Tractor dual power brake valve and tractor dual power brake system

Abstract

The application provides a tractor double-power brake valve and a tractor double-power brake system. The tractor double-power brake valve comprises a valve core, an oil supply port P, a control port B and an oil return port T. The valve core is connected with a foot pedal component. The foot pedal component can control the valve core to be in an initial state or a working state. One end of the control port B is in communication with the valve core, and the other end is in communication with an actuating mechanism. The oil return port T is in communication with an oil return tank, and the other end is in communication with the valve core. The application has two valve cores, that is, two actuating mechanisms can be controlled simultaneously, replacing the existing power cylinder or power booster, which is not in the form of a power cylinder, but in the form of a brake valve, so that the leakage is small even if a problem occurs. Secondly, the existing power cylinder or power booster has low pressure bearing and low generated power, which is a low-pressure control mode, so that the final output is small flow. The application has no pressure limitation and can realize high-pressure and large-flow braking.

Description

Technical Field

[0001] This application relates to the field of tractor technology, and in particular to a tractor dual-power brake valve and a tractor dual-power brake system. Background Technology

[0002] The importance of the tractor braking system is self-evident; it is one of the core guarantees for the safe operation of the tractor. Currently, the traditional tractor braking system mainly consists of simple mechanical braking system and hydraulic braking system. Among them, the simple mechanical braking system is generally suitable for low-speed, light-load tractors, which relies on mechanical components to transmit braking force. This method has a slow braking response and uneven distribution of braking force. The hydraulic braking system relies on traditional brake cylinders or boosters for hydraulic braking. This method has the following defects: (1) The brake cylinder has the problem of large oil leakage due to unreliable sealing, which leads to the failure of the braking system; (2) Due to the limitations of the structure of the brake cylinder or booster, it cannot meet the high-pressure, high-flow braking requirements.

[0003] Therefore, there is an urgent need for a dual-power brake valve and a dual-power brake system for tractors, which can, to some extent, solve the technical problems existing in the current technology. Utility Model Content

[0004] To address the above issues, this application provides a dual-power brake valve and a dual-power brake system for tractors, replacing existing brake cylinders or boosters, and meeting the requirements of high-pressure, high-flow braking systems. Furthermore, the valve's leakage and responsiveness are superior to traditional booster cylinders, resulting in higher braking system safety. In addition, the built-in two sets of valve cores allow for independent control to achieve single-sided braking and auxiliary steering functions, as well as bilateral braking. The built-in balance pipeline ensures even distribution of braking force, resulting in a superior braking experience.

[0005] This application provides a dual-power brake valve for a tractor; comprising: The valve core is provided in two parts, and both valve cores are connected to the foot pedal component; the foot pedal component can control the valve core to be in the initial state or the working state. The oil supply port P has one end connected to the oil supply end, and the other end connected to the two valve cores respectively through the oil supply pipeline; There are two control ports B. One end of each control port B is connected to the valve core through a first execution pipeline, and the other end is connected to the actuator through a second execution pipeline. The return port T has one end connected to the return oil tank, and the other end connected to the two valve cores respectively through the return oil pipeline; When the foot pedal controls the valve core to be in the initial state, the valve core, the oil supply line, and the first execution line are all in a non-conductive state, and the return line is connected to the valve core, so that the oil in the valve core flows back to the return oil tank through the return line; when the foot pedal controls the valve core to be in the working state, the valve core, the oil supply line, the first execution line, and the second execution line are all in a conductive state, so that the oil supply end can supply oil to the actuator in sequence through the oil supply port P, the valve core, the first execution line, and the second execution line, and the return line is in a non-conductive state.

[0006] In the above technical solution, the valve core further has a working reversing position and an initial reversing position in sequence along the force direction of the foot pedal component; The working reversing position has five working valve ports, namely working valve port D1, working valve port D2, working valve port D3, working valve port D4 and working valve port D5; wherein working valve port D1 is normally closed, working valve port D2 is connected to working valve port D3 through a first connecting pipe, and working valve port D4 is connected to working valve port D5 through a second connecting pipe. The initial reversing position has five working valve ports, namely working valve port D11, working valve port D12, working valve port D13, working valve port D14 and working valve port D15; wherein working valve port D11 is connected to working valve port D13 through a third connecting pipe, and working valve ports D12, D14 and D15 are all in a normally closed state. When the foot pedal component controls the valve core to be in the initial reversing position, the valve core is in the initial state. When the valve core is in the initial state, the oil supply port P corresponds to the working valve port D12; the oil return port T is connected to the working valve port D11; and the working valve port D13 is connected to the first execution pipeline, so that the oil of the actuator flows back to the oil return tank in sequence through the first execution pipeline, the working valve port D13, the third connecting pipe, and the working valve port D11. When the foot pedal component controls the valve core to be in the working reversing position, the valve core is in the working state. When the valve core is in the working state, the oil return port T corresponds to the working valve port D1. The oil supply port P is connected to the working valve port D2 through the oil supply pipeline, and the working valve port D3 is connected to the first execution pipeline, so that the oil supply end can supply oil to the actuator in sequence through the oil supply port P, the first connecting pipe, the first execution pipeline and the second execution pipeline.

[0007] In the above technical solution, the valve core further includes an auxiliary reversing position located between the working reversing position and the initial reversing position; The auxiliary position has five working valve ports, namely working valve port D6, working valve port D7, working valve port D8, working valve port D9 and working valve port D10; working valve ports D6, D7 and D8 are all normally closed, and working valve ports D9 and D10 are connected by the third connecting pipe.

[0008] In the above technical solution, the tractor dual power brake valve further includes a pressure balancing unit connected between the two valve cores, the pressure balancing unit including a first pressure balancing pipeline and a second pressure balancing pipeline. When the valve core is in the initial state, one end of the first pressure balancing pipeline corresponds to the working valve port D14, and the other end is connected to the first actuation pipeline; the two ends of the second pressure balancing pipeline correspond to the working valve port D15 respectively. When the valve core is in the working state, one end of the first pressure balancing pipeline is connected to the working valve port D4, and the other end is connected to the first execution pipeline; both ends of the second pressure balancing pipeline are respectively connected to the working valve port D15, so that the oil pressure of the two valve cores is the same.

[0009] In the above technical solution, the tractor dual-power brake valve further includes a feedback pipeline; The feedback pipeline is located between the bottom of the valve core and the first execution pipeline, and the feedback pipeline is connected to the first execution pipeline.

[0010] In the above technical solution, the tractor dual power brake valve further includes a reset component; The reset element is disposed between the bottom of the valve core and the valve seat.

[0011] In the above technical solution, the reset element is further defined as a reset spring.

[0012] This application also provides a dual-power braking system for tractors, including the aforementioned dual-power braking valve for tractors.

[0013] In the above technical solution, the foot pedal component further includes a foot pedal and a linkage component; Both ends of the linkage component are connected to the foot pedal and the top of the valve core, respectively; when the foot pedal is pressed, the linkage component can control the movement of the two valve cores. The linkage component includes a linkage rod and a connecting pin; the linkage rods are respectively disposed on the top of the valve core, and the two linkage rods on the top of the valve core are detachably connected by the connecting pin; When the two linkage rods are not connected, the foot pedal can brake the valve core on one side; when the two linkage rods are connected by the connecting pin, the foot pedal can brake the valve core on both sides.

[0014] In the above technical solution, the actuator is further defined as a brake; the control port B is connected to the brake through the second actuator pipeline, and the brake pressure can be provided to the brake through the control port B and the second actuator pipeline to achieve vehicle braking.

[0015] Compared with the prior art, this application has the following beneficial effects: This application provides a dual-power brake valve for a tractor; comprising: The valve core is provided in two parts, and both valve cores are connected to the foot pedal component; the foot pedal component can control the valve core to be in the initial state or the working state. The oil supply port P has one end connected to the oil supply end, and the other end connected to the two valve cores respectively through the oil supply pipeline; There are two control ports B. One end of each control port B is connected to the valve core through a first execution pipeline, and the other end is connected to the actuator through a second execution pipeline. The return port T has one end connected to the return oil tank, and the other end connected to the two valve cores respectively through the return oil pipeline; When the foot pedal controls the valve core to be in the initial state, the valve core, the oil supply line, and the first execution line are all in a non-conductive state, and the return line is connected to the valve core, so that the oil in the valve core flows back to the return oil tank through the return line; when the foot pedal controls the valve core to be in the working state, the valve core, the oil supply line, the first execution line, and the second execution line are all in a conductive state, so that the oil supply end can supply oil to the actuator in sequence through the oil supply port P, the valve core, the first execution line, and the second execution line, and the return line is in a non-conductive state.

[0016] In summary, this application features two valve cores, enabling simultaneous control of two actuators (and also allowing for unilateral braking, as detailed in Embodiment 2), replacing existing power-assisted cylinders or boosters. Firstly, existing power-assisted cylinders or boosters contain multiple internal seals; failure of these seals during use leads to significant oil leakage. This application, however, is a brake valve, minimizing leakage even in the event of a problem. Secondly, existing power-assisted cylinders or boosters have low pressure tolerance and generate low-assistance, representing a low-pressure control method with a small final flow rate. This application, without pressure limitations, enables high-pressure, high-flow braking.

[0017] This application also provides a dual-power braking system for tractors, including the aforementioned dual-power braking valve for tractors. Therefore, it possesses all the beneficial effects of the dual-power braking valve for tractors, which will not be specifically elaborated here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the valve core in the dual-power brake valve for tractors provided in this application; Figure 2 A schematic diagram of the tractor dual-power brake valve provided in this application in its initial state; Figure 3 This is a schematic diagram of the tractor dual power brake valve in its working state, as provided in this application.

[0020] Reference numerals in the attached diagram: 1-First valve core; 2-Second valve core; 3-Inlet port P; 4-First oil supply line; 5-Second oil supply line; 6-First control port B; 7-Second control port B; 8-First actuation line; 9-Return port T; 10-First return line; 11-Working reversing position; 12-Initial reversing position; 13-First connecting pipe; 14-Second connecting pipe; 15-Third connecting pipe; 16-First pressure balancing line; 17-Second pressure balancing line; 18-Feedback line; 19-Reset component; 20-Connecting pin; 21-First linkage rod; 22-Second linkage rod; 23-Auxiliary reversing position; 24-Second return line. Detailed Implementation

[0021] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order presented herein; rather, changes that will be apparent upon understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity. The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application. Throughout this specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. Conversely, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between. As used herein, the term "and / or" includes any one of the relevant items listed and any combination of any two or more of them. Although terms such as "first," "second," and "third" may be used herein to describe individual components, assemblies, regions, layers, or portions, these components, assemblies, regions, layers, or portions are not limited by these terms. More precisely, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as such in the examples may also be referred to as the second component, assembly, region, layer, or part. For ease of description, spatial relational terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relational terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element.Therefore, the term "above" includes both "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., oscillating 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly. The terminology used herein is for describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprising," "including," and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. Variations in the shapes shown in the figures may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the figures but include changes in shape that occur during manufacturing. The features of the examples described herein may be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible as will be apparent upon understanding the disclosure of this application.

[0022] Example 1 To address the technical problems of large oil leakage and inability to meet high-pressure, high-flow braking requirements caused by existing mechanical or hydraulic braking systems, this application provides a dual-power brake valve for tractors, as shown in Figure 1-. Figure 3 The dual-power brake valve of the tractor is described in detail.

[0023] The tractor's dual-power brake valve includes two valve cores: a first valve core 1 and a second valve core 2, which are symmetrically arranged about the axis of the overall structure. Furthermore, both the first valve core 1 and the second valve core 2 are connected to a foot pedal component; the foot pedal component can control the first valve core 1 and the second valve core 2 to be in their initial or operating states.

[0024] The tractor's dual-power brake valve also includes an oil supply port P3, combined with... Figure 3 As shown, one end of it is connected to the oil supply end, and the other end is connected to the first valve core 1 through the first oil supply pipeline 4 and to the second valve core 2 through the second oil supply pipeline 5. When both the first valve core 1 and the second valve core 2 are in the working position reversal position, the oil stored at the oil supply end can be supplied to the first valve core 1 and the second valve core 2 through the oil supply port P3 via the oil supply pipeline.

[0025] The tractor's dual-power brake valve also includes a control port B, combined with... Figure 3As shown, there are two control ports B, namely the first control port B6 and the second control port B7. One end of the first control port B6 and the second control port B7 are connected to the valve core through the first execution pipeline 8, and the other end is connected to the actuator through the second execution pipeline. That is, when the first valve core 1 and the second valve core 2 are both in the reversing position, the oil that is guided to the valve core through the oil supply port P3 can finally be guided to the actuator through the first control port B6 and the second control port B7, thereby driving the actuator to run.

[0026] The tractor's dual-power brake valve also includes a return port T9, combined with... Figure 2 As shown, one end of the return oil port T9 is connected to the return oil tank, and the other end is connected to the first valve core 1 through the first return oil pipeline 10, and to the second valve core 2 through the second return oil pipeline 24.

[0027] In actual use, when the foot pedal component controls the valve core in the initial state, the valve core is not connected to the first oil supply line 4, the second oil supply line 5, the first actuation line 8, and the second actuation line. The first return oil line 10 and the second return oil line 24 are connected to the valve core, allowing the oil in the valve core to flow back to the return oil tank through the first return oil line 10 and the second return oil line 24. When the foot pedal component controls the valve core in the working state, the first valve core 1 is connected to the first oil supply line 4 and the first actuation line 8, and the second valve core 2 is connected to the second oil supply line 5 and the second actuation line. This allows the oil supply end to supply oil to the actuator sequentially through the oil supply port P3, the first valve core 1, the first actuation line 8, the first control port B6, and the second actuation line. It can also supply oil through the oil supply port P3, the second valve core 2, the second actuation line, and the second control port B6. 7 and the second actuation pipeline supply oil to the actuator. At this time, the first return oil pipeline 10 and the first valve core 1 are in a non-conductive state, and the second return oil pipeline 24 and the second valve core 2 are in a non-conductive state.

[0028] In summary, this application comprises a first valve core 1 and a second valve core 2 forming a dual-power brake valve, capable of simultaneously controlling the operation of two actuators (and also enabling unilateral braking, as detailed in Embodiment 2), replacing existing power-assisted cylinders or boosters. Firstly, existing power-assisted cylinders or boosters contain multiple internal seals; failure of these seals during use leads to significant oil leakage. This application, however, is not a power-assisted cylinder but a brake valve, minimizing leakage even in the event of a problem. Secondly, existing power-assisted cylinders or boosters have low pressure tolerance and generate low-assistance, representing a low-pressure control method with a small final flow rate. This application, however, has no pressure limitations, enabling high-pressure, high-flow braking.

[0029] In this embodiment, since the first valve core 1 and the second valve core 2 have the same structure, the first valve core 1 will be described in detail below. Specifically, the first valve core 1 has a working reversing position 11 and an initial reversing position 12 sequentially along the force application direction of the foot pedal component; according to Figure 2 As shown in the diagram, the force applied by the foot pedal component is vertically downward. Therefore, the first valve core 1 has a working reversing position 11 and an initial reversing position 12 in sequence along the vertically downward direction.

[0030] Combination Figure 1 As shown, the working reversing position 11 has five working valve ports: working valve port D1, working valve port D2, working valve port D3, working valve port D4, and working valve port D5. Working valve port D1 is normally closed; that is, when the first valve core 1 is in the working reversing position 11, even if an external oil pipe is connected to working valve port D1, no oil will flow. Working valve port D2 is connected to working valve port D3 via the first connecting pipe 13. Therefore, when the first valve core 1 is in the working reversing position 11, if an external oil pipe is connected to working valve port D2, oil will flow to the first valve core 1 and can then flow out through working valve port D3. The working valve port D4 is connected to the working valve port D5 through the second connecting pipe 14. Similarly, when the first valve core 1 is in the working reversing position 11, if there is an external oil pipe connected to the working valve port D, the oil will be guided from the working valve port D4 to the first valve core 1, and the oil can be guided out through the second connecting pipe 14 and the working valve port D5.

[0031] Still combined Figure 1 As shown, the initial reversing position 12 has five working valve ports: working valve port D11, working valve port D12, working valve port D13, working valve port D14, and working valve port D15. Working valve port D11 is connected to working valve port D13 via a third connecting pipe 15, according to... Figure 1 The arrow direction in the third connecting pipe 15 indicates that when oil is introduced from the working valve port D13 to the first valve core 1, it can eventually be discharged from the first valve core 1 through the working valve port D11. Among them, the working valve ports D12, D14 and D15 are all in the normally closed state.

[0032] In practical use, combined with Figure 2As shown in the light blue oil circuit, when the foot pedal component controls the valve core to be in the initial reversing position 12, the first valve core 1 is in its initial state. When the valve core is in its initial state, it is in the oil return state. Specifically, the oil supply port P3 corresponds to the working valve port D12. Since the working valve port D12 is normally closed in the initial reversing position 12, the oil supply port P3 will not supply oil to the first valve core 1 at this time. The oil return port T9 is connected to the working valve port D11, and the working valve port D13 is connected to the first actuation pipeline 8, so that the oil of the actuator flows back to the oil return tank in sequence through the first actuation pipeline 8, the working valve port D13, the third connecting pipe 15, and the working valve port D11.

[0033] Combination Figure 3 As shown in the red and green oil circuits, when the foot pedal component control valve core is in the working reversing position 11, the first valve core 1 is in the working state. When the first valve core 1 is in the working state, oil can be supplied to the actuator through the first valve core 1. Specifically, the return port T9 corresponds to the working valve port D1. Since the working valve port D1 is normally closed in the working reversing position 11, the return port T9 will not return oil at this time. Among them, the oil supply port P3 is connected to the working valve port D2 through the first oil supply pipeline 4, and the working valve port D3 is connected to the first execution pipeline 8, so that the oil supply end can supply oil to the actuator in sequence through the oil supply port P3, the first connecting pipe 13, the first execution pipeline 8, and the second execution pipeline.

[0034] It is worth noting that: Figure 3 In the diagram, the red oil circuit refers to the process of supplying oil to the first valve core 1 and the second valve core 2 through the oil supply end, oil supply port P3, the first oil supply line 4, and the second oil supply line 5. The green oil circuit refers to the process of supplying oil to the actuator through the first valve core 1 and the second valve core 2.

[0035] In summary, the state of the valve core can be controlled by the pressure applied to the foot pedal component. If the foot is not pressed, the valve core is in its initial state. When the foot is pressed, the valve core is pushed downwards (the valve core moves down), causing the valve core to be in the working state. By matching the brake pedal with an appropriate pedal ratio, the braking function of the entire vehicle can be achieved.

[0036] In this embodiment, the valve core also has an auxiliary reversing position 23 located between the working reversing position 11 and the initial reversing position 12; combined with Figure 1 As shown, the auxiliary position has 5 working valve ports, namely working valve port D6, working valve port D7, working valve port D8, working valve port D9 and working valve port D10; working valve ports D6, D7 and D8 are all normally closed, and working valve ports D9 and D10 are connected by a third connecting pipe 15.

[0037] In actual use, when the foot pedal is pressed down, it transitions from the initial state to the auxiliary reversing position 23, and finally reaches the working state. This setting ensures that the valve core generates sufficient force during its movement, increases the stroke of the valve core from the initial state to the working state, improves the braking experience, and prevents the problem of a short stroke and poor braking experience when the stroke from the initial state to the working state is too short.

[0038] In this embodiment, the tractor dual-power brake valve further includes a pressure balancing unit connected between the two valve cores. The pressure balancing unit includes a first pressure balancing line 16 and a second pressure balancing line 17; combined with Figure 2 As shown, when the first valve core 1 and the second valve core 2 are in the initial state, one end of the first pressure balancing pipeline 16 corresponds to the working valve port D14, and the other end is connected to the first actuation pipeline 8. Since the working valve port D14 is normally closed in the initial state, there will be no return oil. Also, since the first valve core 1 and the second valve core 2 are not connected, there will be no pressure balance adjustment between the first valve core 1 and the second valve core 2. In addition, the two ends of the second pressure balancing pipeline 17 correspond to the working valve ports D15 of the first valve core 1 and the second valve core 2, respectively. Since the working valve ports D15 of the first valve core 1 and the second valve core 2 are normally closed in the initial state, there will still be no pressure balance adjustment between the first valve core 1 and the second valve core 2 through the second pressure balancing pipeline 17.

[0039] Combination Figure 3 As shown, when the valve core is in the working state, one end of the first pressure balancing pipeline 16 is connected to the working valve port D4, and the other end is connected to the first actuation pipeline 8; the two ends of the second pressure balancing pipeline 17 are respectively connected to the working valve ports D15 of the first valve core 1 and the second valve core 2, so that the oil pressure of the two valve cores is the same. In actual use, when the output of the left and right pedals is uneven due to mechanical structure misalignment, the output pressure can be balanced through the first pressure balancing pipeline 16 and the second pressure balancing pipeline 17, thereby achieving smooth braking adjustment. Specifically, the oil from the oil supply end is guided to the actuator through the working port P, the first oil supply pipeline 4, the first connecting pipe 13 of the first valve core 1, and the working valve port D15 in sequence. At the same time, a portion of the oil is guided through the working valve port D15 to the first pressure balancing pipeline 16 of the first valve core 1, and then through the second pressure balancing pipeline 17 to the second valve core 2, thereby achieving pressure balance between the first valve core 1 and the second valve core 2.

[0040] In this embodiment, combined with Figure 3The blue oil circuit in the tractor's dual-power brake valve also includes a feedback line 18. The feedback line 18 is located between the bottom of the valve core and the first actuator line, and is connected to the first actuator line. In actual use, when the valve core is in the initial state (return oil state), some oil will flow back to the feedback line 18. When the foot pedal is pressed down to start braking, the oil in the feedback line 18 will generate an upward force opposite to the downward pressure of the foot pedal, thereby increasing the pedal feel of the brake valve and providing a more comfortable feel.

[0041] In this embodiment, combined with Figure 2 and Figure 3 As shown, the tractor dual-power brake valve also includes a reset member 19; the reset member 19 is disposed between the bottom of the valve core and the valve seat. Optionally, the reset member 19 is a reset spring.

[0042] Specifically, when the foot pedal is pressed, the valve core moves downward and compresses the return spring. When the foot pedal is not pressed, the return spring causes the valve core to move upward, ensuring that the valve core is in its initial position when not in operation, thus achieving greater reliability.

[0043] Example 2 This application also provides a dual-power braking system for a tractor, including the aforementioned dual-power braking valve. Furthermore, the foot pedal component includes a foot pedal and a linkage component; both ends of the linkage component are connected to the top of the foot pedal and the valve core, respectively; pressing the foot pedal controls the movement of the two valve cores via the linkage component; specifically, the linkage component includes a first linkage rod 21, a second linkage rod 22, and a connecting pin 20; the first linkage rod 21 is disposed on the top of the first valve core, and the second linkage rod 22 is disposed on the top of the second valve core; the first linkage rod 21 and the second linkage rod 22 are detachably connected via the connecting pin 20.

[0044] In actual use, when the two linkage rods are not connected, the foot pedal can brake the valve core on one side; when the two linkage rods are connected by the connecting pin 20, the foot pedal can brake the upper valve core.

[0045] In this embodiment, the actuator is further defined as a brake; the control port B is connected to the brake through the second actuator line, and the brake pressure can be provided to the brake through the control port B and the second actuator line to achieve service braking.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A dual-power brake valve for a tractor; characterized in that, include: The valve core is provided in two parts, and both valve cores are connected to the foot pedal component; the foot pedal component can control the valve core to be in the initial state or the working state. The oil supply port P has one end connected to the oil supply end, and the other end connected to the two valve cores respectively through the oil supply pipeline; There are two control ports B. One end of each control port B is connected to the valve core through a first execution pipeline, and the other end is connected to the actuator through a second execution pipeline. The return port T has one end connected to the return oil tank, and the other end connected to the two valve cores respectively through the return oil pipeline; When the foot pedal controls the valve core to be in the initial state, the valve core, the oil supply line, and the first execution line are all in a non-conductive state, and the return line is connected to the valve core, so that the oil in the valve core flows back to the return oil tank through the return line; when the foot pedal controls the valve core to be in the working state, the valve core, the oil supply line, the first execution line, and the second execution line are all in a conductive state, so that the oil supply end can supply oil to the actuator in sequence through the oil supply port P, the valve core, the first execution line, and the second execution line, and the return line is in a non-conductive state.

2. The tractor dual-power brake valve according to claim 1, characterized in that, The valve core has a working reversing position and an initial reversing position in sequence along the force direction of the foot pedal component; The working reversing position has five working valve ports, namely working valve port D1, working valve port D2, working valve port D3, working valve port D4 and working valve port D5; wherein working valve port D1 is normally closed, working valve port D2 is connected to working valve port D3 through a first connecting pipe, and working valve port D4 is connected to working valve port D5 through a second connecting pipe. The initial reversing position has five working valve ports, namely working valve port D11, working valve port D12, working valve port D13, working valve port D14 and working valve port D15; wherein working valve port D11 is connected to working valve port D13 through a third connecting pipe, and working valve ports D12, D14 and D15 are all in a normally closed state. When the foot pedal component controls the valve core to be in the initial reversing position, the valve core is in the initial state. When the valve core is in the initial state, the oil supply port P corresponds to the working valve port D12; the oil return port T is connected to the working valve port D11; and the working valve port D13 is connected to the first execution pipeline, so that the oil of the actuator flows back to the oil return tank in sequence through the first execution pipeline, the working valve port D13, the third connecting pipe, and the working valve port D11. When the foot pedal component controls the valve core to be in the working reversing position, the valve core is in the working state. When the valve core is in the working state, the oil return port T corresponds to the working valve port D1; the oil supply port P is connected to the working valve port D2 through the oil supply pipeline, and the working valve port D3 is connected to the first execution pipeline, so that the oil supply end can supply oil to the actuator in sequence through the oil supply port P, the first connecting pipe, the first execution pipeline and the second execution pipeline.

3. The tractor dual-power brake valve according to claim 2, characterized in that, The valve core also has an auxiliary reversing position located between the working reversing position and the initial reversing position; The auxiliary reversing position has five working valve ports, namely working valve port D6, working valve port D7, working valve port D8, working valve port D9 and working valve port D10; working valve ports D6, D7 and D8 are all normally closed, and working valve ports D9 and D10 are connected by the third connecting pipe.

4. The tractor dual-power brake valve according to claim 2, characterized in that, The tractor dual-power brake valve also includes a pressure balancing unit connected between the two valve cores, the pressure balancing unit including a first pressure balancing pipeline and a second pressure balancing pipeline; When the valve core is in the initial state, one end of the first pressure balancing pipeline corresponds to the working valve port D14, and the other end is connected to the first actuation pipeline; the two ends of the second pressure balancing pipeline correspond to the working valve port D15 respectively. When the valve core is in the working state, one end of the first pressure balancing pipeline is connected to the working valve port D4, and the other end is connected to the first execution pipeline; both ends of the second pressure balancing pipeline are respectively connected to the working valve port D15, so that the oil pressure of the two valve cores is the same.

5. The tractor dual-power brake valve according to claim 2, characterized in that, The tractor dual-power brake valve also includes a feedback pipeline; The feedback pipeline is located between the bottom of the valve core and the first execution pipeline, and the feedback pipeline is connected to the first execution pipeline.

6. The tractor dual-power brake valve according to claim 1, characterized in that, The tractor dual-power brake valve also includes a reset component; The reset element is disposed between the bottom of the valve core and the valve seat.

7. The tractor dual-power brake valve according to claim 6, characterized in that, The reset component is a reset spring.

8. A dual-power braking system for a tractor, characterized in that, Includes the tractor dual-power brake valve as described in any one of claims 1-7.

9. The tractor dual-power braking system according to claim 8, characterized in that, The foot pedal component includes a foot pedal and a linkage component; Both ends of the linkage component are connected to the foot pedal and the top of the valve core, respectively; when the foot pedal is pressed, the linkage component can control the movement of the two valve cores. The linkage component includes a linkage rod and a connecting pin; the linkage rods are respectively disposed on the top of the valve core, and the two linkage rods on the top of the valve core are detachably connected by the connecting pin; When the two linkage rods are not connected, the foot pedal can brake the valve core on one side; when the two linkage rods are connected by the connecting pin, the foot pedal can brake the valve core on both sides.

10. The tractor dual-power braking system according to claim 8, characterized in that, The actuator is a brake; The control port B is connected to the brake through the second execution pipeline. The control port B and the second execution pipeline can provide braking pressure to the brake to achieve service braking.

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