving the efficiency of the oil pressure system of the automatic transmission.

[0023] The main oil pressure regulating valve 30 is provided with a first regulating channel 34 and a second regulating channel 37, and the first regulating channel 34 and the second regulating channel 37 are both provided with control oil pressure for switching the opening state of the pressure relief channel; A main valve core spring 33 is provided in the main oil pressure regulating valve 30, and the main valve core spring 33 provides an elastic thrust for regulating the oil pressure, and the elastic thrust provides a tendency for the main regulating valve core 31 to reduce the opening state of the pressure relief channel; The pressure difference between the first regulating channel 34 and the second regulating channel 37 drives the switching of the opening state of the pressure relief channel, which can improve the pressure regulation accuracy and pressure regulation response speed, improve the automatic transmission shift speed and smoothness, improve the shift pressure supply performance and the automatic control effect of hydraulic discharge, reduce the number of control points and control difficulty of the automatic transmission oil pressure system, reduce maintenance costs and transformation pressure, and improve the compact structure of the automatic transmission and the expansion performance of automatic control; The spring absorbs part of the dynamic impact pressure and vibration during pressure regulation in the pressure relief channel, reduces part of the oil pressure pulse in the oil circuit of the pressure regulating system, and increases the service life of the oil pressure system components.

[0024] The main oil circuit A is fixedly connected with the second regulating oil circuit F and the first regulating oil circuit D, the output end of the first regulating oil circuit D is fixedly connected with the first regulating channel 34, the output end of the second regulating oil circuit F is fixedly connected with the proportional solenoid valve 20, the output end of the proportional solenoid valve 20 is fixedly connected with the proportional regulating oil circuit G, the output end of the proportional regulating oil circuit G is fixedly connected with the second regulating channel 37, and the main valve core spring 33 is located in the second regulating channel 37; After the proportional solenoid valve 20 reduces the pressure oil proportion input from the second regulating oil circuit F, it outputs a fixed value of control oil pressure to the second regulating channel 37 through the proportional regulating oil circuit G. The oil pressure in the second regulating channel 37 and the elastic force of the main valve core spring 33 together constitute the first thrust of the main regulating valve core 31 to reduce the opening size of the pressure relief channel. The first regulating oil circuit D guides the oil pressure in the main oil circuit A into the first regulating channel 34. The oil pressure in the first regulating channel 34 provides the main regulating valve core 31 with a second thrust to increase the opening size of the pressure relief channel. The main regulating valve core 31 is pushed to slide under the combined force of the two vector thrusts. The second thrust generated by the oil pressure of the main oil circuit A detected by the main oil pressure sensor 13 in the first regulating channel 34 must be greater than the set first thrust to open the pressure relief channel, otherwise the oil pressure in the main oil circuit A is the oil pressure value detected by the main oil pressure sensor 13 and provided by the oil pump 12; When the oil pressure in the main oil circuit A detected by the main oil pressure sensor 13 exceeds the set value and has a surplus pressure value greater than the elastic force generated by the stiffness of the main valve core spring 33, the pressure oil in the main oil circuit A can be discharged to the cooling lubricating oil circuit B through the pressure relief channel, thereby meeting the minimum lubrication supply flow requirement; By setting the proportional solenoid valve 20, the proportional regulating oil circuit G, the second regulating channel 37 and the main valve core spring 33, the oil pressure pulse of the oil circuit can be used for lubrication and cooling supply on the basis of ensuring accurate regulation of the oil circuit pressure; or on the basis of setting the oil pressure, the control oil pressure in the second regulating channel 37 can be adjusted by the proportional solenoid valve 20 to increase the driving speed of the oil pump 12 to meet the lubrication and cooling supply state; The main valve core spring 33 absorbs and utilizes a part of the oil pressure pulse of the main oil pressure system, while ensuring the lubrication and cooling flow supply, reducing the proportion of the power consumed by the lubrication and cooling flow supply relative to the oil pressure supply power of the main oil pressure system, further improving the efficiency of the automatic transmission oil pressure system, further improving the transmission and distribution accuracy of the power of the automatic transmission oil pressure system, and improving the oil pressure control stability of the integrated oil circuit of the automatic transmission; The requirements for spring stiffness of oil pressure regulation are reduced, which further reduces component costs. At the same time, the amplitude of oil pressure pulsation impact on the oil pressure system is reduced, which further improves the stability of the oil pressure system and the smoothness of the automatic transmission shifting process; In addition, by setting the main valve core spring 33, when the proportional solenoid valve 20 outputs the same oil pressure and similar pressure force as those input into the first regulating channel 34 through the proportional regulating oil circuit G, the first thrust can be not less than the second thrust with the assistance of the spring force of the main valve core spring 33, so that the main regulating valve core 31 will never slide to open the pressure relief channel, thereby improving the oil pressure regulation extreme value of the oil pressure system.

[0025] The hydraulic actuator includes an electromagnetic control valve 14 and an oil pressure actuator 15. The output end of the main oil circuit A is fixedly connected to the electromagnetic control valve 14. The output end of the electromagnetic control valve 14 is fixedly connected to the execution oil circuit C and the retreat oil circuit H. The oil pressure actuator 15 is in communication with the execution oil circuit C. The output end of the retreat oil circuit H is fixedly connected to the exhaust valve 18. The exhaust valve 18 removes bubbles in the hydraulic oil that flows back to the oil tank. After the oil pressure ratio transmitted by the main oil circuit A is reduced by the electromagnetic control valve 14, it is transmitted to the oil pressure actuator 15 through the execution oil circuit C to drive the hydraulic actuator to execute the oil pressure control action; the electromagnetic control valve 14 detects the regulated oil pressure value through the main oil pressure sensor 13, cooperates with the predetermined hydraulic actuator working oil pressure, reduces the oil pressure according to the set ratio and outputs it to the hydraulic actuator to drive the execution action; it can adapt to the different working oil pressures provided for a variety of actuators, can improve the convenience and accuracy of the oil pressure transmission of the gearbox oil pressure system, reduce the power consumption of the electromagnetic control oil pressure proportional transmission, improve the analysis accuracy of the effective power output to the driving hydraulic actuator, and further reduce the power loss of the automatic transmission oil pressure system.

[0026] An oil pressure feedback sensor 16 is fixedly connected to the execution oil circuit C, and the solenoid control valve 14 is a proportional control solenoid valve; An accumulator 17 is fixedly connected to the execution oil circuit C; The electromagnetic control valve 14 linearly reduces and transmits the oil pressure to the hydraulic actuator and other fluid working systems for control according to the closed-loop feedback signal of the oil pressure feedback sensor 16. The oil pressure transmitted by the electromagnetic control valve 14 can clearly determine the actual power loss relationship of the oil pressure transmitted and output after the conversion, thereby further improving the boundary between the actual power of the hydraulic actuator and the output power of the oil pressure system, facilitating the improvement of the accuracy of the power transmission distribution state of the automatic transmission oil pressure system, and assisting in analyzing the boundary between the loss power and the effective power in the oil pressure transmission process, thereby further improving the energy-saving effect and process design optimization performance of the automatic transmission oil pressure system; In addition, the solenoid control valve 14 dynamically adjusts the determined oil pressure output by the execution oil circuit C according to the feedback control of the oil pressure feedback sensor 16 and the pulse buffering absorption of the accumulator 17, thereby reducing the power loss of the main oil pressure system transmitting the oil pressure to the hydraulic actuator, reducing the influence of the oil pressure pulsation of the main oil pressure system on the operating state of the hydraulic actuator, and improving the performance and operating conditions of the automatic transmission oil pressure system.

[0027] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes made by a person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A power shift box mechanism for electric drive, comprising an oil tank (10), an oil filter (11) and an oil pump (12), wherein the output end of the oil pump (12) is fixedly connected to a main oil circuit A, and the output end of the main oil circuit A is fixedly connected to a hydraulic actuator, characterized in that: A main oil pressure regulating valve (30) is fixedly connected to the main oil circuit A. A pressure relief passage is provided in the main oil pressure regulating valve (30). A main regulating valve core (31) is slidably connected in the main oil pressure regulating valve (30). The pressure relief passage comprises a pressure relief inflow port (35) and a pressure relief outflow port (36). The main regulating valve core (31) controls the conduction opening state of the pressure relief passage. The pressure relief inflow port (35) is connected to the main oil circuit A. The pressure relief passage is used for hydraulic discharge of the main oil circuit A.

2. A power shift box mechanism for electric drive as claimed in claim 1, characterized in that: The conductance opening degree of the pressure relief channel changes in a linear manner.

3. An electric drive power shift box responsible mechanism as described in any one of claims 1 to 2, characterized in that: The pressure relief outflow port (36) is fixedly connected to a cooling lubricating oil circuit B, an output end of the cooling lubricating oil circuit B is fixedly connected to a lubricating cooling execution system (43), a cooling assembly (42) is provided on the cooling lubricating oil circuit B, and the cooling lubricating oil circuit B provides lubricating cooling oil pressure.

4. A power shift box mechanism for electric drive as claimed in claim 3, characterized in that: The main oil pressure regulating valve (30) is provided with a first regulating channel (34) and a second regulating channel (37), and the first regulating channel (34) and the second regulating channel (37) are both provided with control oil pressure.

5. A power shift box mechanism for electric drive as claimed in claim 4, characterized in that: A main valve core spring (33) is provided in the main oil pressure regulating valve (30), and the main valve core spring (33) provides an elastic thrust for regulating the oil circuit pressure, and the elastic thrust provides a tendency to reduce the opening of the pressure relief channel.

6. A power shift box mechanism for electric drive as claimed in claim 5, characterized in that: The main oil circuit A is fixedly connected to a second regulating oil circuit F and a first regulating oil circuit D; an output end of the first regulating oil circuit D is fixedly connected to the first regulating channel (34); an output end of the second regulating oil circuit F is fixedly connected to a proportional solenoid valve (20); an output end of the proportional solenoid valve (20) is fixedly connected to a proportional regulating oil circuit G; an output end of the proportional regulating oil circuit G is fixedly connected to the second regulating channel (37); and the main valve core spring (33) is located in the second regulating channel (37).

7. The electric drive power shift box responsible mechanism as claimed in claim 3, characterized in that: The hydraulic actuator comprises an electromagnetic control valve (14) and a hydraulic actuator (15); the output end of the main oil circuit A is fixedly connected to the electromagnetic control valve (14); the output end of the electromagnetic control valve (14) is fixedly connected to an execution oil circuit C and a retraction oil circuit H; the hydraulic actuator (15) is in communication with the execution oil circuit C; and the output end of the retraction oil circuit H is fixedly connected to an exhaust valve (18).

8. The electric drive power shift box mechanism as claimed in claim 7, characterized in that: An oil pressure feedback sensor (16) is fixedly connected to the execution oil circuit C, and the electromagnetic control valve (14) is a proportional control electromagnetic valve.

9. The electric drive power shift box mechanism as claimed in claim 8, characterized in that: An accumulator (17) is fixedly connected to the execution oil circuit C.

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