Driving motor vibration isolation device and control strategy

Abstract

The invention provides a driving motor vibration isolation device and a control strategy. The driving motor vibration isolation device comprises an upper liquid chamber and a lower liquid chamber which are arranged on a vehicle body and located below a driving motor, and a supporting partition plate for separating the upper liquid chamber from the lower liquid chamber is arranged between the upper liquid chamber and the lower liquid chamber; the device is characterized in that at least one adjusting valve communicated with the upper liquid chamber and the lower liquid chamber is arranged on the supporting partition plate; the adjusting valve comprises at least two channels with different cross section areas, and a valve body of the adjusting valve is driven by a valve driving mechanism so that the adjusting valve can be switched to different channels. And the valve driving mechanism and the driving motor are electrically connected with the controller. The problem of low-frequency vibration isolation of a drive motor suspension system is effectively solved, the requirements for supporting and vibration amplitude suppression of the motor under the large torque force are considered, the vibration isolation performance of the motor under various working conditions is met, and meanwhile the reliability is obviously superior to that of a current rubber suspension.

Description

Technical Field

[0001] The present invention belongs to the field of new energy vehicles, and specifically relates to a drive motor vibration isolation device and a control strategy. Background Art

[0002] The drive motor vibration isolation structure is an important component of the new energy bus power system. Currently, the existing new energy bus drive motors mostly use cylindrical or square rubber vibration isolation. The vibration isolation concept follows the traditional diesel engine vibration isolation design structure. The rubber vibration isolation pad basically also uses the traditional power vibration isolation structure and stiffness. However, this rubber vibration isolation structure has the following disadvantages for the pure electric drive system: 1. The low-frequency excitation vibration of the motor rotor and the drive shaft cannot be isolated, causing the rotational vibration of the motor and the drive shaft to be transmitted to the vehicle body, affecting the riding experience. The drive motor body is light in weight. Compared with the 1-ton-1.5-ton diesel powertrain, the drive motor mass is only 100Kg-400Kg, which leads to a very high natural modal frequency of the drive motor system. The natural frequency is the resonant frequency of the system. When the external excitation frequency approaches or reaches the natural frequency of the system, the system vibration reaches its maximum, which is also called resonance. As the excitation frequency continues to increase, the system vibration at the natural frequency will continue to decrease until the excitation frequency is greater than 2^0.5 times the natural frequency, the amplitude of the excitation vibration will decay, and as the excitation frequency continues to increase, the attenuation amplitude will be greater. For the same rubber vibration isolation element, the natural modal frequency of the powertrain composed of the diesel engine is basically within 13Hz, so that excitations above 18Hz can be attenuated by rubber vibration isolation pads, and the natural modal frequency formed by the drive motor can reach 30Hz, so that excitations above 42Hz can achieve vibration reduction, and the rotational excitation frequency of the motor and the drive shaft is between 25Hz-55Hz, which results in the rotational dynamic unbalance excitation of the motor rotor and the drive shaft cannot be isolated by rubber pads, causing vibration problems during high-speed driving of the vehicle.

[0003] 2. The suspension rubber pads are easy to tear and have poor reliability: The maximum torque of the traditional powertrain kingpin engine is 1600N.mm, while the maximum peak torque of the drive motor matching the same type of bus products reaches 3000N.mm. The same rubber vibration isolation pads are easy to tear under the action of large torque. Rubber can withstand pressure, but it is poor at withstanding tension. Under the action of large torque, the drive motor must be compressed on one side and pulled on the other side. The rubber on the side under tension is very easy to tear. The reliability is much worse than that of traditional vehicles.

[0004] 3. The stiffness of rubber mounts is generally too large and cannot be significantly reduced to meet the vibration isolation requirements of drive motors: Due to the easy aging and tearing of rubber mounts, the stiffness of rubber mounts cannot be made very low during the development of structures. Currently, the stiffness of rubber mounts for drive motors of new energy buses and commercial vehicles is basically in the range of 1000N / m-2000N / mm, and cannot be 300N / mm or below. For drive motors, to reduce the natural modal frequency to within 13Hz, the stiffness of the rubber mount must be <300N / mm, which is obviously impossible to achieve. That is, the current stiffness limit of rubber mounts can no longer meet the vibration isolation requirements of drive motors.

[0005] 4. The stiffness and damping force of the rubber suspension are single, and it cannot provide stiffness support under various working conditions. When the drive motor is in full throttle acceleration condition, due to the large torque force, the suspension rubber pad needs to provide high stiffness and damping to limit the torsional displacement and vibration amplitude of the motor; when the drive motor is running with small torque (driving at a constant speed or sliding), the suspension needs to provide small stiffness and damping to achieve maximum vibration isolation. The current suspension rubber pad cannot meet this demand.

[0006] Patent CN108488306A discloses an adaptive multi-inertia channel hydraulic mount and its adaptive method. However, this structure is applied under the engine and can only passively adapt to the environment and respond to changes in external pressure; but it cannot actively reduce vibration or reduce the amplitude of vibration. Summary of the invention

[0007] The invention provides a driving motor vibration isolation device and a control strategy.

[0008] The objective of the present invention is achieved in the following manner: a drive motor vibration isolation device comprises an upper liquid chamber and a lower liquid chamber which are arranged on a vehicle body and located below the drive motor, a support partition is arranged between the upper liquid chamber and the lower liquid chamber to separate the two; at least one regulating valve connecting the upper liquid chamber and the lower liquid chamber is arranged on the support partition; the regulating valve comprises at least two channels with different cross-sectional areas, the valve of the regulating valve is driven by a valve driving mechanism to switch the regulating valve to different channels; the valve driving mechanism and the drive motor are electrically connected to a controller.

[0009] The supporting baffle is provided with through holes, and the regulating valve is fixedly arranged in at least one of the through holes; the regulating valve includes an inlet channel connected to the upper liquid chamber and at least two outlet channels with different cross-sectional areas connected to the lower liquid chamber; the valve is rotatably arranged inside the regulating valve so that the inlet channel is connected or disconnected with different outlet channels, and the valve driving mechanism includes a valve motor arranged on the regulating valve housing; the output shaft of the valve motor passes through the housing of the regulating valve and is fixedly connected to the valve; all the valve motors are electrically connected to the same controller arranged outside the upper liquid chamber and the lower liquid chamber; a motor circuit channel leading to the outside is arranged in the supporting baffle, and a sealing mechanism is arranged at the end of the motor circuit channel.

[0010] The regulating valve is provided with two outlet channels: a large outlet channel and a small outlet channel; a spherical hole is provided at the intersection of the inlet channel, the large outlet channel and the small outlet channel in the regulating valve, and the valve includes a partial spherical surface corresponding to the spherical hole; a sealing mechanism is provided at the position where the valve motor contacts the housing of the regulating valve.

[0011] The support baffle is provided with a plurality of through holes evenly distributed along the circumference, and a regulating valve is fixed in each through hole; the controller electrically connected to the valve motor is a valve motor controller fixedly arranged on the circumferential side of the support baffle; the valve motor controller is electrically connected to the vehicle controller, and the controller electrically connected to the drive motor is the vehicle controller.

[0012] The outer walls of the upper liquid chamber and the lower liquid chamber are elastic, the lower end of the upper liquid chamber is fixed to the upper end of the supporting partition, and the upper end of the lower liquid chamber is fixed to the lower end of the supporting partition; the lower end of the supporting partition is fixedly provided with a lower bracket connected to the vehicle body; the lower liquid chamber is located inside the lower bracket; the upper end of the upper liquid chamber is fixedly provided with an upper bracket.

[0013] A spring assembly is arranged in the upper liquid chamber in the up and down directions, and the spring assembly includes at least two springs with different lengths; during the downward movement of the upper bracket from the initial position, the springs with different lengths begin to be compressed in sequence from long to short.

[0014] The upper liquid chamber is surrounded by an upper elastic diaphragm and the supporting baffle, and the lower liquid chamber is surrounded by a lower elastic diaphragm and the supporting baffle; the upper bracket includes a mounting boss, a fixing boss, a bracket sealing cylinder, and a bracket shell; wherein the bracket shell is arranged on the upper surface of the upper elastic diaphragm, and a hollow cylindrical bracket sealing cylinder located in the upper liquid chamber is arranged downwardly in the middle position of the bracket shell, and the mounting boss for connecting the driving motor is arranged upwardly in the middle position of the bracket shell, and the fixing boss for installing the upper end of the spring assembly is arranged downwardly, and the fixing boss is located inside the bracket sealing cylinder; a hollow cylindrical partition sealing cylinder is arranged upwardly at a position in the middle of the support baffle corresponding to the bracket sealing cylinder, and the bracket sealing cylinder and the partition sealing cylinder are slidably connected and sealed by a sealing structure; the spring assembly is arranged in a space surrounded by the bracket sealing cylinder and the partition sealing cylinder, the supporting baffle, and the fixing boss.

[0015] The spring assembly includes at least two springs of different lengths and stiffnesses; the larger the spring stiffness, the smaller the length; the upper end of the longest spring is fixed on the fixed boss, and the lower end is arranged on the supporting partition inside the partition sealing tube; the lower ends of the remaining springs smaller than the longest spring are arranged on the supporting partition inside the partition sealing tube.

[0016] The controller reads the output torque value of the driving motor and determines the output size of the torque force; for peak torque, the controller controls all regulating valves to open the channel with the smallest cross-sectional area; for large torque output, some regulating valves open the channel with the largest cross-sectional area, and some regulating valves open the channel with the smallest cross-sectional area; for small torque output, all regulating valves open the channel with the largest cross-sectional area.

[0017] Eight regulating valves are arranged on the support baffle, and each regulating valve includes an inlet channel and two outlet channels: a large outlet channel and a small outlet channel; the controller reads the output torque value of the drive motor and determines the output size of the torque force; for the output of peak torque: at this time, the whole vehicle is accelerating at low speed and full throttle, and the amplitude of the torsional vibration of the drive motor needs to be suppressed. The valve controller controls the valves of the eight regulating valves in the support baffle to close the large outlet and open the small outlet channel. At this time, the fluid flow rate is the largest, the damping force is the largest, and the maximum dissipative damping force can be provided for the drive motor, thereby suppressing the vibration amplitude of the motor to the maximum extent; for large torque output: at this time, the whole vehicle is accelerating at a small throttle, and after providing a certain degree of suppression In order to control the vibration amplitude of the drive motor, good vibration isolation performance needs to be provided. Half of the valves in the eight channels in the support baffle close the large outlet channel and open the small outlet channel. The other half of the valves close the small outlet channel and open the large outlet channel. At this time, the fluid flow rate is medium and the damping force is medium. The fluid damping and the spring assembly jointly isolate vibrations, providing better vibration isolation performance while suppressing the vibration amplitude of the dissipated motor. For small torque output: At this time, the whole vehicle is running or gliding at a uniform speed, and the best vibration isolation performance needs to be provided. All the valves in the eight channels in the support baffle close the small outlet channel and open the large outlet channel. At this time, the fluid flow rate is the smallest, the damping force is the smallest, and the spring assembly plays the main vibration isolation component to achieve optimal vibration isolation of the motor.

[0018] Beneficial effects: Compared with the existing technology, the invention patent effectively solves the low-frequency vibration isolation problem of the drive motor suspension system, and takes into account the needs of support and vibration amplitude suppression under large torque force of the motor, meeting the vibration isolation performance of the motor under various working conditions. At the same time, the reliability performance is significantly better than the current rubber suspension. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the vibration isolation device of the present invention.

[0020] Figure 2 It is an upper support structure.

[0021] Figure 3 It is the lower support structure.

[0022] Figure 4 It supports the partition structure and the motor circuit channel.

[0023] Figure 5 It is the distribution of regulating valves and the direction of valve motor lines.

[0024] Figure 6 It is a schematic diagram of the opening of the small outlet channel of the regulating valve.

[0025] Figure 7 It is the regulating valve structure and the valve motor structure.

[0026] Figure 8yes Figure 7 AA direction cross-sectional view.

[0027] Fig. 9 This is the vibration isolation effect of the structural suspension of the present invention when a large torque is output (accelerated driving).

[0028] Fig.10 This is the vibration isolation effect of the structural suspension of the present invention when the torque output is small (driving at a constant speed).

[0029] Fig.11 It is the effect of suppressing the vibration amplitude of the drive motor when the peak torque is output.

[0030] Fig.12 It is a schematic diagram of the opening of the large outlet channel of the regulating valve.

[0031] The names of the components corresponding to the corresponding figure marks in the figure are: upper elastic diaphragm 1, upper bracket 2, spring assembly 3, sealing ring 4, upper liquid chamber 5, regulating valve 6, supporting partition 7, lower liquid chamber 8, lower bracket 9, lower elastic diaphragm 10, bracket shell 21, mounting boss 22, fixing boss 23, bracket sealing cylinder 24, inlet channel 61, large outlet channel 62, small outlet channel 63, valve 64, valve motor 65, partition sealing cylinder 71, valve motor controller 72, motor circuit 75, motor circuit channel 76, lower boss 91, bracket shell 92, bolt hole 93, output shaft 650. DETAILED DESCRIPTION

[0032] In the present invention, unless otherwise clearly specified and limited, the technical terms used in this application shall be the common meanings understood by the technicians of the present invention. The terms "connected", "connected", "fixed", "set", etc. should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be directly connected, or indirectly connected through an intermediate medium; may be mechanically connected or electrically connected. Unless otherwise clearly specified and limited, the first feature "on" or "below" the second feature may be that the first and second features are in direct contact, or indirectly in contact through an intermediate medium. Moreover, the first feature "above" or "above" or "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below" or "below" or "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Relational terms such as first, second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms used in the description, such as "center", "lateral", "longitudinal", "length", "width", "thickness", "height", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "clockwise", "counterclockwise", etc., to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0033] The following will provide a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings and specific embodiments. Figure 1-12As shown, a drive motor vibration isolation device includes an upper liquid chamber 5 and a lower liquid chamber 8 arranged on a vehicle body and located below the drive motor, and a support partition 7 is arranged between the upper liquid chamber 5 and the lower liquid chamber 8 to separate the two; at least one regulating valve 6 connecting the upper liquid chamber 5 and the lower liquid chamber 8 is arranged on the support partition 7; the regulating valve 6 includes at least two channels with different cross-sectional areas, and the valve 64 of the regulating valve 6 is driven by the valve 64 driving mechanism to switch the regulating valve 6 to different channels; the valve 64 driving mechanism and the drive motor are both electrically connected to the controller. The regulating valve 6 here can be an electric regulating valve 6, a pneumatic regulating valve 6, etc., and the channel opening, closing and channel switching are realized by the valve 64 driving mechanism. The valve 64 driving mechanism and the drive motor are connected to the controller, and the controller here can be a vehicle controller or other controllers. The controller automatically reads the output torque of the vehicle-mounted drive motor and realizes the active control of the regulating valve 6 through different torque conditions. Of course, the controller can also control the regulating valve 6 through other parameters to switch different channels. When the driving motor vibrates, the fluid in the upper liquid chamber 5 flows into the lower liquid chamber 8 through the channel in the regulating valve 6, and the regulating valve 6 is switched to channels with different cross-sectional areas; different damping forces are generated according to the flow velocity during the fluid flow process, and the damping force acts on the supporting partition 7 to dissipate the vibration energy of the supporting partition 7. The attenuated vibration is transmitted to the vehicle body, realizing the vibration isolation and energy dissipation of the motor vibration.

[0034] Further, the support partition 7 is provided with a through hole, and the regulating valve 6 is fixedly arranged in at least one of the through holes; the regulating valve 6 includes an inlet channel 61 connected to the upper liquid chamber 5 and at least two outlet channels with different cross-sectional areas connected to the lower liquid chamber 8; the valve 64 is rotatably arranged inside the regulating valve 6 so that the inlet channel 61 is connected or disconnected with different outlet channels, and the valve 64 driving mechanism includes a valve motor 65 arranged on the housing of the regulating valve 6; the output shaft 650 of the valve motor 65 passes through the housing of the regulating valve 6 and is fixedly connected to the valve 64; all the valve motors 65 are electrically connected to the same controller arranged outside the upper liquid chamber 5 and the lower liquid chamber 8; the support partition 7 is provided with a motor line channel 76 leading to the outside, and a sealing mechanism is provided at the end of the motor line channel 76. The valve motor 65 here can be a motor dedicated to the valve 64, or a commonly used motor, such as a servo motor. The valve motor 65 and the housing of the regulating valve 6 can be fixed by small screw connection, welding, bonding, etc. The through hole and the regulating valve 6 can be fixedly connected by interference fit or the like. The controller is preferably arranged outside the vibration isolation device, for example, fixedly arranged on the circumferential side of the support baffle 7 by means of screws or the like, and can of course be arranged elsewhere. The shape of the motor circuit channel 76 is preferably an inverted L-shape, and the end is arranged on the circumferential side of the support baffle 7, so as to lead to the side of the vibration isolation device. There can be one motor circuit channel 76 on the support baffle 7, or there can be multiple motor circuit channels 76. A motor circuit channel 76 can be arranged for the motor circuit 75 of each motor, or a motor circuit channel 76 can be shared by the motor circuits 75 of multiple motors. Preferably, the circuits of all valve motors 65 share the same motor circuit channel 76, as shown in the accompanying drawings. The sealing mechanism at the end of the motor circuit channel 76 can be a sealing ring 4. The sealing ring 4 can be arranged in a sealing groove at the end of the motor circuit channel 76. The sealing mechanism can also be a sealing rubber strip arranged on the support baffle 7 at the end of the motor circuit channel 76, which is pressed from the outside by a pressure strip.

[0035] Furthermore, two outlet channels are arranged on the regulating valve 6: a large outlet channel 62 and a small outlet channel 63; a spherical hole is arranged at the intersection of the inlet channel 61, the large outlet channel 62 and the small outlet channel 63 in the regulating valve 6, and the valve 64 includes a partial spherical surface corresponding to the spherical hole; a sealing mechanism is arranged at the position where the valve motor 65 contacts the shell of the regulating valve 6. The spherical hole is a transfer station for the fluid channels of the upper and lower liquid chambers 8. The valve 64 includes a partial spherical surface, but not a complete spherical surface. The area or angle corresponding to the spherical surface of the valve 64 is determined according to needs. The valve 64 can be optionally arranged as a hollow hemispherical structure with a diameter slightly smaller than the diameter of the spherical hole, so as to achieve shape fitting, as shown in the structure in the accompanying drawings. The valve 64 is connected to the valve motor 65 through a micro-connecting shaft. The valve motor 65 can drive the hemispherical valve 64 to rotate 180 degrees each time. Each rotation can realize the closing and opening of the large outlet channel 62 and the small outlet channel 63. The valve motor 65 is fixed on the housing of the regulating valve 6. The circuit of the valve motor 65 is connected to the controller and the circuit plug through the motor circuit channel 76 on the supporting partition 7 to realize the transmission of power and signals. The rotation angle of the valve motor 65 is controlled by the controller according to the size of the torque force of the driving motor to realize the opening and closing of the large outlet channel 62 and the small outlet channel 63, thereby changing the flow speed of the liquid in the upper liquid chamber 5 to the lower liquid chamber 8. Different liquid flow speeds can provide different fluid damping forces. The positions of the large outlet channel 62 and the small outlet channel 63 in the accompanying drawings and the shape of the valve 64 can realize the conversion of the large outlet channel 62 and the small outlet channel 63. In fact, the relative positions between the inlet channel 61, the large outlet channel 62, and the small outlet channel 63 can be set as needed. After turning the valve 64, the inlet channel 61 and the large outlet channel 62 can be connected, the inlet channel 61 and the small outlet channel 63 can be connected, the inlet channel 61 and the large outlet channel 62 and the small outlet channel 63 can be connected, or none of them can be connected. For embodiments with more than two outlet channels, the above structure can also be adopted, that is, the structure of the spherical hole and the partial spherical valve 64. In addition, the shape of the inlet channel 61, the large outlet channel 62, and the small outlet channel 63 at the intersection in the regulating valve 6 can be other shapes, such as cylindrical, etc., and the corresponding shape of the valve 64 can be changed accordingly. In addition, the sealing mechanism set between the contact position of the valve motor 65 and the housing of the regulating valve 6 can be a sealing rubber strip, which is used to seal the hole where the output shaft of the valve motor 65 is located.

[0036] Furthermore, the support baffle 7 is provided with a plurality of through holes evenly distributed along the circumference, and a regulating valve 6 is fixed in each through hole; the controller electrically connected to the valve motor 65 is a valve motor controller 72 fixedly arranged on the circumferential side of the support baffle 7; the valve motor controller 72 is electrically connected to the vehicle controller, and the controller electrically connected to the drive motor is the vehicle controller. The vehicle controller automatically reads the output torque of the vehicle drive motor. The valve motor controller 72 controls the regulating valve 6, and controls the opening and closing of each channel according to the magnitude of the motor output torque, so as to control the flow rate of the fluid and output different damping forces. In the accompanying drawings, the support baffle 7 is provided with 8 through holes, and the 8 regulating valves 6 are used to improve the overall damping performance of the liquid. The valve motor controller 72 can independently control the valve motors 65 of each adaptive regulating valve 6 to achieve the coordinated operation of each regulating valve 6. Of course, the number of regulating valves 6 can also be set to other numbers as needed.

[0037] Specifically, the outer walls of the upper liquid chamber 5 and the lower liquid chamber 8 are elastic, the lower end of the upper liquid chamber 5 is fixed to the upper end of the supporting baffle 7, and the upper end of the lower liquid chamber 8 is fixed to the lower end of the supporting baffle 7; the lower end of the supporting baffle 7 is fixedly provided with a lower bracket 9 connected to the vehicle body; the lower liquid chamber 8 is located inside the lower bracket 9; the upper end of the upper liquid chamber 5 is fixedly provided with an upper bracket 2. The driving motor is arranged above the upper bracket 2, and the vibration at the motor end is transmitted to the upper bracket 2, and the attenuated vibration is transmitted to the lower bracket 9 through the vibration reduction device. Both the upper liquid chamber 5 and the lower liquid chamber 8 are elastic structures, and the liquids therein can flow to each other as the volume changes. These are existing structures and will not be described in detail.

[0038] Furthermore, a spring assembly 3 is arranged in the upper liquid chamber 5 in the up and down directions, and the spring assembly 3 includes at least two springs of different lengths; during the downward movement of the upper bracket 2 from the initial position, the springs of different lengths begin to be compressed in sequence from long to short. In the present invention, a spring assembly 3 is arranged in the upper liquid chamber 5, and a plurality of springs of different lengths form a parallel structure. In the initial state, only one end of the two ends of some springs is fixed. When the upper bracket 2 just starts to move downward, generally only one spring is compressed to provide a damping force, and at this time the stiffness of the spring assembly 3 is relatively small. During the downward movement of the upper bracket 2, the two ends of the springs of different lengths begin to contact the upper and lower ends of the upper liquid chamber 5 and are compressed, and the stiffness of the spring providing the damping force gradually increases. The patent of this invention adopts multi-stage parallel springs as the main vibration isolation components and fluid damping as the auxiliary vibration isolation components. It judges the operating conditions of the whole vehicle by reading the torque force output by the drive motor, and adaptively adjusts the damping performance according to different working conditions, so that the vibration isolation device provides large damping and large stiffness when the motor has large torque force, supports the motor vibration isolation and limits the vibration amplitude of the motor; and ensures that the vibration isolation device provides small damping and small stiffness when the motor has small torque force, reduces the natural frequency of the drive motor vibration isolation system, and improves the low-frequency vibration isolation effect. The invention adopts a multi-stage spring structure to solve the problem that the rubber structure cannot withstand tension. The reliability is much higher than the rubber vibration isolation on the market. At the same time, the stiffness of the multi-section spring structure can be within 300N / mm, meeting the small stiffness requirements.

[0039] The upper liquid chamber 5 is surrounded by the upper elastic diaphragm 1 and the supporting baffle 7, and the lower liquid chamber 8 is surrounded by the lower elastic diaphragm 10 and the supporting baffle 7; the upper bracket 2 includes a mounting boss 22, a fixing boss 23, a bracket sealing cylinder 24, and a bracket shell 9221; wherein the bracket shell 9221 is arranged on the upper surface of the upper elastic diaphragm 1, the bracket sealing cylinder 24 in the shape of a hollow cylinder located in the upper liquid chamber 5 is arranged downward in the middle position of the bracket shell 9221, and the bracket shell 9221 is arranged upward in the middle position for connecting the drive motor The mounting boss 22 is downwardly provided with the fixed boss 23 for mounting the upper end of the spring assembly 3, and the fixed boss 23 is located inside the bracket sealing cylinder 24; the middle of the support partition 7 is upwardly provided with a hollow cylinder-shaped partition sealing cylinder 71 corresponding to the position of the support sealing cylinder 24, and the support sealing cylinder 24 and the partition sealing cylinder 71 are slidably connected and sealed by a sealing structure; the spring assembly 3 is arranged in the space surrounded by the support sealing cylinder 24 and the partition sealing cylinder 71, the support partition 7, and the fixed boss 23. The middle position here includes but is not limited to the most central position. Multiple groups of spring assemblies 3 with similar sealing structures can be arranged in the upper liquid chamber 5. These are all within the protection scope of the present invention. The support sealing cylinder 24 and the partition sealing cylinder 71 can be sealed by a sealing ring 4 to achieve sliding sealing. The support sealing cylinder 24 and the partition sealing cylinder 71 and the sealing ring 4 isolate the liquid in the upper liquid chamber 5 from the spring assembly 3 to avoid liquid corrosion of the spring assembly 3. The drive motor is mounted on the mounting boss 22 of the upper bracket 2.

[0040] The spring assembly 3 includes at least two springs of different lengths and different stiffnesses; the greater the spring stiffness, the smaller the length; the upper end of the longest spring is fixed on the fixed boss 23, and the lower end is arranged on the support partition 7 in the partition sealing cylinder 71; the lower ends of the remaining springs smaller than the longest spring are arranged on the support partition 7 in the partition sealing cylinder 71. In the present invention, the spring with small stiffness is long, and the spring with large stiffness is short. The spring vibration isolation component is composed of spring assemblies 3 of different stiffness in parallel, and the spring lengths are different. The spring with small stiffness is long, and the spring with large stiffness is short. This structure can ensure that the motor contacts the small stiffness spring first under the condition of small torque force, and the small stiffness spring provides support force. As the motor torque increases, the small stiffness spring is continuously compressed until it contacts the large stiffness spring. At this time, there are at least two large and small springs in parallel to provide support stiffness. The spring vibration isolation component can be set with springs of different stiffness according to needs, and the lengths decrease successively to ensure that the spring vibration isolation component can provide more than two vibration reduction stiffnesses. Furthermore, the upper elastic diaphragm 1 and the lower elastic diaphragm 10 are diaphragms made of rubber, the upper elastic diaphragm 1, the supporting partition 7, and the lower bracket 9 are connected by bolts, the upper end surface and the upper part of the side of the upper elastic module are fixedly provided with the upper bracket 2 by vulcanization; the middle position of the lower bracket 9 is fixedly provided with a lower boss 91; the lower end of the lower boss 91 passes through the lower bracket 9. The lower boss 91 can be fixedly connected to the vehicle body. The lower bracket 9 is provided with a bolt hole 93.

[0041] The controller reads the output torque value of the driving motor and determines the output size of the torque force; for peak torque, the controller controls all regulating valves 6 to open the channel with the smallest cross-sectional area; for large torque output, some regulating valves 6 open the channel with the largest cross-sectional area, and some regulating valves 6 open the channel with the smallest cross-sectional area; for small torque output, all regulating valves 6 open the channel with the largest cross-sectional area.

[0042] Eight regulating valves 6 are arranged on the supporting baffle 7, and each regulating valve 6 includes an inlet channel 61 and two outlet channels: a large outlet channel 62 and a small outlet channel 63; the controller reads the output torque value of the driving motor and determines the output size of the torque force; for the output of peak torque: at this time, the whole vehicle is accelerating at full throttle at low speed, and the amplitude of the torsional vibration of the driving motor needs to be suppressed. The valve 64 controller controls the valves 64 of the eight regulating valves 6 in the supporting baffle 7 to close the large outlet and open the small outlet channel 63. At this time, the fluid flow rate is the largest, the damping force is the largest, and the maximum dissipative damping force can be provided for the driving motor, thereby maximally suppressing the vibration amplitude of the motor; for large torque output: at this time, the whole vehicle is in the process of accelerating at a small throttle, and a certain degree of suppression of the driving motor is provided. While increasing the vibration amplitude of the motor, it is necessary to provide good vibration isolation performance. Half of the valves 64 in the eight channels of the support baffle 7 close the large outlet channel 62 and open the small outlet channel 63. The other half of the valves 64 close the small outlet channel 63 and open the large outlet channel 62. At this time, the fluid flow rate is medium and the damping force is medium. The fluid damping and the spring assembly 3 are used together to isolate vibrations, and provide better vibration isolation performance while suppressing the vibration amplitude of the dissipated motor. For small torque output: At this time, the whole vehicle is running at a uniform speed or gliding, and the best vibration isolation performance needs to be provided. All the valves 64 in the eight channels of the support baffle 7 close the small outlet channel 63 and open the large outlet channel 62. At this time, the fluid flow rate is the smallest, the damping force is the smallest, and the spring assembly 3 plays the main vibration isolation component to achieve the optimal vibration isolation of the motor. Specifically, the test results at peak torque are as follows: Fig.11 The test results of the large torque output chamber are shown in Fig. 9 The small torque output test results are shown in Fig.10 shown.

[0043] In specific implementation: when the drive motor runs at peak torque, the upper bracket 2 compresses the spring assembly 3 to the position of large stiffness. At this time, multiple springs are supported in parallel. At the same time, the upper bracket 2 compresses the fluid in the upper liquid chamber 5 to start flowing to the lower liquid chamber 8. The regulating valve 6 opens the channel with a small channel diameter and closes the channel with a large diameter by adjusting the opening of the valve 64. At this time, the fluid flow rate is the largest and the damping force generated is also the largest. The large stiffness spring and large damping provide a large support force for the motor and dissipate the vibration capacity to the greatest extent, thereby suppressing the vibration amplitude of the motor. When the motor runs at a small torque, the upper bracket 2 compresses the spring assembly 3 to the position of small stiffness. At this time, the longest spring contacts and the stiffness is the smallest. At the same time, the upper bracket 2 compresses the fluid in the upper liquid chamber 5 to flow to the lower liquid chamber 8. The adaptive regulating valve 6 adjusts the opening of the valve 64 to open the channel with a large diameter and close the channel with a small diameter. At this time, the flow rate of the fluid is the smallest and the damping force generated is also the smallest. The small stiffness spring and small damping reduce the natural frequency of the motor suspension system, thereby achieving good vibration isolation performance of the motor at low frequency. This invention effectively solves the low-frequency vibration isolation problem of the drive motor suspension system, and takes into account the needs of support and vibration amplitude suppression under large torque forces of the motor, meeting the vibration isolation performance of the motor under various working conditions. At the same time, the reliability performance is significantly better than the current rubber suspension.

[0044] The technical features of the above-mentioned embodiments can be combined arbitrarily, and as long as there is no contradiction in the combination of these technical features, they should be considered as the scope of this specification. Without departing from the overall concept of the present invention, the technical solution of the present invention and the equivalent replacement or change, as well as the changes and improvements made, should also be regarded as the protection scope of the present invention.

Claims

1. A drive motor vibration isolation device, comprising an upper liquid chamber and a lower liquid chamber arranged on a vehicle body and located below the drive motor, wherein a support partition is arranged between the upper liquid chamber and the lower liquid chamber to separate the two; characterized in that: At least one regulating valve connecting the upper liquid chamber and the lower liquid chamber is arranged on the supporting partition; the regulating valve comprises at least two channels with different cross-sectional areas, and the valve of the regulating valve is driven by the valve driving mechanism to switch the regulating valve to different channels; the valve driving mechanism and the driving motor are both electrically connected to the controller.

2. A drive motor vibration isolation device according to claim 1, characterized in that: The supporting baffle is provided with through holes, and the regulating valve is fixedly arranged in at least one of the through holes; the regulating valve includes an inlet channel connected to the upper liquid chamber and at least two outlet channels with different cross-sectional areas connected to the lower liquid chamber; the valve is rotatably arranged inside the regulating valve so that the inlet channel is connected or disconnected with different outlet channels, and the valve driving mechanism includes a valve motor arranged on the regulating valve housing; the output shaft of the valve motor passes through the housing of the regulating valve and is fixedly connected to the valve; all the valve motors are electrically connected to the same controller arranged outside the upper liquid chamber and the lower liquid chamber; a motor circuit channel leading to the outside is arranged in the supporting baffle, and a sealing mechanism is arranged at the end of the motor circuit channel.

3. A drive motor vibration isolation device according to claim 2, characterized in that: The regulating valve is provided with two outlet channels: a large outlet channel and a small outlet channel; a spherical hole is provided at the intersection of the inlet channel, the large outlet channel and the small outlet channel in the regulating valve, and the valve includes a partial spherical surface corresponding to the spherical hole; a sealing mechanism is provided at the position where the valve motor contacts the housing of the regulating valve.

4. A drive motor vibration isolation device according to claim 2, characterized in that: The support baffle is provided with a plurality of through holes evenly distributed along the circumference, and a regulating valve is fixed in each through hole; the controller electrically connected to the valve motor is a valve motor controller fixedly arranged on the circumferential side of the support baffle; the valve motor controller is electrically connected to the vehicle controller, and the controller electrically connected to the drive motor is the vehicle controller.

5. A drive motor vibration isolation device according to any one of claims 1 to 4, characterized in that: The outer walls of the upper liquid chamber and the lower liquid chamber are elastic, the lower end of the upper liquid chamber is fixed to the upper end of the supporting partition, and the upper end of the lower liquid chamber is fixed to the lower end of the supporting partition; the lower end of the supporting partition is fixedly provided with a lower bracket connected to the vehicle body; the lower liquid chamber is located inside the lower bracket; the upper end of the upper liquid chamber is fixedly provided with an upper bracket.

6. A drive motor vibration isolation device according to claim 5, characterized in that: A spring assembly is arranged in the upper liquid chamber in the up and down directions, and the spring assembly includes at least two springs with different lengths; during the downward movement of the upper bracket from the initial position, the springs with different lengths begin to be compressed in sequence from long to short.

7. A drive motor vibration isolation device according to claim 6, characterized in that: The upper liquid chamber is surrounded by the upper elastic diaphragm and the supporting baffle, and the lower liquid chamber is surrounded by the lower elastic diaphragm and the supporting baffle; the upper bracket includes a mounting boss, a fixing boss, a bracket sealing cylinder, and a bracket shell; The bracket shell is arranged on the upper surface of the upper elastic diaphragm, and a hollow cylindrical bracket sealing cylinder located in the upper liquid chamber is arranged downward from the middle position of the bracket shell; the mounting boss for connecting the drive motor is arranged upward from the middle position of the bracket shell, and the fixed boss for mounting the upper end of the spring assembly is arranged downward, and the fixed boss is located inside the bracket sealing cylinder; a hollow cylindrical partition sealing cylinder is arranged upward from the middle of the support partition at a position corresponding to the bracket sealing cylinder, and the bracket sealing cylinder and the partition sealing cylinder are slidably connected and sealed by a sealing structure; the spring assembly is arranged in a space surrounded by the bracket sealing cylinder and the partition sealing cylinder, the support partition, and the fixed boss.

8. A drive motor vibration isolation device according to claim 7, characterized in that: The spring assembly includes at least two springs of different lengths and stiffnesses; the larger the spring stiffness, the smaller the length; the upper end of the longest spring is fixed on the fixed boss, and the lower end is arranged on the supporting partition inside the partition sealing tube; the lower ends of the remaining springs smaller than the longest spring are arranged on the supporting partition inside the partition sealing tube.

9. A control strategy for a drive motor vibration isolation device according to any one of claims 1 to 8, characterized in that: The controller reads the output torque value of the driving motor to determine the output magnitude of the torque force; For peak torque, the controller controls all regulating valves to open the channel with the smallest cross-sectional area; for large torque output, some regulating valves open the channel with the largest cross-sectional area, and some regulating valves open the channel with the smallest cross-sectional area; For small torque output, all regulating valves open the channel with the largest cross-sectional area.

10. The control strategy of the adaptive vibration isolation device according to any one of claims 6 to 8 is characterized in that: Eight regulating valves are arranged on the supporting baffle, each regulating valve comprises an inlet channel and two outlet channels: a large outlet channel and a small outlet channel; The controller reads the output torque value of the driving motor to determine the output magnitude of the torque force; For the output of peak torque: at this time, the whole vehicle is accelerating at full throttle at low speed, and the amplitude of the torsional vibration of the drive motor needs to be suppressed. The valve controller controls the valves of the eight regulating valves in the support partition to close the large outlet and open the small outlet channel. At this time, the fluid flow rate is the largest, and the damping force is the largest, which can provide the maximum dissipative damping force for the drive motor, thereby suppressing the vibration amplitude of the motor to the greatest extent; for high torque output: at this time, the whole vehicle is accelerating at a small throttle. While providing a certain degree of suppression of the vibration amplitude of the drive motor, it is necessary to provide good vibration isolation performance. Half of the eight channels in the support partition are closed. The valve closes the large outlet channel and opens the small outlet channel. The other half of the valves close the small outlet channel and open the large outlet channel. At this time, the fluid flow rate is medium and the damping force is medium. The fluid damping and the spring assembly jointly isolate vibrations, providing better vibration isolation performance while suppressing the vibration amplitude of the dissipated motor. For small torque output: at this time, the whole vehicle is running or gliding at a uniform speed, and the best vibration isolation performance needs to be provided. The valves in the eight channels in the support partition all close the small outlet channel and open the large outlet channel. At this time, the fluid flow rate is the smallest, the damping force is the smallest, and the spring assembly plays the main vibration isolation component to achieve optimal vibration isolation of the motor.

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