Hollow type full-active vibration reduction system

Abstract

The utility model relates to the technical field of automobiles, in particular to a hollow type full-active damping system which comprises a damper body, a two-way hydraulic pump and a driving motor, the damper body comprises a working cylinder cavity and a middle cylinder cavity arranged outside the working cylinder cavity in a sleeved mode, and a piston rod is arranged in the working cylinder cavity. The piston rod divides the working cylinder cavity into a first hydraulic cavity and a second hydraulic cavity, a runner is formed between the middle cylinder cavity and the working cylinder cavity, and the first hydraulic cavity is provided with an oil hole communicated with the runner; an output shaft of the driving motor is a hollow shaft, a pump shaft of the bidirectional hydraulic pump is a hollow pump shaft, the outer diameter of the hollow pump shaft is smaller than the inner diameter of the hollow shaft, the hollow shaft is in driving connection with the hollow pump shaft, and the middle cylinder cavity is fixed in the hollow shaft and the hollow pump shaft through bearings. And a first oil port and a second oil port of the two-way hydraulic pump are respectively communicated with the flow channel and the second hydraulic cavity. The shock absorber body, the driving motor and the hydraulic pump are integrated together, and the defects that a full-active shock absorption system occupies space in installation and is not flexible in arrangement are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a hollow full-active vibration reduction system. Background Art

[0002] With the further development of autonomous driving technology, higher requirements are being placed on vehicle comfort, and fully active suspension control technology is gaining increasing attention. Fully active suspension control technology can actively adjust the vehicle's posture to meet the stringent requirements for vehicle comfort.

[0003] Currently, existing fully active vibration reduction systems for automobiles typically include a shock absorber body, a bidirectional hydraulic pump, and a drive unit. The bidirectional hydraulic pump is driven by the drive unit. The shock absorber body includes a working cylinder chamber, in which a piston rod for adjusting the vehicle's posture is provided. The piston rod divides the working cylinder chamber into a first hydraulic chamber and a second hydraulic chamber. The two oil ports of the bidirectional hydraulic pump are connected to the first hydraulic chamber and the second hydraulic chamber, respectively. However, in the prior art, the shock absorber body, bidirectional hydraulic pump, and drive unit of the fully active vibration reduction system for automobiles are separately arranged, making it impossible to integrate the shock absorber body, drive unit, and hydraulic pump together. This results in the installation of the fully active vibration reduction system for automobiles taking up space and making its layout inflexible. For example, in the fully active suspension system and its applied logistics vehicle disclosed in the existing patent announcement number CN109606053B, its power cylinder (shock absorber body) and gear pump (hydraulic pump) are separately arranged, resulting in it taking up space during installation. Utility Model Content

[0004] One of the purposes of the utility model is to provide a hollow fully active vibration reduction system, which aims to solve the technical problem that the shock absorber body, bidirectional hydraulic pump and drive unit of the existing automobile fully active vibration reduction system are separate structures, making it impossible to integrate the shock absorber body, drive unit and hydraulic pump together, thereby resulting in the installation of the automobile fully active vibration reduction system taking up space and inflexible layout.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a hollow fully active vibration reduction system, including a shock absorber body, a bidirectional hydraulic pump and a drive unit, the shock absorber body includes a working cylinder cavity, a piston rod for adjusting the posture of the car is provided in the working cylinder cavity, and the piston rod divides the working cylinder cavity into a first hydraulic cavity and a second hydraulic cavity; the shock absorber body also includes an intermediate cylinder cavity sleeved outside the working cylinder cavity, a flow channel is formed between the intermediate cylinder cavity and the working cylinder cavity, and a plurality of channels communicating with the flow channel are provided on the wall surface of the first hydraulic cavity. Oil hole; the driving unit is a driving motor, the output shaft of the driving motor is a hollow shaft, the pump shaft of the bidirectional hydraulic pump is a hollow pump shaft, the outer diameter of the hollow pump shaft is smaller than the inner diameter of the hollow shaft, the hollow shaft is drivingly connected to the hollow pump shaft, the intermediate cylinder cavity is fixed in the hollow shaft and the hollow pump shaft by a bearing, the inner ring of the bearing is fixed to the outer wall of the intermediate cylinder cavity, the outer ring of the bearing rotates with the hollow shaft and the hollow pump shaft, the first oil port and the second oil port of the bidirectional hydraulic pump are respectively connected to the flow channel and the second hydraulic cavity.

[0006] Furthermore, the hollow fully active vibration reduction system of the present invention also includes a built-in solenoid valve, which is arranged in the piston rod. The built-in solenoid valve controls whether the first hydraulic chamber and the second hydraulic chamber are connected or the opening size of the connection between the first hydraulic chamber and the second hydraulic chamber by adjusting the opening degree of its own valve port.

[0007] Furthermore, the hollow fully active vibration reduction system of the present invention also includes an external solenoid valve, the oil circuit connecting the first oil port of the bidirectional hydraulic pump and the flow channel is the first oil circuit, the oil circuit connecting the second oil port of the bidirectional hydraulic pump and the second hydraulic chamber is the second oil circuit, the external solenoid valve is connected in parallel between the first oil circuit and the second oil circuit, the external solenoid valve includes a compression solenoid valve and a restoration solenoid valve, the compression solenoid valve is connected in parallel with the second oil circuit, the restoration solenoid valve is connected in parallel with the first oil circuit, and the restoration solenoid valve is connected in series with the compression solenoid valve.

[0008] Furthermore, an accumulator is connected in parallel to the oil circuit connecting the restoration solenoid valve and the compression solenoid valve.

[0009] Furthermore, the external solenoid valve is fixed on the outer wall of the working cylinder cavity.

[0010] Furthermore, a first pressure sensor is provided in the first oil circuit for detecting the oil pressure in the first oil circuit.

[0011] Furthermore, a second pressure sensor is provided in the second oil circuit for detecting the oil pressure in the second oil circuit.

[0012] Furthermore, the hollow fully active vibration reduction system of the present invention further includes a first safety valve, an oil inlet of the first safety valve is connected to the first oil circuit, and an oil outlet of the first safety valve is connected to the second oil circuit.

[0013] Furthermore, the hollow fully active vibration reduction system of the present invention further includes a second safety valve, an oil inlet of the second safety valve is connected to the second oil circuit, and an oil outlet of the second safety valve is connected to the first oil circuit.

[0014] Furthermore, a rotation speed sensor is installed on the driving motor to detect the rotation speed of the hollow shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The hollow fully active vibration reduction system of the present invention sets the output shaft of the driving motor as a hollow shaft, and sets the pump shaft of the bidirectional hydraulic pump as a hollow pump shaft. Since the outer diameter of the hollow pump shaft is smaller than the inner diameter of the hollow shaft, the hollow pump shaft is inserted into the hollow shaft and the two are driven and connected, thereby completing the driving connection between the driving motor and the bidirectional hydraulic pump; on this basis, the working cylinder cavity of the shock absorber body is inserted into the hollow shaft and the hollow pump shaft, and the working cylinder cavity is fixed in the hollow shaft and the hollow pump shaft by a bearing. Since the inner ring of the bearing is fixed to the outer wall of the middle cylinder cavity, the outer ring of the bearing rotates with the hollow shaft and the hollow pump shaft. Therefore, the hollow shaft driving the hollow pump shaft to rotate will not generate driving force on the shock absorber body, thereby avoiding the rotation of the hollow shaft or the hollow pump shaft driving the shock absorber body to rotate. In addition, since a flow channel is formed between the outer wall of the working cylinder cavity and the inner wall of the intermediate cylinder cavity, the first oil port and the second oil port of the two-way hydraulic pump are connected to the flow channel and the second hydraulic cavity respectively. Therefore, when the piston rod is actively damped and adjusted, when the piston rod is compressed, the hydraulic oil in the second hydraulic cavity enters the two-way hydraulic pump, and then enters the first hydraulic cavity through the flow channel formed between the outer wall of the working cylinder cavity and the inner wall of the intermediate cylinder cavity; when the piston rod is restored (restoration refers to the process of the piston rod rising or the process of the piston rod returning to its original position after the compression process), the hydraulic oil in the first hydraulic cavity enters the flow channel through the oil hole and then enters the two-way hydraulic pump, and finally enters the second hydraulic cavity.

[0017] In summary, the hollow fully active vibration reduction system of the utility model integrates the shock absorber body, the drive unit and the bidirectional hydraulic pump while ensuring that the piston rod can be actively damped and adjusted, thereby avoiding the defects of the fully active vibration reduction system in that the installation takes up space and the layout is inflexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of the connection between the drive unit, the bidirectional hydraulic pump and the shock absorber body of the embodiment;

[0019] Figure 2This is a working principle diagram of the hollow full-active vibration reduction system of the utility model;

[0020] Figure 3 This is a working principle diagram of a vibration reduction system when the solenoid valve assembly adopts a built-in solenoid valve.

[0021] Reference numerals in the accompanying drawings:

[0022] 1. Shock absorber body; 10. Working cylinder chamber; 100. Piston rod; 101. First hydraulic chamber; 102. Second hydraulic chamber; 103. Oil hole; 11. Intermediate cylinder chamber; 12. Flow channel; 2. Drive motor; 20. Hollow shaft; 3. Bidirectional hydraulic pump; 30. Hollow pump shaft; 31. First oil circuit; 32. Second oil circuit; 4. Solenoid valve assembly; 40. Restoring solenoid valve; 41. Compression solenoid valve; 5. Accumulator; 6. First pressure sensor; 61. Second pressure sensor; 7. First safety valve; 70. Second safety valve; 8. Built-in solenoid valve. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] In the description of the present invention, it should be understood that the terms "width", "up", "down", "front", "back", "top", "bottom", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] Please refer to Figure 1 - Figure 3 The present invention provides a hollow fully active vibration reduction system, comprising a shock absorber body 1, a bidirectional hydraulic pump 3, and a drive unit. The shock absorber body 1 comprises a working cylinder chamber 10 and an intermediate cylinder chamber 11. A piston rod 100 for adjusting the vehicle's posture is provided in the working cylinder chamber 10. The piston rod 100 divides the working cylinder chamber 10 into a first hydraulic chamber 101 and a second hydraulic chamber 102. The intermediate cylinder chamber 11 is sleeved outside the working cylinder chamber 10. A flow channel 12 is formed between the inner wall of the intermediate cylinder chamber 11 and the outer wall of the working cylinder chamber 10. A plurality of oil holes 103 communicating with the flow channel 12 are provided on the wall surface of the first hydraulic chamber 101, so that the hydraulic oil in the first hydraulic chamber 101 can enter the flow channel 12 through the oil holes 103, and the hydraulic oil in the flow channel 12 can enter the first hydraulic chamber 101 through the oil holes 103.

[0028] The drive unit is a drive motor 2, whose output shaft is a hollow shaft 20. A speed sensor is also mounted on the drive motor 2 to detect the speed of the hollow shaft 20. The pump shaft of the bidirectional hydraulic pump 3 is a hollow pump shaft 30, whose outer diameter is smaller than the inner diameter of the hollow shaft 20. The hollow shaft 20 and the hollow pump shaft 30 are drivingly connected. The intermediate cylinder chamber 11 is fixed within the hollow shaft 20 and the hollow pump shaft 30 via bearings. The inner ring of the bearing is fixed to the outer wall of the intermediate cylinder chamber 11, and the outer ring of the bearing rotates with the hollow shaft 20 and the hollow pump shaft 30. The first and second oil ports of the bidirectional hydraulic pump 3 are connected to the flow channel 12 and the second hydraulic chamber 102, respectively.

[0029] The hollow fully active vibration reduction system of the present invention sets the output shaft of the drive motor 2 as a hollow shaft 20, and sets the pump shaft of the bidirectional hydraulic pump 3 as a hollow pump shaft 30. Since the outer diameter of the hollow pump shaft 30 is smaller than the inner diameter of the hollow shaft 20, the hollow pump shaft 30 is inserted into the hollow shaft 20 and the two are driven and connected, thereby completing the drive connection between the drive motor 2 and the bidirectional hydraulic pump 3; on this basis, the working cylinder cavity 10 of the shock absorber body 1 is inserted into the hollow shaft 20 and the hollow pump shaft 30, and the working cylinder cavity 10 is fixed in the hollow shaft 20 and the hollow pump shaft 30 by a bearing. Since the inner ring of the bearing is fixed to the outer wall of the intermediate cylinder cavity 11, the outer ring of the bearing rotates with the hollow shaft 20 and the hollow pump shaft 30. Therefore, the hollow shaft 20 driving the hollow pump shaft 30 to rotate will not generate driving force on the shock absorber body 1, thereby avoiding the rotation of the hollow shaft 20 or the hollow pump shaft 30 driving the shock absorber body 1 to rotate. In addition, since a flow channel 12 is formed between the outer wall of the working cylinder chamber 10 and the inner wall of the intermediate cylinder chamber 11, the first oil port and the second oil port of the bidirectional hydraulic pump 3 are connected to the flow channel 12 and the second hydraulic chamber 102 respectively. Therefore, when the piston rod 100 is actively damped and adjusted, when the piston rod 100 is compressed, the hydraulic oil in the second hydraulic chamber 102 enters the bidirectional hydraulic pump 3, and then enters the first hydraulic chamber 101 through the flow channel 12 formed between the outer wall of the working cylinder chamber 10 and the inner wall of the intermediate cylinder chamber 11; when the piston rod 100 is restored (restoration refers to the process of the piston rod 100 rising or the process of the piston rod 100 returning to its original position after the compression process), the hydraulic oil in the first hydraulic chamber 101 enters the flow channel 12 through the oil hole 103 and then enters the bidirectional hydraulic pump 3, and finally enters the second hydraulic chamber 102.

[0030] In summary, the hollow fully active vibration reduction system of the present invention integrates the shock absorber body 1, the drive unit and the bidirectional hydraulic pump 3 while ensuring that the piston rod 100 can be actively damped and adjusted, thereby avoiding the defects of the fully active vibration reduction system occupying space during installation and having an inflexible layout.

[0031] In this embodiment, the hollow fully active vibration damping system of the present invention further includes a solenoid valve assembly 4, which utilizes an external solenoid valve. The external solenoid valve includes a compression solenoid valve 41 and a restoration solenoid valve 40. The oil circuit connecting the first oil port of the bidirectional hydraulic pump 3 and the flow channel 12 is set as the first oil circuit 31, and the oil circuit connecting the second oil port of the bidirectional hydraulic pump 3 and the second hydraulic chamber 102 is set as the second oil circuit 32. The external solenoid valves are connected in parallel between the first oil circuit 31 and the second oil circuit 32, that is, the compression solenoid valve 41 is connected in parallel with the second oil circuit 32, the restoration solenoid valve 40 is connected in parallel with the first oil circuit 31, and the compression solenoid valve 41 is connected in series with the restoration solenoid valve 40. Furthermore, an accumulator 5 is connected in parallel to the oil circuit connecting the restoration solenoid valve and the compression solenoid valve 41.

[0032] It can be seen that in the first working condition, when the piston rod 100 of the shock absorber is passively damped, that is, when the shock absorber piston rod 100 is passively compressed or restored due to the bumps of the road while the car is driving (the process in which the piston rod 100 rises or the process in which the piston rod 100 returns to its original position after the compression process), the bidirectional hydraulic pump 3 does not work, the restoration solenoid valve 40 and the compression solenoid valve 41 are energized and work, when the piston rod 100 is passively compressed, the hydraulic oil in the second hydraulic chamber 102 is passed through After entering the compression solenoid valve 41 through the second oil circuit 32, a part of the oil enters the accumulator 5, and the other part enters the restoration solenoid valve 40 and then flows back to the flow channel 12, and finally enters the first hydraulic chamber 101; when the piston rod 100 is restored, the oil in the first hydraulic chamber 101 enters the first oil circuit 31 through the flow channel 12 and then enters the restoration solenoid valve 40, and then merges with the hydraulic oil in the accumulator 5 and flows back to the second hydraulic chamber 102. This cycle can realize the passive damping adjustment function of the piston rod 100 of the shock absorber.

[0033] In the second working condition, when the car is not moving, if the piston rod 100 of the shock absorber is actively adjusted, the two-way hydraulic pump 3 works. In this working condition, when the piston rod 100 of the shock absorber is actively lowered, the hydraulic oil enters the first oil circuit 31 from the two-way hydraulic pump 3, then enters the flow channel 12, and then enters the first hydraulic chamber 101. At the same time, the compression solenoid valve 41 is opened. At this time, the oil inlet valve port of the compression solenoid valve 41 is connected to the second oil circuit 32, so that the hydraulic oil in the second hydraulic chamber 102 enters the second oil circuit 32. After that, one path of hydraulic oil enters the accumulator 5 through the compression solenoid valve 41 to store energy, and the other path of hydraulic oil flows back to the two-way hydraulic pump 3, thereby realizing the active lowering of the car body posture. When the shock absorber When the piston rod 100 of the accumulator is actively lifted, the hydraulic oil enters the second oil circuit 32 from the two-way hydraulic pump 3 and then enters the second hydraulic chamber 102. The hydraulic oil in the first hydraulic chamber 101 enters the first oil circuit 31 through the flow channel 12 and flows back to the two-way hydraulic pump 3. At this time, the restoration solenoid valve 40 and the compression solenoid valve 41 are not energized. Since the oil pressure of the oil stored in the accumulator 5 is greater than the oil pressure coming out of the first hydraulic chamber 101, the oil coming out of the accumulator 5 forces the one-way valve of the restoration solenoid valve 40 to open. At this time, the oil coming out of the accumulator 5 will enter the first oil circuit 31 to compensate for the oil pressure in the first oil circuit 31, thereby realizing active lifting of the vehicle body posture.

[0034] In the third working condition, when the car is driving, if the piston rod 100 of the shock absorber is actively adjusted, the two-way hydraulic pump 3 works. When the piston rod 100 of the shock absorber is actively lowered, the hydraulic oil enters the first oil path 31 from the two-way hydraulic pump 3, then enters the flow channel 12, and then enters the first hydraulic chamber 101. At the same time, the compression solenoid valve 41 is opened. At this time, the oil inlet valve port of the compression solenoid valve 41 is connected to the second oil path 32, so that the hydraulic oil in the second hydraulic chamber 102 enters the second oil path 32, and the hydraulic oil enters the second hydraulic chamber 102 through the compression solenoid valve 41. Energy is stored in the accumulator 5, and the hydraulic oil flows back to the two-way hydraulic pump 3, thereby realizing the active descent of the vehicle body posture; when the piston rod 100 of the shock absorber is restored, the hydraulic oil enters the second oil circuit 32 from the two-way hydraulic pump 3, and then enters the second hydraulic chamber 102. The hydraulic oil in the first hydraulic chamber 101 flows back to the two-way hydraulic pump 3 through the first oil circuit 31, and the hydraulic oil stored in the accumulator 5 enters the first oil circuit 31 through the restoration solenoid valve 40, and flows back to the two-way hydraulic pump 3 after merging, thereby realizing the active restoration of the vehicle body posture.

[0035] It should be noted that, under the third working condition, by adjusting the valve opening degree of the restoration solenoid valve 40 (the valve opening degree of the restoration solenoid valve 40 is controlled by the current size of the restoration solenoid valve 40), the damping force of the compression process of the piston rod 100 is adjusted, and by adjusting the valve opening degree of the compression solenoid valve 41 (the valve opening degree of the compression solenoid valve 41 is controlled by the current size of the compression solenoid valve 41), the damping force of the restoration process of the piston rod 100 is adjusted. Specifically, during the compression process of the piston rod 100, if the vibration velocity of the vehicle body is low, the damping force of the shock absorber required by the vehicle suspension is small, and the shock absorber needs to provide a small damping force to achieve better comfort. In this case, the valve port opening of the return solenoid valve 40 is increased to reduce the oil pressure of the hydraulic oil entering the first hydraulic chamber 101, so that the damping during the descent process of the piston rod 100 is small, thereby making the vehicle suspension softer and achieving good vehicle comfort. When the amplitude of the vehicle body is large, the damping force of the shock absorber required by the vehicle suspension is large, and the shock absorber needs to provide a large damping force to achieve good handling stability. In this case, the opening of the oil inlet valve port of the return solenoid valve 40 is reduced or closed, and the oil pressure of the hydraulic oil entering the first hydraulic chamber 101 is increased, so that the damping during the compression process of the piston rod 100 is large, thereby making the vehicle suspension stiffer and enabling the shock absorber to provide a large damping value. In this way, the vibration of the vehicle can be quickly attenuated, improving the vehicle's stability in cornering, maneuverability in narrow roads, or stability when reversing on a slope.

[0036] Similarly, during the recovery process of the piston rod 100, if the vibration speed of the vehicle body is relatively small, the valve opening of the compression solenoid valve 41 is increased, so that the damping of the recovery process of the piston rod 100 is relatively small, thereby making the suspension of the vehicle softer and making the vehicle more comfortable; when the amplitude of the vehicle body is relatively large, the valve opening of the compression solenoid valve 41 is reduced or closed, so that the damping of the recovery process of the piston rod 100 is relatively large, so that the shock absorber can provide a larger damping value, thereby quickly attenuating the vibration of the vehicle and improving the vehicle's cornering stability, narrow road maneuverability or stability of reversing on a slope.

[0037] Of course, in other embodiments, reference Figure 3 The solenoid valve assembly 4 may also use a built-in solenoid valve 8. When the built-in solenoid valve 8 is used, the built-in solenoid valve 8 is fixed inside the piston rod 100. By adjusting the opening of the valve port of the built-in solenoid valve 8, whether the first hydraulic chamber 101 and the second hydraulic chamber 102 are connected or the opening size of the connection between the first hydraulic chamber 101 and the second hydraulic chamber 102 is controlled. In other words, it can be understood that when the first hydraulic chamber 101 and the second hydraulic chamber 102 need to be connected, the built-in solenoid valve 8 can be energized. The energization of the built-in solenoid valve 8 can open the opening of its valve port, thereby connecting the first hydraulic chamber 101 and the second hydraulic chamber 102; wherein, the valve port opening of the built-in solenoid valve 8 is determined by the current controlling the solenoid valve. For example, the built-in solenoid valve 8 is a proportional valve. The greater the current, the greater the valve opening of the built-in solenoid valve 8, and the smaller the current, the smaller the valve opening of the built-in solenoid valve 8. The built-in solenoid valve 8 is an inversely proportional valve. The greater the current, the smaller the valve opening of the built-in solenoid valve 8, and the smaller the current, the larger the valve opening of the built-in solenoid valve 8. In summary, by controlling the valve opening of the built-in solenoid valve 8, the degree of communication between the first hydraulic chamber 101 and the second hydraulic chamber 102 can be controlled, thereby adjusting the damping force during the piston push rod's ascent or descent.

[0038] In this embodiment, the external solenoid valve can be fixed to the outer wall of the working cylinder chamber 10, integrating the external solenoid valve with the shock absorber body 1, further increasing the installation space of the vibration reduction system. Of course, in other embodiments, the external solenoid valve can also be fixed to the valve block, which is not limited here, as long as the external solenoid valve is connected to the first oil passage 31 and the second oil passage 32.

[0039] Based on the above structure, the fully active vibration reduction system of the present invention further includes a first pressure sensor 6, a second pressure sensor 61, a first safety valve 7, and a second safety valve 70. The first pressure sensor 6 is disposed in the first oil circuit 31 and is used to detect the oil pressure within the first oil circuit 31. The second pressure sensor 61 is disposed in the second oil circuit 32 and is used to detect the oil pressure within the second oil circuit 32. The oil inlet of the first safety valve 7 is connected to the first oil circuit 31, and the oil outlet of the first safety valve 7 is connected to the second oil circuit 32. The oil inlet of the second safety valve 70 is connected to the second oil circuit 32, and the oil outlet of the second safety valve 70 is connected to the first oil circuit 31. When the oil pressure of the hydraulic oil entering the first hydraulic chamber 101 from the first oil circuit 31 is greater than the preset threshold, the first safety valve 7 is activated to release the pressure of the oil in the first oil circuit 31, thereby playing a role of safety protection; when the oil pressure of the hydraulic oil entering the second hydraulic chamber 102 from the second oil circuit 32 is greater than the preset threshold, the second safety valve 70 is activated to release the pressure of the oil in the second oil circuit 32, thereby playing a role of safety protection.

[0040] It should be noted that the fully active vibration reduction system of the present invention adopts a standalone configuration. This means that each drive motor 2 independently drives a bidirectional hydraulic pump 3, independently providing flow and pressure to each shock absorber. This standalone fully active vibration reduction system can use a single driver to simultaneously drive two drive motors 2, controlled by a control system.

[0041] In addition, those skilled in the art can flexibly design the outer diameter and height of the drive motor 2 and the bidirectional hydraulic pump 3 according to user needs to meet the layout requirements.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A hollow fully active vibration reduction system comprising a shock absorber body, a bidirectional hydraulic pump, and a drive unit. The shock absorber body comprises a working cylinder chamber, in which a piston rod for adjusting the vehicle's posture is disposed. The piston rod divides the working cylinder chamber into a first hydraulic chamber and a second hydraulic chamber. The system is characterized in that: The shock absorber body also includes an intermediate cylinder cavity arranged outside the working cylinder cavity, a flow channel is formed between the intermediate cylinder cavity and the working cylinder cavity, and a plurality of oil holes connected to the flow channel are opened on the wall surface of the first hydraulic cavity; the driving unit is a driving motor, the output shaft of the driving motor is a hollow shaft, the pump shaft of the bidirectional hydraulic pump is a hollow pump shaft, the outer diameter of the hollow pump shaft is smaller than the inner diameter of the hollow shaft, the hollow shaft is driven and connected to the hollow pump shaft, the intermediate cylinder cavity is fixed in the hollow shaft and the hollow pump shaft by a bearing, the inner ring of the bearing is fixed to the outer wall of the intermediate cylinder cavity, the outer ring of the bearing rotates with the hollow shaft and the hollow pump shaft, the first oil port and the second oil port of the bidirectional hydraulic pump are respectively connected to the flow channel and the second hydraulic cavity.

2. The hollow fully active vibration reduction system according to claim 1, characterized in that: It also includes a built-in solenoid valve, which is arranged in the piston rod. The built-in solenoid valve controls whether the first hydraulic chamber and the second hydraulic chamber are connected or the opening size of the connection between the first hydraulic chamber and the second hydraulic chamber by adjusting the opening degree of its own valve port.

3. The hollow fully active vibration reduction system according to claim 1, characterized in that: It also includes an external solenoid valve, the oil circuit connecting the first oil port of the bidirectional hydraulic pump and the flow channel is the first oil circuit, the oil circuit connecting the second oil port of the bidirectional hydraulic pump and the second hydraulic chamber is the second oil circuit, the external solenoid valve is connected in parallel between the first oil circuit and the second oil circuit, the external solenoid valve includes a compression solenoid valve and a restoration solenoid valve, the compression solenoid valve is connected in parallel with the second oil circuit, the restoration solenoid valve is connected in parallel with the first oil circuit, and the restoration solenoid valve is connected in series with the compression solenoid valve.

4. The hollow fully active vibration reduction system according to claim 3, characterized in that: An accumulator is connected in parallel to the oil path connecting the restoration solenoid valve and the compression solenoid valve.

5. The hollow fully active vibration reduction system according to claim 3, characterized in that: The external solenoid valve is fixed on the outer wall of the working cylinder cavity.

6. The hollow fully active vibration reduction system according to claim 3, characterized in that: The first oil circuit is further provided with a first pressure sensor for detecting the oil pressure in the first oil circuit.

7. The hollow fully active vibration reduction system according to claim 3, characterized in that: The second oil circuit is further provided with a second pressure sensor for detecting the oil pressure in the second oil circuit.

8. The hollow fully active vibration reduction system according to claim 3, characterized in that: The oil inlet of the first safety valve is connected to the first oil circuit, and the oil outlet of the first safety valve is connected to the second oil circuit.

9. The hollow fully active vibration reduction system according to claim 3, characterized in that: A second safety valve is further included, wherein the oil inlet of the second safety valve is communicated with the second oil circuit, and the oil outlet of the second safety valve is communicated with the first oil circuit.

10. The hollow fully active vibration reduction system according to claim 1, characterized in that: A rotation speed sensor is installed on the driving motor to detect the rotation speed of the hollow shaft.

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