Magnetorheological piston of partitioned magnetizing coil

Abstract

The magneto-rheological piston comprises a piston outer shell and a magneto-rheological piston body, a magneto-rheological flowing channel is formed between the outer wall of the magneto-rheological piston body and the inner wall of the piston outer shell, and an upper fixing plate and a lower fixing plate are arranged at the two ends of the magneto-rheological piston body respectively. The upper fixing plate and the lower fixing plate are connected to the piston outer shell, a plurality of circulation holes are formed in the circumferential direction of the upper fixing plate and the circumferential direction of the lower fixing plate, the magnetorheological piston comprises a piston body and an electromagnetic coil set, and a non-magnetic isolation layer is arranged on the outer side of the electromagnetic coil set. A non-magnetic circuit flow channel is formed between the surface of the non-magnetic isolation layer and the piston body, and the problems that an existing magnetorheological damper lacks a flow adjusting device for magnetorheological fluid, the damping force of the magnetorheological fluid is still kept at a large level in the low-speed operation process of the piston rod, and the driving and riding comfort is low are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magneto-rheological shock absorber, and particularly relates to a magneto-rheological piston with partitioned magnetizing coils. BACKGROUND

[0002] The magneto-rheological shock absorber is used for responding to road conditions and driving environment in real time based on input information from sensors for monitoring the motion of a vehicle body and wheels. The existing vehicle driving road is basically a cement road or an asphalt road, and the main vibration obstacles are small pits, manhole covers or speed bumps. The greater the damping, the faster the vibration disappears, and the more obvious the vibration feeling. Conversely, the smaller the damping, the longer the time for eliminating the vibration. Therefore, it is necessary to provide small damping force in the low speed section of the shock absorber to improve the ride comfort of the vehicle.

[0003] When the vibration is large, the magneto-rheological shock absorber is controlled by current, has fast response speed, and the upper limit of the damping force is twice that of the hydraulic damper, and the comfort is much higher than that of the hydraulic damper. However, the mass fraction of the magnetic particles in the magneto-rheological fluid is usually between 20% and 40%. Since the composition part contains a certain amount of solid particles, compared with the traditional pure liquid hydraulic damper, the magneto-rheological shock absorber has a basic damping force. In simple terms, when the vibration is small during the low speed operation of the telescopic rod, the comfort of the magneto-rheological shock absorber is lower than that of the traditional hydraulic damper.

[0004] The patent file with the patent number CN202210261194.5 discloses a magneto-rheological fluid shock absorber. The corresponding upper working chamber, lower working chamber and magneto-rheological fluid storage cavity are formed by the cooperation of the piston rod, outer cylinder and working cylinder. The viscosity adjustment and shear force coupling of the magneto-rheological fluid are realized by using the above structure combination and corresponding magneto-rheological control and valve control.

[0005] However, the above-mentioned magneto-rheological shock absorber lacks a flow regulating device for the magneto-rheological fluid. During the low speed operation of the piston rod, the self-damping force of the magneto-rheological fluid still maintains a high level, and the ride comfort is low. Therefore, it is necessary to design a new magneto-rheological piston with partitioned magnetizing coils to achieve the optimization design purpose of simultaneously reducing the low speed damping force and improving the high speed damping force through the partition design of the damping channel. SUMMARY

[0006] The purpose of the present application is to provide a magneto-rheological piston with partitioned magnetizing coils, which aims to improve the problem of large magneto-rheological damping force and poor ride comfort during the low speed motion of the ordinary magneto-rheological piston.

[0007] The application is achieved as follows: a magnetorheological piston with partitioned magnetization coils comprises a piston outer shell and a magnetorheological piston, a magnetorheological flow channel is formed between the outer wall of the magnetorheological piston and the inner wall of the piston outer shell, the magnetorheological piston is provided with an upper fixed plate and a lower fixed plate at two ends respectively, the upper fixed plate and the lower fixed plate are connected to the piston outer shell respectively, and a plurality of flow-through holes are arranged on the circumferences of the upper fixed plate and the lower fixed plate. The magnetorheological piston comprises a piston main body and an electromagnetic coil group, a non-magnetic isolation layer is arranged outside the electromagnetic coil group, and a non-magnetic circuit flow channel is formed between the surface of the non-magnetic isolation layer and the piston main body.

[0008] As an embodiment of the application, the electromagnetic coil group comprises a primary magnetization coil, a secondary magnetization coil and a connecting coil, a vertical groove and two groups of ring grooves are arranged on the side wall of the piston main body, the primary magnetization coil and the secondary magnetization coil are arranged in the two groups of ring grooves respectively, and the connecting coil is arranged in the vertical groove.

[0009] As an embodiment of the application, the thickness of the primary magnetization coil is greater than the thickness of the secondary magnetization coil.

[0010] As an embodiment of the application, the non-magnetic circuit flow channel comprises a primary non-magnetic circuit flow channel and a secondary non-magnetic circuit flow channel, the primary non-magnetic circuit flow channel and the secondary non-magnetic circuit flow channel are in communication with each other, the primary non-magnetic circuit flow channel is composed of the side wall of the vertical groove and the upper surface of the non-magnetic isolation layer arranged in the vertical groove, and the secondary non-magnetic circuit flow channel is composed of the side wall of the ring groove and the upper surface of the non-magnetic isolation layer arranged in the ring groove.

[0011] As an embodiment of the application, the non-magnetic isolation layer is an insulating plastic material, and the non-magnetic isolation layer is wrapped on the electromagnetic coil group.

[0012] As an embodiment of the application, the thickness of the primary non-magnetic circuit flow channel and the secondary non-magnetic circuit flow channel is 2-4 mm.

[0013] As an embodiment of the application, the primary magnetization coil and the secondary magnetization coil are both annular, a primary wire connecting wire is arranged on the primary magnetization coil, and a secondary connecting wire is arranged between the primary magnetization coil and the secondary magnetization coil.

[0014] As an embodiment of the application, the piston main body comprises an upper end and a lower end, the upper end of the piston main body is provided with a piston rod connecting hole, a piston rod is connected to the piston rod connecting hole, a control wire is arranged in the piston rod, and the control wire is connected to a shock absorber control system.

[0015] As one of the embodiments of the present application, the piston body is further provided with a middle connecting channel, which is communicated with the upper end and the lower end.

[0016] As one of the embodiments of the present application, the piston outer shell is provided with a magnetorheological flow channel, and the length of the magnetorheological flow channel is greater than the height of the piston body.

[0017] The present application has the following beneficial effects: 1. The present application increases the flow volume of the magnetorheological fluid by setting the non-magnetic circuit flow channel, the magnetorheological flow channel and the middle connecting channel, so that the magnetorheological damper can provide smaller damping force in the low-speed vibration process, and the comfort effect of the vehicle is improved.

[0018] 2. The present application reduces the low-speed damping force of the piston rod, which is beneficial to reduce the friction and improve the service life of the piston. DETAILED DESCRIPTION

[0019] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and make the other features, objectives and characteristics of the present application more apparent. The schematic embodiment drawings of the present application and their descriptions are used to explain the present application, and do not constitute improper limitation on the present application.

[0020] Figure 1 is the overall schematic diagram of the present application; Figure 2 is the structure diagram of the assembled piston rod of the present application; Figure 3 is the overall sectional schematic diagram of the present application; Figure 4 is the overall schematic diagram of the piston body of the present application; Figure 5 is the sectional view of the piston body of the present application; Figure 6 is the overall schematic diagram of the magnetorheological piston of the present application; Figure 7 is the partial structure enlarged view in Figure 6 Figure 8 is the experimental data diagram of the damping force-piston assembly speed performance curve before improvement; Figure 9 is the experimental data diagram of the damping force-piston assembly speed performance curve of the present application; ​In the figure: piston outer shell 1; magnetorheological flow channel 10; magnetorheological piston 2; non-magnetic flow channel 20; primary non-magnetic flow channel 201; secondary non-magnetic flow channel 202; piston body 21; upper end 211; piston rod connecting hole 2111; lower end 212; middle connecting channel 210; electromagnetic coil group 22; primary magnetizing coil 221; primary connecting wire 2211; secondary magnetizing coil 222; secondary connecting wire 2221; connecting coil 223; non-magnetic isolation layer 23; upper fixed plate 3; lower fixed plate 4; flow hole 40; piston rod 5; control wire 51; annular groove 100; vertical groove 200. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] Example 1, as Figures 1-7 As shown, a magnetorheological piston with a partitioned magnetizing coil includes a piston outer shell 1 and a magnetorheological piston 2. An upper fixing plate 3 and a lower fixing plate 4 are respectively provided at both ends of the magnetorheological piston 2. The upper fixing plate 3 and the lower fixing plate 4 are respectively connected to the piston outer shell 1. A plurality of flow holes 40 are provided in the circumferential direction of the upper fixing plate 3 and the lower fixing plate 4. The magnetorheological piston 2 includes a piston body 21 and an electromagnetic coil group 22. A non-magnetic isolation layer 23 is provided on the outer side of the electromagnetic coil group 22. A non-magnetic flow channel 20 is formed between the surface of the non-magnetic isolation layer 23 and the piston body 21.

[0024] The magnetorheological piston with a partitioned magnetizing coil of the present invention primarily consists of a piston housing 1, a magnetorheological piston 2, and a piston rod 5. The magnetorheological piston 2 is the core component that generates a magnetic field through current control. The piston housing 1 serves as the outer protective layer of the entire magnetorheological piston 2. A magnetorheological flow channel 120 is formed between the outer wall of the magnetorheological piston 2 and the inner wall of the piston housing 1, serving as a flow channel for the magnetorheological fluid.

[0025] like Figures 1-3As shown, the two ends of the magneto-rheological piston 2 are respectively provided with an upper fixed plate 3 and a lower fixed plate 4, after pre-tightening, the upper fixed plate 3 and the lower fixed plate 4 are fixed on the piston outer shell 1 by riveting, and then arranged and fixed; a plurality of flow-through holes 40 are evenly arranged on the circumferences of the upper fixed plate 3 and the lower fixed plate 4, the number of the flow-through holes 40 is four, under the premise of maintaining structural support, the shape of the flow-through holes 40 is as large as possible, mainly to ensure that the magneto-rheological fluid can smoothly flow in the magneto-rheological flow channel 120 between the piston outer shell 1 and the magneto-rheological piston 2.

[0026] As shown in the figure, Figures 3-5 The magneto-rheological piston 2 includes a piston body 21 and an electromagnetic coil group 22, a vertical groove 200 and two groups of ring grooves 100 are arranged on the side wall of the piston body 21. The size of the vertical groove 200 and the ring groove 100 is equal to the size of the electromagnetic coil group 22, the electromagnetic coil group 22 is composed of a primary magnetization coil 221, a secondary magnetization coil 222 and a connecting coil 223, and the primary magnetization coil 221 and the secondary magnetization coil 222 are both annular structures.

[0027] The primary magnetization coil 221 and the secondary magnetization coil 222 are respectively embedded in the two groups of ring grooves 100, and need to be clamped and fixed firmly to prevent loosening during piston movement. The connecting coil 223 is placed in the vertical groove 200, The thickness of the primary magnetization coil 221 is greater than the thickness of the secondary magnetization coil 222, which can provide different magnetic field strengths according to different damping force requirements.

[0028] As shown in the figure, Figures 4-5 The piston body 21 includes an upper end 211 and a lower end 212, a piston rod connecting hole 2111 is arranged on the upper end 211 of the piston body 21, one end of the piston rod 5 is inserted into the piston rod connecting hole 2111, and the piston rod 5 is firmly connected with the piston body 21 by interference fit. A control wire 51 is arranged inside the piston rod 5, the lower end of the control wire 51 is electrically connected with a primary wire connection 2211 arranged on the primary magnetization coil 221 and a secondary connection wire 2221 arranged between the primary magnetization coil 221 and the secondary magnetization coil 222, and the upper end of the control wire 51 is connected with a shock absorber control system, which can control the current size and direction of the electromagnetic coil group 22 in real time, so as to adjust the magnetic field strength.

[0029] In order to further improve the flowability of magneto-rheological fluid, a flow-through side hole 210 is also arranged on the piston body 21, the flow-through side hole 210 communicates the upper end 211 and the lower end 212, the diameter of the flow-through side hole 210 is 5-10mm, which further ensures the flow of magneto-rheological fluid at the upper and lower ends of the piston body 21, improves the flowability of magneto-rheological fluid, reduces the overall damping force of the shock absorber, and improves the comfort of driving and riding.

[0030] AsFigures 5-7 As shown, the non-magnetic isolation layer 23 is made of insulating plastic material, and the non-magnetic isolation layer 23 is wrapped on the electromagnetic coil group 22. The piston body 21 and the electromagnetic coil group 22 are placed in a mold by injection molding, and then the insulating plastic material is injected, and after cooling and solidification, the complete non-magnetic isolation layer 23 is formed. The surface of the non-magnetic isolation layer 23 and the piston body 21 form a non-magnetic flow channel 20, which includes a primary non-magnetic flow channel 201 and a secondary non-magnetic flow channel 202, and the primary non-magnetic flow channel 201 and the secondary non-magnetic flow channel 202 are in communication with each other.

[0031] The primary non-magnetic flow channel 201 is composed of the side wall of the vertical groove 200 and the upper surface of the non-magnetic isolation layer 23 in the vertical groove 200, and the secondary non-magnetic flow channel 202 is composed of the side wall of the ring groove 100 and the upper surface of the non-magnetic isolation layer 23 in the ring groove 100. The thickness of the primary non-magnetic flow channel 201 and the secondary non-magnetic flow channel 202 is controlled to be 2-4mm, which improves the smooth flow of the magnetorheological fluid in the non-magnetic flow channel 20, increases the flowability of the magnetorheological fluid in the low-speed motion state of the piston rod, reduces the overall damping force of the shock absorber, and improves the comfort of the driver and passenger.

[0032] A magnetorheological flow channel 10 is formed on the piston outer shell 1, the length of the magnetorheological flow channel 10 is greater than the height of the piston body 21, and the position and shape of the magnetorheological flow channel 10 are designed according to actual requirements. The magnetorheological flow channel 10 provides a flow channel for the magnetorheological fluid, so that the magnetorheological fluid can flow quickly in the piston outer shell 1, increases the flowability of the magnetorheological fluid in the low-speed motion state of the piston rod, reduces the overall damping force of the shock absorber, and improves the comfort of the driver and passenger.

[0033] As Figure 8 shown, the experimental data and the damping force-piston assembly speed performance curve diagram of the existing magnetorheological shock absorber before improvement, the upper data is the restoring force value, the upward moving resistance; the lower data is the compression force value, the downward moving resistance.

[0034] As Figure 8 can be seen, before improvement, the magnetorheological fluid relies on its own damping force, when the control wire 51 does not input current and the motion speed of the piston rod is +0.0524m / s and-0.0524m / s, the restoring force value is 115.55N, and the compression force value is-172.60N, the damping force is high, and the riding comfort still needs to be improved.

[0035] As Figure 9 described, the experimental data and the damping force-piston assembly speed performance curve diagram of the shock absorber with the improved piston structure of the application, the upper data is the restoring force value, the upward moving resistance; the lower data is the compression force value, the downward moving resistance: AsFigure 9 It can be obtained that, before the improvement, the magnetic rheological fluid relies on its own damping force, when the control wire 51 does not input current, and when the movement speed of the piston rod is +0.0524 m / s and -0.0524 m / s, the restoring force value is 69 N, and the compression force value is -62.70 N, the restoring force value is reduced by 46.55 N, and the resistance reduction ratio is (115.55-69) / 115.55=40.28%.

[0036] The compression force value is reduced by 109.9 N, and the resistance reduction ratio is (-172.60--62.70 N) / -172.60=63.67%.

[0037] In actual application, in the natural running state without power supply, the damping force of the magnetic rheological fluid is greatly reduced in the low-speed movement of the piston rod, the overall comfort of the magnetic rheological shock absorber is improved after the car is vibrated by a small obstacle, and the friction is reduced and the service life of the piston is improved.

[0038] As shown in Figures 8-9 As shown in

[0039] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on that a person skilled in the art can realize it, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist, and it is not within the protection scope of the present application.

[0040] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A magnetorheological piston with a partitioned magnetizing coil, characterized in that: It comprises a piston outer shell (1) and a magnetorheological piston (2), wherein a magnetorheological flow channel (120) is formed between the outer wall of the magnetorheological piston (2) and the inner wall of the piston outer shell (1), an upper fixing plate (3) and a lower fixing plate (4) are respectively provided at both ends of the magnetorheological piston (2), the upper fixing plate (3) and the lower fixing plate (4) are respectively connected to the piston outer shell (1), and a plurality of flow holes (40) are provided on the circumference of the upper fixing plate (3) and the lower fixing plate (4); The magnetorheological piston (2) comprises a piston body (21) and an electromagnetic coil assembly (22), a non-magnetic isolation layer (23) is provided on the outside of the electromagnetic coil assembly (22), and a non-magnetic flow channel (20) is formed between the surface of the non-magnetic isolation layer (23) and the piston body (21).

2. The magnetorheological piston with partitioned magnetizing coils according to claim 1, characterized in that: The electromagnetic coil group (22) includes a main magnetizing coil (221), a secondary magnetizing coil (222) and a connecting coil (223). A vertical groove (200) and two groups of annular grooves (100) are provided on the side wall of the piston body (21). The main magnetizing coil (221) and the secondary magnetizing coil (222) are respectively provided in the two groups of annular grooves (100), and the connecting coil (223) is located in the vertical groove (200).

3. The magnetorheological piston with partitioned magnetizing coils according to claim 2, characterized in that: The thickness of the primary magnetizing coil (221) is greater than the thickness of the secondary magnetizing coil (222).

4. The magnetorheological piston with partitioned magnetizing coils according to claim 3, characterized in that: The non-magnetic flow channel (20) includes a main non-magnetic flow channel (201) and a secondary non-magnetic flow channel (202), wherein the main non-magnetic flow channel (201) and the secondary non-magnetic flow channel (202) are interconnected, wherein the main non-magnetic flow channel (201) is composed of the side wall of the vertical groove (200) and the upper surface of the non-magnetic isolation layer (23) in the vertical groove (200), and the secondary non-magnetic flow channel (202) is composed of the side wall of the annular groove (100) and the upper surface of the non-magnetic isolation layer (23) in the annular groove (100).

5. The magnetorheological piston with partitioned magnetizing coils according to claim 4, characterized in that: The non-magnetic isolation layer (23) is made of insulating plastic material, and the non-magnetic isolation layer (23) is coated on the electromagnetic coil assembly (22).

6. The magnetorheological piston with partitioned magnetizing coils according to claim 5, characterized in that: The thickness of the primary non-magnetic flow channel (201) and the secondary non-magnetic flow channel (202) is 2-4 mm.

7. The magnetorheological piston with partitioned magnetizing coils according to claim 5, characterized in that: The main magnetizing coil (221) and the secondary magnetizing coil (222) are both annular; a main connecting wire (2211) is provided on the main magnetizing coil (221); and a secondary connecting wire (2221) is provided between the main magnetizing coil (221) and the secondary magnetizing coil (222).

8. The magnetorheological piston with partitioned magnetizing coils according to claim 1, characterized in that: The piston body (21) comprises an upper end (211) and a lower end (212). The upper end (211) of the piston body (21) is provided with a piston rod connecting hole (2111). The piston rod connecting hole (2111) is connected to a piston rod (5). A control wire (51) is provided in the piston rod (5), and the control wire (51) is connected to a shock absorber control system.

9. The magnetorheological piston with partitioned magnetizing coils according to claim 8, characterized in that: A middle connecting channel (210) is also provided on the piston body (21), and the middle connecting channel (210) communicates with the upper end (211) and the lower end (212).

10. The magnetorheological piston with partitioned magnetization coils according to claim 9, characterized in that: A magnetorheological flow channel (10) is provided on the piston outer shell (1), and the length of the magnetorheological flow channel (10) is greater than the height of the piston body (21).

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