A vibration isolation air bag device for a motor suspension

Abstract

The application discloses a motor suspension vibration isolation air bag device and relates to the technical field of motor vibration isolation of electric vehicles, and aims at the technical problem of poor motor suspension vibration isolation effect, comprising a connecting piece, the bottom end of the connecting piece being provided with an air bag, the bottom end of the air bag being provided with a base, the top end of the base being provided with a circular cavity, the top end of the circular cavity being fixedly provided with an upper barrel body, the bottom end of the upper barrel body being slidably provided with a circular hole, the top end of the upper barrel body being provided with a circular hole, the circular hole being fixedly provided with a ring pipe, the ring pipe being provided with a differential pressure damping assembly, and the lower barrel body being connected with the connecting piece through a connecting assembly. The connecting piece, the air bag and the base form an outer air cavity, the upper barrel body and the lower barrel body form an inner air cavity, the lower barrel body is driven to slide when the motor vibrates, a nonlinear dynamic air pressure difference is generated between the inner air cavity and the outer air cavity, real-time self-adaptive adjustment of the equivalent stiffness of the system is realized, the differential pressure damping assembly in the ring pipe passively dissipates energy, and thus the vibration isolation performance of the motor suspension to wide-frequency variable-amplitude vibration is remarkably improved without external control.

Description

Technical Field

[0001] This invention relates to the field of vibration isolation technology for electric vehicle motors, and more specifically, to a vibration isolation airbag device for motor suspension. Background Technology

[0002] Currently, electric vehicles are rapidly developing towards high performance, long range, high comfort, and low noise, which places more stringent technical requirements on powertrain vibration isolation systems. Compared with traditional internal combustion engine vehicles, electric vehicle drive motors are characterized by fast response, direct torque fluctuations, a wide operating speed range (typically covering 0 to tens of thousands of rpm), and often accompanied by broadband harmonic excitation. Simultaneously, under conditions such as start-stop, acceleration, energy recovery, and road impacts, the powertrain is subjected to a series of complex, time-varying dynamic loads, ranging from extremely low-frequency large-amplitude swaying to high-frequency minute vibrations. Therefore, vibration isolation devices used in electric vehicles need to possess superior broadband vibration isolation performance and adaptive capabilities.

[0003] While existing hydraulic mounts meet vibration isolation requirements to some extent, their core damping channels typically employ a fixed geometry design. This design solidifies the mount's peak damping frequency and dynamic stiffness characteristics, preventing adaptive matching based on real-time vibration frequency and amplitude. Under low-frequency, high-amplitude conditions, the fixed damping channel may cause excessive powertrain swaying due to insufficient damping; conversely, under high-frequency, low-amplitude conditions, excessive damping may transmit excessive high-frequency vibrations and noise, creating a contradictory situation. Although some semi-active or active hydraulic mounts have introduced external control units and actuators to adjust damping, they typically rely on discrete valve switching or multi-channel selection, increasing system complexity, cost, and energy consumption, and posing reliability challenges. Furthermore, their adjustment often fails to achieve continuous, smooth, and adaptive changes in damping channel geometry parameters, making it difficult to achieve optimal vibration isolation across a wide frequency range. Therefore, we propose a vibration isolation airbag device for motor mounts. Summary of the Invention

[0004] The purpose of this invention is to provide a vibration isolation airbag device for motor suspension to solve the technical problem of poor vibration isolation effect of motor suspension.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vibration isolation airbag device for motor suspension, comprising a connector, an outer airbag fixedly mounted at the bottom end of the connector, a base fixedly mounted at the bottom end of the outer airbag, a circular cavity formed at the top end of the base, the gap between the connector, the outer airbag, and the circular cavity forming an outer air chamber, an upper barrel fixedly mounted at the top end of the circular cavity, a lower barrel slidably mounted at the bottom end of the upper barrel, the gap between the upper barrel and the lower barrel forming an inner air chamber, the initial air pressure of the inner air chamber being equal to that of the outer air chamber, a circular hole formed at the top end of the upper barrel, and a ring tube fixedly mounted on the circular hole. The ring tube is equipped with a differential pressure damping component. The lower barrel and the connecting member are connected by a connecting component. When the motor vibrates, the connecting member moves accordingly. This movement is directly transmitted to the lower barrel through the connecting component, driving the lower barrel to slide axially relative to the fixed upper barrel. The change in the volume of the inner air chamber leads to a change in air pressure. At the same time, the volume of the outer air chamber also changes due to the displacement of the connecting member and the lower barrel, resulting in pressure changes. This causes a nonlinear dynamic air pressure difference between the inner and outer air chambers. The overall equivalent stiffness of the system changes nonlinearly in real time with the vibration amplitude, reducing the vibration amplitude. This invention uses the connecting member, the outer air chamber, and the base to form the outer air chamber. The inner air chamber, formed by the upper and lower barrels, drives the lower barrel to slide when the motor vibrates, causing a nonlinear dynamic air pressure difference between the inner and outer air chambers. This achieves real-time adaptive adjustment of the system's equivalent stiffness. Simultaneously, the differential pressure damping component in the ring tube passively dissipates energy, thus significantly improving the vibration isolation performance of the motor suspension against wide-frequency amplitude vibrations without the need for external control.

[0006] Preferably, a connecting ring groove A is formed on the bottom surface of the connector, and the top of the outer airbag is sealed to the connecting ring groove A by vulcanization bonding. A ball groove A is formed at the center of the bottom of the connector.

[0007] Preferably, the top of the base is provided with a connecting ring groove B, and the bottom of the outer airbag is sealed to the connecting ring groove B by vulcanization bonding.

[0008] Preferably, the top of the upper barrel and the top of the circular cavity are fixedly connected by a plurality of fixing plates arranged in a ring with equal spacing. At least one groove is provided at the bottom of the outer surface of the upper barrel, and a sealing ring is embedded in the groove. The sealing ring is movably connected to the inner surface of the lower barrel.

[0009] Preferably, the lower barrel body has several movable grooves at positions relative to the fixed plates, movable blocks are movably mounted on the movable grooves, and a limiting rod is fixedly mounted on the top of the movable block. The top of the limiting rod extends out of the movable groove and is fixedly connected to the bottom of the fixed plate.

[0010] Preferably, the differential pressure damping assembly includes two pistons, which are movably disposed in the annular tube in an up-down structure. The two pistons are fixedly connected by a vertical shaft. The gap between the two pistons, the vertical shaft, and the inner surface of the annular tube forms a damping liquid cavity, which is filled with damping liquid. A damping unit is movably disposed on the vertical shaft, and the damping unit is fixedly connected to the inner surface of the annular tube.

[0011] Preferably, the damping unit includes a fixed ring block and a movable ring block arranged vertically. The fixed ring block is movably mounted on the vertical axis and fixedly connected to the inner surface of the ring tube. The fixed ring block has a plurality of mounting holes A evenly distributed on it. The movable ring block is movably mounted on the vertical axis and movably connected to the inner surface of the ring tube. The movable ring block has a plurality of mounting holes B opposite to the mounting holes A. The mounting holes B are connected to the mounting holes A through a folded tube. The movable ring block has a plurality of through slots evenly distributed on it.

[0012] Preferably, the differential pressure damping assembly further includes spring A and spring B. Spring A is fixed to the top of the piston located above, and spring B is fixed to the bottom of the piston located below. The bottom of spring B is fixedly connected to the bottom of the lower barrel. In the initial state, the adjacent coils of spring B are in contact with each other.

[0013] Preferably, the connecting assembly includes a connecting plate, which is disposed above the upper barrel and fixedly connected to the top of the spring A. The bottom end of the connecting plate is fixedly connected to the top end of the lower barrel by a plurality of connecting rods arranged in a circular and equally spaced structure. A ball groove B is provided at the top end of the connecting plate, and the ball groove B is connected to the ball groove A by a ball rod unit.

[0014] Preferably, the cue unit includes two spheres, which are movably connected to the ball groove B and the ball groove A, respectively, and the two spheres are fixedly connected by a cue body.

[0015] The beneficial effects of this invention are:

[0016] 1. This invention forms an outer air chamber through a connector, an outer air bladder, and a base, and an inner air chamber formed by an upper and lower barrel. When the motor vibrates, the lower barrel is driven to slide, causing a nonlinear dynamic air pressure difference between the inner and outer air chambers. This enables real-time adaptive adjustment of the system's equivalent stiffness. At the same time, the energy is passively dissipated through the pressure difference damping component in the ring pipe, thereby significantly improving the vibration isolation performance of the motor suspension against wide-frequency amplitude vibrations without the need for external control.

[0017] 2. This invention, through the structural design of the damping unit, enables the damping fluid to flow through the folded tube when the pressure difference between the inner and outer air chambers drives the vertical shaft and piston assembly to move axially within the annular tube. The inner surface of the folded tube creates resistance to the flow of the damping fluid, thereby achieving energy dissipation and vibration reduction. During this process, since the fixed ring block remains in a fixed position, while the movable ring block can float axially along the vertical axis to a limited extent, the force exerted by the damping fluid on the folded tube causes the folded tube to expand and contract, thereby changing the internal flow channel length and pleat shape of the folded tube. This dynamically adjusts the flow resistance, causing the flow channel resistance to change, achieving adaptive adjustment of the damping characteristics, further improving the vibration isolation performance, and thus further solving the technical problem of poor vibration isolation effect of motor suspension.

[0018] 3. This invention, through the coordinated design of the connecting components, spring A, and spring B, ensures that when the connecting disc moves downward, it causes spring A to shorten, and the lower barrel causes spring B to extend, until spring A shortens to a rigid state where adjacent spiral rings contact. The connecting disc then drives the piston to move downward synchronously via spring B. At the instant the connecting disc resets and begins to move upward, under the combined force of springs A and B, and the pressure difference, the piston continues to move downward, spring A begins to extend, and spring B begins to shorten, until spring B returns to its initial rigid state. The lower barrel then drives the piston to move upward via spring B. This reciprocating motion creates a hysteretic reciprocating motion between the piston and the ring tube. This hysteretic motion allows the damping fluid to flow continuously and fully within the damping unit, fully utilizing the adaptive flow resistance adjustment function of the damping unit. Simultaneously, it better copes with various vibration conditions, such as high-frequency small amplitude and low-frequency large amplitude, enabling the system to achieve effective stiffness and damping for motor vibrations of different amplitudes and frequencies. This significantly improves the dissipation efficiency of the vibration isolation airbag device for motor vibration, effectively weakens the transmission of motor vibration to the vehicle body, and further enhances the vibration isolation and damping effect of the motor mount. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention.

[0021] Figure 3 This is a cross-sectional structural diagram of the connector, external airbag, and base of the present invention.

[0022] Figure 4 This is a cross-sectional structural diagram of the upper barrel, lower barrel, ring pipe, differential pressure damping assembly, and connecting assembly of the present invention.

[0023] Figure 5 This is a schematic cross-sectional view of the upper barrel body of the present invention.

[0024] Figure 6This is a schematic cross-sectional view of the annular pipe and differential pressure damping assembly of the present invention.

[0025] Figure 7 This is a schematic diagram of the disassembled structure of the differential pressure damping component of the present invention.

[0026] Figure 8 This is a cross-sectional structural diagram of the differential pressure damping component of the present invention.

[0027] Figure 9 This is a cross-sectional structural diagram of the lower barrel and connecting components of the present invention.

[0028] Figure 10 This is a cross-sectional structural diagram of the lower barrel body of the present invention.

[0029] Explanation of the labels in the diagram:

[0030] 1. Connector; 2. External airbag; 3. Base; 4. Upper tank; 5. Lower tank; 6. Ring pipe; 7. Differential pressure damping assembly; 8. Connecting assembly;

[0031] 11. Connecting ring groove A; 12. Ball groove A;

[0032] 31. Circular cavity; 32. Connecting annular groove B;

[0033] 41. Round hole; 42. Fixing plate; 43. Sealing ring;

[0034] 51. Movable groove; 52. Movable block; 53. Limiting rod;

[0035] 71. Piston; 72. Vertical shaft; 73. Damping unit; 74. Spring A; 75. Spring B;

[0036] 731. Fixed ring block; 732. Mounting hole A; 733. Movable ring block; 734. Mounting hole B; 735. Folded tube; 736. Through groove;

[0037] 81. Connecting plate; 82. Connecting rod; 83. Ball groove B; 84. Ball; 85. Rod body. Detailed Implementation

[0038] like Figures 1 to 10As shown, this invention relates to a vibration isolation airbag device for motor suspension, comprising a connector 1, an outer airbag 2 fixedly mounted at the bottom end of the connector 1, a base 3 fixedly mounted at the bottom end of the outer airbag 2, a circular cavity 31 formed at the top end of the base 3, the gap between the connector 1, the outer airbag 2, and the circular cavity 31 forming an outer air chamber, an upper barrel 4 fixedly mounted at the top end of the circular cavity 31, a lower barrel 5 slidably mounted at the bottom end of the upper barrel 4, the gap between the upper barrel 4 and the lower barrel 5 forming an inner air chamber, the initial air pressure of the inner air chamber being equal to that of the outer air chamber, a circular hole 41 formed at the top end of the upper barrel 4, a ring tube 6 fixedly mounted on the circular hole 41, a differential pressure damping component 7 disposed within the ring tube 6, and the lower barrel 5 being connected to the connector 1 via a connecting component 8. The connector 1 of this invention is used to connect to the motor, and the base 3 of this invention is used to connect to the vehicle body. Through the above-described configuration, when the motor vibrates, the connector 1 connected to the motor moves accordingly. The motion is directly transmitted to the lower barrel 5 via the connecting component 8, causing the lower barrel 5 to slide axially relative to the fixed upper barrel 4. This movement of the lower barrel 5 results in a change in the volume of the enclosed inner air cavity formed by the two. Simultaneously, the volume of the outer air cavity formed by the outer airbag 2 and the circular cavity 31 on the base 3 also changes due to the displacement of the connecting component 1 and the lower barrel 5. Since the initial air pressure of the inner and outer air cavities is balanced, when the lower barrel 5 moves, a dynamic pressure difference is instantaneously generated between the inner and outer air cavities due to the phase or amplitude difference in volume change. The greater the pressure difference, the greater the overall equivalent stiffness of the system. This pressure difference also acts on the annular pipe 6, which serves as a connecting channel, driving the movement... The differential pressure damping component 7 inside the ring pipe 6 starts working and consumes energy. By setting up an inner air chamber and an outer air chamber, when the barrel 5 is driven to move by the motor vibration, the change in the volume of the inner air chamber and the outer air chamber will spontaneously generate a nonlinear dynamic air pressure difference. This pressure difference causes the overall equivalent stiffness of the system to change nonlinearly in real time with the vibration amplitude. During small-amplitude high-frequency vibration, the pressure difference is small, and the system maintains low stiffness, ensuring excellent high-frequency sound insulation performance. During large-amplitude low-frequency impact, the pressure difference increases sharply, the system stiffness is significantly enhanced, and the large displacement of the motor is effectively suppressed. This process is completely passive and adaptive, without the need for external control, which improves the vibration isolation performance of the motor suspension and solves the technical problem of poor vibration isolation effect of the motor suspension.

[0039] In embodiments of the present invention, such as Figure 2 and Figure 3 As shown, a connecting ring groove A11 is provided on the bottom surface of the connector 1, and the top of the outer airbag 2 is sealed to the connecting ring groove A11 by vulcanization bonding. A ball groove A12 is provided at the center of the bottom of the connector 1.

[0040] In embodiments of the present invention, such as Figure 2 and Figure 3 As shown, a connecting ring groove B32 is provided at the top of the base 3, and the bottom of the outer airbag 2 is sealed to the connecting ring groove B32 by vulcanization bonding.

[0041] In embodiments of the present invention, such as Figure 2 , Figure 4 and Figure 5 As shown, the top of the upper barrel 4 is fixedly connected to the top of the circular cavity 31 by a plurality of fixing plates 42 arranged in a ring with equal spacing. At least one groove is provided at the bottom of the outer surface of the upper barrel 4, and a sealing ring 43 is embedded in the groove. The sealing ring 43 is movably connected to the inner surface of the lower barrel 5. The present invention prevents the inner air cavity and the outer air cavity from being replaced in the gap between the upper barrel 4 and the lower barrel 5 by setting the sealing ring 43. The sealing ring 43 is made of a material with a low coefficient of friction.

[0042] In embodiments of the present invention, such as Figure 9 and Figure 10 As shown, the lower barrel 5 has several movable grooves 51 positioned relative to several fixed plates 42. Movable blocks 52 are movably mounted on the movable grooves 51, and a limiting rod 53 is fixedly mounted on the top of each movable block 52. The top of the limiting rod 53 extends through the movable groove 51 and is fixedly connected to the bottom of the fixed plate 42. Through this arrangement, when the lower barrel 5 moves relative to the upper barrel 4, the limiting rod 53 and the movable block 52 slide relative to the movable grooves 51, preventing the lower barrel 5 from rotating relative to the upper barrel 4.

[0043] In embodiments of the present invention, such as Figure 4 and Figure 6 As shown, the differential pressure damping assembly 7 includes two pistons 71, which are movably positioned vertically within the annular tube 6. The two pistons 71 are fixedly connected by a vertical shaft 72. The gap between the two pistons 71, the vertical shaft 72, and the inner surface of the annular tube 6 forms a damping fluid chamber filled with damping fluid. A damping unit 73 is movably mounted on the vertical shaft 72 and is fixedly connected to the inner surface of the annular tube 6. Through this arrangement, when a dynamic pressure difference is generated between the inner and outer air chambers, this pressure difference acts on the pistons 71, pushing the two pistons 71 and the vertical shaft 72, which connects them, to move axially along the annular tube 6. This causes the damping fluid in the damping fluid chamber to pass through the damping unit 73, which resists the flow of the damping fluid, thereby achieving energy dissipation and vibration reduction.

[0044] In embodiments of the present invention, such as Figure 6 , Figure 7 and Figure 8As shown, the damping unit 73 includes a fixed ring block 731 and a movable ring block 733 arranged in an upper and lower structure. The fixed ring block 731 is movably mounted on the vertical shaft 72 and fixedly connected to the inner surface of the ring tube 6. The fixed ring block 731 is evenly provided with a plurality of mounting holes A732. The movable ring block 733 is movably mounted on the vertical shaft 72 and movably connected to the inner surface of the ring tube 6. The movable ring block 733 is provided with a plurality of mounting holes B734 at positions opposite to the plurality of mounting holes A732. The mounting holes B734 are connected to the mounting holes A732 through a folded tube 735. The movable ring block 733 is evenly provided with a plurality of through slots 736. This invention, through the structural design of the damping unit 73, enables the damping fluid to flow through the folded tube 735 when the pressure difference between the inner and outer air chambers drives the vertical shaft 72 and piston 71 assembly to move axially within the annular tube 6. The inner surface of the folded tube 735 creates resistance to the flow of the damping fluid, thereby achieving energy dissipation and vibration reduction. During this process, since the fixed ring block 731 remains in a fixed position, while the movable ring block 733 can float axially along the vertical shaft 72 to a limited extent, the force exerted by the damping fluid on the folded tube 735 causes the folded tube 735 to expand and contract, thereby changing the internal flow channel length and pleat shape of the folded tube 735. This dynamically adjusts the flow resistance, causing the flow channel resistance to change, achieving adaptive adjustment of the damping characteristics, further improving the vibration isolation performance, and thus further solving the technical problem of poor vibration isolation effect of motor suspension.

[0045] In embodiments of the present invention, such as Figure 4 and Figure 6 As shown, the differential pressure damping assembly 7 also includes spring A74 and spring B75. Spring A74 is fixed to the top of the upper piston 71, and spring B75 is fixed to the bottom of the lower piston 71. The bottom of spring B75 is fixedly connected to the bottom of the lower barrel 5. In the initial state, the adjacent coils of spring B75 are in contact with each other.

[0046] In embodiments of the present invention, such as Figure 4 and Figure 9As shown, the connecting assembly 8 includes a connecting plate 81, which is located above the upper barrel 4 and fixedly connected to the top of the spring A74. The bottom of the connecting plate 81 is fixedly connected to the top of the lower barrel 5 by a plurality of connecting rods 82 arranged in a circular and equally spaced structure. The top of the connecting plate 81 has a ball groove B83, which is connected to the ball groove A12 by a ball rod unit. The ball rod unit includes two balls 84, which are movably connected to the ball groove B83 and the ball groove A12 respectively. The two balls 84 are fixedly connected by a rod 85. This invention utilizes the coordinated design of connecting component 8, spring A74, and spring B75. Springs A74 and B75 assist the operation of differential pressure damping component 7, allowing for a higher damping setting. When motor vibration acts on connecting component 1, the force exerted by the ball joint unit on connecting plate 81 causes connecting plate 81 to drive the lower barrel 5 to move. This converts any possible all-directional vibrations of the motor into a single axial motion for transmission. Due to the slow movement speed of piston 71, as connecting plate 81 moves downward, it causes spring A74 to shorten, and lower barrel 5 causes spring B75 to extend, until spring A74 shortens to a rigid state where adjacent helical rings contact. Connecting plate 81 then drives piston 71 to move downward synchronously via spring B75. At the instant connecting plate 81 resets and begins to move upward, under the action of springs A74, B75, and differential pressure, piston 71 continues to move downward, spring A74 begins to extend, and spring B75 begins to shorten, until spring B75 returns to its initial rigid state. The lower barrel 5 drives the piston 71 to move upward via spring B75. This reciprocating motion creates a hysteretic reciprocating motion of the piston 71 relative to the ring tube 6. This hysteretic motion allows the damping fluid to flow continuously and fully within the damping unit 73. The folded tube 735 continuously expands and contracts with the flow of the damping fluid, dynamically adjusting the flow resistance to match the amplitude and frequency of the vibration. Simultaneously, the pressure difference between the inner and outer air chambers continuously changes dynamically with the hysteretic motion of the piston 71. The equivalent stiffness of the system also adaptively adjusts synchronously with this pressure difference, achieving multi-level continuous dissipation of motor vibration energy. This allows the adaptive flow resistance adjustment function of the damping unit 73 to be fully utilized, while better coping with various vibration conditions such as high-frequency small amplitude and low-frequency large amplitude. The system can achieve effective stiffness and damping for motor vibrations of different amplitudes and frequencies, significantly improving the dissipation efficiency of the vibration isolation airbag device for motor vibration, effectively weakening the transmission of motor vibration to the vehicle body, and further improving the vibration isolation and damping effect of the motor mount.

[0047] Working principle: This embodiment provides a motor-mounted vibration isolation airbag device. In use, first, the top of the connector 1 of this device is fixedly connected to the preset mounting position of the electric vehicle motor, and then the base 3 is fastened to the corresponding mounting structure of the vehicle body to complete the overall assembly of the device. After assembly, the inner air chamber and the outer air chamber are in an initial air pressure balance state, the adjacent coils of spring B75 are in contact with each other to maintain rigidity, spring A74 is in a natural extension and contraction state, and the piston 71, vertical shaft 72 and damping unit 73 in the differential pressure damping assembly 7 are all in the initial position.

[0048] When the motor vibrates during operation, the vibration force is directly transmitted to the connected component 1. The connected component 1 is displaced with the vibration, and this displacement is transmitted to the connecting plate 81 through the ball rod unit. Since the ball 84 of the ball rod unit can rotate flexibly in the ball groove A12 and ball groove B83, it can convert the possible radial, circumferential and other multi-directional vibrations of the motor into the axial movement of the connecting plate 81, and then drive the lower barrel 5 to slide axially relative to the fixed upper barrel 4 through the connecting rod 82.

[0049] When the lower barrel 5 slides, the volume of the inner air cavity formed by it and the upper barrel 4 changes instantly. At the same time, the displacement of the connecting piece 1 causes the outer air bag 2 to deform. The deformation of the outer air bag 2 and the change in the position of the upper barrel 4 cause the volume of the outer air cavity to change as well. Since the initial air pressure of the inner air cavity and the outer air cavity is balanced, the change in the volume of the inner air cavity and the outer air cavity will spontaneously generate a nonlinear dynamic air pressure difference. This pressure difference causes the overall equivalent stiffness of the system to change nonlinearly in real time with the vibration amplitude, thereby enabling the system stiffness to adaptively adjust in real time with the vibration amplitude, effectively suppressing the large displacement of the motor and reducing the vibration amplitude.

[0050] Meanwhile, the air pressure difference acts on the two pistons 71 inside the ring tube 6, pushing the pistons 71 and the fixedly connected vertical shaft 72 to move axially along the ring tube 6. During this process, when the connecting plate 81 moves downward, it compresses the spring A74 until the adjacent spiral rings of the spring A74 contact and reach a rigid state. The combined force of the spring B75, the spring A74, and the pressure difference drives the piston 71 to move downward synchronously. When the lower barrel 5 slides downward, it stretches the spring B75, causing it to break away from its initial rigid state. When the connecting plate 81 returns to its original position and moves upward with the vibration of the motor, under the combined action of the rebound force of the spring A74, the contraction force of the spring B75, and the pressure difference between the inner and outer air chambers, the piston 71 will maintain a brief downward displacement trend. The spring A74 gradually extends, and the spring B75 gradually contracts until the spring B75 returns to its initial rigid state. Then, the lower barrel 5 drives the piston 71 to move upward through the spring B75. This process repeats, forming a hysteretic reciprocating motion of the piston 71 relative to the ring tube 6.

[0051] The hysteresis motion of piston 71 drives the damping fluid in the damping fluid chamber to flow continuously back and forth in the damping unit 73. When the damping fluid flows through the folded tube 735, the folded tube 735 will expand and contract due to the impact force of the damping fluid, dynamically changing the length of the internal flow channel and the fold shape, thereby adaptively adjusting the flow channel resistance to match the damping requirements under different vibration conditions. At the same time, the damping unit 73 generates continuous resistance to the flow of the damping fluid, realizing the dissipation of vibration energy.

[0052] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A vibration isolation airbag device for motor suspension, characterized in that, Includes a connector (1), an outer airbag (2) fixed at the bottom of the connector (1), a base (3) fixed at the bottom of the outer airbag (2), a circular cavity (31) opened at the top of the base (3), the gap between the connector (1), the outer airbag (2) and the circular cavity (31) forms an outer air chamber, an upper barrel (4) fixed at the top of the circular cavity (31), a lower barrel (5) slidably provided at the bottom of the upper barrel (4), the gap between the upper barrel (4) and the lower barrel (5) forms an inner air chamber, the initial air pressure of the inner air chamber is equal to that of the outer air chamber, a circular hole (41) opened at the top of the upper barrel (4), a ring tube (6) fixed on the circular hole (41), a pressure differential damping component (7) provided in the ring tube (6), and the lower barrel (5) connected to the connector (1) through a connecting component (8); The differential pressure damping assembly (7) includes two pistons (71), which are movably disposed in the annular tube (6) in an up-down structure. The two pistons (71) are fixedly connected by a vertical shaft (72). The gap between the two pistons (71), the vertical shaft (72), and the inner surface of the annular tube (6) forms a damping liquid cavity, which is filled with damping liquid. A damping unit (73) is movably disposed on the vertical shaft (72), and the damping unit (73) is fixedly connected to the inner surface of the annular tube (6). The damping unit (73) includes a fixed ring block (731) and a movable ring block (733) arranged in an upper and lower structure. The fixed ring block (731) is movably mounted on the vertical shaft (72) and fixedly connected to the inner surface of the ring tube (6). The fixed ring block (731) is evenly provided with a plurality of mounting holes A (732). The movable ring block (733) is movably mounted on the vertical shaft (72) and movably connected to the inner surface of the ring tube (6). The movable ring block (733) is provided with a plurality of mounting holes B (734) at positions opposite to the plurality of mounting holes A (732). The mounting holes B (734) are connected to the mounting holes A (732) through a folded tube (735). The movable ring block (733) is evenly provided with a plurality of through slots (736). When the motor vibrates, the connecting piece (1) moves accordingly. This movement is directly transmitted to the lower barrel (5) through the connecting component (8), driving the lower barrel (5) to slide axially relative to the fixed upper barrel (4). The change in the volume of the inner air chamber causes a change in the air pressure. At the same time, the volume of the outer air chamber also changes due to the displacement of the connecting piece (1) and the displacement of the lower barrel (5), resulting in a pressure change. This causes a nonlinear dynamic air pressure difference between the inner and outer air chambers. The overall equivalent stiffness of the system changes nonlinearly in real time with the vibration amplitude, reducing the vibration amplitude.

2. The vibration isolation airbag device for motor suspension according to claim 1, characterized in that, The bottom surface of the connector (1) is provided with a connecting ring groove A (11), and the top of the external airbag (2) is sealed to the connecting ring groove A (11) by vulcanization bonding. The center of the bottom of the connector (1) is provided with a ball groove A (12).

3. The vibration isolation airbag device for motor suspension according to claim 1, characterized in that, The base (3) has a connecting ring groove B (32) at the top, and the bottom of the external airbag (2) is sealed to the connecting ring groove B (32) by vulcanization bonding.

4. The vibration isolation airbag device for motor suspension according to claim 1, characterized in that, The top of the upper barrel (4) is fixedly connected to the top of the circular cavity (31) by a number of fixed plates (42) arranged in a ring with equal spacing. At least one groove is provided at the bottom of the outer surface of the upper barrel (4), and a sealing ring (43) is embedded in the groove. The sealing ring (43) is movably connected to the inner surface of the lower barrel (5).

5. The vibration isolation airbag device for motor suspension according to claim 4, characterized in that, The lower barrel (5) has several movable slots (51) at positions relative to several fixed plates (42). Movable blocks (52) are movably mounted on the movable slots (51). A limiting rod (53) is fixedly mounted on the top of the movable block (52). The top of the limiting rod (53) extends out of the movable slot (51) and is fixedly connected to the bottom of the fixed plate (42).

6. The vibration isolation airbag device for motor suspension according to claim 2, characterized in that, The differential pressure damping assembly (7) also includes spring A (74) and spring B (75). Spring A (74) is fixed to the top of the piston (71) located above, and spring B (75) is fixed to the bottom of the piston (71) located below. The bottom of spring B (75) is fixedly connected to the bottom of the lower barrel (5). In the initial state, the adjacent coils of the spring B (75) are in contact with each other.

7. The vibration isolation airbag device for motor suspension according to claim 6, characterized in that, The connecting assembly (8) includes a connecting plate (81), which is located above the upper barrel (4) and fixedly connected to the top of the spring A (74). The bottom end of the connecting plate (81) is fixedly connected to the top end of the lower barrel (5) by a plurality of connecting rods (82) arranged in a circular and equally spaced structure. The top end of the connecting plate (81) is provided with a ball groove B (83), which is connected to the ball groove A (12) through a ball rod unit.

8. The vibration isolation airbag device for motor suspension according to claim 7, characterized in that, The cue unit includes two spheres (84), which are movably connected to the ball groove B (83) and the ball groove A (12) respectively, and the two spheres (84) are fixedly connected by a rod (85).

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