Landfill coil type magneto-rheological shock absorber

Abstract

The utility model discloses a coil-embedded type magneto-rheological shock absorber, which belongs to the technical field of shock absorbers, and is characterized in that a magnet exciting coil is placed in a piston, so that the magnet exciting coil is prevented from being contacted with magneto-rheological fluid, the damage of the coil can be greatly reduced, namely, the corrosion is reduced, the abrasion is prevented, and the short circuit is prevented. The reliability, the performance and the safety of the shock absorber can be effectively improved, and meanwhile the structure and the maintenance work are simplified; and the structure is compact, the size of the piston is smaller, and the weight is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of vibration damping technology, specifically relating to a buried coil type magnetorheological vibration damper. Background Technology

[0002] Dampers are an important component of automotive shock absorbers. Common types of dampers include magnetorheological dampers and CDC hydraulic dampers. Compared to CDC hydraulic dampers, magnetorheological dampers have advantages such as faster response speed, better control effect, and stronger adaptability.

[0003] Currently, the working principle of magnetorheological dampers is based on the magnetorheological effect, that is, the change in the rheological properties of magnetorheological fluid under the action of an external magnetic field. Without a magnetic field, it behaves as a Newtonian fluid; under a strong magnetic field, it behaves as a viscoplastic material with a certain shear yield stress. This change allows the magnetorheological damper to quickly adjust the damping force to adapt to different driving conditions and road surfaces. When the excitation coil is typically wound around the piston, it comes into direct contact with the magnetorheological fluid. Although the magnetorheological fluid is mainly a liquid, it contains magnetic particles that have a certain degree of conductivity. If the excitation coil comes into direct contact with the magnetorheological fluid, current may leak through the fluid, causing an electrical short circuit. Furthermore, the chemical components in the magnetorheological fluid may corrode the coil's insulation material and wires, leading to a decrease in the coil's insulation performance or even damage. The coil material may also react chemically with the magnetorheological fluid, causing changes in the fluid's composition and thus affecting its magnetorheological properties. Summary of the Invention

[0004] This invention provides a magnetorheological vibration damper with an embedded coil, in which the excitation coil is embedded inside the piston and does not come into contact with the magnetorheological fluid, thereby eliminating the corrosion of the excitation coil wires by the magnetorheological fluid and improving the protection of the excitation coil.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A magnetorheological vibration damper with a buried coil includes: a piston component, a guide rod, a magnetically conductive housing, and a magnetorheological fluid; the guide rod passes through the piston component and can drive the piston component to move back and forth within the magnetically conductive housing; the cavity formed by the magnetically conductive housing, the piston component, and the guide rod is filled with magnetorheological fluid; an excitation coil is provided inside the piston component.

[0007] The guide rod includes a left guide rod and a right guide rod. The left side of the piston component is connected to a left guide rod with a screw hole on the end face, and the right side of the piston component is connected to a right guide rod with a stud on the end face. The stud of the right guide rod passes through the through hole in the middle of the piston component and is threadedly connected to the screw hole on the end face of the left guide rod, thereby connecting the left guide rod, the piston component and the right guide rod into a whole.

[0008] The magnetically conductive housing is located outside the piston component and is fixedly connected to the protective housing to form a shock absorber housing. The shock absorber housing is movably connected to the right guide rod through a round hole on the end face of the magnetically conductive housing, and is movably connected to the left guide rod through a round hole on the end face of the protective housing.

[0009] The free end of the protective housing and the free end of the right guide rod are respectively fixedly connected to the lifting ring;

[0010] The distance between the outer diameter of the piston component and the inner diameter of the magnetic housing is 0.5 mm. The piston component can move left and right inside the magnetic housing. The cavity formed by the magnetic housing, the left guide rod, the right guide rod and the piston component is filled with magnetorheological fluid.

[0011] Beneficial effects: This utility model provides a buried coil type magnetorheological vibration damper, which has the following advantages compared with the prior art:

[0012] 1. Compared with the traditional structure of winding the coil on the surface of the piston cylinder, this utility model embeds the excitation coil inside the piston, increases the outer magnetic working area, makes the structure compact, the piston volume smaller, and the weight greatly reduced.

[0013] 2. By embedding the coil inside the piston component and placing a magnetic shielding ring, this utility model can achieve better guidance of the electromagnetic field, reduce magnetic leakage, and increase the maximum output damping force and control range of the shock absorber.

[0014] 3. By embedding the coil inside the piston component, this utility model avoids contact between the excitation coil and the magnetorheological fluid, which can greatly reduce coil damage, i.e., reduce corrosion, prevent wear, and prevent short circuits, effectively protect the excitation coil, and simplify the structure and maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the magnetorheological vibration damper in this embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the left half piston structure in an embodiment of this utility model;

[0017] Figure 3 This is a schematic diagram of the right half piston structure in an embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the left guide rod structure in an embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of the right guide rod structure in an embodiment of this utility model;

[0020] Figure 6 This is a schematic diagram of the magnetic shielding ring structure in an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the magnetic circuit structure of the piston component of the magnetorheological damper in an embodiment of this utility model;

[0022] In the diagram, 1—Lifting ring one, 2—Protective housing, 3—Left guide rod, 4—Magnetic housing, 5—Left half piston, 6—Excitation coil, 7—Magnetic isolation ring, 8—Right half piston, 9—Right guide rod, 10—Magnetorheological fluid, 11—Lifting ring two, 501—Left half piston through hole, 801—Right half piston wire hole, 802—Right half piston through hole, 301—Left guide rod screw hole, 901—Right guide rod stud, 902—Right guide rod wire hole. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1 As shown, a landfill coil type magnetorheological vibration damper includes: a left half piston 5, a right half piston 8, a magnetic isolation ring 7, an excitation coil 6, a left guide rod 3, a right guide rod 9, a magnetically conductive housing 4, a protective housing 2, a lifting ring 1, a lifting ring 2 11, and a magnetorheological fluid 10.

[0025] like Figures 2-6 As shown, the magnetic isolation ring 7 is located between the left half piston 5 and the right half piston 8, and the left half piston 5, the right half piston 8, and the magnetic isolation ring 7 form a piston assembly containing a coil cavity. The coil cavity is filled with an excitation coil 6, forming a coil-embedded piston assembly. The left side of the piston assembly is connected to a left guide rod 3 with a threaded hole on its end face, and the right side of the piston assembly is connected to a right guide rod 9 with a stud on its end face. The right guide rod stud 901 passes through the through hole in the middle of the piston assembly, namely the left half piston through hole 501 and the right half piston wire hole 801, and is threaded to the left guide rod threaded hole 301 on the end face of the left guide rod 3, connecting the left guide rod 3, the piston assembly, and the right guide rod 9 into a whole. The right guide rod 9 is provided with a right guide rod wire hole 902 for connecting the wire of the excitation coil 6 through the hole.

[0026] The magnetic housing 4 is located outside the piston component and is fixedly connected to the protective housing 2 to form a damper housing. The damper housing is movably connected to the right guide rod 9 through the round hole on the end face of the magnetic housing 4. The damper housing is movably connected to the left guide rod 3 through the round hole on the end face of the protective housing 2. The gap between the outer diameter of the piston component and the inner diameter of the magnetic housing 4 is 0.5 mm. The piston component can move left and right inside the magnetic housing 4. The cavity formed by the magnetic housing 4, the left guide rod 3, the right guide rod 9 and the piston component is filled with magnetorheological fluid 10.

[0027] All of the above holes need to be sealed;

[0028] The lifting ring 1 is fixedly connected to the free end of the protective shell 2, and the lifting ring 21 is connected to the free end of the right guide rod 9.

[0029] When the shock absorber is working, the first ring 1 is connected to the car chassis, and the second ring 11 is connected to the car body. When the car vibrates due to uneven roadside, relative vibration occurs between the car body and the chassis, which drives the piston component to move back and forth in the magnetic housing 4. The magnetorheological fluid 10 located in the cavities at both ends of the piston component will be squeezed and relaxed, and will move back and forth through the gap between the piston and the magnetic housing 4, generating damping force.

[0030] like Figure 7 As shown, when a large damping force is required during vehicle operation, the excitation coil 6 is energized, generating a magnetic field in the gap between the piston component and the magnetic housing 4. This causes the magnetorheological fluid in the gap to undergo a rheological effect, that is, the state of the magnetorheological fluid changes from liquid to solid, thus increasing the damping force. When a small damping force is required, the current in the excitation coil 6 is removed, the magnetic field in the gap between the piston component and the magnetic housing 4 dissipates, and the magnetorheological fluid returns to a liquid state. Its resistance to passing through the gap is reduced, achieving a small damping force output. At the same time, by continuously adjusting the current value, the damping force of the shock absorber can be continuously controlled to adapt to different damping force requirements during vehicle operation.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A filled coil magneto-rheological damper, characterized in that, Include: Piston parts, guide rod, magnetic shell, magnetorheological fluid; The guide rod passes through the piston part, and can drive the piston part to move back and forth in the magnetic shell, the magnetic shell, the piston part, the guide rod are enclosed to fill the cavity with magnetorheological fluid; The piston part is provided with an excitation coil inside.

2. The filled coil MRF damper of claim 1, wherein, The piston part includes a left half piston, a right half piston, and a magnetic isolation ring, the magnetic isolation ring is between the left half piston and the right half piston, and the left half piston, the right half piston and the magnetic isolation ring enclose the piston as a whole with a coil cavity inside, and the coil cavity is filled with an excitation coil.

3. The filled coil MRF damper of claim 2, wherein, The left half piston and the right half piston are provided with through holes.

4. The filled coil MRF damper of claim 1 or 3, wherein, The guide rod includes a left guide rod and a right guide rod, and the left guide rod and the right guide rod are connected by threads and pass through the piston part.

5. The filled coil MRF damper of claim 4, wherein, The left guide rod is provided with a threaded hole, the right guide rod is provided with a threaded hole, and the threaded hole of the right guide rod passes through the through hole of the piston part and is threadedly connected with the threaded hole of the left guide rod.

6. The filled coil MRF damper of claim 4, wherein, The shock absorber includes a protective shell, the magnetic shell is located outside the piston part, and is fixedly connected with the protective shell to form a shock absorber shell, and the shock absorber shell is movably connected with the right guide rod through the circular hole of the end face of the magnetic shell, and is movably connected with the left guide rod through the circular hole of the end face of the protective shell.

7. The filled coil MRF damper of claim 1, wherein, The interval between the outer diameter of the piston part and the inner diameter of the magnetic shell is 0.5mm.

8. The filled coil MRF damper of claim 6, wherein, The free end of the protective shell and the free end of the right guide rod are fixedly connected with the lifting ring respectively.

9. The filled coil MRF damper of claim 8, wherein, The lifting ring of the free end of the protective shell is connected with the automobile chassis.

10. The filled coil MRF damper of claim 8, wherein, The lifting ring of the free end of the right guide rod is connected with the automobile body. The lifting ring of the free end of the right guide rod is connected with the automobile body.

Images