Magnetorheological damper integrated with air spring

Abstract

The utility model discloses a magneto-rheological damper integrated with an air spring, which comprises a piston rod, the air spring, a magnet exciting coil, a permanent magnet, a floating piston and the like, the air spring is arranged at the upper end of the damper and is tightly matched with the piston rod, an annular groove is processed on the magnet exciting piston, and the permanent magnet is arranged in the annular groove. The excitation coil is arranged in an annular groove machined in the excitation piston, and the permanent magnet is arranged on the inner side of the excitation coil. The air spring is filled with rigid gas, when the piston rod is compressed, the air spring starts to act, and when the air spring moves, rigid acting force is provided for the damper. The permanent magnet is additionally arranged on the inner side of the magnet exciting coil, meanwhile, two damping gaps are arranged, the area of a working area of magnetorheological fluid is increased, the damping force of the magnetorheological damper is increased, the adjustable range of the damping force of the magnetorheological damper is enlarged, the output damping force can be increased under a small-size cylinder body, and the control precision is improved.

Description

Technical Field

[0001] The utility model relates to a magnetorheological damper, in particular to a magnetorheological damper integrated with an air spring. Background Technique

[0002] During the driving process of an automobile, due to the uneven road surface, the vehicle will experience general vibration phenomena. When the wheels roll on rough roads, they will encounter and generate vibrations, which are transmitted upward through the suspension system and ultimately affect the vehicle body and passengers. Such vibrations not only weaken the riding comfort, but also may interfere with the vehicle's handling and stability in extreme cases. During the vehicle design stage, vibration control is an indispensable part, which is crucial for improving the passenger's comfort experience and ensuring the stability of vehicle handling.

[0003] Traditional automotive suspension systems usually adopt separate air springs or magnetorheological dampers. The air spring mainly provides buffering, while the magnetorheological damper stabilizes the vehicle's driving by adjusting the damping force. These traditional designs have problems such as large occupied installation space and insufficient adjustment accuracy. Installing the air spring and the magnetorheological damper independently not only increases the system complexity but also limits the optimization space of performance. Summary of the Invention

[0004] In order to overcome the problems described in the background technique, the utility model proposes a magnetorheological damper integrated with an air spring. An air spring is added to a conventional magnetorheological damper, a permanent magnet is placed inside the excitation piston and two damping gaps are set. The air spring enables the magnetorheological damper to have a longer buffering space and stronger damping rigidity, making the damper a variable stiffness and variable damping integrated damper. Secondly, the permanent magnet inside the magnetorheological damper enhances the magnetic field intensity of the excitation coil, increasing the action range on the magnetorheological fluid. In addition, the two damping gaps increase the flow rate of the magnetorheological fluid, enabling the better exertion of the physical properties of the magnetorheological fluid; making the damping effect of the magnetorheological damper better, the adjustment range larger, and the adjustment methods more, and it is especially suitable for automotive suspension systems.

[0005] A magnetorheological damper integrated with an air spring, characterized in that: an upper hanger (1), an upper end cover of the air spring (2), a piston rod (3), an upper end cover of the damper (4), a magnetorheological damper (5), an upper end cover of the excitation piston (6), a screw I (7), a lower end cover of the excitation piston (8), a damper cylinder body (9), a lower end cover of the damper (10), a lower hanger (11), a floating piston (12), a sealing ring II (13), a nut (14), a screw II (15), a permanent magnet (16), an excitation coil (17), a sealing ring I (18), an excitation piston (19), an air spring (20); the upper hanger (1) is tightly connected to the upper end cover of the air spring (2), the air spring (20) is placed on the upper end of the magnetorheological damper (5) and is tightly connected to the upper end cover of the air spring (2), the air spring (20) is tightly fitted with the piston rod (3), the upper end cover of the damper (4) is in clearance fit with the piston rod (3), the lower end of the piston rod (3) is machined with an external thread, the excitation piston (19) is machined with an internal thread, and the excitation piston (19) is threadedly and tightly connected to the external thread machined on the piston rod (3) through the machined internal thread. The upper end cover of the excitation piston (6) is tightly connected to the excitation piston (19) through the screw I (7). A circular groove is machined on the outer side of the excitation piston (19), and the sealing ring I (18) is sealed with the damper cylinder body (9) through the circular groove machined on the excitation piston (19). An annular groove is machined on the inner side of the excitation piston (19), the excitation coil (17) is placed in the annular groove, the permanent magnet (16) is placed inside the excitation coil (17), the lower end cover of the excitation piston (8) is tightly connected to the excitation piston (19) through the screw II (15), the lower surface of the excitation piston (19) is machined with an external thread, and the nut (14) is threadedly and tightly connected to the excitation piston (19) through the external thread. The floating piston (12) is below the excitation piston (19), a circular groove is machined on the outer side of the floating piston (12), and the sealing ring II (13) is sealed with the damper cylinder body (9) through the circular groove machined on the floating piston (12). The lower end cover of the damper (10) is tightly fitted with the damper cylinder body (9), and the lower hanger (11) is tightly connected to the lower end cover of the damper (10).

[0006] Compared with the background technology, the beneficial effects of the present utility model are as follows:

[0007] By adding an air spring filled with rigid gas to the magnetorheological damper of the present utility model, a section of rigid power is provided, so that the magnetorheological damper has a dual adjustment effect of variable stiffness and variable damping.

[0008] By adding a permanent magnet inside the excitation piston to cooperate with the excitation coil in the magnetorheological damper of the present utility model, the permanent magnet enhances the magnetic field of the excitation coil, increases the damping force and adjustable range of the damper. At the same time, two damping gaps are arranged inside the excitation piston, increasing the flow rate of the magnetorheological fluid in the excitation piston and providing a stronger damping effect.

[0009] The air spring and the magnetorheological damper of the present utility model are independent of each other. By controlling and adjusting the air pressure of the air spring and the current of the excitation coil of the magnetorheological damper respectively, four control modes can be formed to output the driving force. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of a magnetorheological damper integrated with an air spring.

[0011] Figure 2 It is a schematic structural diagram of the upper end cover of the excitation piston of a magnetorheological damper integrated with an air spring. Detailed Embodiment

[0012] As Figure 1 shown, the present utility model includes: upper suspension ear (1), upper end cover of air spring (2), piston rod (3), upper end cover of damper (4), magnetorheological damper (5), upper end cover of excitation piston (6), screw Ⅰ (7), lower end cover of excitation piston (8), damper cylinder body (9), lower end cover of damper (10), lower suspension ear (11), floating piston (12), sealing ring Ⅱ (13), nut (14), screw Ⅱ (15), permanent magnet (16), excitation coil (17), sealing ring Ⅰ (18), excitation piston (19), air spring (20); wherein, the air spring (20), excitation piston (19), and floating piston (12) divide and form sealed chamber Ⅰ, sealed chamber Ⅱ, sealed chamber Ⅲ, and sealed chamber Ⅳ. Sealed chamber Ⅰ, that is, the inside of the air spring, is filled with rigid gas to provide rigid driving force for the damper. Sealed chamber Ⅱ and sealed chamber Ⅲ are filled with magnetorheological fluid, and sealed chamber Ⅳ is used as a compensation sealed chamber and is filled with compensation gas; a permanent magnet (16) is installed inside the excitation coil (17) to increase the magnetic field strength of the excitation coil in a limited space. The two damping gaps in the excitation piston increase the flow rate of the magnetorheological fluid at the excitation coil, strengthen the damping force in a limited space, and increase the damping force and adjustable range of the damper; the air spring (20) and the magnetorheological damper (5) are independent of each other, and four control modes are formed by controlling and adjusting the air pressure of the air spring and the current of the excitation coil of the magnetorheological damper: the mode of inflating the air spring and energizing the magnetorheological damper has the largest driving force among other modes; the mode of inflating the air spring and not energizing the magnetorheological damper significantly reflects the rigid driving force of the damper; the mode of not inflating the air spring and energizing the magnetorheological damper significantly reflects the variable damping effect of the damper; the mode of not inflating the air spring and not energizing the magnetorheological damper has a smaller damping force than the other three modes.

[0013] Figure 2It is a schematic diagram of the upper end cover of the piston head of the magnetorheological damper of the present utility model. A is the damping gap I, B is the damping gap II, and the C hole is the lead hole. The damping gap I and the damping gap II are magnetorheological fluid channels. The magnetorheological fluid flows between the sealing chamber II and the sealing chamber III through the damping gap I and the damping gap II. The permanent magnet (16) and the excitation coil (17) are installed near the damping gap to act on the magnetorheological fluid flowing through the damping gap. The two damping gaps provide multiple segments of damping force, strengthening the damping effect of the magnetorheological damper, making full use of the physical properties of the magnetorheological fluid, and improving the working efficiency of the magnetorheological damper.

Claims

1. An air spring integrated magnetorheological damper, characterized in that: Upper suspension ear (1), upper end cover of air spring (2), piston rod (3), upper end cover of damper (4), magnetorheological damper (5), upper end cover of excitation piston (6), screw Ⅰ (7), lower end cover of excitation piston (8), damper cylinder block (9), lower end cover of damper (10), lower suspension ear (11), floating piston (12), sealing ring Ⅱ (13), nut (14), screw Ⅱ (15), permanent magnet (16), excitation coil (17), sealing ring Ⅰ (18), excitation piston (19), air spring (20); The upper suspension ear (1) is tightly connected to the upper end cover of the air spring (2). The air spring (20) is placed on the upper end of the magnetorheological damper (5) and is tightly connected to the upper end cover of the air spring (2). The air spring (20) is tightly fitted with the piston rod (3). The upper end cover of the damper (4) is in clearance fit with the piston rod (3). External threads are machined at the lower end of the piston rod (3). Internal threads are machined on the excitation piston (19). The excitation piston (19) is threadedly and tightly connected to the external threads machined on the piston rod (3) through the machined internal threads. The upper end cover of the excitation piston (6) is tightly connected to the excitation piston (19) through the screw Ⅰ (7). A circular groove is machined on the outer side of the excitation piston (19). The sealing ring Ⅰ (18) is sealed with the damper cylinder block (9) through the circular groove machined on the excitation piston (19). An annular groove is machined on the inner side of the excitation piston (19). The excitation coil (17) is placed in the annular groove. The permanent magnet (16) is placed inside the excitation coil (17). The lower end cover of the excitation piston (8) is tightly connected to the excitation piston (19) through the screw Ⅱ (15). External threads are machined on the lower surface of the excitation piston (19). The nut (14) is threadedly and tightly connected to the excitation piston (19) through the external threads. The floating piston (12) is below the excitation piston (19). A circular groove is machined on the outer side of the floating piston (12). The sealing ring Ⅱ (13) is sealed with the damper cylinder block (9) through the circular groove machined on the floating piston (12). The lower end cover of the damper (10) is tightly fitted with the damper cylinder block (9). The lower suspension ear (11) is tightly connected to the lower end cover of the damper (10).

2. The magneto-rheological damper integrated with an air spring according to claim 1, characterized in that: An air spring (20) is added above the magnetorheological damper (5). The air spring (20) is filled with rigid gas. Filling rigid gas with different air pressures can achieve the stiffness adjustment of the damper and form a variable stiffness control effect.

3. The magnetorheological damper integrated with an air spring according to claim 1, characterized in that: Two damping gaps are set in the excitation piston (19), which increases the working area of the magnetorheological fluid in the magnetic field of the excitation piston (19). A permanent magnet (16) is added inside the excitation piston (19), which enhances the magnetic field intensity in a limited space, increases the damping force and adjustable range of the damper, and solves the problem of insufficient space in the integrated damper.

4. The magnetorheological damper integrated with an air spring according to claim 1, wherein: The variable stiffness and variable damping control component of the damper consists of an air spring (20) and a magnetorheological damper (5). The two work independently and can obtain four control modes, namely: the mode where the air spring is inflated and the magnetorheological damper is energized; the mode where the air spring is inflated and the magnetorheological damper is not energized; the mode where the air spring is not inflated and the magnetorheological damper is energized; the mode where the air spring is not inflated and the magnetorheological damper is not energized.

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