Hydraulic actuating system and damping device provided with hydraulic actuating system

Abstract

The invention relates to the technical field of hydraulic control, and provides a hydraulic actuating system and a damping device provided with the hydraulic actuating system. The hydraulic actuating system comprises a first actuating oil way, a second actuating oil way and a main control oil way, the main control oil way is provided with at least two sets of connecting ends connected in parallel, one set of connecting ends is connected to the two ends of the first actuating oil way, and the other set of connecting ends is connected to the two ends of the second actuating oil way. The main control oil way comprises a one-way pump and a first one-way valve which are connected in series between the upstream interface and the downstream interface; the hydraulic actuating system has a first state and a second state; in the first state, the main control oil way is communicated with the first actuating oil way, and / or the main control oil way is communicated with the second actuating oil way; and in the second state, the first actuating oil way and the second actuating oil way are communicated through the main control oil way. The hydraulic actuation system provided by the invention can make up for the delayed response during forward and reverse rotation conversion of the bidirectional hydraulic pump, and is beneficial to improving the response speed.

Description

Technical Field

[0001] The present application relates to the field of hydraulic control technology, and in particular to a hydraulic actuation system and a vibration reduction device equipped with 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.

[0003] In the related art, when actively controlling the hydraulic cylinder, a bidirectional hydraulic pump is mostly used to provide active damping. However, the bidirectional hydraulic pump requires a motor to drive it. When the motor is started or the speed increases or decreases, the motor rotor will have a certain delayed response time due to the rotational inertia, which will cause the forward and reverse conversion response of the bidirectional hydraulic pump to be slow, which is not conducive to timely feedback of the damping adjustment of the hydraulic cylinder. Summary of the invention

[0004] Based on this, it is necessary to provide a hydraulic actuation system that can compensate for the delayed response of the bidirectional hydraulic pump during forward and reverse conversion, which is conducive to improving the response speed.

[0005] A hydraulic actuation system comprises a first actuation oil circuit, a second actuation oil circuit and a main control oil circuit; The main control oil circuit has at least two groups of parallel connection ends, each of which includes an upstream interface and a downstream interface, wherein the upstream interface and the downstream interface of one group of the connection ends are respectively connected to the two ends of the first actuation oil circuit, and the upstream interface and the downstream interface of the other group of the connection ends are respectively connected to the two ends of the second actuation oil circuit; the main control oil circuit includes a one-way pump and a first one-way valve, which are arranged in series between the upstream interface and the downstream interface; the hydraulic actuation system has a first state and a second state; In the first state, the main control oil circuit is connected to the first actuating oil circuit, and / or the main control oil circuit is connected to the second actuating oil circuit; in the second state, the first actuating oil circuit and the second actuating oil circuit are connected through the main control oil circuit.

[0006] It can be understood that by using the parallel arrangement of at least two connection ends relative to the hydraulic pump circuit, the first actuating oil circuit and the second actuating oil circuit are respectively connected to the main control oil circuit, that is, the first actuating oil circuit and the second actuating oil circuit share the main control oil circuit to meet the active control of the first actuating oil circuit and the second actuating oil circuit. In this process, on the one hand, due to the setting of the one-way pump in the main control oil circuit, there is no need to perform forward and reverse conversion, so there is no need to face the delayed response problem when the hydraulic pump is switched forward and reverse; on the other hand, the setting of at least two connection ends can connect the first actuating oil circuit and the second actuating oil circuit, and then use the circulation between the first actuating oil circuit and the second actuating oil circuit to achieve damping adjustment. In other words, the hydraulic actuation system provided by the present application uses the interconnection and coordination of the one-way pump and the first actuating oil circuit and the second actuating oil circuit, so that the system can meet the active damping control without the forward and reverse operation of the pump, thereby compensating for the delayed response when the bidirectional hydraulic pump is switched forward and reverse, which is conducive to improving the response speed.

[0007] In some embodiments, the main control oil circuit includes a first hydraulic pump circuit and a second hydraulic pump circuit, which are connected in parallel and flow in opposite directions, and both ends of the first hydraulic pump circuit are the first connection ends, and both ends of the second hydraulic pump circuit are the second connection ends; The first hydraulic pump circuit and the second hydraulic pump circuit can selectively communicate with the first actuating oil circuit; and / or the first hydraulic pump circuit and the second hydraulic pump circuit can selectively communicate with the second actuating oil circuit.

[0008] In some embodiments, the hydraulic actuation system further includes a control valve group, which includes a plurality of control valves, and the plurality of control valves are separately arranged between the first actuation oil circuit and the first hydraulic pump circuit, and between the second actuation oil circuit and the second hydraulic pump circuit.

[0009] In some embodiments, the control valve is respectively provided at each of the upstream interfaces and each of the downstream interfaces.

[0010] In some embodiments, the first actuating oil circuit includes a first hydraulic cylinder having a first rodless cavity and a first rod cavity, and the second actuating oil circuit includes a second hydraulic cylinder having a second rodless cavity and a second rod cavity; at least two groups of connecting ends are respectively a first connecting end and a second connecting end, and among the plurality of control valves, the first connecting end corresponds to the first control valve and the second control valve, and the second connecting end corresponds to the third control valve and the fourth control valve; In the second state, the first control valve and the third control valve can be opened simultaneously to connect the first rod chamber and the second rodless chamber; and / or the second control valve and the fourth control valve can be opened simultaneously to connect the first rodless chamber and the second rod chamber.

[0011] In some embodiments, the first actuating oil circuit and the second actuating oil circuit both include a hydraulic cylinder having a rodless chamber and a rod chamber and a control circuit, and the two ends of each of the control circuits are respectively connected to the corresponding rodless chamber and the rod chamber, and are connected in parallel with the main control oil circuit; the control valve group also includes a first reversing valve, and one of the upstream interface and the downstream interface of the same connecting end is provided with the first reversing valve, and the other is provided with the control valve, and each of the first reversing valves is used to adjust the corresponding control circuit and the main control oil circuit to selectively connect to the corresponding hydraulic cylinder.

[0012] In some embodiments, each of the first reversing valves has a port A, a port B and a port C, and the port B and the port C can be selectively connected to the port A; the port A is connected to the corresponding rodless chamber or the rod chamber, the port B is connected to the corresponding control circuit, and the port C is connected to the main control oil circuit.

[0013] In some embodiments, the hydraulic actuation system also includes a second reversing valve; the second reversing valve is provided between the first actuating oil circuit and the main control oil circuit, and between the second actuating oil circuit and the main control oil circuit; the first actuating oil circuit and the second actuating oil circuit both include a hydraulic cylinder having a rodless chamber and a rod chamber, and the second reversing valve is used to adjust one of the corresponding rodless chamber and the rod chamber to connect to the upstream interface and the other to connect to the downstream interface.

[0014] In some embodiments, the first actuating oil circuit and the second actuating oil circuit both include a hydraulic cylinder, a restoring valve system and a compression valve system, each of the restoring valve systems is connected to the rod chamber of the corresponding hydraulic cylinder, and each of the compression valve systems is connected to the rodless chamber of the corresponding hydraulic cylinder; the restoring valve system is connected to the corresponding compression valve system to define a control circuit, and the control circuit is connected in parallel with the main control oil circuit.

[0015] In some embodiments, the first actuating oil circuit and the second actuating oil circuit further include accumulators, each of the accumulators is connected to the corresponding control circuit and has an access point, and the recovery valve system and the compression valve system are respectively arranged on both sides of the corresponding access point.

[0016] In some embodiments, the first actuating oil circuit and the second actuating oil circuit both include a hydraulic cylinder; the hydraulic cylinder includes at least a cylinder body having a cavity and a piston slidably arranged in the cavity, the piston divides the cavity into a rodless cavity and a rod cavity, and the piston is provided with a piston damping valve and / or a piston bypass valve connecting the rodless cavity and the rod cavity.

[0017] Yet another embodiment of the present application provides a vibration reduction device, comprising the above-mentioned hydraulic actuation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A schematic diagram of a hydraulic actuation system provided by an embodiment of the present application; Figure 2 Another schematic diagram of a hydraulic actuation system provided by an embodiment of the present application; Figure 3 A schematic diagram of a hydraulic actuation system provided by another embodiment of the present application; Figure 4 Another schematic diagram of a hydraulic actuation system provided by another embodiment of the present application; Figure 5 A schematic diagram of a hydraulic actuation system provided in yet another embodiment of the present application; Figure 6 Another schematic diagram of a hydraulic actuation system provided in yet another embodiment of the present application.

[0020] 1. The first hydraulic cylinder; 2. The fifth control valve; 3. The second hydraulic cylinder; 4. The sixth control valve; 5. The main control oil circuit; 6. The hydraulic pump circuit; 7. The first hydraulic pump circuit; 8. The second hydraulic cylinder; 9. The sixth control valve; 10. The first hydraulic circuit; 11. The first hydraulic cylinder; 12. The fifth control valve; 20. The second hydraulic circuit; 21. The second hydraulic cylinder; 22. The sixth control valve; 30. The main control oil circuit; 31. The hydraulic pump circuit; 31a. The first hydraulic pump circuit; 31b. The second hydraulic pump circuit; 32. The first connecting end; 33. The second connecting end; 40. The control circuit; 40a. The first control circuit; 40b. The second control circuit; 41. The recovery valve system; 42. The compression valve system; 43. The accumulator; 43a. The first accumulator; 43b. The second accumulator; 51. The cylinder body; 52. The piston; 53. The piston rod; 54. The piston damping valve; 55. The piston bypass valve; 60. The control valve group; 61. The control valve; 62. The first reversing valve; 71. The first controller; 72. The second controller; 80. The second Reversing valve; 91, filter; 92, stop valve; 93, fuel filler port hydraulic lock; 94, pressure sensor; 95, charging valve; 301, upstream interface; 302, downstream interface; 311, one-way pump; 312, first one-way valve; 401, control damping valve; 401a, first control damping valve; 401b, second control damping valve; 402, bypass valve; 411, recovery damping valve; 412, recovery circulation valve; 421, compression damping valve; 422, compression circulation valve; 541, first piston damping valve; 542, second piston damping valve; 611, first control valve; 612, second control valve; 613, third control valve; 614, fourth control valve; 1101, first rodless chamber; 1102, first rod chamber; 2101, second rodless chamber; 2102, second rod chamber. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] See also Figures 1 to 6 An embodiment of the present application provides a hydraulic actuation system, including a first actuation oil circuit 10, a second actuation oil circuit 20 and a main control oil circuit 30, wherein the main control oil circuit 30 is connected between the first actuation oil circuit 10 and the second actuation oil circuit 20. The hydraulic actuation system has a first state and a second state. In the first state, the first actuation oil circuit 10 and the second actuation oil circuit 20 are respectively connected to the main control oil circuit 30, so that the first actuation oil circuit 10 and the second actuation oil circuit 20 share one main control oil circuit 30, satisfying the load response of each actuation oil circuit (i.e., the first actuation oil circuit 10 and the second actuation oil circuit 20). In the second state, the first actuation oil circuit 10 and the second actuation oil circuit 20 can be connected through the main control oil circuit 30 to achieve cross balance between the first actuation oil circuit 10 and the second actuation oil circuit 20.

[0027] Among them, the main control oil circuit 30 includes a hydraulic pump circuit 31, a first connection end 32 and a second connection end 33. The first connection end 32 and the second connection end 33 are connected in parallel to the hydraulic pump circuit 31. The first connection end 32 is connected to the first actuating oil circuit 10, and the second connection end 33 is connected to the second actuating oil circuit 20. Specifically, the first connection end 32 and the second connection end 33 both have an upstream interface 301 and a downstream interface 302. The first actuating oil circuit 10 and the second actuating oil circuit 20 both have a rodless cavity interface and a rod cavity interface. Each upstream interface 301 and downstream interface 302 are respectively connected to the corresponding rodless cavity interface and rod cavity interface. The hydraulic pump circuit 31 includes a one-way pump 311 and a first one-way valve 312, which are arranged in series. The first one-way valve 312 is used to guide the oil to flow through the one-way pump 311 in only one direction. Taking the flow direction of oil flowing through the first one-way valve 312 as an example, each upstream interface 301 is located upstream of the first one-way valve 312 , and each downstream interface 302 is located downstream of the first one-way valve 312 .

[0028] In the first state, the hydraulic pump circuit 31 is connected to the first actuating oil circuit 10 through the first connecting end 32, and the hydraulic pump circuit 31 is connected to the second actuating oil circuit 20 through the second connecting end 33, so that the first actuating oil circuit 10 and the second actuating oil circuit 20 share the hydraulic pump circuit 31, satisfying the active control of the first actuating oil circuit 10 and the second actuating oil circuit 20. In the second state, the rodless cavity interface and the rod cavity interface of the first actuating oil circuit 10 can be connected to the rod cavity interface and the rodless cavity interface of the second actuating oil circuit 20 through the first connecting end 32 and the second connecting end 33, so as to satisfy the cross balance between the two actuating oil circuits.

[0029] That is to say, in this embodiment, it is precisely because of the setting of the one-way pump 311 and the first one-way valve 312 in the hydraulic pump circuit 31 that it can ensure that the oil only needs to flow in one direction when flowing through the hydraulic pump circuit 31, and there is no need for the forward and reverse conversion of the hydraulic pump, so there is no need to face the delayed response problem when the hydraulic pump is reversed. At the same time, due to the setting of the first connecting end 32 and the second connecting end 33, the first actuating oil circuit 10 and the second actuating oil circuit 20 can be connected, and then the circulation between the first actuating oil circuit 10 and the second actuating oil circuit 20 can be used to achieve the damping adjustment and internal cross balance of each actuating oil circuit. In this process, the forward and reverse rotation of the bidirectional hydraulic pump is not required to meet the oil circulation in each actuating oil circuit. Therefore, the hydraulic actuation system provided in this embodiment uses the interconnection and cooperation of the one-way pump 311 and the first actuating oil circuit 10 and the second actuating oil circuit 20, so that the system can meet the bidirectional active damping control without the forward and reverse operation of the pump, thereby avoiding the delayed response of the hydraulic pump during the forward and reverse conversion, which is conducive to improving the response speed.

[0030] The first actuating oil circuit 10 and the second actuating oil circuit 20 both include hydraulic cylinders, each hydraulic cylinder including a cylinder body 51 having a cavity, a piston 52 slidably disposed in the cavity, and a piston rod 53 connected to the piston 52, and the end of the piston rod 53 away from the piston 52 is used to connect the load. The piston 52 and the piston rod 53 separate the cavity into a rod cavity and a rodless cavity, and the piston 52 moves along the axial direction of the piston rod 53 to adjust the volume of the rodless cavity and the rod cavity to realize oil circulation. The first actuating oil circuit 10 corresponds to the first hydraulic cylinder 11, and the second actuating oil circuit 20 corresponds to the second hydraulic cylinder 21.

[0031] In some embodiments, a piston 52 in each hydraulic cylinder is provided with a piston damping valve 54 and a piston bypass valve 55, which are arranged in parallel. The piston damping valve 54 includes a first piston damping valve 541 and a second piston damping valve 542, both of which are connected in parallel with the piston bypass valve 55. The first piston damping valve 541 is used to guide the oil to flow from the rodless chamber to the rod chamber, and the second piston damping valve 542 is used to guide the oil to flow from the rod chamber to the rodless chamber. The first piston damping valve 541 and the second piston damping valve 542 both use a one-way valve with an elastic element, such as a spring-type one-way valve. The piston bypass valve 55 uses a throttle valve.

[0032] See also Figures 1 to 4 As some examples, the hydraulic pump circuit 31 includes a first hydraulic pump circuit 31a and a second hydraulic pump circuit 31b, which are connected in parallel and have opposite flow directions. The first hydraulic pump circuit 31a is connected in series with the first connection end 32, and the second hydraulic pump circuit 31b is connected in series with the second connection end 33. In some specific embodiments, the first one-way valve 312 in each hydraulic pump circuit 31 is arranged upstream of the corresponding one-way pump 311, that is, at the oil inlet of the one-way pump 311. Then each upstream interface 301 is close to the side of the corresponding first one-way pump 311, and each downstream interface 302 is close to the side of the corresponding one-way pump 311.

[0033] In some specific embodiments, the rod chamber of the first hydraulic cylinder 11 is communicated with the upstream interface 301 of the first connecting end 32, and the rodless chamber is communicated with the downstream interface 302 of the first connecting end 32; and the rod chamber of the second hydraulic cylinder 21 is communicated with the upstream interface 301 of the second connecting end 33, and the rodless chamber is communicated with the downstream interface 302 of the second connecting end 33. Due to the parallel connection of the first hydraulic pump circuit 31a and the second hydraulic pump circuit 31b, the rod chamber of the first hydraulic cylinder 11 is communicated with the downstream interface 302 of the second connecting end 33, and the rodless chamber is communicated with the upstream interface 301 of the second connecting end 33; and the rod chamber of the second hydraulic cylinder 21 is communicated with the downstream interface 302 of the first connecting end 32, and the rodless chamber is communicated with the upstream interface 301 of the first connecting end 32.

[0034] For the first hydraulic cylinder 11, when the piston 52 of the first hydraulic cylinder 11 moves toward the rodless chamber, the oil in the rodless chamber flows to the upstream port 301 of the second connection end 33, and flows to the rod chamber from the downstream port 302 of the second connection end 33 via the second hydraulic pump circuit 31b. Conversely, when the piston 52 of the first hydraulic cylinder 11 moves toward the rod chamber, the oil in the rod chamber flows to the upstream port 301 of the first connection end 32, and flows to the rodless chamber from the downstream port 302 of the first connection end 32 via the first hydraulic pump circuit 31a. For the second hydraulic cylinder 21, when the piston 52 of the second hydraulic cylinder 21 moves toward the rodless chamber, the oil in the rodless chamber flows to the upstream port 301 of the first connection end 32, and flows to the rod chamber of the second hydraulic cylinder 21 from the downstream port 302 of the first connection end 32 via the first hydraulic pump circuit 31a. Conversely, when the piston 52 of the second hydraulic cylinder 21 moves toward the rod chamber, the oil in the rod chamber flows to the upstream interface 301 of the second connecting end 33, and flows from the upstream interface 301 of the second connecting end 33 to the corresponding rodless chamber via the second hydraulic pump path 31b.

[0035] That is to say, the first hydraulic pump circuit 31a and the second hydraulic pump circuit 31b can select one of the rodless chamber and the rod chamber of the first hydraulic cylinder 11 to connect according to the working pressure of the first hydraulic cylinder 11; and the first hydraulic pump circuit 31a and the second hydraulic pump circuit 31b can select one of the rodless chamber and the rod chamber to connect according to the working pressure of the second hydraulic cylinder 21.

[0036] See also Figure 1 and Figure 2 Optionally, the hydraulic actuation system further includes a control valve group 60, so as to adjust the connection state of the first hydraulic pump circuit 31a and the second hydraulic pump circuit 31b relative to the first hydraulic cylinder 11 and the second hydraulic cylinder 21 through the setting of the control valve group 60. Specifically, the control valve group 60 includes a plurality of control valves 61, and the plurality of control valves 61 are respectively arranged between the first actuation oil circuit 10 and the first hydraulic pump circuit 31a, and between the second actuation oil circuit 20 and the second hydraulic pump circuit 31b. When the control valve 61 is opened, the oil is connected; otherwise, when the control valve 61 is closed, the oil is interrupted. Moreover, the valve opening of the control valve 61 can be adjusted to adjust the corresponding oil flow rate to achieve different damping adjustments.

[0037] Further, each upstream interface 301 and each downstream interface 302 is provided with a control valve 61. For example, the upstream interface 301 of the first connection end 32 is provided with a first control valve 611, and the corresponding downstream interface 302 is provided with a second control valve 612; and the upstream interface 301 of the second connection end 33 is provided with a third control valve 613, and the corresponding downstream interface 302 is provided with a fourth control valve 614. In actual use, the hydraulic actuation system further includes a first controller 71 and a second controller 72, the first controller 71 is used to control the first control valve 611 and the second control valve 612, and the second controller 72 is used to control the third control valve 613 and the fourth control valve 614.

[0038] The first hydraulic cylinder 11 corresponds to the first rodless cavity 1101 and the first rod cavity 1102 , and the second hydraulic cylinder 21 corresponds to the second rodless cavity 2101 and the second rod cavity 2102 .

[0039] When the first control valve 611 and the second control valve 612 are both opened, the first actuation oil circuit 10 is connected to the main control oil circuit 30 to meet the active control of the first actuation oil circuit 10; conversely, when the third control valve 613 and the fourth control valve 614 are both opened, the second actuation oil circuit 20 is connected to the main control oil circuit 30 to meet the active control of the second actuation oil circuit 20. The specific adjustment method is described above and will not be repeated here.

[0040] At the same time, when the first control valve 611 and the third control valve 613 are opened at the same time, the first rodless chamber 1101 of the first hydraulic cylinder 11 is connected to the second rod chamber 2102 of the second hydraulic cylinder 21; conversely, when the second control valve 612 and the fourth control valve 614 are opened at the same time, the first rod chamber 1102 of the first hydraulic cylinder 11 is connected to the second rodless chamber 2101 of the second hydraulic cylinder 21. In this way, the cross balance adjustment between the first actuating oil circuit 10 and the second actuating oil circuit 20 can be achieved.

[0041] In summary, it can be seen that the setting of the first hydraulic pump circuit 31a and the second hydraulic pump circuit 31b can be utilized, combined with the cooperation of the first control valve 611, the second control valve 612, the third control valve 613 and the fourth control valve 614, to further adjust the active control of the first actuating oil circuit 10 and the second actuating oil circuit 20. During the entire adjustment process, there is no need to switch the forward and reverse rotation of the hydraulic pump to meet the load adjustment of the first hydraulic cylinder 11 and the second hydraulic cylinder 21, which compensates for the response delay during the forward and reverse conversion of the bidirectional hydraulic pump, thereby improving the response speed of each hydraulic cylinder.

[0042] See also Figure 1 and Figure 2In some embodiments, the first actuating oil circuit 10 and the second actuating oil circuit 20 both further include a restoring valve system 41 and a compression valve system 42, the restoring valve system 41 is connected to the rod chamber, and the compression valve system 42 is connected to the rod chamber. The restoring valve system 41 and the compression valve system 42 are connected to form a control circuit 40, and the control circuit 40 is connected in parallel with the main control oil circuit 30. Further, the first actuating oil circuit 10 and the second actuating oil circuit 20 further include an accumulator 43, the accumulator 43 is connected to the control circuit 40 and has an access point with the corresponding control circuit 40, and the restoring valve system 41 and the compression valve system 42 are arranged on both sides of the corresponding access point. The accumulator 43 is used to provide high-pressure oil to the corresponding hydraulic cylinder for damping adjustment.

[0043] In some specific embodiments, the restoring valve system 41 and the compression valve system 42 both include a control damping valve 401. Each control damping valve 401 and the aforementioned first control valve 611, second control valve 612, third control valve 613 and fourth control valve 614 are variable throttle valves.

[0044] For the first actuating oil circuit 10, the first control circuit 40a, the first control damping valve 401a and the first accumulator 43a correspond. When the first control valve 611 and the second control valve 612 are closed, the first control damping valve 401a is opened, and the first rodless chamber 1101 and the first rod chamber 1102 are connected through the first control circuit 40a, so as to achieve damping adjustment by using the first accumulator 43a; on the contrary, when the first control valve 611 and the second control valve 612 are opened, the first control damping valve 401a is closed, and the first rodless chamber 1101 and the first rod chamber 1102 are connected through the first hydraulic pump circuit 31a and the second hydraulic pump circuit 31b to achieve damping adjustment.

[0045] For the second actuating oil circuit 20, the second control circuit 40b, the second control damping valve 401b and the second accumulator 43b correspond. When the third control valve 613 and the fourth control valve 614 are closed, the second control damping valve 401b is opened, and the second rodless chamber 2101 and the second rod chamber 2102 are connected through the second control circuit 40b to achieve damping adjustment using the second accumulator 43b; conversely, when the third control valve 613 and the fourth control valve 614 are opened, the second control damping valve 401b is closed, and the second rodless chamber 2101 and the second rod chamber 2102 are connected through the first hydraulic pump circuit 31a and the second hydraulic pump circuit 31b to achieve damping adjustment.

[0046] When the first control valve 611 and the third control valve 613 are opened, the two first control damping valves 401a are opened, the two second control damping valves 401b are closed, and the first rodless chamber 1101 is connected to the second rod chamber 2102 through the first control path 40a, the first control valve 611, the first hydraulic pump path 31a and the third control valve 613. When the second control valve 612 and the fourth control valve 614 are opened, the two first control damping valves 401a are opened, the two second control damping valves 401b are closed, and the first rod chamber 1102 is connected to the second rodless chamber 2101 through the first control path 40a, the second control valve 612, the second hydraulic pump path 31b and the fourth control valve 614.

[0047] Furthermore, the restoring valve system 41 also includes a restoring damping valve 411 and a restoring circulation valve 412, which are connected in parallel and have opposite flow directions; and the compression valve system 42 also includes a compression damping valve 421 and a compression circulation valve 422, which are connected in parallel and have opposite flow directions. The restoring damping valve 411, the restoring circulation valve 412, the compression damping valve 421 and the compression circulation valve 422 all use a one-way valve with an elastic element, such as a spring-type one-way valve. The restoring damping valve 411 and the compression circulation valve 422 have the same flow direction, which is used to guide the oil to flow from the rod chamber to the rodless chamber; and the compression damping valve 421 and the restoring circulation valve 412 have the same flow direction, which is used to guide the oil to flow from the rodless chamber to the rod chamber.

[0048] Furthermore, the recovery valve system 41 and the compression valve system 42 also include a bypass valve 402 to maintain damping when the piston 52 is stationary or running at an extremely low speed.

[0049] Among them, as for the recovery valve system 41, the corresponding control damping valve 401, the recovery damping valve 411, the recovery flow valve 412 and the bypass valve 402 are all arranged in parallel. The compression valve system 42 is basically similar to it, so it is not repeated here.

[0050] In actual use, when the piston 52 is stationary or running at an extremely low speed, the rodless chamber and the rod chamber are connected through the bypass valve 402 in the compression valve system 42 and the recovery valve system 41 and the piston bypass valve 55 on the piston 52 to maintain damping adjustment. When the running speed of the piston 52 increases, damping adjustment can be performed through the first piston damping valve 541 and the second piston damping valve 542 on the piston 52, and damping adjustment can also be performed through the recovery damping valve 411, the compression circulation valve 422, the compression damping valve 421, and the recovery circulation valve 412. When the running speed of the piston 52 increases again, it can be adjusted by controlling the damping valve 401, for example, increasing the opening. When the running speed of the piston 52 increases further, it is adjusted through the first control valve 611, the second control valve 612, the third control valve 613, the fourth control valve 614 and the first hydraulic pump circuit 31a and the second hydraulic pump circuit 31b.

[0051] See also Figure 3 and Figure 4 In another optional embodiment, the control valve group 60 further includes a first reversing valve 62. Two first reversing valves 62 are provided, one first reversing valve 62 corresponds to the first actuating oil circuit 10, and the other first reversing valve 62 corresponds to the second actuating oil circuit 20. As for the upstream interface 301 and the downstream interface 302 of the same connection end, one of the two is correspondingly connected to the first reversing valve 62, and the other is correspondingly connected to the control valve 61. Each first control valve 611 is used to adjust the corresponding control circuit 40 and the main control oil circuit 30 to select one to connect to the corresponding hydraulic cylinder.

[0052] The first reversing valve 62 has a port A, a port B and a port C, and either the port B or the port C can be connected to the port A. The port A is connected to the corresponding rodless cavity or the rod cavity, the port B is connected to the corresponding control path 40, and the port C is connected to the main control oil path 30. That is, the first reversing valve 62 is a three-way valve, for example, a two-position three-way valve.

[0053] Taking the first actuating oil circuit 10 as an example, the first reversing valve 62 is provided at the upstream interface 301, the port A of the first reversing valve 62 is connected to the first rod chamber 1102 of the first hydraulic cylinder 11, and the downstream interface 302 is provided with a second control valve 612. Figure 3 As shown, the first reversing valve 62 has an upper position and a lower position. When the first reversing valve 62 is in the upper position, the port A and the port C are connected, and the first rodless chamber 1101, the main control oil circuit 30 and the first rod chamber 1102 are connected to form a circulating oil circuit for damping adjustment; at this time, the second control valve 612 is opened. When the first reversing valve 62 is in the lower position, the port A and the port B are connected, and the first rodless chamber 1101, the first control circuit 40a and the first rod chamber 1102 are connected to form a circulating oil circuit; at this time, the second control valve 612 is closed.

[0054] For the second actuating oil circuit 20, the corresponding first reversing valve 62 is provided at the downstream interface 302, and the corresponding port A is connected to the second rodless chamber 2101 of the second hydraulic cylinder 21, and the corresponding upstream interface 301 is provided with a third control valve 613. When the first reversing valve 62 in the second actuating oil circuit 20 is in the upper position, the second rodless chamber 2101, the main control oil circuit 30 and the second rod chamber 2102 are connected, and the third control valve 613 is opened; on the contrary, when it is in the lower position, the second rodless chamber 2101, the second control circuit 40b and the second rod chamber 2102 are connected, and the third control valve 613 is closed.

[0055] Alternatively, the first reversing valve 62 on the first actuating oil circuit 10 may also be arranged at the downstream interface 302, and the corresponding upstream interface 301 may be provided with a first control valve 611; and the first reversing valve 62 on the second actuating oil circuit 20 may also be arranged at the upstream interface 301, and the corresponding downstream interface 302 may be provided with a fourth control valve 614.

[0056] See also Figure 5 and Figure 6 As another example, the hydraulic actuation system further includes a second reversing valve 80. A second reversing valve 80 is provided between the first actuation oil circuit 10 and the main control oil circuit 30, and between the second actuation oil circuit 20 and the main control oil circuit 30. Each second reversing valve 80 is used to adjust the corresponding rodless chamber and rod chamber, one of which is connected to the upstream interface 301, and the other is connected to the downstream interface 302. In other words, the second reversing valve 80 can be set to adjust the oil flowing out in one direction through the main control oil circuit 30 to flow to the rodless chamber or the rod chamber, so as to meet the damping adjustment under large load.

[0057] Specifically, the second reversing valve 80 has a port E, a port F, a port G, and a port H. Taking the second reversing valve 80 corresponding to the first actuating oil circuit 10 as an example, the port E is connected to one end of the first control circuit 40a and communicates with the first rod chamber 1102, the port F is connected to the other end of the first control circuit 40a and communicates with the first rodless chamber 1101, the port G is connected to the upstream interface 301, and the port H is connected to the downstream interface 302. The second reversing valve 80 has an upper position and a lower position. When the second reversing valve 80 is in the upper position, the port E is connected to the port G, the port F is connected to the port H, and the oil flowing out in one direction through the main control oil circuit 30 can directly act on the first rodless chamber 1101 to achieve damping adjustment. When the second reversing valve 80 is in the lower position, the port E is connected to the port H, the port F is connected to the port G, and the oil flowing out in one direction through the main control oil circuit 30 can directly act on the first rodless chamber 1102 to perform damping adjustment.

[0058] Furthermore, the second reversing valve 80 also has a neutral position. When the second reversing valve 80 is in the neutral position, both the port E and the port F are disconnected from the port G and the port H, that is, the second reversing valve 80 is in a closed state. At this time, the main control oil circuit 30 is disconnected from the first hydraulic cylinder 11, and the damping adjustment of the first hydraulic cylinder 11 is achieved via the corresponding first control circuit 40a and the piston damping valve 54 on the piston 52.

[0059] Furthermore, a fifth control valve 12 is provided between the first rodless chamber 1101 and the port F of the second reversing valve 80 , and the opening of the fifth control valve 12 is used to adjust the damping size to distribute the flow to the first control path 40 a or to the second reversing valve 80 .

[0060] For the second actuating oil circuit 20, the port E of the corresponding second reversing valve 80 is connected to one end of the second control circuit 40b and communicates with the rodless chamber, the port F is connected to the other end of the second control circuit 40b and communicates with the second rod chamber 2102, the port G is connected to the upstream interface 301, and the port H is connected to the downstream interface 302. The working principle of the second reversing valve 80 in the second actuating oil circuit 20 is basically similar to the above, and is used to adjust the main control oil circuit 30 to directly act on the second rodless chamber 2101 or the second rod chamber 2102, so it is not repeated here. In the second actuating oil circuit 20, a sixth control valve 22 is provided between the second rod chamber 2102 and the port F of the corresponding second reversing valve 80, which is also used to distribute the flow.

[0061] The fifth control valve 12 and the sixth control valve 22 are both variable throttle valves.

[0062] In addition, in this embodiment, the structure of the control circuit 40 corresponding to each hydraulic cylinder is basically similar to the above, so it is not repeated here.

[0063] See also Figure 2 , Figure 4 and Figure 6 In some other embodiments, a filter 91 may be provided between the rodless chamber of each hydraulic cylinder and the corresponding compression valve system 42, and between the rod chamber of each hydraulic cylinder and the corresponding recovery valve system 41, to filter impurities, iron filings, etc. in the oil. A stop valve 92 may also be provided on the side of the filter 91 away from the corresponding hydraulic cylinder to facilitate shutting off the oil circuit for maintenance, overhaul, and other operations. At the same time, a refueling port hydraulic lock 93 may also be provided to facilitate replenishing the oil. A pressure sensor 94 is provided between the recovery valve system 41 and the compression valve system 42 to detect the pressure difference between the rodless chamber and the rod chamber. The accumulator 43 may be connected to a charging valve 95 for inflation and pressure replenishment.

[0064] Another embodiment of the present application provides a vibration reduction device, including the above-mentioned hydraulic actuation system, which can be connected to the vehicle suspension to achieve vehicle vibration reduction. For example, the piston rod of the hydraulic cylinder in the hydraulic actuation system is connected to the vehicle body, and when the vehicle is driving on a bumpy road, the vibration reduction demand can be met, the response timeliness is improved, and thus the vibration reduction performance of the vibration reduction device is improved.

[0065] 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.

[0066] 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. A hydraulic actuation system, characterized in that: It comprises a first actuating oil circuit (10), a second actuating oil circuit (20) and a main control oil circuit (30); The main control oil circuit (30) has at least two groups of parallel connection ends, each of which comprises an upstream interface (301) and a downstream interface (302), wherein the upstream interface (301) and the downstream interface (302) of one group of the connection ends are respectively connected to the two ends of the first actuating oil circuit (10), and the upstream interface (301) and the downstream interface (302) of the other group of the connection ends are respectively connected to the two ends of the second actuating oil circuit (20); the main control oil circuit (30) comprises a one-way pump (311) and a first one-way valve (312), which are arranged in series between the upstream interface (301) and the downstream interface (302); The hydraulic actuation system has a first state and a second state; In the first state, the main control oil circuit (30) is connected to the first actuating oil circuit (10), and / or the main control oil circuit (30) is connected to the second actuating oil circuit (20); in the second state, the first actuating oil circuit (10) and the second actuating oil circuit (20) are connected via the main control oil circuit (30).

2. The hydraulic actuation system according to claim 1, characterized in that: The main control oil circuit (30) comprises a first hydraulic pump circuit (31a) and a second hydraulic pump circuit (31b), which are connected in parallel and have opposite flow directions, wherein both ends of the first hydraulic pump circuit (31a) are first connection ends (32), and both ends of the second hydraulic pump circuit (31b) are second connection ends (33); The first hydraulic pump circuit (31a) and the second hydraulic pump circuit (31b) can selectively connect to the first actuating oil circuit (10); and / or the first hydraulic pump circuit (31a) and the second hydraulic pump circuit (31b) can selectively connect to the second actuating oil circuit (20).

3. The hydraulic actuation system according to claim 2, characterized in that: The hydraulic actuation system further comprises a control valve group (60), wherein the control valve group (60) comprises a plurality of control valves (61), wherein the plurality of control valves (61) are arranged between the first actuation oil circuit (10) and the first hydraulic pump circuit (31a), and between the second actuation oil circuit (20) and the second hydraulic pump circuit (31b).

4. The hydraulic actuation system according to claim 3, characterized in that: The control valve (61) is respectively provided at each of the upstream interfaces (301) and each of the downstream interfaces (302).

5. The hydraulic actuation system according to claim 4, characterized in that: The first actuating oil circuit (10) comprises a first hydraulic cylinder (11) having a first rodless chamber (1101) and a first rod chamber (1102); the second actuating oil circuit (20) comprises a second hydraulic cylinder (21) having a second rodless chamber (2101) and a second rod chamber (2102); At least two groups of connection ends are respectively a first connection end (32) and a second connection end (33); among the plurality of control valves (61), the first control valve (611) and the second control valve (612) correspond to the first connection end (32), and the third control valve (613) and the fourth control valve (614) correspond to the second connection end (33); In the second state, the first control valve (611) and the third control valve (613) can be opened simultaneously to connect the first rod-containing chamber (1102) and the second rodless chamber (2101); and / or the second control valve (612) and the fourth control valve (614) can be opened simultaneously to connect the first rodless chamber (1101) and the second rod-containing chamber (2102).

6. The hydraulic actuation system according to claim 3, characterized in that: The first actuating oil circuit (10) and the second actuating oil circuit (20) both comprise a hydraulic cylinder having a rodless cavity and a rod cavity and a control circuit (40), and both ends of each control circuit (40) are respectively connected to the corresponding rodless cavity and the rod cavity, and are connected in parallel with the main control oil circuit (30); The control valve assembly (60) further includes a first reversing valve (62); One of the upstream interface (301) and the downstream interface (302) of the same connection end is provided with the first reversing valve (62), and the other is provided with the control valve (61), and each of the first reversing valves (62) is used to adjust the corresponding control circuit (40) and the main control oil circuit (30) to select one to connect to the corresponding hydraulic cylinder.

7. The hydraulic actuation system according to claim 6, characterized in that: Each of the first reversing valves (62) has a port A, a port B and a port C, and either the port B or the port C can be selectively connected to the port A; The port A is connected to the corresponding rodless cavity or the rod cavity, the port B is connected to the corresponding control path (40), and the port C is connected to the main control oil path (30).

8. The hydraulic actuation system according to claim 1, characterized in that: The hydraulic actuation system further comprises a second reversing valve (80); The second reversing valve (80) is provided between the first actuating oil circuit (10) and the main control oil circuit (30), and between the second actuating oil circuit (20) and the main control oil circuit (30); The first actuating oil circuit (10) and the second actuating oil circuit (20) both comprise a hydraulic cylinder having a rodless chamber and a rod chamber, and the second reversing valve (80) is used to adjust one of the rodless chamber and the rod chamber to connect to the upstream interface (301) and the other to connect to the downstream interface (302).

9. The hydraulic actuation system according to claim 2 or claim 8, characterized in that: The first actuating oil circuit (10) and the second actuating oil circuit (20) both comprise a hydraulic cylinder, a restoring valve system (41) and a compression valve system (42), each of the restoring valve systems (41) being connected to a rod chamber of a corresponding hydraulic cylinder, and each of the compression valve systems (42) being connected to a rodless chamber of a corresponding hydraulic cylinder; The restoring valve system (41) is connected to the corresponding compression valve system (42) to define a control path (40), and the control path (40) is connected in parallel with the main control oil path (30).

10. The hydraulic actuation system according to claim 9, characterized in that: The first actuating oil circuit (10) and the second actuating oil circuit (20) further include an accumulator (43), each of the accumulators (43) being connected to the corresponding control circuit (40) and having an access point, and the restoring valve system (41) and the compression valve system (42) being arranged on both sides of the corresponding access point.

11. The hydraulic actuation system according to claim 2 or claim 8, characterized in that: The first actuating oil circuit (10) and the second actuating oil circuit (20) both comprise a hydraulic cylinder; The hydraulic cylinder comprises at least a cylinder body (51) having a cavity and a piston (52) slidably arranged in the cavity, the piston (52) dividing the cavity into a rodless cavity and a rod cavity, and the piston (52) is provided with a piston damping valve (54) and / or a piston bypass valve (55) connecting the rodless cavity and the rod cavity.

12. A vibration reduction device, characterized in that: The vibration reduction device comprises the hydraulic actuation system according to any one of claims 1 to 10.

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