Double-cylinder hydraulic active shock absorber

Abstract

The invention relates to the technical field of shock absorption, in particular to a double-cylinder hydraulic active shock absorber which comprises an outer cylinder body, an inner cylinder body, a piston unit, a bottom exchange unit and an end cover unit. An outer cavity is formed between the inner cylinder body and the outer cylinder body. The piston unit is movably arranged in the hollow cavity of the inner cylinder and divides the hollow cavity into an upper inner cavity and a lower inner cavity. The bottom exchange unit is connected with one end of the inner cylinder. The outer peripheral wall of the bottom exchange unit and the inner peripheral wall of the outer barrel are arranged at intervals to form a first channel. The open end of the end cover unit is connected with one end of the inner cavity. The circumferential sides of the end cover unit and the bottom exchange unit are arranged at intervals to form a second channel. The end cover unit and the round end side of the bottom exchange unit are arranged at intervals to form a third channel. And the lower inner cavity, the bottom exchange unit, the third channel, the second channel, the first channel and the outer cavity are sequentially communicated to form an oil discharge channel. The minimum value of the cross section of the oil discharge channel is located in the first channel part. In this way, the problem that part of oil ducts of a double-cylinder hydraulic active shock absorber are narrow and small, and consequently oil ways are not smooth is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shock absorption technology, in particular to a double-cylinder hydraulic active shock absorber. BACKGROUND

[0002] As a core component for improving the comfort and handling of vehicles, the double-cylinder hydraulic active shock absorber is widely used in the fields of high-end passenger cars and engineering machinery due to its strong load-bearing capacity and wide damping adjustment range. In the double-cylinder hydraulic active shock absorber, the annular space between the outer cylinder and the inner cylinder, and the gap between the bottom unit and the cylinder jointly form the key channel for oil circulation. The flow capacity of the oil discharge channel directly determines the response speed, energy loss and long-term reliability of the shock absorber. The first channel formed by the outer peripheral wall of the bottom unit and the inner peripheral wall of the outer cylinder is a key link in the oil discharge path that connects the bottom unit and the outer cavity, and the cross-sectional size of the first channel plays a decisive role in the flow resistance of the oil.

[0003] When the open end of the end cover unit of the existing double-cylinder hydraulic active shock absorber is connected between the outer cylinder and the inner cylinder, the gap space between the end cover and the inner cylinder is limited, resulting in a relatively narrow channel for oil flow. This narrow channel greatly limits the flow efficiency of the oil, making it difficult for the oil to flow quickly and smoothly between the cavities during the operation of the shock absorber, thereby affecting the response speed and buffering effect of the shock absorber on vibrations. In order to increase the gap between the end cover and the inner cylinder, it is often necessary to increase the volume of the shock absorber, making it difficult to adapt to some application scenarios that have strict requirements on space size, such as the chassis space of some high-end cars and the limited installation position inside precision instruments. SUMMARY

[0004] To solve the problem of narrow oil passage in the double-cylinder hydraulic active shock absorber, the present application provides a double-cylinder hydraulic active shock absorber, comprising:

[0005] an outer cylinder;

[0006] an inner cylinder, which is arranged in the hollow cavity of the outer cylinder, and forms an outer cavity with the outer cylinder;

[0007] a piston unit, part of which is movably arranged in the hollow cavity of the inner cylinder, dividing it into an upper inner cavity and a lower inner cavity;

[0008] a bottom unit, which is connected to the end of the inner cylinder away from the upper inner cavity; the outer peripheral wall of the bottom unit and the inner peripheral wall of the outer cylinder are spaced apart to form a first channel;

[0009] An end cover unit is provided as a half spherical shell; an open end of the end cover unit is connected to an end of the outer cylinder body away from the upper inner cavity; the end cover unit and the bottom unit are arranged apart from each other in a circumferential direction to form a second passage; the end cover unit and the bottom unit are arranged apart from each other in a circumferential direction to form a third passage;

[0010] The lower inner cavity, the bottom unit, the third passage, the second passage, the first passage, and the outer cavity are sequentially connected to form an oil discharge passage; a minimum value of a cross-sectional area of the oil discharge passage is located in the first passage.

[0011] In some embodiments, a maximum value of a cross-sectional area of the oil discharge passage is located in the second passage.

[0012] In some embodiments, the bottom unit comprises a first one-way valve and a second one-way valve; the first one-way valve is configured to allow fluid to flow from the lower inner cavity to the third passage in one direction; the second one-way valve is configured to allow fluid to flow from the third passage to the lower inner cavity in one direction.

[0013] A cross-sectional area of a liquid flow passage of the first one-way valve is smaller than a cross-sectional area of a liquid flow passage of the second passage.

[0014] In some embodiments, a cross-sectional area of the outer cavity is smaller than a cross-sectional area of the liquid flow passage of the first one-way valve.

[0015] In some embodiments, an inner circumferential wall of the open end of the end cover unit is connected to an outer circumferential wall of the outer cylinder body.

[0016] In some embodiments, the bottom unit comprises a first valve column, a second valve column, and a flow passage; an end of the first valve column and the second valve column away from the end cover unit is connected; an outer diameter of the second valve column is larger than an outer diameter of the first valve column; the flow passage penetrates through an outer circumferential edge of the second valve column away from the first valve column; the third passage is at least partially composed of the flow passage; an outer circumferential wall of the first valve column is in abutment with an inner circumferential wall of the inner cylinder body; an end of the second valve column away from the upper inner cavity is connected to the inner cylinder body.

[0017] In some embodiments, the double-cylinder hydraulic active shock absorber comprises a shock absorbing assembly; the shock absorbing assembly comprises an outer cylinder unit and an inner cylinder unit; the outer cylinder unit comprises a boss portion and an outer cylinder body; the boss portion is arranged around an inner wall of the outer cylinder body;

[0018] The inner cylinder unit comprises a mounting groove, a sealing ring, and an inner cylinder body; the mounting groove is arranged around an outer circumferential wall of the inner cylinder body; the sealing ring is in abutment with a bottom wall of the mounting groove and the boss portion, respectively, to divide the outer cavity into an upper outer cavity and a lower outer cavity; the upper outer cavity is in communication with the upper inner cavity; the lower outer cavity is in communication with the first passage.

[0019] In some embodiments, the outer cylinder unit further comprises a first port, a second port, and a third port; the second port is in communication with the lower outer cavity; the first port and the third port are in communication with the upper outer cavity;

[0020] The double-cylinder hydraulic active shock absorber further comprises a driving assembly and an energy storage assembly.

[0021] The inlet and outlet of the driving assembly are in communication with the first port and the second port, respectively; the energy storage assembly is in communication with the third port.

[0022] In some embodiments, the driving assembly comprises a driving unit and a first support unit; the first support unit is connected with the outer cylinder body and the driving unit, respectively; the driving unit comprises a motor and a hydraulic pump; the hydraulic pump is drivingly connected with the motor, and the inlet and outlet of the hydraulic pump are in communication with the first port and the second port, respectively.

[0023] In some embodiments, the energy storage assembly comprises an energy storage unit and a second support unit; the inner cavity of the energy storage unit is in communication with the upper outer cavity; the energy storage unit is connected with the outer peripheral wall of the outer cylinder body through the second support unit; the energy storage unit and the driving unit are located on opposite sides of the outer cylinder body, respectively.

[0024] To solve the problem of narrow oil passage of the double-cylinder hydraulic active shock absorber, the present application has the following advantages:

[0025] By changing the connection position of the end cover to the end of the outer cylinder body away from the upper inner cavity, the end cover is no longer constrained by the internal structure of the outer cylinder body, and can form a second channel and a third channel with the circumferential side and the circular end side of the bottom unit, respectively. At the same time, the first channel formed by the bottom unit and the inner peripheral wall of the outer cylinder body does not need to be compressed in the limited space with the end cover. Compared with the position of connecting the end cover between the outer cylinder body and the inner cylinder body, the cross-sectional area of the first channel formed is larger, and the overall oil flow path changes from a single narrow channel to multiple coordinated channels, the effective flow area is significantly expanded, which can ensure the smoothness and rapid response of the oil in the channel. The oil can flow more quickly from the lower inner cavity to the outer cavity through the bottom unit, the third channel, the second channel, and the first channel; or quickly flow into the lower inner cavity through the first channel, the second channel, the third channel, and the bottom unit, thereby reducing the response delay of the shock absorber to vibration. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Structure diagram of a double-cylinder hydraulic active shock absorber of an embodiment;

[0027] Figure 2 Structure diagram of a bottom unit of the double-cylinder hydraulic active shock absorber of an embodiment; Figure 1 Structure diagram of an energy storage assembly of the double-cylinder hydraulic active shock absorber of an embodiment;

[0028] Figure 3 Fig. 1 is a perspective view of a hydraulic shock absorber according to an embodiment of the present disclosure; Figure 1 Fig. 2 is a sectional view of a double-cylinder hydraulic active shock absorber according to an embodiment of the present disclosure;

[0029] Figure 4 Fig. 3 is a sectional view of a double-cylinder hydraulic active shock absorber according to an embodiment of the present disclosure; Figure 3 Fig. 4 is an enlarged view of portion A in Fig. 3;

[0030] Figure 5 Fig. 5 is an enlarged view of portion B in Fig. 3; Figure 3 Fig. 6 is an enlarged view of portion C in Fig. 3;

[0031] Figure 6 Fig. 7 is a structural schematic view of a driving assembly in the double-cylinder hydraulic active shock absorber according to an embodiment of the present disclosure. Figure 1

[0032] Reference Signs:

[0033] 10, shock absorbing assembly; 11, outer cylinder unit; 111, outer cylinder body; 112, boss portion; 113, first port; 114, second port; 115, third port; 12, inner cylinder unit; 121, inner cylinder body; 122, mounting groove; 123, sealing ring; 13, piston unit; 131, piston rod; 132, piston body; 14, bottom exchange unit; 141, bottom exchange module; 1411, first valve stem; 1412, second valve stem; 1413, flow-through groove; 142, first one-way valve; 143, second one-way valve; 15, end cap unit; 151, connecting ring; 152, sealing arc portion; 20, driving assembly; 21, driving unit; 211, motor; 212, hydraulic pump; 22, first support unit; 30, energy storage assembly; 31, energy storage unit; 32, second support unit. DETAILED DESCRIPTION

[0034] The present disclosure will now be discussed with reference to several example embodiments. It should be appreciated that these embodiments are discussed only to better illustrate the present disclosure and thus enable its best utilization, and are not intended to limit the scope of the present disclosure in any way.

[0035] ​As used herein, the term "includes" and its variants are to be read as open-ended terms that mean "including, but not limited to." The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be understood to mean "at least one embodiment." The term "another embodiment" is to be understood to mean "at least one other embodiment." The terms "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and the like are used for description only and do not indicate or imply attachment or construction in a particular orientation. These terms are used merely to better describe the application and its embodiments and are not used to limit the scope of the indicated device, element or component. Also, these terms can have meanings other than those directly associated with the terms themselves to those skilled in the art, which meanings are clear to those skilled in the art based on the context in which the terms are used. Further, the terms "mount," "set," "have," "connected," "coupled," "affixed," and the like are used to mean either a direct connection or an indirect connection, such as through an intermediate medium, and are not limited to a direct connection. These terms are merely used to better describe the application and its embodiments and are not used to limit the scope of the indicated device, element or component. Further, the terms "first," "second," and the like are used merely to better describe the application and its embodiments and are not used to limit the scope of the indicated device, element or component. Unless otherwise stated, the term "plurality" means two or more.

[0036] Embodiment One:

[0037] The present embodiment proposes a double-cylinder hydraulic active damper, as shown in Figure 1 、 Figure 3 、 Figure 4 The double-cylinder hydraulic active damper includes an outer cylinder 111, an inner cylinder 121, a piston unit 13, a bottom single unit 14, and an end cover unit 15. The inner cylinder 121 is arranged in the hollow cavity of the outer cylinder 111. An outer cavity is formed between the inner cylinder 121 and the outer cylinder 111. An outer layer path is provided for oil storage and flow.

[0038] Part of the piston unit 13 is movably arranged in the hollow cavity of the inner cylinder 121, which divides it into an upper inner cavity and a lower inner cavity. Both the upper inner cavity and the lower inner cavity are filled with hydraulic oil. When the carrier is subjected to vibration, the piston unit 13 reciprocates up and down along the inner wall of the inner cylinder 121. The smooth inner wall of the inner cylinder 121 can prevent the piston from deviating and ensure that the piston always presses the oil vertically.

[0039] The bottom unit 14 is connected to the end of the inner cylinder 121 away from the upper inner cavity. The outer peripheral wall of the bottom unit 14 is arranged in a spaced manner with the inner peripheral wall of the outer cylinder 111 to form a first passage.

[0040] The end cover unit 15 is arranged as a semi-spherical shell. The open end of the end cover unit 15 is connected to the end of the outer cylinder 111 away from the upper inner cavity. The end cover unit 15 is arranged in a spaced manner with the circumferential side of the bottom unit 14 to form a second passage, and is arranged in a spaced manner with the circular end side of the bottom unit 14 to form a third passage. In this way, the end cover is no longer constrained by the internal structure of the outer cylinder 111, and can form the second passage and the third passage with the circumferential side and the circular end side of the bottom unit 14, respectively. At the same time, the first passage formed by the bottom unit 14 and the inner peripheral wall of the outer cylinder 111 also does not need to be compressed in the limited space of the end cover.

[0041] The lower inner cavity, the bottom unit 14, the third passage, the second passage, the first passage, and the outer cavity are sequentially connected to form an oil discharge passage. The minimum value of the cross-sectional area of the oil discharge passage is located in the first passage. In this way, the narrowest part of the overall oil flow path is increased. Compared with the position of connecting the end cover between the outer cylinder 111 and the inner cylinder 121, the cross-sectional area of the first passage formed is larger, and the overall oil flow path changes from a single narrow channel to a multi-section coordinated channel, the effective flow area is significantly expanded, which can ensure the smooth flow and rapid response of the oil in the passage. The oil can flow more quickly from the lower inner cavity to the outer cavity through the bottom unit 14, the third passage, the second passage, and the first passage; or quickly flow from the lower inner cavity to the outer cavity through the first passage, the second passage, the third passage, and the bottom unit 14, thereby reducing the response delay of the shock absorber to vibration.

[0042] Further, the maximum value of the cross-sectional area of the oil discharge passage is located in the second passage. In this way, the liquid flow channel of the second passage is wider, and the second passage can sufficiently temporarily store high-pressure oil, providing a more stable oil flow basis for subsequent precise damping adjustment of the first passage, and avoiding the situation that the carrier cannot be supplied with oil in time when it is subjected to a large vibration. At the same time, when the shock absorber is compressed, the second passage can temporarily store more high-pressure oil, avoiding that the narrower first passage bears too high oil pressure. In this way, without additional increase in the volume of the shock absorber, the pressure buffering and oil flow stabilization effects are strengthened, and the damping adjustment precision and shock absorption smoothness are further improved.

[0043] Further, the bottom unit 14 comprises a first one-way valve 142 and a second one-way valve 143. The first one-way valve 142 is configured to allow fluid to flow from the lower inner cavity to the third channel in one direction; the second one-way valve 143 is configured to allow fluid to flow from the third channel to the lower inner cavity in one direction. The cross-sectional area of the liquid flow passage of the first one-way valve 142 is smaller than that of the second passage. In the compression working condition of the piston moving downward, the oil in the lower inner cavity needs to flow to the third channel through the first one-way valve 142 with a smaller cross-sectional area. The small cross-section passage can form a moderate throttling damping, accurately control the oil flow rate, avoid the damping force being too soft due to the oil being discharged too fast during the compression process, and cooperate with the second passage to further stabilize the pressure fluctuation of the lower inner cavity. In the recovery working condition of the piston moving upward, the lower inner cavity forms a negative pressure, and the oil in the third channel can quickly return through the second one-way valve 143 to supplement, effectively avoiding the vacuum in the lower inner cavity due to the oil not being supplied in time, thereby preventing the erosion of the components by the cavitation phenomenon, and ensuring the smooth recovery process without jamming, thereby improving the buffering comfort and long-term reliability of the shock absorber.

[0044] Further, the cross-sectional area of the outer cavity is smaller than that of the liquid flow passage of the first one-way valve 142. In this way, the first one-way valve 142 already has a larger flow passage cross-sectional area, which can ensure efficient flow of oil from the lower inner cavity to the third channel in the compression working condition, so there is no need to expand the oil passage of the outer cavity to compensate for the flow, avoiding the increase in volume due to the expansion of the oil passage. Thus, without affecting the efficiency of oil flow, the radial space of the compression outer cavity can be reduced to reduce the overall volume of the shock absorber, making it more suitable for compact installation scenarios.

[0045] Further, the inner peripheral wall of the open end of the end cover unit 15 is connected with the outer peripheral wall of the outer cylinder body 111. In this way, the end cover unit 15 is connected with the outer peripheral wall of the outer cylinder body 111 by the inner peripheral wall, and the assembly position of the end cover only acts on the outer peripheral region of the outer cylinder, without extending into the inner part of the outer cylinder body 111 or the annular oil passage between the inner cylinder body 121 and the outer cylinder body 111. In this way, the end cover unit 15 indirectly widens the oil discharge passage, without the need to expand the oil passage by increasing the volume of the shock absorber. Moreover, in this way, the installation of the end cover unit 15 is facilitated during assembly.

[0046] In some embodiments, the end cover unit 15 comprises a connecting ring 151 and a sealing arc part 152, the sealing arc part 152 being sealed at one end of the connecting ring 151, and the connecting ring 151 and the sealing arc part 152 combined together in a hemispherical shell shape. The inner peripheral wall of the connecting ring 151 is welded and fixed with the outer peripheral wall of the outer cylinder body 111. In this way, the connecting ring 151 only acts on the outside of the outer cylinder body 111, completely avoiding the oil passage, and completely eliminating the obstruction of the oil passage by the end cover. The welding and fixing has high strength and can resist the vibration and impact during the operation of the shock absorber, improving the overall structural stability. At the same time, the sealing arc part 152 can effectively block the leakage of oil from the end, and balance the oil passage smoothness and sealing reliability.

[0047] Further, the bottom unit 14 comprises a bottom replacement module 141. The bottom replacement module 141 comprises a first valve column 1411, a second valve column 1412, and a flow-through groove 1413. The first valve column 1411 is connected to the end of the second valve column 1412 away from the end cover unit 15. The outer diameter of the second valve column 1412 is larger than that of the first valve column 1411. The flow-through groove 1413 penetrates the outer periphery of the second valve column 1412 away from the first valve column 1411. The third channel is at least partially composed of the flow-through groove 1413. The outer peripheral wall of the first valve column 1411 abuts against the inner peripheral wall of the inner cylinder body 121. The second valve column 1412 is connected to the end of the inner cylinder body 121 away from the upper inner cavity. The second valve column 1412 has a larger outer diameter and can directly form a radial limiting and sealing fit with the end of the inner cylinder body 121 away from the upper inner cavity. The first valve column 1411 has a small outer diameter and abuts against the inner wall of the inner cylinder, and the two form double positioning from top to bottom. Without additional complex fixing structure, the bottom unit 14 can be quickly and stably assembled at the bottom of the inner cylinder, and the shaking and deviation during work can be avoided.

[0048] The flow-through groove 1413 is arranged on the outer periphery of the second valve column 1412 and constitutes the third channel. The second valve column 1412 is connected to the end of the inner cylinder, and the first valve column 1411 abuts against the inner wall of the inner cylinder, both of which avoid the flow-through groove 1413 area, so that the oil can smoothly enter and exit the third channel along the flow-through groove 1413, and the oil passage is not hindered by the fixed structure.

[0049] Further, as shown in FIG. 1, the bottom unit 14 comprises a bottom replacement module 141. The bottom replacement module 141 comprises a first valve column 1411, a second valve column 1412, and a flow-through groove 1413. The first valve column 1411 is connected to the end of the second valve column 1412 away from the end cover unit 15. The outer diameter of the second valve column 1412 is larger than that of the first valve column 1411. The flow-through groove 1413 penetrates the outer periphery of the second valve column 1412 away from the first valve column 1411. The third channel is at least partially composed of the flow-through groove 1413. The outer peripheral wall of the first valve column 1411 abuts against the inner peripheral wall of the inner cylinder body 121. The second valve column 1412 is connected to the end of the inner cylinder body 121 away from the upper inner cavity. The second valve column 1412 has a larger outer diameter and can directly form a radial limiting and sealing fit with the end of the inner cylinder body 121 away from the upper inner cavity. The first valve column 1411 has a small outer diameter and abuts against the inner wall of the inner cylinder, and the two form double positioning from top to bottom. Without additional complex fixing structure, the bottom unit 14 can be quickly and stably assembled at the bottom of the inner cylinder, and the shaking and deviation during work can be avoided. Figure 5As shown, the double-tube hydraulic active shock absorber includes a shock absorbing assembly 10. The shock absorbing assembly 10 includes an outer tube unit 11 and an inner tube unit 12. The outer tube unit 11 includes a boss portion 112 and an outer tube body 111. The boss portion 112 is arranged around the inner wall of the outer tube body 111. The inner tube unit 12 includes a mounting groove 122, a sealing ring 123, and an inner tube body 121. The mounting groove 122 is arranged around the outer peripheral wall of the inner tube body 121. The sealing ring 123 abuts against the bottom wall of the mounting groove 122 and the boss portion 112, respectively, to divide the outer chamber into an upper outer chamber and a lower outer chamber. The upper outer chamber is connected to the upper inner chamber. The lower outer chamber is connected to the first channel. The boss 112 forms a precise abutment with the sealing ring 123 within the mounting groove 122. The radial compressive force exerted by the boss 112 on the sealing ring 123 reliably isolates the upper and lower outer chambers, preventing fluid crossflow between the two chambers. This ensures that the drive unit 21 precisely and effectively regulates the flow rates of the upper and lower chambers through the first and second ports 113 and 114, fundamentally guaranteeing the accuracy of damping force regulation. This also limits axial movement of the inner cylinder within the outer cylinder 111. Combined with the elastic contact of the sealing ring 123, it compensates for minor dimensional deviations between the outer and inner cylinders during processing or assembly, ensuring both sealing reliability and avoiding structural wear caused by rigid contact. Furthermore, the sealing ring 123 is constrained within the mounting groove 122 and stably abuts against the boss 112, preventing displacement or flipping of the sealing ring 123 during high-pressure fluid impact or relative movement of the inner cylinder. This extends the service life of the sealing ring 123 and reduces the degradation of shock absorption performance due to seal failure.

[0050] Furthermore, if Figure 2 The outer cylinder unit 11 shown also includes a first port 113, a second port 114, and a third port 115. The second port 114 communicates with the lower outer chamber. The first port 113 and the third port 115 communicate with the upper outer chamber. The twin-cylinder hydraulic active shock absorber also includes a drive assembly 20 and an energy storage assembly 30. The inlet and outlet of the drive assembly 20 communicate with the first port 113 and the second port 114, respectively. The energy storage assembly 30 communicates with the third port 115.

[0051] When the shock absorber needs to increase damping, the drive assembly 20 pumps oil into the lower outer chamber through the first port 113 to increase pressure, or restricts oil outflow through the second port 114, thereby changing the movement resistance of the inner cylinder unit 12. When damping needs to be reduced, the drive assembly 20 reverses the oil flow.

[0052] When the shock absorber is in compression working condition, the piston moves downward, the volume of the upper inner cavity increases and the volume of the lower inner cavity decreases, and the oil in the lower inner cavity flows into the upper inner cavity through the oil discharge channel. The upper outer cavity needs to be replenished with oil due to the increase in volume. The energy storage component 30 can release oil through the third port 115 to replenish the upper inner cavity, avoiding oil circuit cavities caused by too low pressure.

[0053] When the shock absorber recovers to normal working condition, the piston moves upward, the volume of the upper inner cavity decreases, and the energy storage assembly 30 can absorb the excess oil and pressure in the upper outer cavity through the third port 115 to prevent the pressure from rising suddenly and damaging the seal or affecting the damping adjustment accuracy.

[0054] The inner cavity oil is extruded into the lower outer cavity, and the upper outer cavity may have a pressure rise due to the displacement of the piston unit 13. The energy storage assembly 30 can absorb the excess oil and pressure in the upper outer cavity through the third port 115 to prevent the pressure from rising suddenly and damaging the seal or affecting the damping adjustment accuracy.

[0055] Further, as shown in Figure 6 The driving assembly 20 includes a driving unit 21 and a first support unit 22. The first support unit 22 is connected with the outer cylinder 111 and the driving unit 21 respectively. The driving unit 21 includes a motor 211 and a hydraulic pump 212. The hydraulic pump 212 is drivingly connected with the motor 211, and the inlet and outlet ports of the hydraulic pump 212 are communicated with the first port 113 and the second port 114 respectively.

[0056] The driving unit 21 can actively adjust the flow, pressure or flow direction of the fluid according to the vibration signal fed back by the sensor, so as to increase the damping by increasing the flow resistance of the fluid to suppress violent vibration, or to reduce the resistance to enhance the buffering effect, thereby realizing real-time active damping performance adjustment.

[0057] The driving of the motor 211 can adjust the inlet and outlet oil volume of the hydraulic pump 212 in real time, the pressure difference in the chamber is changed by changing the flow, and then the damping force of the piston movement is dynamically adjusted, realizing continuous stepless adjustment of the damping force from minimum to maximum, instead of the fixed damping or stepped damping of the passive shock absorber, which can accurately match the damping needs in different dynamic conditions such as vehicle acceleration, braking, turning and bumping.

[0058] Further, the energy storage assembly 30 includes an energy storage unit 31 and a second support unit 32. The inner cavity of the energy storage unit 31 is communicated with the upper outer cavity. The energy storage unit 31 is connected with the outer peripheral wall of the outer cylinder 111 through the second support unit 32. The energy storage unit 31 and the driving unit 21 are located on opposite sides of the outer cylinder 111 respectively.

[0059] When the piston moves upward, the volume of the upper inner cavity decreases, and the volume of the upper outer cavity changes correspondingly. The energy storage unit 31 can absorb the excess fluid by its own elastic contraction. When the piston moves downward, the volume of the upper inner cavity increases, and the energy storage unit 31 releases the fluid to supplement, avoiding the violent fluctuation of the chamber pressure due to the sudden change of the volume, providing a stable fluid environment for the driving unit 21 to accurately adjust the damping force, and ensuring the smoothness of the shock absorbing response. The driving unit 21 and the energy storage unit 31 are located on opposite sides of the outer cylinder 111, which can make the overall gravity center of the shock absorber as close as possible to the axis of the outer cylinder 111, avoiding the gravity center deviating to one side. This balanced design can greatly reduce the eccentric moment of the shock absorber during operation.

[0060] In some embodiments, the piston unit 13 includes a piston rod 131 and a piston body 132. The piston body 132 is disposed in the hollow cavity of the inner cylinder 121, which is divided into an upper inner cavity and a lower inner cavity. The piston rod 131 is movably connected to the piston body 132. Under the pressure regulation action of the drive unit 21, the piston body 132 drives the piston rod 131 to partially extend outside the outer cylinder 111, or partially retract into the inner cylinder 121. When the active shock absorber is installed in a vehicle, the piston body 132 can increase the support stiffness or increase the buffer stroke through movement, thereby improving driving and riding comfort.

[0061] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A double-tube hydraulic active shock absorber, characterized in that: The double-tube hydraulic active shock absorber comprises: outer cylinder; An inner cylinder, the inner cylinder being disposed in the hollow cavity of the outer cylinder; an outer cavity being formed between the inner cylinder and the outer cylinder; A piston unit, part of which is movably disposed in the hollow cavity of the inner cylinder, dividing the inner cylinder into an upper cavity and a lower cavity; a bottom exchange unit connected to an end of the inner cylinder away from the upper inner cavity; an outer peripheral wall of the bottom exchange unit and an inner peripheral wall of the outer cylinder are spaced apart to form a first channel; An end cap unit, the end cap unit being configured as a hemispherical shell; the open end of the end cap unit being connected to an end of the outer cylinder away from the upper inner cavity; the end cap unit being spaced apart from the circumferential side of the bottom exchange unit to form a second channel; and the end cap unit being spaced apart from the circumferential end side of the bottom exchange unit to form a third channel; The lower inner cavity, the bottom exchange unit, the third channel, the second channel, the first channel, and the outer cavity are sequentially connected to form an oil drainage channel; the minimum cross-section of the oil drainage channel is located in the first channel portion.

2. A double-tube hydraulic active shock absorber according to claim 1, characterized in that: The maximum cross-section of the oil discharge channel is located in the second channel portion.

3. The double-tube hydraulic active shock absorber according to claim 1, characterized in that: The bottom exchange unit includes a first one-way valve and a second one-way valve; the first one-way valve is configured to allow fluid to flow from the lower inner cavity to the third channel in one direction; the second one-way valve is configured to allow fluid to flow from the third channel to the lower inner cavity in one direction; A cross-sectional area of ​​the liquid circulation passage of the first one-way valve is smaller than a cross-sectional area of ​​the liquid circulation passage of the second passage.

4. A double-tube hydraulic active shock absorber according to claim 3, characterized in that: The cross-sectional area of ​​the outer cavity is smaller than the cross-sectional area of ​​the liquid flow channel of the first one-way valve.

5. The double-tube hydraulic active shock absorber according to claim 1, characterized in that: The inner peripheral wall of the open end of the end cover unit is connected to the outer peripheral wall of the outer cylinder.

6. The double-tube hydraulic active shock absorber according to claim 1, characterized in that: The bottom replacement unit includes a first valve column, a second valve column, and a circulation groove; the first valve column is connected to the end of the second valve column away from the end cover unit; the outer diameter of the second valve column is larger than the outer diameter of the first valve column; the circulation groove passes through the outer periphery of the second valve column away from the first valve column; the third channel is at least partially composed of the circulation groove; the outer peripheral wall of the first valve column abuts the inner peripheral wall of the inner cylinder; the second valve column is connected to the end of the inner cylinder away from the upper inner cavity.

7. A double-tube hydraulic active shock absorber according to claim 6, characterized in that: The double-tube hydraulic active shock absorber includes a shock absorbing assembly; the shock absorbing assembly includes an outer tube unit and an inner tube unit; the outer tube unit includes a boss portion and the outer tube body; the boss portion is arranged around the inner wall of the outer tube body; The inner cylinder unit includes a mounting groove, a sealing ring, and the inner cylinder body; the mounting groove is arranged on the outer peripheral wall of the inner cylinder body; the sealing ring abuts against the bottom wall and the boss portion of the mounting groove respectively to divide the outer cavity into an upper outer cavity and a lower outer cavity; the upper outer cavity is connected to the upper inner cavity; and the lower outer cavity is connected to the first channel.

8. The double-tube hydraulic active shock absorber according to claim 7, characterized in that: The outer cylinder unit further comprises a first port, a second port, and a third port; the second port is connected to the lower outer cavity; the first port and the third port are connected to the upper outer cavity; The double-tube hydraulic active shock absorber also includes a drive component and an energy storage component; The inlet and outlet of the driving component are respectively connected to the first port and the second port; the energy storage component is connected to the third port.

9. The double-tube hydraulic active shock absorber according to claim 8, characterized in that: The drive assembly includes a drive unit and a first support unit; the first support unit is respectively connected to the outer cylinder and the drive unit; the drive unit includes a motor and a hydraulic pump; the hydraulic pump is drive-connected to the motor, and the oil inlet and outlet of the hydraulic pump are respectively connected to the first port and the second port.

10. The double-tube hydraulic active shock absorber according to claim 9, characterized in that: The energy storage assembly includes an energy storage unit and a second support unit; the inner cavity of the energy storage unit is connected to the upper outer cavity; the energy storage unit is connected to the outer peripheral wall of the outer cylinder through the second support unit; the energy storage unit and the driving unit are respectively located on opposite sides of the outer cylinder.

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