Piston assembly, magnetorheological damper, and vehicle

Abstract

The present application relates to a piston assembly, a magnetorheological damper and a vehicle. The piston assembly comprises a piston housing, a coil component and an iron core component, wherein a mounting cavity is provided inside the piston housing, and the piston housing is provided with liquid inlets and liquid outlets; the iron core component comprises a main iron core and auxiliary iron cores, wherein the main iron core and the auxiliary iron cores are arranged in the mounting cavity, the main iron core is sleeved inside the coil component, the auxiliary iron cores are respectively arranged at either end of the main iron core, an axially penetrating central main flow channel is provided in the main iron core, an axially penetrating central auxiliary flow channel is provided in each auxiliary iron core, an outer peripheral wall of each auxiliary iron core and an inner peripheral wall of the piston housing define an edge axial flow channel, one end of each auxiliary iron core and the piston housing define an auxiliary radial flow channel, the other end thereof and the main iron core define a main radial flow channel, and the edge axial flow channels, the central auxiliary flow channel, the auxiliary radial flow channels and the main radial flow channels are in communication with each other. The piston assembly of the present application can increase a damping force without increasing an original size thereof, which is beneficial to reducing the axial size of the magnetorheological damper.

Description

Piston assembly, magnetorheological damper and vehicle

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202411045409.5, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of dampers, in particular, to a piston assembly, a magnetorheological damper and a vehicle. BACKGROUND

[0004] The magnetorheological damper is different from the traditional hydraulic damper. The magnetorheological damper is filled with a magnetorheological liquid in the cylinder, and a coil is arranged on the piston assembly of the magnetorheological damper. The size of the current passing through the coil can be controlled to adjust the damping force of the magnetorheological damper in real time according to the damping target. Due to the excellent controllable performance of the magnetorheological damper, such as continuous adjustable damping, high precision and fast response speed, it is widely used to replace the traditional hydraulic damper, and typical applications include robot devices, automobile clutches, suspension systems, vibration control of large civil structures, etc.

[0005] In the related art, in order to realize that the magnetorheological damper has a larger damping force, multiple coils arranged in the axial direction are usually added on the piston, but the above technical solution will cause the axial size of the piston to be larger, and thus problems such as insufficient installation space of the magnetorheological damper, reduced strength of the piston rod, and increased volume of the damper chamber will be caused. SUMMARY

[0006] The present disclosure aims to at least partially solve one of the technical problems in the related art.

[0007] To this end, an embodiment of the present disclosure proposes a piston assembly, which can increase the damping force when working without increasing the axial size of the piston assembly, thereby being beneficial to reducing the axial size of the magnetorheological damper.

[0008] An embodiment of the present disclosure further proposes a magnetorheological damper.

[0009] An embodiment of the present disclosure further proposes a vehicle.

[0010] The piston assembly of the embodiment of the present disclosure comprises: a piston shell, which is provided with a mounting cavity inside, and is provided with a liquid inlet and a liquid outlet at two axial ends thereof; a coil component, which is coaxially arranged in the mounting cavity; and a core component, which comprises a main core and an auxiliary core, and is arranged in the mounting cavity, wherein the main core is sleeved in the coil component, the auxiliary core is arranged at one end of the main core along the axial direction of the mounting cavity, the main core is provided with a central main flow channel penetrating in the axial direction, the auxiliary core is provided with a central auxiliary flow channel penetrating in the axial direction, the outer peripheral wall of the auxiliary core and the inner peripheral wall of the piston shell define an edge axial flow channel, one end of the auxiliary core and the piston shell define an auxiliary radial flow channel, and the other end of the auxiliary core and the main core define a main radial flow channel, wherein the edge axial flow channel and the central auxiliary flow channel are in communication with the auxiliary radial flow channel and the main radial flow channel, the main radial flow channel is in communication with the central main flow channel, and the edge axial flow channel is in communication with the liquid inlet and the liquid outlet.

[0011] The piston assembly of the embodiment of the present disclosure comprises: a piston shell, which is provided with a mounting cavity inside, and is provided with a liquid inlet and a liquid outlet at two axial ends thereof; a coil component, which is coaxially arranged in the mounting cavity; and a core component, which comprises a main core and an auxiliary core, and is arranged in the mounting cavity, wherein the main core is sleeved in the coil component, the auxiliary core is arranged at one end of the main core along the axial direction of the mounting cavity, the main core is provided with a central main flow channel penetrating in the axial direction, the auxiliary core is provided with a central auxiliary flow channel penetrating in the axial direction, the outer peripheral wall of the auxiliary core and the inner peripheral wall of the piston shell define an edge axial flow channel, one end of the auxiliary core and the piston shell define an auxiliary radial flow channel, and the other end of the auxiliary core and the main core define a main radial flow channel, wherein the edge axial flow channel and the central auxiliary flow channel are in communication with the auxiliary radial flow channel and the main radial flow channel, the main radial flow channel is in communication with the central main flow channel, and the edge axial flow channel is in communication with the liquid inlet and the liquid outlet.

[0012] In some embodiments, the axial gap of the auxiliary radial flow channel is smaller than the axial gap of the main radial flow channel.

[0013] In some embodiments, the axial gap of the auxiliary radial flow channel is L1, and the axial gap of the main radial flow channel is L2, wherein 0.8mm≤L1≤1.2mm and 2.8mm≤L2≤3.2mm.

[0014] In some embodiments, the auxiliary core is two, and the two auxiliary cores are arranged on two sides of the main core, respectively, and each auxiliary core defines the edge axial flow channel, the auxiliary radial flow channel and the main radial flow channel together with the piston and the main core.

[0015] In some embodiments, the piston shell comprises a piston upper cover, a sleeve core and a piston lower cover, the piston upper cover and the piston lower cover are respectively arranged at two ends of the sleeve core and define the installation cavity with the sleeve core, the piston upper cover has the liquid inlet, the piston lower cover has the liquid outlet, one of the sub-cores defines a group of the edge axial flow channels, the auxiliary radial flow channels and the main radial flow channels communicated with the liquid inlet with the piston upper cover and the sleeve core, and the other of the sub-cores defines another group of the edge axial flow channels, the auxiliary radial flow channels and the main radial flow channels communicated with the liquid outlet with the piston lower cover and the sleeve core.

[0016] In some embodiments, the coil component comprises a coil frame, an electromagnetic coil and a main support, the electromagnetic coil is wound on the coil frame, the main core is installed in the coil frame, the main support comprises a main frame body and a first support arm, the main frame body is sleeved in the main core, the first support arm is arranged at one side of the main frame body along the axial direction of the installation cavity, the coil frame is provided with a first slot adjacent to one side of the sub-core, and the first support arm is installed in the first slot and abuts against the sub-core.

[0017] In some embodiments, the sub-core comprises an auxiliary core, an auxiliary support and an end core, the auxiliary support comprises an auxiliary frame body and a second support arm, the second support arm is arranged at one side of the auxiliary frame body adjacent to the coil frame, the coil frame is provided with a second slot adjacent to one side of the sub-core, the second support arm is installed in the second slot, the auxiliary frame body is sleeved in the end core, the auxiliary core is sleeved in the auxiliary frame body, and the outer peripheral wall of the end core and the inner peripheral wall of the piston shell define the edge axial flow channel, and the auxiliary core is provided with the central auxiliary flow channel penetrating in the axial direction.

[0018] In some embodiments, at least one of the first support arm and the second support arm is a plurality of support arms and is arranged in a spaced manner along the circumferential direction of the auxiliary frame body to separate the main radial flow channels into a plurality of main radial sub-flow channels.

[0019] In some embodiments, the piston assembly further comprises a piston rod and a wire, the piston rod is connected with the piston shell, the piston rod is provided with a wire channel penetrating in the axial direction, the wire channel is communicated with the installation cavity, and the wire is arranged in the wire channel and is electrically connected with the coil component.

[0020] In some embodiments, the piston assembly further comprises a sealing filler, the sealing filler is arranged in the wire channel and wraps the wire; and / or, the piston assembly further comprises a wear strip, the wear strip is sleeved on the outer peripheral wall of the piston shell.

[0021] The magnetorheological damper of another embodiment of the present disclosure comprises a piston assembly, the piston assembly being any one of the piston assemblies of the embodiments of the present disclosure, the piston assembly further comprising a piston rod connected with the piston shell; a cylinder, a frame connecting piece and a suspension connecting piece, the frame connecting piece being arranged at one end of the cylinder, the cylinder being filled with a magnetorheological liquid, the piston assembly being slidingly fitted in the cylinder, one end of the piston rod extending out of the other end of the cylinder and being connected with the suspension connecting piece.

[0022] The vehicle of another embodiment of the present disclosure comprises the magnetorheological damper of the embodiments of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is an axial view of the piston assembly of the embodiment of the present disclosure.

[0024] Fig. 2 is a top view of the piston assembly (without the piston rod) of the embodiment of the present disclosure.

[0025] Fig. 3 is a sectional view of the piston assembly of the embodiment of the present disclosure along the section line A-A in Fig. 2.

[0026] Fig. 4 is a sectional view of the piston assembly of the embodiment of the present disclosure (in a low current working condition) along the section line B-B in Fig. 2.

[0027] Fig. 5 is a sectional view of the piston assembly of the embodiment of the present disclosure (in a high current working condition) along the section line B-B in Fig. 2.

[0028] Fig. 6 is a schematic diagram of the magnetic field distribution of the piston assembly of the embodiment of the present disclosure.

[0029] Fig. 7 is an exploded view of the piston assembly of the embodiment of the present disclosure.

[0030] Fig. 8 is a schematic diagram of the coil component of the piston assembly of the embodiment of the present disclosure.

[0031] Fig. 9 is a schematic diagram of the installation of the coil component, the auxiliary core and the auxiliary support of the piston assembly of the embodiment of the present disclosure.

[0032] Fig. 10 is a schematic diagram of the piston assembly of the embodiment of the present disclosure (without the piston upper cover, the piston lower cover and the piston rod).

[0033] Fig. 11 is a schematic diagram of the piston assembly of the embodiment of the present disclosure (without the piston rod).

[0034] Fig. 12 is an axial view of the magnetorheological damper of the embodiment of the present disclosure.

[0035] Fig. 13 is a partial sectional view of the magnetorheological damper of the embodiment of the present disclosure.

[0036] Fig. 14 is another partial sectional view of the magnetorheological damper of the embodiment of the present disclosure.

[0037] FIG. 15 is a diagram of an application scenario of the magneto-rheological damper according to the embodiment of the present disclosure.

[0038] Reference signs: 1, piston shell; 11, sleeve core; 12, piston upper cover; 121, liquid inlet; 13, piston lower cover; 122, liquid outlet; 14, mounting cavity; 15, auxiliary flow channel end cover; 2, coil component; 21, electromagnetic coil; 22, coil holder; 221, first slot; 222, second slot; 23, main support; 231, main support body; 232, first support arm; 3, core component; 31, main core; 32, auxiliary core; 321, auxiliary core; 322, end core; 323, auxiliary support; 3231, auxiliary support body; 3232, second support arm; 41, piston rod; 411, wire channel; 42, wire; 43, sealing filler; 44, wear-resistant strip; 45, steel wire check ring; 51, cylinder; 511, recovery cavity; 512, compression cavity; 513, air chamber; 52, frame connecting piece; 53, suspension connecting piece; 54, air piston; 55, guide sleeve; 56, oil seal structure; 57, valve core assembly; 58, connecting rod; 61, axle; 62, frame; Q1, central main flow channel; Q2, central auxiliary flow channel; Q3, edge axial flow channel; Q4, auxiliary radial flow channel; Q5, main radial flow channel; Q51, main radial sub-flow channel. DETAILED DESCRIPTION

[0039] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0040] The piston assembly, magneto-rheological damper and vehicle according to the embodiments of the present disclosure are described below with reference to FIGS. 1-15.

[0041] As shown in FIGS. 1-6, the piston assembly according to the embodiments of the present disclosure comprises a piston shell 1, a coil component 2 and a core component 3. The piston shell 1 is provided with a mounting cavity 14 therein, and the piston shell 1 is provided with a liquid inlet 121 and a liquid outlet 122 at two ends thereof along the axial direction (up-down direction in FIG. 3), the coil component 2 is coaxially arranged in the mounting cavity 14, the core component 3 comprises a main core 31 and an auxiliary core 32, and the coil component 2 can generate a magnetic field after being energized to magnetize the main core 31 and the auxiliary core 32.

[0042] The main iron core 31 and the auxiliary iron core 32 are arranged in the mounting cavity 14, the main iron core 31 is sleeved in the coil assembly 2, the auxiliary iron core 32 is arranged at one end of the main iron core 31 along the axial direction of the mounting cavity 14, the main iron core 31 is provided with a central main flow channel Q1 penetrating in the axial direction, the auxiliary iron core 32 is provided with a central auxiliary flow channel Q2 penetrating in the axial direction, the outer peripheral wall of the auxiliary iron core 32 and the inner peripheral wall of the piston shell 1 define an edge axial flow channel Q3, one end of the auxiliary iron core 32 (such as the upper end face of the auxiliary iron core 32 in FIG. 3) and the piston shell 1 define an auxiliary radial flow channel Q4, the other end of the auxiliary iron core 32 (such as the lower end face of the auxiliary iron core 32 in FIG. 3) and the main iron core 31 define a main radial flow channel Q5, the edge axial flow channel Q3 and the central auxiliary flow channel Q2 are in communication with the auxiliary radial flow channel Q4 and the main radial flow channel Q5, the main radial flow channel Q5 is in communication with the central main flow channel Q1, and the edge axial flow channel Q3 is in communication with the liquid inlet 121 and the liquid outlet 122.

[0043] As shown in FIG. 3, the central main flow channel Q1, the edge axial flow channel Q3 and the central auxiliary flow channel Q2 all extend along the axial direction (such as the up-down direction in FIG. 3) of the mounting cavity 14. The auxiliary radial flow channel Q4 and the main radial flow channel Q5 extend along the horizontal direction (i.e., the direction orthogonal to the axial direction of the mounting cavity 14).

[0044] The piston assembly of the embodiment of the present disclosure, by arranging the central auxiliary flow channel Q2 in the auxiliary iron core 32, the outer peripheral wall of the auxiliary iron core 32 and the inner peripheral wall of the piston shell 1 define the edge axial flow channel Q3, one end of the auxiliary iron core 32 and the piston shell 1 define the auxiliary radial flow channel Q4, and the other end of the auxiliary iron core 32 and the main iron core 31 define the main radial flow channel Q5. Therefore, when the piston assembly works, the magnetorheological fluid enters the mounting cavity 14 from the liquid inlet 121, and then flows in the edge axial flow channel Q3 along the axial direction of the mounting cavity 14. Since the edge axial flow channel Q3 and the central auxiliary flow channel Q2 are in communication with the auxiliary radial flow channel Q4 and the main radial flow channel Q5, part of the magnetorheological fluid enters the auxiliary radial flow channel Q4 and the central auxiliary flow channel Q2, and then converges into the central main flow channel Q1 in communication, and the other part of the magnetorheological fluid enters the main radial flow channel Q5, and then converges into the central main flow channel Q1. In this way, the flow path of the magnetorheological fluid in the mounting cavity 14 can be increased, so as to increase the damping force when the piston assembly works, which is beneficial to reduce the axial size of the magnetorheological damper, thereby improving the problems of insufficient installation space of the magnetorheological damper, reduced strength of the piston rod 41 and increased volume of the damper chamber.

[0045] On the other hand, since the main iron core 31 and the auxiliary iron core 32 can be magnetized by the magnetic field of the coil component 2, and the main iron core 31 and the auxiliary iron core 32 jointly construct the edge axial flow channel Q3, the auxiliary radial flow channel Q4, the main radial flow channel Q5, the central auxiliary flow channel Q2 and the central main flow channel Q1, the viscosity of the magneto-rheological fluid rapidly increases after passing through the flow channels, so as to ensure that the magneto-rheological damper can output a large enough damping force.

[0046] As shown in FIG. 6, the magneto-rheological fluid will produce a condensation effect under the action of the magnetic field, so that the viscosity of the liquid increases, and the resistance through the flow channel also increases, thereby generating a damping effect. Therefore, the magnetic field strength of the electromagnetic coil 21 can be adjusted by adjusting the current size, and then the viscosity of the magneto-rheological fluid passing through the flow channel is adjusted, so as to realize the adjustment of the damping force.

[0047] It can be understood that the piston assembly of the embodiment of the present disclosure adopts two directions of radial flow channels and axial annular flow channels to increase the effective damping channels of the piston assembly, so that the present scheme can expand the damping force requirement of the piston assembly without increasing the axial length of the coil, without increasing the volume of the piston structure and the power consumption, and without reducing the strength of the piston rod 41.

[0048] Optionally, the axial gap (such as the up-down direction in FIG. 4) of the auxiliary radial flow channel Q4 is smaller than the axial gap (such as the up-down direction in FIG. 4) of the main radial flow channel Q5.

[0049] It can be understood that the axial gap of the auxiliary radial flow channel Q4 should be smaller. As shown in FIG. 5, when the current exceeds a certain threshold (for example, 1A-2A), the magneto-rheological fluid flowing in the auxiliary radial flow channel Q4 is affected by the magnetic field, and then the flowability of the magneto-rheological fluid is poor. At this time, most of the magneto-rheological fluid can flow into the central main flow channel Q1 through the main radial flow channel Q5, so as to reduce the overall flow of the piston assembly, so as to obtain a higher upper limit of the damping adjustment range under the working condition of high current.

[0050] Similarly, as shown in FIG. 4, when the current is less than a certain threshold (for example, 0-1A), the magneto-rheological fluid flowing in the auxiliary radial flow channel Q4 can maintain good passability, and at this time, most of the magneto-rheological fluid can flow into the central main flow channel Q1 through the main radial flow channel Q5, and a small part of the magneto-rheological fluid can flow into the central main flow channel Q1 through the auxiliary radial flow channel Q4, so as to increase the overall flow of the piston assembly, so as to obtain a lower lower limit of the damping adjustment range under the working condition of low current.

[0051] Therefore, the piston assembly of the embodiment of the present disclosure can change the working flow channel mode of the piston assembly under different adjustment currents by setting the auxiliary radial flow channel Q4, so as to have different adjustment gradients, so that the magneto-rheological damper can consider both high damping segments and low damping segments.

[0052] That is, the magneto-rheological damper has a combined adjustment mode of current adjustment and flow channel adjustment, and ensures lower damping force in a low current section and higher damping force in a high current section.

[0053] Optionally, the axial gap of the auxiliary radial flow channel Q4 is L1, and the axial gap of the main radial flow channel Q5 is L2, wherein 0.8mm≤L1≤1.2mm and 2.8mm≤L2≤3.2mm. For example, L1 can be 0.8mm, 0.9mm, 1.0mm, 1.1mm or 1.2mm. L2 can be 2.8mm, 2.9mm, 3.0mm, 3.1mm or 3.2mm.

[0054] The inventors of the present disclosure found through experimental research that when L1 and L2 adopt the above parameter ranges, on the one hand, the coil component 2 can ensure that the auxiliary radial flow channel Q4 and the main radial flow channel Q5 can flow the magneto-rheological fluid when the coil component 2 is in the current adjustment section of 0-1A, so as to increase the overall flow of the piston assembly, so as to obtain a lower lower limit of the damping adjustment range in the low current working condition. On the other hand, the coil component 2 can ensure that the magneto-rheological fluid in the auxiliary radial flow channel Q4 is blocked, but the magneto-rheological fluid in the main radial flow channel Q5 can normally flow when the coil component 2 is in the current adjustment section of 1-2A, so as to reduce the overall flow of the piston assembly, and obtain a higher upper limit of the damping adjustment range in the high current working condition.

[0055] In some embodiments, as shown in FIGS. 3-6, the two auxiliary cores 32 are arranged on the upper and lower sides of the main core 31, and each auxiliary core 32 defines the edge axial flow channel Q3, the auxiliary radial flow channel Q4 and the main radial flow channel Q5 with the piston and the main core 31. It can be understood that the two auxiliary cores 32 are symmetrically arranged on the upper and lower sides of the main core 31, thereby further increasing the damping force of the piston assembly during operation.

[0056] Specifically, as shown in FIGS. 3-6, the piston shell 1 includes a piston upper cover 12, a sleeve core 11 and a piston lower cover 13, the piston upper cover 12 and the piston lower cover 13 are respectively arranged at the two ends of the sleeve core 11 and define an installation cavity 14 with the sleeve core 11, the piston upper cover 12 has a liquid inlet 121, and the piston lower cover 13 has a liquid outlet 122. One auxiliary core 32 defines a group of edge axial flow channels Q3, auxiliary radial flow channels Q4 and main radial flow channels Q5 in communication with the liquid inlet 121 with the piston upper cover 12 and the sleeve core 11. Another auxiliary core 32 defines another group of edge axial flow channels Q3, auxiliary radial flow channels Q4 and main radial flow channels Q5 in communication with the liquid outlet 122 with the piston lower cover 13 and the sleeve core 11. In other words, the edge axial flow channels Q3, the auxiliary radial flow channels Q4 and the main radial flow channels Q5 are provided with two and arranged on the upper and lower sides of the main core 31. Thus, the damping adjustment range of the magneto-rheological damper can be further expanded.

[0057] As shown in FIG. 4, when the piston assembly is controlled in the low current section (0-1A), the flow path of the MR fluid in the piston assembly is: inlet 121→ edge axial flow channel Q3→ "auxiliary radial flow channel Q4+main radial flow channel Q5"→ central main flow channel Q1→ "auxiliary radial flow channel Q4+main radial flow channel Q5"→ edge axial flow channel Q3→ outlet 122.

[0058] As shown in FIG. 5, when the piston assembly is controlled in the high current section (1A-2A), the flow path of the MR fluid in the piston assembly is: inlet 121→ edge axial flow channel Q3→ main radial flow channel Q5→ central main flow channel Q1→ main radial flow channel Q5→ edge axial flow channel Q3→ outlet 122.

[0059] In some embodiments, as shown in FIGS. 7-9, the coil component 2 includes a coil frame 22, an electromagnetic coil 21, and a main bracket 23, the electromagnetic coil 21 being wound around the coil frame 22. That is, the copper wire of the electromagnetic coil 21 is wound around the coil frame 22, and the coil frame 22 can function to fix the electromagnetic coil 21. A main core 31 is installed in the coil frame 22, and the main bracket 23 includes a main bracket body 231 and a first arm 232, the main bracket body 231 being sleeved around the main core 31, and the first arm 232 being disposed on one side of the main bracket body 231 along the axial direction of the installation cavity 14. The coil frame 22 is provided with a first groove 221 adjacent to one side of the auxiliary core 32, and the first arm 232 is installed in the first groove 221 and abuts against the auxiliary core 32.

[0060] As shown in FIGS. 7-9, the first arm 232 is installed on the first groove 221 to enable the main bracket 23 to be clamped and fixed with the coil frame 22. Since the first arm 232 abuts against the auxiliary core 32, the auxiliary core 32 and the coil frame 22 are spaced apart by a certain distance, and the main radial flow channel Q5 is formed. For example, the first arm 232 can be two or more. The first arms 232 are arranged at intervals along the circumferential direction of the main bracket 23 and extend along the radial direction. The main radial flow channel Q5 is divided into a plurality of fan-shaped main radial sub-flow channels Q51 by the first arms 232. In this way, the distribution of the MR fluid flowing through the main radial flow channel Q5 can be more uniform, and the contact area between the MR fluid and the main core 31 and the auxiliary core 32 can be increased, thereby improving the damping force.

[0061] Further, as shown in FIGS. 3-6 and 9, the sub-core 32 includes an auxiliary core 321, an auxiliary bracket 323, and an end core 322, the auxiliary bracket 323 includes an auxiliary bracket body 3231 and a second branch arm 3232, the second branch arm 3232 is arranged on one side of the auxiliary bracket body 3231 adjacent to the coil bracket 22, the coil bracket 22 is provided with a second slot 222 on the side adjacent to the sub-core 32, the second branch arm 3232 is installed in the second slot 222, the auxiliary bracket body 3231 is sleeved in the end core 322, and the auxiliary core 321 is sleeved in the auxiliary bracket body 3231. In this way, the auxiliary core 321 and the end core 322 can be fixed conveniently, and the structure design is simple and convenient to install.

[0062] The outer peripheral wall of the end core 322 and the inner peripheral wall of the piston shell 1 (the piston upper cover 12 and / or the piston lower cover 13) define an edge axial flow channel Q3, and the auxiliary core 321 is provided with a central auxiliary flow channel Q2 penetrating axially. It can be understood that the auxiliary bracket 323 is used to fix the auxiliary core 321 and the end core 322, and the auxiliary bracket body 3231 is supported between the auxiliary core 321 and the end core 322. For the sub-core 32 adjacent to the piston upper cover 12, the upper end faces of the auxiliary bracket body 3231, the auxiliary core 321, and the end core 322 jointly define an auxiliary radial flow channel Q4 with the piston upper cover 12. The lower end faces of the auxiliary bracket body 3231, the auxiliary core 321, and the end core 322 jointly define a main radial flow channel Q5 with the upper end face of the coil assembly 2.

[0063] Optionally, the first branch arm 232 and the second branch arm 3232 are both a plurality of and are arranged in a circumferential direction of the auxiliary bracket body 3231 to separate the main radial flow channel Q5 into a plurality of main radial sub-flow channels Q51.

[0064] For example, as shown in FIG. 9, the first branch arm 232 is two and is arranged in a radial direction symmetrically, and the second branch arm 3232 is two and is arranged in a radial direction symmetrically. The arrangement forms of the two first branch arms 232 and the two second branch arms 3232 are generally in a “cross” shape. In this way, the main radial flow channel Q5 can be separated into four fan-shaped main radial sub-flow channels Q51, so that the distribution of the magnetorheological fluid flowing through the main radial flow channel Q5 is more uniform, and the contact area between the magnetorheological fluid and the main core 31 and the sub-core 32 can be increased, and the damping force can be improved.

[0065] Correspondingly, the liquid inlet 121 and the liquid outlet 122 can each be provided with a plurality of, the plurality of liquid inlets 121 are arranged in a circumferential direction of the piston upper cover 12, and the plurality of liquid outlets 122 are arranged in a circumferential direction of the piston lower cover 13. For example, the number of the liquid inlets 121 and the liquid outlets 122 can correspond to the plurality of main radial sub-flow channels Q51 one by one.

[0066] In some embodiments, as shown in FIGS. 3-7, the piston assembly further comprises a piston rod 41 and a wire 42, the piston rod 41 is connected with the piston shell 1, the piston rod 41 is provided with an axial wire channel 411, the wire channel 411 is communicated with the installation cavity 14, and the wire 42 is arranged in the wire channel 411 and is electrically connected with the coil component 2. It can be understood that the wire 42 can be hidden in the wire channel 411 of the piston rod 41, so as to avoid the problem of damage of the wire 42 when the piston assembly moves, facilitate to prolong the service life of the magnetorheological damper, and have good reliability.

[0067] As shown in FIG. 2, the piston assembly of the embodiment of the present disclosure can improve the structural strength of the piston rod 41 by arranging the liquid inlet 121 on the piston shell 1 instead of on the piston rod 41, so as to avoid the problem of breakage of the piston rod 41 under a large load.

[0068] Optionally, as shown in FIG. 3, the piston assembly further comprises a sealing filler 43, the sealing filler 43 is arranged in the wire channel 411 and wraps the wire 42, so as to fix and seal the wire 42. The piston assembly further comprises a wear-resistant strip 44, the wear-resistant strip 44 is sleeved on the outer circumferential wall of the piston shell 1. The wear-resistant strip 44 can provide guidance for the movement of the piston shell 1, and improve the wear resistance and sealing performance of the piston assembly.

[0069] Specifically, as shown in FIGS. 3-7, the piston assembly further comprises two auxiliary flow channel end covers 15, both of which are arranged in the installation cavity 14, one auxiliary flow channel end cover 15 is arranged on the piston upper cover 12 and abuts against one auxiliary support 323, and the other auxiliary flow channel end cover 15 is arranged on the piston lower cover 13 and abuts against the other auxiliary support 323.

[0070] As shown in FIGS. 3-6, the connecting position of the piston rod 41 and the piston upper cover 12 is provided with a steel wire retainer 45, so as to fix the piston rod 41 and the piston upper cover 12.

[0071] As shown in FIGS. 12-15, another embodiment of the magnetorheological damper of the present disclosure comprises a piston assembly, a cylinder 51, a vehicle frame connecting piece 52 and a suspension connecting piece 53. The piston assembly is the piston assembly of the embodiment of the present disclosure, and the piston assembly further comprises a piston rod 41, the piston rod 41 is connected with the piston shell 1, the vehicle frame connecting piece 52 is arranged at one end of the cylinder 51 (such as the lower end of the cylinder 51 in FIG. 14), and the cylinder 51 is connected with the vehicle frame connecting piece 52 through a connecting rod 58. The cylinder 51 is filled with a magnetorheological liquid, the piston assembly is slidingly fitted in the cylinder 51, one end of the piston rod 41 extends out of the other end of the cylinder 51 (such as the upper end of the cylinder 51 in FIG. 13) and is connected with the suspension connecting piece 53.

[0072] The technical advantages of the magneto-rheological damper of the embodiment of the present disclosure are the same as those of the piston assembly of the above embodiment, which will not be repeated here.

[0073] As shown in FIGS. 13 and 14, the piston assembly divides the cavity of the cylinder 51 into a restoring cavity 511 and a compression cavity 512. The restoring cavity 511 is arranged at the upper end of the piston shell 1, and the compression cavity 512 is arranged at the lower end of the piston shell 1. Both the restoring cavity 511 and the compression cavity 512 are provided with magneto-rheological liquid, which can flow between the restoring cavity 511 and the compression cavity 512 when the piston rod 41 moves up and down.

[0074] Specifically, as shown in FIG. 13, the restoring cavity 511 of the cylinder 51 is provided with a guide sleeve 55 and an oil seal structure 56. The piston rod 41 passes through the guide sleeve 55, which is used to guide the movement of the piston rod 41. The oil seal structure 56 is arranged at the upper end of the cylinder 51 to prevent liquid leakage.

[0075] As shown in FIG. 14, the cylinder 51 is further provided with an air piston 54, which is slidingly installed at the lower end of the piston shell 1 and defines an air cavity 513 with the cylinder 51. The air cavity 513 is filled with nitrogen gas. As shown in FIG. 14, the lower end of the cylinder 51 is provided with a valve core assembly 57 for inflating the air cavity 513. The cavities in the cylinder 51 are, from top to bottom, the restoring cavity 511, the compression cavity 512, and the air cavity 513.

[0076] It can be understood that the air piston 54 is used to adjust the volume of the magneto-rheological liquid cavity during the movement of the damper, so as to convert the nitrogen gas pressure into hydraulic pressure, provide the restoring force of the piston rod 41, and inhibit the gasification of the oil, so as to ensure that the liquid pressure in the cylinder 51 is always not lower than the emulsification critical value of the magneto-rheological liquid.

[0077] The vehicle of another embodiment of the present disclosure includes the magneto-rheological damper of the embodiment of the present disclosure. It can be understood that the suspension connecting piece 53 of the magneto-rheological damper is hinged to the axle 61 of the vehicle, and the vehicle frame connecting piece 52 of the magneto-rheological damper is elastically connected to the vehicle frame 62 of the vehicle.

[0078] The technical advantages of the vehicle of the embodiment of the present disclosure are the same as those of the piston assembly and the magneto-rheological damper of the above embodiment, which will not be repeated here.

[0079] In the description of the present disclosure, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0080] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0081] In the present disclosure, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0082] In the present disclosure, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0083] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the description herein of various embodiments or examples of the disclosure can be combined with each other, and with different embodiments or examples of the disclosure, to form further embodiments or examples of the disclosure, without departing from the scope of the disclosure.

[0084] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and are not to be construed as limiting the disclosure, and the changes, modifications, replacements, and variations of the above-mentioned embodiments made by those skilled in the art are within the protection scope of the disclosure.

Claims

1. A piston assembly, comprising: a piston shell, wherein an installation cavity is arranged in the piston shell, and a liquid inlet and a liquid outlet are arranged at two axial ends of the piston shell respectively; a coil component, wherein the coil component is coaxially arranged in the installation cavity; a core component, wherein the core component comprises a main core and a sub core, the main core and the sub core are arranged in the installation cavity, the main core is sleeved in the coil component, one end of the sub core is arranged at one end of the main core along the axial direction of the installation cavity, a central main flow channel is arranged in the main core and axially penetrates the main core, a central auxiliary flow channel is arranged in the sub core and axially penetrates the sub core, an outer peripheral wall of the sub core and an inner peripheral wall of the piston shell define an edge axial flow channel, one end of the sub core and the piston shell define an auxiliary radial flow channel, and the other end of the sub core and the main core define a main radial flow channel, the edge axial flow channel and the central auxiliary flow channel are in communication with the auxiliary radial flow channel and the main radial flow channel, the main radial flow channel is in communication with the central main flow channel, and the edge axial flow channel is in communication with the liquid inlet and the liquid outlet.

2. The piston assembly of claim 1, wherein, An axial gap of the auxiliary radial flow channel is smaller than an axial gap of the main radial flow channel.

3. The piston assembly of claim 1 or 2, wherein, The axial gap of the auxiliary radial flow channel is L1, and the axial gap of the main radial flow channel is L2, wherein 0.8mm≤L1≤1.2mm and 2.8mm≤L2≤3.2mm.

4. The piston assembly of claim 1, wherein, The sub core comprises two sub cores, and the two sub cores are arranged at two sides of the main core respectively, each of the sub cores and the piston and the main core define the edge axial flow channel, the auxiliary radial flow channel and the main radial flow channel.

5. The piston assembly of claim 1, wherein, The piston shell comprises a piston upper cover, a sleeve core and a piston lower cover, the piston upper cover and the piston lower cover are arranged at two ends of the sleeve core respectively, and the sleeve core defines the installation cavity together with the piston upper cover and the piston lower cover, the piston upper cover has the liquid inlet, and the piston lower cover has the liquid outlet, one of the sub cores and the piston upper cover and the sleeve core define a group of the edge axial flow channel, the auxiliary radial flow channel and the main radial flow channel which are in communication with the liquid inlet, and the other of the sub cores and the piston lower cover and the sleeve core define another group of the edge axial flow channel, the auxiliary radial flow channel and the main radial flow channel which are in communication with the liquid outlet.

6. The piston assembly of claim 1, wherein, The coil component comprises a coil holder, an electromagnetic coil and a main support, the electromagnetic coil is wound on the coil holder, the main core is arranged in the coil holder, the main support comprises a main holder body and a first support arm, the main holder body is sleeved in the main core, the first support arm is arranged at one side of the main holder body along the axial direction of the installation cavity, the coil holder is provided with a first slot adjacent to one side of the sub core, and the first support arm is arranged in the first slot and abuts against the sub core.

7. The piston assembly of any one of claims 1 or 4-6, wherein, The auxiliary iron core comprises an auxiliary iron core, an auxiliary support and an end iron core, the auxiliary support comprises an auxiliary support body and a second support arm, the second support arm is arranged on one side of the auxiliary support body adjacent to the coil support, the coil support is provided with a second groove on the side adjacent to the auxiliary iron core, the second support arm is installed in the second groove, the auxiliary support body is sleeved in the end iron core, the auxiliary iron core is sleeved in the auxiliary support body, and the outer peripheral wall of the end iron core and the inner peripheral wall of the piston shell define an edge axial flow channel, and the auxiliary iron core is provided with the central auxiliary flow channel penetrating in the axial direction.

8. The piston assembly of claim 6 or 7, wherein, At least one of the first support arm and the second support arm is a plurality of support arms, and the plurality of support arms are arranged in a circumferential direction of the auxiliary support body to divide the main radial flow channel into a plurality of main radial sub-flow channels.

9. The piston assembly of any one of claims 1-8, wherein, The piston assembly further comprises a piston rod and a wire, the piston rod is connected with the piston shell, the piston rod is provided with a wire channel penetrating in the axial direction, the wire channel is communicated with the mounting cavity, and the wire is arranged in the wire channel and is electrically connected with the coil component.

10. The piston assembly of any one of claims 1-9, wherein, The piston assembly further comprises a sealing filler, the sealing filler is arranged in the wire channel and wraps the wire. And / or, the piston assembly further comprises a wear-resistant strip, and the wear-resistant strip is sleeved on the outer peripheral wall of the piston shell.

11. A magnetorheological damper, comprising: a piston assembly, the piston assembly is the piston assembly according to any one of claims 1-10, and the piston assembly further comprises a piston rod, the piston rod is connected with the piston shell; And / or, the piston assembly further comprises a cylinder, a vehicle frame connecting piece and a suspension connecting piece, the vehicle frame connecting piece is arranged at one end of the cylinder, the cylinder is filled with a magnetorheological liquid, the piston assembly is slidingly fitted in the cylinder, and one end of the piston rod protrudes from the other end of the cylinder and is connected with the suspension connecting piece.

12. A vehicle, comprising the magnetorheological damper according to claim 11.

Images