阅读说明：本技术 一种板式连接的优先型转向流量放大阀 (Priority type steering flow amplifying valve connected in plate mode ) 是由 蔡国定 张平平 何关清 金鑫 于 2019-08-26 设计创作，主要内容包括：本发明公开了一种板式连接的优先型转向流量放大阀,包括通过螺栓固接于液压转向器的阀体,阀体与液压转向器相连的部分包括进油口、回油口、左转向油缸接口油口、右转向油缸接口油口以及可向其它液压工作系统供油的EF油口,该阀体内部设置有优先阀、单向阀和对应左右转向的转向流量放大阀,优先阀设置于进油口和流量放大阀之间,液压油通过优先阀进入对应转向的其中一个流量放大阀,系统主油路供给的油液通过优先阀组放大供油量且输出于相应的负载油路；采用本技术方案,具有集成化程度高,结构紧凑,功能齐全,占有空间小,系统布局简易,节约成本明显等显著特性优势。(The invention discloses a plate-connected priority steering flow amplifying valve, which comprises a valve body fixedly connected to a hydraulic steering gear through bolts, wherein the part of the valve body connected with the hydraulic steering gear comprises an oil inlet, an oil return port, a left steering oil cylinder interface oil port, a right steering oil cylinder interface oil port and an EF oil port capable of supplying oil to other hydraulic working systems; by adopting the technical scheme, the integrated solar water heater has the remarkable characteristic advantages of high integration degree, compact structure, complete functions, small occupied space, simple system layout, obvious cost saving and the like.)

1. The utility model provides a priority type of plate-type connection turns to flow amplification valve, includes the valve body that passes through the bolt rigid coupling in hydraulic steering ware which characterized in that: the valve body and the part that the hydraulic steering gear links to each other is provided with a plurality of hydraulic fluid ports that are used for the hydraulic pressure butt joint, and wherein the hydraulic fluid port that links to each other includes oil inlet, oil return opening, left steering cylinder interface hydraulic fluid port, right steering cylinder interface hydraulic fluid port and can be to the EF hydraulic fluid port of other hydraulic pressure operating system fuel supplies, and this valve body is inside to be provided with the hydraulic pressure valves that are used for the flow to enlarge, and the fluid that the system main oil way supplied with enlargies the fuel delivery and exports in corresponding load oil circuit.

2. A plate-connected preferential steering flow amplifying valve according to claim 1, a priority valve, a one-way valve and a steering flow amplifying valve corresponding to left and right steering are integrated in the hydraulic valve group, the priority valve is arranged between the oil inlet and the flow amplifying valve, hydraulic oil enters one of the flow amplifying valves corresponding to the steering through the priority valve, wherein, the one-way valve is arranged between the oil inlet of the valve body and the oil inlet of the priority valve, a first spring for controlling the closing state of the blocking cover when the blocking cover is not hydraulic is arranged in the one-way valve, one end of the priority valve is fixedly connected with the inner side wall of the valve body, and a block and a second spring for controlling the oil flow passing through corresponding steering are arranged in the priority valve, the spring deformation control block seals the non-steering hydraulic oil way by controlling the oil quantity, so that hydraulic oil preferentially enters the steering flow amplifying valve in the steering oil way.

3. A plate-connected preferential steering flow amplifying valve according to claim 2, wherein said steering flow amplifying valve is cylindrical and is provided with a plurality of through holes for oil supply path rotation on a cylindrical surface, said valve body is provided with corresponding oil grooves and wall walls between oil groove spaces in an inner wall surrounding the steering flow amplifying valve, both ends of the steering flow amplifying valve are provided with third springs for buffering and fixing to control the axial movement of the priority valve by the entry and exit of hydraulic oil from the plurality of through holes, and the hydraulic oil of the priority valve at the corresponding position preferentially enters the corresponding steering flow amplifying valve through the through hole connected to the oil groove, and the output end of the flow amplifying valve is connected to said hydraulic steering gear.

4. The plate-type connected preferential steering flow amplifying valve according to claim 2, wherein the check valve is disposed in an oil inlet of the valve body connected to the hydraulic steering gear, and a left steering cylinder port oil port and a right steering cylinder port oil port of the valve body are correspondingly connected to a steering port of the hydraulic steering gear, so as to control oil quantity in the valve body by corresponding steering output from the hydraulic steering gear, and output corresponding oil quantity in the hydraulic steering generator by the corresponding steering flow amplifying valve.

5. A method of using a priority type steering flow amplifying valve comprising a plate-type connected priority type steering flow amplifying valve according to any one of claims 1 to 4, comprising the steps of:

s1, butting and installing oil ports between the valve body and the hydraulic steering gear to ensure that the oil inlet, the oil return port, the left steering oil cylinder interface oil port and the right steering oil cylinder interface oil port are correctly connected;

s2, when the system load changes (and) the rotating speed of the steering wheel changes, when oil supplied by an oil pump of a main oil path of the steering system passes through a priority valve, the flow required by the hydraulic steering gear is preferentially ensured;

s3, when the steering wheel rotates left, the small flow of the left-turning flow inlet of the hydraulic steering gear is used as the hydraulic proportion to control the valve core of the left-turning flow amplification valve to move, so that the flow amplification valve enters the left-turning oil cylinder at a larger certain proportion of flow;

on the contrary, the small flow at the right steering flow inlet of the hydraulic steering gear is used as a hydraulic proportional control valve core of the right steering flow amplifying valve to move for 2-4, so that the flow amplifying valve enters the right steering oil cylinder at a relatively large flow with a certain proportion.

6. The method as claimed in claim 5, wherein the step S3 is implemented by generating a relative angular displacement between the spool and the valve sleeve of the hydraulic steering gear when the steering wheel is turned, generating a pressure drop across the variable orifice of the spool and the valve sleeve of the hydraulic steering gear, transmitting the pressure at both ends to both ends of the spool of the priority valve on the corresponding flow amplifying valve, forcing the spool of the priority valve to find a new equilibrium position, and allowing the oil to enter the steering gear oil supply port of the priority valve through the priority valve oil inlet chamber of the flow amplifying valve, wherein only a larger flow rate can generate a pressure difference before the rotation speed change at both ends, so as to push the spool of the priority valve on the flow amplifying valve to move and the steering gear oil supply port is enlarged.

Technical Field

The invention belongs to the field of steering hydraulic control, and particularly relates to a plate-connected priority steering flow amplifying valve.

Background

The complexity of a hydraulic system of the prior large-scale loader, mining truck, tractor and other vehicles is determined by different purposes and complex working conditions. The common hydraulic steering hydraulic systems mainly comprise two types:

the hydraulic steering system is a load sensing hydraulic steering system which consists of a variable pump, a steering oil cylinder, a coaxial flow amplifying steering gear, a priority valve and the like. Because of large system flow, high system pressure and poor stability of a variable steering system, the requirement on a steering gear is high, generally, a high-pressure-resistant wide-corner hydraulic steering gear with an oil cylinder damping function (patent numbers: ZL00247499.9 and ZL00247500.6) needs to be selected, and the current standard depends on foreign brands. The system has the advantages of simple structure, low cost and the like, but the system has large pressure loss, serious system heating and complex pipeline layout in the working process. The maximum displacement of the coaxial flow amplification steering gear is only 1000mL/r, and the steering system of a vehicle with a steering flow needing to be larger cannot be met.

And the second flow amplifying hydraulic steering system consists of variable pump, closed core non-reactive hydraulic steering gear, left limiting valve, right limiting valve, flow amplifying valve, pressure reducing valve, steering oil cylinder, etc. The main principle is that the small-flow pilot oil output by an L (or R) oil port of the steering gear controls the valve core of the flow amplifying valve to move, so that the flow amplifying valve enters a steering oil cylinder at a larger flow rate, and the flow amplifying steering function is realized. The hydraulic steering device has the advantages of stable operation, small hydraulic impact, large steering flow and the like. But has the defects of more system components, pipeline connection layout load, high cost and the like. Meanwhile, the steering oil cylinder has the functional defects of no steering end point feeling, no overload protection of the steering oil cylinder, self-walking of the steering oil cylinder caused by unequal pilot oil pressure differences and the like.

Disclosure of Invention

The invention aims to solve the technical problem of providing a plate-connected priority type steering flow amplifying valve.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a priority type of plate-type connection turns to flow amplification valve, includes the valve body through bolt rigid coupling in hydraulic steering gear, the valve body with the part that hydraulic steering gear links to each other is provided with a plurality of hydraulic fluid ports that are used for the hydraulic pressure butt joint, and the hydraulic fluid port that wherein links to each other includes oil inlet, oil return opening, left turn to hydro-cylinder interface hydraulic fluid port, right turn to hydro-cylinder interface hydraulic fluid port and can be to the EF hydraulic fluid port of other hydraulic work system fuel supplies, and the inside hydraulic valve group that is used for the flow to enlarge of being provided with of this valve body, the fluid that the main oil circuit of system supplied with amplifies the.

The invention discloses a plate-connected priority steering flow amplifying valve, wherein a priority valve, a one-way valve and a steering flow amplifying valve corresponding to left and right steering are integrated in a hydraulic valve group, the priority valve is arranged between an oil inlet and the flow amplifying valve, hydraulic oil enters one of the flow amplifying valves corresponding to the steering through the priority valve, wherein, the one-way valve is arranged between the oil inlet of the valve body and the oil inlet of the priority valve, a first spring for controlling the closing state of the blocking cover when the blocking cover is not hydraulic is arranged in the one-way valve, one end of the priority valve is fixedly connected with the inner side wall of the valve body, and a block and a second spring for controlling the oil flow passing through corresponding steering are arranged in the priority valve, the spring deformation control block seals the non-steering hydraulic oil way by controlling the oil quantity, so that hydraulic oil preferentially enters the steering flow amplifying valve in the steering oil way.

The invention discloses a plate-connected priority steering flow amplifying valve, which is cylindrical, a plurality of through holes for oil supply path rotation are arranged on a cylindrical surface, corresponding oil grooves and hole walls between the oil grooves are arranged in the inner wall of a valve body surrounding the steering flow amplifying valve, third springs for buffering and fixing are arranged at two ends of the steering flow amplifying valve so as to control the axial movement of the priority valve through the entry and exit of hydraulic oil from the through holes, the hydraulic oil at the corresponding position of the priority valve preferentially enters the corresponding steering flow amplifying valve through the through hole connected with the oil grooves, and the output end of the flow amplifying valve is connected with a hydraulic steering gear.

The invention discloses a plate-connected preferential steering flow amplifying valve, wherein a check valve is arranged in an oil inlet connected with a hydraulic steering gear, a left steering oil cylinder interface oil port and a right steering oil cylinder interface oil port of the valve body are correspondingly connected with a steering oil port interface of the hydraulic steering gear, so that the oil quantity is controlled in the valve body through corresponding steering output by the hydraulic steering gear, and the corresponding oil supply quantity is output in a hydraulic steering generator through the corresponding steering flow amplifying valve.

The invention discloses a use method of a priority type steering flow amplification valve, which comprises the following steps:

s1, butting and installing oil ports between the valve body and the hydraulic steering gear to ensure that the oil inlet, the oil return port, the left steering oil cylinder interface oil port and the right steering oil cylinder interface oil port are correctly connected;

s2, when the system load changes (and) the rotating speed of the steering wheel changes, when oil supplied by an oil pump of a main oil path of the steering system passes through a priority valve, the flow required by the hydraulic steering gear is preferentially ensured;

s3, when the steering wheel rotates left, the small flow of the left-turning flow inlet of the hydraulic steering gear is used as the hydraulic proportion to control the valve core of the left-turning flow amplification valve to move, so that the flow amplification valve enters the left-turning oil cylinder at a larger certain proportion of flow;

on the contrary, the small flow at the right steering flow inlet of the hydraulic steering gear is used as a hydraulic proportional control valve core of the right steering flow amplifying valve to move for 2-4, so that the flow amplifying valve enters the right steering oil cylinder at a relatively large flow with a certain proportion.

The invention discloses a use method of a priority steering flow amplification valve, wherein in the step S3, when a steering wheel steers, relative angular displacement is generated between a valve core and a valve sleeve of a hydraulic steering gear, pressure drop is generated on two sides of a variable orifice on the valve core and the valve sleeve of the hydraulic steering gear, the pressure on the two ends is transmitted to the two ends of a valve core of a priority valve on the corresponding flow amplification valve, the valve core of the priority valve is forced to find a new balance position, oil enters an oil supply port of the steering gear of the priority valve through an oil inlet cavity of the priority valve on the flow amplification valve, and at the moment, pressure difference before rotation speed change can be generated on the two ends only when larger flow flows, so that the valve core of the priority valve on the flow amplification valve is pushed to move, and.

By adopting the technical scheme, when the travel of the steering oil cylinder reaches the end, the pressure of the steering system rises, and the safety valve of the steering gear is opened to protect the steering element. At the moment, because the steering gear has an obvious end point feeling function, an additional left and right limiting valve group is not needed; the matched hydraulic steering gear adopts a load sensing type hydraulic steering gear, integrates a safety valve for protecting a steering system, an overload valve for protecting a steering oil cylinder, an oil supplementing valve for preventing cavitation corrosion, an oil supplementing valve for preventing steering wheel shake caused by oil backflow and other integrated functional hydraulic valves, and has the remarkable characteristic advantages of high integration degree, compact structure, complete functions, small occupied space, simple system layout, obvious cost saving and the like; the hydraulic proportional control flow amplification design principle is adopted for oil at the left and right steering oil ports of the matched steering gear, and the hydraulic proportional control flow amplification system has the advantages that the flow amplification basically presents linear characteristics, the amplification ratio is stable, the influence by the flow and load change is small, the steering is stable and easy to control, the hydraulic impact is small in the instant of reversing and starting and stopping, the system noise is low, and the like. Compared with the pilot control principle adopted by the common flow amplifying valve in the current market, the hydraulic proportional control principle does not need a pressure reducing valve to reduce the pressure of the control oil.

The invention will be explained in more detail below with reference to the drawings and examples.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

FIG. 1: the outline connection diagram of the flow amplifying valve;

FIG. 2: a structural cross-sectional view of the flow amplifying valve (neutral state);

FIG. 3: the flow amplifying valve amplifies the valve component structure section view (the middle position state);

FIG. 4: a structural cross-sectional view of the flow amplifying valve (right diverter state);

FIG. 5: hydraulic schematic of flow amplifying valve and hydraulic steering gear (neutral state).

Labeled as: fig. 1 and 5: the hydraulic control system comprises an oil inlet, an oil return port HT, a left steering oil cylinder oil receiving port CL, a right steering oil cylinder oil receiving port CR, an oil supply port EF of other working systems, a steering gear oil supply port CF, a left hydraulic control oil port L, a right hydraulic control oil port R, a steering gear oil return port T and a load sensing signal oil port LS.

Fig. 2 and 4: the steering valve comprises a valve body 1, a left steering flow amplifying valve 2L, a right steering flow amplifying valve 2R, a one-way valve 3, a priority valve 4, a left steering hydraulic control oil cavity 1-1L, a right steering hydraulic control oil cavity 1-1R, a left amplifying oil cavity 1-2CL, a right amplifying oil cavity 1-2CR, an amplifying valve oil inlet cavity 1-3, an amplifying valve oil tank oil return cavity 1-4, a priority valve CF oil cavity 1-5, a steering gear oil supply port 1-6, a priority valve oil inlet cavity 1-7, a priority valve EF oil cavity 1-8, a load sensing LS signal control oil cavity 1-9, a priority valve core 4-1 and a priority valve control spring 4-2.

FIG. 3: the hydraulic control valve comprises a valve body 1, a plug 2-1, a hydraulic control spring 2-2, a proportion adjusting block 2-3, a proportion adjusting hole 2-31, an amplification valve core 2-4, a hydraulic control hole 2-41, an amplification valve steering oil outlet hole group 2-42, a damping hole group 2-43, an amplification valve steering oil return hole group 2-44, an amplification oil inlet hole group 2-45, an amplification valve oil tank oil return hole group 2-46, a middle position control spring 2-5 and a middle position stop block 2-6.

Detailed Description

The following description of the embodiments of the present invention, with reference to the accompanying drawings, will be made in further detail for the purpose of providing a more complete, accurate and thorough understanding of the inventive concepts and technical solutions of the present invention, including the shapes of the components, the structures, the mutual positions and connection relationships of the components, the functions and operating principles of the components, the manufacturing processes, the operation and use methods, and the like.

Fig. 1 is an external connection diagram of a flow amplifying valve according to the present invention, and a plate-type connected priority type steering flow amplifying valve as shown in the drawing includes a valve body fixedly connected to a hydraulic steering gear through bolts, a portion of the valve body connected to the hydraulic steering gear is provided with a plurality of oil ports for hydraulic docking, wherein the connected oil ports include an oil inlet, an oil return port, a left steering cylinder interface oil port, a right steering cylinder interface oil port, and an EF oil port capable of supplying oil to other hydraulic working systems, a hydraulic valve group for flow amplification is provided inside the valve body, and oil supplied from a main oil line of the system amplifies the oil supply amount through the priority valve group and outputs the oil supply amount to a corresponding load oil line; and the oil ports P, L, R, T and LS on the matched hydraulic steering gear II are communicated in sequence. The complex problems of system layout and the like caused by pipeline connection are greatly reduced, and meanwhile, the element installation space of the host is greatly saved.

The hydraulic valve group is internally and integrally provided with a priority valve, a one-way valve and a steering flow amplifying valve corresponding to left and right steering, the priority valve is arranged between an oil inlet and the flow amplifying valve, hydraulic oil enters one of the flow amplifying valves corresponding to the steering through the priority valve, the one-way valve is arranged between the oil inlet of the valve body and an oil inlet of the priority valve, a first spring for controlling a closing state of a blocking cover of the one-way valve when the blocking cover is in a non-hydraulic state is arranged in the one-way valve, one end of the priority valve is fixedly connected to the inner side wall of the valve body, and a blocking block and a second spring for controlling the oil flow passing through corresponding to the steering are arranged in the priority valve, so that the spring deformation control blocking block seals a non-steering hydraulic oil path through controlling the oil.

Fig. 2 is a structural sectional view of a flow amplifying valve of the present invention, fig. 5 is a hydraulic schematic diagram of the present invention, and as shown in the drawings, a left steering flow amplifying valve 2L and a right steering flow amplifying valve 2R are independent, and the hydraulic proportional control flow amplifying design principle is adopted for oil passing through ports of the steering gear L and R. The flow amplification device has the advantages of basically presenting linear characteristic, stable amplification ratio, small influence by flow and load change, stable steering, easy control, small hydraulic impact in the moment of reversing and starting and stopping, low system noise and the like. Compared with the pilot control principle adopted by the common flow amplifying valve in the current market, the hydraulic proportional control principle does not need a pressure reducing valve to reduce the pressure of the control oil.

Turn to flow amplification valve and be cylindrical and be provided with the through-hole that a plurality of fuel feeding way rotated on the face of cylinder, the valve body is equipped with corresponding oil groove and oil groove interval between the pore wall in the inner wall that surrounds to turn to flow amplification valve, and the both ends that turn to flow amplification valve are provided with and are used for buffering and fixed third spring to through the business turn over control priority valve axial displacement in hydraulic oil from a plurality of through-holes, and the priority valve is at the hydraulic oil of relevant position department through the through-hole that meets with the oil groove priority entering corresponding flow amplification valve that turns to, and the output of flow amplification valve with hydraulic steering gear links to each other.

The check valve is arranged in an oil inlet of the valve body connected with the hydraulic steering gear, and a left steering oil cylinder interface oil port and a right steering oil cylinder interface oil port of the valve body are correspondingly connected with a steering oil port interface of the hydraulic steering gear so as to control oil quantity in the valve body through corresponding steering output by the hydraulic steering gear and output corresponding oil supply quantity in the hydraulic steering generator through a corresponding steering flow amplifying valve.

Fig. 5 is a hydraulic schematic diagram (neutral state) of the flow amplifying valve and the hydraulic steering gear of the present invention, and the ratio of the hydraulic control flow of the hydraulic steering gear ii to the amplifying flow of the flow amplifying valve i can be up to 1: 8. Displacement of the hydraulic steering gear: 80mL/r, 100mL/r, 125mL/r, 160mL/r, 200mL/r, 250mL/r, can be selected by the user according to the system requirements. Therefore, the maximum displacement of a hydraulic steering assembly consisting of the hydraulic steering gear II and the flow amplifying valve I can reach 8 multiplied by 250mL/r which is 2000mL/r, and basically can meet the requirements in the field of hydraulic steering gear systems of vehicles such as medium and large-sized loaders, mining automobiles, tractors and the like, the flow amplifying valve I adopts a load sensing technology, a priority valve 4 is integrated in the flow amplifying valve I, and a matched hydraulic steering gear adopts a load sensing type hydraulic steering gear. The load sensing hydraulic component comprises: the change of the steering load has good pressure compensation; the flow and the pressure of the steering loop are kept preferential, and the steering performance is reliable; the steering loop and other working loops are not affected with each other, so that the system efficiency is improved; high steering sensitivity, quick response, good starting characteristic under cold conditions and the like.

Fig. 2 is a structural sectional view (neutral position state) of a flow amplifying valve, fig. 3 is a structural sectional view (neutral position state) of an amplifying valve assembly of the flow amplifying valve, and as shown in fig. 1, fig. 2 and fig. 3, a flow amplifying hydraulic steering system is composed of hydraulic components such as a hydraulic pump, left and right steering cylinders, a plate-type connected preferential steering flow amplifying valve i of the invention and a matched load sensing hydraulic steering gear ii. When an oil pump starts to supply oil, oil enters the oil inlet cavity 1-7 of the priority valve of the flow amplifying valve I through an HP port, the oil does not enter the CF oil cavity 1-5 of the priority valve on the flow amplifying valve I due to the fact that the hydraulic steering gear II and the flow amplifying valve I are in the middle position state, the oil overcomes the spring force of the CF valve 4-2 of the priority valve, the valve core 4-1 of the priority valve moves towards one side of the spring, and the oil enters the EF oil cavity 1-8 of the priority valve and enters other working systems through the oil ports EF.

FIG. 4 is a structural cross-sectional view (right steering state) of the flow amplifying valve of the present invention, FIG. 5 is a hydraulic schematic diagram (middle state) of the flow amplifying valve and the hydraulic steering gear of the present invention, as shown in FIG. 4 and FIG. 5, with the right rotation of the steering wheel (taking right rotation as an example), the hydraulic control oil outputted by the load sensing type hydraulic steering gear II passes through the opposite R port on the valve body 1 of the priority type steering flow amplifying valve I through the R oil port, reaches the right steering hydraulic control oil chamber 1-1R inside the right steering flow amplifying valve 2R of the valve body 1, the oil passes through the proportional control hole 2-31 on the proportional control block 2-3, reaches the hydraulic control hole 2-41 on the valve core 2-4 of the amplifying valve, and then through the smaller damping hole on the damping hole group 2-43, the hydraulic control oil generates pressure drop, and the pressure drop is transmitted to both ends of the amplifying valve core 2-4, the pressure of the end of the hydraulic control spring 2-2 is greater than that of the end of the middle control spring 2-5, the valve core 2-4 moves towards the end of the middle control spring 2-5, the amplified oil inlet hole group 2-45 is the same as that of the amplification valve oil inlet cavity 1-3, at the moment, oil in the priority valve CF oil cavity 1-5 inside the priority valve 2 overcomes the opening pressure of the one-way valve 5 and enters the amplification valve oil inlet cavity 1-3, the amplified oil reaches the amplification valve steering oil outlet hole group 2-42 through the amplified oil inlet hole group 2-45 and then enters the right amplification oil cavity 1-2CR and reaches the steering oil cylinder through the oil receiving hole CR of the right steering oil cylinder, and the right steering of the vehicle is realized. The size of the amplified oil liquid and the size of the hydraulic control oil liquid are in a linear proportional relation (8:1, namely 8 times of amplification), so that the higher the rotating speed of the steering wheel is, the larger the output amplified steering flow is.

Meanwhile, the steering amplification return oil of the steering oil cylinder reaches a left amplification oil cavity 1-2CL inside the left steering flow amplification valve 2L through the left steering oil cylinder oil receiving port CL and passes through a larger damping hole and a smaller damping hole of a damping hole group 2-43 on a valve core 2-4 of the amplification valve. Because the pressure drop of the steering amplification return oil passing through the larger damping hole is smaller than that of the steering amplification return oil passing through the smaller damping hole, the pressure of the end of the hydraulic control spring 2-2 is smaller than that of the end of the middle control spring 2-5, the hydraulic force overcomes the spring force of the hydraulic control spring 2-2, the valve core 2-4 is pushed to move towards the hydraulic control spring 2-2, the steering return oil hole group 2-44 of the amplification valve is communicated with the oil return hole group 2-46 of the oil tank of the amplification valve, and the steering amplification return oil passes through the steering return oil hole group 2-44 of the amplification valve and then reaches the oil return cavity 1-4 of the oil tank of the amplification valve through the oil. The steering amplification return oil returns to the oil tank through an oil return port HT of the oil tank to complete the right steering function. (the left steering principle is the same and will not be described).