Magnetorheological torsion damper and automotive seat with same

Abstract

The invention discloses a magnetorheological torsion damper and an automotive seat with the same. The magnetorheological torsion damper comprises a cylinder body and a rotary shaft, wherein a containing cavity is arranged in the cylinder body, the rotary shaft stretches out of the containing cavity and is in running fit and sealing with the cylinder body, and the longitudinal section of the containing cavity is round. The magnetorheological torsion damper further comprises an internal cavity frame, an arc-shaped piston and an least one group of electromagnetic coils, wherein the internal cavity frame, the arc-shaped piston and the electromagnetic coils are all arranged in the containing cavity, the internal cavity frame is in the shape of an arc which is concentric with the inner wall of the cylinder body, one end of the internal cavity frame extends outwards in the radial direction to form a connecting part fixedly connected to the cylinder body, one end of the arc-shaped piston is connected with the rotary shaft and can rotate along with the rotary shaft, the other end of the arc-shaped piston is arranged between the internal cavity frame and the inner wall of the cylinder body in the mode that the end can rotate in the circumferential direction along with the rotary shaft, a sub-cavity I and a sub-cavity II are formed by the arc-shaped piston, the internal cavity frame and the cylinder body, radial gaps which can be communicated with the sub-cavity I and the sub-cavity II are arranged between the two sides, in the radial direction, of the arc-shaped piston and the internal cavity frame and between the two sides, in the radial direction, of the arc-shaped piston and the inner wall of the cylinder body in the circumferential direction, and the electromagnetic coils are wound on the arc-shaped piston in the radial direction. The magnetorheological torsion damper is compact in structure, large toque which can be used for restraining vibration can be output under the condition that the vibration torsion angle is limited, and the magnetorheological torsion damper is suitable for the occasions, such as the automotive seat, a suspension and a clutch, with small torsion angles.

Description

technical field [0001] The invention relates to the field of magnetorheological damping, in particular to a magnetorheological torsional damper and an automobile seat thereof. Background technique [0002] Magnetorheological fluid is an important branch of the smart material family. Magnetorheological fluid behaves as a Newtonian fluid with good flow performance under the condition of zero field, and its apparent viscosity is very small; under the action of a strong magnetic field, its apparent viscosity can increase by two orders of magnitude in a short time of milliseconds Above, it presents a solid-like characteristic, and the change process is continuous and reversible. In the prior art, utilizing the characteristics of rapid response and easy control of the magneto-rheological effect, relatively complete electromechanical products such as dampers, brakes, clutches, hydraulic valves, and sealing devices suitable for active and semi-active control have been designed. It...

AI Technical Summary

Problems solved by technology

However, whether it is a single-plate rotary damper or a multi-plate structure, it can rotate 360°. In some occasions where the vibration amplitude is not too large, such as car seats, suspensions, and clutch torsional damping, etc. Rotation occasions with limited torsional angles , is not very applicable; that is, when the torsion angle generated by the vibration is not large, the damping force output by the above-mentioned damper, whether it is a single-piece or a multi-piece structure, is limited, and it cannot output a large torque to suppress the vibration

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