Damping-adjustable magnetorheological hybrid active suspension

Abstract

The utility model discloses a magnetorheological hybrid active suspension with adjustable damping, and belongs to the technical field of vehicle vibration reduction. The suspension comprises a rotating motor, a rotating magnetorheological damper, a lead screw assembly and the like. The rotary magneto-rheological damper comprises an outer stator, an inner rotor and a magnet exciting coil, and a magneto-rheological medium is filled between the inner rotor and the outer rotor; the lead screw assembly converts rotary motion into linear motion through a lead screw nut so as to adjust the height of the suspension. By controlling the current of the magnet exciting coil, the magnetorheological medium can be switched between low-viscosity Newtonian fluid and high-viscosity Bingham fluid, and a double-working-condition mode is achieved: in an active mode, the motor directly drives the lead screw to output active force; in the damping mode, the magnetorheological medium absorbs impact energy and compensates motor output, and energy consumption is greatly reduced. When the motor breaks down or turns at a high speed, by means of the characteristics of small current and large torque, required damping force can still be provided to reduce vibration and roll, and comfort and safety are guaranteed. The method has a wide application prospect in research, development and design of the hybrid active suspension of the vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle damping technology field, concretely is a kind of adjustable damping's magnetorheological hybrid active suspension. BACKGROUND

[0002] Suspension system is the important component of automobile, its function is to bear the weight of vehicle body and attenuate the vibration caused by uneven road to vehicle body, mainly involves the smoothness and steering stability of vehicle.

[0003] At present, automobile suspension is mainly divided into passive suspension, semi-active suspension and active suspension. Passive suspension can only obtain a compromise performance for various road conditions due to fixed stiffness and damping coefficient;Semi-active suspension can obtain performance inferior to active suspension in energy dissipation by adjusting damping coefficient, while reducing energy consumption;Active suspension can obtain optimal suspension performance by adjusting active force according to road conditions through actuator active output, so as to always maintain comfort and steering stability.

[0004] The existing active actuator generally adopts linear motor and air / hydraulic active suspension, the former requires larger axial installation space and higher energy consumption, the latter has long response time, poor real-time control effect and needs complex air / liquid transmission pipeline. While rotary motor is matched with mechanical transmission structure (such as ball screw, gear rack, etc.), it can realize active force control in limited suspension space, but due to the rotary inertia of rotary motor rotor and ball screw mechanism under high-speed rotating condition, it has certain influence on the control performance of suspension system, and the rigid connection between motor and screw structure will inevitably transmit vibration to vehicle body under high-speed axial impact, and also cause certain damage to the service life of active suspension actuator device itself.

[0005] Therefore, how to realize larger active control force output in limited suspension space, avoid high-speed axial impact hazards, reduce energy consumption and ensure rapid response has become a problem to be solved in the field of active suspension technology. UTILITY MODEL CONTENTS

[0006] The utility model aims at realizing larger active control force output in limited suspension space, avoiding high-speed axial impact hazards, reducing energy consumption and ensuring rapid response. In order to achieve the above purpose, the utility model provides a kind of adjustable damping's magnetorheological hybrid active suspension, comprising:

[0007] Rotary motor, rotary motor is fixedly installed in motor outer cylinder and is connected with screw assembly transmission, is used for driving screw assembly to change its own length adjustment vehicle body vibration change;

[0008] The rotary magnetorheological damper is provided with an outer stator, an inner rotor and an excitation coil, the inner rotor is fixedly connected with a screw rod assembly, the viscosity and shear yield strength of a magnetorheological medium filled between the outer stator and the inner rotor are changed by adjusting the current size of the excitation coil, so as to adjust the damping torque of the screw rod assembly connected with the inner rotor relative to the outer stator.

[0009] In some embodiments, the rotary magnetorheological damper comprises a damper shell, a damper front baffle and a sealing end cover for fixedly packaging the damper shell.

[0010] The damper shell is coaxially arranged from outside to inside in sequence with the excitation coil, the outer stator and the inner rotor; the outer stator is fixedly installed in the damper shell and fixedly packages the excitation coil between the outer stator and the damper shell; and the outer stator and the inner rotor are filled with the magnetorheological medium.

[0011] In some embodiments, the screw rod assembly comprises a screw rod outer cylinder, a front flange is fixedly installed at one end of the screw rod outer cylinder away from the rotary motor, the front flange is in sliding connection with the outer wall of the output lever, and is used for guiding directional sliding of the output lever.

[0012] One end of the output lever is fixedly installed with a screw nut, the other end is fixedly connected with an inner threaded plug, and is connected with a load connecting piece through the inner threaded plug; a cavity is arranged in the output lever, a screw rod engaged with the screw nut is arranged in the cavity, and one end of the screw rod is fixedly connected with the inner rotor.

[0013] In some embodiments, the rotary magnetorheological damper is located between the rotary motor and the screw rod assembly, and coaxially transmits the torque of the rotary motor to the screw rod assembly.

[0014] The rotary magnetorheological damper is located in the connecting seat and is fixedly connected with the inner wall of the connecting seat through the damper shell; one end of the connecting seat is fixedly connected with the motor outer cylinder through the mounting plate, and the other end is fixedly connected with the bearing seat.

[0015] A deep groove ball bearing is fixedly installed in the bearing seat, and one end of the bearing seat away from the motor outer cylinder is fixedly connected with the screw rod outer cylinder.

[0016] One end of the screw rod close to the inner rotor penetrates through the deep groove ball bearing into the connecting seat and is fixedly connected with the inner rotor.

[0017] In some embodiments, the output shaft of the rotary motor and the screw rod are respectively inserted and fixed at two ends of the inner rotor.

[0018] In some embodiments, the outer surface of the output shaft of the rotary motor is sleeved with a rear deep groove ball bearing and a damper rear flange.

[0019] The rear flange of the damper is fixedly connected with the damper shell; the output shaft of the rotary motor is rotatably connected with the rear flange of the damper through a rear deep groove ball bearing;

[0020] The outer surface of one end of the lead screw close to the rotary motor is sequentially sleeved with a sealing end cover, a front deep groove ball bearing and a front flange of the damper;

[0021] The front flange of the damper is fixedly connected with the front baffle of the damper; the lead screw is rotatably connected with the front flange of the damper through the front deep groove ball bearing; and the lead screw is interference-fitted with the sealing end cover.

[0022] In some embodiments, the rotary motor is located between the rotary magnetorheological damper and the lead screw assembly;

[0023] The rotary magnetorheological damper is located in the motor outer cylinder and is fixedly connected with the inner wall of the motor outer cylinder through the damper shell;

[0024] One end of the motor outer cylinder is fixedly connected with the bearing seat; and the end of the bearing seat away from the motor outer cylinder is fixedly connected with the lead screw outer cylinder.

[0025] In some embodiments, a deep groove ball bearing is fixedly installed in the bearing seat;

[0026] One end of the lead screw sequentially passes through the deep groove ball bearing, the rotary motor, the front baffle of the damper, the inner rotor and the damper shell, and is fixedly connected with the inner rotor.

[0027] In some embodiments, a sealing end cover, a front deep groove ball bearing and a front flange of the damper are sleeved between the outer surface of the lead screw and the front baffle of the damper; the front flange of the damper is fixedly connected with the front baffle of the damper; the lead screw is rotatably connected with the front flange of the damper through the front deep groove ball bearing; and the lead screw is interference-fitted with the sealing end cover;

[0028] A rear deep groove ball bearing and a rear flange of the damper are sequentially sleeved between the outer surface of the lead screw and the damper shell; the rear flange of the damper is fixedly connected with the damper shell; and the lead screw is rotatably connected with the rear flange of the damper through the rear deep groove ball bearing.

[0029] In some embodiments, the inner surface of the outer stator is provided with an outer disc, and the outer surface of the inner rotor is provided with an inner disc corresponding to the outer disc.

[0030] The utility model discloses beneficial effect lies in, through the rotation magnetorheological damper is introduced to the active suspension structure that rotation motor and screw rod subassembly constitute, utilize rotation magnetorheological damper inner magnetorheological medium can change the characteristic of fluid viscosity under different magnetic field intensity, make the vehicle receive high frequency excitation, high speed axial impact or the active suspension needs to be pulled down and lift, the utility model can change the parameter characteristic of rotation magnetorheological damper through the adjustment current size, provide damping torque to hybrid active suspension under low power consumption with the quick response of magnetorheological medium, compensate the active force of rotation motor, dissipate high speed axial impact, can recover part energy simultaneously.

[0031] And, since the utility model whole device structure design is compact, can provide sufficient suspension control force with low energy consumption in the limited suspension installation space. When the suspension rotation motor breaks down, rely on the characteristic of " small current provides big torque " of rotation magnetorheological damper, when the vehicle meets the bumpy road, still can provide the required damping force, reduce the body vibration, improve the suspension comfortability, when the vehicle high speed over the bend, still can increase the damping, make the outside suspension " hard " and reduce the vehicle roll, support the body and guarantee the driving safety. Have wide application prospect on the hybrid active suspension research and development design of real vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the sectional view of the utility model embodiment 1.

[0033] Figure 2 It is Figure 1 It is the partial enlarged view of the embodiment 1 shown.

[0034] Figure 3 It is the sectional view of the utility model embodiment 2.

[0035] Figure 4 It is Figure 3 It is the partial enlarged view of the embodiment 2 shown.

[0036] In the drawing: 1, rotation motor;2, mounting plate;3, damper rear flange;4, rear deep groove ball bearing;5, damper shell;6, excitation coil;7, outer stator;8, inner disc;9, outer disc;10, bearing seat;11, screw rod nut;12, screw rod;13, output lever;14, front flange;15, internal thread plug;16, screw rod outer tube;17, deep groove ball bearing;18, damper front flange;19, damper front baffle;20, front deep groove ball bearing;21, sealing end cover;22, connecting seat;23, inner rotor;24, motor outer tube. DETAILED DESCRIPTION

[0037] The utility model will be instructed in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the utility model, a number of changes and improvements can be made. These all belong to the protection scope of the utility model. Example 1

[0038] As Figures 1-2 The utility model provides a kind of adjustable damping's magnetorheological hybrid active suspension, comprising: rotary motor 1, the rotary motor 1 is fixedly installed in motor outer cylinder 24 and is connected with screw rod assembly transmission, for driving screw rod assembly changes its own length adjustment vehicle body vibration change;When vehicle is in the cooperation of many electronic elements such as vehicle-mounted sensor, perceives that vehicle vibrates due to road bump, vehicle-mounted control system will immediately control rotary motor 1 start, provides torque for screw rod assembly and drives screw rod assembly to change its height.For example, when vehicle passes through deceleration zone, wheel jumps due to the impact of deceleration zone, active suspension will transmit vibration to vehicle body, at this time, vehicle body has a upward spring acceleration, rotary motor 1 works and drives screw rod assembly height change, pulls down vehicle body, to keep vehicle body at constant height, reduce the external disturbance felt by driver and passenger, improve ride comfort;When vehicle needs greater grip, for example, high speed over bend or fast lane changing process, rotary motor 1 can also drive screw rod assembly height change, quickly push down tire and touch ground, ensure the grip of tire, reduce roll, quickly respond to lateral force change, stabilize vehicle posture, while maximize the driving force of car itself, to improve the handling stability of vehicle.

[0039] However, this vibration or damping demand is frequent in the process of vehicle driving, that is, rotary motor 1 needs to provide positive and negative torque repeatedly, and since rotary motor 1 rotor and screw rod have non-negligible moment of inertia under high-speed rotating condition, it has certain influence on the control performance of suspension system, and rotary motor 1 needs additional energy consumption to compensate the kinetic energy formed by the part of moment of inertia when switching positive and negative torque output, which also causes the increase of energy consumption of rotary motor 1 and the shortening of service life;Meanwhile, the rigid connection between rotary motor 1 and screw rod assembly will inevitably transmit vibration to vehicle body under high-speed axial impact. Therefore, in the embodiment, rotary motor 1 and screw rod assembly are connected together by rotary magnetorheological damper to overcome the additional consumption of rotary motor 1 torque caused by the above moment of inertia and reduce the influence of rigid connection between rotary motor 1 and screw rod assembly on vehicle body.

[0040] Specifically, refer to Figure 2As shown, the rotary magnetorheological damper is internally provided with an outer stator 7, an inner rotor 23 and an excitation coil 6, the inner rotor 23 can rotate relative to the outer stator 7, when the current flowing through the excitation coil 6 is changed, the magnetic field generated by the excitation coil 6 will change the viscosity and shear yield strength of the magnetorheological medium filled between the inner rotor 23 and the outer stator 7. When the screw rod assembly rotates due to axial impact or change in height, the rotational inertia or torque generated by the axial impact will be transmitted to the magnetorheological medium through the inner rotor 23 connected with the screw rod assembly to dissipate energy, thereby solving the influence of the above rotational inertia and axial impact on the damping of the vehicle body and the stability of the steering.

[0041] Optionally, the rotary magnetorheological damper comprises a damper shell 5 and a damper front baffle 19 and a sealing end cover 21 for fixedly packaging the damper shell 5; the damper shell 5 is coaxially arranged from outside to inside in sequence with the excitation coil 6, the outer stator 7 and the inner rotor 23; the outer stator 7 is fixedly installed in the damper shell 5 and fixedly packages the excitation coil 6 between the outer stator 7 and the damper shell 5; the magnetorheological medium is filled between the outer stator 7 and the inner rotor 23.

[0042] Specifically, the entire rotary magnetorheological damper is fixedly installed in the connecting seat 22 through the damper shell 5, the inner rotor 23 can rotate relative to the outer stator 7, and because the magnetorheological medium is filled between the inner rotor 23 and the outer stator 7, in order to avoid leakage of the magnetorheological medium, a sealing end cover 21 is additionally installed on the side of the front deep groove ball bearing 20 close to the inner rotor 23 when the damper shell 5 is packaged, the sealing end cover 21 is a common sealing structure, the outer ring of which is generally provided with a sealing ring, which can be limited at the inner rotor 23 through interference fit with the lead screw 12 and extrusion of the front deep groove ball bearing 20 and the damper front flange 18, to realize blocking and sealing of the magnetorheological medium outside the inner rotor 23, and the specific sealing principle and structure are prior art. Optionally, the magnetorheological medium includes but is not limited to magnetorheological fluid (MRF). In detail, the magnetorheological fluid includes but is not limited to iron powder, active agent and silicon oil mixed to form. Among them, the mass component of the iron powder includes but is not limited to 60% of the total amount of the magnetorheological fluid, and the specific component should be appropriate to meet the required damping torque requirement under the use scene of the damping device.

[0043] When the excitation coil 6 fixedly installed in the outer stator 7 and the damper shell 5 is supplied with different sizes of current, the excitation coil 6 can change the size of the internal magnetic field of the entire rotating magneto-rheological damper, at this time the magneto-rheological fluid will change the viscosity and shear yield strength due to the change of the magnetic field size, for example, when the magnetic field strength is higher, the viscosity and shear yield strength of the magneto-rheological fluid will be larger, and the damping torque provided for the inner rotor 23 will be larger accordingly; when the magnetic field strength is lower, the viscosity and shear yield strength of the magneto-rheological fluid will be smaller, and the damping torque provided for the inner rotor 23 will be smaller accordingly, so that the damping torque of the entire active suspension can be quickly and efficiently adjusted by flexibly changing the size of the current, thereby providing protection for efficient damping of the vehicle.

[0044] Optionally, the lead screw assembly comprises a lead screw outer cylinder 16, one end of the lead screw outer cylinder 16 is fixedly installed with a front flange 14 away from the rotary motor 1, the front flange 14 is in sliding connection with the outer wall of the output rod 13, and is used for guiding directional sliding of the output rod 13; one end of the output rod 13 is fixedly installed with a lead screw nut 11, the other end is fixedly connected with an internal thread plug 15, and is connected with the load connecting piece through the internal thread plug 15; the inside of the output rod 13 is provided with a cavity, the cavity is arranged with a lead screw 12 engaged with the lead screw nut 11, and one end of the lead screw 12 is fixedly connected with the inner rotor 23.

[0045] Specifically, when the lead screw 12 rotates under the drive of the rotary motor 1, the lead screw nut 11 will move linearly along the height direction of the lead screw 12 through the thread engagement transmission between the lead screw 12 and the lead screw nut 11; since the output rod 13 is fixedly connected with the lead screw nut 11 and is in sliding connection with the front flange 14, the lead screw nut 11 will synchronously drive the output rod 13 to stretch or contract in the lead screw outer cylinder 16, so as to pull down or lift up the vehicle body when the vehicle encounters external disturbance and vibrates, thereby keeping the vehicle body at a constant height and improving comfort. The type of the lead screw 12 is not unique, including but not limited to ball screw, roller screw, etc., and engineering personnel can flexibly select according to the use scene, performance index, service life, maintenance cost and the like.

[0046] Optionally, in order to avoid the accidental synchronous rotation of the screw nut 11 and the screw 12 during the linear movement of the screw nut 11 along the height direction of the screw 12, a circumferential limiting structure can be additionally arranged between the screw nut 11 and the cylinder wall of the screw outer cylinder 16 or between the output rod 13 and the front flange 14, which includes but is not limited to a slider and a sliding groove structure. For example, a sliding groove can be formed in the inner wall of the screw outer cylinder 16 along the height direction thereof, and a slider can be arranged on the outer surface of the screw nut 11 and inserted into the sliding groove. When the screw nut 11 moves along the height direction of the screw 12, the slider slides along the sliding groove, which does not hinder the linear movement of the screw nut 11 and prevents the circumferential rotation of the screw nut 11, thereby ensuring the stability of the driving of the output rod 13.

[0047] Optionally, the rotary magnetorheological damper is located between the rotary motor 1 and the screw assembly and coaxially transmits the torque of the rotary motor 1 to the screw assembly; the rotary magnetorheological damper is located in the connecting seat 22 and fixedly connected with the inner wall of the damper housing 5; one end of the connecting seat 22 is fixedly connected with the motor outer cylinder 24 through the mounting plate 2, and the other end is fixedly connected with the bearing seat 10.

[0048] Optionally, the deep groove ball bearing 17 is fixedly installed in the bearing seat 10, and one end of the bearing seat 10 away from the motor outer cylinder 24 is fixedly connected with the screw outer cylinder 16; one end of the screw 12 close to the inner rotor 23 penetrates through the deep groove ball bearing 17 into the connecting seat 22 and is fixedly connected with the inner rotor 23.

[0049] Optionally, the output shaft of the rotary motor 1 and the screw 12 are respectively inserted and fixed at two ends of the inner rotor 23.

[0050] Optionally, the output shaft of the rotary motor 1 is sleeved with the rear deep groove ball bearing 4 and the damper rear flange 3.

[0051] The damper rear flange 3 is fixedly connected with the damper housing 5; the output shaft of the rotary motor 1 is rotatably connected with the damper rear flange 3 through the rear deep groove ball bearing 4.

[0052] The outer surface of one end of the screw 12 close to the rotary motor 1 is sequentially sleeved with the sealing end cover 21, the front deep groove ball bearing 20 and the damper front flange 18.

[0053] The damper front flange 18 is fixedly connected with the damper front baffle 19; the screw 12 is rotatably connected with the damper front flange 18 through the front deep groove ball bearing 20; the screw 12 is in interference fit with the sealing end cover 21.

[0054] Specifically, the lead screw 12 in the screw assembly and the output shaft of the rotary motor 1 can be respectively inserted and fixed in the two ends of the inner rotor 23 through the key connection mode, and then the coaxiality of the three is ensured through the support of the front deep groove ball bearing 20, the rear deep groove ball bearing 4 and the deep groove ball bearing 17 limited by the front damper flange 18 and the rear damper flange 3, thereby strengthening the stability of the connection and torque transmission process of the three. At the same time, the front deep groove ball bearing 20, the rear deep groove ball bearing 4 and the deep groove ball bearing 17 can further reduce the rotating resistance of the three, and ensure the efficiency and sensitivity of the active force adjustment.

[0055] Specifically, when the vehicle suspension needs to be adjusted by active force control, the excitation coil 6 is not energized, and the magnetorheological medium between the outer stator 7 and the inner rotor 23 presents the low-viscosity Newtonian fluid characteristics. At this time, the rotary motor 1 starts to transmit torque to the lead screw 12 through the output shaft and the inner rotor 23, and the rotating lead screw 12 moves the ball screw nut 11 along the height direction of the lead screw 12 through the threaded engagement transmission, and then synchronously drives the output rod 13 to extend or retract in the lead screw outer cylinder 16 to achieve the required active force under specific working conditions. During the whole process, the outer stator 7 remains in a stationary state, the inner rotor 23 rotates relative to the outer stator 7, and the whole active force transmission path does not consume damping energy.

[0056] When the vehicle suspension needs to be controlled by active control to lower or lift the suspension (the rotary motor 1 is expected to control the rotation direction opposite to the current rotation direction of the lead screw 12), is excited by high frequency, is subjected to high-speed axial impact, or needs to change the vehicle ride comfort by adjusting the damping, the excitation coil 6 is energized, the current size is adjusted, and the magnetorheological medium between the outer stator 7 and the inner rotor 23 presents the high-viscosity, low-flow Bingham fluid characteristics.

[0057] Further, when the rotation direction of the lead screw 12 and the rotary motor 1 needs to be switched, the rotational inertia of the previous rotation direction will be absorbed and consumed by the magnetorheological medium, and the damping torque direction provided by the magnetorheological medium is consistent with the rotation direction of the lead screw 12 after switching and the driving direction of the rotary motor 1, thereby compensating most of the output of the rotary motor 1 during the switching of the rotation direction through the damping torque, achieving rapid damping response and reducing energy consumption. At the same time, the high-frequency excitation and high-speed axial impact from the outside will be converted into the rotating torque of the lead screw 12 by the threaded engagement transmission ball between the lead screw 12 and the ball screw nut 11, and the high-viscosity magnetorheological medium can dissipate this impact rotational energy, further reducing the vibration of the vehicle body and prolonging the service life of the device.

[0058] Optionally, in order to further enhance the damping effect of the magnetorheological medium after magnetization, an outer disk 9 can be provided on the inner surface of the outer stator 7, and an inner disk 8 can be provided on the outer surface of the inner rotor 23. The inner disk 8 and the outer disk 9 correspond one-to-one like comb teeth, thereby indirectly expanding the effective area of ​​the magnetorheological medium on the inner rotor 23 and the outer stator 7, increasing the damping torque and making the magnetorheological medium more sensitive to the adjustment and response of the damping torque.

[0059] Optionally, in this embodiment, the rotating motor 1 can be selected from a wind-cooled three-phase permanent magnet synchronous integrated motor (PMSM) developed by TRANSFLUID or a 48V mild hybrid system iBSG6HP electric generator integrated machine from Shanghai Valeo, or other motor models that can realize energy recovery, with both motor and generator modes, so as to realize energy recovery in damping mode. Example 2

[0060] like Figures 3-4 As shown, this embodiment 2 provides an adjustable damping magnetorheological hybrid active suspension. The difference from embodiment 1 is that the rotary motor 1 is located between the rotary magnetorheological damper and the lead screw assembly. The rotary magnetorheological damper is located inside the motor outer cylinder 24 and is fixedly connected to the inner wall of the motor outer cylinder 24 via the damper housing 5. One end of the motor outer cylinder 24 is fixedly connected to the bearing seat 10; the end of the bearing seat 10 away from the motor outer cylinder 24 is fixedly connected to the lead screw outer cylinder 16. Optionally, a deep groove ball bearing 17 is fixedly installed inside the bearing seat 10; one end of the lead screw 12 passes sequentially through the deep groove ball bearing 17, the rotary motor 1, the damper front baffle 19, the inner rotor 23, and the damper housing 5, and is fixedly connected to the inner rotor 23.

[0061] Specifically, similar to the principle in Embodiment 1, when the rotary motor 1 drives the lead screw 12 to rotate, the rotating lead screw 12 will drive the lead screw nut 11, which meshes with it, to move along the height direction of the lead screw 12 through the threaded engagement transmission with the inner circulating balls. This, in turn, synchronously drives the output lever 13 to extend and retract relative to the outer cylinder 16 of the lead screw, thereby achieving the required active force under specific working conditions. Simultaneously, external high-frequency excitation and high-speed axial impact are converted into rotational torque of the lead screw 12 by the threaded engagement transmission with the balls between the lead screw 12 and the lead screw nut 11. The high-viscosity magnetorheological medium can dissipate this impact rotational energy, further reducing vehicle vibration and extending the service life of the device.

[0062] Optionally, the sealing end cover 21, the front deep groove ball bearing 20 and the damper front flange 18 are sleeved between the outer surface of the lead screw 12 and the damper front baffle 19, the damper front flange 18 is fixedly connected with the damper front baffle 19, the lead screw 12 is rotatably connected with the damper front flange 18 through the front deep groove ball bearing 20, and the lead screw 12 is in interference fit with the sealing end cover 21; the rear deep groove ball bearing 4 and the damper rear flange 3 are sequentially sleeved between the outer surface of the lead screw 12 and the damper housing 5, the damper rear flange 3 is fixedly connected with the damper housing 5, and the lead screw 12 is rotatably connected with the damper rear flange 3 through the rear deep groove ball bearing 4. That is, the coaxiality of the lead screw 12 and the inner rotor 23 is ensured through the cooperation of the damper front flange 18 and the damper rear flange 3, the support of the front deep groove ball bearing 20, the rear deep groove ball bearing 4 and the deep groove ball bearing 17, and the rotation flexibility between the lead screw 12 and the damper front baffle 19 and the damper housing 5 is ensured through the front deep groove ball bearing 20 and the rear deep groove ball bearing 4.

[0063] Optionally, in order to further strengthen the damping effect of the magneto-rheological medium after being magnetized, the outer disc 9 is arranged on the inner surface of the outer stator 7, and the inner disc 8 is arranged on the outer surface of the inner rotor 23; the inner disc 8 and the outer disc 9 are one-to-one corresponding and similar to comb teeth, so that the effective area of the magneto-rheological medium on the inner rotor 23 and the outer stator 7 is virtually enlarged, the damping torque is increased, and the adjustment and response of the magneto-rheological medium to the damping torque are more sensitive.

[0064] Optionally, in the embodiment, the rotary motor 1 needs to be penetrated by one end of the lead screw 12, so as to meet the above structure layout mode, the rotary motor 1 can select a frameless motor in the prior art, such as a KBM frameless servo / torque motor of KOLLMORGEN company or a JY frameless torque motor produced by Jingyue Technology, to meet the use requirement.

[0065] In summary, the utility model introduces the rotary magneto-rheological damper into the active suspension composed of the rotary motor 1 and the lead screw-lead screw nut structure, on the one hand, the viscosity and shear yield strength of the magneto-rheological medium filled in the rotary magneto-rheological damper can be changed under the action of different electromagnetic fields, so as to overcome the rotational inertia of the lead screw 12 and provide the same direction damping torque for the steering drive of the rotary motor 1, compensate for the remaining part of the output of the rotary motor 1, and effectively reduce the energy consumption; on the other hand, the high-frequency excitation and high-speed axial impact received by the vehicle outside are converted into the rotational torque of the lead screw 12 through the thread engagement transmission cooperation ball by the characteristics of the lead screw-lead screw nut structure and the rapid response of the magneto-rheological medium, and then the rotational energy is dissipated through the rotary magneto-rheological damper, so as to avoid the direct impact on the rotary motor 1, the lead screw assembly and the vehicle body, and ensure the service life of the active suspension.

Claims

1. A magnetorheological fluid hybrid active suspension with adjustable damping, characterized in that, The application relates to a rotating motor (1) fixedly installed in a motor outer cylinder (24) and in transmission connection with a screw rod assembly, which is used for driving the screw rod assembly to change the length of the screw rod assembly to adjust the vibration change of a vehicle body. The rotating magnetorheological damper is provided with an outer stator (7), an inner rotor (23) and an excitation coil (6), the inner rotor (23) is fixedly connected with the screw rod assembly, the viscosity and shear yield strength of a magnetorheological medium filled between the outer stator (7) and the inner rotor (23) are changed by adjusting the current size of the excitation coil (6), and the damping torque of the inner rotor (23) connected with the screw rod assembly relative to the outer stator (7) is adjusted. The rotating magnetorheological damper comprises a damper shell (5) and a damper front baffle (19) and a sealing end cover (21) fixedly encapsulating the damper shell (5).

2. The adjustable-damping magnetorheological hybrid active suspension of claim 1, wherein: The damper shell (5) is coaxially arranged from outside to inside in sequence with the excitation coil (6), the outer stator (7) and the inner rotor (23); the outer stator (7) is fixedly installed in the damper shell (5) and encapsulates the excitation coil (6) between the outer stator (7) and the damper shell (5); and the outer stator (7) and the inner rotor (23) are filled with the magnetorheological medium. The screw rod assembly comprises a screw rod outer cylinder (16), one end of the screw rod outer cylinder (16) away from the rotating motor (1) is fixedly installed with a front flange (14), the front flange (14) is in sliding connection with the outer wall of an output rod (13) and is used for guiding directional sliding of the output rod (13).

3. The adjustable-damping magnetorheological hybrid active suspension of claim 1, wherein: One end of the output rod (13) is fixedly installed with a screw rod nut (11), the other end is fixedly connected with an inner thread plug (15) and is connected with a load connecting piece through the inner thread plug (15); the output rod (13) is internally provided with a cavity, the cavity is arranged with the screw rod (12) in meshing connection with the screw rod nut (11), and one end of the screw rod (12) is fixedly connected with the inner rotor (23). The rotating magnetorheological damper is located between the rotating motor (1) and the screw rod assembly and coaxially transmits the torque of the rotating motor (1) to the screw rod assembly.

4. The adjustable damping magnetorheological hybrid active suspension of any one of claims 1-3, wherein: The rotating magnetorheological damper is located in a connecting seat (22) and is fixedly connected with the inner wall of the connecting seat (22) through the damper shell (5); one end of the connecting seat (22) is fixedly connected with the motor outer cylinder (24) through a mounting plate (2), and the other end is fixedly connected with a bearing seat (10). The bearing seat (10) is fixedly installed with a deep groove ball bearing (17), and one end of the bearing seat (10) away from the motor outer cylinder (24) is fixedly connected with the screw rod outer cylinder (16). One end of the screw rod (12) close to the inner rotor (23) penetrates through the deep groove ball bearing (17) into the connecting seat (22) and is fixedly connected with the inner rotor (23). The output shaft of the rotating motor (1) and the screw rod (12) are respectively inserted and fixed at two ends of the inner rotor (23).

5. The adjustable-damping magnetorheological hybrid active suspension of claim 4, wherein: The outer surface of the output shaft of the rotating motor (1) is sleeved with a rear deep groove ball bearing (4) and a damper rear flange (3).

6. The adjustable-damping magnetorheological hybrid active suspension of claim 5, wherein: ​ The damper rear flange (3) is fixedly connected with the damper shell (5); the output shaft of the rotary motor (1) is rotatably connected with the damper rear flange (3) through the rear deep groove ball bearing (4); The outer surface of one end of the lead screw (12) close to the rotary motor (1) is sequentially sleeved with the sealing end cover (21), the front deep groove ball bearing (20) and the damper front flange (18); The damper front flange (18) is fixedly connected with the damper front baffle (19); the lead screw (12) is rotatably connected with the damper front flange (18) through the front deep groove ball bearing (20); and the lead screw (12) is in interference fit with the sealing end cover (21).

7. The adjustable damping magnetorheological hybrid active suspension of any one of claims 1-3, wherein: The rotary motor (1) is located between the rotary magnetorheological damper and the lead screw assembly; The rotary magnetorheological damper is located in the motor outer cylinder (24) and is fixedly connected with the inner wall of the motor outer cylinder (24) through the damper shell (5); One end of the motor outer cylinder (24) is fixedly connected with the bearing seat (10); and the end of the bearing seat (10) away from the motor outer cylinder (24) is fixedly connected with the lead screw outer cylinder (16).

8. The adjustable-damping magnetorheological hybrid active suspension of claim 7, wherein: The deep groove ball bearing (17) is fixedly installed in the bearing seat (10); One end of the lead screw (12) sequentially passes through the deep groove ball bearing (17), the rotary motor (1), the damper front baffle (19), the inner rotor (23) and the damper shell (5), and is fixedly connected with the inner rotor (23).

9. The adjustable-damping magnetorheological hybrid active suspension of claim 8, wherein: The outer surface of the lead screw (12) and the damper front baffle (19) are sleeved with the sealing end cover (21), the front deep groove ball bearing (20) and the damper front flange (18); the damper front flange (18) is fixedly connected with the damper front baffle (19); the lead screw (12) is rotatably connected with the damper front flange (18) through the front deep groove ball bearing (20); the lead screw (12) is in interference fit with the sealing end cover (21); the outer surface of the lead screw (12) and the damper shell (5) are sequentially sleeved with the rear deep groove ball bearing (4) and the damper rear flange (3); the damper rear flange (3) is fixedly connected with the damper shell (5); and the lead screw (12) is rotatably connected with the damper rear flange (3) through the rear deep groove ball bearing (4).

10. The adjustable damping magnetorheological hybrid active suspension of claim 2, wherein: The inner surface of the outer stator (7) is provided with the outer disc (9), and the outer surface of the inner rotor (23) is provided with the inner disc (8) corresponding to the outer disc (9).

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