Friction damping device for washing machine

Abstract

The invention discloses a friction damping device for a washing machine, and relates to the technical field of friction damping. The friction damping device comprises an outer shell, a piston and a friction ring with a support frame, wherein a movable chamber and a damping chamber are arranged in the outer shell, and the other end of the piston is slidably connected with the outer shell and sequentially penetrates through a first buffer part, the friction ring and a second buffer part from outside to inside along the damping chamber. The friction damping device achieves different functions under the two modes that the washing machine operates a centrifugal machine and starts and stops the centrifugal machine; when the centrifugal machine operates normally, the friction ring does not apply resistance to the piston; but when the centrifugal machine vibrates at high frequency and encounters the first buffer part or the second buffer part when being started and stopped, the friction ring applies resistance to the piston, so that the friction ring only transmits a friction force to the piston in the axial direction as much as possible, and noise, vibration and overheating are reduced; and meanwhile, a first flexible element and a second flexible element are arranged to compensate tolerance of internal shapes of the piston and the outer shell due to the manufacturing process, and local vibration and noise caused when the piston slides in the outer shell are reduced.

Description

technical field [0001] The invention relates to the field of friction damping equipment, in particular to a friction damping device for a washing machine. Background technique [0002] The friction damping device of washing machine generally includes structures such as an outer shell, a piston, and a friction ring. The friction ring is fixed to the outer shell, and the piston moves at two extreme positions in the outer shell. Ideally, all forces in the radial direction between the piston and the friction ring The resultant force will be zero, and the friction ring will only transmit friction to the piston in the axial direction, but the reality is that the piston will oscillate and deflect during operation, resulting in a greater load on one side of the friction ring relative to the other , causing noise, vibration and overheating; at the same time, due to the tolerances in the manufacturing process of the internal shape of the piston and the outer shell, the cross-section i...

AI Technical Summary

Problems solved by technology

[0002] The friction damping device of washing machine generally includes structures such as an outer shell, a piston, and a friction ring. The friction ring is fixed to the outer shell, and the piston moves at two extreme positions in the outer shell. Ideally, all forces in the radial direction between the piston and the friction ring The resultant force will be zero and the friction ring will only transmit friction to the piston in the axial direction, but the reality is that the piston will oscillate and deflect during operation, resulting in a greater load on one side of the friction ring relative to the other , causing noise, vibration and overheating; at the same time, due to the tolerances in the manufacturing process of the internal shape of the piston and the outer shell, the cross-section is not a complete circle, so when the piston slides inside the outer shell, it may cause local vibration and noise, therefore, it is necessary to provide a washing machine with a frictional damping device to solve the above problems

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