Hybrid suspension actuator

Abstract

The invention discloses a hybrid suspension actuator, and relates to the technical field of automobile suspension systems, the hybrid suspension actuator comprises a linear motor and a magnetorheological damper, the linear motor comprises a motor lower end cover, a stator assembly and a rotor assembly, the stator assembly is coaxially arranged at the edge of the top surface of the motor lower end cover, and the rotor assembly is coaxially arranged at the edge of the top surface of the motor lower end cover; a motor outer sleeve, an annular permanent magnet and a magnetic steel inner guide sleeve are sequentially arranged in the motor lower end cover from outside to inside, the rotor assembly is coaxially arranged in the center of the top face of the motor lower end cover and comprises a motor rotor coil and a liquid cooling iron core, and an S-shaped cooling channel is formed in the liquid cooling iron core around the center axis of the liquid cooling iron core. And two ports of the S-shaped cooling channel are positioned on the top surface of the liquid cooling iron core and are respectively connected with a liquid inlet guide pipe and a liquid outlet guide pipe. According to the invention, the main power of the linear motor is more controllable, and the temperature of the liquid cooling iron core is reduced by using the cooling liquid flowing in the S-shaped cooling channel, so that better temperature control of the linear motor is realized.

Description

Technical Field

[0001] This invention relates to the field of automotive suspension system technology, specifically a hybrid suspension actuator. Background Technology

[0002] The car suspension is used to transmit the forces and torques between the wheels and the chassis, while reducing the impact force transmitted to the vehicle from uneven road surfaces, reducing the vibration caused by it, and improving longitudinal grip, thereby ensuring the comfort of the vehicle and the stability of the vehicle's handling, making the vehicle ride smoother.

[0003] With the continuous advancement of the automotive industry and people's increasing demands for vehicle comfort and safety, semi-active and active suspension systems are gradually being widely used. Semi-active suspension, by introducing real-time adjustable damping technology, can adjust the suspension damping coefficient in real time according to road conditions and driving conditions, thus achieving a significant performance improvement. Although semi-active suspension can adjust the damping magnitude according to road conditions, it can only generate forces that resist motion, and its vibration reduction effect is not as good as active suspension. Active suspension, through an independent motor, can output a counterforce in real time, theoretically completely offsetting the impact from the road surface, providing a more comfortable driving experience and handling stability. Furthermore, its damping adjustment range and control effect are superior to semi-active suspension. However, although active suspension has outstanding vibration reduction effects, because its damping force is all output by the motor, this leads to higher energy consumption and higher motor temperature, which can damage the coils. Therefore, active suspension is still in the development stage.

[0004] To address this, a hybrid suspension actuator is proposed to provide more reasonable and reliable dynamic performance as well as better temperature control. Summary of the Invention

[0005] The purpose of this invention is to provide a hybrid suspension actuator to solve the problems of poor temperature control and unstable power control of the linear motor in existing suspension actuators mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hybrid suspension actuator, comprising a linear motor and a magnetorheological damper, wherein the linear motor comprises a lower end cover, a stator assembly, and a mover assembly, the stator assembly being coaxially disposed at the top edge of the lower end cover, and having an outer sleeve, an annular permanent magnet, and an inner guide sleeve for the magnet arranged sequentially from the outside to the inside; the mover assembly being coaxially disposed at the center of the top surface of the lower end cover, and having a tower top, an upper coil end cover, a liquid circuit end cover, an upper guide ring for the mover, a magnetic shielding plate, a mover coil, a liquid-cooled iron core, and a lower guide ring for the mover arranged sequentially from top to bottom; The liquid-cooled iron core has an S-shaped cooling channel inside around its central axis. The two ends of the S-shaped cooling channel are located on the top surface of the liquid-cooled iron core and are respectively connected to an inlet pipe and an outlet pipe.

[0007] Preferably, the top surface of the liquid-cooled iron core has several holes and slots extending to the bottom surface of the liquid-cooled iron core around its central axis. The holes and slots include a first upper port, a second upper port, and a last upper port on the top surface of the liquid-cooled iron core. The holes and slots also include a first lower port, a second lower port, and a last lower port on the bottom surface of the liquid-cooled iron core. The first upper port is connected to the liquid inlet conduit, and the last upper port is connected to the liquid outlet conduit. The liquid inlet conduit and the liquid outlet conduit pass upward through the upper end cover of the coil and the top of the tower. After entering the first upper port through the liquid inlet conduit, the coolant flows downward from the first lower port and flows to the second lower port through the connecting groove on the bottom surface of the liquid-cooled iron core. After entering the second lower port, the coolant flows upward from the second upper port and continues to flow in an S-shape on the side wall of the liquid-cooled iron core through the connecting groove on the top surface of the liquid-cooled iron core. Finally, the coolant enters the last lower port and flows upward through the last upper port and the liquid outlet conduit.

[0008] Preferably, the magnetorheological damper includes a damper outer cylinder, a damper upper end cap, an air chamber, a floating piston, an upper chamber, a piston assembly, a lower chamber, a buffer block, a guide, and a lower lifting lug. The piston assembly includes a stop ring, a magnetic plate, a piston core, a piston excitation coil, a coil frame, a piston lower guide band, a piston outer cylinder, a piston lower end cap, and a piston rod. The piston assembly is slidably connected to the inner wall of the damper outer cylinder. An annular flow channel connecting the upper and lower chambers is provided on the piston assembly. The piston rod is slidably connected to the guide. The piston excitation coil is used to generate a magnetic field. By applying different current magnitudes, the magnetic field strength at the annular flow channel is changed, thereby changing the viscosity of the magnetorheological fluid and ultimately changing the damping coefficient of the magnetorheological damper. A floating piston guide band and a floating piston airtight ring are provided on the floating piston.

[0009] Preferably, the top of the inner guide sleeve of the magnet is provided with a fixed support, and an encoder is fixedly connected to the fixed support. An isolation sleeve is sleeved on the outer side of the damper outer cylinder above the liquid circuit end cap. A magnetic scale is provided on the outer side of the isolation sleeve. The encoder is suspended above the magnetic scale and is used to measure the displacement of the isolation sleeve. A magnetic shielding component is provided on the isolation sleeve. The magnetic shielding component is located outside the encoder and is used to reduce the influence of the annular permanent magnet. A through groove is opened on the magnetic shielding component for relative movement between the magnetic scale and the encoder.

[0010] Preferably, the stator assembly is fixedly connected to the piston rod, and the damper outer cylinder is fixedly connected to the mover assembly and guided by the upper guide ring of the motor mover, the lower guide ring of the motor mover, and the inner guide sleeve of the magnet.

[0011] Preferably, a buffer pad is provided on the inner top surface of the lower end cover of the motor, and a fastener is threadedly connected to the bottom of the liquid-cooled iron core. The fastener is located on the top of the buffer pad, and the bottom inner side of the liquid-cooled iron core is threadedly connected to the outer cylinder of the damper.

[0012] Preferably, the encoder includes an encoder harness at its top, a receiving groove is fitted onto the outer wall of the motor outer sleeve, a spring is provided between the receiving groove and the upper end cover of the coil, and an air passage is provided on the bottom surface of the buffer pad, the air passage extending out from the lower lifting lug.

[0013] Preferably, the upper end of the liquid-cooled iron core is provided with a liquid passage end cap, an O-ring is provided between the liquid-cooled iron core and the liquid passage end cap, and a rubber gasket and an O-ring are provided between the liquid-cooled iron core and the fastener to seal the flow of coolant in the liquid-cooled iron core.

[0014] Preferably, the tower top and the upper end cover of the coil are provided with wire holes for the lead-out of the motor mover coil harness.

[0015] Preferably, the upper and lower guide rings of the motor mover cooperate with the inner guide sleeve of the magnet for guidance, and the inner surfaces of the upper and lower guide rings of the motor mover are threaded and threadedly connected to the liquid-cooled iron core to fix the motor mover coil between the upper and lower guide rings of the motor mover.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This hybrid active suspension utilizes a ring-shaped permanent magnet located outside the motor's mover coil. This ensures that the ring-shaped permanent magnet and the motor's mover coil are in complete contact during operation, making the active force more controllable and easier to control. At the same time, the setting of magnetic scales and encoders makes the measurement of the relative movement between the stator and mover components more accurate, thus making the controllability of this hybrid active suspension stronger.

[0017] 2. This hybrid active suspension utilizes the flow of coolant in the S-shaped cooling channel to reduce the temperature of the liquid-cooled iron core. Since the liquid-cooled iron core is in contact with the motor mover coil, it can quickly remove the heat generated by the motor mover coil, thereby reducing the temperature fluctuation of the linear motor and ensuring that the motor mover coil does not fail due to excessive temperature, and can still maintain stable performance output during long-term operation.

[0018] 3. This hybrid active suspension uses a parallel configuration of a magnetorheological damper and a linear motor. In active drag mode, the magnetorheological damper can provide a larger damping force, resulting in lower energy consumption compared to drag generated entirely by the linear motor. In active thrust mode, the magnetorheological damper can adjust the damping coefficient to the minimum, thereby reducing drag in the opposite direction of vibration and further reducing energy consumption. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings. It is obvious that the drawings described below are merely some embodiments of the present invention, and other drawings can be obtained by those skilled in the art based on these drawings without any inventive effort. Wherein: Figure 1 This is an overall cross-sectional view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 for Figure 2 Sectional view of AA in the middle; Figure 4 for Figure 2 Cross-sectional view of the middle section (BB); Figure 5 This is a schematic diagram of the liquid-cooled iron core in this invention; Figure 6 for Figure 5 Sectional view of AA in the middle; Figure 7 for Figure 5 Cross-sectional view of the middle section (BB).

[0020] In the diagram: 1. Tower top; 2. Encoder harness; 3. Fixed support; 4. Encoder; 5. Magnetic scale; 6. Inner guide sleeve of magnet; 7. Floating piston airtight ring; 8. Annular permanent magnet; 9. Motor outer sleeve; 10. Liquid circuit end cover; 11. Upper guide ring of motor mover; 12. Magnetic shield; 13. Stop ring; 14. Motor mover coil; 15. Lower chamber; 16. Liquid-cooled iron core; 17. Rubber pad; 18. Guide; 19. Fastener; 20. Buffer pad; 21. Air passage groove; 22. Upper end cover of coil; 23. Motor mover coil harness; 24. Upper end cover of damper; 25. Air chamber; 26. Isolation sleeve; 27. Spring; 28. Floating piston guide 29. Floating piston; 30. Upper chamber; 31. O-ring; 32. Magnetic guide plate; 33. Piston core; 34. Piston excitation coil; 35. Coil frame; 36. Lower guide belt for piston; 37. Piston outer cylinder; 38. Lower end cap for piston; 39. Piston rod; 40. Buffer block; 41. Damper outer cylinder; 42. Lower guide ring for motor mover; 43. Lower end cap for motor; 44. Lower lifting lug; 45. Magnetic shielding component; 46. Inlet conduit; 461. First upper port; 462. First lower port; 463. Second lower port; 464. Second upper port; 47. Outlet conduit; 471. Last upper port; 472. Last lower port; 48. Connecting groove. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] Reference Figure 1-7As shown, the present invention provides a technical solution for a hybrid suspension actuator: A hybrid suspension actuator includes a linear motor and a magnetorheological damper. The linear motor includes a lower end cover 43, a stator assembly, and a mover assembly. The stator assembly is coaxially disposed at the top edge of the lower end cover 43, and from the outside to the inside are arranged an outer sleeve 9, an annular permanent magnet 8, and an inner guide sleeve 6 of a magnet. The mover assembly is coaxially disposed at the center of the top surface of the lower end cover 43, and from top to bottom are arranged a tower top 1, an upper coil end cover 22, a liquid circuit end cover 10, an upper guide ring 11 of the mover, a magnetic shielding plate 12, a mover coil 14, a liquid-cooled iron core 16, and a lower guide ring 42 of the mover.

[0025] The liquid-cooled iron core 16 has an S-shaped cooling channel inside its central axis. The two ends of the S-shaped cooling channel are located on the top surface of the liquid-cooled iron core 16 and are respectively connected to the liquid inlet pipe 46 and the liquid outlet pipe 47.

[0026] It should be noted that the S-shaped cooling channel in the liquid-cooled iron core 16 effectively extends the flow path of the coolant inside the liquid-cooled iron core 16, thereby increasing the heat exchange area and improving heat dissipation efficiency. After the coolant enters the S-shaped cooling channel through the inlet pipe 46, it flows along the preset S-shaped path, fully absorbing the heat on the liquid-cooled iron core 16, and finally flows out through the outlet pipe 47, forming a continuous cooling cycle. This not only optimizes the flow characteristics of the coolant, but also ensures that the motor mover coil 14 can maintain a suitable operating temperature under long-term high-load operation, thereby improving the reliability and stability of the entire suspension actuator. In addition, the S-shaped cooling channel has a simple structure, low manufacturing cost, and is easy to maintain and replace the coolant, further enhancing the practicality and economy of this hybrid suspension actuator.

[0027] Meanwhile, since the annular permanent magnet 8 in the linear motor of this hybrid active suspension is located outside the motor mover coil 14, the annular permanent magnet 8 is in complete contact with the motor mover coil 14 during the movement of this hybrid active suspension, making the active force more controllable and convenient to control the active force. At the same time, the setting of the magnetic scale 5 and the encoder 4 also makes the measurement of the relative movement between the stator assembly and the mover assembly more accurate, thus making the controllability of this hybrid active suspension stronger.

[0028] Reference Figure 1-7As shown, in an optional embodiment: the top surface of the liquid-cooled iron core 16 has a plurality of through holes extending to the bottom surface of the liquid-cooled iron core 16 around its central axis. The holes include a first upper port 461, a second upper port 464, and a last upper port 471 located on the top surface of the liquid-cooled iron core 16. The holes also include a first lower port 462, a second lower port 463, and a last lower port 472 located on the bottom surface of the liquid-cooled iron core 16. The first upper port 461 is connected to the liquid inlet conduit 46, and the last upper port 471 is connected to the liquid outlet conduit 47. The liquid inlet conduit 46 and the liquid outlet conduit 47... 7. The coolant flows upward through the upper end cover 22 of the coil and the top of the tower 1. After entering the first upper port 461 through the inlet pipe 46, it flows downward from the first lower port 462 and through the bottom surface connecting groove 48 of the liquid-cooled iron core 16 to the second lower port 463. After entering the second lower port 463, the coolant flows upward from the second upper port 464 and through the top surface connecting groove 48 of the liquid-cooled iron core 16 to continue flowing in an S-shape on the side wall of the liquid-cooled iron core 16. Finally, the coolant enters the last lower port 472 and flows upward through the last upper port 471 and the outlet pipe 47.

[0029] It should be noted that the arrangement of the slots and connecting grooves 48 cleverly utilizes the internal space of the liquid-cooled iron core 16 to construct a highly efficient S-shaped cooling channel. During the flow of the coolant, it can fully absorb heat from various parts of the liquid-cooled iron core 16, effectively preventing localized overheating and ensuring the stable operation of the motor mover coil 14. Furthermore, the processing technology for the slots and connecting grooves 48 is mature, resulting in low manufacturing costs, which is beneficial for large-scale production and application.

[0030] Reference Figure 1-7 As shown, in an optional embodiment: the magnetorheological damper includes a damper outer cylinder 41, a damper upper end cap 24, an air chamber 25, a floating piston 29, an upper chamber 30, a piston assembly, a lower chamber 15, a buffer block 40, a guide 18, and a lower lifting lug 44. The piston assembly includes a stop ring 13, a magnetic guide plate 32, a piston core 33, a piston excitation coil 34, a coil frame 35, a piston lower guide band 36, a piston outer cylinder 37, a piston lower end cap 38, and a piston rod 39. The component is slidably connected to the inner wall of the outer cylinder 41 of the damper. The piston assembly is provided with an annular flow channel connecting the upper chamber 30 and the lower chamber 15. The piston rod 39 is slidably connected to the guide 18. The piston excitation coil 34 is used to generate a magnetic field. By applying different current magnitudes, the magnetic field strength at the annular flow channel is changed, thereby changing the viscosity of the magnetorheological fluid and ultimately changing the damping coefficient of the magnetorheological damper. The floating piston 29 is provided with a floating piston guide band 28 and a floating piston airtight ring 7.

[0031] It should be noted that the magnetorheological damper generates a controllable magnetic field through the piston excitation coil 34, and utilizes the rheological properties of the magnetorheological fluid under the action of the magnetic field to achieve dynamic adjustment of the damping force. When the piston assembly reciprocates within the outer cylinder 41 of the damper, the upper chamber 30 and the lower chamber 15 are connected through an annular flow channel. When the magnetorheological fluid flows through the annular flow channel, it is subjected to the magnetic field to form controllable shear stress. By precisely controlling the current intensity of the piston excitation coil 34, the magnetic field intensity at the annular flow channel can be adjusted in real time, thereby changing the viscosity of the magnetorheological fluid. This allows the magnetorheological damper to provide a large damping force to meet the vibration suppression requirements, while also reducing energy loss in the active thrust mode by lowering the damping coefficient, thus achieving a balance between high efficiency and low energy consumption.

[0032] Reference Figure 1-7 As shown, in an optional embodiment: a fixed support 3 is provided on the top of the inner guide sleeve 6 of the magnet, and an encoder 4 is fixedly connected to the fixed support 3. An isolation sleeve 26 is sleeved on the outer side of the damper outer cylinder 41 above the liquid circuit end cover 10. A magnetic scale 5 is provided on the outer side of the isolation sleeve 26. The encoder 4 is suspended above the magnetic scale 5 and is used to measure the displacement of the isolation sleeve 26. A magnetic shielding component 45 is provided on the isolation sleeve 26. The magnetic shielding component 45 is located outside the encoder 4 and is used to reduce the influence of the annular permanent magnet 8. A through groove is opened on the magnetic shielding component 45 for relative movement between the magnetic scale 5 and the encoder 4.

[0033] It should be noted that the inner guide sleeve 6 and the fixed support 3 of the magnet ensure the stability of the encoder 4's installation position and avoid measurement errors caused by mechanical vibration. The magnetic shielding component 45 effectively attenuates external magnetic field interference generated by the annular permanent magnet 8. The through slot ensures smooth relative movement between the magnetic scale 5 and the encoder 4.

[0034] Reference Figure 1-7 As shown, in an optional embodiment: the stator assembly is fixedly connected to the piston rod 39, and the damper outer cylinder 41 is fixedly connected to the mover assembly and is guided by the upper guide ring 11 of the motor mover, the lower guide ring 42 of the motor mover and the inner guide sleeve 6 of the magnet.

[0035] It should be noted that the rigid connection between the stator assembly and the piston rod 39 ensures structural strength and avoids loosening of the assembly due to thermal expansion and contraction.

[0036] Reference Figure 1-7 As shown, in an optional embodiment: a buffer pad 20 is provided on the inner top surface of the motor lower end cover 43, and a fastener 19 is threadedly connected to the bottom of the liquid-cooled iron core 16. The fastener 19 is located on the top of the buffer pad 20, and the bottom inner side of the liquid-cooled iron core 16 is threadedly connected to the damper outer cylinder 41.

[0037] It should be noted that the buffer pad 20 can effectively absorb the impact energy during the operation of the actuator assembly, and can also prevent the loosening of the internal structure of the suspension actuator due to excessive deformation, making the structure of the suspension actuator more stable and reliable.

[0038] Reference Figure 1-7 As shown, in an optional embodiment: the encoder 4 includes an encoder harness 2 at its top, a receiving groove is fitted on the outer wall of the motor outer sleeve 9, a spring 27 is provided between the receiving groove and the upper end cover 22 of the coil, and an air passage 21 is provided on the bottom surface of the buffer pad 20, the air passage 21 passing through the lower lifting lug 44.

[0039] It should be noted that the encoder harness 2 passes through the tower top 1 and the upper end cover 22 of the coil, which realizes the limitation of the encoder harness 2, making it neater and convenient for long-term use of this suspension actuator. The receiving groove is set to support the spring 27.

[0040] Reference Figure 1-7 As shown, in an optional embodiment: a liquid passage end cap 10 is provided at the upper end of the liquid-cooled iron core 16, an O-ring 31 is provided between the liquid-cooled iron core 16 and the liquid passage end cap 10, and a rubber pad 17 and an O-ring 31 are provided between the liquid-cooled iron core 16 and the fastener 19 to seal the flow of coolant in the liquid-cooled iron core 16.

[0041] It should be noted that the O-ring 31 and rubber pad 17 make it less likely for coolant to leak inside the liquid-cooled iron core 16, thereby reducing the failure rate of this suspension actuator.

[0042] Reference Figure 1-7 As shown, in an optional embodiment, the tower top 1 and the upper end cover 22 of the coil are provided with wire holes for the lead-out of the motor mover coil harness 23.

[0043] It should be noted that the wire passage holes on the top of the tower 1 and the upper end cover 22 of the coil allow the motor mover coil harness 23 to be led out, restricting the position of the motor mover coil harness 23, making it neater and facilitating the long-term use of this suspension actuator.

[0044] Reference Figure 1-7 As shown, in an optional embodiment: the upper guide ring 11 and the lower guide ring 42 of the motor mover cooperate with the inner guide sleeve 6 of the magnet for guidance. The inner surfaces of the upper guide ring 11 and the lower guide ring 42 of the motor mover are both provided with threads and are threadedly connected to the liquid-cooled iron core 16 to fix the motor mover coil 14 between the upper guide ring 11 and the lower guide ring 42 of the motor mover.

[0045] It should be noted that the upper guide ring 11 and the lower guide ring 42 of the motor mover are connected to the liquid-cooled iron core 16 by a threaded connection, which has high reliability, ensuring both guiding accuracy and reducing assembly difficulty.

[0046] Working Principle: The linear motor provides the active force that acts on the vehicle body, solving the problem that the magnetorheological damper can only output force in the opposite direction of relative motion. Compared to a semi-active suspension, this further improves comfort. Furthermore, compared to an active suspension, the magnetorheological damper can supplement some of the linear motor's output, thus reducing power consumption. In addition, the DC motor can provide greater damping force at low speeds to compensate for the magnetorheological damper's shortcomings, ensuring handling stability. Moreover, the magnetorheological damper can operate independently, improving system robustness. It should be noted that in the motor stator, the magnetization directions of adjacent permanent magnets in the annular permanent magnet 8 rotate at a fixed 90-degree angle, with four permanent magnets forming a cycle. This strengthens the magnetic field inside the motor stator while weakening the magnetic field on the outside.

[0047] The coolant flows in the S-shaped cooling channel, which reduces the temperature of the liquid-cooled iron core 16. Since the liquid-cooled iron core 16 is in contact with the motor mover coil 14, it can quickly remove the heat generated by the motor mover coil 14, thereby reducing the temperature fluctuation of the linear motor and ensuring that the motor mover coil 14 does not fail due to excessive temperature, and can still maintain stable performance output during long-term operation.

[0048] This hybrid active suspension actuator has three operating modes: energy recovery mode, active drag mode, and active thrust mode. In energy recovery mode, vehicle vibration drives a linear motor to cut magnetic field lines, generating electrical energy that can be recovered and stored in the battery. In active drag mode, when the force required by the hybrid suspension actuator is opposite to the direction of vibration, the required force can be largely provided by the magnetorheological damper, achieving a large damping force with relatively low power and effectively reducing power consumption. In active thrust mode, only when the force required by the hybrid suspension actuator is in the same direction as the vibration, the required force can only be provided by the linear motor. To reduce the energy consumption of the linear motor in this condition, the damping coefficient of the magnetorheological damper is adjusted to the minimum, minimizing the drag opposite to the vibration direction, thereby reducing the power consumption of the linear motor in this condition.

[0049] Since most of the damping force of this hybrid active suspension can be provided by the magnetorheological damper, the rated force requirement of the linear motor is significantly reduced, thereby significantly reducing the cost of the linear motor.

[0050] By using a parallel configuration of a magnetorheological damper and a linear motor, this hybrid active suspension can provide a larger damping force in active drag mode, resulting in lower energy consumption compared to drag generated entirely by the linear motor. In active thrust mode, the magnetorheological damper can adjust the damping coefficient to the minimum, thereby reducing drag in the opposite direction of vibration and further reducing energy consumption.

[0051] It is important to note that even if the linear motor fails, the magnetorheological damper can still function normally, preventing extreme vibrations in the vehicle and providing better safety.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hybrid suspension actuator, characterized by: The linear motor and the magnetorheological damper, the linear motor comprises a motor lower end cover (43), a stator assembly and a mover assembly, the stator assembly is coaxially arranged at the top surface edge of the motor lower end cover (43), and is sequentially provided with a motor outer sleeve (9), a ring-shaped permanent magnet (8) and a magnetic steel inner guide sleeve (6) from outside to inside, the mover assembly is coaxially arranged at the center of the top surface of the motor lower end cover (43), and is sequentially provided with a tower top (1), a coil upper end cover (22), a liquid path end cover (10), a motor mover upper guide ring (11), a magnetic separation plate (12), a motor mover coil (14), a liquid-cooled core (16) and a motor mover lower guide ring (42) from top to bottom. The inside of the liquid-cooled core (16) is provided with an S-shaped cooling channel around the central axis, and the two ports of the S-shaped cooling channel are located on the top surface of the liquid-cooled core (16) and are respectively connected with an inlet liquid conduit (46) and an outlet liquid conduit (47).

2. The hybrid suspension actuator of claim 1, wherein: The top surface of the liquid-cooled core (16) is provided with a plurality of hole grooves penetrating the bottom surface of the liquid-cooled core (16) around the central axis, the hole grooves comprise a first upper port (461), a second upper port (464) and a last upper port (471) on the top surface of the liquid-cooled core (16), the hole grooves comprise a first lower port (462), a second lower port (463) and a last lower port (472) on the bottom surface of the liquid-cooled core (16), the first upper port (461) is connected with the inlet liquid conduit (46), the last upper port (471) is connected with the outlet liquid conduit (47), the inlet liquid conduit (46) and the outlet liquid conduit (47) pass through the coil upper end cover (22) and the tower top (1) upwards, the cooling liquid enters the first upper port (461) through the inlet liquid conduit (46), then flows out from the first lower port (462) downwards and flows to the second lower port (463) through the setting of the bottom surface communication groove (48) of the liquid-cooled core (16), the cooling liquid then enters the second lower port (463), then flows out from the second upper port (464) upwards and continues to flow in an S-shaped manner on the side wall of the liquid-cooled core (16) through the setting of the top surface communication groove (48) of the liquid-cooled core (16), and the cooling liquid finally enters the last lower port (472), flows out upwards through the last upper port (471) and the outlet liquid conduit (47).

3. The hybrid suspension actuator of claim 2, wherein: The magnetorheological damper comprises a damper outer cylinder (41), a damper upper end cover (24), an air cavity (25), a floating piston (29), an upper chamber (30), a piston assembly, a lower chamber (15), a buffer block (40), a guide (18) and a lower hanger (44), the piston assembly comprises a stop ring (13), a magnetic conducting plate (32), a piston core (33), a piston excitation coil (34), a coil skeleton (35), a piston lower guide belt (36), a piston outer cylinder (37), a piston lower end cover (38) and a piston rod (39), the piston assembly is slidably connected to the inner side wall of the damper outer cylinder (41), an annular flow channel communicating the upper chamber (30) and the lower chamber (15) is arranged on the piston assembly, the piston rod (39) is slidably connected with the guide (18), the piston excitation coil (34) is used for generating a magnetic field, the magnetic field intensity at the annular flow channel is changed by applying different current sizes, the viscosity of the magnetorheological fluid is changed, and finally the damping coefficient of the magnetorheological damper is changed, and the floating piston (29) is provided with a floating piston guide belt (28) and a floating piston air-tight ring (7).

4. The hybrid suspension actuator of claim 3, wherein: The top of the magnetic steel inner guide sleeve (6) is provided with a fixed support (3), the fixed support (3) is fixedly connected with an encoder (4), the outer side of the damper outer cylinder (41) is sleeved with an isolation sleeve (26) above the liquid path end cover (10), the outer side of the isolation sleeve (26) is provided with a magnetic scale (5), the encoder (4) is suspended above the magnetic scale (5) and is used for measuring the displacement of the isolation sleeve (26), the isolation sleeve (26) is provided with a magnetic shielding member (45), the magnetic shielding member (45) is located outside the encoder (4) and is used for reducing the influence of the annular permanent magnet (8), and a through groove is formed in the magnetic shielding member (45) and is used for relative movement of the magnetic scale (5) and the encoder (4).

5. A hybrid suspension actuator according to claim 4, wherein: The stator assembly is fixedly connected with the piston rod (39), the damper outer cylinder (41) is fixedly connected with the rotor assembly and is guided by the motor rotor upper guide ring (11), the motor rotor lower guide ring (42) and the magnetic steel inner guide sleeve (6).

6. A hybrid suspension actuator according to claim 5, wherein: The inner top surface of the motor lower end cover (43) is provided with a buffer pad (20), the bottom of the liquid-cooled iron core (16) is threadedly connected with a fastener (19), the fastener (19) is located at the top of the buffer pad (20), and the bottom inner side surface of the liquid-cooled iron core (16) is threadedly connected with the damper outer cylinder (41).

7. A hybrid suspension actuator according to claim 6, wherein: The encoder (4) comprises an encoder wire harness (2) at the top thereof, the outer side wall of the motor outer sleeve (9) is sleeved with a receiving groove body, the spring (27) is arranged between the receiving groove body and the coil upper end cover (22), the bottom surface of the buffer pad (20) is provided with an air passing groove (21), and the air passing groove (21) penetrates out from the lower hanger (44).

8. The hybrid suspension actuator of claim 7, wherein: The upper end of the liquid-cooled core (16) is provided with a liquid path end cover (10), an O-shaped ring (31) is arranged between the liquid-cooled core (16) and the liquid path end cover (10), and a rubber pad (17) and an O-shaped ring (31) are arranged between the liquid-cooled core (16) and the fastener (19) to seal the flow of the cooling liquid in the liquid-cooled core (16).

9. A hybrid suspension actuator according to claim 8, wherein: The tower top (1) and the coil upper end cover (22) are provided with wire holes for leading out the motor rotor coil wire harness (23).

10. The hybrid suspension actuator of claim 9, wherein: The motor rotor upper guide ring (11) and the motor rotor lower guide ring (42) are guided by the magnetic steel inner guide sleeve (6), the inner sides of the motor rotor upper guide ring (11) and the motor rotor lower guide ring (42) are provided with threads and are threadedly connected with the liquid-cooled core (16) to fix the motor rotor coil (14) between the motor rotor upper guide ring (11) and the motor rotor lower guide ring (42).

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