▎ 摘　　要

NOVELTY - The housing has both the porous layer and the composite layer that are hollow cylinders with openings at both ends. The porous layer is set outside the composite layer, and the two are interference fit. A first element layer (101) is formed by closed-cell negative Poisson's ratio element cells arrayed in a face-centered cubic manner along the central axis. The porosities of the first to fourth element layers (104) are arranged in a negative gradient, gradually decreasing from the inside to the outside, and the adjacent element layers are arrayed in a face-centered cubic manner. The open-pore negative Poisson's ratio element cell and the closed-pore negative Poisson's ratio element cell are made of metal. The composite layer is formed by using a closed-cell foam metal plate (201) as the cathode of electrophoresis, and depositing a graphene solution on the surface through electrophoresis. USE - Driving motor housing based on negative Poisson ratio gradient hierarchical porous material. ADVANTAGE - The excellent performance of vibration reduction and noise reduction and anti-collision are ensured by the multi-layer material of negative Poisson ratio structure. The sound absorption performance is effectively increased, the motor vibration noise and electromagnetic noise are effectively reduced by gradient porous layer design. The vibration noise is reduced. The service life of the driving motor is prolonged, and the user experience is improved. The stable work of the motor is ensured. The performance of repeatedly absorbing electromagnetic wave for many times is excellent. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the driving motor housing based on negative Poisson ratio gradient hierarchical porous material. 101First element layer 102Second element layer 103Third element layer 104Fourth element layer 201Closed-cell foam metal plate 202Graphene film layer