CN113027978B - Multi-loop asymmetric magnetorheological damper - Google Patents

Abstract

The invention discloses a multi-loop asymmetric magnetorheological damper, which comprises a cylinder, a left end cover and a right end cover which are arranged at two ends of the cylinder, a piston mechanism arranged in the cylinder and a piston rod which is connected with the piston mechanism and can drive the piston mechanism to reciprocate, wherein the piston mechanism is arranged in the cylinder; the piston mechanism comprises a piston assembly, a valve plate assembly and a valve body assembly, wherein the piston assembly, the valve plate assembly and the valve body assembly are sequentially arranged along the axial direction of the cylinder from left to right; the piston rod drives the piston mechanism to reciprocate to form different magnetorheological fluid circulation loops, the magnetorheological damper of the technical scheme solves the requirements that the required damping force range is large and the required force value is different under the compression and recovery working conditions under the limited size requirement, and solves the problems that the force value of a passive vibration damper is difficult to adjust in a large range and the traditional symmetric magnetorheological vibration damper excessively depends on a control algorithm and response time when realizing asymmetric output force.

Description

Multi-loop Asymmetric Magnetorheological Damper

technical field

The invention relates to the field of magnetorheological damping, in particular to a multi-loop asymmetric magnetorheological damper.

Background technique

The damping force of most existing symmetrical magneto-rheological dampers is adjusted by controlling the magnitude of the applied current, and the difference between the restoring force and the compressive force is small. However, when the magnetorheological damper is applied to actual working conditions, there are different requirements for its restoring force and compression force. If the traditional symmetrical magnetorheological damper wants to meet the requirements, it needs to adopt extremely precise active control. And the response time is extremely high, which not only increases the complexity of the system and algorithm, but also greatly increases the cost; in addition, the force value adjustment range of the traditional symmetrical magneto-rheological damper in a limited space Limited, it is difficult to meet the requirements of working conditions.

In order to solve the above problems, it is necessary to design a multi-loop asymmetric magneto-rheological damper that structurally makes the restoring force and compressive force different, and can increase the adjustment range of the damping force value in a limited space.

Contents of the invention

In view of this, in order to improve the compression damping force and restoration damping force of the existing passive shock absorber that cannot be adjusted adaptively, the adjustment range of the damping force of the magneto-rheological damper is increased, and the current traditional symmetrical automotive magneto-rheological damper is overcome. Symmetrical output force is extremely dependent on the control algorithm and response time. This patent invented a multi-ring asymmetric magneto-rheological damper to achieve independent controllability of the output damping force of the compression and recovery strokes.

A multi-loop asymmetric magneto-rheological damper, comprising a cylinder body, left end caps and right end caps disposed at both ends of the cylinder body, a piston mechanism disposed in the cylinder body, and a piston mechanism connected to and capable of driving the piston mechanism to reciprocate The piston rod; the piston mechanism includes a piston assembly, a valve plate assembly, and a valve body assembly arranged in sequence from left to right along the axis of the cylinder; the piston rod drives the piston mechanism to reciprocate to form different The magnetorheological fluid circulation circuit.

Further, the piston assembly includes a piston outer sleeve, a piston block disposed in the piston outer sleeve, and a piston stopper disposed at the left end of the piston outer sleeve; the piston block is provided with a permanent magnet in the circumferential direction; the An excitation coil is wound around the permanent magnet; a magnetic isolation ring is arranged on the outer sleeve of the piston in the circumferential direction; the excitation coil is arranged between the permanent magnet and the magnetic isolation ring.

Further, the piston block is provided with an installation ring groove for installing the permanent magnet in the circumferential direction, and the piston block is provided with a plurality of piston normal through holes axially penetrating the piston block, and the piston block and the piston outer sleeve A first circulation channel for the flow of magnetorheological fluid is formed between them.

Further, the diameter of the outer sleeve of the piston is smaller than the inner diameter of the cylinder, and a second circulation channel for the flow of magnetorheological fluid is formed between the outer sleeve of the piston and the cylinder.

Further, the valve plate assembly includes a valve plate and a compression spring, the diameter of the valve plate is the same as that of the outer sleeve of the piston, and the valve plate is arranged on the right end surface of the piston block so that it can slide axially, and a valve plate hole is arranged on the valve plate and the arc-shaped hole, the valve plate hole is in the same axial direction as the piston normal through hole, and the arc-shaped hole is in the same axial direction as the first circulation channel.

Further, the piston block is threadedly connected with the piston rod, and the piston rod axially penetrates the piston block and is threadedly connected with the valve body assembly.

Further, the valve body assembly includes a left bonnet, a right bonnet, a valve core arranged between the two bonnets, and an outer ring sleeve that is overlaid on the valve core and fitted with the two bonnets; The axial direction protrudes to the left to form a guide installation part for cooperating with the piston block; the guide installation part is a hollow structure and the piston rod is installed in the guide installation part through threaded connection. direction reciprocating sliding, the compression spring is sleeved on the guide installation part and the compression spring is arranged between the valve plate and the left valve cover.

Further, the valve core is fixedly connected with the left and right valve covers, and the two ends of the outer ring cylinder are provided with positioning steps for installing the left and right valve covers; the valve core is provided with a guiding normal through hole , the piston normal through hole and the guide normal through hole are in the same axial direction; a third circulation channel is formed between the valve core and the outer ring cylinder.

Further, a guide groove is opened in the circumferential direction of the outer ring cylinder, and a guide ring is arranged between the guide groove and the inner wall of the cylinder.

Further, a floating piston is arranged between the valve body assembly and the right end cover, and a valve core is arranged on the right end cover.

The beneficial effects of the present invention are:

During the restoration and compression process of the magnetorheological damper of this technical solution, the damping force value of the piston assembly part changes the magnetic field strength by controlling the current, and then changes the yield strength of the magnetorheological fluid in the circulation channel during the restoration or compression process. By changing the magnitude of the damping force, the recovery and compression processes can be controlled separately. The structure is simple, easy to control, and the control algorithm can be greatly simplified; the difference between the recovery force and the compression force can be controlled by the valve plate, and the joint on the valve plate The flow holes can make the change of the force value of the magneto-rheological damper more gentle, and there will be no sudden change; the multi-channel structure can increase the adjustment range of the damping force of the magnetorheological damper in a limited space, so that the The damper can be used in more environments; the piston is equipped with a permanent magnet, which is a protection device for the damper, so that the magneto-rheological damper can function even when there is no current, and avoid device failure. In addition, the valve body assembly at the right end adopts the same structure as the piston assembly, but the damping force value of its recovery and compression process will not be affected by the valve plate, and the damping force value of the valve body assembly part is independently controlled by current, This can further increase the overall force value adjustment range of the magnetorheological damper, and at the same time, the threaded connection of the valve body and the piston rod is in the opposite direction of the threaded connection of the piston and the piston rod, which can play a self-locking role; the valve body assembly The circumferential guide ring also plays a guiding role.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is the schematic diagram of piston block 52 of the present invention;

Fig. 3 is a schematic diagram of the end face of the valve plate of the present invention;

Fig. 4 is the schematic diagram of the end face of the spool of the present invention;

Fig. 5 is a schematic diagram of another structure of the present invention.

Detailed ways

Fig. 1 is a schematic diagram of the overall structure of the present invention; Fig. 2 is a schematic diagram of a piston block 52 of the present invention; Fig. 3 is a schematic diagram of an end face of a valve plate of the present invention; Fig. 4 is a schematic view of a valve core end face of the present invention; Fig. 5 is a schematic view of another structure of the present invention; As shown in the figure, a multi-loop asymmetric magneto-rheological damper includes a cylinder body 4, a left end cover 2 and a right end cover 15 arranged at both ends of the cylinder body 4, a piston mechanism arranged in the cylinder body, and a piston mechanism connected to the cylinder body. The piston rod 1 is connected and arranged to drive the reciprocating movement of the piston mechanism; the piston mechanism includes a piston assembly, a valve plate assembly and a valve body assembly arranged in sequence from left to right along the axis of the cylinder; The piston rod drives the reciprocating motion of the piston mechanism to form different magnetorheological circulation circuits; the magnetorheological damper of this technical solution solves the problem of the limited size requirements, the required damping force range is large, and the required force under compression and recovery conditions The demand for different values overcomes the problems that the force value of the passive vibration damping device is difficult to adjust in a large range and the traditional symmetrical magneto-rheological vibration damping device relies too much on the control algorithm and response time when realizing the asymmetrical output force.

In this embodiment, the piston assembly includes a piston outer sleeve 51, a piston block 5 arranged in the piston outer sleeve 51, and a piston stopper 52 arranged at the left end of the piston outer sleeve 51; direction is provided with a permanent magnet 7; the permanent magnet 7 is wound with an excitation coil; the piston outer sleeve 51 is provided with a magnetic isolation ring 6 in the circumferential direction; the excitation coil is arranged between the permanent magnet 7 and the magnetic isolation Between the rings 6; the piston block 5 has a columnar structure as a whole, and is fixedly installed in the circumferential direction of the piston block 5 (inside and outside, as shown in Figure 1, close to the central axis of the piston block, and outward away from the central axis). The permanent magnet 7, the excitation coil is wound on the outer circumference of the permanent magnet 7, and the magnetic isolation ring 6 is arranged on the outer circumference of the outer sleeve 51 of the plug simultaneously. And the first circulation channel 20 is formed between the magnetic isolation ring 6, the permanent magnet 7, the excitation coil and the magnetic isolation ring 6 are all on the same circumferential direction, and the outer ring of the piston outer sleeve 51 is made of a magnetic material and a magnetic isolation ring 6. It is welded, which can better form the required magnetic circuit; the setting of the permanent magnet 7 can make the damper still play a part of the role in the case of power failure, and play an insurance role. The overall structure is convenient to realize the magneto-rheological damper. Regulatory control.

In this embodiment, the piston block 5 is provided with an installation ring groove for installing the permanent magnet 7 in the circumferential direction, and a plurality of piston normal through holes 21 axially penetrating the piston block are opened on the piston block. A first circulation channel 20 for the flow of magnetorheological fluid is formed between the block 5 and the outer sleeve 51 of the piston. The piston block 5 is provided with a plurality of piston normal through holes 21 to facilitate the flow of the magnetorheological fluid. The holes 21 are designed to be multiple, and the plurality of piston holes 21 are evenly distributed on the piston block 5 .

In this embodiment, the diameter of the piston outer sleeve 51 is smaller than the inner diameter of the cylinder body 4 , and a second annular channel for the flow of magnetorheological fluid is formed between the piston outer sleeve 51 and the cylinder body 4 . A gap is provided between the piston outer sleeve 51 and the cylinder body 4 , and the ring-shaped gap allows the magnetorheological fluid to flow back and forth, thereby forming a second annular channel for the magnetorheological fluid.

In this embodiment, the valve plate assembly includes a valve plate 8 and a compression spring 19. The diameter of the valve plate 8 is the same as that of the piston outer sleeve 51 and the valve plate is arranged on the right end surface of the piston block 5 so that it can slide axially. The valve plate 8 is provided with a valve plate hole and an arc-shaped hole, the valve plate hole is in the same axial direction as the piston normal through hole 21 , and the arc-shaped hole is in the same axial direction as the first circulation channel 20 . The overall length of the arc-shaped hole is smaller than the overall length of the section of the first circulation channel 20 along the radial direction. The piston normal through hole 21 can make the output damping of the damper smoother, and the piston block 52 is also provided with a plurality of through holes correspondingly, that is, the valve plate 8 can be completely attached to the end surface of the piston outer sleeve 51, and the valve plate The arrangement of different lengths between the hole and the arc-shaped hole facilitates the circulation of the magnetorheological fluid when used together.

In this embodiment, the piston block 5 is threaded with the piston rod 1, and the piston rod 1 axially penetrates the piston block 5 and is threaded with the valve body assembly.

In this embodiment, the valve body assembly includes a left bonnet 18, a right bonnet 16, a spool 11 disposed between the two bonnets, and an outer ring that covers the spool 11 and fits with the two bonnets. barrel 9; the valve core 11 protrudes leftward along the axial direction to form a guide installation part for cooperating with the piston block 5; the guide installation part is a hollow structure and the piston rod 1 is installed in the guide installation part through threaded connection, The valve plate 8 can reciprocate and slide along the axial direction of the guide installation part, the compression spring 19 is outside the guide installation part and the compression spring 19 is arranged between the valve plate 8 and the left valve cover 18; the left valve cover 18 and the right valve cover The cover 16 and the outer ring cylinder 9 are installed together to form a cavity; the piston rod 1 and the guide installation part are installed in a threaded manner. The diameter of the guide installation part enables the valve plate 8 to slide along the axial direction of the guide installation part. Permanent magnets and coils are installed on the circumferential direction of the valve core 11. The arrangement of the valve body assembly can increase the effective working length of the entire piston mechanism. Moreover, the damping force of the valve core 11 is not affected by the valve plate 8, but is controlled by the current alone, which can greatly increase the adjustment range of the overall force value of the damper.

In this embodiment, the valve core 11 is fixedly connected with the left valve cover 18 and the right valve cover 16, and the two ends of the outer ring cylinder 9 are provided with positioning holes for installing the left valve cover 18 and the right valve cover 16. step; the spool 11 is provided with a guide normal through hole 17, and the piston normal through hole 21 and the guide normal through hole 17 are in the same axial direction; the diameter of the spool 11 is smaller than the inner diameter of the outer ring cylinder 9, so the two A third circulation channel is formed between them. The guide normal through hole 17 and the piston normal through hole 21 on the piston block 5 have the same function, which can make the output damping of the damper smoother. 18. The right bonnet 16 is installed at the positioning step provided at the end of the spool, and the four form a whole.

In this embodiment, the outer ring cylinder 9 is provided with a guide groove in the circumferential direction, and a guide ring 10 is provided between the guide groove and the inner wall of the cylinder. The guide ring 10 is embedded in the guide groove in the circumferential direction of the outer ring cylinder 9 for guiding the overall structure.

In this embodiment, a floating piston 12 is arranged between the valve body assembly and the right end cover 15, and a valve core 13 is arranged on the right end cover. The right end cover 15 is provided with a connection mount 14 for easy connection and installation with other components. The floating slider 12 and the valve core 13 are used for volume compensation during the working process of the damper. The compensation structure can ensure that the magneto-rheological damper is compressed and restored. There is no sudden change in the damping force value at the turning point, which realizes a smooth transition and makes the equipment run more stably. The cylinder 4 is also provided with a guide seal seat 3, which guides the piston rod 1 and enhances the sealing performance in the cylinder.

working principle:

The valve plate 8 is pressed against the end surface of the piston outer sleeve 51 by a compression spring. A first circulation channel 20 and a piston normal through hole 21 are opened inside the piston assembly, and a second annular channel for the flow of magnetorheological fluid is formed between the piston outer sleeve 51 and the cylinder body 4; During the compression and recovery process, the first circulation channel 20 and the piston normal through hole 21 are opened or closed, and the valve plate 8 has a valve plate hole and an arc-shaped hole, which play a throttling role when the damper is working.

During the compression movement, under the action of liquid pressure and spring force, the valve plate 8 is close to the right side of the piston outer sleeve 51. At this time, the magnetorheological fluid flows from the right chamber to the left chamber, and first passes through the valve body assembly. The guide normal through hole 17 and the third circulation passage, and then pass through the first circulation passage 20 on the piston block 5, the second circulation passage and the piston normal passage hole 21. At this time, due to the throttling effect of the valve plate 8, the first The circulation channel 20 and the piston normal passage 21 are only partially used.

During recovery movement, due to the liquid pressure, the valve plate 8 is separated from the right side of the piston outer sleeve 51, and the valve plate has no throttling effect at this moment. The magnetorheological fluid flows from the left chamber to the right chamber, and first passes through the first circulation channel 20, the second circulation channel and the piston normal hole 21 on the piston assembly, and then passes through the third circulation channel on the valve body assembly And guiding long through hole 17.

In this embodiment, as shown in FIG. 5 , the positions of the valve plate 8 and the compression spring are changed, and they are arranged on the left side of the piston assembly to obtain different damping effects. The two arrangements can be assembled and used according to actual needs.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (4)

1. A multi-loop asymmetric magnetorheological damper is characterized in that: the piston rod is connected with the piston mechanism and can drive the piston mechanism to reciprocate; the piston mechanism comprises a piston assembly, a valve plate assembly and a valve body assembly, wherein the piston assembly, the valve plate assembly and the valve body assembly are sequentially arranged along the axial direction of the cylinder from left to right; the piston rod drives the piston mechanism to reciprocate so as to form different magnetorheological fluid circulation loops; the piston assembly comprises a piston outer sleeve, a piston block arranged in the piston outer sleeve and a piston stop block arranged at the left end of the piston outer sleeve; permanent magnets are arranged in the circumferential direction of the piston block; the permanent magnet is wound with an excitation coil; the piston outer sleeve is provided with a magnetism isolating ring in the circumferential direction; the excitation coil is arranged between the permanent magnet and the magnetism isolating ring; the valve body assembly comprises a left valve cover, a right valve cover, a valve core arranged between the two valve covers and an outer ring cylinder sleeved on the valve core and matched with the two valve covers; the valve core protrudes leftwards along the axial direction to form a guide installation part which is used for being installed with the piston block in a matching mode; the guide mounting part is of a hollow structure, the piston rod is mounted in the guide mounting part through threaded connection, the valve plate can slide in a reciprocating mode in the axial direction of the guide mounting part, the compression spring is sleeved outside the guide mounting part and arranged between the valve plate and the left valve cover; the piston is characterized in that an installation ring groove for installing a permanent magnet is formed in the circumferential direction of the piston block, a plurality of piston constant-temperature through holes axially penetrating through the piston block are formed in the piston block, and a first circulation channel for magnetorheological fluid to flow is formed between the piston block and the outer piston sleeve; the diameter of the outer piston sleeve is smaller than the inner diameter of the cylinder, and a second annular flow channel for flowing of the magnetorheological fluid is formed between the outer piston sleeve and the cylinder; the valve plate assembly comprises a valve plate and a compression spring, the diameter of the valve plate is the same as that of the piston outer sleeve, the valve plate can be arranged on the right end face of the piston outer sleeve in an axially sliding mode, a valve plate hole and an arc-shaped hole are formed in the valve plate, the valve plate hole and the piston constant through hole are in the same axial direction, and the arc-shaped hole and the first circulation channel are in the same axial direction; the valve core is fixedly connected with the left valve cover and the right valve cover, and two ends of the outer ring cylinder are provided with positioning steps for mounting the left valve cover and the right valve cover; the valve core is provided with a guide constant through hole, and the piston constant through hole and the guide constant through hole are in the same axial direction; and a third circulation channel is formed between the valve core and the outer ring cylinder.

2. The multi-loop asymmetric magnetorheological damper of claim 1, wherein: the piston block is in threaded connection with the piston rod, and the piston rod axially penetrates through the piston block and is in threaded connection with the valve body assembly.

3. The multi-loop asymmetric magnetorheological damper of claim 2, wherein: a guide groove is formed in the circumferential direction of the outer ring barrel, and a guide ring is arranged between the inner wall of the barrel and the guide groove.

4. The multi-loop asymmetric magnetorheological damper of claim 3, wherein: a floating piston is arranged between the valve body assembly and the right end cover, and a valve inside is arranged on the right end cover.

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