The utility model relates to a low noise gear that easily maintains belongs to mechanical transmission technical field, mainly includes gear body, tooth, tooth's socket, shaft hole, installation cover, retainer plate, pit, the fine cotton piece of glass, mounting groove, the outer edge of gear body be provided with the tooth's socket, be provided with the mounting groove between the tooth's socket, install tooth in the mounting groove, the middle part of gear body is provided with the shaft hole, is provided with the retainer plate on the inner wall in shaft hole, is provided with the installation cover on the inner wall of retainer plate, is provided with the pit on the gear body, is provided with the fine cotton piece of glass in the pit, the utility model discloses set up tooth and installation cover into detachable construction, tooth and installation are overlapped and the wearing and tearing back is appeared, only need change to wearing parts, and the topic that is that traditional gear cost of maintenance is high, the maintenance is inconvenient has been solved to the whole gear that does not need to be changed, can absorbed vibration and the fine cotton piece of glass of noise through setting up on the gear body, it is big to have solved traditional gear work week ring edge border noise, problem that life is short.