Hollow type full-active vibration reduction system

Abstract

The invention relates to the technical field of automobiles, in particular to a hollow type full-active damping system which comprises a damper body, a bidirectional 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 sleeving 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 invention relates to the field of automobile technology, and in particular to a hollow full-active vibration reduction system. Background Art

[0002] With the further development of autonomous driving technology, higher requirements are placed on vehicle comfort, and full active suspension control technology has received more and more attention. Among them, full active suspension control technology can realize active adjustment of vehicle body posture to meet the stringent requirements for vehicle comfort.

[0003] At present, the existing fully active shock absorption system for automobiles usually includes a shock absorber body, a two-way hydraulic pump and a drive unit. The two-way hydraulic pump is driven by the drive unit. The shock absorber body includes a working cylinder chamber. A piston rod for adjusting the posture of the automobile is provided in the working cylinder chamber. The piston rod divides the working cylinder chamber into a first hydraulic chamber and a second hydraulic chamber. The two oil ports of the two-way hydraulic pump are respectively connected to the first hydraulic chamber and the second hydraulic chamber. However, in the prior art, the shock absorber body, the two-way hydraulic pump and the drive unit of the fully active shock absorption system for automobiles are separately arranged, so that the shock absorber body, the drive unit and the hydraulic pump cannot be integrated together, resulting in the installation of the fully active shock absorption system for automobiles occupying space and inflexible arrangement. For example, the existing patent announcement number CN109606053B discloses a fully active suspension system and a logistics vehicle using the same, in which the power cylinder (shock absorber body) and the gear pump (hydraulic pump) are separately arranged, resulting in the space occupied during installation. Summary of the invention

[0004] One of the purposes of the present invention 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 occupying space and inflexible layout.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a hollow full-active vibration reduction system, including a shock absorber body, a bidirectional hydraulic pump and a drive unit, wherein the shock absorber body includes a working cylinder chamber, wherein a piston rod for adjusting the posture of a vehicle is arranged in the working cylinder chamber, wherein the piston rod divides the working cylinder chamber into a first hydraulic chamber and a second hydraulic chamber; the shock absorber body also includes an intermediate cylinder chamber sleeved outside the working cylinder chamber, wherein a flow channel is formed between the intermediate cylinder chamber and the working cylinder chamber, wherein a plurality of oil channels communicating with the flow channel are provided on the wall surface of the first hydraulic chamber 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, and 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 restoring solenoid valve, the compression solenoid valve is connected in parallel with the second oil circuit, the restoring solenoid valve is connected in parallel with the first oil circuit, and the restoring 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 recovery 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 full-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 full-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 driving connection between the driving motor and the bidirectional hydraulic pump can be completed by inserting the hollow pump shaft into the hollow shaft and driving the two together. 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 rotation of the hollow pump shaft driven by the hollow shaft will not generate driving force for 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 chamber and the inner wall of the intermediate cylinder chamber, 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 chamber respectively. Therefore, when the piston rod is actively damped and adjusted, when the piston rod is compressed, the hydraulic oil in the second hydraulic chamber enters the two-way hydraulic pump, and then enters the first hydraulic chamber through the flow channel formed between the outer wall of the working cylinder chamber and the inner wall of the intermediate cylinder chamber; 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 chamber enters the flow channel through the oil hole and then enters the two-way hydraulic pump, and finally enters the second hydraulic chamber.

[0017] In summary, the hollow fully active vibration reduction system of the present invention 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 occupying space during installation and having an inflexible layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the drive unit, the bidirectional hydraulic pump and the shock absorber body connected in the embodiment;

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

[0020] Figure 3 The embodiment relates to 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. Restoration 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 used to limit the present invention.

[0024] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "width", "up", "down", "front", "back", "top" and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0027] Please refer to Figure 1 - Figure 3 The present invention provides a hollow full-active vibration reduction system, including a shock absorber body 1, a bidirectional hydraulic pump 3 and a driving unit. The shock absorber body 1 includes a working cylinder chamber 10 and an intermediate cylinder chamber 11. A piston rod 100 for adjusting the posture of a vehicle is arranged 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 opened 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, or the hydraulic oil in the flow channel 12 can enter the first hydraulic chamber 101 through the oil holes 103.

[0028] The driving unit is a driving motor 2, the output shaft of the driving motor 2 is a hollow shaft 20, and a speed sensor is also installed on the driving motor 2, and the speed sensor is used to detect the speed of the hollow shaft 20; the pump shaft of the bidirectional hydraulic pump 3 is a hollow pump shaft 30, the outer diameter of the hollow pump shaft 30 is smaller than the inner diameter of the hollow shaft 20, the hollow shaft 20 is drivingly connected with the hollow pump shaft 30, and the middle cylinder cavity 11 is fixed in the hollow shaft 20 and the hollow pump shaft 30 through a bearing. Among them, the inner ring of the bearing is fixed to the outer wall of the middle cylinder cavity 11, and the outer ring of the bearing rotates with the hollow shaft 20 and the hollow pump shaft 30, and the first oil port and the second oil port of the bidirectional hydraulic pump 3 are respectively connected with the flow channel 12 and the second hydraulic cavity 102.

[0029] The hollow fully active vibration reduction system of the present invention sets the output shaft of the driving motor 2 as the hollow shaft 20, and sets the pump shaft of the bidirectional hydraulic pump 3 as the 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 driving connection between the driving motor 2 and the bidirectional hydraulic pump 3 can be completed by inserting the hollow pump shaft 30 into the hollow shaft 20 and driving the two together. 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 bearings. Since the inner ring of the bearing is fixed to the outer wall of the middle 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 for 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 two-way hydraulic pump 3 are respectively connected to the flow channel 12 and the second hydraulic chamber 102. 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 two-way 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 two-way 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 full-active vibration reduction system of the present invention also includes a solenoid valve assembly 4, and the solenoid valve assembly 4 adopts an external solenoid valve. Among them, the external solenoid valve includes a compression solenoid valve 41 and a restoration solenoid valve 40. Among them, the oil circuit connecting the first oil port of the two-way 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 two-way hydraulic pump 3 and the second hydraulic chamber 102 is set as the second oil circuit 32. The external solenoid valve is 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. In addition, 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 piston rod 100 of the shock absorber is passively compressed or restored due to the bumps of the road during 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 two-way hydraulic pump 3 does not work, the restoration solenoid valve 40 and the compression solenoid valve 41 are powered on, and when the piston rod 100 is passively compressed, the hydraulic oil in the second hydraulic chamber 102 is passed through the second hydraulic chamber 102. After entering the compression solenoid valve 41 through the second oil circuit 32, a part of it enters the accumulator 5, and the other part enters the recovery 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 recovery solenoid valve 40, and then merges with the hydraulic oil in the accumulator 5 and flows back to the second hydraulic chamber 102. In this cycle, the passive damping adjustment function of the piston rod 100 of the shock absorber can be realized.

[0033] In the second working condition, when the automobile 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 after the hydraulic oil in the second hydraulic chamber 102 enters the second oil circuit 32, one path of hydraulic oil enters the accumulator 5 through the compression solenoid valve 41 for energy storage, and one path of hydraulic oil flows back to the two-way hydraulic pump 3, so as to realize the active lowering of the automobile 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 restoring solenoid valve 40 and the compression solenoid valve 41 are not energized. Since the oil pressure of the oil after energy storage 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 restoring 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 the 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, and 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, and at the same time opens the compression solenoid valve 41. At this time, the oil inlet valve port of the compression solenoid valve 41 is connected to the second oil path 32, so that after the hydraulic oil in the second hydraulic chamber 102 enters the second oil path 32, 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 restoring solenoid valve 40 (the valve opening degree of the restoring solenoid valve 40 is controlled by the current of the restoring 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 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 speed of the vehicle body is relatively small, the damping force of the shock absorber required by the vehicle suspension is relatively small, and the shock absorber needs to provide a small damping force in order to obtain better comfort. At this time, the valve opening of the restoring solenoid valve 40 is increased, and the oil pressure of the hydraulic oil entering the first hydraulic chamber 101 is reduced, so that the damping of the piston rod 100 during the descent process is relatively small, thereby making the vehicle suspension softer, so that the vehicle obtains good comfort; when the amplitude of the vehicle body is relatively large, the damping force of the shock absorber required by the vehicle suspension is relatively large, and the shock absorber needs to provide a large damping force at this time to obtain good handling stability. At this time, the opening of the oil inlet valve port of the restoring 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 of the piston rod 100 during the compression process is relatively large, thereby making the vehicle suspension harder, and the shock absorber can provide a larger damping value, so that the vibration of the vehicle can be quickly attenuated, and the turning stability, narrow road maneuverability or slope reversing stability of the vehicle can be improved.

[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 providing good comfort for the vehicle; when the amplitude of the vehicle body is relatively large, the valve opening of the compression solenoid valve 41 is decreased 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 relatively large damping value, thereby quickly attenuating the vibration of the vehicle and improving the vehicle's turning stability, narrow road maneuverability or slope reversing stability.

[0037] Of course, in other embodiments, refer to 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 degree 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 degree of 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, and the energization of the built-in solenoid valve 8 can open the opening of its valve port, so that the first hydraulic chamber 101 and the second hydraulic chamber 102 are connected; wherein, the valve port opening degree of the built-in solenoid valve 8 is determined by the current controlling the solenoid valve. Exemplarily, the built-in solenoid valve 8 is a positive proportional valve, the greater the current, the greater the valve opening of the built-in solenoid valve 8, the smaller the current, the smaller the valve opening of the built-in solenoid valve 8; the built-in solenoid valve 8 is an inverse proportional valve, the greater the current, the smaller the valve opening of the built-in solenoid valve 8, the smaller the current, the greater 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 of the piston push rod during the ascent or descent process.

[0038] In this embodiment, the external solenoid valve can be fixed on the outer wall of the working cylinder chamber 10, so that the external solenoid valve is integrated 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 on the valve block, which is not limited here, as long as the external solenoid valve is connected to the first oil circuit 31 and the second oil circuit 32.

[0039] On the basis of 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 arranged on the first oil circuit 31 to detect the oil pressure in the first oil circuit 31; the second pressure sensor 61 is arranged on the second oil circuit 32 to detect the oil pressure in 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, which plays 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, which plays a role of safety protection.

[0040] It should be noted that the fully active vibration reduction system of the present invention adopts an independent configuration. The fully active vibration reduction system of the independent configuration means that each drive motor 2 independently drives a bidirectional hydraulic pump 3 to independently provide flow and pressure to each shock absorber. The fully active vibration reduction system of the independent configuration can use one driver to drive two drive motors 2 at the same time, and the driver is 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 present invention specification and drawings, 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 full-active vibration reduction system, comprising a shock absorber body, a bidirectional hydraulic pump and a drive unit, wherein the shock absorber body comprises a working cylinder chamber, wherein a piston rod for adjusting the posture of a vehicle is arranged in the working cylinder chamber, wherein the piston rod divides the working cylinder chamber into a first hydraulic chamber and a second hydraulic chamber, wherein the shock absorber body comprises a working cylinder chamber, wherein the working cylinder chamber comprises a first hydraulic chamber and a second hydraulic chamber, wherein the working cylinder chamber comprises a second hydraulic chamber and a second hydraulic chamber, wherein the first hydraulic ... 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 oil holes communicating with the flow channel are opened on the wall surface of the first hydraulic cavity; the driving unit is a driving motor, and 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, and 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, and the outer ring of the bearing rotates with the hollow shaft and the hollow pump shaft, and 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 is connected to the second hydraulic chamber 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 full-active vibration reduction system according to claim 1 is 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 full-active vibration reduction system according to claim 3 is characterized in that: An accumulator is connected in parallel to the oil path connecting the restoring solenoid valve and the compression solenoid valve.

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

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

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

8. The hollow full-active vibration reduction system according to claim 3 is characterized in that: It also includes a first safety valve, wherein an oil inlet of the first safety valve is communicated with the first oil circuit, and an oil outlet of the first safety valve is communicated with the second oil circuit.

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

10. The hollow full-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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