Active hydraulic actuating system and damping device with same

Abstract

The invention relates to the technical field of hydraulic systems, and provides an active hydraulic actuating system and a damping device with the active hydraulic actuating system. The active hydraulic actuating system comprises a hydraulic cylinder, a communicating oil way, an energy accumulator and a bidirectional hydraulic pump, the hydraulic cylinder is provided with a rod cavity and a rodless cavity, the rod cavity is connected with a recovery valve system, a first access section is arranged between the rod cavity and the recovery valve system, the rodless cavity is connected with a compression valve system, and a second access section is arranged between the rodless cavity and the compression valve system; the communicating oil way is connected to the ends, away from the hydraulic cylinder, of the rebuilt valve system and the compression valve system. The energy accumulator is connected to the communicating oil way and divides the communicating oil way into a third connecting-in section and a fourth connecting-in section. The two ends of the bidirectional hydraulic pump can be connected to the first connecting-in section and the second connecting-in section correspondingly. Or the two ends of the two-way hydraulic pump can be connected to the third connecting-in section and the fourth connecting-in section correspondingly. According to the active hydraulic actuation system, it is guaranteed that oil passing through the hydraulic pump fully acts on the hydraulic cylinder as much as possible while active hydraulic control is met, and the response speed and the system efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic systems, and in particular to an active hydraulic actuation system and a vibration reduction device having the same. Background Art

[0002] Active hydraulic actuation systems are widely used in automobile suspension, construction machinery actuation mechanisms, robot motion mechanisms, etc. They mainly provide actuation force and reduce speed impact, thereby improving equipment service life and operating comfort. In active hydraulic actuation systems, hydraulic pumps are usually used to provide active actuation force.

[0003] In the related art, in order to reduce the automatic rotation speed of the hydraulic pump under pressure, the hydraulic pump is usually connected in series with the valve system, and the pressure difference at both ends of the hydraulic pump is suppressed by the one-way flow characteristics and throttling effect of the valve system. At the same time, an accumulator needs to be set in the entire hydraulic actuation system, which can not only meet the recovery of part of the oil energy, but also meet the timely response under high damping conditions. However, in actual use, it is found that the oil flowing through the hydraulic pump is more likely to flow to the accumulator, which loses the amount of oil flowing from the hydraulic pump to the hydraulic cylinder, resulting in a loss of efficiency and response speed of the entire hydraulic actuation system. Summary of the invention

[0004] Based on this, it is necessary to provide an active hydraulic actuation system that can meet the requirements of active hydraulic control while ensuring that the oil actively controlled by the hydraulic pump can fully act on the hydraulic cylinder, thereby improving the response speed and system efficiency.

[0005] An active hydraulic actuation system, comprising a hydraulic cylinder, a connecting oil circuit, an accumulator and a bidirectional hydraulic pump; the hydraulic cylinder has a rod chamber and a rodless chamber, the rod chamber is connected to a restoring valve system and a first access section is provided between the two, the rodless chamber is connected to a compression valve system and a second access section is provided between the two; the connecting oil circuit is connected to the restoring valve system and the compression valve system at one end away from the hydraulic cylinder; the accumulator is connected to the connecting oil circuit and divides the connecting oil circuit into a third access section and a fourth access section; Wherein, both ends of the bidirectional hydraulic pump can be connected to the first access section and the second access section respectively; or, both ends of the bidirectional hydraulic pump can be connected to the third access section and the fourth access section respectively.

[0006] It can be understood that when the bidirectional hydraulic pump is connected to the first access section and the second access section, the bidirectional hydraulic pump can be directly connected to the hydraulic cylinder for active control of the hydraulic cylinder; and, such a setting reduces the oil flow path between the bidirectional hydraulic pump and the hydraulic cylinder, and also reduces the oil flow resistance between the bidirectional hydraulic pump and the hydraulic cylinder, which is conducive to the oil flowing out of the bidirectional hydraulic pump to flow directly and fully to the hydraulic cylinder, satisfying the sufficient oil supply of the hydraulic cylinder, and improving the actuation efficiency and response timeliness. When the bidirectional hydraulic pump is connected to the third access section and the fourth access section, the bidirectional hydraulic pump is connected to the two cavities of the hydraulic cylinder through the recovery valve system and the compression valve system; and, such a setting is equivalent to setting the bidirectional hydraulic pump and the accumulator in parallel, and the oil flowing through the bidirectional hydraulic pump does not have to pass through the accumulator before it can flow to the hydraulic cylinder. In other words, the active hydraulic actuation system provided by the present application can ensure that the oil flowing through the bidirectional hydraulic pump can flow to the hydraulic cylinder without passing through the accumulator, reduce the amount of oil flowing directly to the accumulator through the bidirectional hydraulic pump, and improve the efficiency and response speed of the active hydraulic actuation system when providing active control based on the bidirectional hydraulic pump.

[0007] In some embodiments, the first access section and the second access section serve as the first access position of the bidirectional hydraulic pump, and the third access section and the fourth access section serve as the second access position of the bidirectional hydraulic pump; in the first access position, the hydraulic pump is connected to the hydraulic cylinder to form a first oil circuit, and the hydraulic cylinder is connected to the connecting oil circuit through the restoring valve system and the compression valve system to form a second oil circuit, and the first oil circuit and the second oil circuit are connected in parallel and can be opened one by one; in the second access position, the hydraulic cylinder is connected to the hydraulic pump through the restoring valve system and the compression valve system to form a third oil circuit, and the hydraulic cylinder is connected to the connecting oil circuit through the restoring valve system and the compression valve system to form a fourth oil circuit, and the third oil circuit and the fourth oil circuit are connected in parallel and can be opened one by one.

[0008] In some embodiments, the active hydraulic actuation system includes a first reversing valve, which is arranged at the first access position and has port A, port B and port C, and port A and port B can be selectively connected to port C; wherein, one of port A and port B is connected to the bidirectional hydraulic pump, and the other is connected to the restoring valve system or the compression valve system, and port C is connected to the rod chamber or the rodless chamber.

[0009] In some embodiments, the active hydraulic actuation system further includes a bypass oil circuit, one end of which is connected between the bidirectional hydraulic pump and the first reversing valve, and the other end of which is connected to the compression valve system or the recovery valve system.

[0010] In some embodiments, the compression valve system and the recovery valve system both include a first control valve and a flow valve, which are connected in parallel, and the other end of the bypass oil circuit is connected between the first control valve and the first reversing valve.

[0011] In some embodiments, the compression valve system and the recovery valve system both include a first control valve, and the first control valves are connected in series through the connecting oil path.

[0012] In some embodiments, one of the first access section and the second access section is provided with the first reversing valve; the compression valve system and the recovery valve system both include a damping valve, and one of them includes a circulation valve, the circulation valve is connected in parallel with the corresponding damping valve and has an opposite flow direction, and the damping valve corresponding to the other is connected in series with the circulation valve through the connecting oil circuit, and the other end of the damping valve corresponding to the circulation valve is connected to the side of the other damping valve away from the connecting oil circuit.

[0013] In some embodiments, the compression valve system and / or the recovery valve system includes at least a first control valve, which is connected in series with the connecting oil circuit; the first drive oil circuit also includes a second control valve connected in series with the bidirectional hydraulic pump; the first control valve and the second control valve can be opened selectively to switch the first drive oil circuit and the second drive oil circuit to be opened selectively.

[0014] In some embodiments, the compression valve system and the restoration valve system both include a first control valve; the compression valve system and the restoration valve system both include a flow valve, and each of the flow valves is arranged in parallel with its corresponding first control valve; the flow valve of the compression valve system is used to guide the oil from the rod chamber to the rodless chamber, and the flow valve of the restoration valve system is used to guide the oil from the rodless chamber to the rod chamber.

[0015] In some embodiments, the compression valve system and / or the restoration valve system also includes a damping valve, which is arranged in parallel with the corresponding first control valve and the flow valve, and the flow direction of the damping valve is opposite to that of the corresponding flow valve; the damping valve of the compression valve system is used to guide the oil to flow from the rodless chamber to the rod chamber, and the damping valve of the restoration valve system is used to guide the oil to flow from the rod chamber to the rodless chamber.

[0016] In some embodiments, the compression valve system and / or the recovery valve system further comprises a bypass valve, and the bypass valve is arranged in parallel with the corresponding first control valve, the flow valve and the damping valve.

[0017] In some embodiments, one of the compression valve system and the restoration valve system includes a first control valve, and the other includes a circulation valve, and the first control valve and the circulation valve are connected in series through the connecting oil circuit; the compression valve system and the restoration valve system also include a damping valve; the first control valve and the circulation valve are both connected in series with one of the damping valves, one end of the other damping valve is connected to the side of the circulation valve away from the first control valve, and the other end is connected between the first control valve and one of the damping valves.

[0018] In some embodiments, the active hydraulic actuation system also includes a second reversing valve, which is arranged at the second access position and has a port D, a port E and a port F, and the port D and the port E can be selectively connected to the port F; wherein, one of the port D and the port E is connected to the bidirectional hydraulic pump, and the other is connected to the connecting oil circuit, and the port F is connected to the restoration valve system or the compression valve system.

[0019] In some of the embodiments, the active hydraulic actuation system further includes a third control valve, and the third control valve is disposed between the accumulator and the communicating oil passage.

[0020] The present application also provides a vibration reduction device, comprising the above-mentioned active hydraulic actuation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A first schematic diagram of a bidirectional hydraulic pump connected to a first connection position in the active hydraulic actuation system provided by the present application; Figure 2 A first schematic diagram of a bidirectional hydraulic pump connected to a second connection position in the active hydraulic actuation system provided by the present application; Figure 3 A second schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Figure 4 A third schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Figure 5 A fourth schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Figure 6A fifth schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Figure 7 A sixth schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Figure 8 A seventh schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Fig. 9 An eighth schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Fig.10 A ninth schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Fig.11 A tenth schematic diagram of a bidirectional hydraulic pump in an active hydraulic actuation system provided by the present application being connected to a first connection position; Fig.12 An eleventh schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Fig.13 A second schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the second connection position; Fig.14 A twelfth schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided by the present application being connected to the first connection position; Fig.15 A thirteenth schematic diagram of the bidirectional hydraulic pump connected to the first connection position in the active hydraulic actuation system provided by the present application; Fig.16 This is the fourteenth schematic diagram of the bidirectional hydraulic pump in the active hydraulic actuation system provided in the present application being connected to the first connection position.

[0023] Figure numerals: 10, hydraulic cylinder; 11, cylinder body; 12, piston; 13, piston rod; 20, connecting oil circuit; 30, accumulator; 31, third control valve; 40, two-way hydraulic pump; 50, first reversing valve; 60, bypass oil circuit; 61, bypass throttle valve; 70, second reversing valve; 80, second control valve; 91, filter; 92, stop valve; 93, fuel filler port hydraulic lock; 94, pressure sensor; 95, charging valve; 101, rod chamber; 102, rodless chamber; 110, recovery valve system; 120, compression valve system; 121, first A piston one-way valve; 122, a second piston one-way valve; 123, a second throttle valve; 130, a first control valve; 131, a recovery control valve; 132, a compression control valve; 140, a circulation valve; 141, a recovery circulation valve; 142, a compression circulation valve; 150, a damping valve; 151, a recovery damping valve; 152, a compression damping valve; 160, a bypass valve; 161, a recovery bypass valve; 162, a compression bypass valve; 1001, a first access section; 1002, a second access section; 1003, a third access section; 1004, a fourth access section. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0026] 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 this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in 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.

[0028] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0029] See also Figure 1 and Figure 2 An embodiment of the present application provides an active hydraulic actuation system, including a hydraulic cylinder 10, a connecting oil circuit 20, an accumulator 30 and a bidirectional hydraulic pump 40. The hydraulic cylinder 10 has a rod chamber 101 and a rodless chamber 102, the rod chamber 101 is connected to a restoring valve system 110 and a first access section 1001 is provided between the two, and the rodless chamber 102 is connected to a compression valve system 120 and a second access section 1002 is provided between the two. The connecting oil circuit is connected to the end of the restoring valve system 110 and the compression valve system 120 away from the hydraulic cylinder 10. The accumulator 30 is connected to the connecting oil circuit 20 and divides the connecting oil circuit 20 into a third access section 1003 and a fourth access section 1004. The two ends of the bidirectional hydraulic pump 40 can be connected to the first access section 1001 and the second access section 1002 respectively. Alternatively, the two ends of the bidirectional hydraulic pump 40 can be connected to the third access section 1003 and the fourth access section 1004 respectively.

[0030] That is to say, when the bidirectional hydraulic pump 40 is connected to the first access section 1001 and the second access section 1002, the bidirectional hydraulic pump 40 can be directly connected to the hydraulic cylinder 10 for active control of the hydraulic cylinder 10. Such a setting reduces the oil flow path between the bidirectional hydraulic pump 40 and the hydraulic cylinder 10, and also reduces the oil flow resistance between the bidirectional hydraulic pump 40 and the hydraulic cylinder 10; and, since the restoring valve system 110 and the compression valve system 120 are equivalent to being connected between the bidirectional hydraulic pump 40 and the accumulator 30 at this time, the oil flow resistance between the bidirectional hydraulic pump 40 and the accumulator 30 is significantly greater than the oil flow resistance between the bidirectional hydraulic pump 40 and the hydraulic cylinder 10, which is conducive to the oil flowing out of the bidirectional hydraulic pump 40 to flow directly and fully to the hydraulic cylinder 10, meet the sufficient oil supply of the hydraulic cylinder 10, and improve the actuation efficiency and response timeliness. When the bidirectional hydraulic pump 40 is connected to the third access section 1003 and the fourth access section 1004, the bidirectional hydraulic pump 40 is connected to the two chambers of the hydraulic cylinder 10 through the restoring valve system 110 and the compression valve system 120; and, such a setting is equivalent to setting the bidirectional hydraulic pump 40 and the accumulator 30 in parallel, and the oil flowing through the bidirectional hydraulic pump 40 does not have to pass through the accumulator 30 before it can flow to the hydraulic cylinder 10.

[0031] Therefore, in the active hydraulic actuation system provided in this embodiment, it can be ensured that the oil flowing through the bidirectional hydraulic pump 40 can flow to the hydraulic cylinder 10 without passing through the accumulator 30, reducing the amount of oil flowing directly to the accumulator 30 through the bidirectional hydraulic pump 40, and improving the efficiency and response speed of the active hydraulic actuation system when providing active control based on the bidirectional hydraulic pump 40. In addition, such a setting can satisfy the bidirectional hydraulic pump 40 and the accumulator 30 to perform active hydraulic control on the hydraulic cylinder 10 respectively, thereby increasing the adjustment range. When the accumulator 30 is connected to the rodless chamber 102 and the rod chamber 101 through the restoring valve system 110 and the compression valve system 120, the corresponding damping adjustment working condition can be met. If the corresponding load increases, it can be switched to the bidirectional hydraulic pump 40 to communicate with the hydraulic cylinder 10 to achieve damping adjustment; and the corresponding oil volume and flow rate can be adjusted by controlling the power of the bidirectional hydraulic pump 40.

[0032] The hydraulic cylinder 10 includes a cylinder body 11, a piston 12 and a piston rod 13. The cylinder body 11 has a cavity. The piston 12 is disposed in the cavity and is slidably connected to the cylinder body 11. The movable rod is connected to one side of the piston 12 to separate the cavity into a rodless cavity 102 and a rod cavity 101. The piston rod 13 is used to connect a load.

[0033] Please continue reading Figure 1 and Figure 2In some embodiments, the first access section 1001 and the second access section 1002 can be used together as the first access position of the bidirectional hydraulic pump 40, and the third access section 1003 and the fourth access section 1004 can be used together as the second access position of the bidirectional hydraulic pump 40.

[0034] Among them, when the bidirectional hydraulic pump 40 is connected to the first access position, the hydraulic pump and the hydraulic cylinder 10 are connected to form a first oil circuit, and the hydraulic cylinder 10 is connected to the accumulator 30 through the restoring valve system 110 and the compression valve system 120 to form a second oil circuit. The first oil circuit and the second oil circuit are connected in parallel and can be opened one by one. When it is needed for a large load, the second oil circuit can be closed, the first oil circuit can be opened, and the hydraulic pump can be directly used to act on the hydraulic cylinder 10 to meet the timely response of the oil. When a smaller load is needed, the first oil circuit can be closed, the second oil circuit can be opened, and the accumulator 30 can be connected to the hydraulic cylinder 10 to meet the timely response of the oil.

[0035] Further, when the bidirectional hydraulic pump 40 is connected to the second access position, the hydraulic cylinder 10 is connected to the hydraulic pump through the restoring valve system 110 and the compression valve system 120 to form a third oil circuit; and the hydraulic cylinder 10 is connected to the accumulator 30 through the restoring valve system 110 and the compression valve system 120 to form a fourth oil circuit, and the third oil circuit and the fourth oil circuit are connected in parallel and can be opened selectively. In this embodiment, the bidirectional hydraulic pump 40 and the accumulator 30 can also be selected to be connected to the hydraulic cylinder 10 to meet the timely response of the hydraulic cylinder 10.

[0036] The following description is made by taking the bidirectional hydraulic pump 40 connected to the first access position as an example.

[0037] See also Figures 3 to 7 Exemplarily, the active hydraulic actuation system further includes a first reversing valve 50, which is arranged at a first access position. For example, the first reversing valve 50 can be connected to the first access section 1001, or to the second access section 1002, or the first reversing valve 50 is connected to both the first access section 1001 and the second access section 1002. The first reversing valve 50 has a port A, a port B, and a port C, and either the port A or the port B can be connected to the port C. In other words, the first reversing valve 50 can be a three-way valve. Among them, one of the ports A and B is connected to the bidirectional hydraulic pump 40, and the other is connected to the recovery valve system 110 or the compression valve system 120, and the port C is connected to the rod chamber 101 or the rodless chamber 102.

[0038] That is to say, by using the setting of the first reversing valve 50, it is possible to adjust whether the oil flowing out through the rodless chamber 102 and the rod chamber 101 flows to the compression valve system 120, the recovery valve system 110, or directly flows to the two-way hydraulic pump 40, so as to realize the switching of the first oil circuit and the second oil circuit. For example, the first reversing valve 50 is provided in the first access section 1001. At this time, the port A of the first reversing valve 50 is connected to the two-way hydraulic pump 40, the port B is connected to the recovery valve system 110, and the port C is connected to the rod chamber 101. The valve core of the reversing valve has a left position and a right position. When the valve core moves to the left position, the port C is connected to the port A, and the rod chamber 101 is connected to the two-way hydraulic pump 40 via the port C and the port A of the first reversing valve 50, so that the two ends of the two-way hydraulic pump 40 can be directly connected to the rod chamber 101 and the rodless chamber 102 of the hydraulic cylinder 10; that is, the first oil circuit is opened. When the valve core moves to the right position, port C is connected to port B, and the rod chamber 101 is connected to the restoring valve system 110 via port C and port B of the first reversing valve 50, and the restoring valve system 110 is connected to the rodless chamber 102 via the connecting oil circuit 20 and the compression valve system 120; that is, the second oil circuit is opened.

[0039] When the first oil circuit is opened, if the piston 12 moves toward the rodless chamber 102 under the action of the load to squeeze the oil out of the rodless chamber 102, the oil can flow to the rod chamber 101 through the port A and the port C under the action of the two-way hydraulic pump 40; conversely, if the piston 12 moves toward the rod chamber 101, the oil in the rod chamber 101 is pressurized and flows through the port C and the port A to the two-way hydraulic pump 40, and then flows to the rodless chamber 102.

[0040] When the second oil circuit is opened, if the piston 12 moves toward the rodless chamber 102, the oil in the rodless chamber 102 flows to the compression valve system 120, flows to the port B via the connecting oil circuit 20, and flows to the rod chamber 101 via the port C. When the accumulator 30 adopts a low-pressure accumulator 30, more oil in the rodless chamber 102 can flow to the accumulator 30 for oil storage. When the accumulator 30 adopts a high-pressure accumulator 30, high-pressure oil can be provided for the rodless chamber 102 and the rod chamber 101.

[0041] In other embodiments, the first reversing valve 50 is disposed in the second access section 1002 , the port A is connected to the bidirectional hydraulic pump 40 , the port B is connected to the compression valve system 120 , and the port C is connected to the rodless chamber 102 .

[0042] like Figures 3 to 6As shown, in actual use, the restoration valve system 110 and the compression valve system 120 both include a first control valve 130, with the restoration valve system 110 corresponding to the restoration control valve 131, and the compression valve system 120 corresponding to the compression control valve 132. The restoration control valve 131 and the compression control valve 132 are connected in series through the connecting oil circuit 20, and the accumulator 30 is connected to the connecting oil circuit 20. When the first reversing valve 50 is switched to the right position, prompting the second oil circuit to open, the restoration control valve 131 and the compression control valve 132 are both opened. The restoration control valve 131 and the compression control valve 132 can adjust the flow rate, for example, a variable throttle valve can be used.

[0043] like Figures 3 to 5 As shown, further, the restoration valve system 110 and the compression valve system 120 also include a circulation valve 140, and each circulation valve 140 is arranged in parallel with the corresponding first control valve 130. The restoration valve system 110 corresponds to the restoration circulation valve 141, and the compression valve system 120 corresponds to the compression circulation valve 142. The restoration circulation valve 141 is used to guide the oil from the connecting oil path 20 to the rod chamber 101, and the compression circulation valve 142 is used to guide the oil from the connecting oil path 20 to the rodless chamber 102. By setting the restoration circulation valve 141 and the compression circulation valve 142, the corresponding restoration control valve 131 and the compression control valve 132 can be divided into pressures, and the response speed can be further improved.

[0044] Please continue reading Figures 3 to 5 Furthermore, the restoring valve system 110 and the compression valve system 120 also include a damping valve 150. Each damping valve 150 is arranged in parallel with the first control valve 130 and the flow valve 140 corresponding to each other, and the flow direction is opposite to the corresponding flow valve 140. The restoring valve system 110 corresponds to the restoring damping valve 151, and the compression valve system 120 corresponds to the compression damping valve 152. The restoring damping valve 151 is used to guide the oil to flow from the rod chamber 101 to the connecting oil path 20, and the compression damping valve 152 is used to guide the oil to flow from the rodless chamber 102 to the connecting oil path 20. The arrangement of the restoring damping valve 151 and the compression damping valve 152 can also play a pressure dividing role on the corresponding restoring control valve 131 and the compression control valve 132, further improving the response speed. In addition, when the bidirectional hydraulic pump 40, the restoring control valve 131 and the compression control valve 132 all fail, the oil in the rodless chamber 102 and the rod chamber 101 can circulate through the compression damping valve 152, the compression circulation valve 142, the restoring damping valve 151 and the restoring circulation valve 141 to achieve the shock absorbing effect.

[0045] For example, when the piston 12 moves toward the rodless chamber 102, the oil in the rod chamber 101 flows through the first reversing valve 50 to the restoring damping valve 151, through the connecting oil path 20 to the compression flow valve 142, and then flows to the rodless chamber 102; conversely, the piston 12 moves toward the rod chamber 101, the oil in the rodless chamber 102 flows through the compression damping valve 152 to the connecting oil path 20, and then through the restoring flow valve 141 and the first reversing valve 50 to the rod chamber 101.

[0046] In some specific embodiments, each flow valve 140 and each damping valve 150 is a one-way valve, for example, a one-way valve with an elastic element, or further, a spring-type one-way valve.

[0047] like Figure 5 As shown, further, the restoring valve system 110 and the compression valve system 120 also include bypass valves 160, namely, a restoring bypass valve 161 and a compression bypass valve 162. Each bypass valve 160 is arranged in parallel with the first control valve 130, the damping valve 150 and the flow valve 140 corresponding to each other, so as to further play a role of pressure division, thereby reducing the movement resistance of the piston 12 and facilitating timely response. The bypass valve 160 can be a one-way valve or a throttle valve.

[0048] See also Figure 5 Optionally, the active hydraulic actuation system further includes a bypass oil circuit 60, one end of which is connected between the bidirectional hydraulic pump 40 and the first reversing valve 50, and the other end is connected to the compression valve system 120 or the recovery valve system 110. Such a setting can play a pressure-dividing role on the bidirectional hydraulic pump 40, thereby reducing the compression damping of the bidirectional hydraulic pump 40 when working. Specifically, taking the first reversing valve 50 disposed in the second access section 1002 as an example, one end of the bypass oil circuit 60 is connected between the bidirectional hydraulic pump 40 and the port A of the first reversing valve 50, and the other end is connected to the side of the compression control valve 132 in the compression valve system 120 away from the connecting oil circuit 20. Among them, the bypass oil circuit 60 is provided with a bypass throttle valve 61.

[0049] like Figure 5 As shown, further, the piston 12 is provided with a first piston one-way valve 121, a second piston one-way valve 122 and a second throttle valve 123, which are connected in parallel. The first piston one-way valve 121 is used to guide the oil to flow from the rod chamber 101 to the rodless chamber 102, the second piston one-way valve 122 is used to guide the oil to flow from the rodless chamber 102 to the rod chamber 101, and the second throttle valve 123 plays a pressure dividing role.

[0050] See also Figure 7In some other embodiments, when the first reversing valve 50 is arranged at the second access section 1002, the compression valve system includes a compression damping valve 152, and the recovery valve system includes a recovery damping valve 151 and a recovery bypass valve 161, which are connected in parallel and have opposite flow directions. The compression damping valve 152 and the recovery bypass valve 161 are connected in series through the connecting oil path 20, and the side of the recovery damping valve 151 away from the rod chamber 101 is connected to the side of the compression damping valve 152 facing the rodless chamber 102. Among them, the recovery damping valve 151 is used to guide the oil in the rod chamber 101 to flow to the rodless chamber 102, the compression damping valve 152 is used to guide the oil in the rodless chamber 102 to flow to the rod chamber 101, and the recovery bypass valve 161 is used to guide the oil from the connecting oil path 20 to flow to the rod chamber 101. When the piston 12 moves toward the rodless chamber 102, the oil overcomes the opening pressure of the restoring damping valve 151, flows directly to the port B of the first reversing valve 50 through it, and then flows to the rodless chamber 102 from the port C. Conversely, when the piston 12 moves toward the rod chamber 101, the oil flows from the port C to the port B, overcomes the opening resistance of the compression damping valve 152, flows to the restoring bypass valve 161 through it, and then flows to the rod chamber 101.

[0051] In this process, the reset bypass valve 161 is equivalent to being disposed between the connecting oil path 20 and the bidirectional hydraulic pump 40 , so that the oil of the bidirectional hydraulic pump 40 can be prevented from flowing to the connecting oil path 20 and then to the accumulator 30 .

[0052] Alternatively, when the first reversing valve 50 is disposed in the first access section 1001, the compression valve system includes a compression damping valve 152 and a compression bypass valve 162, which are connected in parallel and have opposite flow directions, and the recovery valve system includes a recovery damping valve 151. The side of the compression damping valve 152 facing away from the rodless chamber 102 is connected to the side of the recovery damping valve 151 facing the rod chamber 101. In this process, the compression bypass valve 162 is used to prevent the oil of the bidirectional hydraulic pump 40 from flowing to the accumulator 30.

[0053] That is to say, when one of the first access section 1001 and the second access section 1002 is provided with the first reversing valve 50, the compression valve system and the recovery valve system both include a damping valve 150, and one of them includes a bypass valve 160, the bypass valve 160 is connected in parallel with the corresponding damping valve 150 and has opposite flow directions, and the damping valve 150 corresponding to the other is connected in series with the bypass valve 160 through the connecting oil circuit 20, and the other end of the damping valve 150 corresponding to the bypass valve 160 is connected to the side of the other damping valve 150 away from the connecting oil circuit 20.

[0054] See also Figures 8 to 12In some embodiments, at least one of the compression valve system 120 and the recovery valve system 110 includes a first control valve 130, and the first control valve 130 is connected to the connecting oil circuit 20 at a side away from the rodless chamber 102 or the rod chamber 101, and the first oil circuit also includes a second control valve 80 connected in series to the bidirectional hydraulic pump 40. The first control valve 130 and the second control valve 80 can be selectively opened to switch the first oil circuit and the second oil circuit to selectively open.

[0055] When the first control valve 130 is open and the second control valve 80 is closed, the bidirectional hydraulic pump 40 and the hydraulic cylinder 10 cannot form a circulating oil circuit, that is, the first oil circuit is disconnected; at this time, the oil forms a circulating oil circuit through the first control valve 130, the recovery valve system 110, the connecting oil circuit 20, and the compression valve system 120, that is, the second oil circuit is opened, and the accumulator 30 is connected to adjust the damping of the hydraulic cylinder 10. On the contrary, when the first control valve 130 is closed and the second control valve 80 is closed, the first oil circuit is opened and the second oil circuit is disconnected.

[0056] Among them, the first control valve 130 and the second control valve 80 can adjust the corresponding flow damping size. When the damping increases, the oil will flow in the direction with smaller damping, and when the damping decreases, the oil will pass. Of course, the first control valve 130 and the second control valve 80 can also directly adjust the on-off of the oil circuit. Specifically, the first control valve 130 and the second control valve 80 can be variable throttle valves, or stop valves, on-off valves, etc., as long as they can meet the requirement of selectively opening the first oil circuit and the second oil circuit.

[0057] See also Figures 9 to 11 Optionally, the compression valve system 120 and the recovery valve system 110 both include a first control valve 130, namely, a compression control valve 132 and a recovery control valve 131. The compression valve system 120 and the recovery valve system 110 both include a circulation valve 140, namely, a compression circulation valve 142 and a recovery circulation valve 141, and each circulation valve 140 is arranged in parallel with the first control valve 130 corresponding to each other. When the second control valve 80 is opened, the recovery control valve 131 and the compression control valve 132 can be closed; conversely, when the recovery control valve 131 and the compression control valve 132 are opened, the second control valve 80 is closed. The recovery circulation valve 141 is used to guide the oil from the connecting oil path 20 to flow to the rod chamber 101, and the compression circulation valve 142 is used to guide the oil from the connecting oil path 20 to flow to the rodless chamber 102.

[0058] Furthermore, the compression valve system 120 and the recovery valve system 110 also include a damping valve 150, which is a compression damping valve 152 and a recovery damping valve 151. Each damping valve 150 is arranged in parallel with the corresponding first control valve 130 and the flow valve 140. The compression damping valve 152 is used to guide the oil to flow from the rodless chamber 102 to the rod chamber 101, and the recovery damping valve 151 is used to guide the oil to flow from the rod chamber 101 to the rodless chamber 102.

[0059] Furthermore, the compression valve system 120 and the recovery valve system 110 also include bypass valves 160 , namely a compression bypass valve 162 and a recovery bypass valve 161 , and each bypass valve 160 is arranged in parallel with the corresponding first control valve 130 and the flow valve 140 .

[0060] That is to say, based on the setting of the second control valve 80, the restoring control valve 131 and the compression control valve 132, the structure of the restoring valve system 110 and the compression valve system 120 can also be basically similar to the above-mentioned structure based on the first reversing valve 50. The functions of the bypass valve 160, the flow valve 140 and the damping valve 150 have been explained above, so they will not be repeated here.

[0061] like Fig.12 As shown, in another optional embodiment, one of the compression valve system and the return valve system includes a first control valve 130, and the other includes a flow valve 140, and the first control valve 130 and the flow valve 140 are connected in series through the connecting oil path 20. The compression valve system 120 and the return valve system 110 also include a damping valve 150, one of the damping valves 150 is connected in series between the first control valve 130 and the flow valve 140, and one end of the other damping valve 150 is connected to the side of the flow valve 140 away from the connecting oil path 20, and the other end is connected between the first control valve 130 and one of the damping valves 150.

[0062] For example, if the compression valve system includes the compression control valve 132, the recovery valve system includes the recovery circulation valve 141, the compression damping valve 152 is connected in series between the compression control valve 132 and the recovery circulation valve 141, and the recovery damping valve 151 is connected in parallel to the compression damping valve 152, the connecting oil path 20, and the recovery circulation valve 141. The accumulator 30 is connected to the connecting oil path 20. On the contrary, if the recovery valve system includes the recovery control valve 131, the compression valve system includes the compression circulation valve 142, the recovery damping valve 151 is connected in series between the recovery control valve 131 and the compression circulation valve 142, and the compression damping valve 152 is connected in parallel to the recovery damping valve 151, the connecting oil path 20, and the compression circulation valve 142.

[0063] See also Figure 2 and Fig.13 As another example, the active hydraulic actuation system further includes a second reversing valve 70, which is disposed at the second access position and has a port D, a port E, and a port F, and either the port D or the port E can be selectively connected to the port F. Among them, one of the port D and the port E is connected to the bidirectional hydraulic pump 40, and the other is connected to the connecting oil circuit 20, and the port F is connected to the recovery valve system 110 or the compression valve system 120.

[0064] That is to say, by using the setting of the second reversing valve 70, the oil flowing through the restoring valve system 110 or the compression valve system 120 can be adjusted to selectively flow to the connecting oil circuit 20 or to the two-way hydraulic pump 40, so as to realize the switching of the third oil circuit and the fourth oil circuit. Since the accumulator 30 is connected to the connecting oil circuit 20, the accumulator 30 and the two-way hydraulic pump 40 are selected to be used for the hydraulic cylinder 10, and the amount of oil flowing directly to the accumulator 30 through the two-way hydraulic pump 40 is reduced, so as to ensure the timely response when the damping adjustment of the hydraulic cylinder 10 is met based on the two-way hydraulic pump 40. Among them, the third access section 1003 is close to the restoring valve system 110, and the fourth access section 1004 is close to the compression valve system 120.

[0065] For example, the second reversing valve 70 is connected to the third access section 1003, and the port D of the second reversing valve 70 is connected to the two-way hydraulic pump 40, the port E is connected to the connecting oil circuit 20, and the port F is connected to the restoring valve system 110. When the valve core moves to the left position, the port F is connected to the port E, and the restoring valve system 110 and the compression valve system 120 are connected to the connecting oil circuit 20 through the second reversing valve 70, that is, the fourth oil circuit is opened. When the valve core moves to the right position, the port F is connected to the port D, and the restoring valve system 110 and the compression valve system 120 are connected through the two-way hydraulic pump 40, and the third oil circuit is opened.

[0066] The fourth access section 1004 can also be connected to the second reversing valve 70, and the port D of the second reversing valve 70 is connected to the two-way hydraulic pump 40, the port E is connected to the connecting oil circuit 20, and the port F is connected to the compression valve system 120. Alternatively, the third access section 1003 and the fourth access section 1004 can both be connected to a second reversing valve 70. It only needs to meet the requirement of selectively opening the third oil circuit and the fourth oil circuit.

[0067] like Fig.14 As shown, in some other embodiments, since the accumulator 30 is connected to the connecting oil circuit 20, a third control valve 31 may be provided between the accumulator 30 and the connecting oil circuit 20 to adjust the on-off of the accumulator 30 and the connecting oil circuit 20, or the flow damping size. The third control valve 31 may also be an optional throttle valve.

[0068] like Fig.15 and Fig.16 As shown, in other embodiments, a filter 91 may be provided on both the first access section 1001 and the second access section 1002 to filter impurities, iron filings, etc. in the oil, and a stop valve 92 may be provided on the side of the filter 91 away from the hydraulic cylinder 10 to facilitate shutting off the oil circuit for maintenance, overhaul, and other operations. At the same time, a refueling port hydraulic lock 93 may be provided on the first access section 1001 and the second access section 1002, respectively, to facilitate replenishing the oil. Pressure sensors 94 may be provided at both ends of the bidirectional hydraulic pump 40 to detect the pressure difference of the bidirectional hydraulic pump 40. The accumulator 30 may be connected to a charging valve 95 for inflation and pressure replenishment.

[0069] See also Figure 1 and Figure 2 Another embodiment of the present application provides a vibration reduction device, including the above-mentioned active hydraulic control system, which can be connected to the vehicle suspension to achieve vehicle vibration reduction. For example, the piston rod 13 of the hydraulic cylinder 10 in the active hydraulic control system is connected to the vehicle body, and when the vehicle is driving on a bumpy road, the vibration reduction demand can be met; and, it is precisely because the oil of the bidirectional hydraulic pump 40 can flow more fully to the hydraulic cylinder 10, the response timeliness is improved, thereby improving the vibration reduction performance of the vibration reduction device.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An active hydraulic actuation system, characterized in that: include: A hydraulic cylinder (10) having a rod chamber (101) and a rodless chamber (102), wherein the rod chamber (101) is connected to a restoring valve system (110) and a first access section (1001) is provided between the two, and the rodless chamber (102) is connected to a compression valve system (120) and a second access section (1002) is provided between the two; A communication oil circuit (20) connected to an end of the return valve system (110) and the compression valve system (120) away from the hydraulic cylinder (10); An accumulator (30) connected to the connecting oil path (20) and dividing the connecting oil path (20) into a third access section (1003) and a fourth access section (1004); The active hydraulic actuation system further comprises a bidirectional hydraulic pump (40); The two ends of the bidirectional hydraulic pump (40) can be connected to the first access section (1001) and the second access section (1002) respectively; or, the two ends of the bidirectional hydraulic pump (40) can be connected to the third access section (1003) and the fourth access section (1004) respectively.

2. The active hydraulic actuation system according to claim 1, characterized in that: The first access section (1001) and the second access section (1002) serve as a first access position of the bidirectional hydraulic pump (40), and the third access section (1003) and the fourth access section (1004) serve as a second access position of the bidirectional hydraulic pump (40); In the first access position, the hydraulic pump is connected to the hydraulic cylinder (10) to form a first oil circuit, and the hydraulic cylinder (10) is connected to the communication oil circuit (20) through the return valve system (110) and the compression valve system (120) to form a second oil circuit, and the first oil circuit and the second oil circuit are connected in parallel and can be opened selectively; In the second connection position, the hydraulic cylinder (10) is connected to the hydraulic pump through the restoring valve system (110) and the compression valve system (120) to form a third oil circuit, and the hydraulic cylinder (10) is connected to the connecting oil circuit (20) through the restoring valve system (110) and the compression valve system (120) to form a fourth oil circuit. The third oil circuit and the fourth oil circuit are connected in parallel and can be opened selectively.

3. The active hydraulic actuation system according to claim 2, characterized in that: The active hydraulic actuation system comprises a first reversing valve (50), the first reversing valve (50) being arranged at the first access position and having a port A, a port B and a port C, wherein either the port A or the port B can be selectively connected to the port C; Among them, one of the port A and the port B is connected to the bidirectional hydraulic pump (40), the other is connected to the recovery valve system (110) or the compression valve system (120), and the port C is connected to the rod chamber (101) or the rodless chamber (102).

4. The active hydraulic actuation system according to claim 3, characterized in that: The active hydraulic actuation system further comprises a bypass oil circuit (60), one end of the bypass oil circuit (60) being connected between the bidirectional hydraulic pump (40) and the first reversing valve (50), and the other end of the bypass oil circuit (60) being connected to the compression valve system (120) or the recovery valve system (110).

5. The active hydraulic actuation system according to claim 4, characterized in that: The compression valve system (120) and the recovery valve system (110) both include a first control valve (130) and a circulation valve (140), which are connected in parallel, and the other end of the bypass oil path (60) is connected to a side of the first control valve (130) that is away from the communication oil path (20).

6. The active hydraulic actuation system according to claim 3, characterized in that: The compression valve system (120) and the recovery valve system (110) both include a first control valve (130), and the first control valves (130) are connected in series via the communication oil path (20).

7. The active hydraulic actuation system according to claim 3, characterized in that: One of the first access section (1001) and the second access section (1002) is provided with the first reversing valve (50); The compression valve system (120) and the recovery valve system (110) both include a damping valve (150), and one of them includes a circulation valve (140), the circulation valve (140) and the corresponding damping valve (150) are connected in parallel and have opposite flow directions, and the damping valve (150) corresponding to the other is connected in series with the circulation valve (140) via the connecting oil path (20), and the other end of the damping valve (150) corresponding to the circulation valve (140) is connected to a side of the other damping valve (150) that is away from the connecting oil path (20).

8. The active hydraulic actuation system according to claim 2, characterized in that: The compression valve system (120) and / or the recovery valve system (110) at least comprises a first control valve (130), wherein the first control valve (130) is connected in series with the communication oil passage (20); The first oil circuit further comprises a second control valve (80) connected in series to the bidirectional hydraulic pump (40); The first control valve (130) and the second control valve (80) can be selectively opened to switch the first oil circuit and the second oil circuit to be selectively opened.

9. The active hydraulic actuation system according to claim 8, characterized in that: The compression valve system (120) and the recovery valve system (110) both include a first control valve (130); The compression valve system (120) and the recovery valve system (110) both further include a circulation valve (140), and each of the circulation valves (140) is arranged in parallel with the first control valve (130) corresponding to the first control valve (130); The circulation valve (140) of the compression valve system (120) is used to guide the oil to flow from the rod chamber (101) to the rodless chamber (102), and the circulation valve (140) of the recovery valve system (110) is used to guide the oil to flow from the rodless chamber (102) to the rod chamber (101).

10. The active hydraulic actuation system according to claim 5 or claim 9, characterized in that: The compression valve system (120) and / or the recovery valve system (110) further comprises a damping valve (150), wherein the damping valve (150) is arranged in parallel with the corresponding first control valve (130) and the flow valve (140), and the flow direction of the damping valve (150) is opposite to that of the corresponding flow valve (140); The damping valve (150) of the compression valve system (120) is used to guide oil to flow from the rodless chamber (102) to the rod chamber (101), and the damping valve (150) of the recovery valve system (110) is used to guide oil to flow from the rod chamber (101) to the rodless chamber (102).

11. The active hydraulic actuation system according to claim 10, characterized in that: The compression valve system (120) and / or the recovery valve system (110) further comprises a bypass valve (160), wherein the bypass valve (160) is arranged in parallel with the corresponding first control valve (130), the flow valve (140) and the damping valve (150).

12. The active hydraulic actuation system according to claim 8, characterized in that: One of the compression valve system (120) and the recovery valve system (110) includes a first control valve (130), and the other includes a circulation valve (140); the first control valve (130) and the circulation valve (140) are connected in series via the communication oil passage (20); The compression valve system (120) and the recovery valve system (110) both further include a damping valve (150); The first control valve (130) and the circulation valve (140) are both connected in series with one of the damping valves (150); one end of the other damping valve (150) is connected to a side of the circulation valve (140) facing away from the first control valve (130), and the other end is connected between the first control valve (130) and one of the damping valves (150).

13. The active hydraulic actuation system according to claim 2, characterized in that: The active hydraulic actuation system further comprises a second reversing valve (70), the second reversing valve (70) being arranged at the second access position and having a port D, a port E and a port F, wherein either the port D or the port E can be selectively connected to the port F; One of the port D and the port E is connected to the bidirectional hydraulic pump (40), and the other is connected to the connecting oil path (20); and the port F is connected to the restoring valve system (110) or the compression valve system (120).

14. The active hydraulic actuation system according to claim 1, characterized in that: The active hydraulic actuation system further comprises a third control valve (31), wherein the third control valve (31) is arranged between the accumulator (30) and the communicating oil passage (20).

15. A vibration reduction device, characterized in that: The vibration reduction device comprises the active hydraulic actuation system according to any one of claims 1 to 14.

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