Single-loop integrated brake assembly for tractor
By designing a single-loop integrated brake assembly for tractors and integrating management of liquid filling and braking systems, the problems of low integration and long response time of traditional systems are solved, and higher integration and faster liquid filling and response are achieved.
Patent Information
- Application Number
- CN202421705143.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-18
AI Technical Summary
The existing drag braking system has low integration, resulting in loss and leakage of pressure along the way between valves, slow liquid filling response speed, long response time, and limited by space layout.
Design a single-circuit integrated brake assembly for tractors, including main valve, filter, throttle valve, check valve, pilot valve, brake valve, etc., and connect these valves through oil channels to achieve integrated management of liquid filling and braking.
It improves the integration of the system, reduces pressure loss and leakage between valves, shortens the liquid filling response time, improves the liquid filling performance and pressure holding performance, and has a wider adaptability.
Smart Images
Figure CN222756569U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of braking, in particular to a single-circuit integrated braking assembly for a tractor. Background Art
[0002] With the continuous development and improvement of tractor functions, the requirements of tractors for braking systems are also increasing. However, the traditional tractor braking system has a low integration level, and the integrated brake assembly of tractors will become the future development trend. The integrated brake assembly includes a filling valve and a brake valve. The filling valve is mainly used to fill the accumulator in the brake system so that the brake system can have sufficient oil supply when working. The brake valve controls the on-off of the oil circuit between the brake and the accumulator. Therefore, the integrated brake assembly can simplify the system pipeline and improve the system integration level. However, the existing technology mainly arranges the filling valve and the brake valve separately, which inevitably causes pressure loss and leakage along the valve, which in turn causes a slow filling response speed and a long response time; and is limited by the trouble of spatial layout. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a single-circuit integrated brake assembly for a tractor to solve the above-mentioned problem.
[0004] The utility model solves the above technical problems with the following technical solutions: a single-circuit integrated brake assembly for a tractor, comprising: a main valve, a filter, a throttle valve, a check valve, a pilot valve, a brake valve, an oil inlet, a filling port, a bypass port, a brake port and an oil return port; the main valve is connected to the oil inlet of the filter through an oil passage, the oil outlet of the filter is connected to the oil inlet of the throttle valve through an oil passage, the oil outlet of the throttle valve is connected to the oil inlet of the check valve through an oil passage, the oil outlet of the check valve is connected to the filling port through an oil passage, the pilot valve is connected to the main valve through an oil passage, the pilot valve and the brake valve are both connected to the oil passage connecting the oil outlet of the check valve and the filling port through an oil passage, the non-spring chamber of the brake valve is connected to the brake pedal of the tractor, the main valve is connected to the oil inlet and the bypass port through an oil passage, the brake port is connected to the brake valve through an oil passage, and the oil return port is connected to the pilot valve and the brake valve through an oil passage.
[0005] The beneficial effects of the utility model are as follows: the utility model integrates the main valve, pilot valve, brake valve, etc. used for filling and braking into one, which not only occupies a small space, simplifies the system piping, and improves the system integration, but also solves the problems of pressure loss and leakage along the valves in the prior art, so that the filling response speed is fast and the response time is short, the filling performance and pressure maintaining performance are improved, and the adaptability is wider.
[0006] On the basis of the above technical solution, the present invention can also be improved as follows.
[0007] Furthermore, the non-spring chamber of the pilot valve is connected to an oil passage connecting the oil outlet of the one-way valve and the filling port through an oil passage.
[0008] The beneficial effect of adopting the above further scheme is: it is conducive to delivering the pilot oil from the oil inlet to the non-spring chamber of the pilot valve after passing through the main valve, filter, throttle valve and check valve in sequence in the initial state, so that the pressure generated by the pilot oil and the spring force of the pilot valve act together on the pilot valve. When the pressure generated by the pilot oil is greater than the spring force of the pilot valve, the reversal of the pilot valve is achieved.
[0009] Furthermore, the upper position or the lower position of the pilot valve is connected to the spring chamber of the main valve, the oil return port, and the oil channel connecting the oil outlet of the one-way valve and the filling port through an oil channel.
[0010] The beneficial effect of adopting the above further scheme is that the reversing of the pilot valve is conducive to switching to the upper or lower position. When the lower position of the pilot valve is connected to the spring chamber of the main valve, the oil return port and the oil channel connecting the oil outlet and the filling port of the one-way valve, it indicates that the pressure generated by the pilot oil at this time is less than the spring force of the pilot valve, and the pressure oil is being transported to the filling port from the oil inlet through the main valve, the filter, the throttle valve and the one-way valve in sequence to achieve filling; when the upper position of the pilot valve is connected to the spring chamber of the main valve, the oil return port and the oil channel connecting the oil outlet and the filling port of the one-way valve, it indicates that the pressure generated by the pilot oil at this time is greater than the spring force of the pilot valve, the pilot oil in the spring chamber of the main valve flows back to the oil tank through the pilot valve, the pilot oil in the spring chamber of the main valve is unloaded, and then the main valve is reversed, the accumulator is filled, and the excess oil flows to other hydraulic systems through the bypass port of the main valve, and the filling is completed.
[0011] Furthermore, the oil inlet and the bypass port are both connected to the upper or lower position of the main valve through an oil passage.
[0012] The beneficial effect of adopting the above-mentioned further scheme is: it is conducive to causing most of the pressure oil to flow to the filling port for filling when the upper position of the main valve is connected to the oil inlet and the bypass port; when the lower position of the main valve is connected to the oil inlet and the bypass port, the pressure oil flowing into the main valve from the oil inlet flows out to the bypass port and the filling port, but at this time the filling port has been filled with liquid, and the one-way valve is used to achieve pressure maintenance after the filling is completed.
[0013] Furthermore, the non-spring chamber of the main valve is connected to an oil passage connecting the oil inlet and the main valve through an oil passage.
[0014] The beneficial effect of adopting the above further solution is that it is conducive to injecting the pilot oil flowing out of the oil inlet into the non-spring chamber and the spring chamber of the main valve in the initial state, and cooperating with the spring force of the main valve to achieve the reversal of the main valve.
[0015] Furthermore, the upper position or the lower position of the brake valve is connected to the brake port, the oil return port, and the oil channel connecting the one-way valve oil outlet and the filling port through an oil channel.
[0016] The beneficial effect of adopting the above further solution is that it is conducive to achieving the reversal of the brake valve when the operator releases the brake pedal, thereby achieving braking of the tractor.
[0017] Furthermore, the ends of the oil inlet and the bypass port away from the main valve are connected to a hydraulic pump and a downstream hydraulic device respectively.
[0018] The beneficial effect of adopting the above further scheme is that the hydraulic pump is conducive to inputting pressure oil and pilot oil into the brake assembly through the oil inlet; at the same time, after the filling is completed, it is conducive to outputting the pressure oil input by the hydraulic pump from the bypass port to the downstream hydraulic device for use by the downstream hydraulic device.
[0019] Furthermore, one end of the filling port away from the one-way valve is connected to an accumulator.
[0020] The beneficial effect of adopting the above further solution is that it is conducive to injecting pressure oil into the accumulator through the filling port, thereby realizing the filling of the accumulator.
[0021] Furthermore, one end of the brake port away from the brake valve is connected to the brake.
[0022] The beneficial effect of adopting the above further solution is that it is helpful to use the accumulator that has been fully filled with liquid to provide the brake with the pressure oil required for braking.
[0023] Furthermore, one end of the oil return port away from the pilot valve and the brake valve is connected to an oil tank.
[0024] The beneficial effect of adopting the above further scheme is that after the upper position is connected to the system when the pilot valve is switched, the pilot oil in the upper position of the main valve is connected to the oil tank, thereby unloading the pilot oil in the upper position of the main valve, thereby causing the main valve to switch to the lower position, and at the same time facilitating the injection of the pressure oil in the brake into the oil tank in the non-braking state. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 The present invention is a schematic diagram of the overall structure of an embodiment of the present invention.
[0026] in, Figure 1 The outermost dotted line in the figure represents the entire brake assembly, and the inner dotted line represents the flow channel of the pilot oil.
[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0028] 1. Main valve; 2. Filter; 3. Throttle valve; 4. Check valve; 5. Pilot valve; 6. Brake valve; 7. Oil inlet; 8. Filling port; 9. Bypass port; 10. Brake port; 11. Oil return port. DETAILED DESCRIPTION
[0029] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0030] like Figure 1 As shown, a single-circuit integrated brake assembly for a tractor comprises: a main valve 1, a filter 2, a throttle valve 3, a check valve 4, a pilot valve 5, a brake valve 6, an oil inlet 7, a filling port 8, a bypass port 9, a brake port 10 and an oil return port 11; the main valve 1 is connected to the oil inlet of the filter 2 through an oil passage, the oil outlet of the filter 2 is connected to the oil inlet of the throttle valve 3 through an oil passage, the oil outlet of the throttle valve 3 is connected to the oil inlet of the check valve 4 through an oil passage, and the oil outlet of the check valve 4 is connected to the oil inlet of the check valve 4 through an oil passage. The filling port 8 is connected through an oil channel, the pilot valve 5 is connected to the main valve 1 through an oil channel, the pilot valve 5 and the brake valve 6 are both connected to the oil channel connecting the oil outlet of the one-way valve 4 and the filling port 8 through an oil channel, the non-spring chamber of the brake valve 6 is connected to the tractor brake pedal, the main valve 1 is connected to the oil inlet 7 and the bypass port 9 through an oil channel, the brake port 10 is connected to the brake valve 6 through an oil channel, and the oil return port 11 is connected to the pilot valve 5 and the brake valve 6 through an oil channel.
[0031] It should be noted that in the technical solution of the present utility model, the pilot oil and the pressure oil are essentially the same thing, both are oils that provide pressure, but they are named differently in different working stages of the brake assembly.
[0032] The beneficial effects of the utility model are as follows: the utility model integrates the main valve, pilot valve, brake valve, etc. used for filling and braking into one, which not only occupies a small space, simplifies the system piping, and improves the system integration, but also solves the problems of pressure loss and leakage along the valves in the prior art, so that the filling response speed is fast and the response time is short, the filling performance and pressure maintaining performance are improved, and the adaptability is wider.
[0033] Preferably, Figure 1 As shown, the non-spring chamber of the pilot valve 5 is connected to the oil passage connecting the oil outlet of the one-way valve 4 and the filling port 8 through an oil passage.
[0034] It should be noted that: in the preferred embodiment of the present utility model, the spring force of the pilot valve 5 is upward.
[0035] The beneficial effect of adopting the above-mentioned preferred scheme is that it is conducive to delivering the pilot oil from the oil inlet to the non-spring chamber of the pilot valve after passing through the main valve, filter, throttle valve and check valve in sequence in the initial state, so that the pressure generated by the pilot oil and the spring force of the pilot valve act together on the pilot valve. When the pressure generated by the pilot oil is greater than the spring force of the pilot valve, the reversal of the pilot valve is achieved.
[0036] Preferably, Figure 1 As shown, the upper or lower position of the pilot valve 5 is connected to the spring chamber of the main valve 1 , the oil return port 11 , and the oil channel connecting the oil outlet of the one-way valve 4 and the filling port 8 through an oil channel.
[0037] Among them, it should be noted that: in the technical solution of the present utility model, the function of the oil channel in the upper position of the pilot valve 5 is to allow the pilot oil entering the upper position of the pilot valve 5 to flow out of the upper position of the pilot valve 5; the function of the oil channel in the lower position of the pilot valve 5 is to allow the pilot oil entering the lower position of the pilot valve 5 to flow out of the lower position of the pilot valve 5.
[0038] The beneficial effects of adopting the above-mentioned preferred scheme are: the reversing of the pilot valve is conducive to switching to the upper or lower position. When the lower position of the pilot valve is connected to the spring chamber of the main valve, the oil return port and the oil channel connecting the oil outlet and the filling port of the one-way valve, it indicates that the pressure generated by the pilot oil at this time is less than the spring force of the pilot valve, and the pressure oil is being transported to the filling port from the oil inlet through the main valve, the filter, the throttle valve and the one-way valve in sequence to achieve filling; when the upper position of the pilot valve is connected to the spring chamber of the main valve, the oil return port and the oil channel connecting the oil outlet and the filling port of the one-way valve, it indicates that the pressure generated by the pilot oil at this time is greater than the spring force of the pilot valve, the pilot oil in the spring chamber of the main valve flows back to the oil tank through the pilot valve, the pilot oil in the spring chamber of the main valve is unloaded, and then the main valve is reversed, the accumulator is filled, and the excess oil flows to other hydraulic systems through the bypass port of the main valve, and the filling is completed.
[0039] Preferably, Figure 1 As shown, the oil inlet 7 and the bypass port 9 are both connected to the upper or lower position of the main valve 1 through an oil passage.
[0040] Among them, it should be noted that: in the technical solution of the present utility model, the oil channel in the upper position of the main valve 1 has a throttling effect, which reduces the pressure oil entering the upper position of the main valve 1 from the oil inlet 7 and flows into the bypass port 9, so that most of the pressure oil entering the upper position of the main valve 1 from the oil inlet 7 flows to the filling port 8; the function of the oil channel in the lower position of the main valve 1 is to make the pressure oil entering the lower position of the main valve 1 flow out to the filling port 8 and the bypass port 9.
[0041] The beneficial effect of adopting the above-mentioned preferred scheme is: it is conducive to allowing most of the pressure oil to flow to the filling port for filling when the upper position of the main valve is connected to the oil inlet and the bypass port; when the lower position of the main valve is connected to the oil inlet and the bypass port, the pressure oil flowing into the main valve from the oil inlet flows out to the bypass port and the filling port, but at this time the filling port has been filled with liquid, and the one-way valve is used to achieve pressure maintenance after the filling is completed.
[0042] Preferably, Figure 1 As shown, the non-spring chamber of the main valve 1 is connected to the oil passage connecting the oil inlet 7 and the main valve 1 through an oil passage.
[0043] It should be noted that: in the preferred embodiment of the present utility model, the spring force of the main valve 1 is downward.
[0044] The beneficial effect of adopting the above preferred solution is that it is conducive to injecting the pilot oil flowing out of the oil inlet into the non-spring chamber and the spring chamber of the main valve in the initial state, and cooperating with the spring force of the main valve to achieve the reversal of the main valve.
[0045] Preferably, Figure 1 As shown, the upper or lower position of the brake valve 6 is connected to the brake port 10, the oil return port 11 and the oil channel connecting the oil outlet of the one-way valve 4 and the filling port 8 through the oil channel.
[0046] The beneficial effect of adopting the above preferred solution is that it is conducive to achieving the reversal of the brake valve when the operator releases the brake pedal, thereby achieving braking of the tractor.
[0047] Preferably, the ends of the oil inlet 7 and the bypass port 9 away from the main valve 1 are connected to a hydraulic pump and a downstream hydraulic device respectively.
[0048] The beneficial effects of adopting the above preferred scheme are: the hydraulic pump is conducive to inputting pressure oil and pilot oil into the brake assembly through the oil inlet; at the same time, after the filling is completed, it is conducive to outputting the pressure oil input by the hydraulic pump from the bypass port to the downstream hydraulic device for use by the downstream hydraulic device.
[0049] Preferably, one end of the filling port 8 away from the one-way valve 4 is connected to an accumulator.
[0050] The beneficial effect of adopting the above preferred solution is that it is conducive to injecting pressure oil into the accumulator through the filling port to achieve the filling of the accumulator.
[0051] Preferably, one end of the brake port 10 away from the brake valve 6 is connected to a brake.
[0052] The beneficial effect of adopting the above preferred solution is that it is helpful to use the accumulator that has been filled with liquid to provide the brake with the pressure oil required for braking.
[0053] Preferably, one end of the oil return port 11 away from the pilot valve 5 and the brake valve 6 is connected to an oil tank.
[0054] The beneficial effect of adopting the above-mentioned preferred scheme is that after the upper position is connected to the system when the pilot valve is switched, the pilot oil in the upper position of the main valve is connected to the oil tank, thereby unloading the pilot oil in the upper position of the main valve, thereby causing the main valve to switch to the lower position, and at the same time facilitating the injection of the pressure oil in the brake into the oil tank in the non-braking state.
[0055] The working process of the utility model is described below by an embodiment:
[0056] like Figure 1 As shown, the working process of the utility model is divided into three parts: filling the accumulator, braking, and filling the accumulator again:
[0057] Filling the accumulator: The pressure oil in the hydraulic pump enters the upper position of the main valve 1 from the oil inlet 7 in the initial state. At this time, since the oil channel structure in the upper position of the main valve 1 has a throttling effect, most of the pilot oil entering the upper position of the main valve 1 passes through the filter 2, the throttle valve 3 and the check valve 4 in sequence, and enters the accumulator from the filling port 8 to fill the accumulator, and reduce the flow of the pilot oil from the upper position of the main valve 1 to the downstream hydraulic device through the bypass port 9;
[0058] In this process, the pressure oil in the hydraulic pump as the pilot oil comes out from the oil inlet 7 and is gradually injected into the non-spring chamber of the main valve 1, the non-spring chamber of the pilot valve 5 and the lower position of the pilot valve 5 through the oil channel, and the pilot oil is gradually input into the spring chamber of the main valve 1 through the oil channel in the lower position of the pilot valve 5. At this time, the main valve 1 is subjected to the downward pilot oil pressure and spring force, as well as the upward pilot oil pressure, and the downward force on the main valve 1 is greater than the upward force, so the main valve 1 is in Figure 1 The initial state shown; the pilot valve 5 is subjected to the downward pilot oil pressure and the upward spring force, and the downward force on the pilot valve 5 is smaller than the upward force, so the pilot valve 5 is in Figure 1 The initial state shown;
[0059] When the pressure of the accumulator after filling gradually reaches the set upper filling limit pressure, the downward pilot oil pressure of the pilot valve 5 is greater than the upward spring force, so the pilot valve 5 changes direction, and the spring chamber of the main valve 1, the return oil port 11 and the oil channel connecting the oil outlet of the one-way valve 4 and the filling port 8 are connected to the upper position of the pilot valve 5, and the pilot oil in the spring chamber of the main valve 1 gradually enters the oil tank through the return oil port 11, and the pilot oil pressure in the spring chamber of the main valve 1 is unloaded to zero. At this time, the upward force on the main valve 1 is greater than the downward force, and the main valve 1 changes direction, and the oil inlet port 7 and the bypass port 9 are connected to the lower position of the main valve 1 through the oil channel. At this time, since the accumulator has been filled, most of the pressure oil entering the lower position of the main valve 1 will flow to the downstream hydraulic device through the bypass port 9, and the accumulator cooperates with the one-way valve to achieve pressure maintenance.
[0060] Braking: When the driver steps on the brake pedal in the tractor cab, the brake valve 6 is pushed downward by the brake pedal and the spring force of the brake valve 6 is pushed upward. The downward force on the brake valve 6 is greater than the upward force, and the brake valve 6 will be pushed upward. Figure 1 The initial state shown is reversed downward, so that the brake port 10, the oil return port 11 and the oil channel connecting the oil outlet of the one-way valve 4 and the filling port 8 are connected to the upper position of the brake valve 6. At this time, the pressure oil in the accumulator enters the upper position of the brake valve 6, and enters the brake from the upper position of the brake valve 6 through the brake port 10 to achieve braking. At the same time, the pressure input to the brake and the stroke of the brake pedal can be designed to be a linear relationship, thereby achieving a progressive braking effect. When the driver releases the brake pedal, the downward force on the brake valve 6 disappears, and under the upward spring force of the brake valve 6, the brake valve 6 is reset. Figure 1 In the initial state shown, the oil circuit between the brake and the accumulator is cut off, and the pressure oil in the brake returns to the oil tank through the oil circuit in the lower position of the brake valve 6, stopping braking.
[0061] Fill the accumulator again: After multiple braking, the accumulator pressure is lower than the set filling lower limit pressure, the downward pilot oil pressure of the non-spring chamber of the pilot valve 5 is less than the upward spring force of the pilot valve 5, and the pilot valve 5 is reset to Figure 1 In the initial state shown, the pressure oil enters the lower position of the pilot valve 5 from the lower position of the main valve 1 and is injected into the spring chamber of the main valve 1 through the oil channel. When the downward force on the main valve 1 is greater than the upward force, the main valve 1 is reset to Figure 1 In the initial state shown, the pressure oil entering the upper position of the main valve 1 reduces the flow rate entering the downstream hydraulic device from the bypass port 9, and most of it enters the accumulator through the filling port 8 to realize the refilling of the accumulator.
[0062] The above process is repeated to achieve repeated cycles of filling and braking.
[0063] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0066] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0068] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A single-circuit integrated brake assembly for a tractor, characterized in that: include: A main valve (1), a filter (2), a throttle valve (3), a check valve (4), a pilot valve (5), a brake valve (6), an oil inlet (7), a filling port (8), a bypass port (9), a brake port (10) and an oil return port (11); The main valve (1) is connected to the oil inlet of the filter (2) through an oil passage, the oil outlet of the filter (2) is connected to the oil inlet of the throttle valve (3) through an oil passage, the oil outlet of the throttle valve (3) is connected to the oil inlet of the one-way valve (4) through an oil passage, the oil outlet of the one-way valve (4) is connected to the filling port (8) through an oil passage, the pilot valve (5) is connected to the main valve (1) through an oil passage, and the pilot valve (5) and the The brake valves (6) are connected to the oil passage connecting the oil outlet of the one-way valve (4) and the filling port (8) through an oil passage, the non-spring chamber of the brake valve (6) is connected to the brake pedal of the tractor, the main valve (1) is connected to the oil inlet (7) and the bypass port (9) through an oil passage, the brake port (10) is connected to the brake valve (6) through an oil passage, and the oil return port (11) is connected to the pilot valve (5) and the brake valve (6) through an oil passage.
2. A single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: The non-spring chamber of the pilot valve (5) is connected to an oil passage connecting the oil outlet of the one-way valve (4) and the filling port (8) through an oil passage.
3. The single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: The upper position or the lower position of the pilot valve (5) is connected to the spring chamber of the main valve (1), the oil return port (11), and the oil channel connecting the oil outlet of the one-way valve (4) and the filling port (8) through an oil channel.
4. The single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: The oil inlet (7) and the bypass port (9) are both connected to the upper position or the lower position of the main valve (1) through an oil passage.
5. The single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: The non-spring chamber of the main valve (1) is connected to an oil passage connecting the oil inlet (7) and the main valve (1) via an oil passage.
6. The single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: The upper position or the lower position of the brake valve (6) is connected to the brake port (10), the oil return port (11) and the oil channel connecting the oil outlet of the one-way valve (4) and the filling port (8) through an oil channel.
7. The single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: The ends of the oil inlet (7) and the bypass port (9) away from the main valve (1) are connected to a hydraulic pump and a downstream hydraulic device respectively.
8. The single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: One end of the liquid filling port (8) away from the one-way valve (4) is connected to an accumulator.
9. The single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: One end of the brake port (10) away from the brake valve (6) is connected to a brake.
10. The single-circuit integrated brake assembly for a tractor according to claim 1, characterized in that: One end of the oil return port (11) away from the pilot valve (5) and the brake valve (6) is connected to an oil tank.