Many types of reducer, drive types can be divided in accordance with the gear reducer, worm gear reducers and planetary gear unit and combine them with each other; in accordance with the transmission of the series can be divided into single-stage and multi-stage reducer; in accordance with the gear shape can be divided into cylindrical gear reducer, bevel gear reducer and a tapered cylindrical gear reducer; according to arrangement can be divided into transmission expansion, Split and coaxial reducer.

The basic structure Reducer

Reducer is mainly composed of transmission components (gears or worm), shafts, bearings, housing and the attachment of the composition. Its basic structure has three parts: 1) gear, shaft and bearing assembly; 2) housing; 3) reducer annex.

Gear, shaft and bearing assembly

Small gear integrally formed with the shaft, said gear shaft, the diameter of this structure for the gear associated with the shaft diameter is not the case, if the diameter of the shaft is d, the gear dedendum circle diameter df, then when df- d≤6 ~ 7mn, should adopt this structure. When df-d> 7mn 6 ~, the use of gear and shaft separated into two parts of the structure, such as a low speed shaft and the large gear. At this week to the fixed gear shaft parallel key connection, shaft parts use the shoulder, sleeve and axially fixed the bearing cap. Two axes are the deep groove ball bearings. This combination, used to bear radial load and axial load is not the case. When the axial load is large, you should use angular contact ball bearings, tapered roller bearings or a combination of structures deep groove ball bearings and thrust bearings. Bearing is the use of the gear rotates splashes dilute oil lubrication. Lubricating oil tank box seat, was spinning gear splashes splashing onto the inner wall of the lid and along the inner wall surface flows binning groove, the lead tank through the inflow bearings. When oiled gear circumferential speed υ≤2m / s shall be used grease lubricated bearings, to avoid possible splashes of light oil wash away the grease slinger can be separated. To prevent loss of lubricant and external dust from entering the tank, between the bearing cap and the shaft extension with sealing elements.

Case

Housing is a key component of the gear unit. It is the base transmission parts, should have sufficient strength and rigidity.

Usually gray cast iron housing, for heavy load or impact load reducer can be with steel casing. Monomer production reducer, in order to simplify the process, reduce costs, can be welded steel box.

Grey cast iron has good casting properties and damping properties. For easy installation and removal shafting member cabinet formed along the axis horizontal split. The lid and lower casing are bolted into one. Bearing bolts should be as close to the bearing hole, while bearing next to the boss, you should have sufficient supporting surface in order to place the bolts and tighten the bolts when needed to ensure the wrench space. To ensure that the housing has a sufficient rigidity in the vicinity of the bearing hole plus support ribs. To ensure that the gear unit arranged on the basis of stability and to minimize the machining area of ??the housing base plane, cabinet base generally do not use the full plane.