Piston assembly of magnetorheological damper, magnetorheological damper and vehicle

Abstract

The embodiment of the invention discloses a piston assembly of a magnetorheological damper, the magnetorheological damper and a vehicle. The piston assembly comprises a piston rod and a piston, the piston comprises a shell, a first end iron core, a second end iron core, a main iron core, a coil support, an electromagnetic coil, a first supporting frame and a second supporting frame, the inner space of the shell is effectively utilized, and the effective length of a magnetorheological fluid channel is prolonged by adopting a radial flow channel and axial flow channel combination method; on the premise that the axial length of the piston is not increased, the number of the electromagnetic coils is not increased and the electric power of the whole machine is not increased, the requirement for increasing the damping force is met, in other words, under the condition of the same damping force, the axial length of the piston can be greatly shortened, and the size of the piston is reduced. The magnetorheological fluid channel is only arranged in the piston in a penetrating mode, and the structural strength of the piston rod is not affected. Therefore, the piston assembly has the advantages of being high in structural strength, compact in structure and small in size.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of dampers, and particularly relates to a piston assembly of a magneto-rheological damper, the magneto-rheological damper, and a vehicle with 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 smart material. Under the action of a magnetic field, the magneto-rheological fluid can complete the transformation from a Newtonian fluid to 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 channel for the flow of the magneto-rheological fluid, and a magnetic conducting core. In the related art, the magneto-rheological fluid channel 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, so as to increase the length of the magneto-rheological fluid channel 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. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, an embodiment of the present application provides a piston assembly of a magneto-rheological damper with increased damping force and small volume.

[0005] An embodiment of the present application further provides a magneto-rheological damper.

[0006] An embodiment of the present application further provides a vehicle.

[0007] The piston assembly of the magneto-rheological damper according to the embodiment of the present application 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 being provided with a first magneto-rheological fluid inlet and outlet and a second magneto-rheological fluid inlet and outlet, the first end core being arranged in the shell, a first gap being formed between the outer circumferential surface of the first end core and the inner circumferential surface of the shell, the first gap being communicated with the first magneto-rheological fluid inlet and outlet to form a first axial flow channel, the second end core being arranged in the shell, a second gap being formed between the outer circumferential surface of the second end core and the inner circumferential surface of the shell, the second gap being communicated with the second magneto-rheological fluid inlet and outlet to form a second axial flow channel, the main core having a central through hole, the main core being arranged in the shell 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, the coil support being arranged in the shell, the coil support being sleeved on the main core, the electromagnetic coil being wound on the outer circumferential surface of the coil support, the first support frame being arranged in the shell, 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 communicated with the central through hole between the first end core and the main core, the first radial flow channels being communicated with the first gap, the second support frame being arranged in the shell, 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 communicated with the central through hole between the second end core and the main core, the second radial flow channels being communicated with the second gap.

[0008] The piston assembly of the magneto-rheological damper according to the embodiment of the present application 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 application can be greatly shortened, and the volume of the piston is reduced. In addition, the magneto-rheological fluid channel in the piston assembly according to the embodiment of the present application only passes through the piston, without affecting the structural strength of the piston rod. The piston assembly according to the embodiment of the present application has the advantages of high structural strength, compact structure and small volume.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] In some embodiments, the second guide slot is adjacent to and in communication with the second lead channel.

[0018] 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 spaced apart along 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 spaced apart along 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.

[0019] 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.

[0020] 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.

[0021] In some embodiments, an annular clamping groove is arranged on the outer circumferential surface of the shell, and an abrasion-reducing element is arranged in the annular clamping groove, and the outer circumferential surface of the abrasion-reducing element is higher than the outer circumferential surface of the shell.

[0022] The magnetorheological damper of the embodiment of the present application comprises: a cylinder barrel having a first end and a second end; and a piston assembly, which is the piston assembly of the magnetorheological damper of any one of the above embodiments, and the piston of the piston assembly is movably arranged in the inner cavity of the cylinder barrel along the axial direction of the cylinder barrel, and the second end of the piston rod extends from the second end of the cylinder barrel.

[0023] The piston assembly in the magnetorheological damper of the embodiment of the present application adopts a method of combining radial flow channels and axial flow channels to extend the effective length of the magnetorheological fluid channel, thereby increasing the damping force of the magnetorheological damper without extending the axial length of the piston, increasing the number of electromagnetic coils, or increasing the power consumption of the whole machine.

[0024] In some embodiments, the magnetorheological damper further comprises a gas piston movably arranged in the inner cavity of the cylinder barrel along the axial direction of the cylinder barrel, so as to divide the inner cavity of the cylinder barrel 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 barrel 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 magnetorheological fluid chamber.

[0025] In some embodiments, 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 barrel.

[0026] In some embodiments, the magnetorheological damper further comprises a buffer block located between the first connecting member and the second end of the cylinder barrel and arranged on one of the first connecting member, the piston rod, and the second end of the cylinder barrel.

[0027] The vehicle of the embodiment of the present application comprises: a vehicle frame; a suspension; and a magnetorheological damper, which is the magnetorheological damper of any one of the above embodiments, and the magnetorheological damper is arranged between the vehicle frame and the suspension. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1is an exploded view of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0029] Figure 2 is a perspective view of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0030] Figure 3 is an end view of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0031] Figure 4 is a sectional view along line A-A in Figure 3 .

[0032] Figure 5 is a partial enlarged view of Figure 4 .

[0033] Figure 6 is a sectional view along line B-B in Figure 3 .

[0034] Figure 7 is a partial enlarged view of Figure 6 .

[0035] Figure 8 is a schematic diagram of a magnetic field distribution within a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0036] Figure 9 is a schematic diagram of a coil support of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0037] Figure 10 is a schematic diagram of an assembly of a coil support and an electromagnetic coil of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0038] Figure 11 is a schematic diagram of an assembly of a coil support, an electromagnetic coil and a main core of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0039] Figure 12 is a schematic diagram of an assembly of a coil support, an electromagnetic coil, a main core, a first support frame and a second support frame of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0040] Figure 13 is a schematic diagram of an assembly of a coil support, an electromagnetic coil, a main core, a first support frame and a second support frame of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0041] Figure 14 is a perspective view of a piston of a piston assembly of a magneto-rheological damper according to an embodiment of the present application.

[0042] Figure 15is another perspective view of the piston of the piston assembly of the magneto-rheological damper according to an embodiment of the application.

[0043] Figure 16 is a perspective view of the magneto-rheological damper according to an embodiment of the application.

[0044] Figure 17 is an exploded view of the magneto-rheological damper according to an embodiment of the application.

[0045] Figure 18 is a sectional view of the magneto-rheological damper according to an embodiment of the application.

[0046] Figure 19 A- Figure 19 E shows the operation process of the magneto-rheological damper according to an embodiment of the application.

[0047] Figure 20 is a partial schematic view of the vehicle according to an embodiment of the application.

[0048] Figure 21 is a partial plan view of the vehicle according to an embodiment of the application.

[0049] Reference signs:

[0050] 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 channel 1201, second axial flow channel 1202, shell 121, first magneto-rheological fluid inlet and outlet 1211, second magneto-rheological fluid inlet and outlet 1212, iron core sleeve 1213, first piston cover 1214, second piston cover 1215, first connecting hole 1216, wear-reducing piece 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 channel 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 channel 1282, second lead wire passage 1283, second support cylinder 1284, second guide slot 1285, second through slot 1286,

[0051] Magnetorheological damper 200, cylinder 210, magnetorheological fluid cavity 211, first chamber 2111, second chamber 2112, gas chamber 212, valve core opening 213, valve core assembly 214, gas piston 220, first connecting piece 230, second connecting piece 240, buffer block 250, guide cover 260, vehicle 300, vehicle frame 310, suspension 320. DETAILED DESCRIPTION

[0052] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0053] As shown in the drawings, Figures 1-15 The piston assembly 100 of the magnetorheological damper of the embodiments of the present application 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.

[0054] The piston 120 includes a shell 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 shell 121.

[0055] The shell 121 is provided with a first magnetorheological fluid inlet and outlet 1211 and a second magnetorheological fluid inlet and outlet 1212 for the entry and exit of the magnetorheological fluid, i.e. the magnetorheological fluid can enter the shell 121 through the first magnetorheological fluid inlet and outlet 1211 and the second magnetorheological fluid inlet and outlet 1212, and can also be discharged from the shell through the first magnetorheological fluid inlet and outlet 1211 and the second magnetorheological fluid inlet and outlet 1212.

[0056] As shown in the drawings, Figure 5 The outer circumferential surface of the first end core 122 and the inner circumferential surface of the shell 121 have a first gap 1221 therebetween, and the first gap 1221 is in communication with the first magnetorheological 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 shell 121 have a second gap 1231 therebetween, and the second gap 1231 is in communication with the second magnetorheological 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 in the axial direction of the piston 120.

[0057] The coil support 125 is sleeved on the main iron core 124, and the electromagnetic coil 126 is wound on the outer circumferential surface of the coil support 125. The main iron core 124 has a central through hole 1241, and the main iron core 124 is located between the first end iron core 122 and the second end iron core 123 in the axial direction. The main iron core 124 is spaced apart from the first end iron core 122, and the main iron core 124 is spaced apart from the second end iron core 123, that is, the main iron core 124 and the first end iron core 122 have a first interval, and the main iron core 124 and the second end iron core 123 have a second interval.

[0058] The first support frame 127 includes a plurality of first legs 1271, which are clamped between the first end iron core 122 and the main iron core 124 and are arranged radially to form a plurality of first radial flow channels 1272 between the first end iron core 122 and the main iron core 124. The first radial flow channels 1272 are in communication with the central through hole 1241, and the first radial flow channels 1272 are in communication with the first gap 1221. In other words, the plurality of first legs 1271 are located in the first interval, which divides the first interval into a plurality of first radial flow channels 1272 extending in the radial direction of the main iron 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, that is, in communication with the first axial flow channel 1201.

[0059] The second support frame 128 includes a plurality of second legs 1281, which are clamped between the second end iron core 123 and the main iron core 124 and are arranged radially to form a plurality of second radial flow channels 1282 between the second end iron core 123 and the main iron core 124. The second radial flow channels 1282 are in communication with the central through hole 1241, and the second radial flow channels 1282 are in communication with the second gap 1231. In other words, the plurality of second legs 1281 are located in the second interval, which divides the second interval into a plurality of second radial flow channels 1282 extending in the radial direction of the main iron 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, that is, in communication with the second axial flow channel 1202.

[0060] 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.

[0061] The magnetorheological fluid will produce a cohesive effect under the action of a magnetic field, which increases the viscosity of the magnetorheological fluid and increases the resistance of the magnetorheological fluid flow channel, thereby producing a damping effect. By adjusting the current to change the magnetic field strength of the electromagnetic coil 126, the viscosity of the magnetorheological fluid in the magnetorheological fluid flow channel is adjusted to achieve adjustment of the damping force. Figures 1-15 This is a schematic diagram of the magnetic field distribution within the piston assembly 100. The electromagnetic coil 126 generates a magnetic field when energized, magnetizing the main iron core 124, the first end iron core 122, the second end iron core 123 and the shell 121. The main iron core 124, the first end iron core 122, the second end iron core 123 and the shell 121 are magnetized to generate a magnetic field in the magnetorheological fluid flow channel.

[0062] When the magnetorheological fluid enters the first axial flow channel 1201 from the first magnetorheological fluid inlet and outlet 1211, the magnetorheological fluid flows sequentially through the first axial flow channel 1201, the first radial flow channel 1272, the central through hole 1241, the second radial flow channel 1282, and the second axial flow channel 1202, and then flows out of 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 flows sequentially through the second axial flow channel 1202, the second radial flow channel 1282, the central through hole 1241, the first radial flow channel 1272, and the first axial flow channel 1201, and then flows out of the first magnetorheological fluid inlet and outlet 1211.

[0063] The piston assembly of the magnetorheological damper according to the present invention effectively utilizes the internal space of the piston housing. By combining radial and axial flow channels, the effective length of the magnetorheological fluid channel is extended. This achieves increased damping force without increasing the axial length of the piston, the number of electromagnetic coils, or the overall power consumption of the device. Furthermore, under the same damping force conditions, the axial length of the piston according to the present invention can be significantly shortened, reducing the piston's volume. Furthermore, the magnetorheological fluid channel in the piston assembly according to the present invention is located solely within the piston, without compromising the structural strength of the piston rod.

[0064] Therefore, the piston assembly of the embodiment of the present invention has the advantages of high structural strength, compact structure and small size.

[0065] In some embodiments, as Figures 4-7 As shown, the housing 121 includes an iron core sleeve 1213, a first piston cover 1214 and a second piston cover 1215. The first piston cover 1214 is provided at a first end (eg Figures 4-7The first magnetorheological fluid inlet and outlet 1211 is arranged on the first piston cover 1214 and is axially opposite to the first gap 1221 of the iron core sleeve 1213, and the first magnetorheological fluid inlet and outlet 1211 and the first gap 1221 form a first axial flow channel 1201, in which the magnetorheological fluid flows in the axial direction of the shell 121.

[0066] The second piston cover 1215 is arranged at the second end (for example, the right end in the figure) of the iron core sleeve 1213 and is connected to the piston rod 110, and the second magnetorheological fluid inlet and outlet 1212 is arranged on the second piston cover 1215 and is axially opposite to the second gap 1231 of the iron core sleeve 1213, and the second magnetorheological fluid inlet and outlet 1212 and the second gap 1231 form a second axial flow channel 1202, in which the magnetorheological fluid flows in the axial direction of the shell 121. Figures 1-15

[0067] It should be noted that the iron core sleeve 1213 is a magnetically conductive material, and the first piston cover 1214 and the second piston cover 1215 are non-magnetic materials and do not participate in magnetization to form a magnetic field.

[0068] In some specific examples, the first magnetorheological fluid inlet and outlet 1211 is a plurality (for example, four in the example shown in the figure), and the plurality of first magnetorheological fluid inlets and outlets 1211 are arranged in a circumferential direction of the first piston cover 1214 and are axially opposite to the annular first gap 1221 of the iron core sleeve 1213. Figures 1-15 The magnetorheological fluid can enter the first gap 1221 from the plurality of first magnetorheological fluid inlets and outlets 1211 and then be dispersed into the plurality of first radial flow channels 1272, or the magnetorheological fluid in the first gap 1221 is dispersedly discharged from the plurality of first magnetorheological fluid inlets and outlets 1211.

[0069] The second magnetorheological fluid inlet and outlet 1212 is a plurality (for example, four in the example shown in the figure), and the plurality of second magnetorheological fluid inlets and outlets 1212 are arranged in a circumferential direction of the second piston cover 1215 and are axially opposite to the annular first gap 1221 of the iron core sleeve 1213. Figure 14 The magnetorheological fluid can enter the second gap 1231 from the plurality of second magnetorheological fluid inlets and outlets 1212 and then be dispersed into the plurality of second radial flow channels 1282, or the magnetorheological fluid in the second gap 1231 is dispersedly discharged from the plurality of second magnetorheological fluid inlets and outlets 1212.

[0070] Further, as Figure 15 and Figures 1-15 ​As shown, the first MR fluid inlet and outlet 1211 is arc-shaped extending along the circumference of the first piston cover 1214 to match the annular first gap 1221, and the cross section of the arc-shaped first MR fluid inlet and outlet 1211 is large enough for the MR fluid to flow smoothly. The second MR fluid inlet and outlet 1212 is arc-shaped extending along the circumference of the second piston cover 1215 to match the annular second gap 1231, and the cross section of the arc-shaped second MR fluid inlet and outlet 1212 is large enough for the MR fluid to flow smoothly.

[0071] 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 Figure 4 As shown, the number of the first MR fluid inlet and outlet 1211, the first radial flow channel 1272, the second MR fluid inlet and outlet 1212, and the second radial flow channel 1282 is four, and 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.

[0072] In some embodiments, as shown in Figure 5 and Figure 5 As shown, the first end of the housing 121 is provided with a first connecting hole 1216 (for example Figure 5 In the embodiment, the first connecting hole 1216 is arranged on the first piston cover 1214 of the housing 121), and the first end iron core 122 is provided with a second connecting hole 1222, the first connecting hole 1216, the second connecting hole 1222 and the middle through hole 1241 of the main iron core 124 are aligned along the axial center of the main iron 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.

[0073] Specifically, as shown in Figures 9-13 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 matched in the first connecting hole 1216, and the small diameter section 114 of the piston rod 110 is matched 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.

[0074] In some embodiments, as shown in Figures 9-13As shown, 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 out of the coil body of the electromagnetic coil 126 which is wound on the coil support 125. The first lead wire 1261 and the second lead wire 1262 are used to be connected to an external power supply and be powered, and then the size of the current in the electromagnetic coil 126 can be adjusted to change the magnetic field strength.

[0075] Specifically, as shown in Figure 5 , the annular groove 1251 has a first side wall 1252 and a second side wall 1253, the first side wall 1252 is provided with a first through slot 1254 which penetrates through the first side wall 1252, and the second side wall 1253 is provided with a second through slot 1255 which penetrates through the second side wall 1253. The first lead wire 1261 of the electromagnetic coil 126 extends outwards through the first through slot 1254, and the second lead wire 1262 extends outwards through the second through slot 1255.

[0076] As shown in Figures 1-15 and 12 , the first through slot 1254 is opposite to one of the plurality of first legs 1271 of the first support frame 127, and the one of the plurality of first legs 1271 is provided with a first lead wire channel 1273 which extends along the length direction of the one of the plurality of first legs 1271. After the first lead wire 1261 extends outwards through the first through slot 1254, the first lead wire 1261 extends inwards along the radial direction of the main iron core 124 through the first lead wire channel 1273, and then extends outwards after extending to the center through hole 1241 of the main iron core 124.

[0077] As an example, as shown in Figure 5 , the first lead wire channel 1273 is a through slot which is provided on the side of the one of the plurality of first legs 1271 which faces the main iron core 124. Alternatively, the first lead wire channel 1273 is a through hole which is provided in the one of the plurality of first legs 1271.

[0078] As shown in Figures 1-15 and 13 , the second through slot 1255 is opposite to one of the plurality of second legs 1281 of the second support frame 128, and the one of the plurality of second legs 1281 is provided with a second lead wire channel 1283 which extends along the length direction of the one of the plurality of second legs 1281. After the second lead wire 1262 extends outwards through the second through slot 1255, the second lead wire 1262 extends inwards along the radial direction of the main iron core 124 through the second lead wire channel 1283, and then extends outwards after extending through the center through hole 1241 of the main iron core 124.

[0079] As an example, as shown in Figures 1-8As shown, the second lead-wire channel 1283 is a through slot provided on the side of the second leg 1281 facing the main iron core 124. Alternatively, the second lead-wire channel 1283 is a through hole provided in the second leg 1281.

[0080] Furthermore, if Figure 5 As shown, the piston rod 110 is provided with a lead through hole 111 extending along its axial direction, and the lead through hole 111 is axially opposite to the central through hole 1241 of the main iron core 124. The first lead 1261 and the second lead 1262 are led out from the central through hole 1241 of the main iron core 124 and then lead out through the lead through hole 111. For example, Figure 4 As shown, the first lead 1261 and the second lead 1262 extend leftward along the lead through hole 111 .

[0081] like Figure 5 and Figures 1-15 As shown, to prevent the first lead 1261 and the second lead 1262 from moving, the lead through-hole 111 is filled with a filling layer 112. The filling layer 112 fills the gap between the first lead 1261 and the second lead 1262 and the wall surface of the lead through-hole 111, preventing the first lead 1261 and the second lead 1262 from colliding with each other or colliding with the wall surface of the lead through-hole 111, thereby causing damage to the leads and affecting power supply. The filling layer 112 also serves as a seal.

[0082] Optionally, the filling layer 112 is a sponge material, or other filling materials that can play a buffering and sealing role.

[0083] In some embodiments, as Figures 1-15 As shown, the first support frame 127 includes a first support tube 1274, and a plurality of first legs 1271 are spaced apart along the circumference of the first support tube 1274 and connected to the outer circumference of the first support tube 1274. A portion of the first support tube 1274 fits within the central through hole 1241 of the main core 124 to assemble the first support frame 127 with the main core 124.

[0084] Second support frame 128 includes a second support tube 1284. A plurality of second legs 1281 are spaced apart along the circumference of second support tube 1284 and connected to the outer circumference of second support tube 1284. A portion of second support tube 1284 fits within central through hole 1241 of main core 124, thereby assembling second support frame 128 with main core 124.

[0085] The first supporting tube 1274 and the second supporting tube 1284 abut against each other in the central through hole 1241 to position the relative positions of the first supporting frame 127 and the second supporting frame 128 .

[0086] exist Figure 1In the illustrated example, a plurality of first legs 1271 extend radially outward from a first support tube 1274, forming fan-shaped first radial flow channels 1272 between adjacent first legs 1271 along the circumference of the first support tube 1274. The first support tube 1274 is provided with a plurality of first through-grooves 1276 extending through its wall, with each of the plurality of first through-grooves 1276 corresponding one-to-one with the plurality of first radial flow channels 1272. The first through-grooves 1276 connect the corresponding first radial flow channels 1272 with the central through-hole 1241. Magnetorheological fluid can flow from the first radial flow channels 1272 into the central through-hole 1241 via the first through-grooves 1276, or from the central through-hole 1241 into the first radial flow channels 1272 via the first through-grooves 1276.

[0087] A plurality of second legs 1281 extend radially outward from the second support tube 1284, forming fan-shaped second radial flow channels 1282 between adjacent second legs 1281 in the circumferential direction of the second support tube 1284. The second support tube 1284 is provided with a plurality of second through-grooves 1286 extending through its wall, with each of the plurality of second through-grooves 1286 corresponding one-to-one with the plurality of second radial flow channels 1282. The second through-grooves 1286 are configured to connect the corresponding second radial flow channels 1282 with the central through-hole 1241, allowing the magnetorheological fluid to flow from the second radial flow channels 1282 into the central through-hole 1241 through the second through-grooves 1286, or to flow from the central through-hole 1241 into the second radial flow channels 1282 through the second through-grooves 1286.

[0088] like Figure 5 and Figure 5 As shown, the first support cylinder 1274 is provided with a first guide groove 1275 extending along its axial direction. The second support cylinder 1284 is provided with a second guide groove 1285 extending along its axial direction. The first guide groove 1275 and the second guide groove 1285 are axially opposed to each other with respect to the central through-hole 1241, and are used to guide the second lead wire 1262 of the electromagnetic coil 126 through the central through-hole 1241 of the main iron core 124. The second lead wire 1262 and the first lead wire 1261 are then guided outward through the lead wire through-hole 111 in the piston rod 110. In other words, the segment of the second lead wire 1262 located in the central through-hole 1241 fits within the first guide groove 1275 and the second guide groove 1285. The provision of the first guide groove 1275 and the second guide groove 1285 prevents the second lead wire 1262 from floating in the central through-hole 1241 and affecting the flow of the magnetorheological fluid, thereby improving the assembly stability of the internal components of the piston assembly 100.

[0089] In order to lead out the second lead 1262 more smoothly, Figures 9-13As shown, the second guide slot 1285 provided on the second support cylinder 1284 is adjacent to and communicates with the second lead wire passage 1283. The second lead wire 1262 extends into the second guide slot 1285 at a short distance after extending out of the second lead wire passage 1283, reducing the length of the exposed wire segment of the second lead wire 1262 and further improving the assembly stability of the internal components of the piston assembly 100.

[0090] In some embodiments, as shown in Figures 9-13 As shown, 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 abut 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 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 abut 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 to maximize the length of the second radial flow channel 1282 defined by the second legs 1281.

[0091] As an example, as shown in Figures 1-18 The first end face 1256 is provided with a plurality of first clamping slots 1258, and the first legs 1271 are correspondingly clamped in the first clamping slots 1258 to assemble the first support frame 127 with the coil support 125 and improve the assembly stability therebetween. The second end face 1257 is provided with a plurality of second clamping slots 1259, and the second legs 1281 are correspondingly clamped in the second clamping slots 1259 to assemble the second support frame 128 with the coil support 125 and improve the assembly stability therebetween.

[0092] Alternatively, other assembly methods can be used 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 application.

[0093] In some embodiments, as shown in Figures 16-19 The outer periphery of the housing 121 is provided with an annular clamping slot, and the annular clamping slot is provided with an anti-friction member 1217, 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 used to support between the piston 120 and the inner wall of the cylinder barrel 210, and plays a guiding, friction-reducing and sealing role.

[0094] In assembling the piston assembly 100 of the embodiment of the present application, the electromagnetic coil 126 is first mounted on the coil holder 125 and the first lead wire 1261 and the second lead wire 1262 are led out from the annular groove 1251 of the coil holder 125. Then, the main core 124, the first support frame 127 and the second support frame 128 are mounted in sequence, wherein the first support cylinder 1274 of the first support frame 127 abuts against the second support cylinder 1284 of the second support frame 128.

[0095] 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 center through hole 1241 of the main core 124 along the second lead groove 1285 of the second support cylinder 1284 and the second lead groove 1285 of the first support cylinder 1274.

[0096] The first end core 122 and the second end core 123 are mounted, 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 mounted, 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.

[0097] 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 mounted on the outside of the housing 121.

[0098] The following describes the magnetorheological damper 200 of the embodiment of the present application. Figure 18 The magnetorheological damper 200 comprises a cylinder 210 and a piston assembly, wherein the piston assembly is the piston assembly 100 of any of the above embodiments.

[0099] The cylinder 210 has a first end (for example, the right end in Figure 18 ) and a second end (for example, the left end in Figure 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 (for example, the right end in Figure 18 ) of the piston rod 110 is connected to the piston 120, and the second end (for example, the left end in Figure 18 ) of the piston rod 110 extends out of the second end (for example, the left end in Figures 16-19 ) of the cylinder 210.

[0100] The piston assembly in the magnetorheological damper of the embodiment of the present invention adopts a method of combining radial flow channels and axial flow channels to extend the effective length of the magnetorheological fluid channel, thereby increasing the damping force of the magnetorheological damper without extending the axial length of the piston, increasing the number of electromagnetic coils, and increasing the power consumption of the entire machine.

[0101] In some embodiments, as Figure 18 As shown, the magnetorheological damper 200 further includes a gas piston 220, which is movably disposed 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 first side of the gas piston 220 (e.g., Figure 18 The magnetorheological fluid chamber 211 and the second side of the gas piston 220 (eg Figures 16-18 The cylinder barrel 210 has an air chamber 212 (on the right side of the image). Air chamber 212 can be filled with nitrogen. A valve core opening 213 communicating with air chamber 212 is provided on the cylinder barrel 210. A valve core assembly 214 is provided at the valve core opening 213 to control the flow of air into air chamber 212. The piston 120 of the piston assembly 100 is movably disposed within the magnetorheological fluid chamber 211.

[0102] The gas piston 220 blocks the magnetorheological fluid chamber 211 and the gas chamber 212. When the magnetorheological damper 200 is in operation, the gas piston 220 moves within the cylinder 210, changing the volume ratio between the magnetorheological fluid chamber 211 and the gas chamber 212. This converts the gas pressure within the gas chamber 212 into hydraulic pressure, providing a restoring force for the piston rod 110 of the piston assembly 100 and ensuring that the pressure of the magnetorheological fluid within the cylinder 210 remains above its vaporization threshold, thereby suppressing oil vaporization.

[0103] In some embodiments, as Figures 16-18 As shown, the magnetorheological damper 200 further includes a first connector 230 and a second connector 240. The first connector 230 is connected to the second end of the piston rod 110 for connection to the first damper, while the second connector 240 is connected to the first end of the cylinder 220 for connection to the second damper. The magnetorheological damper 200 acts between the first and second dampers, utilizing the flow damping of the magnetorheological fluid to dissipate impact energy and achieve damping and vibration reduction.

[0104] Optionally, the first connecting member 230 is a suspension connecting member, the first shock absorber is a suspension of the vehicle, and the suspension connecting member is used to be connected to the suspension of the vehicle.

[0105] Optionally, the second connecting member 240 is a frame connecting member, the second shock-absorbing body is the frame of the vehicle, and the frame connecting member is used to be connected to the frame of the vehicle.

[0106] In some embodiments, the magneto-rheological damper 200 further comprises a bumper 250, which is located between the first connecting member 230 and the second end of the cylinder 210 and is arranged on one of the first connecting member 230, the piston rod 110 and the second end of the cylinder 210. The bumper 250 is used to slow down the impact and limit the position when the magneto-rheological damper 200 is compressed to the limit position, avoiding the direct collision between the first connecting member 230 and the second end of the cylinder 210, causing damage to the components.

[0107] As shown in Figures 16-18 , the bumper 250 is sleeved on the piston rod 110 and connected with the first connecting member 230. When the magneto-rheological damper 200 is compressed, the first connecting member 230 moves towards the second end of the cylinder 210, and the bumper 250 contacts the second end of the cylinder 210 to slow down the impact.

[0108] Alternatively, the bumper 250 can also be sleeved on the piston rod 110 and connected with the second end of the cylinder 210.

[0109] As shown in Figure 20 , the magneto-rheological damper 200 further comprises a guide cover 260 arranged at the second end of the cylinder 210, the piston rod 110 extends outwardly through the 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 function for the axial movement of the piston rod 110, while sealing the second end of the cylinder 210.

[0110] As shown in Figure 21 and Figure 19 , the vehicle 300 of the embodiment of the present application comprises a vehicle frame 310, a suspension 320 and a magneto-rheological damper, which is the magneto-rheological damper 200 in any of the above embodiments, and is arranged between the vehicle frame 310 and the suspension 320 to provide damping and shock absorption.

[0111] When the vehicle 300 passes through a bumpy road, the road impact makes the suspension 320 jump constantly, thereby driving the piston rod 110 of the magneto-rheological damper 200 to extend and contract relative to the cylinder 210. In this process, the magneto-rheological fluid in the magneto-rheological fluid cavity 211 of the cylinder 210 repeatedly flows through the magneto-rheological fluid flow channel in the piston 120, and the damping force generated by the magneto-rheological fluid constantly consumes the impact and jump, so that the vehicle 300 remains stable.

[0112] The compression and recovery process of the magneto-rheological damper 200 of the embodiment of the present application will be described below with reference to Figure 19 A- Figure 20 E, and Figure 21 and Figure 20 .

[0113] AsFigure 21 and Figure 19 As shown, the first connecting member 230 (suspension connecting member) of the magnetorheological damper 200 is hinged to the lifting lug on the suspension 320 , and the second connecting member 240 (frame connecting member) of the magnetorheological damper 200 is connected to the frame 310 .

[0114] like Figure 19 A shows the fully restored state of the magnetorheological damper 200 , where the piston rod 110 is in the longest extended state, the piston 120 is located at the leftmost end of the magnetorheological fluid chamber 211 , and the volume of the air chamber 212 is at its maximum state.

[0115] like Figure 19 As shown in Figure B, when vehicle 300 bumps, piston rod 110 is compressed and pushes piston 120 to the right. The portion of magnetorheological fluid chamber 211 located to the left of piston 120 is first chamber 2111, and the portion located to the right of piston 120 is second chamber 2112. As piston 120 moves rightward, the magnetorheological fluid in second chamber 2112 enters piston 120 through second magnetorheological fluid inlet / outlet 1212 and flows sequentially through second axial flow channel 1202, second radial flow channel 1282, central through-hole 1241, first radial flow channel 1272, and first axial flow channel 1201, out of first magnetorheological fluid inlet / outlet 1211, and into first chamber 2111. Simultaneously, the rightward movement of air piston 220 compresses air chamber 212, reducing the volume of air chamber 212 and increasing the volume of magnetorheological fluid chamber 211.

[0116] like Figure 19 As shown in Figure C, the piston rod 110 is compressed to its limit position, and the buffer block 250 contacts the guide cover 260. At this point, most of the magnetorheological fluid is in the first chamber 2111, the air piston 220 is at its maximum rightward displacement, and the air chamber 212 is in its maximum compression state.

[0117] like Figure 19 As shown in D, the force on the piston rod 110 is reduced or disappears. Under the action of the high-pressure nitrogen in the air chamber 212, the air piston 220 gradually moves to the left, the volume of the air chamber 212 increases, and the volume of the magnetorheological fluid chamber 211 decreases, causing the piston rod 110 to gradually move to the left and reset and extend out of the cylinder 210. The piston rod 110 drives the piston 120 to gradually move to the left. In this process, the magnetorheological fluid in the first chamber 2111 enters the piston 120 from the first magnetorheological fluid inlet and outlet 1211, and flows out from the second magnetorheological fluid inlet and outlet 1212 through the first axial flow channel 1201-first radial flow channel 1272-center through hole 1241-second radial flow channel 1282-second axial flow channel 1202 in sequence, and flows into the second chamber 2112 until the piston rod 110 and the piston 120 are completely restored to their initial state (as shown in FIG. ​ E).

[0118] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "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 merely intended to facilitate the description of the present application and simplify the description, and are not intended to 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 application.

[0119] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0120] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0121] In the present application, 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.

[0122] 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 is included in at least one embodiment or example of the present 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 terminology "comprising" is used in the disclosure as comprising but not limited to, that is, it is open-ended and does not exclude the presence of additional features, structures, materials, or characteristics.

[0123] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present disclosure, and the ordinary skilled in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present 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 disposed 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 disposed 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 disposed in the housing 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 disposed 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 disposed 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 being 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 disposed 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 being 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 disposed 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 an axial direction of the core sleeve; and a second piston cover disposed 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 a circumferential direction of the first piston cover; and / or the second MR fluid inlet and outlet are a plurality of and are spaced apart along a circumferential direction of the second piston cover. The first MR fluid inlet and outlet are arc-shaped extending along a circumferential direction of the first piston cover, and / or the second MR fluid inlet and outlet are arc-shaped extending along a circumferential direction 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 claim 1, 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 claim 1, 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.

10. The magneto-rheological damper piston assembly of claim 9, wherein, The second guide slot is adjacent to and communicates with the second lead wire channel.

11. The piston assembly of the magnetorheological damper according to claim 1, 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 claim 1, 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 claim 1, 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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