Self-adaptive dual-channel magnetorheological damper with wide adjusting range

Abstract

The invention discloses a self-adaptive double-channel magneto-rheological damper with a wide adjusting range, and belongs to the technical field of automobile suspension systems, the self-adaptive double-channel magneto-rheological damper comprises a self-adaptive double-channel piston assembly, a working cylinder assembly, a compensation piston assembly and a guide assembly, the self-adaptive double-channel piston assembly internally comprises a normally-open main channel, and the working cylinder assembly is arranged in the working cylinder assembly; and the self-adaptive auxiliary channel is guided by a one-way mechanism, and a coil winding is arranged between the two channels to realize synchronous control. When the self-adaptive double-channel piston assembly is forced to vibrate, channel flow distribution can be adjusted in a self-adaptive mode according to the magnitude of generated fluid damping force, then the impact resistance of the damper is improved, the damping force adjusting range of the damper is widened, and an excitation magnetic field generated by the coil winding can perpendicularly penetrate through the main channel and the auxiliary channel at the same time; and the magnetic field utilization rate is effectively improved. The method can be applied to vehicle suspensions of different types of vehicles, and the riding comfort and the control stability of the vehicle are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile suspension systems, and in particular relates to an adaptive dual-channel magnetorheological damper with a wide adjustment range. Background Art

[0002] With the continuous development of automobile suspension systems, the performance requirements of vehicles for suspension dampers are increasing, especially in the two contradictory aspects of ride comfort and handling stability. As an efficient damping control device, magnetorheological dampers have the advantages of high response speed, simple structure, and high robustness. They have been widely used in automobile suspension systems and provide relatively ideal dynamic response control for automobile suspension systems. However, there are still several technical bottlenecks in the practical application of existing magnetorheological dampers. Due to design limitations, the damping force adjustment range of traditional magnetorheological dampers is greatly limited, resulting in insufficient adjustment ability for handling stability. When the magnetorheological damper is subjected to instantaneous large displacement or impact load during high-speed impact, the flow rate of the magnetorheological fluid flowing through the damper increases rapidly, resulting in a sharp increase in the fluid pressure difference, which causes the minimum damping force (zero-field damping force) to be too large. The excessive minimum damping force may be directly transmitted to the passengers, resulting in a significant decrease in the ride comfort of the car under impact conditions. This limitation makes the existing dampers unable to adapt to the complex and changeable vibration requirements under different driving conditions, affecting the overall comfort and handling stability of the vehicle.

[0003] Among the existing technical solutions, the main methods used are to expand the channel cross-sectional area or adopt a multi-channel approach to reduce the minimum damping force under impact conditions. However, these solutions will also reduce the maximum damping force of the magnetorheological damper, thereby affecting its adjustment range of handling stability, which is not conducive to improving the overall performance of the suspension; and the method of using an electronically controlled valve to increase the adjustment range of handling stability will significantly increase the system cost and increase the control difficulty of the system, thereby affecting the robustness of the suspension system. Summary of the invention

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: an adaptive dual-channel magnetorheological damper with a wide adjustment range, comprising: an adaptive dual-channel piston assembly, a working cylinder assembly, a compensating piston assembly and a guide assembly, wherein the outer cylinder guide belt of the adaptive dual-channel piston assembly forms a coaxial matching relationship with the inner wall of the working cylinder assembly through surface contact, so that the adaptive dual-channel piston assembly is arranged in the chamber inside the working cylinder 39 of the working cylinder assembly. In the upper chamber inside the working cylinder and above the adaptive dual-channel piston assembly, the piston rod of the adaptive dual-channel piston assembly coaxially passes through the guide assembly to realize the radial multi-degree-of-freedom constraint of the piston rod, and in the lower chamber below the adaptive dual-channel piston assembly, a compensating piston assembly coaxial with the adaptive dual-channel piston assembly is arranged; the compensating piston assembly divides the lower chamber into two chambers, wherein the chamber below the compensating piston assembly constitutes a volume compensation chamber; the adaptive dual-channel piston assembly comprises a damping main channel, a damping auxiliary channel and a coil winding, and the synchronous control of the damping main channel and the damping auxiliary channel is realized by the arrangement of the coil winding.

[0005] The present invention has the following beneficial effects: the adaptive dual-channel magnetorheological damper with a wide adjustment range of the present invention includes an adaptive dual-channel piston assembly, which adds an adaptively adjustable damping auxiliary channel on the basis of the piston assembly of the traditional magnetorheological damper, so that the magnetorheological damper can adaptively adjust the channel flow distribution according to the size of the fluid damping force. The dual-channel magnetorheological damper of the present invention has a dual-channel pressure relief function when the damping force is small, thereby increasing the effective cross-sectional area of ​​the channel to reduce the flow-induced pressure difference (fluid pressure difference), thereby reducing the minimum damping force of the magnetorheological damper; it can also lock the auxiliary channel when the damping force is large, forming a single-channel flow aggregation, and improving the maximum damping force of the magnetorheological damper. Correspondingly, the setting of the coil winding of the present invention can realize the synchronous control of the damping main channel and the damping auxiliary channel, and the coordinated work of the dual-channel structure and the coil winding makes the damper have an adaptive wide adjustment range, so as to improve the ride comfort and handling stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1It is an axial side cross-sectional view of an adaptive dual-channel magnetorheological damper with a wide adjustment range of the present invention, wherein: 1-floating compensation piston, 2-compensation piston guide belt, 3-bottom end cover, 4-first positioning pin, 5-second positioning pin, 6-lower magnetic conductive plate, 7-first plug guide belt, 8-first coil spring, 9-insulating cover layer, 10-second coil spring, 11-upper magnetic conductive plate, 12-second plug guide belt, 13-piston inner core, 14-piston rod O-ring, 15-shaft retaining ring, 16-external lead, 17-magnetorheological fluid, 18-nylon buffer pad, 19- Guide skeleton, 20-guide bushing, 21 first retaining spring, 22-skeleton O-ring, 23-first skeleton oil seal, 24-second skeleton oil seal, 25-second retaining spring, 26-piston rod, 27-retaining ring gasket, 28-top end cover, 29-second one-way plug, 30-coil winding, 31-coil skeleton, 32-lead plug, 33-first one-way plug, 34-outer tube guide belt, 35-wire groove, 36-guide outer tube, 37-winding lead, 38-compensating piston O-ring, 39-working cylinder barrel, 40-cover, 41-lifting ear, 42-sleeve;

[0007] Figure 2 It is a bottom view and a cross-sectional view at two angles of the adaptive dual-channel piston assembly of the present invention, wherein 3-bottom end cover, 4-first positioning pin, 5-second positioning pin, 6-lower magnetic conductive plate, 11-upper magnetic conductive plate, 13-piston inner core, 14-piston rod O-ring, 15-shaft retaining ring, 16-external lead, 26-piston rod, 27-retaining ring pad, 28-top end cover, 30-coil winding, 31-coil skeleton, 32-lead plug, 34-outer cylinder guide belt, 35-wire groove, 36-guide outer cylinder, 37-winding lead, 301-inner annular channel groove, 302-outer annular channel groove, 303-annular positioning boss, 304-extended boss;

[0008] Figure 3 It is a front view and multi-angle cross-sectional view of the piston inner core and related parts of the present invention, wherein, 7-first plug guide band, 8-first coil spring, 10-second coil spring, 12-second plug guide band, 13-piston inner core, 29-second one-way plug, 33-first one-way plug, 305-inner ring platform, 306-outer ring platform, 307-first annular channel groove, 308-second annular channel groove;

[0009] Figure 4It is a structural cross-sectional view of the adaptive dual-channel piston assembly of the present invention when working in a state of low damping force, wherein 3-bottom end cover, 7-first plug guide belt, 8-first coil spring, 10-second coil spring, 12-second plug guide belt, 13-piston inner core, 28-top end cover, 29-second one-way plug, 33-first one-way plug, 307-first annular channel groove, 308-second annular channel groove;

[0010] Figure 5 It is a structural cross-sectional view of the auxiliary flow channel in the adaptive dual-channel piston assembly of the present invention when working in a state of large damping force, wherein 3-bottom end cover, 7-first plug guide strip, 8-first coil spring, 10-second coil spring, 12-second plug guide strip, 13-piston inner core, 28-top end cover, 29-second one-way plug, 33-first one-way plug, 308-second annular channel groove;

[0011] Figure 6 It is a structural cross-sectional view of the auxiliary flow channel in the adaptive dual-channel piston assembly of the present invention when working under a moderate damping force state, wherein 3-bottom end cover, 7-first plug guide strip, 8-first coil spring, 10-second coil spring, 12-second plug guide strip, 13-piston inner core, 28-top end cover, 29-second one-way plug, 33-first one-way plug, 308-second annular channel groove. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0013] The adaptive dual-channel magnetorheological damper with a wide adjustment range of the present invention includes an adaptive dual-channel piston assembly. The adaptive dual-channel piston assembly adds an adaptively adjustable damping auxiliary channel on the basis of the piston assembly of the traditional magnetorheological damper, so that the magnetorheological damper can adaptively adjust the channel flow distribution according to the size of the fluid damping force. The dual-channel magnetorheological damper of the present invention has a dual-channel pressure relief function when the damping force is small, thereby increasing the effective cross-sectional area of ​​the channel to reduce the flow-induced pressure difference (fluid pressure difference), thereby reducing the minimum damping force of the magnetorheological damper; it can also lock the auxiliary channel when the damping force is large, forming a single-channel flow aggregation, and improving the maximum damping force of the magnetorheological damper. Correspondingly, the setting of the coil winding of the present invention can realize the synchronous control of the damping main channel and the damping auxiliary channel. The coordinated work of the dual-channel structure and the coil winding enables the damper to have an adaptive wide adjustment range, so as to improve the ride comfort and handling stability of the vehicle.

[0014] like Figure 1 As shown, the present invention provides an adaptive dual-channel magnetorheological damper with a wide adjustment range, comprising an adaptive dual-channel piston assembly, a working cylinder assembly, a compensating piston assembly and a guide assembly, wherein the outer cylinder guide belt 34 of the adaptive dual-channel piston assembly forms a coaxial matching relationship with the inner wall of the working cylinder assembly through surface contact, so that the adaptive dual-channel piston assembly is arranged in a chamber inside the working cylinder 39 of the working cylinder assembly. In the upper chamber inside the working cylinder 39 and above the adaptive dual-channel piston assembly, the piston rod 26 of the adaptive dual-channel piston assembly coaxially passes through the guide assembly to realize the radial multi-degree-of-freedom constraint of the piston rod 26, and in the lower chamber below the adaptive dual-channel piston assembly, a compensating piston assembly coaxial with the adaptive dual-channel piston assembly is arranged; the compensating piston assembly divides the lower chamber into two chambers, wherein the chamber below the compensating piston assembly constitutes a volume compensation chamber.

[0015] The components of the assembly are as follows:

[0016] Working cylinder assembly: includes bushing 42, lifting ear 41, cover 40 and working cylinder 39. Among them, the lifting ear 41 is coaxially installed in the bushing 42 and welded to the bottom of the cover 40, and the cover 40 is fixed to the bottom of the working cylinder 39 by gas welding.

[0017] The compensating piston assembly includes a floating compensating piston 1, a compensating piston O-ring 38 and a compensating piston guide band 2. The compensating piston O-ring 38 and the compensating piston guide band 2 are installed in corresponding grooves on the floating compensating piston 1.

[0018] Guide assembly: includes guide frame 19, first frame oil seal 23, second frame oil seal 24, first retaining spring 21, second retaining spring 25, frame O-ring 22, guide bushing 20 and nylon buffer pad 18. Among them, guide bushing 20 is installed between first frame oil seal 23 and guide frame 19, first frame oil seal 23 and second frame oil seal 24 are respectively fixed to the stepped groove of guide frame 19 through first retaining spring 21 and second retaining spring 25, frame O-ring 22 is installed to the groove outside guide frame 19, and nylon buffer pad 18 is fixed to the groove at the bottom of guide frame 19 through the boss structure at the top.

[0019] Adaptive dual-channel piston assembly: including a bottom end cover 3, a top end cover 28, a piston core 13, a lower magnetic conductive plate 6, a first locating pin 4, a second locating pin 5, a coil skeleton 31, an upper magnetic conductive plate 11, a coil winding 30, a piston rod 26, a piston rod O-ring 14, a shaft retaining ring 15, a retaining ring gasket 27, a guide outer cylinder 36, an outer cylinder guide band 34, a first coil spring 8, a second coil spring 10, a first plug guide band 7, a second plug guide band 12, a first one-way plug 33, a second one-way plug 29, a winding lead 37, a wire groove 35, a lead plug 32, an outer lead 16, and an insulating covering layer 9.

[0020] The following is an explanation of the composition structure and working mode of the adaptive dual-channel piston assembly.

[0021] like Figure 2 As shown, the adaptive dual-channel piston assembly includes: a guide outer cylinder 36, a piston inner core 13, a lead plug 32, a piston rod 26, a bottom end cover 3, a top end cover, and a coil skeleton 31. In the guide outer cylinder 36, the piston inner core 13 is the main body, the lead plug 32 is fixed in the groove at the bottom end of the piston inner core 13, the piston rod 26 is arranged in the groove at the top end of the piston inner core 13, the bottom end cover 3 is coaxially arranged on the lower end surface of the piston core 13, the lower magnetic conductive plate 6 is coaxially arranged on the upper end surface of the bottom end cover 3, and the coil skeleton 31 is coaxially arranged in the fixed groove on the inner surface of the lower magnetic conductive plate 6 and the upper magnetic conductive plate 11 for connecting the two; the bottom end of the guide outer cylinder 36 is fixed to the bottom end cover 3 through the external thread of the bottom end cover 3, the bottom end of the guide outer cylinder 36 is fixed to the bottom end cover 3 through the external thread of the bottom end cover 3, and the top end of the guide outer cylinder 36 is fixed to the top end cover 28 through the external thread of the top end cover 28, and can also be fixed in other ways. The guide outer cylinder 36, the bottom end cover 3, and the top end cover 28 are assembled as described above to lock the internal parts of the adaptive dual-channel piston assembly.

[0022] Among them, the bottom end cover 3 is provided with two groups of inner and outer annular channel grooves distributed circumferentially: an inner annular channel groove 301 and an outer annular channel groove 302. Since the material of the bottom end cover 3 is not magnetically conductive, the magnetic field has no obvious regulating effect on the magnetorheological fluid 17 flowing through the two groups of annular channel grooves of the bottom end cover 3. Therefore, the outer annular channel groove 302 requires a larger groove width to further reduce the minimum damping force of the damper, and in order to realize the adaptive locking function of the auxiliary channel, the inner annular channel groove 301 requires a smaller groove width to ensure that the channel can be completely locked. Therefore, the groove width of the outer annular channel groove 302 is set to be larger than the gap width of the main channel of the damper, and the groove width of the inner annular channel groove 301 is smaller than the gap width of the auxiliary channel of the damper. An annular positioning boss is provided on the upper end face of the bottom end cover 3, and the inner annular channel groove 301 penetrates the annular positioning boss 303 to ensure the coaxial assembly relationship between the piston inner core 13, the lower magnetic conductive plate 6 and the upper magnetic conductive plate 11; an extended boss 304 is provided on the lower end face of the bottom end cover 3, and a wrench groove is provided on the outer circumferential surface of the extended boss 304 to facilitate the assembly of the thread. In addition, two positioning pin holes are provided on the upper end face between the two groups of annular channel grooves to prevent the winding lead 37 from being cut off due to relative rotation during movement, and a wire hole and a buried wire groove are provided at the opposite position of the upper end face of the bottom end cover 3 and the horizontal connection line of the two positioning pin holes, which are used to lead out the winding lead 37. The top end cover 28 and the bottom end cover 3 are provided with two groups of inner and outer annular channel grooves, annular positioning bosses and extended bosses with the same structure and function. The piston inner core 13 and the lower magnetic conductive plate 6 are positioned respectively by the inner and outer surfaces of the annular positioning boss 303 of the bottom end cover 3 and the first positioning pin 4 and the second positioning pin 5; the upper end surface of the lower magnetic conductive plate 6, the lower end surface of the upper magnetic conductive plate 11 and the outer circumferential surface of the coil skeleton 31 axially arranged between the lower magnetic conductive plate 6 and the upper magnetic conductive plate 11 form a winding groove, and the coil winding 30 is wound in the aforementioned winding groove. The combination of the lower magnetic conductive plate 6, the upper magnetic conductive plate 11, the coil skeleton 31 and the coil winding 30 serves as a magnetic circuit control component, wherein the coil skeleton 31 is not manufactured as an integral part with the lower magnetic conductive plate 6 and the upper magnetic conductive plate 11, and the coil skeleton 31 is made of non-magnetic conductive material to reduce magnetic leakage of the magnetic circuit.

[0023] Similarly, the shaft retaining ring 15 and the piston rod O-ring 14 are positioned respectively by the inner and outer surfaces of the annular positioning boss of the top end cover 28. The piston rod O-ring 14 and the shaft retaining ring 15 are respectively arranged in grooves at different positions of the piston rod 26 in the circumferential direction and in the axial lower and upper directions (the piston rod O-ring 14 is in the axial lower part, and the shaft retaining ring 15 is in the axial upper part), and are respectively used for sealing the piston inner core 13 and limiting the piston rod 26; the retaining ring pad 27 is arranged on the radial inner surface of the top end cover 28 and extends to contact the shaft retaining ring 15; the bottom end cover 3 and the top end cover 28 are respectively fixed to the bottom and top of the guide outer cylinder 36 by threads or other means, and the outer cylinder guide belt 34 is arranged in the guide groove on the outer surface of the guide outer cylinder 36.

[0024] like Figure 2 As shown, the outer surface of the magnetic circuit regulating component and the inner surface of the guide outer cylinder 36 form a main channel of the damper, and the position of the main channel of the damper corresponds to the outer annular channel groove of the bottom end cover 3 and the top end cover 28; the inner surface of the magnetic circuit regulating component and the outer surface of the piston inner core 13 form an auxiliary channel of the damper, and the position of the auxiliary channel of the damper corresponds to the inner annular channel groove of the bottom end cover 3 and the top end cover 28.

[0025] like Figure 2 and Figure 3 As shown, the radial middle part and circumferential outer surface of the piston inner core 13 are provided with a double-stage fixed ring platform, the double-stage fixed ring platform includes an inner ring platform 305 and an outer ring platform 306, the inner ring platform 305 is provided with a plurality of circumferentially distributed first annular channel grooves 307, and the outer ring platform 306 is provided with a plurality of circumferentially distributed second annular channel grooves 308, wherein the first annular channel groove 307 is provided to ensure that the magnetorheological fluid 17 can smoothly flow through the middle position of the damper auxiliary channel under any circumstances, and the second annular channel groove 308 is provided to allow more fluid pressure to act on the first one-way plug 33 and the second one-way plug 29, so as to facilitate the damping. To lock the auxiliary channel of the damper, the first coil spring 8 and the second coil spring 10 are respectively fixed to the upper and lower end surfaces of the outer ring platform; the first one-way plug 33 and the second one-way plug 29 are respectively fixed to the other side of the unfixed outer ring platform of the first coil spring 8 and the second coil spring 10, and a plurality of circumferentially distributed annular channel grooves are correspondingly arranged on the axial projection position of the first annular channel groove 307 of the inner ring platform 305 of the first one-way plug 33 and the second one-way plug 29. At this time, even if the first one-way plug 33 and the second one-way plug 29 are in contact with the two-stage fixed ring platform of the piston inner core 13, the circulation of the magnetorheological fluid 17 can be guaranteed. In addition, the first annular channel groove 307 has no intersection area with the inner annular channel grooves of the bottom end cover 3 and the top end cover 28, so that the auxiliary channel is locked when the first one-way plug 33 or the second one-way plug 29 contacts the bottom end cover 3 or the top end cover 28; the first plug guide band 7 and the second plug guide band 12 are respectively arranged in the circumferential outer guide grooves of the first one-way plug 33 and the second one-way plug 29.

[0026] Among them, the functions of the inner and outer channels of the present invention can be interchanged, that is, the outer channel can be used as the auxiliary channel of the damper, and the inner channel can be used as the main channel of the damper. At this time, the double-stage fixed ring platform needs to be set on the inner surface of the guide outer cylinder 36, and other settings are adjusted accordingly to achieve the interchange of the damper main channel and the damper auxiliary channel. The coil winding 30 is led out to the outside through two winding leads 37. The two winding leads 37 pass through two wire holes in the wire groove 35 made of insulating material on the lower magnetic plate 6, and then pass through the wire holes of the bottom end cover 3 to the lower end surface of the bottom end cover 3, and then pass through the buried wire groove on the lower end surface of the bottom end cover 3 and weld to the metal connecting fork at the lower end of the lead plug 32, and finally pass through the outer lead 16 at the upper end of the lead plug 32 through the inner middle through hole of the piston rod 26 to the outside of the damper; the coil winding 30 and the winding lead 37 are covered with insulating material to ensure that the coil winding 30 and the winding lead 37 will not be short-circuited or cut off.

[0027] like Figure 4 As shown, when the adaptive dual-channel piston assembly is stimulated by downward displacement, the damper enters the compression stroke, and the fluid pressure pushes the first one-way plug 33 and the second one-way plug 29 to move upward, that is, the first coil spring 8 is compressed and the second coil spring 10 is stretched. In the case where no magnetic field excitation is applied to the adaptive dual-channel piston assembly, the damper outputs the minimum damping force value. At this time, the fluid pressure of the magnetorheological fluid 17 is small, so the stretching stroke of the second coil spring 10 is not enough to make the second one-way plug 29 contact with the top end cover 28, and the compression stroke of the first coil spring 8 is not enough to make the first one-way plug 33 contact with the two-stage fixed ring on the piston inner core 13 or cause the first coil spring 8 to be completely coiled. At this time, the auxiliary channel of the damper flows normally, the first annular channel groove 307 and the second annular channel groove 308 are both open, and the adaptive dual-channel piston assembly works in the form of dual-channel pressure relief, which can obtain a larger effective channel cross-sectional area, thereby reducing the minimum damping force value of the damper.

[0028] like Figure 5 As shown, when the maximum magnetic field excitation is applied to the damper, the damper outputs the maximum damping force value. The fluid pressure at this time is relatively large, so the stretching stroke of the second coil spring 10 can make the second one-way plug 29 contact with the top end cover 28, locking the auxiliary channel of the damper. At this time, the adaptive dual-channel piston assembly works in the form of single-channel flow aggregation, so a smaller channel effective cross-sectional area can be obtained, thereby increasing its maximum damping force value.

[0029] like Figure 6As shown, when a lower magnetic field excitation is applied to the damper, the stretching stroke of the second coil spring 10 may be insufficient to make the second one-way plug 29 contact with the top end cover 28, but the compression stroke of the first coil spring 8 will make the first one-way plug 33 contact with the two-stage fixed ring stage on the piston inner core 13 or cause the first coil spring 8 to be completely coiled. At this time, since the second channel groove 308 of the outer ring stage of the piston inner core 13 will be locked, the channel groove on the inner ring stage can still flow normally, and therefore will not affect the normal working state of the dual-channel pressure relief.

[0030] In the present invention, when the adaptive dual-channel piston assembly is stimulated by upward displacement, the damper enters the stretching section stroke, and the working principle at this time is exactly the same as that of the compression section, so the damper can achieve a two-way expansion of the adjustment range.

[0031] The present invention provides an adaptive dual-channel magnetorheological damper with a wide adjustment range, wherein the adaptive dual-channel piston assembly includes two damping channels: a normally open main channel, and an adaptive auxiliary channel related to the damping force formed by an elastic element and a one-way plug, and a coil winding is arranged between the two channels to realize dual-channel synchronous control. When the adaptive dual-channel piston assembly is forced to vibrate, the present invention can adaptively adjust the channel flow distribution according to the magnitude of the fluid damping force generated, reduce the minimum damping force of the magnetorheological damper by dual-channel pressure relief when the damping force is small, and increase the maximum damping force of the magnetorheological damper by single-channel flow aggregation when the damping force is large, thereby improving the shock resistance of the damper and the adjustment range of the damping force. In addition, the excitation magnetic field generated by the coil winding arranged between the two damping channels can vertically pass through the main and auxiliary channels at the same time, effectively improving the utilization rate of the magnetic field. The present invention can be widely used in vehicle suspensions of different models to improve the ride comfort and handling stability of the vehicle.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An adaptive dual-channel magnetorheological damper with a wide adjustment range, characterized in that: include: An adaptive dual-channel piston assembly, a working cylinder assembly, a compensating piston assembly and a guide assembly, wherein the outer tube guide belt (34) of the adaptive dual-channel piston assembly forms a coaxial matching relationship with the inner wall of the working cylinder assembly through surface contact, so that the adaptive dual-channel piston assembly is arranged in a chamber inside the working cylinder (39) of the working cylinder assembly; in an upper chamber inside the working cylinder (39) and above the adaptive dual-channel piston assembly, a piston rod (26) of the adaptive dual-channel piston assembly coaxially passes through the guide assembly to realize radial multi-degree-of-freedom constraint of the piston rod (26); in a lower chamber below the adaptive dual-channel piston assembly, a compensating piston assembly coaxial with the adaptive dual-channel piston assembly is arranged; the compensating piston assembly divides the lower chamber into two chambers, wherein the chamber below the compensating piston assembly constitutes a volume compensation chamber; the adaptive dual-channel piston assembly comprises a damping main channel, a damping auxiliary channel and a coil winding, and synchronous control of the damping main channel and the damping auxiliary channel is realized by setting the coil winding.

2. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 1, characterized in that: The adaptive dual-channel piston assembly comprises: a guide outer cylinder (36), a piston inner core (13), a lead plug (32), a piston rod (26), a bottom end cover (3), a top end cover (28) and a coil frame (31); in the guide outer cylinder (36), the piston inner core (13) is the main body, the lead plug (32) is fixed in a groove at the bottom end of the piston inner core (13), the piston rod (26) is arranged in a groove at the top end of the piston inner core (13), the bottom end cover (3) is coaxially arranged on the lower end surface of the piston core (13), the lower magnetic conductive plate (6) is coaxially arranged on the upper end surface of the bottom end cover (3), and the coil frame (31) is coaxially arranged in a fixed groove on the inner surface of the lower magnetic conductive plate (6) and the upper magnetic conductive plate (11), and is used to connect the lower magnetic conductive plate (6) and the upper magnetic conductive plate (11); the bottom end of the guide outer cylinder (36) is fixed to the bottom end cover (3), and the top end is fixed to the top end cover (28).

3. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 2, characterized in that: The bottom end cover (3) comprises an inner annular channel groove (301) and an outer annular channel groove (302), wherein the groove width of the outer annular channel groove (302) is greater than the gap width of the damper main channel, and the groove width of the inner annular channel groove (301) is less than the gap width of the damper auxiliary channel; an annular positioning boss (303) is provided on the upper end surface of the bottom end cover (3), and the inner annular channel groove (301) passes through the annular positioning boss (303); an extended boss (304) is provided on the lower end surface of the bottom end cover (3); two positioning pin holes are provided on the upper end surface between the inner annular channel groove (301) and the outer annular channel groove (302) to prevent the winding lead wire (37) from being moved during movement. The piston (13) and the lower magnetic plate (6) are respectively positioned by the inner and outer surfaces of the annular positioning boss 303 of the bottom end cover (3) and the first positioning pin (4) and the second positioning pin (5), and the piston (13) and the upper magnetic plate (11) are respectively positioned by the inner and outer surfaces of the annular positioning boss 303 of the top end cover (28) and the inner and outer surfaces of the annular positioning boss 303 of the bottom end cover (3) and the first positioning pin (4) and the second positioning pin (5).

4. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 3, characterized in that: The upper end surface of the lower magnetic conductive plate (6), the lower end surface of the upper magnetic conductive plate (11), and the outer circumferential surface of the coil frame (31) axially arranged between the lower magnetic conductive plate (6) and the upper magnetic conductive plate (11) form a winding groove, and the coil winding (30) is wound in the winding groove; the combination of the lower magnetic conductive plate (6), the upper magnetic conductive plate (11), the coil frame (31) and the coil winding (30) serves as a magnetic circuit control component; the coil frame (31) is not manufactured as an integral part with the lower magnetic conductive plate (6) and the upper magnetic conductive plate (11), and the coil frame (31) is made of non-magnetic conductive material to reduce magnetic leakage of the magnetic circuit.

5. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 2, characterized in that: The shaft retaining ring (15) and the piston rod O-ring (14) are respectively arranged in grooves at different circumferential positions on the lower part of the piston rod (26) and at different axial positions, and are respectively used for sealing the piston inner core (13) and limiting the piston rod (26); the retaining ring gasket (27) is arranged on the radial inner surface of the top end cover (28) and extends to contact the shaft retaining ring (15).

6. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 4, characterized in that: An outer channel formed by the outer surface of the magnetic circuit regulating component and the inner surface of the guide outer cylinder (36) serves as the main channel of the damper, and the position of the main channel of the damper corresponds to the outer annular channel grooves of the bottom end cover (3) and the top end cover (28); an inner channel formed by the inner surface of the magnetic circuit regulating component and the outer surface of the piston inner core (13) serves as the auxiliary channel of the damper, and the position of the auxiliary channel of the damper corresponds to the inner annular channel grooves of the bottom end cover (3) and the top end cover (28).

7. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 2, characterized in that: A double-stage fixed ring platform is provided in the radial middle part and the circumferential outer surface of the piston inner core (13), and the double-stage fixed ring platform comprises an inner ring platform (305) and an outer ring platform (306). The inner ring platform (305) is provided with a plurality of circumferentially distributed first annular channel grooves (307), and the outer ring platform (306) is provided with a plurality of circumferentially distributed second annular channel grooves (308). The first coil spring (8) and the second coil spring (10) are respectively fixed to the upper and lower end surfaces of the outer ring platform; the first one-way plug (33) and the second one-way plug (29) are respectively fixed to the first coil spring (8) and the outer ring platform. A plurality of circumferentially distributed annular channel grooves are correspondingly arranged on the other side of the unfixed outer ring platform of the second coil spring (10) and at the axial projection positions of the first annular channel groove (307) of the inner ring platform (305) of the first one-way plug 33 and the second one-way plug (29); the first annular channel groove (307) has no intersection area with the inner annular channel grooves of the bottom end cover (3) and the top end cover (28); and the first plug guide band (7) and the second plug guide band (12) are respectively arranged in the circumferential outer guide grooves of the first one-way plug (33) and the second one-way plug (29).

8. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 6, characterized in that: The outer channel is used as the auxiliary channel of the damper, the inner channel is used as the main channel of the damper, a double-stage fixed ring stage is arranged on the inner surface of the guide outer cylinder (36), and other settings are adjusted accordingly, so as to realize the interchange of the main channel of the damper and the auxiliary channel of the damper.

9. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 1, characterized in that: The coil winding (30) is led out to the outside through two winding lead wires (37). The two winding lead wires (37) respectively pass through two wire holes in a wire groove (35) made of insulating material on the lower magnetic conductive plate (6), then pass through the wire holes of the bottom end cover (3) to the lower end surface of the bottom end cover (3), then pass through the buried wire groove on the lower end surface of the bottom end cover (3) and are welded to the metal connecting fork foot at the lower end of the lead plug (32), and finally pass through the external lead wire (16) at the upper end of the lead plug (32) and through the inner middle through hole of the piston rod (26) to the outside of the damper.

10. The adaptive dual-channel magnetorheological damper with a wide adjustment range according to claim 9, characterized in that: The coil winding (30) and the winding lead wire (37) are both covered with insulating material to ensure that the coil winding (30) and the winding lead wire (37) will not be short-circuited or cut off.

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