Magnetorheological damper with bent magnetic circuit

Abstract

The invention discloses a magnetorheological damper with a bent magnetic circuit. The magnetorheological damper is characterized by comprising a working cylinder body, a first end cover, a second end cover, a piston end cover, a magnetic conducting ring, a magnetic isolating ring, a sealing ring, a piston rod and a coil. The piston divides the interior of the cylinder body into two cavities, the cavities are filled with magnetorheological fluid, when the piston rod moves up and down, the magnetorheological fluid alternately flows back and forth in the two cavities through a damping channel in the piston, in the process, the magnetorheological fluid cuts magnetic induction lines generated by the coil so as to generate damping force, and when the magnitude of current in the coil is changed, the damping force is generated. And the damping force is also changed. A winding magnetic circuit is formed by a magnetic field generated after the coil is powered on under the action of the magnetism isolating ring and the magnetism conducting ring, so that the utilization efficiency of the magnetic field is improved, and the magneto-rheological damper can generate large damping force and a large dynamic adjusting range under the limited size. Meanwhile, the damper is provided with the two coils, and the damping force requirements of the vehicle in different working states can be met.

Description

Technical Field

[0001] This invention relates to a magnetorheological damper, and more particularly to a magnetorheological damper with a curved magnetic circuit. Background Technology

[0002] Shock absorption has a significant impact on passenger cars, making its performance an important characteristic for evaluating driving experience. Passenger car shock absorbers are generally classified into three types: passive, semi-active, and active. Among these, semi-active magnetorheological dampers are often the first choice for passenger cars due to their advantages such as low cost, fast response, and simple structure.

[0003] Traditional magnetorheological dampers typically consist of a coil wound in a groove within a piston, with a straight damping channel above it. During operation, the magnetorheological fluid flows within the damping channel, while the coil generates a magnetic field perpendicular to the fluid's flow direction. This magnetic field then produces a controllable damping force. Before the magnetic circuit reaches saturation, the damping force can be adjusted by changing the current. Increasing the inner diameter of the damper cylinder or decreasing the width of the damping channel often increases the maximum damping force. However, increasing the cylinder diameter also increases the damper's size and weight; decreasing the channel width leads to an increase in the damping force at zero field, significantly reducing the controllable range of the magnetorheological damper.

[0004] Therefore, it is necessary to improve the structure of traditional magnetorheological dampers and design a magnetorheological damper with a compact structure, large output controllable damping force, wide damping force adjustment range, and suitable for various daily driving conditions of family cars. Summary of the Invention

[0005] To address the problems mentioned in the background art and in consideration of the practical requirements of magnetorheological dampers, this invention proposes a magnetorheological damper with a curved magnetic circuit, which has advantages such as small size and a large controllable range of damping force.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a magnetorheological damper for a curved magnetic circuit, comprising: a connecting lug, a piston rod 1, an end cap 1, a cylinder 1, a wire hole, a piston rod 2, an end cap 2, a cylinder 2, a piston end cap 1, a magnetic ring 1, a magnetic isolation ring 1, a winding frame 1, a coil 1, a magnetic ring 2, a magnetic ring 3, a magnetic ring 4, a magnetic isolation ring 3, a magnetic ring 5, a magnetic isolation ring 4, a magnetic ring 6, a winding frame 2, a coil 2, a magnetic ring 7, a magnetic ring 8, a magnetic isolation ring 5, a magnetic ring 9, and a piston end cap 2; the connecting lug and the piston rod 1 are fixedly connected by screws; the end cap 1, the end cap 2, and the cylinder 1 are fixedly connected by screws, and their clearances are matched. The piston rods 1 and 2 are fitted with end caps 1 and 2 respectively, and sealed with sealing rings; end caps 1 and 2 are fixedly connected by screws; piston rods 1 and 2 are respectively clearance-fitted with end caps 1 and 2, and sealed with sealing rings; piston rods 1 and 2 are connected together by threads for easy assembly; coils 1 and 2 are introduced through wire holes and wound on winding frames 1 and 2; piston end caps 1 and 2 are respectively fixedly connected to piston rods with screws; magnetic rings 1, 3, 5, 4, 7, and 9 are respectively transition-fitted with piston rods; winding frames 1 and 2 are respectively transition-fitted with cylinder body 1.

[0007] The magnetorheological damper with a curved magnetic circuit is described above, in which all magnetic rings are made of low-carbon steel magnetic material, the coil is made of copper wire, and the piston rod, winding frame and other magnetic shielding materials are made of 304 stainless steel.

[0008] Due to the adoption of the above technical solutions, the present invention has the following advantages: (1) The magnetorheological damper of the curved magnetic circuit, because of the alternating arrangement of the magnetic conducting ring and the magnetic insulating ring, the magnetic induction lines are bent, which can generate a magnetic field perpendicular to the damping channel of the magnetorheological damper along almost the entire length of the damping channel, greatly improving the utilization efficiency of the magnetic field, and can greatly improve the maximum output damping force of the magnetorheological damper without increasing the volume and weight of the magnetorheological damper. (2) The magnetorheological damper of the curved magnetic circuit is equipped with two coils that can be energized or de-energized according to different driving conditions of the car: when the car is going around a bend, the damping force required by the magnetorheological damper is small, so only one coil can be energized. When the car is driving on a bumpy road, the magnetorheological damper needs a larger damping force to reduce vibration. At this time, both coils are energized to obtain a larger damping force. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of a magnetorheological damper with a curved magnetic circuit according to the present invention.

[0010] Figure 2 yes Figure 1 Enlarged view of the piston section.

[0011] Figure 3 yes Figure 2 Front view of piston end cap 1 (9).

[0012] Figure 4 This invention relates to a curved magnetic circuit of a magnetorheological damper with a curved magnetic circuit.

[0013] Reference numerals: 1-Connecting lug, 2-Piston rod 1, 3-End cap 1, 4-Cylinder body 1, 5-Wire hole, 6-Piston rod 2, 7-End cap 2, 8-Cylinder body 2, 9-Piston end cap 1, 10-Magnetic ring 1, 11-Magnetic isolation ring 1, 12-Winding frame 1, 13-Coil 1, 14-Magnetic ring 2, 15-Magnetic ring 3, 16-Magnetic ring 4, 17-Magnetic isolation ring 3, 18-Magnetic ring 5, 19-Magnetic isolation ring 4, 20-Magnetic ring 6, 21-Winding frame 2, 22-Coil 2, 23-Magnetic ring 7, 24-Magnetic ring 8, 25-Magnetic isolation ring 5, 26-Magnetic ring 9, 27-Piston end cap 2. Detailed Implementation

[0014] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 The diagram shown is a structural schematic of a magnetorheological damper with a curved magnetic circuit according to the present invention. It mainly includes a connecting lug, a piston rod 1, an end cap 1, a cylinder 1, a wire hole, a piston rod 2, an end cap 2, and a cylinder 2.

[0016] Figure 2 yes Figure 1 An enlarged view of the piston section, including piston end cap 1, magnetic ring 1, magnetic isolation ring 1, winding frame 1, coil 1, magnetic ring 2, magnetic ring 3, magnetic ring 4, magnetic isolation ring 3, magnetic ring 5, magnetic isolation ring 4, magnetic ring 6, winding frame 2, coil 2, magnetic ring 7, magnetic ring 8, magnetic isolation ring 5, magnetic ring 9, and piston end cap 2.

[0017] Figure 3 yes Figure 2 The front view of the piston end cap shows the coil wound on the winding frame, with its lead passing through the square slot of the piston end cap and then through the wire hole of the piston rod to the outside of the magnetorheological damper: a curved annular damping channel is formed between the magnetic ring and the magnetic isolation ring.

[0018] Figure 4 This is a curved magnetic circuit diagram of a magnetorheological damper with a curved magnetic circuit according to the present invention. When a certain current is passed through the coil, a magnetic field perpendicular to the damping channel is generated due to the electromagnetic induction effect. When the magnetorheological fluid vibrates up and down with the piston, it flows through the damping channel and generates a damping force.

[0019] All the aforementioned magnetic rings are made of low-carbon steel magnetic material, the coils are made of copper wire, and the piston rod, winding frame, and other magnetic shielding materials are all made of 304 stainless steel.

[0020] The working principle of this invention is as follows: Magnetorheological fluid is injected into the cylinder through the injection hole on the end cap and sealed. When a passenger vehicle vibrates during driving, the vibration is transmitted to the magnetorheological damper on the suspension. The sensor outputs a corresponding current to the coil based on the magnitude of the vibration, generating a magnetic field circuit. Under the combined action of the magnetic isolation ring and the magnetic conduction ring, the magnetic circuit is forced to pass through the damping channel multiple times. The direction of the magnetic field is perpendicular to the flow direction of the magnetorheological fluid. At this time, the viscosity of the magnetorheological fluid in the damping channel increases under the influence of the magnetic field, rapidly changing from a Newtonian fluid state to a semi-solid state. The magnetorheological damper generates a corresponding damping force, thus producing a corresponding shock absorption effect for the car. Before the magnetic circuit reaches saturation, when the passenger vehicle is cornering, a smaller damping force is needed to counteract the centripetal force, at which point only one coil is energized. When the passenger vehicle is driving on bumpy roads, a larger damping force is needed to counteract the vibration, at which point both coils are energized, thus generating a larger controllable range of damping force, ensuring the driving comfort of the vehicle on complex road sections.

Claims

1. A magnetorheological damper with a curved magnetic circuit is characterized in that, Includes connecting lug (1), piston rod 1 (2), end cap 1 (3), cylinder 1 (4), wire hole (5), piston rod 2 (6), end cap 2 (7), cylinder 2 (8), piston end cap 1 (9), magnetic ring 1 (10), magnetic isolation ring 1 (11), winding frame 1 (12), coil 1 (13), magnetic ring 2 (14), magnetic ring 3 (15), magnetic ring 4 (16), magnetic isolation ring 3 (17), magnetic ring 5 (18), magnetic isolation ring 4 (19), magnetic ring 6 (20), winding frame 2 (21), coil 2 (22), magnetic ring 7 (23), magnetic ring 8 (24), magnetic isolation ring 5 (25), magnetic ring 9 (26), piston end cap 2 (27).

2. The magnetorheological damper for a curved magnetic circuit according to claim 1 is characterized in that, Also includes: The connecting lug (1) and piston rod 1 (2) are fixedly connected by screws; end cap 1 (3), end cap 2 (7) and cylinder 1 (4) are fixedly connected by screws, they are clearance fit and sealed by sealing rings; end cap 2 (7) and cylinder 2 (8) are fixedly connected by screws; piston rod 1 (2) and piston rod 2 (6) are clearance fit with end cap 1 (3) and end cap 2 (7) respectively, and sealed by sealing rings; piston rod 1 (2) and piston rod 2 (6) are connected together by threads for easy assembly; coil 1 (13) and coil 2 (22) are connected by wires. Hole (5) is introduced and wound on winding frame 1 (12) and winding frame 2 (21); piston end cap 1 (9) and piston end cap 2 (27) are fixedly connected to piston rod by screws; magnetic ring 1 (10), magnetic isolation ring 1 (11), magnetic ring 3 (15), magnetic isolation ring 3 (17), magnetic ring 5 (18), magnetic isolation ring 4 (19), magnetic ring 7 (23), magnetic isolation ring 5 (25), and magnetic ring 9 (26) are respectively transitionally fitted with piston rod; winding frame 1 (12) and winding frame 2 (21) are respectively transitionally fitted with cylinder 1 (4).

3. A magnetorheological damper for a curved magnetic circuit according to claim 1, characterized in that... All magnetic rings are made of low-carbon steel magnetic material, the coils are made of copper wire, and the piston rod, winding frame and other magnetic shielding materials are made of 304 stainless steel.

4. A magnetorheological damper for a curved magnetic circuit according to claim 1, characterized in that... The cylinder has two coils that can be energized or de-energized depending on the different driving conditions of the car: when the car is turning, the magnetorheological damper requires less damping force, so only one coil can be energized. When the car is driving on a bumpy road, the magnetorheological damper requires a larger damping force to reduce vibration, so both coils are energized to obtain a greater damping force.

Images