Piston assembly of magnetorheological damper, magnetorheological damper, and vehicle

Abstract

Disclosed in the embodiments of the present disclosure are a piston assembly of a magnetorheological damper, a magnetorheological damper, and a vehicle. The piston assembly comprises a piston rod and a piston; and the piston comprises a housing, a first end iron core, a second end iron core, a main iron core, a coil support, an electromagnetic coil, a first support frame, and a second support frame. According to the piston assembly, the internal space of the housing is effectively utilized, the effective length of a magnetorheological fluid channel is increased by using a radial flow channel and axial flow channel combination method, and when the axial length of the piston is not increased, the number of electromagnetic coils is not increased and the electric power of the whole machine is not increased, the requirement for increasing the damping force is satisfied, that is, under the condition of the same damping force, the axial length of the piston in the embodiment of the present disclosure can be greatly shortened, and the size of the piston is reduced. The magnetorheological fluid channel only penetrates through the piston and the structural strength of the piston rod is not affected. Therefore, the piston assembly in the embodiment of the present disclosure has the advantages of high structural strength, compact structure, and small size.

Description

Piston assembly of magneto-rheological damper, magneto-rheological damper and vehicle TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of dampers, and in particular, the present disclosure relates to a piston assembly of a magneto-rheological damper, a magneto-rheological damper and a vehicle having the magneto-rheological damper. BACKGROUND

[0002] The magneto-rheological damper is widely used in vibration control of robots, automobiles and large civil structures. The magneto-rheological fluid used in the magneto-rheological damper is a new type of intelligent material. Under the action of a magnetic field, the magneto-rheological fluid can complete the conversion of a Newtonian fluid into a solid, and this process is reversible. The magneto-rheological damper mainly includes an electromagnetic coil for generating a magnetic field, a magneto-rheological fluid passage for the flow of the magneto-rheological fluid, and a magnetic conducting core. In the related art, the magneto-rheological fluid passage is usually formed by the electromagnetic coil and the magnetic conducting core, and there is a problem of small damping force. In the related art, in order to increase the damping force, the length of the piston is usually increased, and the number of coils is increased, thereby increasing the length of the magneto-rheological fluid passage in the axial direction of the piston. However, due to the increase in the length of the piston, the magneto-rheological damper has a large volume and occupies a large space. In addition, in the damper in the related art, the lead wire of the electromagnetic coil is complex.

[0003] DISCLOSURE

[0004] The present disclosure aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, an embodiment of the present disclosure proposes a piston assembly of a magneto-rheological damper with increased damping force and small volume.

[0006] An embodiment of the present disclosure also proposes a magneto-rheological damper.

[0007] An embodiment of the present disclosure also proposes a vehicle.

[0008] The piston assembly of the magneto-rheological damper according to the embodiment of the present disclosure comprises: a piston rod having a first end and a second end; and a piston connected to the first end of the piston rod, the piston comprising: a shell, a first end core, a second end core, a main core, a coil support, an electromagnetic coil, a first support frame and a second support frame, the shell is provided with a first magneto-rheological fluid inlet and outlet and a second magneto-rheological fluid inlet and outlet, the first end core is arranged in the shell, a first gap is formed between the outer circumferential surface of the first end core and the inner circumferential surface of the shell, the first gap is communicated with the first magneto-rheological fluid inlet and outlet to form a first axial flow channel, the second end core is arranged in the shell, a second gap is formed between the outer circumferential surface of the second end core and the inner circumferential surface of the shell, the second gap is communicated with the second magneto-rheological fluid inlet and outlet to form a second axial flow channel, the main core has a central through hole, the main core is arranged in the shell and located between the first end core and the second end core, the main core is spaced apart from the first end core and spaced apart from the second end core, the coil support is arranged in the shell, the coil support is sleeved on the main core, the electromagnetic coil is wound on the outer circumferential surface of the coil support, the first support frame is arranged in the shell, the first support frame comprises a plurality of first support legs, the plurality of first support legs are clamped between the first end core and the main core and arranged radially to form a plurality of first radial flow channels communicated with the central through hole between the first end core and the main core, the first radial flow channels are communicated with the first gap, the second support frame is arranged in the shell, the second support frame comprises a plurality of second support legs, the plurality of second support legs are clamped between the second end core and the main core and arranged radially to form a plurality of second radial flow channels communicated with the central through hole between the second end core and the main core, the second radial flow channels are communicated with the second gap.

[0009] The piston assembly of the magneto-rheological damper according to the embodiment of the present disclosure effectively utilizes the internal space of the shell of the piston, adopts the method of combining radial flow channels and axial flow channels to prolong the effective length of the magneto-rheological fluid channel, realizes the requirement of increasing damping force without prolonging the axial length of the piston, without increasing the number of electromagnetic coils and without increasing the power consumption of the whole machine, and it can also be said that under the condition of the same damping force, the axial length of the piston according to the embodiment of the present disclosure can be greatly shortened, and the volume of the piston is reduced. In addition, in the piston assembly according to the embodiment of the present disclosure, the magneto-rheological fluid channel only passes through the piston, without affecting the structural strength of the piston rod. The piston assembly according to the embodiment of the present disclosure has the advantages of high structural strength, compact structure and small volume.

[0010] In some embodiments, the shell comprises: a core sleeve; a first piston cover arranged at a first end of the core sleeve and connected with the piston rod, the first MR fluid inlet and outlet being formed on the first piston cover and facing the first gap in the axial direction of the core sleeve; and a second piston cover arranged at a second end of the core sleeve and connected with the piston rod, the second MR fluid inlet and outlet being formed on the second piston cover and facing the second gap in the axial direction of the core sleeve.

[0011] In some embodiments, the first MR fluid inlet and outlet are a plurality of and arranged at intervals in the circumferential direction of the first piston cover; and / or, the second MR fluid inlet and outlet are a plurality of and arranged at intervals in the circumferential direction of the second piston cover.

[0012] In some embodiments, the first MR fluid inlet and outlet are arc-shaped and extend in the circumferential direction of the first piston cover; and / or, the second MR fluid inlet and outlet are arc-shaped and extend in the circumferential direction of the second piston cover.

[0013] In some embodiments, the first end of the shell is provided with a first connecting hole, the first end core is provided with a second connecting hole, the first connecting hole, the second connecting hole and the through hole in the middle of the main core are aligned along the axial center of the main core, the first end of the piston rod is connected in the first connecting hole and the second connecting hole, and the piston rod is provided with a lead wire through hole extending in the axial direction thereof; the electromagnetic coil comprises a first lead wire and a second lead wire, the first lead wire and the second lead wire are led out from the center through hole of the main core and then led out outward through the lead wire through hole.

[0014] In some embodiments, the lead wire through hole is filled with a filling layer for preventing the first lead wire and the second lead wire from moving.

[0015] In some embodiments, the outer circumferential surface of the coil support is provided with an annular groove, the electromagnetic coil is located in the annular groove, the electromagnetic coil comprises a first lead wire and a second lead wire, the annular groove has a first side wall and a second side wall, the first side wall is provided with a first through slot, the first lead wire passes through the first through slot and is led out outward, and the second side wall is provided with a second through slot, the second lead wire passes through the second through slot and is led out outward.

[0016] In some embodiments, the first through slot is opposite to one of the first legs, the one of the first legs is provided with a first lead channel extending along a length direction of the one of the first legs, the first lead extends through the first lead channel and extends radially inwardly of the main core and then extends axially outwardly of the main core, and the second through slot is opposite to one of the second legs, the one of the second legs is provided with a second lead channel extending along a length direction of the one of the second legs, the second lead extends through the second lead channel and extends radially inwardly of the main core and then extends outwardly of the main core through the central through hole of the main core.

[0017] In some embodiments, the first support frame includes a first support cylinder, the first legs extend radially outwardly of the first support cylinder from the first support cylinder, a portion of the first support cylinder is fitted in the central through hole of the main core, the first support cylinder is provided with a first guide slot extending along an axial direction of the first support cylinder, the second support frame includes a second support cylinder, the second legs extend radially outwardly of the second support cylinder from the second support cylinder, a portion of the second support cylinder is fitted in the central through hole of the main core and abuts against the first support cylinder, the second support cylinder is provided with a second guide slot extending along an axial direction of the second support cylinder, and the first guide slot and the second guide slot are opposite to each other so as to guide the second lead to extend through the central through hole of the main core.

[0018] In some embodiments, the second guide slot is adjacent to and in communication with the second lead channel.

[0019] In some embodiments, the first support frame includes a first support cylinder, a portion of the first support cylinder is fitted in the central through hole of the main core, the first legs are arranged in a circumferential direction of the first support cylinder and connected to an outer circumferential surface of the first support cylinder, and the first support cylinder is provided with a first through slot for connecting the first radial flow channel and the central through hole; and / or, the second support frame includes a second support cylinder, a portion of the second support cylinder is fitted in the central through hole of the main core, the second legs are arranged in a circumferential direction of the second support cylinder and connected to an outer circumferential surface of the second support cylinder, and the second support cylinder is provided with a second through slot for connecting the second radial flow channel and the central through hole.

[0020] In some embodiments, the coil support has opposite first and second end faces in an axial direction of the coil support, the first legs are attached to the first end face, and an outer end face of the first legs is flush with an outer circumferential edge of the first end face; and / or, the second legs are attached to the second end face, and an outer end face of the second legs is flush with an outer circumferential edge of the second end face.

[0021] In some embodiments, a plurality of first clamping grooves are arranged on the first end surface, and the plurality of first legs are correspondingly clamped in the plurality of first clamping grooves; and / or a plurality of second clamping grooves are arranged on the second end surface, and the plurality of second legs are correspondingly clamped in the plurality of second clamping grooves.

[0022] In some embodiments, an annular clamping groove is arranged on the outer circumferential surface of the shell, and an abrasion-reducing member is arranged in the annular clamping groove, and the outer circumferential surface of the abrasion-reducing member is higher than the outer circumferential surface of the shell.

[0023] The magneto-rheological damper of the embodiments of the present disclosure comprises: a cylinder having a first end and a second end; a piston assembly, which is the piston assembly of the magneto-rheological damper of any of the above embodiments, and the piston of the piston assembly is movably arranged in the inner cavity of the cylinder along the axial direction of the cylinder, and the second end of the piston rod extends from the second end of the cylinder.

[0024] The piston assembly in the magneto-rheological damper of the embodiments of the present disclosure adopts a method of combining radial flow channels and axial flow channels to extend the effective length of the magneto-rheological fluid channel, thereby increasing the damping force of the magneto-rheological damper without extending the axial length of the piston, increasing the number of electromagnetic coils, or increasing the power consumption of the whole machine.

[0025] In some embodiments, the magneto-rheological damper further comprises a gas piston movably arranged in the inner cavity of the cylinder along the axial direction of the cylinder, so as to divide the inner cavity of the cylinder into a magneto-rheological fluid chamber on the first side of the gas piston and a gas chamber on the second side of the gas piston, the cylinder is provided with a valve core opening in communication with the gas chamber, the valve core opening is provided with a valve core assembly, and the piston of the piston assembly is movably arranged in the magneto-rheological fluid chamber.

[0026] In some embodiments, the magneto-rheological damper further comprises a first connecting member connected to the second end of the piston rod and a second connecting member connected to the first end of the cylinder.

[0027] In some embodiments, the magneto-rheological damper further comprises a buffer block located between the first connecting member and the second end of the cylinder and arranged on one of the first connecting member, the piston rod, and the second end of the cylinder.

[0028] The vehicle of the embodiments of the present disclosure comprises: a vehicle frame; a suspension; a magneto-rheological damper, which is the magneto-rheological damper of any of the above embodiments, and the magneto-rheological damper is arranged between the vehicle frame and the suspension. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 is an exploded view of a piston assembly of a magneto-rheological damper according to an embodiment of the present disclosure.

[0030] Fig. 2 is a perspective view of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure.

[0031] Fig. 3 is an end view of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure.

[0032] Fig. 4 is a sectional view along line A-A in Fig. 3.

[0033] Fig. 5 is a partial enlarged view of Fig. 4.

[0034] Fig. 6 is a sectional view along line B-B in Fig. 3.

[0035] Fig. 7 is a partial enlarged view of Fig. 6.

[0036] Fig. 8 is a schematic view of a magnetic field distribution within the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure.

[0037] Fig. 9 is a schematic view of a coil support of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure.

[0038] Fig. 10 is an assembly schematic view of the coil support and the electromagnetic coil of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure.

[0039] Fig. 11 is an assembly schematic view of the coil support, the electromagnetic coil and the main core of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure.

[0040] Fig. 12 is an assembly schematic view of the coil support, the electromagnetic coil, the main core, the first support frame and the second support frame of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure.

[0041] Fig. 13 is an assembly schematic view of the coil support, the electromagnetic coil, the main core, the first support frame and the second support frame of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure, from another perspective.

[0042] Fig. 14 is a perspective view of a piston of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure.

[0043] Fig. 15 is a perspective view of the piston of the piston assembly of the magneto-rheological damper according to an embodiment of the present disclosure, from another perspective.

[0044] Fig. 16 is a perspective view of the magneto-rheological damper according to an embodiment of the present disclosure.

[0045] Fig. 17 is an exploded view of the magneto-rheological damper according to an embodiment of the present disclosure.

[0046] Fig. 18 is a sectional view of the magneto-rheological damper according to an embodiment of the present disclosure.

[0047] FIGS. 19A-19E show the operation of a magnetorheological damper according to an embodiment of the present disclosure.

[0048] FIG. 20 is a partial schematic view of a vehicle according to an embodiment of the present disclosure.

[0049] FIG. 21 is a partial plan view of a vehicle according to an embodiment of the present disclosure.

[0050] Reference signs: piston assembly 100, piston rod 110, lead wire perforation 111, filling layer 112, large-diameter section 113, small-diameter section 114, piston 120, first axial flow passage 1201, second axial flow passage 1202, housing 121, first magnetorheological fluid inlet and outlet 1211, second magnetorheological fluid inlet and outlet 1212, iron core sleeve 1213, first piston cover 1214, second piston cover 1215, first connecting hole 1216, wear-reducing member 1217, first end iron core 122, first gap 1221, second connecting hole 1222, second end iron core 123, second gap 1231, main iron core 124, central through hole 1241, coil support 125, annular recess 1251, first side wall 1252, second side wall 1253, first through slot 1254, second through slot 1255, first end face 1256, second end face 1257, first clamping slot 1258, second clamping slot 1259, electromagnetic coil 126, first lead wire 1261, second lead wire 1262, first support frame 127, first leg 1271, first radial flow passage 1272, first lead wire passage 1273, first support cylinder 1274, first guide slot 1275, first through slot 1276, second support frame 128, second leg 1281, second radial flow passage 1282, second lead wire passage 1283, second support cylinder 1284, second guide slot 1285, second through slot 1286, magnetorheological damper 200, cylinder 210, magnetorheological fluid cavity 211, first cavity 2111, second cavity 2112, gas cavity 212, valve core opening 213, valve core assembly 214, gas piston 220, first connecting member 230, second connecting member 240, buffer block 250, guide cover 260, vehicle 300, vehicle frame 310, suspension 320. DETAILED DESCRIPTION

[0051] Embodiments of the present disclosure are described in detail below with reference to the attached drawing figures, wherein the embodiments described are examples of implementations of the present disclosure. The embodiments described below are not intended to be exhaustive or to be limiting of the disclosure. Any additional or alternative features described below are considered to be within the scope of the present disclosure.

[0052] As shown in FIGS. 1-15, the piston assembly 100 of the magnetorheological damper according to an embodiment of the present disclosure includes a piston rod 110 and a piston 120, wherein the piston rod 110 has opposite first and second ends in its axial direction, and the piston 120 is connected to the first end of the piston rod 110.

[0053] The piston 120 comprises a housing 121, a first end core 122, a second end core 123, a main core 124, a coil support 125, an electromagnetic coil 126, a first support frame 127 and a second support frame 128, wherein the first end core 122, the second end core 123, the main core 124, the coil support 125, the electromagnetic coil 126, the first support frame 127 and the second support frame are all arranged in the housing 121.

[0054] The housing 121 is provided with a first MR fluid inlet and outlet 1211 and a second MR fluid inlet and outlet 1212 for the MR fluid to enter and exit, i.e. the MR fluid can enter the housing 121 through the first MR fluid inlet and outlet 1211 and the second MR fluid inlet and outlet 1212, and can also exit from the housing through the first MR fluid inlet and outlet 1211 and the second MR fluid inlet and outlet 1212.

[0055] As shown in FIG. 5, the outer circumferential surface of the first end core 122 and the inner circumferential surface of the housing 121 have a first gap 1221, and the first gap 1221 is communicated with the first MR fluid inlet and outlet 1211 to form a first axial flow channel 1201. The outer circumferential surface of the second end core 123 and the inner circumferential surface of the housing 121 have a second gap 1231, and the second gap 1231 is communicated with the second MR fluid inlet and outlet 1212 to form a second axial flow channel 1202. It can be understood that the first gap 1221 and the second gap 1231 are both annular gaps. The first axial flow channel 1201 and the second axial flow channel 1202 both extend along the axial direction of the piston 120.

[0056] The coil support 125 is sleeved on the main core 124, and the electromagnetic coil 126 is wound on the outer circumferential surface of the coil support 125. The main core 124 has a central through hole 1241, and the main core 124 is located between the first end core 122 and the second end core 123 in the axial direction. The main core 124 is spaced apart from the first end core 122, and the main core 124 is spaced apart from the second end core 123, i.e. the main core 124 and the first end core 122 have a first gap, and the main core 124 and the second end core 123 have a second gap.

[0057] The first support frame 127 comprises a plurality of first legs 1271 clamped between the first end core 122 and the main core 124 and arranged radially to form a plurality of first radial flow channels 1272 between the first end core 122 and the main core 124, the first radial flow channels 1272 being in communication with the central through hole 1241 and the first radial flow channels 1272 being in communication with the first gap 1221. In other words, the plurality of first legs 1271 are located in the first interval, dividing the first interval into a plurality of first radial flow channels 1272 extending along the radial direction of the main core 124. The inner end of the first radial flow channel 1272 (the end close to the central through hole 1241) is in communication with the central through hole 1241, and the outer end of the first radial flow channel 1272 (the end close to the inner circumferential surface of the shell 121) is in communication with the first gap 1221, i.e. in communication with the first axial flow channel 1201.

[0058] The second support frame 128 comprises a plurality of second legs 1281 clamped between the second end core 123 and the main core 124 and arranged radially to form a plurality of second radial flow channels 1282 between the second end core 123 and the main core 124, the second radial flow channels 1282 being in communication with the central through hole 1241 and the second radial flow channels 1282 being in communication with the second gap 1231. In other words, the plurality of second legs 1281 are located in the second interval, dividing the second interval into a plurality of second radial flow channels 1282 extending along the radial direction of the main core 124, the inner end of the second radial flow channel 1282 (the end close to the central through hole 1241) is in communication with the central through hole 1241, and the outer end of the second radial flow channel 1282 (the end close to the inner circumferential surface of the shell 121) is in communication with the second gap 1231, i.e. in communication with the second axial flow channel 1202.

[0059] Thus, the first axial flow channel 1201-the first radial flow channel 1272-the central through hole 1241-the second radial flow channel 1282-the second axial flow channel 1202 are sequentially communicated, forming a magnetorheological fluid flow channel of the piston 120.

[0060] The magnetorheological fluid will produce a condensation effect under the action of the magnetic field, so that the viscosity of the magnetorheological fluid increases, the resistance through the magnetorheological fluid flow channel increases, thereby producing a damping effect. By adjusting the size of the current to change the magnetic field strength of the electromagnetic coil 126, and then adjusting the viscosity of the magnetorheological fluid in the magnetorheological fluid flow channel, the adjustment of the damping force is realized. As shown in FIG. 8, the magnetic field distribution in the piston assembly 100, the electromagnetic coil 126 generates a magnetic field under the action of electricity, magnetizing the main core 124, the first end core 122, the second end core 123 and the shell 121, and the main core 124, the first end core 122, the second end core 123 and the shell 121 magnetized in the magnetorheological fluid flow channel to generate a magnetic field.

[0061] When the magnetorheological fluid enters the first magnetorheological fluid inlet and outlet 1211 from the first axial flow channel 1201, the magnetorheological fluid sequentially passes through the first axial flow channel 1201-the first radial flow channel 1272-the center through hole 1241-the second radial flow channel 1282-the second axial flow channel 1202 and flows out from the second magnetorheological fluid inlet and outlet 1212. When the magnetorheological fluid enters the second axial flow channel 1202 from the second magnetorheological fluid inlet and outlet 1212, the magnetorheological fluid sequentially passes through the second axial flow channel 1202-the second radial flow channel 1282-the center through hole 1241-the first radial flow channel 1272-the first axial flow channel 1201 and flows out from the first magnetorheological fluid inlet and outlet 1211.

[0062] The piston assembly of the magnetorheological damper in the embodiment of the present disclosure effectively utilizes the internal space of the shell of the piston, adopts the method of combining the radial flow channel and the axial flow channel to extend the effective length of the magnetorheological fluid channel, realizes the requirement of increasing the damping force without extending the axial length of the piston, without increasing the number of electromagnetic coils and without increasing the power consumption of the whole machine, and it can also be said that under the condition of the same damping force, the axial length of the piston in the embodiment of the present disclosure can be greatly shortened, and the volume of the piston is reduced. In addition, in the piston assembly of the embodiment of the present disclosure, the magnetorheological fluid channel is only provided in the piston, without affecting the structural strength of the piston rod.

[0063] Therefore, the piston assembly of the embodiment of the present disclosure has the advantages of high structural strength, compact structure and small volume.

[0064] In some embodiments, as shown in FIGS. 1-15, the shell 121 includes a core sleeve 1213, a first piston cover 1214 and a second piston cover 1215, the first piston cover 1214 is arranged at the first end (for example, the left end in FIGS. 4-7) of the core sleeve 1213 and connected with the piston rod 110, the first magnetorheological fluid inlet and outlet 1211 is arranged on the first piston cover 1214 and opposite to the first gap 1221 in the axial direction of the core sleeve 1213, the first magnetorheological fluid inlet and outlet 1211 and the first gap 1221 form the first axial flow channel 1201, and the magnetorheological fluid flows in the axial direction of the shell 121 in the first axial flow channel 1201.

[0065] The second piston cover 1215 is arranged at the second end (for example, the right end in FIGS. 4-7) of the core sleeve 1213 and connected with the piston rod 110, the second magnetorheological fluid inlet and outlet 1212 is arranged on the second piston cover 1215 and opposite to the second gap 1231 in the axial direction of the core sleeve 1213, the second magnetorheological fluid inlet and outlet 1212 and the second gap 1231 form the second axial flow channel 1202, and the magnetorheological fluid flows in the axial direction of the shell 121 in the second axial flow channel 1202.

[0066] It should be noted that the iron core sleeve 1213 is a magnetic conductive material, and the first piston cover 1214 and the second piston cover 1215 are non-magnetic conductive materials and do not participate in magnetization to form a magnetic field.

[0067] In some specific examples, the first MR fluid inlet and outlet 1211 is a plurality (for example, the number of the first MR fluid inlet and outlet 1211 in the example shown in FIGS. 1-15 is four), and the plurality of first MR fluid inlets and outlets 1211 are arranged along the circumference of the first piston cover 1214 and are all opposite to the annular first gap 1221 in the axial direction of the iron core sleeve 1213. The MR fluid can enter the first gap 1221 from the plurality of first MR fluid inlets and outlets 1211 and then be dispersed into the plurality of first radial flow channels 1272, or the MR fluid in the first gap 1221 is dispersedly discharged from the plurality of first MR fluid inlets and outlets 1211 to the piston 120.

[0068] The second MR fluid inlet and outlet 1212 is a plurality (for example, the number of the first MR fluid inlet and outlet 1211 in the example shown in FIGS. 1-15 is four), and the plurality of second MR fluid inlets and outlets 1212 are arranged along the circumference of the second piston cover 1215 and are all opposite to the annular first gap 1221 in the axial direction of the iron core sleeve 1213. The MR fluid can enter the second gap 1231 from the plurality of second MR fluid inlets and outlets 1212 and then be dispersed into the plurality of second radial flow channels 1282, or the MR fluid in the second gap 1231 is dispersedly discharged from the plurality of second MR fluid inlets and outlets 1212 to the piston 120.

[0069] Further, as shown in FIGS. 14 and 15, the first MR fluid inlet and outlet 1211 is an arc shape extending along the circumference of the first piston cover 1214 to adapt to the annular first gap 1221, and the cross section of the arc-shaped first MR fluid inlet and outlet 1211 is large, so that the MR fluid can flow smoothly. The second MR fluid inlet and outlet 1212 is an arc shape extending along the circumference of the second piston cover 1215 to adapt to the annular second gap 1231, and the cross section of the arc-shaped second MR fluid inlet and outlet 1212 is large, so that the MR fluid can flow smoothly.

[0070] Optionally, the plurality of first MR fluid inlets and outlets 1211 correspond to the plurality of first radial flow channels 1272 in the axial direction of the housing 121, and the plurality of second MR fluid inlets and outlets 1212 correspond to the plurality of second radial flow channels 1282 in the axial direction of the housing 121, so that the MR fluid flows more smoothly. For example, as shown in FIGS. 1-15, the number of the first MR fluid inlets and outlets 1211, the first radial flow channels 1272, the second MR fluid inlets and outlets 1212, and the second radial flow channels 1282 is four, the four first MR fluid inlets and outlets 1211 correspond to the four first radial flow channels 1272 in the axial direction of the housing 121, and the four second MR fluid inlets and outlets 1212 correspond to the four second radial flow channels 1282 in the axial direction of the housing 121.

[0071] In some embodiments, as shown in FIGS. 4 and 5, the first end of the housing 121 is provided with a first connecting hole 1216 (for example, in FIG. 5, the first connecting hole 1216 is provided on the first piston cover 1214 of the housing 121), the first end core 122 is provided with a second connecting hole 1222, the first connecting hole 1216, the second connecting hole 1222, and the central through hole 1241 of the main core 124 are aligned along the axial center of the main core 124, and the first end of the piston rod 110 is connected in the first connecting hole 1216 and the second connecting hole 1222.

[0072] Specifically, as shown in FIG. 5, the diameter of the first connecting hole 1216 is larger than the diameter of the second connecting hole 1222, the first end of the piston rod 110 has a large-diameter section 113 and a small-diameter section 114, the large-diameter section 113 of the piston rod 110 is fitted in the first connecting hole 1216, and the small-diameter section 114 of the piston rod 110 is fitted in the second connecting hole 1222. Optionally, the large-diameter section 113 is threadedly connected with the first connecting hole 1216, and the small-diameter section 114 is threadedly connected with the second connecting hole 1222.

[0073] In some embodiments, as shown in FIGS. 9-13, the outer circumferential surface of the coil support 125 is provided with an annular groove 1251, and the coil body of the electromagnetic coil 126 is located in the annular groove 1251, which is used to limit the position of the coil body of the electromagnetic coil 126 and prevent it from deviating. The electromagnetic coil 126 includes a first lead wire 1261 and a second lead wire 1262, and the first lead wire 1261 and the second lead wire 1262 extend from the coil body of the electromagnetic coil 126 wound on the coil support 125. The first lead wire 1261 and the second lead wire 1262 are used to be connected with an external power supply and be electrified, so as to adjust the size of the current in the electromagnetic coil 126 to change the magnetic field strength.

[0074] Specifically, as shown in FIGS. 9-13, the annular groove 1251 has a first sidewall 1252 and a second sidewall 1253, the first sidewall 1252 is provided with a first through slot 1254 therethrough, and the second sidewall 1253 is provided with a second through slot 1255 therethrough. The first lead 1261 of the electromagnetic coil 126 extends outward through the first through slot 1254, and the second lead 1262 extends outward through the second through slot 1255.

[0075] As shown in FIGS. 5 and 12, the first through slot 1254 is opposite one of the first legs 1271 of the first support frame 127, the one first leg 1271 is provided with a first lead passage 1273 extending along the length direction thereof, and the first lead 1261 extends inward along the radial direction of the main core 124 through the first lead passage 1273 after extending outward through the first through slot 1254, and then extends outward after extending to the center through hole 1241 of the main core 124.

[0076] As an example, as shown in FIGS. 1-15, the first lead passage 1273 is a through slot provided on the side of the one first leg 1271 facing the main core 124. Alternatively, the first lead passage 1273 is a through hole provided in the one first leg 1271.

[0077] As shown in FIGS. 5 and 13, the second through slot 1255 is opposite one of the second legs 1281 of the second support frame 128, the one second leg 1281 is provided with a second lead passage 1283 extending along the length direction thereof, and the second lead 1262 extends inward along the radial direction of the main core 124 through the second lead passage 1283 after extending outward through the second through slot 1255, and then extends outward after extending through the center through hole 1241 of the main core 124.

[0078] As an example, as shown in FIGS. 1-15, the second lead passage 1283 is a through slot provided on the side of the one second leg 1281 facing the main core 124. Alternatively, the second lead passage 1283 is a through hole provided in the one second leg 1281.

[0079] Further, as shown in FIGS. 1-8, the piston rod 110 is provided with a lead hole 111 extending along the axial direction thereof, and the lead hole 111 is opposite the center through hole 1241 of the main core 124 in the axial direction. The first lead 1261 and the second lead 1262 extend outward through the lead hole 111 after extending out of the center through hole 1241 of the main core 124. For example, as shown in FIG. 5, the first lead 1261 and the second lead 1262 extend leftward along the lead hole 111.

[0080] As shown in FIG. 4 and FIG. 5, in order to prevent the first lead wire 1261 and the second lead wire 1262 from moving, the lead wire through hole 111 is filled with a filling layer 112. The filling layer 112 fills the gap between the first lead wire 1261 and the second lead wire 1262 and the hole wall surface of the lead wire through hole 111, preventing the first lead wire 1261 and the second lead wire 1262 from colliding with each other or the hole wall surface of the lead wire through hole 111 and causing damage to the lead wire, affecting the current conduction. The filling layer 112 also plays a sealing role.

[0081] Optionally, the filling layer 112 is a sponge material or other filling material that can play a buffering and sealing role.

[0082] In some embodiments, as shown in FIG. 1-FIG. 15, the first support frame 127 includes a first support cylinder 1274, and a plurality of first support legs 1271 are arranged along the circumference of the first support cylinder 1274 and connected to the outer circumferential surface of the first support cylinder 1274. A portion of the first support cylinder 1274 is fitted into the central through hole 1241 of the main iron core 124 to assemble the first support frame 127 with the main iron core 124.

[0083] The second support frame 128 includes a second support cylinder 1284, and a plurality of second support legs 1281 are arranged along the circumference of the second support cylinder 1284 and connected to the outer circumferential surface of the second support cylinder 1284. A portion of the second support cylinder 1284 is fitted into the central through hole 1241 of the main iron core 124 to assemble the second support frame 128 with the main iron core 124.

[0084] The first support cylinder 1274 and the second support cylinder 1284 abut in the central through hole 1241 to position the relative positions of the first support frame 127 and the second support frame 128.

[0085] In the example shown in FIG. 1-FIG. 15, the plurality of first support legs 1271 extend radially outward from the first support cylinder 1274 along the radial direction of the first support cylinder 1274, and between any two adjacent first support legs 1271, a first radial flow channel 1272 in the shape of a sector is formed in the circumferential direction of the first support cylinder 1274. The first support cylinder 1274 is provided with a plurality of first through grooves 1276 penetrating through the cylinder wall thereof, and the plurality of first through grooves 1276 correspond one-to-one to the plurality of first radial flow channels 1272. The first through groove 1276 is used to connect the corresponding first radial flow channel 1272 and the central through hole 1241, and the magnetorheological fluid can flow from the first radial flow channel 1272 into the central through hole 1241 through the first through groove 1276, or flow from the central through hole 1241 into the first radial flow channel 1272 through the first through groove 1276.

[0086] The second support cylinder 1284 is provided with a plurality of second through grooves 1286 penetrating the wall of the second support cylinder 1284, and the second through grooves 1286 correspond to the plurality of second radial flow channels 1282 one by one. The second through grooves 1286 are used to connect the corresponding second radial flow channels 1282 and the central through hole 1241, so that the magnetorheological fluid can flow from the second radial flow channels 1282 into the central through hole 1241 through the second through grooves 1286, or flow from the central through hole 1241 into the second radial flow channels 1282 through the second through grooves 1286.

[0087] As shown in FIG. 1 and FIG. 5, the first support cylinder 1274 is provided with a first guide groove 1275 extending in the axial direction thereof. The second support cylinder 1284 is provided with a second guide groove 1285 extending in the axial direction thereof. The first guide groove 1275 and the second guide groove 1285 are opposite in the axial direction of the central through hole 1241, and are used to guide the second lead wire 1262 of the electromagnetic coil 126 to pass through the central through hole 1241 of the main iron core 124, and then the second lead wire 1262 and the first lead wire 1261 are jointly led outwards through the lead wire perforation 111 in the piston rod 110. In other words, the wire segment of the second lead wire 1262 located in the central through hole 1241 is matched in the first guide groove 1275 and the second guide groove 1285, and the arrangement of the first guide groove 1275 and the second guide groove 1285 avoids the second lead wire 1262 in the central through hole 1241 in a floating state to affect the flow of the magnetorheological fluid, and improves the assembly stability of the internal components of the piston assembly 100.

[0088] In order to lead the second lead wire 1262 out more smoothly, as shown in FIG. 5, the second guide groove 1285 provided on the second support cylinder 1284 is adjacent to and communicates with the second lead wire passage 1283. After the second lead wire 1262 extends along the second lead wire passage 1283, it extends into the second guide groove 1285 by a short distance, which reduces the length of the exposed wire segment of the second lead wire 1262, and further improves the assembly stability of the internal components of the piston assembly 100.

[0089] In some embodiments, as shown in FIGS. 9-13, the coil support 125 has opposite first and second end faces 1256 and 1257 in its axial direction. The first legs 1271 of the first support frame 127 are flush with the first end face 1256, and the outer end faces of the first legs 1271 are flush with the outer periphery of the first end face 1256, so as to maximize the length of the first radial flow channel 1272 defined by the first legs 1271. The second legs 1281 of the second support frame 128 are flush with the second end face 1257, and the outer end faces of the second legs 1281 are flush with the outer periphery of the second end face 1257, so as to maximize the length of the second radial flow channel 1282 defined by the second legs 1281.

[0090] As an example, as shown in FIGS. 9-13, a plurality of first clamping slots 1258 are provided on the first end face 1256, and the first legs 1271 are correspondingly clamped in the first clamping slots 1258, so as to assemble the first support frame 127 with the coil support 125 and improve the assembly stability therebetween. A plurality of second clamping slots 1259 are provided on the second end face 1257, and the second legs 1281 are correspondingly clamped in the second clamping slots 1259, so as to assemble the second support frame 128 with the coil support 125 and improve the assembly stability therebetween.

[0091] Alternatively, other assembly manners can be adopted between the first support frame 127 and the coil support 125, and between the second support frame 128 and the coil support 125, which are not limited in the present disclosure.

[0092] In some embodiments, as shown in FIGS. 1-18, an annular clamping slot is provided on the outer periphery of the housing 121, and an anti-friction member 1217 is arranged in the annular clamping slot, and the outer periphery of the anti-friction member 1217 is higher than the outer periphery of the housing 121. The anti-friction member 1217 is arranged between the piston 120 and the inner wall of the cylinder barrel 210, and functions as guiding, reducing friction, and sealing.

[0093] When assembling the piston assembly 100 of the present disclosure, the electromagnetic coil 126 can be first mounted on the coil support 125, and the first and second lead wires 1261 are drawn out from the annular groove 1251 of the coil support 125. Then, the main iron core 124, the first support frame 127, and the second support frame 128 are sequentially mounted, and the first support cylinder 1274 of the first support frame 127 abuts against the second support cylinder 1284 of the second support frame 128.

[0094] The first lead wire 1261 extends along the first lead wire passage 1273 of the first support frame 127, and the second lead wire 1262 extends along the second lead wire passage 1274 of the second support frame 128. Moreover, the second lead wire 1262 passes through the central through hole 1241 of the main core 124 along the second guide groove 1285 of the second support cylinder 1284 and the second guide groove 1285 of the first support cylinder 1274.

[0095] The first end core 122 and the second end core 123 are installed so that the first lead wire 1261 and the second lead wire 1262 extend out of the second connecting hole 1222 of the first end core 122. The core sleeve 1213, the first piston cover 1214 and the second piston cover 1215 are installed so that the first lead wire 1261 and the second lead wire 1262 extend out of the first connecting hole 1216 of the first piston cover 1214.

[0096] The piston rod 110 is connected to the piston 120 so that the first lead wire 1261 and the second lead wire 1262 extend outwards along the lead wire through hole 111 of the piston rod 110. The wear-reducing member 1217 is installed on the outside of the housing 121.

[0097] The magnetorheological damper 200 according to the embodiments of the present disclosure is described below with reference to FIGS. 16-19. The magnetorheological damper 200 includes a cylinder 210 and a piston assembly, wherein the piston assembly is the piston assembly 100 described above.

[0098] The cylinder 210 has a first end (e.g., the right end in FIG. 18) and a second end (e.g., the left end in FIG. 18). The piston 120 of the piston assembly 100 is movably arranged in the inner cavity of the cylinder 210 along the axial direction of the cylinder 210, the first end (e.g., the right end in FIG. 18) of the piston rod 110 is connected to the piston 120, and the second end (e.g., the left end in FIG. 18) of the piston rod 110 extends out of the second end (e.g., the left end in FIG. 18) of the cylinder 210.

[0099] The piston assembly in the magnetorheological damper according to the embodiments of the present disclosure uses the method of combining radial flow channels and axial flow channels to extend the effective length of the magnetorheological fluid passage, increases the damping force of the magnetorheological damper without extending the axial length of the piston, without increasing the number of electromagnetic coils, and without increasing the power consumption of the entire machine.

[0100] In some embodiments, as shown in FIGS. 16-19, the magneto-rheological damper 200 further comprises an air piston 220 movably arranged in the inner cavity of the cylinder 210 along the axial direction of the cylinder 210 to divide the inner cavity of the cylinder 210 into a magneto-rheological fluid cavity 211 on the first side (e.g. the left side in FIG. 18) of the air piston 220 and an air cavity 212 on the second side (e.g. the right side in FIG. 18) of the air piston 220. The air cavity 212 can be filled with nitrogen gas. The cylinder 210 is provided with an air valve core opening 213 in communication with the air cavity 212, and the air valve core opening 213 is provided with an air valve core assembly 214 for controlling the air charging of the air cavity 212. The piston 120 of the piston assembly 100 is movably arranged in the magneto-rheological fluid cavity 211.

[0101] The air piston 220 separates the magneto-rheological fluid cavity 211 and the air cavity 212. During the operation of the magneto-rheological damper 200, the air piston 220 moves in the cylinder 210, and the volume ratio of the magneto-rheological fluid cavity 211 and the air cavity 212 changes, so that the gas pressure in the air cavity 212 can be converted into hydraulic pressure to provide a restoring force for the piston rod 110 of the piston assembly 100 and ensure that the pressure of the magneto-rheological fluid in the cylinder 210 is always higher than the critical value of gasification, thereby inhibiting the gasification of the oil.

[0102] In some embodiments, as shown in FIGS. 16-18, the magneto-rheological damper 200 further comprises a first connecting member 230 connected to the second end of the piston rod 110 for connecting with a first shock absorber and a second connecting member 240 connected to the first end of the cylinder 210 for connecting with a second shock absorber. The magneto-rheological damper 200 acts between the first shock absorber and the second shock absorber to consume impact energy by using the flow damping of the magneto-rheological fluid, thereby achieving damping shock absorption.

[0103] Optionally, the first connecting member 230 is a suspension connecting member, and the first shock absorber is a suspension of a vehicle, and the suspension connecting member is used to connect with the suspension of the vehicle.

[0104] Optionally, the second connecting member 240 is a frame connecting member, and the second shock absorber is a frame of a vehicle, and the frame connecting member is used to connect with the frame of the vehicle.

[0105] In some embodiments, the magneto-rheological damper 200 further comprises a buffer block 250 arranged between the first connecting member 230 and the second end of the cylinder 210 and arranged on one of the first connecting member 230, the piston rod 110 and the second end of the cylinder 210. The buffer block 250 is used to slow down the impact and limit the position when the magneto-rheological damper 200 is compressed to the limit position, so as to avoid direct collision between the first connecting member 230 and the second end of the cylinder 210, thereby avoiding damage to the components.

[0106] As shown in Figs. 16-18, the bumper block 250 is sleeved on the piston rod 110 and connected with the first connecting member 230. When the magnetorheological damper 200 is compressed, the first connecting member 230 moves towards the second end of the cylinder 210, and the bumper block 250 contacts the second end of the cylinder 210 to play a buffering role.

[0107] Optionally, the bumper block 250 can also be sleeved on the piston rod 110 and connected with the second end of the cylinder 210.

[0108] As shown in Figs. 16-18, the magnetorheological damper 200 further comprises a guide cover 260 arranged at the second end of the cylinder 210, the piston rod 110 extends outward through a central through hole of the guide cover 260, and the piston rod 110 is movably sealed with the guide cover 260. The guide cover 260 provides a guide for the axial movement of the piston rod 110, and seals the second end of the cylinder 210.

[0109] As shown in Figs. 20 and 21, the vehicle 300 of the embodiment of the present disclosure comprises a vehicle frame 310, a suspension 320, and a magnetorheological damper, which is the magnetorheological damper 200 in any of the above embodiments, and is arranged between the vehicle frame 310 and the suspension 320 to play a damping role.

[0110] When the vehicle 300 passes through a bumpy road, the road impact causes the suspension 320 to jump constantly, thereby driving the piston rod 110 of the magnetorheological damper 200 to extend and retract relative to the cylinder 210. In this process, the magnetorheological fluid in the magnetorheological fluid cavity 211 of the cylinder 210 repeatedly flows through the magnetorheological fluid flow channel in the piston 120, and the damping force generated by the magnetorheological fluid constantly consumes the impact and jumping, so that the vehicle 300 remains stable.

[0111] The compression and recovery process of the magnetorheological damper 200 of the embodiment of the present disclosure will be described in detail below with reference to Figs. 19A-19E, and Figs. 20 and 21.

[0112] As shown in Figs. 20 and 21, the first connecting member 230 (suspension connecting member) of the magnetorheological damper 200 is hinged with a lifting lug on the suspension 320, and the second connecting member 240 (vehicle frame connecting member) of the magnetorheological damper 200 is connected with the vehicle frame 310.

[0113] As shown in Fig. 19A, the magnetorheological damper 200 is in a fully recovered state, at which time the piston rod 110 is in a longest extended state, the piston 120 is located at the leftmost end of the magnetorheological fluid cavity 211, and the volume of the gas cavity chamber 212 is in a maximum state.

[0114] As shown in FIG. 19B, when the vehicle 300 jolts, the piston rod 110 is compressed and pushes the piston 120 to the right, and the portion of the magnetorheological fluid cavity 211 on the left side of the piston 120 is the first chamber 2111, and the portion on the right side of the piston 120 is the second chamber 2112. During the movement of the piston 120 to the right, the magnetorheological fluid in the second chamber 2112 enters the piston 120 from the second magnetorheological fluid inlet and outlet 1212, and then flows out from the first magnetorheological fluid inlet and outlet 1211 in sequence through the first axial flow channel 1201-the first radial flow channel 1272-the central through hole 1241-the second radial flow channel 1282-the second axial flow channel 1202, and flows into the first chamber 2111. At the same time, the air piston 220 moves to the right to compress the air cavity 212, the volume of the air cavity 212 decreases, and the volume of the magnetorheological fluid cavity 211 increases.

[0115] As shown in FIG. 19C, the piston rod 110 is compressed to the limit position, and the buffer block 250 is in contact with the guide cover 260. At this time, most of the magnetorheological fluid is in the first chamber 2111, and the air piston 220 is also at the maximum right moving point, and the air cavity 212 is in the maximum compression state.

[0116] As shown in FIG. 19D, the force acting on the piston rod 110 decreases or disappears, and under the action of the high-pressure nitrogen gas in the air cavity 212, the air piston 220 gradually moves to the left, the volume of the air cavity 212 increases, and the volume of the magnetorheological fluid cavity 211 decreases, so that the piston rod 110 gradually moves to the left and extends out of the cylinder 210, and the piston rod 110 drives the piston 120 to gradually move to the left. During this process, the magnetorheological fluid in the first chamber 2111 enters the piston 120 from the first magnetorheological fluid inlet and outlet 1211, and then flows out from the second magnetorheological fluid inlet and outlet 1212 in sequence through the second axial flow channel 1202-the second radial flow channel 1282-the central through hole 1241-the first radial flow channel 1272-the first axial flow channel 1201, and flows into the second chamber 2112, until the piston rod 110 and the piston 120 completely recover to the initial state (as shown in FIG. 19E).

[0117] In the description of the present disclosure, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0118] In addition, the terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply relative importance or a quantity of the indicated elements. Thus, a feature defined with "first", "second", etc. can include at least one of the features, either explicitly or implicitly. In the description of the disclosure, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0119] In the 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 integrated; 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 disclosure can be understood according to the specific circumstances.

[0120] In the 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.

[0121] In the disclosure, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the disclosure. In the description, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0122] Although the embodiments of the disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the disclosure, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the disclosure.

Claims

1. A piston assembly for a magnetorheological damper, the piston assembly comprising: Comprising: a piston rod having a first end and a second end; and a piston connected to the first end of the piston rod, the piston comprising: a housing provided with a first MR fluid inlet and outlet and a second MR fluid inlet and outlet, a first end core provided in the housing, an outer circumferential surface of the first end core and an inner circumferential surface of the housing having a first gap therebetween, the first gap being in communication with the first MR fluid inlet and outlet to form a first axial flow channel, a second end core provided in the housing, an outer circumferential surface of the second end core and an inner circumferential surface of the housing having a second gap therebetween, the second gap being in communication with the second MR fluid inlet and outlet to form a second axial flow channel, a main core having a central through hole, the main core being provided in the housing and located between the first end core and the second end core, the main core being spaced apart from the first end core and spaced apart from the second end core, a coil support provided in the housing, the coil support being sleeved on the main core, an electromagnetic coil wound on an outer circumferential surface of the coil support, a first support frame provided in the housing, the first support frame comprising a plurality of first support legs, the plurality of first support legs being clamped between the first end core and the main core and arranged radially to form a plurality of first radial flow channels in communication with the central through hole between the first end core and the main core, the first radial flow channels being in communication with the first gap, and a second support frame provided in the housing, the second support frame comprising a plurality of second support legs, the plurality of second support legs being clamped between the second end core and the main core and arranged radially to form a plurality of second radial flow channels in communication with the central through hole between the second end core and the main core, the second radial flow channels being in communication with the second gap. The housing comprises:

2. The magneto-rheological damper piston assembly of claim 1, wherein, a core sleeve; a first piston cover provided at a first end of the core sleeve and connected to the piston rod, the first MR fluid inlet and outlet being formed on the first piston cover and directly opposite the first gap in the axial direction of the core sleeve; and a second piston cover provided at a second end of the core sleeve and connected to the piston rod, the second MR fluid inlet and outlet being formed on the second piston cover and directly opposite the second gap in the axial direction of the core sleeve.

3. The piston assembly of the MR damper according to claim 2, wherein: the first MR fluid inlet and outlet are a plurality of and are spaced apart along the circumference of the first piston cover; and / or the second MR fluid inlet and outlet are a plurality of and are spaced apart along the circumference of the second piston cover. the first MR fluid inlet and outlet are arc-shaped extending along the circumference of the first piston cover, and / or the second MR fluid inlet and outlet are arc-shaped extending along the circumference of the second piston cover; 4. The magneto-rheological damper piston assembly of claim 2 or 3, wherein, 5. The piston assembly of the MR damper according to any one of claims 1-4, wherein: ​ The first end of the shell is provided with a first connecting hole, the first end core is provided with a second connecting hole, the first connecting hole, the second connecting hole and the central through hole of the main core are aligned along the axial center of the main core, the first end of the piston rod is connected in the first connecting hole and the second connecting hole, and the piston rod is provided with a lead wire through hole extending along the axial direction thereof. The electromagnetic coil includes a first lead wire and a second lead wire, and the first lead wire and the second lead wire are led out from the central through hole of the main core and then led out outward through the lead wire through hole.

6. The magneto-rheological damper piston assembly of claim 5, wherein, The lead wire through hole is filled with a filling layer for preventing the first lead wire and the second lead wire from moving.

7. The piston assembly of the magnetorheological damper according to any one of claims 1-6, wherein The outer circumferential surface of the coil support is provided with an annular groove, and the electromagnetic coil is located in the annular groove. The electromagnetic coil includes a first lead wire and a second lead wire. The annular groove has a first side wall and a second side wall. The first side wall is provided with a first through slot, and the first lead wire is led out outward through the first through slot. The second side wall is provided with a second through slot, and the second lead wire is led out outward through the second through slot.

8. The piston assembly of the magnetorheological damper according to claim 7, wherein The first through slot is opposite to one of the first legs, and the one of the first legs is provided with a first lead wire channel extending along the length direction thereof. The first lead wire extends inward along the radial direction of the main core through the first lead wire channel and then is led out outward along the axial direction of the main core. The second through slot is opposite to one of the second legs, and the one of the second legs is provided with a second lead wire channel extending along the length direction thereof. The second lead wire extends inward along the radial direction of the main core through the second lead wire channel and then is led out outward through the central through hole of the main core.

9. The piston assembly of the magnetorheological damper according to claim 8, wherein The first support frame includes a first support cylinder, and the first legs extend outward along the radial direction of the first support cylinder from the first support cylinder. A part of the first support cylinder is fitted in the central through hole of the main core. The first support cylinder is provided with a first guide slot extending along the axial direction thereof. The second support frame includes a second support cylinder, and the second legs extend outward along the radial direction of the second support cylinder from the second support cylinder. A part of the second support cylinder is fitted in the central through hole of the main core and abuts against the first support cylinder. The second support cylinder is provided with a second guide slot extending along the axial direction thereof. The first guide slot and the second guide slot are opposite to each other so as to guide the second lead wire to pass through the central through hole of the main core. The second guide slot is adjacent to and communicates with the second lead wire channel.

10. The magneto-rheological damper piston assembly of claim 9, wherein, 11. The piston assembly of the magnetorheological damper according to any one of claims 1-10, wherein ​ The first support frame comprises a first support cylinder, a portion of the first support cylinder is fitted into the central through hole of the main iron core, a plurality of first support legs are arranged along the circumference of the first support cylinder and connected to the outer circumferential surface of the first support cylinder, and the first support cylinder is provided with a first through groove for connecting the first radial flow channel and the central through hole; and / or The second support frame comprises a second support cylinder, a portion of the second support cylinder is fitted into the central through hole of the main iron core, a plurality of second support legs are arranged along the circumference of the second support cylinder and connected to the outer circumferential surface of the second support cylinder, and the second support cylinder is provided with a second through groove for connecting the second radial flow channel and the central through hole.

12. The magneto-rheological damper piston assembly of any one of claims 1-11, wherein, The coil support has opposite first and second end faces in the axial direction thereof; The first support leg is attached to the first end face, and the outer end face of the first support leg is flush with the outer circumferential edge of the first end face; and / or The second support leg is attached to the second end face, and the outer end face of the second support leg is flush with the outer circumferential edge of the second end face.

13. The piston assembly of the magnetorheological damper according to claim 12, wherein The first end face is provided with a plurality of first clamping grooves, and the plurality of first support legs are correspondingly clamped in the plurality of first clamping grooves; and / or The second end face is provided with a plurality of second clamping grooves, and the plurality of second support legs are correspondingly clamped in the plurality of second clamping grooves.

14. The magneto-rheological damper piston assembly of any one of claims 1-13, wherein, The outer circumferential surface of the shell is provided with an annular clamping groove, and an anti-friction member is arranged in the annular clamping groove, and the outer circumferential surface of the anti-friction member is higher than the outer circumferential surface of the shell.

15. A magnetorheological damper, characterized by, Comprising a cylinder having a first end and a second end; a piston assembly according to any one of claims 1-14, the piston of the piston assembly being movably arranged in the inner cavity of the cylinder along the axial direction of the cylinder, and the second end of the piston rod extending out of the second end of the cylinder.

16. The magnetorheological damper of claim 15, wherein, The magnetorheological damper further comprises a gas piston movably arranged in the inner cavity of the cylinder along the axial direction of the cylinder, so as to divide the inner cavity of the cylinder into a magnetorheological fluid chamber on the first side of the gas piston and a gas chamber on the second side of the gas piston, the cylinder is provided with a valve core opening communicating with the gas chamber, the valve core opening is provided with a valve core assembly, and the piston of the piston assembly is movably arranged in the magnetorheological fluid chamber.

17. The magnetorheological damper of claim 15, wherein, The magnetorheological damper further comprises a first connecting member connected to the second end of the piston rod and a second connecting member connected to the first end of the cylinder.

18. The magnetorheological damper of claim 17, wherein, The magnetorheological damper further comprises a buffer block located between the first connecting member and the second end of the cylinder and arranged on one of the first connecting member, the piston rod, and the second end of the cylinder.

19. A vehicle characterized by comprising: Comprising: a vehicle frame; a suspension; a magnetorheological damper according to any one of claims 15-17, the magnetorheological damper being arranged between the vehicle frame and the suspension.

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