Pressure negative feedback type flow synchronization controller and application

Abstract

The application discloses a pressure negative feedback type flow synchronous controller and application, which comprises a cylinder assembly and end covers installed at two ends of the cylinder assembly, and the outer sides of the two end covers are provided with supporting legs; an oil chamber is formed in the cylinder assembly, and a piston assembly is horizontally arranged in the oil chamber; the piston assembly divides the oil chamber into two symmetrical cavities, springs are arranged in the two cavities, and the springs are sleeved on piston rods in the piston assembly; the oil chamber is divided into two cavities, and the test gearbox, the transfer oil tank and the clean oil tank are communicated, so that the synchronization of the contaminated oil liquid output and the clean oil liquid input of the test gearbox is realized; when the oil liquid pressure discharged from the gearbox fluctuates and decreases, the piston rod assembly in the oil chamber can automatically return to the middle position under the actions of the two springs and the oil pressure, and when the balance state is reached, the input and output flows of the left and right sides of the automatic controller are equal.

Description

TECHNICAL FIELD

[0001] The present application relates to the gearbox processing technical field, specifically relates to a pressure negative feedback type flow synchronization controller and application. BACKGROUND

[0002] The gearbox belongs to the important and mature accessories in the vehicle enterprise industry. In order to effectively improve the cleanliness of the gearbox, carry away the residual pollutants in the gearbox and a large amount of heat generated in the test process, the current popular method in the industry is to use the oil replacement method. That is, a certain amount of oil is extracted from the test gearbox per unit time during the operation of the gearbox, and at the same time, a constant displacement oil pump is used to inject an equal amount of clean test oil into the gearbox, and the clean oil is used to continuously flush the inner wall of the gearbox and the parts in the gearbox. If the extraction amount of test oil is not equal to the injection amount, the oil level in the gearbox is too low, which will cause the gearbox to burn out, otherwise it will cause the oil to overflow, pollute the environment and cause waste of oil.

[0003] In order to realize the equal amount of extraction and injection, an oil replacement step is usually set separately in the test procedure of the gearbox, and the test is carried out in a constant condition. The oil circuit design usually sets two throttle valves at the outlet and inlet of the gearbox, and adjusts the opening degree of the throttle valve to realize the approximate balance of the flow. However, during the test of the gearbox, the test oil flow and pressure in the external circulation oil circuit change accordingly with the change of the test condition, which means that the opening degree of the throttle valve needs to be adjusted manually several times when the test condition is switched, so as to realize the relative balance of the input oil and the output flow.

[0004] However, the main disadvantage of this method is that it needs manual intervention repeatedly, the labor intensity is large, and it can only meet the test of single step and short time, and cannot meet the balance requirement of the inlet and outlet flow of the gearbox in multi-step and long time test, which is easy to cause the test gearbox to burn out or the oil to overflow and pollute the workpiece and the surrounding environment.

[0005] Based on the present application, a pressure negative feedback type flow synchronization controller and application are provided. The test gearbox, the transfer tank and the clean oil tank are connected by the synchronization controller to realize the cleaning of the gearbox and solve the above problems. SUMMARY

[0006] The present application aims to provide a pressure negative feedback type flow synchronization controller and application to solve the problems in the background art.

[0007] To achieve the above purpose, the present application provides the following technical scheme:

[0008] A pressure negative feedback type flow synchronization controller and application, comprising a cylinder assembly and end covers installed at both ends of the cylinder assembly, the outer sides of both end covers are provided with supporting legs, an oil chamber is formed in the cylinder assembly, and a piston assembly is transversely arranged in the oil chamber;

[0009] The piston assembly divides the oil chamber into two symmetrical cavities, springs are arranged in both cavities, and the springs are sleeved on the piston rods in the piston assembly; a variable throttling mechanism is formed between the end cover and the piston rod in the same cavity, two throttling joints with the same throttling aperture are arranged at the outlets of the two cavities, and the oil pressure is equalized through the two variable throttling mechanisms, so that the transient flow of the oil flowing out of the two fixed throttling joints is equalized.

[0010] One of the cavities is used for guiding the contaminated oil out of the test gearbox, and the other cavity is used for guiding the clean oil into the test gearbox.

[0011] As a further scheme of the application, an oil channel groove is arranged in the end cover, one end of the oil channel groove is connected with the oil inlet joint, the other end of the oil channel groove is matched with the piston assembly, at least one group of oil passing holes are formed in the inner side of the end cover, and the oil channel groove is communicated with the corresponding cavity through the oil passing holes.

[0012] As a further scheme of the application, a wrench groove and a positioning groove for connecting with the supporting leg are formed in the outer end of the end cover.

[0013] As a further scheme of the application, a waist-shaped hole and a liquid equalizing groove are formed in the outer circumferential surface of the piston rod, and the liquid equalizing groove is formed in the outer surface of the piston rod on both sides of the waist-shaped hole.

[0014] The two ends of the piston rod are gap-fitted with the oil channel groove in the end cover.

[0015] As a further scheme of the application, the piston rod is transversely fixed on the piston in the piston assembly, and an axial shoulder for limiting the piston is arranged at the middle position of the piston rod.

[0016] As a further scheme of the application, the piston has a circular ring structure, the two side surfaces are concave, and the two side surfaces abut against the springs; a circular ring groove one is formed in the middle of the outer circumferential surface of the piston, a sealing ring is sleeved on the circular ring groove one; two groups of circular ring grooves two are formed in the outer circumferential surface of the piston, the circular ring groove one is located between the two groups of circular ring grooves two, and a supporting ring is sleeved on the circular ring groove two.

[0017] As a further scheme of the application, the spring is selected from a helical spring.

[0018] As a further scheme of the present application: the cylinder assembly comprises an outer cylinder, two groups of oil outlets are symmetrically arranged on the outer arc surface of the outer cylinder and are offset to the two ends, and the two groups of oil outlets are respectively communicated with the two cavities; two throttle joints are respectively arranged on the two groups of oil outlets, and a hollow groove connected with the end cover is arranged on the inner arc surface of the outer cylinder.

[0019] As a further scheme of the present application: the mounting circular hole for mounting the end cover is arranged at the middle position of the supporting leg, the positioning holes are arranged at the bottom of the two ends of the supporting leg and the middle of the top, and the positioning hole at the middle of the top is used for limiting the end cover through the screw.

[0020] The application of a pressure negative feedback type flow synchronous controller is used for oil replacement of a gearbox or a torque converter or a hydraulic coupler.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] I. By separating the oil chamber into two cavities and connecting the test gearbox, the transfer oil tank and the clean oil tank, the synchronization of the contaminated oil outflow and the clean oil inflow of the test gearbox is realized; when the oil pressure of the outflow of the gearbox fluctuates and decreases, the piston rod assembly in the oil chamber can automatically return to the middle position under the action of the springs and the oil pressure on both sides, and when the balance state is reached, the input and output flows on the left and right sides of the automatic controller are automatically kept equal, thereby providing an oil amount automatic balancing device capable of automatically balancing the equal amount of outflow and inflow; the application can meet the oil replacement demand of multiple work steps during the factory test of the test gearbox, the torque converter and the hydraulic coupler, and improve the cleanliness of the test gearbox.

[0023] II. Under the action of the right (left) spring and the oil pressure, the force of the left (right) spring and the oil pressure on the piston rod assembly is overcome, so that the piston can return to the middle position until the input and output flows on both sides are equal; the above structure can avoid the problems of oil overflow pollution of the environment and increased oil cost caused by the unequal amount of injected oil and extracted oil during oil replacement.

[0024] III. The use of the application can avoid the phenomenon of test gearbox damage caused by the low liquid level in the test gearbox during oil replacement, and solve the contradiction between the required time of working condition test and the insufficient adjustment accuracy of the opening degree of the throttle valve adjusted by manual adjustment.

[0025] The two throttle connectors are arranged, the throttle apertures of the two throttle connectors are equal, and the oil output of the two cavities is balanced; meanwhile, the throttle structure is arranged in the two cavities, that is, the throttle structure formed between the two end covers and the connecting piston rods, the throttle channels formed between the waist-shaped holes, the oil channel grooves and the oil passing holes on the piston rods are self-adaptive to adjust under the changing oil pressure, and then the oil output can be controlled, so that the oil output of the two cavities is balanced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic view of the pressure negative feedback type flow synchronous controller of the application;

[0027] Figure 2 It is a sectional view of the application Figure 1

[0028] Figure 3 It is a structural schematic view of the foot of the application

[0029] Figure 4 It is a structural schematic view of the end cover of the application

[0030] Figure 5 It is a sectional view of the end cover of the application

[0031] Figure 6 It is a structural schematic view of the spiral spring of the application

[0032] Figure 7 It is a structural schematic view of the piston assembly of the application

[0033] Figure 8 It is a structural schematic view of the piston of the application

[0034] Figure 9 It is a structural schematic view of the piston rod of the application

[0035] Figure 10 It is a partial sectional view of the cylinder assembly of the application

[0036] The reference signs are as follows: 101, foot; 102, end cover; 1021, positioning groove; 1022, wrench groove; 1023, oil channel groove; 1024, oil passing hole; 103, spiral spring; 104, supporting ring; 105, sealing ring; 106, screw; 108, throttle connector; 109, cylinder assembly; 1091, outer cylinder; 1092, oil outlet; 1093, empty groove; 111, oil inlet connector; 113, oil chamber; 114, piston assembly; 1141, piston; 1142, piston rod; 1143, shaft shoulder; 1144, waist-shaped hole; 1145, liquid equalizing groove. DETAILED DESCRIPTION

[0037] ​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0038] With reference to Figure 1 A pressure negative feedback type flow synchronous controller includes a cylinder assembly 109 and end covers 102 installed at both ends of the cylinder assembly; an oil inlet joint 111 is connected to the middle of the outer end of the two end covers 102, and supporting legs 101 are installed on the outer sides of the two end covers, and two throttle joints 108 are connected to the top of the cylinder assembly 109.

[0039] When installing, the operator can connect the left oil inlet joint 111 to the test gearbox and the right oil inlet joint to the clean oil tank. Figure 2 Then, the left throttle joint 108 is connected to the transfer tank, and the right throttle joint is connected to the test gearbox (the left and right directions refer to the directions in Figure 2 The contaminated oil from the test gearbox enters the transfer tank through the left oil inlet joint 111 of the controller body, and at the same time, the oil in the clean oil tank enters the test gearbox through the right oil inlet joint of the controller body, thereby realizing the synchronous operation of the contaminated oil outflow and the clean oil inflow. It should be noted that since the controller body is symmetrical, the installation direction can be selected according to the operator's needs. The above installation method is only one of the installation methods.

[0040] With reference to Figure 2 The cylinder assembly 109 is provided with an oil chamber 113 and a piston assembly 114 transversely arranged in the oil chamber. The piston assembly 114 divides the oil chamber 113 into two groups of symmetrically distributed cavities, and springs are arranged in the two cavities. The springs are sleeved on the piston assembly 114 in the two cavities. It should be noted that the springs can be selected to use the coil springs 103, which are selected by the operator. The oil inlet of one group of cavities is connected to the gearbox, and the oil outlet is connected to the transfer tank. The oil inlet of the other group of cavities is connected to the clean oil tank, and the oil outlet is connected to the gearbox. It should be noted that the two cavities do not interfere with each other. One cavity can guide the contaminated oil in the gearbox into the transfer tank, and the other cavity can guide the oil in the clean oil tank into the gearbox.

[0041] With reference to Figure 3The middle position of the supporting leg 101 is provided with a mounting circular hole for mounting the end cover 102. The bottom ends and the middle position of the top of the supporting leg 101 are provided with positioning holes. The positioning holes at the bottom ends are used for limiting the controller body, and the positioning hole at the middle position of the top is used for limiting the end cover 102 through the screw 106. The two groups of supporting legs can be mounted at the two ends of the controller body, and can be used for supporting and fixing the controller body and the end cover.

[0042] With reference to Figure 5 The inside of the end cover 102 is provided with an oil channel groove 1023. One end of the oil channel groove 1023 is connected with the oil inlet joint 111, and the other end is matched with the piston rod 1142. The inside of the end cover 102 is provided with at least one group of oil passing holes 1024. The oil channel groove 1023 can be communicated with the corresponding cavity through the oil passing holes 1024. It should be noted that the number of the oil passing holes 1024 can be one group, two groups or three groups, etc. according to the needs of the operator. The more the oil passing holes are set, the more beneficial to the discharge of the oil.

[0043] When in use, the oil enters the piston rod 1142 from the oil inlet joint 111, then flows out to the oil channel groove 1023 from the adjusting hole on the piston rod 1142, and then enters the cavity through the oil passing hole 1024. The piston rod 1142 is in clearance fit in the oil channel groove 1023, that is, there is a small gap between the outer diameter of the piston rod and the inner diameter of the oil channel groove, which is about 0.01-0.02 mm. The gap here will generate an oil film on the liquid equalizing groove 1145 outside the piston rod. Therefore, multiple oil films are formed outside the waist-shaped hole, which seals the gap and prevents the oil from flowing out between the piston rod and the oil channel groove.

[0044] With reference to Figure 4 The outside end of the end cover 102 is provided with a wrench groove 1022 and a positioning groove 1021 for connecting with the supporting leg 101. The wrench groove 1022 is convenient for the installation, disassembly and the like of the end cover 102 in the later period.

[0045] With reference to Figure 7 The piston assembly 114 is installed at the middle position of the cylinder assembly 109 and can move in the cylinder assembly 109. The piston assembly 114 and the cylinder assembly 109 are in clearance fit, and the clearance therebetween is small. The piston assembly 114 includes a piston 1141 and a piston rod 1142 transversely fixed on the piston. The middle position of the piston rod 1142 is provided with a shaft shoulder 1143 for limiting the piston 1141.

[0046] Further, with reference to Figure 9The outer circumferential surface of the two ends of the piston rod 1142 is provided with a waist-shaped hole 1144 and a liquid equalizing groove 1145. It should be noted that the waist-shaped hole 1144 can also be a rectangular hole or a rhombic hole, and the specific selection is subject to the selection of the operator. The liquid equalizing groove 1145 is provided on the outer surface of the piston rod 1142 on both sides of the waist-shaped hole 1144. The liquid equalizing groove 1145 is a groove provided on the outer surface of the piston rod 1142. The two sides of the waist-shaped hole 1144 are provided with a plurality of liquid equalizing grooves 1145. When the oil flows out of the waist-shaped hole 1144 into the oil channel groove 1023, the plurality of liquid equalizing grooves 1145 can form a plurality of oil films between the piston rod and the oil channel groove at this time, which can prevent the oil from exuding, so that the oil is only discharged from the oil passing hole 1024 to the cavity.

[0047] With reference to Figure 2 and Figure 9 The variable throttling mechanism is formed between the end cover and the piston rod in the same cavity, and the oil pressure balance is achieved through the two variable throttling mechanisms. Specifically, the two ends of the piston rod 1142 are in clearance fit with the oil channel groove 1023 in the end cover 102, and the waist-shaped holes 1144 at the two ends of the piston rod 1142 correspond to the oil passing holes 1024. It should be noted that a cavity is provided in the middle of the two ends of the piston rod 1142, and the position of the cavity is beyond the position of the waist-shaped hole 1144, so that the oil can enter from the cavity and then flow out from the waist-shaped hole. When in use, the oil flows out of the waist-shaped hole 1144 and enters between the oil channel groove 1023 and the piston rod, and then flows into the cavity from the oil passing hole 1024.

[0048] Taking the left waist-shaped hole as an example, when the left waist-shaped hole and the right waist-shaped hole move to the right at the same time, the left waist-shaped hole is staggered with the left oil channel groove 1023, and the through hole between them becomes smaller, so that the oil flowing out of the left waist-shaped hole also becomes less at this time, thereby achieving the throttling effect. At this time, the oil pressure of the left cavity becomes smaller, and correspondingly, when the right waist-shaped hole moves to the right, the through hole between the right waist-shaped hole and the right oil channel groove becomes larger, so that the oil flowing out of the right waist-shaped hole also becomes larger at this time, thereby achieving the oil pressure balance between the two cavities, and further achieving the synchronization of the output oil quantity of the two cavities.

[0049] The present application controls the oil quantity at the oil outlet by adjusting the oil outlet quantity of the two sets of throttling connectors, thereby ensuring that the oil outlet quantities of the two cavities remain balanced. Meanwhile, throttling structures are arranged in the two cavities, i.e. the throttling structures formed between the two end covers and the connected piston rods, and the throttling channels formed between the waist-shaped holes, the oil channel grooves and the oil passing holes on the piston rod. The position of the piston rod is adjusted to adjust the oil outlet quantities of the two throttling channels, thereby controlling the discharged oil quantity and further achieving the throttling effect, and further ensuring that the oil outlet quantities of the two cavities remain balanced in cooperation with the two throttling connectors.

[0050] With reference toFigure 8 The piston 1141 has a ring-shaped structure with concave sides that abut against the spring. A ring groove 1 is formed in the middle of the outer surface of the piston 1141, and a sealing ring 105 is fitted on the ring groove 1. The outer contour of the sealing ring 105 contacts the outer cylinder 1091. Two sets of ring grooves 2 are formed on the outer surface of the piston 1141. The ring groove 1 is located between the two sets of ring grooves 2. A support ring 104 is fitted on the ring groove 2, and the outer contour of the support ring 104 contacts the outer cylinder 1091.

[0051] Reference Figure 10 The cylinder assembly 109 includes an outer cylinder 1091. Two sets of oil outlets 1092 are symmetrically opened on the outer arc surface of the outer cylinder 1091, and the two sets of oil outlets 1092 are respectively connected to two cavities. A throttling connector 108 is installed on each of the two sets of oil outlets 1092. A hollow knife groove 1093 connected to the end cover 102 is opened on the inner arc surface of the outer cylinder 1091.

[0052] This application can meet the multi-step oil replacement requirements during factory testing of gearboxes, torque converters, and hydraulic couplings, thereby improving the cleanliness of the tested components. The specific operating principle is as follows:

[0053] First, install this controller. The operator can... Figure 2 The left-hand oil inlet connector 111 is connected to the gearbox under test, and the right-hand oil inlet connector is connected to the clean oil tank; then the left-hand throttle connector 108 is connected to the transfer oil tank, and the right-hand throttle connector is connected to the gearbox under test (refer to the left-right direction here). Figure 2 (in the direction of the middle); then the impurity oil in the test gearbox can enter the transfer oil tank through the controller; the clean oil in the cleaning oil tank can enter the test gearbox through the controller (it should be noted that since the controller body is symmetrically distributed, the specific installation direction depends on the operator's needs, but the test gearbox and the exhaust oil tank must be connected through one cavity, and the test gearbox and the cleaning oil tank must be connected through another cavity).

[0054] When working normally, the oil inlet pressure at both ends of the controller body is equal, the flow rate on the left and right sides is equal, the piston assembly 114 is in the middle position, the pre-compression of the coil springs 103 on both sides is equal, the force on the piston is equal in magnitude and opposite in direction, and the minimum flow cross-sectional area of ​​the oil passage formed between the symmetrical waist-shaped holes 1144 on the left and right sides of the piston rod and the oil passage groove 1023 in the end cover 102 is equal, so the throttling effect on the oil entering the controller body on the left and right sides is also equal.

[0055] At this time, the oil discharged from the test gearbox passes through the throttle joint 108 at the left end, the left end cover 102, the left inner cavity of the piston rod 1141, the oil channel groove 1023, the oil passage hole 1024, and then enters the left cavity, and finally flows out to the transfer tank through the oil outlet throttle joint 108 at the left end of the test gearbox.

[0056] At the same time, the oil extracted from the cleaning tank also passes through the right oil inlet joint 111, the right end cover 102, the left inner cavity of the piston rod 1141, the oil channel groove 1023, the oil passage hole 1024, and then enters the right cavity, and finally is injected into the test gearbox through the right oil outlet throttle joint 108; at this time, the input and output flow rates of the controller body on the left and right sides are equal.

[0057] When the oil pressure discharged from the test gearbox fluctuates and rises, the oil pressure entering the left end of the controller body rises, and the pressure difference between the left cavity increases, the oil flow into the left cavity increases, the throttling and pressurization of the left oil outlet throttle joint 108 increases, the force of the oil on the left end of the piston rod 1142 increases, the internal oil pressure of the left cavity increases, and the piston assembly 114 is pushed to the right, the force of the left spiral spring 103 on the piston 1141 decreases, and the force of the right spiral spring 103 on the piston 1141 increases.

[0058] With the right movement of the piston assembly 114, the waist-shaped hole 1144 at the left end of the piston assembly 114 also moves right, at this time, the minimum flow area of the oil passage formed between the left end waist-shaped hole and the oil channel groove 1023 on the left end cover 102 decreases, the throttling effect increases, the oil flow into the left cavity decreases, and the oil flow out of the left oil outlet throttle joint 108 further decreases, at this time, the throttling effect of the left oil outlet throttle joint 108 decreases, and the internal oil pressure of the left cavity decreases.

[0059] At the same time, with the right movement of the piston assembly 114, the compression amount of the right spiral spring 103 increases, the minimum flow area of the oil passage formed between the waist-shaped hole at the right end of the piston rod 1142 and the oil channel groove 1023 on the right end cover 102 increases, the oil flow into the right cavity increases, the throttling and pressurization effect of the right throttle joint 108 increases, the internal oil pressure of the right cavity increases, and the oil pressure drives the piston assembly 114 to move left to return to the original position, until the pressures in the left and right cavities are equal.

[0060] Under the action of the spiral spring on the right side of the piston rod and the oil pressure, the force of the left spiral spring and the oil pressure on the piston rod assembly is overcome, so that the piston continues to return to the original position, until the input and output flow rates on both sides are equal.

[0061] Similarly, when the oil pressure of the test gearbox fluctuates and decreases, the piston rod assembly 114 automatically returns to the middle position under the action of the two side spiral springs and the oil pressure, and when the balance state is reached, the input and output flow rates on the left and right sides of the automatic synchronous controller body are automatically kept equal.

[0062] Although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0063] Therefore, the above only describes the preferred embodiments of the present application, and is not intended to limit the scope of the present application; that is, various equivalent transformations made within the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A pressure negative feedback type flow synchronization controller, comprising a barrel assembly (109) and end covers (102) mounted at both ends of the barrel assembly, and a supporting leg (101) mounted on the outer side of each end cover, characterized in that: The cylinder assembly (109) is provided with an oil chamber (113) and a piston assembly (114) transversely arranged in the oil chamber; The piston assembly (114) divides the oil chamber (113) into two symmetrical cavities, and springs are arranged in the two cavities and sleeved on the piston rod (1142) in the piston assembly; a variable throttling mechanism is formed between the end cover and the piston rod in the same cavity, and the outlets of the two cavities are provided with two throttling joints (108) with the same throttling aperture, and the two cavities realize equal oil pressure through the two variable throttling mechanisms; One of the two cavities is used for leading out the contaminated oil in the test gearbox, and the other cavity is used for leading in clean oil into the test gearbox; the inside of the end cover (102) is provided with an oil channel groove (1023), one end of the oil channel groove (1023) is connected with the oil inlet joint (111), the other end is matched with the piston assembly (114), at least one group of oil passing holes (1024) are arranged on the inner side of the end cover (102), and the oil channel groove (1023) is communicated with the corresponding cavity through the oil passing holes (1024); the outer circumferential surface of the two ends of the piston rod (1142) is provided with a waist-shaped hole (1144) and a liquid equalizing groove (1145), and the liquid equalizing groove (1145) is arranged on the outer surface of the piston rod (1142) on the two sides of the waist-shaped hole (1144); The two ends of the piston rod (1142) are gap-fitted with the oil channel groove (1023) in the end cover (102); The piston rod (1142) is transversely fixed on the piston (1141) in the piston assembly (114), and the middle position of the piston rod (1142) is provided with an axial shoulder (1143) for limiting the piston (1141); The piston (1141) has a circular ring structure, the two side surfaces are concave, and the piston (1141) is in abutment with the springs; a circular ring groove one is arranged on the middle part of the outer circumferential surface of the piston (1141), and a sealing ring (105) is sleeved on the circular ring groove one; The outer circumferential surface of the piston (1141) is provided with two groups of circular ring grooves two, and the circular ring groove one is located between the two groups of circular ring grooves two; a supporting ring (104) is sleeved on the circular ring groove two; The cylinder assembly (109) comprises an outer cylinder (1091), and two groups of oil outlets (1092) are symmetrically arranged on the outer arc surface of the outer cylinder (1091) and deviated from the two ends; Two throttling joints (108) are arranged on the two groups of oil outlets (1092), and a hollow groove (1093) connected with the end cover (102) is arranged on the inner arc surface of the outer cylinder (1091).

2. The pressure negative feedback type flow synchronization controller according to claim 1, characterized by: A wrench groove (1022) and a positioning groove (1021) used for connecting with the supporting leg (101) are arranged on the outer side end of the end cover (102).

3. The pressure negative feedback type flow synchronization controller according to claim 1, characterized by: The spring is a helical spring (103).

4. The pressure negative feedback type flow synchronization controller according to claim 1, characterized by: A mounting circular hole used for mounting the end cover (102) is arranged at the middle position of the supporting leg (101), positioning holes are arranged at the bottom ends and the middle part of the top of the supporting leg (101), and the positioning hole at the middle part of the top is used for limiting the end cover (102) through a screw (106).

5. Use of a pressure negative feedback flow synchronizer according to any one of claims 1 to 4, characterized in that: The pressure negative feedback type flow synchronous controller is used for oil replacement during gearbox test.

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