Rear end cover of electric generator

Abstract

The invention provides a rear end cover of an electric generator. The rear end cover comprises a rear end cover body, wherein four fan-shaped through holes are formed in the rear end face of the rear end cover body, a rib plate is formed between every two of the four fan-shaped through holes, a boss extending backward is arranged in the central position of the rear end face, a stair-shaped through hole inside the boss forms a bearing chamber, the inner wall of the bearing chamber caves inward to form an axial groove, and the axial groove is formed in the middle of the rib plate close to the top portion of the bearing chamber. The lower portion of the side wall of the rear end cover body expands outward to form an arc-shaped protruding portion, a plurality of louver blades are evenly arranged on the protruding portion at intervals, the louver blades are arranged in a parallel and inclined mode, and an air inlet is formed between every two adjacent louver blades. The rear end cover prevents a bearing from easily going to the outer ring in the thermal state and has the advantages of being simple in structure, high in strength and novel and attractive in appearance.

Description

【Technical field】 [0001] The invention relates to a motor accessory, in particular to a generator rear end cover. 【Background technique】 [0002] In the past, the motor rear cover made of cast iron had defects such as bulky workpiece, rough surface, rust, and complicated manufacturing process. With the reform and opening up and the continuous advancement of science and technology, small motor end covers are basically replaced by aluminum alloy die-casting parts. [0003] Aluminum alloy die-casting parts have the advantages of light weight, beautiful appearance, flat and smooth surface, no rust, simple manufacturing process, and high production efficiency; however, there are also weak mechanical strengths, and when the machine works for a long time, with the increase of machine temperature , so that the thermal expansion of the bearing chamber occurs, leading to the outer ring of the bearing (the thermal expansion coefficient of the aluminum alloy material is larger than tha...

AI Technical Summary

Problems solved by technology

[0004] 1. The outer ring of the bearing is easy to run in a hot state;

[0005] 2. The strength of the rear end cover is weak;

[0006] 3. The protection level does not meet the requirements of the national standard GB / T4942.1-2006, the protection level (IP code) classification IP23 of the overall structure of the rotating electrical machine, in which "water spraying within the angle of 60° from the plumb line should have no harmful effects" requirements , the rear end cover of this structure, water will enter the motor from the air inlet, and even cause the motor to leak or burn out

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