Piston assembly of magnetorheological damper, magnetorheological damper and vehicle

Abstract

The embodiment of the utility model discloses a piston assembly of a magneto-rheological damper, the magneto-rheological 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, and 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 utility model belongs to the technical field of dampers. Specifically, the utility model relates to a piston assembly of a magnetorheological damper, a magnetorheological damper and a vehicle having the magnetorheological damper. Background Art

[0002] Magnetorheological dampers are widely used in the vibration control of robots, automobiles and large civil structures. The magnetorheological fluid used in magnetorheological dampers is a new type of intelligent material. Under the action of a magnetic field, the magnetorheological fluid can complete the transformation from Newtonian fluid to quasi-solid, and this process is reversible. A magnetorheological damper mainly includes an electromagnetic coil for generating a magnetic field, a magnetorheological fluid flow channel for the magnetorheological fluid to flow through, and a magnetic conducting core. In the related art, the magnetorheological 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 piston length is usually increased and the number of coils is increased, so as to increase the length of the magnetorheological fluid channel in the axial direction of the piston. However, due to the increase in the piston length, the volume of the magnetorheological damper is large and it occupies a large space. In addition, in the damper in the related art, the lead wires of the electromagnetic coil are complex. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0004] For this reason, an embodiment of the utility model provides a piston assembly of a magnetorheological damper with increased damping force and small volume.

[0005] An embodiment of the utility model also provides a magnetorheological damper.

[0006] An embodiment of the utility model also provides a vehicle.

[0007] The piston assembly of the magnetorheological damper according to an embodiment of the present invention includes: 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 includes: a housing, a first-end iron core, a second-end iron core, a main iron core, a coil bracket, an electromagnetic coil, a first support frame, and a second support frame. The housing is provided with a first magnetorheological fluid inlet and outlet and a second magnetorheological fluid inlet and outlet. The first-end iron core is disposed inside the housing, and there is a first gap between the outer peripheral surface of the first-end iron core and the inner peripheral surface of the housing. The first gap communicates with the first magnetorheological fluid inlet and outlet to form a first axial flow channel. The second-end iron core is disposed inside the housing, and there is a second gap between the outer peripheral surface of the second-end iron core and the inner peripheral surface of the housing. The second gap communicates with the second magnetorheological fluid inlet and outlet to form a second axial flow channel. The main iron core has a central through hole, and the main iron core is disposed inside the housing and located between the first-end iron core and the second-end iron core. The main iron core is spaced apart from the first-end iron core and spaced apart from the second-end iron core. The coil bracket is disposed inside the housing, and the coil bracket sleeves the main iron core. The electromagnetic coil is wound around the outer peripheral surface of the coil bracket. The first support frame is disposed inside the housing, and the first support frame includes a plurality of first legs. The plurality of first legs are clamped between the first-end iron core and the main iron core and are arranged radially to form a plurality of first radial flow channels communicating with the central through hole between the first-end iron core and the main iron core. The first radial flow channels communicate with the first gap. The second support frame is disposed inside the housing, and the second support frame includes a plurality of second legs. The plurality of second legs are clamped between the second-end iron core and the main iron core and are arranged radially to form a plurality of second radial flow channels communicating with the central through hole between the second-end iron core and the main iron core. The second radial flow channels communicate with the second gap.

[0008] The piston assembly of the magnetorheological damper according to the embodiment of the present invention effectively utilizes the internal space of the housing of the piston, and adopts a method of combining radial flow channels and axial flow channels to extend the effective length of the magnetorheological fluid channel. Without extending the axial length of the piston, without increasing the number of electromagnetic coils, and without increasing the overall power consumption of the machine, the requirement of increasing the damping force can be achieved. 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 invention can be greatly shortened, reducing the volume of the piston. In addition, in the piston assembly according to the embodiment of the present invention, the magnetorheological fluid channel only penetrates through the piston, without affecting the structural strength of the piston rod. The piston assembly according to the embodiment of the present invention has the advantages of high structural strength, compact structure, and small volume.

[0009] In some embodiments, the housing includes: an iron core sleeve; a first piston cover disposed at a first end of the iron core sleeve and connected to the piston rod, with the first magnetorheological fluid inlet / outlet formed on the first piston cover and axially aligned with the first gap in the iron core sleeve; and a second piston cover disposed at a second end of the iron core sleeve and connected to the piston rod, with the second magnetorheological fluid inlet / outlet formed on the second piston cover and axially aligned with the second gap in the iron core sleeve.

[0010] In some embodiments, there are multiple first magnetorheological fluid inlet / outlets spaced circumferentially along the first piston cover; and / or, there are multiple second magnetorheological fluid inlet / outlets spaced circumferentially along the second piston cover.

[0011] In some embodiments, the first magnetorheological fluid inlet / outlet is an arc extending circumferentially along the first piston cover, and / or, the second magnetorheological fluid inlet / outlet is an arc extending circumferentially along the second piston cover;

[0012] In some embodiments, a first connection hole is provided at a first end of the housing, and a second connection hole is provided in the iron core at the first end. The first connection hole, the second connection hole, and the central through-hole in the main iron core are axially centered and aligned along the axis of the main iron core. The first end of the piston rod is connected in the first connection hole and the second connection hole, and a lead perforation extending along its axis is provided in the piston rod; the electromagnetic coil includes a first lead and a second lead, and the first lead and the second lead are led out through the lead perforation after being led out from the central through-hole of the main iron core.

[0013] In some embodiments, a filling layer for preventing the movement of the first lead and the second lead is filled in the lead perforation.

[0014] In some embodiments, an annular groove is provided on the outer peripheral surface of the coil bracket, and the electromagnetic coil is located in the annular groove. The electromagnetic coil includes a first lead and a second lead. The annular groove has a first side wall and a second side wall. A first through groove is provided on the first side wall, and the first lead passes through the first through groove and is led outwards. A second through groove is provided on the second side wall, and the second lead passes through the second through groove and is led outwards.

[0015] In some embodiments, the first through groove is opposite to one of the plurality of first legs, and a first lead channel extending along the length direction thereof is provided on the one first leg. The first lead extends radially inward along the main iron core through the first lead channel and then extends axially outward along the main iron core. The second through groove is opposite to one of the plurality of second legs, and a second lead channel extending along the length direction thereof is provided on the one second leg. The second lead extends radially inward along the main iron core through the second lead channel and then passes through the central through hole of the main iron core and extends outward.

[0016] In some embodiments, the first support frame includes a first support cylinder, and a plurality of the first legs extend radially outward from the first support cylinder. A part of the first support cylinder is fitted in the central through hole of the main iron core. A first guiding groove extending along the axial direction thereof is provided on the first support cylinder. The second support frame includes a second support cylinder, and a plurality of the second legs extend radially outward from the second support cylinder. A part of the second support cylinder is fitted in the central through hole of the main iron core and abuts against the first support cylinder. A second guiding groove extending along the axial direction thereof is provided on the second support cylinder. The first guiding groove is opposite to the second guiding groove to guide the second lead to pass through the central through hole of the main iron core.

[0017] In some embodiments, the second guiding groove is adjacent to the second lead channel and communicates with the second lead channel.

[0018] In some embodiments, the first support frame includes a first support cylinder, and a part of the first support cylinder is fitted in the central through hole of the main iron core. A plurality of the first legs are circumferentially spaced apart along the first support cylinder and are connected to the outer peripheral surface of the first support cylinder. The first support cylinder is provided with a first through groove for communicating the first radial flow channel with the central through hole; and / or, the second support frame includes a second support cylinder, and a part of the second support cylinder is fitted in the central through hole of the main iron core. A plurality of the second legs are circumferentially spaced apart along the second support cylinder and are connected to the outer peripheral surface of the second support cylinder. The second support cylinder is provided with a second through groove for communicating the second radial flow channel with the central through hole.

[0019] In some embodiments, the coil bracket has opposite first end face and second end face in its axial direction; the first leg is attached to the first end face, and the outer end face of the first leg is flush with the outer peripheral edge of the first end face; and / or, the second leg is attached to the second end face, and the outer end face of the second leg is flush with the outer peripheral edge of the second end face.

[0020] In some embodiments, a plurality of first clamping grooves are provided on the first end face, and a plurality of the first legs are respectively clamped in the plurality of first clamping grooves; and / or, a plurality of second clamping grooves are provided on the second end face, and a plurality of the second legs are respectively clamped in the plurality of second clamping grooves.

[0021] In some embodiments, an annular clamping groove is provided on the outer peripheral surface of the housing, a wear-reducing member is provided in the annular clamping groove, and the outer peripheral surface of the wear-reducing member is higher than the outer peripheral surface of the housing.

[0022] The magnetorheological damper according to an embodiment of the present invention includes: a cylinder barrel having a first end and a second end; a piston assembly which is the piston assembly of the magnetorheological damper according to any one of the above embodiments, 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 out of the second end of the cylinder barrel.

[0023] In the piston assembly of the magnetorheological damper according to an embodiment of the present invention, a method of combining a radial flow channel and an axial flow channel is adopted to extend the effective length of the magnetorheological fluid channel, and on the premise of not extending the axial length of the piston, not increasing the number of electromagnetic coils and not increasing the overall power consumption of the machine, the damping force of the magnetorheological damper is increased.

[0024] In some embodiments, the magnetorheological damper further includes a gas piston which is movably arranged in the inner cavity of the cylinder barrel along the axial direction of the cylinder barrel 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. A valve core opening communicating with the gas chamber is provided on the cylinder barrel, a valve core assembly is provided at the valve core opening, and the piston of the piston assembly is movably arranged in the magnetorheological fluid chamber.

[0025] In some embodiments, the magnetorheological damper further includes a first connecting member and a second connecting member, the first connecting member is connected to the second end of the piston rod, and the second connecting member is connected to the first end of the cylinder barrel.

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

[0027] The vehicle according to an embodiment of the present invention includes: a vehicle frame; a suspension; a magnetorheological damper which is the magnetorheological damper according to any one of the above embodiments, and the magnetorheological damper is arranged between the vehicle frame and the suspension. Description of the Drawings

[0028] Figure 1It is an exploded view of the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

[0029] Figure 2 It is a perspective view of the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

[0030] Figure 3 It is an end view of the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

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

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

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

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

[0035] Figure 8 It is a schematic diagram of the magnetic field distribution inside the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

[0036] Figure 9 It is a schematic diagram of the coil support of the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

[0037] Figure 10 It is an assembly schematic diagram of the coil support and the electromagnetic coil of the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

[0038] Figure 11 It is an assembly schematic diagram of the coil support, the electromagnetic coil and the main iron core of the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

[0039] Figure 12 It is an assembly schematic diagram of the coil support, the electromagnetic coil, the main iron core, the first support frame and the second support frame of the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

[0040] Figure 13 It is an assembly schematic diagram of the coil support, the electromagnetic coil, the main iron core, the first support frame and the second support frame of the piston assembly of the magnetorheological damper from another perspective according to an embodiment of the present utility model.

[0041] Figure 14 It is a perspective view of the piston of the piston assembly of the magnetorheological damper according to an embodiment of the present utility model.

[0042] Figure 15It is a perspective view of the piston of the piston assembly of the magnetorheological damper according to an embodiment of the present invention from another perspective.

[0043] Figure 16 It is a perspective view of the magnetorheological damper according to an embodiment of the present invention.

[0044] Figure 17 It is an exploded view of the magnetorheological damper according to an embodiment of the present invention.

[0045] Figure 18 It is a cross-sectional view of the magnetorheological damper according to an embodiment of the present invention.

[0046] Figure 19 In it, A - E show the operation process of the magnetorheological damper according to an embodiment of the present invention.

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

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

[0049] Reference numerals:

[0050] Piston assembly 100, piston rod 110, lead 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, housing 121, first magnetorheological fluid inlet / outlet 1211, second magnetorheological fluid inlet / outlet 1212, iron core sleeve 1213, first piston cover 1214, second piston cover 1215, first connection hole 1216, anti-friction part 1217, first end iron core 122, first gap 1221, second connection hole 1222, second end iron core 123, second gap 1231, main iron core 124, central through hole 1241, coil support 125, annular groove 1251, first side wall 1252, second side wall 1253, first through groove 1254, second through groove 1255, first end face 1256, second end face 1257, first clamping groove 1258, second clamping groove 1259, electromagnetic coil 126, first lead 1261, second lead 1262, first support frame 127, first leg 1271, first radial flow channel 1272, first lead channel 1273, first support cylinder 1274, first guiding groove 1275, first through slot 1276, second support frame 128, second leg 1281, second radial flow channel 1282, second lead channel 1283, second support cylinder 1284, second guiding groove 1285, second through slot 1286

[0051] Magnetorheological damper 200, cylinder barrel 210, magnetorheological fluid chamber 211, first chamber 2111, second chamber 2112, air chamber 212, valve core opening 213, valve core assembly 214, air piston 220, first connecting member 230, second connecting member 240, buffer block 250, guide cover 260, vehicle 300, vehicle frame 310, suspension 320. Detailed implementation mode

[0052] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0053] As Figures 1 - 15 shown, the piston assembly 100 of the magnetorheological damper according to the embodiment of the present invention includes a piston rod 110 and a piston 120. 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 housing 121, a first end iron core 122, a second end iron core 123, a main iron core 124, a coil bracket 125, an electromagnetic coil 126, a first support frame 127, and a second support frame 128. The first end iron core 122, the second end iron core 123, the main iron core 124, the coil bracket 125, the electromagnetic coil 126, the first support frame 127, and the second support frame are all arranged inside the housing 121.

[0055] The housing 121 is provided with a first magnetorheological fluid inlet / outlet 1211 and a second magnetorheological fluid inlet / outlet 1212 for the magnetorheological fluid to enter and exit. That is, the magnetorheological fluid can enter the housing 121 through the first magnetorheological fluid inlet / outlet 1211 and the second magnetorheological fluid inlet / outlet 1212, and can also be discharged from the housing through the first magnetorheological fluid inlet / outlet 1211 and the second magnetorheological fluid inlet / outlet 1212.

[0056] As Figure 5 shown, there is a first gap 1221 between the outer peripheral surface of the first end iron core 122 and the inner peripheral surface of the housing 121. The first gap 1221 communicates with the first magnetorheological fluid inlet / outlet 1211 to form a first axial flow channel 1201. There is a second gap 1231 between the outer peripheral surface of the second end iron core 123 and the inner peripheral surface of the housing 121. The second gap 1231 communicates with the second magnetorheological fluid inlet / outlet 1212 to form a second axial flow channel 1202. It can be understood that both the first gap 1221 and the second gap 1231 are 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.

[0057] The coil support 125 is sleeved on the main iron core 124, and the electromagnetic coil 126 is wound around the outer peripheral surface of the coil support 125. The main iron core 124 has a central through hole 1241, and the main iron core 124 is axially located between the first end iron core 122 and the second end iron core 123. 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, there is a first gap between the main iron core 124 and the first end iron core 122, and there is a second gap between the main iron core 124 and the second end iron core 123.

[0058] The first support frame 127 includes a plurality of first legs 1271. The plurality of first legs 1271 are clamped between the first end iron core 122 and the main iron core 124 and are radially arranged 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 communicate with the central through hole 1241, and the first radial flow channels 1272 communicate with the first gap 1221. In other words, the plurality of first legs 1271 are located in the first gap, and the first gap is divided into a plurality of first radial flow channels 1272 extending radially along the main iron core 124. The inner end (the end close to the central through hole 1241) of the first radial flow channel 1272 communicates with the central through hole 1241, and the outer end (the end close to the inner peripheral surface of the housing 121) of the first radial flow channel 1272 communicates with the first gap 1221, that is, communicates with the first axial flow channel 1201.

[0059] The second support frame 128 includes a plurality of second legs 1281. The plurality of second legs 1281 are clamped between the second end iron core 123 and the main iron core 124 and are radially arranged to form a plurality of second radial flow channels 1282 that communicate with the central through hole 1241 between the second end iron core 123 and the main iron core 124. The second radial flow channels 1282 communicate with the second gap 1231. In other words, the plurality of second legs 1281 are located in the second gap, and the second gap is divided into a plurality of second radial flow channels 1282 extending radially along the main iron core 124. The inner end (the end close to the central through hole 1241) of the second radial flow channel 1282 communicates with the central through hole 1241, and the outer end (the end close to the inner peripheral surface of the housing 121) of the second radial flow channel 1282 communicates with the second gap 1231, that is, communicates 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 to form the magnetorheological fluid flow channel of the piston 120.

[0061] Magnetorheological fluid will produce a coagulation effect under the action of a magnetic field, increasing the viscosity of the magnetorheological fluid and the resistance of the magnetorheological fluid flowing through the channel, thereby generating a damping effect. By adjusting the magnitude of the current, the magnetic field strength of the electromagnetic coil 126 is changed, and further the viscosity of the magnetorheological fluid in the magnetorheological fluid channel is adjusted to achieve the adjustment of the damping force. As Figure 8 is a schematic diagram of the magnetic field distribution inside 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 housing 121. The main iron core 124, the first end iron core 122, the second end iron core 123, and the housing 121 are magnetized to generate a magnetic field inside the magnetorheological fluid channel.

[0062] When the magnetorheological fluid enters the first axial channel 1201 from the first magnetorheological fluid inlet / outlet 1211, the magnetorheological fluid sequentially passes through the first axial channel 1201 - the first radial channel 1272 - the central through hole 1241 - the second radial channel 1282 - the second axial channel 1202 and flows out from the second magnetorheological fluid inlet / outlet 1212. When the magnetorheological fluid enters the second axial channel 1202 from the second magnetorheological fluid inlet / outlet 1212, the magnetorheological fluid sequentially passes through the second axial channel 1202 - the second radial channel 1282 - the central through hole 1241 - the first radial channel 1272 - the first axial channel 1201 and flows out from the first magnetorheological fluid inlet / outlet 1211.

[0063] The piston assembly of the magnetorheological damper according to the embodiment of the present invention effectively utilizes the internal space of the piston housing, and adopts a method of combining radial channels and axial channels to extend the effective length of the magnetorheological fluid channel. Without extending the axial length of the piston, increasing the number of electromagnetic coils, and increasing the overall power consumption of the machine, the requirement of increasing the damping force is achieved. 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 invention can be greatly shortened, reducing the volume of the piston. In addition, the magnetorheological fluid channel in the piston assembly according to the embodiment of the present invention only penetrates through the piston and does not affect the structural strength of the piston rod.

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

[0065] In some embodiments, as Figures 1 - 15 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 the first end of the iron core sleeve 1213 (for example Figures 4 - 7at the left end of and is connected to the piston rod 110. The first magnetorheological fluid inlet / outlet 1211 is provided on the first piston cover 1214 and axially opposite to the first gap 1221 in the iron core sleeve 1213. The first magnetorheological fluid inlet / outlet 1211 and the first gap 1221 form a first axial flow channel 1201, and the magnetorheological fluid flows axially in the housing 121 within the first axial flow channel 1201.

[0066] The second piston cover 1215 is provided at the second end of the iron core sleeve 1213 (for example Figures 4 - 7 at the right end of and is connected to the piston rod 110. The second magnetorheological fluid inlet / outlet 1212 is provided on the second piston cover 1215 and axially opposite to the second gap 1231 in the iron core sleeve 1213. The second magnetorheological fluid inlet / outlet 1212 and the second gap 1231 form a second axial flow channel 1202, and the magnetorheological fluid flows axially in the housing 121 within the second axial flow channel 1202.

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

[0068] In some specific examples, the first magnetorheological fluid inlet / outlets 1211 are multiple (for example, Figures 1 - 15 in the example shown, the number of the first magnetorheological fluid inlet / outlets 1211 is four), and the multiple first magnetorheological fluid inlet / outlets 1211 are circumferentially spaced along the first piston cover 1214 and are all axially opposite to the annular first gap 1221 in the iron core sleeve 1213. The magnetorheological fluid can enter the first gap 1221 from the multiple first magnetorheological fluid inlet / outlets 1211 and then disperse into the multiple first radial flow channels 1272, or the magnetorheological fluid in the first gap 1221 dispersedly discharges from the multiple first magnetorheological fluid inlet / outlets 1211 out of the piston 120.

[0069] The second magnetorheological fluid inlet / outlets 1212 are multiple (for example, Figures 1 - 15 in the example shown, the number of the first magnetorheological fluid inlet / outlets 1211 is four), and the multiple second magnetorheological fluid inlet / outlets 1212 are circumferentially spaced along the second piston cover 1215 and are all axially opposite to the annular first gap 1221 in the iron core sleeve 1213. The magnetorheological fluid can enter the second gap 1231 from the multiple second magnetorheological fluid inlet / outlets 1212 and then disperse into the multiple second radial flow channels 1282, or the magnetorheological fluid in the second gap 1231 dispersedly discharges from the multiple second magnetorheological fluid inlet / outlets 1212 out of the piston 120.

[0070] Furthermore, as Figure 14 and Figure 15As shown, the first magnetorheological fluid inlet / outlet 1211 is an arc extending circumferentially along the first piston cover 1214 to match the annular first gap 1221. At the same time, the cross-section of the arc-shaped first magnetorheological fluid inlet / outlet 1211 is relatively large, allowing the magnetorheological fluid to flow smoothly. The second magnetorheological fluid inlet / outlet 1212 is an arc extending circumferentially along the second piston cover 1215 to match the annular second gap 1231. At the same time, the cross-sectional area of the arc-shaped second magnetorheological fluid inlet / outlet 1212 is relatively large, allowing the magnetorheological fluid to flow smoothly.

[0071] Optionally, multiple first magnetorheological fluid inlet / outlets 1211 and multiple first radial flow channels 1272 correspond to each other one by one in the axial direction of the housing 121, and multiple second magnetorheological fluid inlet / outlets 1212 and multiple second radial flow channels 1282 correspond to each other one by one in the axial direction of the housing 121, making the flow of the magnetorheological fluid smoother. For example, as Figures 1 - 15 shown, the number of the first magnetorheological fluid inlet / outlets 1211, the first radial flow channels 1272, the second magnetorheological fluid inlet / outlets 1212, and the second radial flow channels 1282 is four each. The four first magnetorheological fluid inlet / outlets 1211 and the four first radial flow channels 1272 correspond to each other one by one in the axial direction of the housing 121, and the four second magnetorheological fluid inlet / outlets 1212 and the four second radial flow channels 1282 correspond to each other one by one in the axial direction of the housing 121.

[0072] In some embodiments, as Figure 4 and Figure 5 shown, the first end of the housing 121 is provided with a first connection hole 1216 (for example, Figure 5 in, the first connection hole 1216 is provided on the first piston cover 1214 of the housing 121). The first end iron core 122 is provided with a second connection hole 1222. The first connection hole 1216, the second connection hole 1222, and the central through hole 1241 in the middle of the main iron core 124 are aligned along the axial center of the main iron core 124. The first end of the piston rod 110 is connected in the first connection hole 1216 and the second connection hole 1222.

[0073] Specifically, as Figure 5 shown, the diameter of the first connection hole 1216 is larger than the diameter of the second connection 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 connection hole 1216, and the small-diameter section 114 of the piston rod 110 is fitted in the second connection hole 1222. Optionally, the large-diameter section 113 is threadedly connected to the first connection hole 1216, and the small-diameter section 114 is threadedly connected to the second connection hole 1222.

[0074] In some embodiments, as Figures 9 - 13As shown in the figure, an annular groove 1251 is provided on the outer peripheral surface of the coil support 125. The coil body of the electromagnetic coil 126 is located within the annular groove 1251. The annular groove 1251 is used to limit the position of the coil body of the electromagnetic coil 126 and prevent it from shifting. The electromagnetic coil 126 includes a first lead 1261 and a second lead 1262. The first lead 1261 and the second lead 1262 extend out from the coil body portion of the electromagnetic coil 126 wound around the coil support 125. The first lead 1261 and the second lead 1262 are used to connect to an external power supply and be energized, and thus the magnitude of the current in the electromagnetic coil 126 can be adjusted to change the magnetic field strength.

[0075] Specifically, as Figures 9 - 13 shown in the figure, the annular groove 1251 has a first side wall 1252 and a second side wall 1253. A first through groove 1254 penetrating through it is provided on the first side wall 1252, and a second through groove 1255 penetrating through it is provided on the second side wall 1253. The first lead 1261 of the electromagnetic coil 126 passes through the first through groove 1254 and extends outwards, and the second lead 1262 passes through the second through groove 1255 and extends outwards.

[0076] As Figure 5 and 12 shown in the figure, the first through groove 1254 is opposite to one of the multiple first legs 1271 of the first support frame 127. This one first leg 1271 is provided with a first lead channel 1273 extending along its length direction. After the first lead 1261 passes through the first through groove 1254 and extends outwards, it extends inwards along the radial direction of the main iron core 124 through the first lead channel 1273. After extending to the central through hole 1241 of the main iron core 124, it extends outwards.

[0077] As an example, as Figures 1 - 15 shown in the figure, the first lead channel 1273 is a through groove provided on the side surface of this one first leg 1271 facing the main iron core 124. Optionally, the first lead channel 1273 is a through hole provided within this one first leg 1271.

[0078] As Figure 5 and 13 shown in the figure, the second through groove 1255 is opposite to one of the multiple second legs 1281 of the second support frame 128. This one second leg 1281 is provided with a second lead channel 1283 extending along its length direction. After the second lead 1262 passes through the second through groove 1255 and extends outwards, it extends inwards along the radial direction of the main iron core 124 through the second lead channel 1283, and then passes through the central through hole 1241 of the main iron core 124 and extends outwards.

[0079] As an example, as Figures 1 - 15As shown, the second lead channel 1283 is a through slot provided on the side of the one second leg 1281 facing the main iron core 124. Optionally, the second lead channel 1283 is a through hole provided in the one second leg 1281.

[0080] Further, as Figures 1 - 8 shown, a lead perforation 111 extending along the axial direction thereof is provided in the piston rod 110, and the lead perforation 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 led outwards through the lead perforation 111. For example, as Figure 5 shown, the first lead 1261 and the second lead 1262 extend leftward along the lead perforation 111.

[0081] As Figure 4 and Figure 5 shown, in order to prevent the first lead 1261 and the second lead 1262 from moving, the lead perforation 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 hole wall surface of the lead perforation 111, preventing the first lead 1261 and the second lead 1262 from colliding with each other or colliding with the hole wall surface of the lead perforation 111, resulting in lead damage and affecting power-on. The filling layer 112 also plays a sealing role.

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

[0083] In some embodiments, as Figures 1 - 15 shown, the first support frame 127 includes a first support cylinder 1274, and a plurality of first legs 1271 are arranged at intervals along the circumferential direction of the first support cylinder 1274 and are connected to the outer peripheral surface of the first support cylinder 1274. A part 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.

[0084] The second support frame 128 includes a second support cylinder 1284, and a plurality of second legs 1281 are arranged at intervals along the circumferential direction of the second support cylinder 1284 and are connected to the outer peripheral surface of the second support cylinder 1284. A part 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.

[0085] The first support cylinder 1274 abuts against the second support cylinder 1284 in the central through hole 1241 to position the relative positions of the first support frame 127 and the second support frame 128.

[0086] In Figures 1 - 15In the illustrated example, multiple first legs 1271 extend radially outward from the first support cylinder 1274 along the radial direction of the first support cylinder 1274. In the circumferential direction of the first support cylinder 1274, a fan-shaped first radial flow channel 1272 is formed between two adjacent first legs 1271. The first support cylinder 1274 is provided with multiple first through grooves 1276 penetrating through its cylinder wall, and the multiple first through grooves 1276 correspond to the multiple first radial flow channels 1272 one by one. The first through grooves 1276 are used to connect the corresponding first radial flow channels 1272 and the central through hole 1241. The magnetorheological fluid can flow from the first radial flow channel 1272 into the central through hole 1241 through the first through grooves 1276, or flow from the central through hole 1241 into the first radial flow channel 1272 through the first through grooves 1276.

[0087] Multiple second legs 1281 extend radially outward from the second support cylinder 1284 along the radial direction of the second support cylinder 1284. In the circumferential direction of the second support cylinder 1284, a fan-shaped second radial flow channel 1282 is formed between two adjacent second legs 1281. The second support cylinder 1284 is provided with multiple second through grooves 1286 penetrating through its cylinder wall, and the multiple second through grooves 1286 correspond to the multiple 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 channel 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 channel 1282 through the second through grooves 1286.

[0088] As Figure 1 and Figure 5 shown, the first support cylinder 1274 is provided with a first guiding groove 1275 extending along its axial direction. The second support cylinder 1284 is provided with a second guiding groove 1285 extending along its axial direction. The first guiding groove 1275 and the second guiding groove 1285 are opposite in the axial direction of the central through hole 1241, and are used to guide the second lead 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 1262 and the first lead 1261 are led out together through the lead through hole 111 in the piston rod 110. In other words, the line segment of the second lead 1262 located in the central through hole 1241 fits in the first guiding groove 1275 and the second guiding groove 1285. The arrangement of the first guiding groove 1275 and the second guiding groove 1285 prevents the second lead 1262 from floating in the central through hole 1241 and affecting the flow of the magnetorheological fluid, and improves the assembly stability of the internal components of the piston assembly 100.

[0089] To lead out the second lead 1262 more smoothly, as Figure 5As shown, the second guiding groove 1285 provided on the second supporting cylinder 1284 is adjacent to the second lead channel 1283 and communicates with the second lead channel 1283. After the second lead 1262 extends out along the second lead channel 1283, it extends into the second guiding groove 1285 at a relatively short distance, reducing the exposed segment length of the second lead 1262 and further improving the assembly stability of the internal components of the piston assembly 100.

[0090] In some embodiments, as Figures 9 - 13 shown, the coil bracket 125 has opposite first end face 1256 and second end face 1257 in its axial direction. The first leg 1271 of the first support frame 127 fits against the first end face 1256, and the outer end face of the first leg 1271 is flush with the outer peripheral edge of the first end face 1256 to maximize the length of the first radial flow channel 1272 defined by the first leg 1271. The second leg 1281 of the second support frame 128 fits against the second end face 1257, and the outer end face of the second leg 1281 is flush with the outer peripheral edge of the second end face 1257 to maximize the length of the second radial flow channel 1282 defined by the second leg 1281.

[0091] As an example, as Figures 9 - 13 shown, a plurality of first card slots 1258 are provided on the first end face 1256, and a plurality of first legs 1271 are correspondingly clamped in the plurality of first card slots 1258 to assemble the first support frame 127 and the coil bracket 125, improving the assembly stability between the two. A plurality of second card slots 1259 are provided on the second end face 1257, and a plurality of second legs 1281 are correspondingly clamped in the plurality of second card slots 1259 to assemble the second support frame 128 and the coil bracket 125, improving the assembly stability between the two.

[0092] Optionally, other assembly methods can be adopted between the first support frame 127 and the coil bracket 125, and between the second support frame 128 and the coil bracket 125. The present invention does not limit this.

[0093] In some embodiments, as Figures 1 - 18 shown, an annular card slot is provided on the outer peripheral surface of the housing 121, and an anti-friction member 1217 is provided in the annular card slot. The outer peripheral surface of the anti-friction member 1217 is higher than the outer peripheral surface 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, playing roles of guiding, reducing friction, and sealing.

[0094] When assembling the piston assembly 100 of the embodiments of the present utility model, the electromagnetic coil 126 can be first installed on the coil bracket 125, and the first lead 1261 and the second lead 1261 can be led out from the annular groove 1251 of the coil bracket 125. Then, the main iron core 124, the first support bracket 127, and the second support bracket 128 are installed in sequence, where the first support cylinder 1274 of the first support bracket 127 abuts against the second support cylinder 1284 of the second support bracket 128.

[0095] Let the first lead 1261 extend along the first lead channel 1273 of the first support bracket 127, and the second lead 1262 extend along the second lead channel 1274 of the second support bracket 128. And, the second lead 1262 passes through the central through hole 1241 of the main iron core 124 along the second guiding groove 1285 of the second support cylinder 1284 and the second guiding groove 1285 of the first support cylinder 1274.

[0096] Install the first end iron core 122 and the second end iron core 123, so that the first lead 1261 and the second lead 1262 extend out from the second connection hole 1222 of the first end iron core 122. Install the iron core sleeve 1213, the first piston cover 1214, and the second piston cover 1215, so that the first lead 1261 and the second lead 1262 extend out from the first connection hole 1216 of the first piston cover 1214.

[0097] Connect the piston rod 110 to the piston 120, so that the first lead 1261 and the second lead 1262 extend outwards along the lead through hole 111 of the piston rod 110. Install the anti-friction member 1217 on the outer side of the housing 121.

[0098] Next, according to Figures 16 - 19 describe the magnetorheological damper 200 of the embodiments of the present utility model. The magnetorheological damper 200 includes a cylinder barrel 210 and a piston assembly, where the piston assembly is the piston assembly 100 in any of the above embodiments.

[0099] The cylinder barrel 210 has a first end (for example Figure 18 the right end in Figure 18 ) and a second end (for example Figure 18 the left end in Figure 18 ). The piston 120 of the piston assembly 100 is movably arranged axially along the cylinder barrel 210 in the inner cavity of the cylinder barrel 210, and the first end (for example Figure 18 the right end in Figure 18 ) of the piston rod 110 is connected to the piston 120, and the second end (for example Figure 18 the left end in Figure 18 ) of the piston rod 110 extends out from the second end (for example Figure 18 the left end in

[0100] In the piston assembly of the magnetorheological damper according to the embodiment of the present utility model, a method of combining a radial flow channel and an axial flow channel is adopted to extend the effective length of the magnetorheological fluid channel, thereby increasing the damping force of the magnetorheological damper on the premise of not extending the axial length of the piston, not increasing the number of electromagnetic coils, and not increasing the power consumption of the whole machine.

[0101] In some embodiments, as Figures 16 - 19 shown, the magnetorheological damper 200 further includes a gas piston 220. The gas piston 220 is movably disposed in the inner cavity of the cylinder barrel 210 along the axial direction of the cylinder barrel 210 to divide the inner cavity of the cylinder barrel 210 into a magnetorheological fluid chamber 211 on the first side of the gas piston 220 (for example Figure 18 the left side in Figure 18 ) and a gas chamber 212 on the second side of the gas piston 220 (for example

[0102] the right side in

[0103] ). Nitrogen can be filled in the gas chamber 212. A valve core opening 213 communicating with the gas chamber 212 is provided on the cylinder barrel 210, and a valve core assembly 214 for controlling the inflation into the gas chamber 212 is provided at the valve core opening 213. The piston 120 of the piston assembly 100 is movably disposed in the magnetorheological fluid chamber 211. In some embodiments, as Figures 16 - 18 shown, the magnetorheological damper 200 further includes a first connecting member 230 and a second connecting member 240. The first connecting member 230 is connected to the second end of the piston rod 110 and is used to connect to the first shock absorber. The second connecting member 240 is connected to the first end of the cylinder barrel 220 and is used to connect to the second shock absorber. The magnetorheological damper 200 acts between the first shock absorber and the second shock absorber, and uses the flow damping of the magnetorheological fluid to consume the impact energy and achieve damping and shock absorption.

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

[0105] Optionally, the second connecting member 240 is a frame connecting member, and the second shock absorber is a vehicle frame. The frame connecting member is used to connect to the vehicle frame.

[0106] In some embodiments, the magnetorheological damper 200 further includes a buffer block 250. The buffer block 250 is located between the first connecting member 230 and the second end of the cylinder barrel 210 and is provided on one of the first connecting member 230, the piston rod 110, and the second end of the cylinder barrel 210. The buffer block 250 is used to slow down the impact and limit the position when the magnetorheological 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 barrel 210 and cause component damage.

[0107] As an example, as Figures 16 - 18 shown, the buffer block 250 is sleeved on the piston rod 110 and connected to the first connecting member 230. When the magnetorheological damper 200 is compressed, the first connecting member 230 moves towards the direction close to the second end of the cylinder barrel 210, and the buffer block 250 contacts the second end of the cylinder barrel 210 to play a buffering role.

[0108] Optionally, the buffer block 250 can also be sleeved on the piston rod 110 and connected to the second end of the cylinder barrel 210.

[0109] As Figures 16 - 18 shown, the magnetorheological damper 200 further includes a guide cover 260. The guide cover 260 is provided at the second end of the cylinder barrel 210. The piston rod 110 passes through the central through hole of the guide cover 260 and extends outwards, and there is a movable seal between the piston rod 110 and the guide cover 260. The guide cover 260 provides a guiding function for the axial movement of the piston rod 110 and seals the second end of the cylinder barrel 210 at the same time.

[0110] As Figure 20 and Figure 21 shown, the vehicle 300 of the embodiment of the present invention includes a vehicle frame 310, a suspension 320, and a magnetorheological damper. The magnetorheological damper is the magnetorheological damper 200 in any one of the above embodiments. The magnetorheological damper 200 is provided between the vehicle frame 310 and the suspension 320 to play a damping and shock-absorbing role.

[0111] When the vehicle 300 passes through a bumpy road surface, the road surface impact causes the suspension 320 to continuously bounce, thereby driving the piston rod 110 of the magnetorheological damper 200 to continuously expand and contract relative to the cylinder barrel 210. During this process, the magnetorheological fluid in the magnetorheological fluid chamber 211 of the cylinder barrel 210 repeatedly flows through the magnetorheological fluid flow path in the piston 120, and the damping force generated by the magnetorheological fluid continuously consumes the impact bounce, so that the vehicle 300 maintains stability.

[0112] Next, refer to Figure 19 A-E in Figure 20 and Figure 21 to describe in detail the compression and restoration process of the magnetorheological damper 200 of the embodiment of the present invention.

[0113] As Figure 20 andFigure 21 As shown, the first connecting member 230 (suspension connecting member) of the magnetorheological damper 200 is hinged to the 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] As Figure 19 shown in A, the magnetorheological damper 200 is in the fully restored state. At this time, 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 in the maximum state.

[0115] As Figure 19 shown in B, when the vehicle 300 jolts, the piston rod 110 is compressed by the force and pushes the piston 120 to the right. The part of the magnetorheological fluid chamber 211 on the left side of the piston 120 is the first chamber 2111, and the part on the right side of the piston 120 is the second chamber 2112. During the process of the piston 120 moving to the right, the magnetorheological fluid in the second chamber 2112 enters the piston 120 from the second magnetorheological fluid inlet / outlet 1212, and successively flows out from the first magnetorheological fluid inlet / outlet 1211 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 first chamber 2111. At the same time, the air piston 220 moves to the right to compress the air chamber 212, the volume of the air chamber 212 decreases, and the volume of the magnetorheological fluid chamber 211 increases.

[0116] As Figure 19 shown in C, the piston rod 110 is compressed by the force to the limit position, and the buffer block 250 contacts and limits the guide cover 260. At this time, most of the magnetorheological fluid is in the first chamber 2111, the air piston 220 is also at the maximum right - moving point, and the air chamber 212 is in the maximum compressed state.

[0117] As Figure 19 shown in D, when the force on the piston rod 110 decreases 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, the volume of the magnetorheological fluid chamber 211 decreases, so that the piston rod 110 gradually moves to the left to reset and extends out of the cylinder barrel 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 / outlet 1211, and successively flows out from the second magnetorheological fluid inlet / outlet 1212 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 second chamber 2112 until the piston rod 110 and the piston 120 are fully restored to the initial state (as Figure 19 shown in E).

[0118] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0119] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0120] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0121] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0122] In the present utility model, terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0123] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A piston assembly of a magnetorheological damper, characterized in that: include: 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: The housing is provided with a first magnetorheological fluid inlet and outlet and a second magnetorheological fluid inlet and outlet, a first end iron core, the first end iron core is arranged in the shell, a first gap is formed between the outer circumference of the first end iron core and the inner circumference of the shell, the first gap is connected with the first magnetorheological fluid inlet and outlet to form a first axial flow channel, a second end iron core, the second end iron core is arranged in the shell, a second gap is formed between the outer circumference of the second end iron core and the inner circumference of the shell, and the second gap is connected with the inlet and outlet of the second magnetorheological fluid to form a second axial flow channel, a main iron core, the main iron core having a central through hole, the main iron core being disposed in the housing and between the first end iron core and the second end iron core, the main iron core being spaced apart from the first end iron core and the second end iron core, A coil support, wherein the coil support is arranged in the housing and sleeved on the main iron core. an electromagnetic coil, wherein the electromagnetic coil is wound on the outer peripheral surface of the coil support, a first support frame, the first support frame being arranged in the housing, the first support frame comprising a plurality of first legs, the plurality of first legs being sandwiched between the first end core and the main core and being arranged radially to form a plurality of first radial flow channels communicating 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, and A second support frame, the second support frame is arranged in the shell, the second support frame includes a plurality of second legs, the plurality of second legs are clamped between the second end core and the main core and are arranged radially to form a plurality of second radial flow channels connected to the central through hole between the second end core and the main core, and the second radial flow channels are connected to the second gap.

2. The piston assembly of the magnetorheological damper according to claim 1, characterized in that: The housing comprises: Core sleeve; a first piston cover, the first piston cover being disposed at a first end of the core sleeve and connected to the piston rod, the first magnetorheological 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 The second piston cover is arranged at the second end of the core sleeve and connected to the piston rod. The second magnetorheological fluid inlet and outlet are formed on the second piston cover and face the second gap in the axial direction of the core sleeve.

3. The piston assembly of the magnetorheological damper according to claim 2, characterized in that: The first magnetorheological fluid inlet and outlet are multiple and arranged at intervals along the circumference of the first piston cover; and / or, The second magnetorheological fluid inlet and outlet are multiple and are arranged at intervals along the circumference of the second piston cover.

4. The piston assembly of the magnetorheological damper according to claim 2 or 3, characterized in that: The first magnetorheological fluid inlet and outlet is in the shape of an arc extending along the circumference of the first piston cover, and / or the second magnetorheological fluid inlet and outlet is in the shape of an arc extending along the circumference of the second piston cover.

5. The piston assembly of the magnetorheological damper according to claim 1, characterized in that: The first end of the shell is provided with a first connection hole, the first end iron core is provided with a second connection hole, the first connection hole, the second connection hole and the middle through hole of the main iron core are aligned along the axial center of the main iron core, the first end of the piston rod is connected in the first connection hole and the second connection hole, and the piston rod is provided with a lead through hole extending along its axial direction; The electromagnetic coil comprises 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 iron core and then led out through the lead wire through hole.

6. The piston assembly of the magnetorheological damper according to claim 5, characterized in that: The lead through-hole is filled with a filling layer for preventing the first lead and the second lead from moving.

7. The piston assembly of the magnetorheological damper according to claim 1, characterized in that: An annular groove is provided on the outer circumference of the coil support, 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. A first through groove is provided on the first side wall, and the first lead wire passes through the first through groove to be led outward. A second through groove is provided on the second side wall, and the second lead wire passes through the second through groove to be led outward.

8. The piston assembly of the magnetorheological damper according to claim 7, characterized in that: The first through slot is opposite to one of the first legs among the plurality of the first legs, and the first leg is provided with a first lead wire passage extending along its length direction, and the first lead wire extends inwardly along the radial direction of the main iron core through the first lead wire passage and then is led outwardly along the axial direction of the main iron core. The second through slot is opposite to a second leg among the plurality of second legs, and the second leg is provided with a second lead wire channel extending along its length direction. The second lead wire extends radially inwardly through the second lead wire channel along the main iron core and then passes through the central through hole of the main iron core to be led outward.

9. The piston assembly of the magnetorheological damper according to claim 8, characterized in that: The first support frame includes a first support tube, a plurality of first legs extend radially outward from the first support tube, a portion of the first support tube is engaged in the central through hole of the main iron core, and the first support tube is provided with a first guide groove extending along its axial direction. The second support frame includes a second support tube, a plurality of second legs extend radially outward from the second support tube, a portion of the second support tube fits in the central through hole of the main iron core and abuts against the first support tube, and the second support tube is provided with a second guide groove extending along its axial direction, and the first guide groove is opposite to the second guide groove so as to guide the second lead wire to pass through the central through hole of the main iron core.

10. The piston assembly of the magnetorheological damper according to claim 9, characterized in that: The second guide groove is adjacent to the second guide wire passage and communicates with the second guide wire passage.

11. The piston assembly of the magnetorheological damper according to claim 1, characterized in that: The first support frame includes a first support tube, a portion of which fits into the central through hole of the main iron core, a plurality of first legs are arranged at intervals along the circumference of the first support tube and connected to the outer circumferential surface of the first support tube, and the first support tube is provided with a first through groove for connecting the first radial flow channel with the central through hole; and / or The second support frame includes a second support tube, a portion of which fits into the central through hole of the main iron core, a plurality of second legs are arranged at intervals along the circumference of the second support tube and connected to the outer circumferential surface of the second support tube, and the second support tube is provided with a second through groove for connecting the second radial flow channel and the central through hole.

12. The piston assembly of the magnetorheological damper according to claim 1, characterized in that: The coil support has a first end face and a second end face opposite to each other in the axial direction; The first leg is in contact with the first end surface, and the outer end surface of the first leg is flush with the outer periphery of the first end surface; and / or The second leg is in contact with the second end surface, and the outer end surface of the second leg is flush with the outer periphery of the second end surface.

13. The piston assembly of the magnetorheological damper according to claim 12, characterized in that: A plurality of first slots are provided on the first end surface, and the plurality of first legs are correspondingly disposed in the plurality of first slots; and / or The second end surface is provided with a plurality of second slots, and the plurality of second legs are correspondingly disposed in the plurality of second slots.

14. The piston assembly of the magnetorheological damper according to claim 1, characterized in that: An annular groove is arranged on the outer circumferential surface of the shell, a wear-reducing member is arranged in the annular groove, and the outer circumferential surface of the wear-reducing member is higher than the outer circumferential surface of the shell.

15. A magnetorheological damper, characterized in that: include a cylinder having a first end and a second end; A piston assembly, wherein the piston assembly is a piston assembly of a magnetorheological damper according to any one of claims 1 to 14, wherein 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.

16. The magnetorheological damper according to claim 15, characterized in that: The magnetorheological damper also includes a gas piston, which is movably arranged in the inner cavity of the cylinder along the axial direction of the cylinder to divide the inner cavity of the cylinder into a magnetorheological fluid cavity located on a first side of the gas piston and an air cavity located on a second side of the gas piston. The cylinder is provided with a valve core opening connected to the air cavity, and a valve core assembly is provided at the valve core opening. The piston of the piston assembly is movably arranged in the magnetorheological fluid cavity.

17. The magnetorheological damper according to claim 15, characterized in that: The magnetorheological damper further includes a first connecting member and a second connecting member, wherein the first connecting member is connected to the second end of the piston rod, and the second connecting member is connected to the first end of the cylinder.

18. The magnetorheological damper according to claim 17, characterized in that: The magnetorheological damper further includes a buffer block, which is located between the first connecting member and the second end of the cylinder and is provided on one of the first connecting member, the piston rod and the second end of the cylinder.

19. A vehicle, characterized in that: include: Frame; Suspension; A magnetorheological damper, wherein the magnetorheological damper is the magnetorheological damper according to any one of claims 15 to 17, and the magnetorheological damper is arranged between the frame and the suspension.

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