Energy accumulator liquid filling pile-up valve, energy accumulator liquid filling device and braking system

Abstract

The utility model discloses an energy accumulator liquid filling pile-up valve, an energy accumulator liquid filling device and a braking system, and belongs to the technical field of braking systems. According to the energy accumulator liquid filling pile-up valve, the energy accumulator liquid filling device and the braking system, when liquid filling is needed, the feedback port can be communicated with the oil inlet by controlling the hydraulic control pilot valve and the electromagnetic valve, pilot oil is provided for the pump feedback port of the variable pump through the feedback port, and the variable pump can be controlled to work continuously; when liquid does not need to be filled, the hydraulic control pilot valve can enable the feedback port to be communicated with the oil return port so that pilot oil provided by the feedback port to the pump feedback port of the variable pump can be unloaded, the variable pump can be controlled to stop working, and the energy-saving effect is achieved. When the energy accumulator needs to be controlled to stop charging, the electromagnetic valve can be controlled to enable the feedback port to be communicated with the oil return port so that pilot oil provided by the feedback port to the pump feedback port of the variable pump can be unloaded, the response speed of the electromagnetic valve is high, and the response speed of a vehicle in a cold environment or when horsepower is insufficient can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of brake systems, in particular to an accumulator filling integrated valve, an accumulator filling device and a brake system. Background Art

[0002] With the acceleration of agricultural mechanization in my country and the intelligent development of tractors, the requirements for the safety, stability and energy saving of tractor braking systems are also constantly increasing.

[0003] At present, the single-circuit hydraulic braking form of tractors is relatively simple. In comparison, the dual-circuit braking system can not only ensure the completion of the braking action to the greatest extent, but also realize the braking of the two circuits without interfering with each other, and ensure that when one of the circuits fails, the other circuit continues to work normally, thereby effectively avoiding the occurrence of braking accidents caused by failure of the filling valve; moreover, the dual-circuit braking system can also control the internal structure of the filling valve to give priority to filling the accumulator with lower pressure, so that the pressure of the two accumulators can be maintained at the same level, thereby ensuring the stability of the pressure source of the braking system.

[0004] However, the existing accumulator charging integrated valve cannot achieve on-demand charging, has poor energy saving performance, and is prone to starting difficulties in cold weather and when the horsepower is insufficient. Utility Model Content

[0005] The utility model aims to provide an accumulator filling integrated valve, an accumulator filling device and a braking system, which not only have good energy saving performance but also can improve the response speed of the vehicle in a cold environment or when the horsepower is insufficient.

[0006] In order to achieve the above objectives, the following technical solutions are provided:

[0007] In a first aspect, an accumulator charging integrated valve is provided, comprising:

[0008] A valve body, the valve body comprising an oil inlet, two liquid filling ports, an oil return port and a feedback port;

[0009] A balancing valve, wherein the balancing valve is arranged on the valve body, the oil inlet hole of the balancing valve is connected with the oil inlet port, and the two oil outlet holes of the balancing valve are respectively connected with the two filling ports;

[0010] A hydraulically controlled pilot valve and a solenoid valve, wherein the hydraulically controlled pilot valve and the solenoid valve are both arranged on the valve body, the solenoid valve is located between the hydraulically controlled pilot valve and the feedback port, the oil inlet hole of the hydraulically controlled pilot valve and the hydraulically controlled end of the hydraulically controlled pilot valve are both communicated with the oil inlet, the first oil outlet hole of the hydraulically controlled pilot valve is communicated with the oil return port, the first oil inlet hole of the solenoid valve is communicated with the oil return port, the second oil inlet hole of the solenoid valve is communicated with the second oil outlet hole of the hydraulically controlled pilot valve, the oil outlet hole of the solenoid valve is communicated with the feedback port, and the feedback port is used to communicate with the pump feedback port of a variable pump;

[0011] The second oil outlet hole of the hydraulically controlled pilot valve can be communicated with the oil inlet hole of the hydraulically controlled pilot valve or the first oil outlet hole of the hydraulically controlled pilot valve;

[0012] The oil outlet hole of the solenoid valve can be communicated with the second oil inlet hole of the solenoid valve or the first oil inlet hole of the solenoid valve.

[0013] As an optional solution for the accumulator charging integrated valve, the balancing valve is a low-pressure priority balancing valve.

[0014] As an optional solution of the accumulator charging integrated valve, a first throttling structure is provided between the second oil outlet hole of the hydraulically controlled pilot valve and the oil inlet hole of the hydraulically controlled pilot valve; and / or,

[0015] A second throttling structure is provided between the second oil outlet hole of the hydraulically controlled pilot valve and the first oil outlet hole of the hydraulically controlled pilot valve.

[0016] As an optional solution for the accumulator charging integrated valve, the valve body further comprises a charging channel, one end of which is connected to the oil inlet, and the other end of which is respectively connected to the oil inlet hole of the balancing valve, the oil inlet hole of the hydraulically controlled pilot valve and the hydraulically controlled end of the hydraulically controlled pilot valve; and / or,

[0017] The valve body further comprises an oil return passage, one end of which is connected to the oil return port, and the other end of which is respectively connected to the first oil outlet hole of the hydraulic pilot valve and the first oil inlet hole of the solenoid valve; and / or,

[0018] The valve body further comprises a connecting channel, one end of which is connected to the second oil outlet hole of the hydraulically controlled pilot valve, and the other end of which is connected to the second oil inlet hole of the solenoid valve.

[0019] As an optional solution of the accumulator filling integrated valve, the accumulator filling integrated valve further includes a third throttling structure, and the third throttling structure is arranged in the filling channel; and / or,

[0020] The accumulator filling integrated valve also includes a one-way valve, which is arranged in the filling channel.

[0021] As an optional solution for the accumulator charging integrated valve, the valve body further comprises a pressure detection port, and the pressure detection port is communicated with the oil inlet hole of the balancing valve.

[0022] In a second aspect, an accumulator filling device is provided, comprising an accumulator filling integrated valve as described in any one of the above items, a filling pipeline and a variable pump, one end of the filling pipeline is connected to the oil inlet, and the other end is connected to the oil tank, and the variable pump is arranged in the filling pipeline;

[0023] A pump feedback port of the variable displacement pump is communicated with the feedback port.

[0024] As an optional solution of the accumulator filling device, the accumulator filling device further includes an overflow valve, which is arranged in the filling pipeline and located between the variable pump and the oil inlet.

[0025] According to a third aspect, a braking system is provided, comprising an accumulator filling device as described in any one of the above items and two accumulators, wherein the two accumulators are respectively connected to the two filling ports.

[0026] As an optional solution of the braking system, the braking system further comprises a pressure detection member arranged in one-to-one correspondence with the two accumulators, and the pressure detection member can detect the liquid pressure at the corresponding outlet of the accumulator.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] The accumulator charging integrated valve, accumulator charging device and brake system of the utility model, when charging is required, the oil pumped by the variable pump enters the oil inlet, so that the oil can flow through the balance valve and reach the two charging ports, so as to supply oil to the two accumulators respectively through the two charging ports; at the same time, the second oil outlet hole of the hydraulic pilot valve is controlled to be connected with the oil inlet hole of the hydraulic pilot valve, and the oil outlet hole of the solenoid valve is controlled to be connected with the second oil inlet hole of the solenoid valve. In other words, the feedback port is connected with the oil inlet by controlling the hydraulic pilot valve and the solenoid valve, and then the feedback port is connected with the oil inlet. The pilot oil is supplied from the feedback port to the pump feedback port of the variable pump, thereby controlling the variable pump to work continuously; when filling is not needed, the pressurized oil enters the hydraulic control end of the hydraulic control pilot valve to connect the second oil outlet hole of the hydraulic control pilot valve with the first oil outlet hole of the hydraulic control pilot valve. At this time, the oil outlet hole of the control solenoid valve is still connected with the second oil inlet hole of the solenoid valve. In other words, the hydraulic control pilot valve can connect the feedback port with the oil return port to unload the pilot oil supplied from the feedback port to the pump feedback port of the variable pump, thereby having an unloading function, thereby controlling the variable pump to stop working, thereby having an energy-saving effect.

[0029] In addition, when it is necessary to control the accumulator to stop filling, the solenoid valve can be energized to connect the oil outlet of the solenoid valve with the first oil inlet of the solenoid valve. In other words, the feedback port can be connected with the oil return port by controlling the solenoid valve, and the pilot oil provided by the feedback port to the pump feedback port of the variable pump can also be unloaded. This can not only achieve the purpose of controlling the variable pump to stop working, but also the solenoid valve has a fast response speed, which is beneficial to improve the response speed of the vehicle in cold environments or when the horsepower is insufficient, and the vehicle is easier to start. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the accumulator filling integrated valve in the embodiment of the utility model.

[0031] Reference numerals:

[0032] 1. Accumulator charging integrated valve; 11. Valve body; P. Oil inlet; A. Filling port; T. Oil return port; LS. Feedback port; SW. Pressure detection port; 111. Filling channel; 112. Oil return channel; 113. Connecting channel; 114. Feedback channel; 115. Detection channel; 12. Balance valve; 13. Hydraulic pilot valve; 13a. Pilot normal position; 13b. Pilot hydraulic control position; 131. Pilot elastic part; 132. First throttling structure; 133. Second throttling structure; 14. Solenoid valve; 14a. Feedback normal position; 14b. Feedback electric control position; 141. Reset elastic part; 15. Third throttling structure; 16. Check valve; 2. Filling pipeline; 3. Variable pump; 4. Oil tank; 5. Feedback pipeline; 6. Overflow valve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] like Figure 1 As shown, this embodiment provides an accumulator filling integrated valve, an accumulator filling device and a braking system. The braking system includes an accumulator filling device and two accumulators. The accumulator filling device includes an accumulator filling integrated valve 1, a filling pipeline 2 and a variable pump 3.

[0041] The accumulator charging integrated valve 1 comprises a valve body 11, a balancing valve 12, a hydraulically controlled pilot valve 13 and a solenoid valve 14. The balancing valve 12, the hydraulically controlled pilot valve 13 and the solenoid valve 14 are all arranged on the valve body 11. In other words, the balancing valve 12, the hydraulically controlled pilot valve 13 and the solenoid valve 14 are all integrated in the valve body 11, which not only has a more compact structure but also has a lower risk of leakage.

[0042] The valve body 11 includes an oil inlet P, two filling ports A, an oil return port T and a feedback port LS; one end of the filling pipeline 2 is connected to the oil inlet P, and the other end is connected to the oil tank 4. The variable pump 3 is arranged on the filling pipeline 2 to pump the oil in the oil tank 4 to the oil inlet P through the variable pump 3. The oil inlet hole of the balance valve 12 is connected to the oil inlet P, and the two oil outlet holes of the balance valve 12 are respectively connected to the two filling ports A; the two accumulators are respectively connected to the two filling ports A. In this embodiment, the liquid in the oil tank is oil. Of course, other hydraulic fluids can also be used in other embodiments, which are not limited here.

[0043] The solenoid valve 14 is located between the hydraulically controlled pilot valve 13 and the feedback port LS; the oil inlet of the hydraulically controlled pilot valve 13 and the hydraulically controlled end of the hydraulically controlled pilot valve 13 are both connected to the oil inlet P, the first oil outlet of the hydraulically controlled pilot valve 13 is connected to the oil return port T, the first oil inlet of the solenoid valve 14 is connected to the oil return port T, the second oil inlet of the solenoid valve 14 is connected to the second oil outlet of the hydraulically controlled pilot valve 13, the oil outlet of the solenoid valve 14 is connected to the feedback port LS, and the pump feedback port of the variable pump 3 is connected to the feedback port LS through the feedback pipeline 5. It can be understood that the displacement of the variable pump 3 can change according to the pressure signal received by the pump feedback port. In this embodiment, the displacement of the variable pump 3 can change according to the pressure of the feedback port LS; the second oil outlet of the hydraulically controlled pilot valve 13 can be connected to the oil inlet of the hydraulically controlled pilot valve 13 or the first oil outlet of the hydraulically controlled pilot valve 13; the oil outlet of the solenoid valve 14 can be connected to the second oil inlet of the solenoid valve 14 or the first oil inlet of the solenoid valve 14.

[0044] In this embodiment, when filling is required, the variable pump 3 is started and the oil in the oil tank 4 is pumped to the oil inlet P, so that the oil can flow through the balance valve 12 and reach the two filling ports A, so as to supply oil to the two accumulators through the two filling ports A respectively; at the same time, the second oil outlet of the hydraulic pilot valve 13 is controlled to be connected with the oil inlet of the hydraulic pilot valve 13, and the oil outlet of the solenoid valve 14 is controlled to be connected with the second oil inlet of the solenoid valve 14. In other words, the feedback port LS is connected with the oil inlet P by controlling the hydraulic pilot valve 13 and the solenoid valve 14 to supply oil to the variable pump 3 through the feedback port LS. The pump feedback port is provided with pilot oil, thereby controlling the variable pump 3 to work continuously; when filling is not needed, the pressurized oil enters the hydraulic control end of the hydraulic control pilot valve 13 to connect the second oil outlet of the hydraulic control pilot valve 13 with the first oil outlet of the hydraulic control pilot valve 13, and at this time, the oil outlet of the control solenoid valve 14 is still connected with the second oil inlet of the solenoid valve 14. In other words, the hydraulic control pilot valve 13 can connect the feedback port LS with the oil return port T to unload the pilot oil provided by the feedback port LS to the pump feedback port of the variable pump 3, and has an unloading function, thereby controlling the variable pump 3 to stop working, which has an energy-saving effect.

[0045] In addition, when it is necessary to control the accumulator to stop filling, the solenoid valve 14 can be energized to connect the oil outlet of the solenoid valve 14 with the first oil inlet of the solenoid valve 14. In other words, the feedback port LS can be connected with the oil return port T by controlling the solenoid valve 14, and the pilot oil provided by the feedback port LS to the pump feedback port of the variable pump 3 can also be unloaded. Not only can the purpose of controlling the variable pump 3 to stop working be achieved, but the solenoid valve 14 has a fast response speed, which is beneficial to improve the response speed of the vehicle in cold environments or when the horsepower is insufficient, and the vehicle is easier to start.

[0046] It should be noted that the hydraulically controlled pilot valve 13 includes a pilot valve core and a pilot elastic member 131. The pilot valve core includes a pilot normal position 13a and a pilot hydraulic control position 13b. The pilot valve core can be slidably arranged on the valve body 11 to switch between the pilot normal position 13a and the pilot hydraulic control position 13b. When the pilot valve core is in the pilot normal position 13a, the second oil outlet hole of the hydraulically controlled pilot valve 13 is connected to the oil inlet hole of the hydraulically controlled pilot valve 13; when the pilot valve core is in the pilot hydraulic control position 13b, the second oil outlet hole of the hydraulically controlled pilot valve 13 is connected to the first oil outlet hole of the hydraulically controlled pilot valve 13. The pilot elastic member 131 can make the pilot valve core always have a movement tendency to move from the pilot hydraulic control position 13b to the pilot normal position 13a, and the pressure oil enters the hydraulic control end of the hydraulic pilot valve 13 and drives the pilot valve core to move from the pilot normal position 13a to the pilot hydraulic control position 13b, so that the pilot valve core switches to the pilot hydraulic control position 13b. Exemplarily, the pilot elastic member 131 is a spring.

[0047] Further, the solenoid valve 14 includes an electric control valve core and a reset elastic member 141. The electric control valve core includes a feedback normal position 14a and a feedback electric control position 14b. The electric control valve core can be slidably arranged on the valve body 11 to switch between the feedback normal position 14a and the feedback electric control position 14b. When the electric control valve core is in the feedback normal position 14a, the oil outlet of the solenoid valve 14 is connected to the second oil inlet of the solenoid valve 14; when the electric control valve core is in the feedback electric control position 14b, the oil outlet of the solenoid valve 14 is connected to the first oil inlet of the solenoid valve 14. The reset elastic member 141 can make the electric control valve core always have a movement trend of moving from the feedback electric control position 14b to the feedback normal position 14a; when the solenoid valve 14 is powered on, the electric control valve core can move from the feedback normal position 14a to the feedback electric control position 14b under the action of magnetic force to switch to the feedback electric control position 14b. Exemplarily, the reset elastic member 141 is a spring.

[0048] In this embodiment, the variable pump 3 is a load sensing pump, and the pump feedback port is the load sensing port. Such a setting not only has a better energy-saving effect, but also the load sensing function of the load sensing pump and the unloading function of the accumulator charging integrated valve 1 can make the vehicle easier to start in a cold environment or when the horsepower is insufficient.

[0049] Optionally, the balancing valve 12 is a low-pressure priority balancing valve. It should be noted that when the pressure of the hydraulic oil in the two accumulators is the same (for example, the outlet pressure of the accumulator can be used as the pressure of the hydraulic oil in the accumulator), the low-pressure priority balancing valve can supply oil to the two accumulators at the same time; when the pressure of the hydraulic oil in the two accumulators is different, the low-pressure priority balancing valve can supply oil to the accumulator with lower pressure according to the pressure of the hydraulic oil in the two accumulators. The structure and working principle of the low-pressure priority balancing valve are prior art in the field and will not be described in detail here.

[0050] Optionally, a first throttling structure 132 is provided between the second oil outlet of the hydraulic pilot valve 13 and the oil inlet of the hydraulic pilot valve 13. This arrangement can not only transmit the pilot signal through the pilot oil, but also reduce the energy consumption of the variable pump 3, and has a good energy-saving effect.

[0051] Optionally, a second throttling structure 133 is provided between the second oil outlet of the hydraulic pilot valve 13 and the first oil outlet of the hydraulic pilot valve 13. This arrangement can prevent the oil between the second oil outlet of the hydraulic pilot valve 13 and the feedback port LS from quickly flowing back to the oil tank 4, which is conducive to improving the filling response speed.

[0052] Exemplarily, both the first throttling structure 132 and the second throttling structure 133 may adopt existing throttling structures such as throttle valves or throttle plates.

[0053] Optionally, the valve body 11 further includes a pressure detection port SW, which is connected to the oil inlet of the balancing valve 12. In this configuration, the oil pressure at the oil inlet of the balancing valve 12 can be quickly obtained by simply detecting the oil pressure at the pressure detection port SW using a pressure detector, so as to quickly understand whether there is any abnormality in the accumulator charging device.

[0054] For example, by connecting the pressure detection port SW to the low-pressure alarm switch, when the oil pressure at the oil inlet hole of the balancing valve 12 is low, the low-pressure alarm switch can promptly remind the user that there may be an abnormality in the accumulator filling device, which is convenient for maintenance and safer.

[0055] In this embodiment, the valve body 11 also includes a liquid filling channel 111, one end of which is connected to the oil inlet P, and the other end is respectively connected to the oil inlet hole of the balancing valve 12, the oil inlet hole of the hydraulically controlled pilot valve 13 and the hydraulic control end of the hydraulically controlled pilot valve 13.

[0056] Furthermore, the valve body 11 further includes an oil return channel 112 , one end of which is connected to the oil return port T, and the other end of which is respectively connected to the first oil outlet of the hydraulic pilot valve 13 and the first oil inlet of the solenoid valve 14 .

[0057] Furthermore, the valve body 11 further includes a connecting channel 113 , one end of which is connected to the second oil outlet of the hydraulically controlled pilot valve 13 , and the other end of which is connected to the second oil inlet of the solenoid valve 14 .

[0058] Optionally, the valve body 11 further includes a feedback channel 114 , one end of which is connected to the oil outlet of the solenoid valve 14 , and the other end of which is connected to the feedback port LS.

[0059] Optionally, the valve body 11 further includes a detection channel 115 , one end of which is communicated with the oil inlet hole of the balancing valve 12 , and the other end of which is communicated with the pressure detection port SW.

[0060] The filling channel 111, the oil return channel 112, the connecting channel 113, the feedback channel 114 and the detection channel 115 are directly opened in the valve body 11, which not only facilitates the layout of the accumulator filling integrated valve 1, making the accumulator filling integrated valve 1 more compact, but also reduces the risk of leakage.

[0061] Optionally, the accumulator charging integrated valve 1 further includes a third throttling structure 15 and a one-way valve 16, which are sequentially arranged in the charging channel 111 along the oil flow direction in the charging channel 111, and the one-way valve 16 only allows the oil in the charging channel 111 to flow from the oil inlet P to the balancing valve 12, thereby preventing the oil from flowing back. Such an arrangement can achieve the purpose of throttling speed regulation. Exemplarily, the third throttling structure 15 can adopt an existing throttling structure such as a throttling valve or a throttling plate.

[0062] Optionally, the accumulator charging device also includes an overflow valve 6, which is arranged in the charging pipeline 2 and located between the variable pump 3 and the oil inlet P, so as to realize a high-pressure overflow function through the overflow valve 6, thereby protecting various components of the accumulator charging device.

[0063] Optionally, the brake system further includes a brake controller and a pressure detection component corresponding to the two accumulators, the pressure detection component can detect the oil pressure at the outlet of the corresponding accumulator, and the brake controller can control the start and stop of the variable pump 3 according to the detection result of the pressure detection component, and control the opening and closing of the balance valve 12, the hydraulic pilot valve 13 and the solenoid valve 14. Exemplarily, the pressure detection component is a pressure sensor.

[0064] Exemplarily, the working principle of the accumulator charging device of this embodiment is:

[0065] When the outlet pressure of the accumulator is less than or equal to the preset lower limit pressure (the preset lower limit pressure is an empirical value, and the preset lower limit pressure is set by the spring of the hydraulic pilot valve 13), the balance valve 12 is opened, and the oil pumped by the load sensing pump enters the filling channel 111 from the oil inlet P, and flows through the third throttling structure 15, the one-way valve 16 and the balance valve 12, and then supplies oil to the two accumulators through the two filling ports A. At the same time, the pilot valve core of the hydraulic pilot valve 13 is in the pilot normal position 13a, and the electric control valve core of the solenoid valve 14 is in the feedback normal position 14a. After the oil flows through the hydraulic pilot valve 13 and the solenoid valve 14, it provides pilot oil to the pump feedback port of the load sensing pump through the feedback port LS. In other words, since the accumulator needs to be continuously filled with liquid, a pilot signal is fed back to the load sensing pump through the feedback port LS to keep the load sensing pump running continuously.

[0066] When the outlet pressure of the accumulator is greater than or equal to the preset upper limit pressure (the preset upper limit pressure is an empirical value, and the preset upper limit pressure is set by the spring of the hydraulic pilot valve 13), the balance valve 12 is closed, and the accumulator stops filling and maintains pressure. At the same time, the pressurized oil enters the hydraulic control end of the hydraulic pilot valve 13 and drives the pilot valve core to move from the pilot normal position 13a to the pilot hydraulic control position 13b and squeeze the pilot elastic member 131, so that the pilot valve core switches to the pilot hydraulic control position 13b, and then the feedback port LS is connected to the return oil port T, so as to unload the pilot oil provided by the feedback port LS to the pump feedback port of the variable pump 3, and then control the variable pump 3 to stop working. In addition, when the accumulator needs to stop filling, the solenoid valve 14 can be energized so that the electronically controlled valve core can move from the feedback normal position 14a to the feedback electronically controlled position 14b under the action of the electromagnetic force to switch to the feedback electronically controlled position 14b. The feedback port LS can also be connected to the oil return port T to unload the pilot oil provided by the feedback port LS to the pump feedback port of the variable pump 3. Similarly, the variable pump 3 can be controlled to stop working to stop filling the accumulator.

[0067] After the brake system has been braked for many times, the oil in the accumulator is reduced, thereby reducing the outlet pressure of the accumulator. At this time, the oil pressure at the hydraulic end of the hydraulic pilot valve 13 will also decrease until the oil pressure at the hydraulic end of the hydraulic pilot valve 13 is less than the elastic force of the pilot elastic member 131, and then the pilot valve core of the hydraulic pilot valve 13 is reset to the pilot normal position 13a. At the same time, after the oil flows through the solenoid valve 14, the pilot signal is fed back to the load sensing pump through the feedback port LS, so that the load sensing pump continues to run, and the oil in the oil tank 4 is pumped to the oil inlet P, so that the accumulator filling integrated valve 1 supplies oil to the two accumulators through the two filling ports A respectively. In this cycle, the accumulator can be filled and pressure maintained.

[0068] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Accumulator charging integrated valve, characterized in that: include: A valve body (11), the valve body (11) comprising an oil inlet (P), two liquid filling ports (A), an oil return port (T) and a feedback port (LS); A balancing valve (12), the balancing valve (12) being arranged on the valve body (11), the oil inlet hole of the balancing valve (12) being in communication with the oil inlet port (P), and the two oil outlet holes of the balancing valve (12) being in communication with the two liquid filling ports (A) respectively; A hydraulically controlled pilot valve (13) and a solenoid valve (14), wherein the hydraulically controlled pilot valve (13) and the solenoid valve (14) are both arranged on the valve body (11), the solenoid valve (14) is located between the hydraulically controlled pilot valve (13) and the feedback port (LS), the oil inlet hole of the hydraulically controlled pilot valve (13) and the hydraulically controlled end of the hydraulically controlled pilot valve (13) are both in communication with the oil inlet port (P), the first oil outlet hole of the hydraulically controlled pilot valve (13) is in communication with the oil return port (T), the first oil inlet hole of the solenoid valve (14) is in communication with the oil return port (T), the second oil inlet hole of the solenoid valve (14) is in communication with the second oil outlet hole of the hydraulically controlled pilot valve (13), the oil outlet hole of the solenoid valve (14) is in communication with the feedback port (LS), and the feedback port (LS) is used to be in communication with a pump feedback port of a variable displacement pump (3); The second oil outlet hole of the hydraulically controlled pilot valve (13) can be communicated with the oil inlet hole of the hydraulically controlled pilot valve (13) or the first oil outlet hole of the hydraulically controlled pilot valve (13); The oil outlet hole of the solenoid valve (14) can be in communication with the second oil inlet hole of the solenoid valve (14) or the first oil inlet hole of the solenoid valve (14).

2. The accumulator charging integrated valve according to claim 1, characterized in that: The balancing valve (12) is a low-pressure priority balancing valve (12).

3. The accumulator charging integrated valve according to claim 1, characterized in that: A first throttling structure (132) is provided between the second oil outlet hole of the hydraulically controlled pilot valve (13) and the oil inlet hole of the hydraulically controlled pilot valve (13); and / or, A second throttling structure (133) is provided between the second oil outlet hole of the hydraulically controlled pilot valve (13) and the first oil outlet hole of the hydraulically controlled pilot valve (13).

4. The accumulator charging integrated valve according to claim 1, characterized in that: The valve body (11) further comprises a liquid filling channel (111), one end of the liquid filling channel (111) being connected to the oil inlet (P), and the other end of the liquid filling channel (111) being respectively connected to the oil inlet hole of the balancing valve (12), the oil inlet hole of the hydraulically controlled pilot valve (13) and the hydraulically controlled end of the hydraulically controlled pilot valve (13); and / or, The valve body (11) further comprises an oil return passage (112), one end of the oil return passage (112) being connected to the oil return port (T), and the other end of the oil return passage (112) being respectively connected to a first oil outlet hole of the hydraulically controlled pilot valve (13) and a first oil inlet hole of the solenoid valve (14); and / or, The valve body (11) further comprises a connecting channel (113), one end of which is connected to the second oil outlet hole of the hydraulically controlled pilot valve (13), and the other end of which is connected to the second oil inlet hole of the solenoid valve (14).

5. The accumulator charging integrated valve according to claim 4, characterized in that: The accumulator charging integrated valve (1) further comprises a third throttling structure (15), wherein the third throttling structure (15) is arranged in the charging channel (111); and / or, The accumulator charging integrated valve (1) further comprises a one-way valve (16), wherein the one-way valve (16) is arranged in the charging channel (111).

6. The accumulator charging integrated valve according to claim 1, characterized in that: The valve body (11) further comprises a pressure detection port (SW), and the pressure detection port (SW) is communicated with the oil inlet hole of the balancing valve (12).

7. Accumulator filling device, characterized in that: The accumulator comprises an accumulator charging integrated valve (1) as claimed in any one of claims 1 to 6, a charging pipeline (2) and a variable pump (3), wherein one end of the charging pipeline (2) is connected to the oil inlet (P), and the other end is connected to the oil tank (4), and the variable pump (3) is arranged on the charging pipeline (2); The pump feedback port of the variable displacement pump (3) is in communication with the feedback port (LS).

8. The accumulator charging device according to claim 7, characterized in that: The accumulator charging device further comprises an overflow valve (6), wherein the overflow valve (6) is arranged in the charging pipeline (2) and is located between the variable pump (3) and the oil inlet (P).

9. A braking system, characterized in that: It comprises the accumulator filling device as claimed in claim 7 or 8 and two accumulators, wherein the two accumulators are respectively connected to the two filling ports (A).

10. The braking system according to claim 9, characterized in that: The brake system further comprises a pressure detection member arranged in one-to-one correspondence with the two accumulators, and the pressure detection member can detect the liquid pressure at the corresponding outlet of the accumulator.

Images