Suspension device and vehicle

Abstract

The present application relates to the technical fields of suspension device, and discloses a suspension device and a vehicle, wherein the first stator of the suspension device is connected with the first lifting lug; the first transmission structure comprises a first screw rod and a first nut assembly, the first nut assembly is fixedly connected with the first rotor of the first motor, and one end of the first screw rod is in transmission cooperation with the first nut assembly; the other end of the first screw rod is connected with the second lifting lug; the second stator is connected with the first lifting lug; the second transmission structure comprises a second screw rod and a second nut assembly, the second screw rod is fixedly connected with the second rotor of the second motor, and the second nut assembly has transmission cooperation state and self-locking state with the second screw rod; in the self-locking state, the second screw rod is relatively fixed with the second nut assembly when the second nut assembly is stressed in the axial direction; and the elastic member is connected between the second lifting lug and the second nut assembly. The suspension device can realize active adjustment of stiffness, active adjustment of damping, height adjustment and long-time height maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of suspension device, in particular to a suspension device and a vehicle. BACKGROUND

[0002] Traditional automobile suspension device usually adopts mechanical spring and hydraulic shock absorber to provide suspension and damping functions for the vehicle, but the suspension stiffness and damping cannot be adjusted. Active suspension generally realizes the adjustment of suspension stiffness and damping through sensors, control systems and actuators, and can also realize the active adjustment of suspension height, further can realize roll and pitch suppression, greatly improving the comfort, stability and maneuverability of the vehicle.

[0003] As one of the implementation ways of active suspension, electromagnetic suspension usually realizes active control of the suspension by controlling the strength and direction of electromagnetic force of the motor and cooperating with the corresponding mechanical structure. Some electromagnetic suspension schemes can also provide energy feedback function when generating damping. However, most of the electromagnetic suspensions have deficiencies in the comprehensiveness of active control function, and usually need to cooperate with other structures or components to realize the complete active suspension control function in theory. For example, some electromagnetic suspensions retain hydraulic damping units, or some electromagnetic suspensions need to cooperate with the hydraulic damping units of other components to realize the suspension damping and its adjustment function, and the control response speed is limited by the characteristics of the hydraulic system, which is lower than the control response speed of the traditional motor system; and the electromagnetic suspension can only realize short-time height keeping through the motor. SUMMARY

[0004] Therefore, the present application provides a suspension device and a vehicle to solve the problem that the traditional electromagnetic suspension can only realize short-time height keeping, so that the suspension device as a whole can realize the active adjustment of suspension device stiffness, damping active adjustment and energy recovery, active control ability of suspension device height adjustment and suspension device height keeping.

[0005] In a first aspect, the present application provides a suspension device, comprising a first lifting lug and a second lifting lug; further comprising a first motor, a first transmission structure, a second motor, a second transmission structure and an elastic member; the first motor comprises a first rotor and a first stator; the first stator is connected with the first lifting lug; the first transmission structure comprises a first lead screw and a first nut assembly, the first nut assembly is fixedly connected with the first rotor, one end of the first lead screw is in transmission cooperation with the first nut assembly; the other end of the first lead screw is connected with the second lifting lug; the second motor comprises a second rotor and a second stator; the second stator is connected with the first lifting lug; the second transmission structure comprises a second lead screw and a second nut assembly, the second lead screw is fixedly connected with the second rotor, the second nut assembly has a transmission cooperation state and a self-locking state with the second lead screw, in the transmission cooperation state, the second lead screw rotates under the drive of the second rotor and drives the second nut assembly to move in the axial direction; in the self-locking state, the second lead screw is relatively fixed with the second nut assembly when the second nut assembly is stressed in the axial direction; the elastic member is connected between the second lifting lug and the second nut assembly.

[0006] Beneficial effects: The overall suspension device can realize active adjustment of suspension device stiffness, active adjustment of damping, energy recovery, active control of suspension device height adjustment and suspension device height maintenance. Since the first motor and the second motor are both rotary motors, compared with hydraulic damping units and suspension devices with hydraulic damping units, the control response speed is faster; and since the second nut assembly has a transmission cooperation state and a self-locking state with the second lead screw, in the self-locking state, the second nut assembly cannot drive the second lead screw to rotate when stressed in the axial direction, so the suspension device can be fixed at the corresponding height to achieve the purpose of long-time height maintenance. Since one end of the first lead screw is in transmission cooperation with the first nut assembly, when the first nut assembly rotates around the axial direction under the drive of the first rotor, the first nut assembly can provide an axial driving force for the first lead screw, combined with the real-time mechanical support force generated by the elastic member, to realize real-time adjustment of the overall support force of the suspension, and further realize real-time adjustment of the target stiffness of the suspension. At the same time, the first lead screw and the first motor produce axial relative displacement, and the linear motion of the first lead screw in the axial direction can also drive the first nut assembly to rotate, and further drive the first rotor fixedly connected with the first nut assembly to rotate, so that the first rotor and the first stator of the first motor produce electromagnetic action to generate rotary resistance. By controlling the feedback power of the first motor, the target rotary resistance can be controlled, and the damping force of the suspension device can be adjusted, and at the same time the mechanical energy during the bouncing of the suspension device is converted into electrical energy for energy feedback.

[0007] In an alternative embodiment, one end of the first stator is fixedly connected with the second stator, and the other end is connected with the first lifting lug; one end of the first lead screw, which is away from the first lifting lug, is slidably penetrated through the second stator and connected with the second lifting lug.

[0008] Beneficial effects: The first motor and the second motor are arranged in sequence along the axial direction and coaxially, which can make the suspension device have higher radial structural compactness; at the same time, since the first lead screw is slidably penetrated through the second stator and connected with the second lifting lug, the height utilization of the suspension device in the axial direction is also relatively sufficient.

[0009] In an alternative embodiment, the second rotor is sleeved on the outer periphery of the second stator, the second lead screw is fixedly sleeved on the outer periphery of the second rotor, the second nut assembly is sleeved on the outer periphery of the second lead screw, and the elastic member is sleeved on the outer peripheries of the second lead screw and the first lead screw.

[0010] Beneficial effects: The second rotor is an outer rotor, the second stator is an inner stator, and both the second stator and the second rotor are hollow structures. The hollow structure can provide more space for the sliding penetration of the first lead screw, does not occupy the space for the axial movement of the first lead screw, ensures a relatively large axial space utilization rate, avoids rotation interference or friction with the first lead screw, and realizes independent control of the first motor and the second motor.

[0011] In an alternative embodiment, the second nut assembly comprises a first flange, the first flange is protrusively arranged on the outer periphery of the second nut assembly and located at one end away from the second lifting lug; and the elastic member is a spiral spring, one end of the spiral spring is sleeved on the outer periphery of the second nut assembly and abuts against the first flange.

[0012] Beneficial effects: The arrangement of the first flange can limit the spiral spring in the axial direction. The spiral spring applies an elastic force to the second nut assembly through the first flange, prevents the second nut assembly from rotating, and ensures that the second nut assembly can move linearly in the axial direction when the second motor is actively working. The spiral spring can bear and transmit most of the vertical force. When the first motor performs suspension device stiffness adjustment, the first motor output support force needs to correct and supplement the value of the suspension device stiffness, without bearing all the vertical force. This greatly reduces the load of the first motor and the size of the first motor.

[0013] In an alternative embodiment, the second nut assembly further comprises a planetary roller nut, the planetary roller nut is sleeved on the outer periphery of the second lead screw, and the friction angle of the planetary roller nut is greater than the thread inclination angle of the second lead screw.

[0014] In an alternative embodiment, the second motor further comprises a supporting cylinder and a first bearing; the supporting cylinder comprises a cylinder body and a second flange, the cylinder body is sleeved on the outer periphery of the first screw rod and fixedly penetrates the inner periphery of the second stator, and the second flange protrudes on the outer periphery of one end of the cylinder body; the second flange covers one end of the first motor and is detachably connected with the first motor; the first bearing is arranged between the cylinder body and the second rotor for supporting the second rotor.

[0015] Beneficial effects: the supporting cylinder is provided, which can provide a sliding penetration space for the first screw rod through the cylinder body, fix the second stator, and cover and detachably connect with the first motor through the second flange; the first bearing cooperates with the cylinder body to realize the rotational support of the second rotor.

[0016] In an alternative embodiment, the suspension device further comprises a first cover body and a sealing element; the first cover body is provided with a through hole, and is fixedly connected to one end of the cylinder body away from the second flange and covers the cylinder body, the second stator, the second rotor and the second screw rod; the sealing element is arranged on the inner periphery of one end of the cylinder body away from the second flange, and the first screw rod is slidably penetrated in the through hole and slidably sealed with the sealing element.

[0017] In an alternative embodiment, the suspension device further comprises a buffer pad, the first screw rod comprises a smooth section and a threaded section, and the threaded section is in transmission cooperation with the first nut assembly; a limiting protrusion is arranged between the threaded section and the smooth section; the buffer pad is sleeved on the outer periphery of the smooth section, one end of the buffer pad abuts against the limiting protrusion, and the other end of the buffer pad is adapted to be limited by the sealing element and the first cover body.

[0018] Beneficial effects: the limiting protrusion, the sealing element and the first cover body can be used as the first mechanical limit of one end of the first screw rod in the axial direction, and the buffer pad can buffer the action and impact of the first screw rod to protect the first cover body, the sealing element and the second motor.

[0019] In an alternative embodiment, the suspension device further comprises a second angle sensor arranged between the second motor and the first cover body for detecting the relative rotational speed between the second rotor and the second stator.

[0020] Beneficial effects: the second angle sensor can be used to detect the relative rotational speed between the second rotor and the second stator to better control the active work of the second motor.

[0021] In an alternative embodiment, the suspension device further comprises a shock pad sleeved on the outer periphery of the first screw rod and located between the second lifting lug and the first cover body.

[0022] In an alternative implementation, the second lifting lug comprises a bracket, a dust cover, a third flange and a lifting lug body; the first lead screw is detachably connected to the inner periphery of the bracket at the end away from the first lifting lug, and the dust cover is connected to the bracket at the end away from the first lifting lug; the third flange is fixedly sleeved on the outer periphery of the bracket and located at the end close to the first lifting lug, and the elastic member is connected between the third flange and the second nut assembly; and the lifting lug body protrudes from the outer periphery of the bracket.

[0023] Beneficial effects: The bracket can be used to detachably connect with the first lead screw, facilitating installation and disassembly. The dust cover can protect the interior space of the bracket from dust. The third flange can limit and fix the elastic member, preferably abutting against the elastic member. The lifting lug body can be connected with an external frame.

[0024] In an alternative implementation, the first motor further comprises a housing and a second bearing, the housing is detachably connected with the second flange; the first stator is fixedly connected inside the housing and sleeved on the outer periphery of the first rotor; the first nut assembly is sleeved on the outer periphery of the first lead screw, fixedly connected to the inner periphery of the first rotor, and rotatably connected with the housing through the second bearing.

[0025] Beneficial effects: The housing can not only fix the first motor, but also detachably connect with the second flange; the second bearing can rotatably support the first rotor.

[0026] In an alternative implementation, it further comprises a second cover and a limiting nut, the second cover is detachably connected to the housing at the end away from the second motor, an extension section protruding away from the second motor is arranged at the middle position of the second cover, an extension cavity in communication with the inner periphery of the first nut assembly is arranged inside the extension section, and the first lifting lug is connected to the extension section at the end away from the housing; and the limiting nut is fixedly connected to the outer periphery of the first nut assembly and located at the end close to the second cover, for limiting the first nut assembly.

[0027] In an alternative implementation, it further comprises a first angle sensor arranged between the second cover and the housing, for detecting the relative rotation speed between the first nut assembly and the housing.

[0028] In a second aspect, the present application further provides a vehicle comprising the above-mentioned suspension device. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0030] Figure 1 A first perspective view of a suspension device according to an embodiment of the present application;

[0031] Figure 2 A Figure 1 A sectional view along A-A in figure 1;

[0032] Figure 3 A Figure 2 A close-up view of B in figure 1;

[0033] Figure 4 A second perspective view of a suspension device according to an embodiment of the present application;

[0034] Figure 5 An exploded view of a suspension device according to an embodiment of the present application;

[0035] Figure 6 A partial sectional view of a suspension device (first motor, etc.) according to an embodiment of the present application;

[0036] Figure 7 Another partial sectional view of a suspension device (first motor, etc.) according to an embodiment of the present application;

[0037] Figure 8 A schematic view of a suspension device (second motor, etc.) according to an embodiment of the present application;

[0038] Figure 9 A sectional view of a suspension device (second motor, etc.) according to an embodiment of the present application;

[0039] Figure 10 A schematic view of a second nut assembly of a suspension device according to an embodiment of the present application;

[0040] Figure 11 A sectional view of a second transmission structure of a suspension device according to an embodiment of the present application;

[0041] Figure 12 A Figure 11 A close-up view of C in figure 1;

[0042] Figure 13 A schematic view of a suspension device (height adjustment zero position, damping position fully compressed) according to an embodiment of the present application;

[0043] Figure 14 schematic diagram of a suspension device (height adjustment zero position, damping position zero position) for an embodiment of the present application;

[0044] Figure 15 schematic diagram of a suspension device (height adjustment high position, damping position fully compressed) for an embodiment of the present application;

[0045] Figure 16 schematic diagram of a suspension device (height adjustment high position, damping position fully compressed) for an embodiment of the present application;

[0046] Figure 17 schematic diagram of a suspension device (height adjustment high position, damping position zero position) for an embodiment of the present application;

[0047] Figure 18 schematic diagram of a suspension device (height adjustment high position, damping position fully stretched) for an embodiment of the present application;

[0048] Figure 19 schematic diagram of a suspension device (height adjustment low position, damping position fully compressed) for an embodiment of the present application;

[0049] Figure 20 schematic diagram of a suspension device (height adjustment low position, damping position zero position) for an embodiment of the present application;

[0050] Figure 21 schematic diagram of a suspension device (height adjustment low position, damping position fully stretched) for an embodiment of the present application;

[0051] Figure 22 schematic diagram of a suspension device (height adjustment low position, damping position zero position) for an embodiment of the present application;

[0052] Figure 23 schematic diagram of a suspension device (height adjustment zero position, damping position zero position) for an embodiment of the present application;

[0053] Figure 24 schematic diagram of a suspension device (height adjustment high position, damping position zero position) for an embodiment of the present application.

[0054] BRIEF DESCRIPTION OF DRAWINGS:

[0055] 1, first lifting lug; 2, second lifting lug; 21, support; 22, dust cover; 23, third flange; 24, lifting lug body; 3, first motor; 31, first rotor; 32, first stator; 33, shell; 34, second bearing; 4, first transmission structure; 41, first lead screw; 411, smooth section; 412, threaded section; 413, limiting convex part; 42, first nut assembly; 5, second motor; 51, second rotor; 52, second stator; 53, support cylinder; 531, cylinder body; 532, second flange; 54, first bearing; 6, second transmission structure; 61, second lead screw; 62, second nut assembly; 621, first flange; 622, planetary roller nut; 7, elastic member; 8, first cover body; 9, sealing member; 10, buffer pad; 11, second angle sensor; 12, shock pad; 13, second cover body; 131, extension section; 14, limiting nut; 15, first angle sensor. DETAILED DESCRIPTION

[0056] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0057] The embodiments of the present application are described below with reference to the drawings. Figures 1 to 24

[0058] ​According to the embodiment of the present application, in one aspect, a suspension device is provided, comprising a first lug 1 and a second lug 2; further comprising a first motor 3, a first transmission structure 4, a second motor 5, a second transmission structure 6 and an elastic member 7; the first motor 3 comprises a first rotor 31 and a first stator 32; the first stator 32 is connected with the first lug 1; the first transmission structure 4 comprises a first lead screw 41 and a first nut assembly 42, the first nut assembly 42 is fixedly connected with the first rotor 31, and the first lead screw 41 is in transmission cooperation with the first nut assembly 42 at one end; the other end of the first lead screw 41 is connected with the second lug 2; the second motor 5 comprises a second rotor 51 and a second stator 52; the second stator 52 is connected with the first lug 1; the second transmission structure 6 comprises a second lead screw 61 and a second nut assembly 62, the second lead screw 61 is fixedly connected with the second rotor 51, and the second nut assembly 62 has transmission cooperation state and self-locking state with the second lead screw 61; in the transmission cooperation state, the second lead screw 61 rotates under the drive of the second rotor 51 and drives the second nut assembly 62 to move in the axial direction; in the self-locking state, the second lead screw 61 is relatively fixed with the second nut assembly 62 when the second nut assembly 62 is stressed in the axial direction; the elastic member 7 is connected between the second lug 2 and the second nut assembly 62.

[0059] The suspension device as a whole can realize active adjustment of the stiffness of the suspension device, active adjustment of the damping, energy recovery, active control of the height adjustment of the suspension device and the height maintenance of the suspension device. Since the first motor 3 and the second motor 5 are both rotary motors, the control response speed is faster compared with a hydraulic damping unit and a suspension device with the hydraulic damping unit. Moreover, since the second nut assembly 62 has transmission cooperation state and self-locking state with the second lead screw 61, the second nut assembly 62 cannot drive the second lead screw 61 to rotate when stressed in the axial direction in the self-locking state, so the suspension device can be fixed at a corresponding height to achieve the purpose of long-time height maintenance. Moreover, the first motor 3 and the second motor 5 can be independently controlled. Figures 13 to 24 The schematic diagram of different adjustment states of the suspension device.

[0060] In the specific embodiment, the second lug 2 is fixedly connected with an external frame, the first lug 1 is hinged with the external frame in the vertical axial direction, and a rubber bushing is arranged inside the first lug 1, which can provide a small degree of freedom in each direction.

[0061] Specifically, the active adjustment mode of the stiffness of the suspension device is that the first motor 3 is actively operated, the driving power of the first motor 3 is controlled, the first rotor 31 of the first motor 3 generates power for rotating around the axial direction, the first nut assembly 42 fixedly connected with the first rotor 31 provides axial driving power for the first lead screw 41, and the real-time mechanical support force generated by the elastic member 7 is combined to realize real-time adjustment of the overall support force of the suspension, and further realize real-time adjustment of the target stiffness of the suspension.

[0062] The damping adjustment mode of the suspension device is that the axial relative displacement of the first screw rod 41 and the first motor 3 is caused by the external force input when the suspension device jumps, the linear motion of the first screw rod 41 in the axial direction drives the first nut assembly 42 to rotate, and then drives the first rotor 31 fixedly connected with the first nut assembly 42 to rotate, so that the electromagnetic action between the first rotor 31 and the first stator 32 of the first motor 3 is generated, and the rotary resistance is generated. By controlling the feedback power of the first motor 3, the target rotary resistance can be controlled, and the damping force of the suspension device is adjusted, and at the same time the mechanical energy of the suspension device when jumping is converted into electric energy.

[0063] Further, when the suspension device is in the active stiffness adjustment state, the damping adjustment needs to be continued during driving. At this time, the driving power of the first motor 3 is calculated based on the active adjustment mode of the stiffness of the suspension device, and the feedback power of the first motor 3 calculated by the damping adjustment mode of the suspension device is deducted, and finally the power of the first motor 3 is obtained and the control of the first motor 3 is based on the power.

[0064] One way of the height adjustment of the suspension device is that the first motor 3 actively works, and by controlling the driving power of the first motor 3, the first rotor 31 of the first motor 3 generates the power rotating around the axial direction, and the first nut assembly 42 fixedly connected with the first rotor 31 of the first motor 3 drives the first screw rod 41 to generate the axial driving force, and drives the first screw rod 41 to move linearly along the axial direction to the specified position.

[0065] One way of the height adjustment of the suspension device is that the first motor 3 actively works, and by controlling the driving power of the first motor 3, the first rotor 31 of the first motor 3 generates the power rotating around the axial direction, and the first nut assembly 42 fixedly connected with the first rotor 31 of the first motor 3 drives the first screw rod 41 to generate the axial driving force, and drives the first screw rod 41 to move linearly along the axial direction to the specified position.

[0066] Another way of height adjustment of the suspension device is that the second motor 5 actively works, by controlling the driving power of the second motor 5, so that the second screw rod 61 fixedly connected with the second rotor 51 of the second motor 5 rotates around the axis for a set number of rotations, at this time, the second nut assembly 62 is in transmission cooperation with the second screw rod 61, thereby driving the second nut assembly 62 to move linearly along the axial direction, and the axial height adjustment is completed. Since the second nut assembly 62 is connected with the elastic member 7, the elastic force of the elastic member 7 can prevent the second nut assembly 62 from rotating with the second screw rod 61, and ensure that the second nut assembly 62 can move linearly along the axial direction.

[0067] Further, the power of the first motor 3 is set to be larger than that of the second motor 5, so that the short-time height adjustment function of the suspension device can be realized by the first motor 3, and the slow height adjustment of the suspension device can be realized by the second motor 5. When the second motor 5 alone adjusts the height of the suspension device, the compression amount of the elastic member 7 does not change, and the second nut assembly 62 moves as a whole.

[0068] Another way of height maintenance of the suspension device is realized by the self-locking state of the second nut assembly 62 and the second screw rod 61. After the second motor 5 completes the height adjustment of the suspension device, the driving state can be exited, and the second nut assembly 62 and the second screw rod 61 are in the self-locking state. When the second nut assembly 62 is stressed in the axial direction, the second screw rod 61 is relatively fixed with the second nut assembly 62, and it is not necessary to continuously provide driving power, so that the height maintenance of the suspension device can be realized for a long time.

[0069] In an embodiment, one end of the first stator 32 is fixedly connected with the second stator 52, and the other end is connected with the first lifting lug 1; the end of the first screw rod 41 away from the first lifting lug 1 is connected with the second lifting lug 2 after sliding through the second stator 52.

[0070] The first motor 3 and the second motor 5 are arranged in sequence along the axial direction and coaxially arranged, so that the suspension device has high radial structural compactness; at the same time, since the first screw rod 41 is connected with the second lifting lug 2 after sliding through the second stator 52, the height of the suspension device in the axial direction is also fully utilized. Compared with the traditional shock absorbing spring structure, the height increment of the suspension device in the axial direction in the embodiment is not large after realizing all the active functions of the suspension.

[0071] In an embodiment, the second rotor 51 is sleeved on the outer periphery of the second stator 52, the second screw rod 61 is fixedly sleeved on the outer periphery of the second rotor 51, the second nut assembly 62 is sleeved on the outer periphery of the second screw rod 61, and the elastic member 7 is sleeved on the outer periphery of the second screw rod 61 and the first screw rod 41.

[0072] The second rotor 51 is an outer rotor, the second stator 52 is an inner stator, and the second stator 52 and the second rotor 51 are both hollow structures, which can provide more space for the sliding penetration of the first lead screw 41, do not occupy the space for the axial movement of the first lead screw 41, ensure a large axial space utilization rate, and avoid rotation interference or friction with the first lead screw 41, thereby realizing the independent control of the first motor 3 and the second motor 5.

[0073] In one embodiment, the second nut assembly 62 comprises a first flange 621, which is protrudingly arranged at the outer periphery of the second nut assembly 62 and located at one end away from the second lug 2; and the elastic member 7 is a coil spring, one end of which is sleeved on the outer periphery of the second nut assembly 62 and abuts against the first flange 621.

[0074] The arrangement of the first flange 621 can limit the coil spring in the axial direction, and the coil spring applies an elastic force to the second nut assembly 62 through the first flange 621 to prevent the second nut assembly 62 from rotating, so as to ensure that the second nut assembly 62 can move linearly in the axial direction when the second motor 5 is actively working. The coil spring can bear and transmit most of the vertical force, and when the first motor 3 performs suspension device stiffness adjustment, the output support force of the first motor 3 needs to be corrected and supplemented by the corresponding suspension device stiffness, without bearing all the vertical force. This greatly reduces the load of the first motor 3 and reduces the size of the first motor 3.

[0075] In one embodiment, the second nut assembly 62 further comprises a planetary roller nut 622, which is sleeved on the outer periphery of the second lead screw 61, and the friction angle of the planetary roller nut 622 is greater than the thread inclination angle of the second lead screw 61.

[0076] The friction angle of the planetary roller nut 622 is greater than the thread inclination angle of the second lead screw 61, so that the planetary roller nut 622 can move linearly in the axial direction under the drive of the second lead screw 61, but when the planetary roller nut 622 is driven by a driving force in the axial direction, the planetary roller nut 622 is self-locked with the second lead screw 61 to keep fixed with each other. The planetary roller nut 622 and the second lead screw 61 form a planetary roller lead screw transmission structure with a large transmission ratio for the second transmission structure 6, so that a small-power second motor 5 can perform height adjustment. At the same time, the second transmission structure 6 with a large transmission ratio can realize the characteristics of mechanical self-locking, and realize long-time and power-consumption-free height maintenance.

[0077] As a convertible embodiment, the second nut assembly 62 can also be a common nut, and the friction angle of the common nut is greater than the thread inclination angle of the second lead screw 61, so that the common nut can move linearly in the axial direction under the drive of the second lead screw 61 and the limitation of the elastic member 7; but when subjected to an axial force, the common nut is fixed with the second lead screw 61 to achieve a self-locking state.

[0078] Specifically, the planetary roller nut 622 comprises a planetary roller support 21 and a plurality of planetary rollers connected in a circumferential direction around an inner periphery of the planetary roller support 21.

[0079] In one embodiment, the second motor 5 further comprises a support cylinder 53 and a first bearing 54; the support cylinder 53 comprises a cylinder body 531 and a second flange 532, the cylinder body 531 is sleeved on an outer periphery of the first screw rod 41 and is fixedly connected to an inner periphery of the second stator 52, the second flange 532 is protrudingly arranged on an outer periphery of one end of the cylinder body 531, the second flange 532 is coveringly arranged on one end of the first motor 3 and is detachably connected to the first motor 3; the first bearing 54 is arranged between the cylinder body 531 and the second rotor 51 and is used for supporting the second rotor 51.

[0080] The support cylinder 53 is arranged to provide a sliding-through space for the first screw rod 41, to fix the second stator 52, and to cover and detachably connect the first motor 3 through the second flange 532; the first bearing 54 cooperates with the cylinder body 531 to realize rotational support of the second rotor 51.

[0081] Specifically, one end of the cylinder body 531 close to the second flange 532 is sequentially provided with a first stepped portion, a second stepped portion and a third stepped portion, the first stepped portion is close to the second flange 532, and the diameters of the first stepped portion, the second stepped portion and the third stepped portion sequentially decrease; the first bearing 54 is sleeved on an outer periphery of the second stepped portion, one end of the first bearing 54 abuts against an end face of the first stepped portion away from the second flange 532, and the other end of the first bearing 54 supports the second rotor 51; the first stepped portion separates the first bearing 54 from the second flange 532, facilitates connection between the second flange 532 and the first motor 3, and prevents the second rotor 51 from rubbing against the second flange 532 when rotating; the second stator 52 is sleeved on an outer periphery of the cylinder body 531 and abuts against an end face of the first stepped portion away from the second flange 532, the first stepped portion separates the first stator 32 from the first bearing 54, and avoids movement interference or friction. The second flange 532 and the first motor 3 are detachably connected through fasteners such as screws and bolts.

[0082] In one embodiment, the first cover 8 and the sealing member 9 are further arranged, the first cover 8 is provided with a through hole, the first cover 8 is fixedly connected to one end of the cylinder body 531 away from the second flange 532 and covers the cylinder body 531, the second stator 52, the second rotor 51 and the second screw rod 61; the sealing member 9 is arranged on an inner periphery of one end of the cylinder body 531 away from the second flange 532, the first screw rod 41 is slidingly arranged in the through hole and slidingly and sealingly cooperates with the sealing member 9.

[0083] The first cover body 8 can further increase the stability and integrity of the second motor 5 as a whole, and can protect the second motor 5 and the second transmission structure 6; and the sealing member 9 can achieve sliding sealing between the first screw rod 41 and the second motor 5.

[0084] In one embodiment, the suspension device further comprises a buffer pad 10, the first screw rod 41 comprises a smooth section 411 and a threaded section 412, the threaded section 412 is in transmission cooperation with the first nut assembly 42; a limiting protrusion 413 is arranged between the threaded section 412 and the smooth section 411; the buffer pad 10 is sleeved on the outer periphery of the smooth section 411, one end of the buffer pad 10 abuts against the limiting protrusion 413, and the other end of the buffer pad 10 is adapted to be limited by the sealing member 9 and the first cover body 8.

[0085] The limiting protrusion 413, the sealing member 9 and the first cover body 8 can serve as the first mechanical limit of one end of the first screw rod 41 in the axial direction. The buffer pad 10 can buffer the action and impact of the first screw rod 41, and protect the first cover body 8, the sealing member 9 and the second motor 5.

[0086] In one embodiment, the suspension device further comprises a second angle sensor 11 arranged between the second motor 5 and the first cover body 8, and used for detecting the relative rotation speed between the second rotor 51 and the second stator 52.

[0087] The second angle sensor 11 can be used to detect the relative rotation speed between the second rotor 51 and the second stator 52, so as to better control the active work of the second motor 5.

[0088] Specifically, the second angle sensor 11 is a rotary angle sensor. The first cover body 8 and the second motor 5 can form the third mechanical limit and the fourth mechanical limit of the second nut assembly 62 in the axial direction.

[0089] Further, during the height adjustment process of the suspension device, the current height position of the second nut assembly 62 can be obtained according to the relative rotation position between the second rotor 51 and the second stator 52 provided by the second angle sensor 11, the height position of the suspension device can be obtained in real time, the first upper stop position and the first lower stop position at the software level can be set, the relative position relationship between the current height position of the second nut assembly 62 and the first upper stop position and the first lower stop position set at the software level can be monitored in real time, and the current height position of the second nut assembly 62 and the height position of the suspension device are prevented from exceeding the first upper stop position and the first lower stop position set at the software level. The target is to prevent or reduce triggering of the third mechanical limit and the fourth mechanical limit during the height adjustment process of the suspension device by the second motor 5.

[0090] In one embodiment, the suspension device further comprises a shock pad 12 sleeved on the outer periphery of the first screw rod 41 and located between the second lifting lug 2 and the first cover body 8.

[0091] The shock pad 12 can form a shock buffering between the first lug 1 and the first cover 8.

[0092] In one embodiment, the second lug 2 comprises a bracket 21, a dust cover 22, a third flange 23 and a lug body 24; the end of the first lead screw 41 away from the first lug 1 is detachably connected to the inner periphery of the bracket 21, and the dust cover 22 is connected to the end of the bracket 21 away from the first lug 1; the third flange 23 is fixedly sleeved on the outer periphery of the bracket 21 and located at the end close to the first lug 1, and the elastic member 7 is connected between the third flange 23 and the second nut assembly 62; the lug body 24 protrudes on the outer periphery of the bracket 21.

[0093] The bracket 21 can be used for detachable connection with the first lead screw 41, facilitating installation and disassembly. The dust cover 22 can protect the internal space of the bracket 21 from dust. The third flange 23 can limit and fix the elastic member 7, preferably abutting against the elastic member 7. The lug body 24 can be connected with an external frame.

[0094] Specifically, the bracket 21 can be detachably connected with the end of the first lead screw 41 away from the first lug 1 through a fixing nut. The bracket 21 is internally provided with a partition plate, the partition plate is provided with a through hole, the outer periphery of the end of the first lead screw 41 away from the first lug 1 is provided with an external thread, a fourth step portion is arranged between the external thread and the smooth section 411, the fourth step portion abuts against the partition plate, and the external thread of the first lead screw 41 is detachably connected with the fixing nut through the through hole.

[0095] In one embodiment, the first motor 3 further comprises a housing 33 and a second bearing 34, the housing 33 is detachably connected with the second flange 532; the first stator 32 is fixedly connected inside the housing 33 and sleeved on the outer periphery of the first rotor 31; the first nut assembly 42 is sleeved on the outer periphery of the first lead screw 41, fixedly connected to the inner periphery of the first rotor 31, and rotatably connected with the housing 33 through the second bearing 34.

[0096] The housing 33 can fix the first motor 3 and detachably connect with the second flange 532; the second bearing 34 can rotatably support the first rotor 31.

[0097] Specifically, the first nut assembly 42 can be a ball nut assembly. The second bearing 34 has two groups, which are arranged at the two ends of the first nut assembly 42, respectively. The housing 33 comprises a straight cylinder portion and a flange portion, the two ends of the straight cylinder portion are respectively provided with the flange portion, the flange portion protrudes towards the inner periphery of the straight cylinder portion, the first rotor 31 and the first stator 32 are arranged between the two flange portions, the two flange portions are provided with a fifth step portion, and the fifth step portion separates the second bearing 34 from the second rotor 51.

[0098] In one embodiment, the second cover 13 is detachably connected to the shell 33 away from the second motor 5, and the middle position of the second cover 13 is provided with an extension section 131 protruding away from the second motor 5, the extension section 131 is internally provided with an extension cavity in communication with the inner periphery of the first nut assembly 42, and the first lug 1 is connected to the end of the extension section 131 away from the shell 33; and the limiting nut 14 is fixedly connected to the outer periphery of the first nut assembly 42 and located at the end close to the second cover 13, for limiting the first nut assembly 42.

[0099] The extension section 131 provides a space for the first lead screw 41 to move away from the second motor 5 in the axial direction, and the extension cavity of the extension section 131 also provides a second mechanical limit for the first lead screw 41 to move away from the second motor 5 in the axial direction. The limiting nut 14 limits the first nut assembly 42 of the first transmission structure 4 in the axial direction.

[0100] Specifically, the limiting protrusion 413 and the sealing element 9 and the first cover 8 can serve as a first mechanical limit for one end of the first lead screw 41 in the axial direction, and the extension cavity can serve as a second mechanical limit for the other end of the first lead screw 41 in the axial direction. When the external force input is too large or the required damping force exceeds the capacity of the first motor 3, the first mechanical limit and the second mechanical limit are used for mechanical limiting.

[0101] In one embodiment, the first angle sensor 15 is arranged between the second cover 13 and the shell 33, and is used to detect the relative rotation speed between the first nut assembly 42 and the shell 33.

[0102] The first angle sensor 15 can be used to detect the relative rotation speed between the first nut assembly 42 and the shell 33, so as to better control the active work of the first motor 3.

[0103] Specifically, the first angle sensor 15 is a rotary sensor.

[0104] Further, the current real-time height position of the first lead screw 41 can be calculated according to the relative rotation position of the first motor 3 provided by the first angle sensor 15, and the second upper stop position and the second lower stop position of the first lead screw 41 in the software level are set, the relative position relationship between the current height position of the first lead screw 41 and the second upper stop position and the second lower stop position set in the software is monitored in real time, and the current height position of the first lead screw 41 is prevented from exceeding the second upper stop position and the second lower stop position set in the software. The goal is to prevent or reduce the triggering of the first mechanical limit and the second mechanical limit during the short-time height adjustment process of the suspension device by the first motor 3.

[0105] According to the embodiment of the present application, in another aspect, a vehicle is also provided, which comprises the above-mentioned suspension device.

[0106] While embodiments of the present application have been described in conjunction with the appended drawings, various modifications and changes are possible within the spirit and scope of the present application, and such modifications and changes are intended to fall within the scope of the appended claims.

Claims

1. A suspension device, characterized by, It comprises a first lifting lug (1) and a second lifting lug (2); it also comprises: A first motor (3) comprising a first rotor (31) and a first stator (32); the first stator (32) is connected with the first lifting lug (1); A first transmission structure (4) comprising a first lead screw (41) and a first nut assembly (42), the first nut assembly (42) is fixedly connected with the first rotor (31), one end of the first lead screw (41) is in transmission cooperation with the first nut assembly (42); the other end of the first lead screw (41) is connected with the second lifting lug (2); A second motor (5) comprising a second rotor (51) and a second stator (52); the second stator (52) is connected with the first lifting lug (1), and the second rotor (51) is sleeved on the outer periphery of the second stator (52); A second transmission structure (6) comprising a second lead screw (61) and a second nut assembly (62), the second lead screw (61) is fixedly connected with the second rotor (51), the second nut assembly (62) has transmission cooperation state and self-locking state with the second lead screw (61), in the transmission cooperation state, the second lead screw (61) rotates under the drive of the second rotor (51) and drives the second nut assembly (62) to move in the axial direction; in the self-locking state, when the second nut assembly (62) is stressed in the axial direction, the second lead screw (61) is relatively fixed with the second nut assembly (62), and the second lead screw (61) is fixedly sleeved on the outer periphery of the second rotor (51); An elastic member (7) connected between the second lifting lug (2) and the second nut assembly (62); One end of the first lead screw (41) away from the first lifting lug (1) is connected with the second lifting lug (2) after sliding through the second stator (52); the second motor (5) further comprises: a support cylinder (53) comprising a cylinder body (531) and a second flange (532), the cylinder body (531) is sleeved on the outer periphery of the first lead screw (41) and fixedly penetrates the inner periphery of the second stator (52), the second flange (532) is protrusively arranged on the outer periphery of one end of the cylinder body (531), the second flange (532) covers one end of the first motor (3) and is detachably connected with the first motor (3).

2. The suspension device according to claim 1, characterized in that One end of the first stator (32) is fixedly connected with the second stator (52), and the other end is connected with the first lifting lug (1).

3. The suspension device according to claim 2, characterized in that The second nut assembly (62) is sleeved on the outer periphery of the second lead screw (61), and the elastic member (7) is sleeved on the outer peripheries of the second lead screw (61) and the first lead screw (41).

4. The suspension device according to claim 3, characterized in that The second nut assembly (62) comprises a first flange (621) protruding at the outer periphery of the second nut assembly (62) and located at the end away from the second lug (2); the elastic member (7) is a coil spring, one end of which is sleeved at the outer periphery of the second nut assembly (62) and abuts against the first flange (621); And / or, the second nut assembly (62) further comprises a planetary roller nut (622) sleeved at the outer periphery of the second lead screw (61), and the friction angle of the planetary roller nut (622) is greater than the thread inclination angle of the second lead screw (61).

5. The suspension device according to claim 3, characterized in that The second motor (5) further comprises: A first bearing (54) arranged between the cylinder (531) and the second rotor (51) for supporting the second rotor (51).

6. The suspension device according to claim 5, characterized in that Further comprising a first cover (8) and a sealing member (9), the first cover (8) is provided with a through hole, the first cover (8) is fixedly connected to the end of the cylinder (531) away from the second flange (532), and covers the cylinder (531), the second stator (52), the second rotor (51) and the second lead screw (61); the sealing member (9) is arranged at the inner periphery of the end of the cylinder (531) away from the second flange (532), the first lead screw (41) is slidably arranged in the through hole and in sliding sealing cooperation with the sealing member (9).

7. The suspension device according to claim 6, characterized in that The suspension device further comprises a buffer pad (10), the first lead screw (41) comprises a smooth section (411) and a threaded section (412), the threaded section (412) is in transmission cooperation with the first nut assembly (42); a limiting protrusion (413) is arranged between the threaded section (412) and the smooth section (411); the buffer pad (10) is sleeved at the outer periphery of the smooth section (411), one end of which abuts against the limiting protrusion (413), and the other end is adapted to be limited by the sealing member (9) and the first cover (8); And / or, the suspension device further comprises a second angle sensor (11) arranged between the second motor (5) and the first cover (8) for detecting the relative rotation speed between the second rotor (51) and the second stator (52); And / or, the suspension device further comprises a shock pad (12) sleeved at the outer periphery of the first lead screw (41) and located between the second lug (2) and the first cover (8).

8. The suspension device of claim 2, wherein The second lifting lug (2) comprises a support (21), a dust cover (22), a third flange (23) and a lifting lug body (24); one end of the first lead screw (41) away from the first lifting lug (1) is detachably connected to the inner periphery of the support (21), and the dust cover (22) is connected to one end of the support (21) away from the first lifting lug (1); the third flange (23) is fixedly sleeved on the outer periphery of the support (21) and located at one end close to the first lifting lug (1), and the elastic member (7) is connected between the third flange (23) and the second nut assembly (62); the lifting lug body (24) is protrusively arranged on the outer periphery of the support (21).

9. The suspension arrangement according to any one of claims 5 to 7, characterized in that The first motor (3) further comprises a housing (33) and a second bearing (34), the housing (33) is detachably connected with the second flange (532); the first stator (32) is fixedly connected inside the housing (33) and sleeved on the outer periphery of the first rotor (31); the first nut assembly (42) is sleeved on the outer periphery of the first lead screw (41), fixedly connected to the inner periphery of the first rotor (31) and rotatably connected with the housing (33) through the second bearing (34).

10. The suspension device of claim 9, wherein Further comprising a second cover body (13) and a limiting nut (14), the second cover body (13) is detachably connected to one end of the housing (33) away from the second motor (5), the middle position of the second cover body (13) is provided with an extension section (131) protruding away from the second motor (5), the extension section (131) is provided with an extension cavity in communication with the inner periphery of the first nut assembly (42), and the first lifting lug (1) is connected to one end of the extension section (131) away from the housing (33); the limiting nut (14) is fixedly connected to the outer periphery of the first nut assembly (42) and located at one end close to the second cover body (13) for limiting the first nut assembly (42).

11. The suspension device of claim 10, wherein Further comprising a first angle sensor (15) arranged between the second cover body (13) and the housing (33) for detecting the relative rotation speed between the first nut assembly (42) and the housing (33).

12. A vehicle characterized by comprising: The suspension device comprises the suspension device according to any one of claims 1 to 11.

Images