Reducer type knowledge is introduced and compared

by:J&T     2020-06-30
Reducer is generally used in low speed high torque transmission device, the power of motors, internal combustion engine, or other high speed running, less number of teeth on the input shaft of the reducer on the gear engagement output shaft of the big gear reduction to achieve the purpose of, the size of the ratio of the number of teeth on the gears, transmission ratio. Reducer is a relatively sophisticated machinery, the use of its purpose is to reduce rotation speed, increase torque. There are many types of reducer, different types, different kinds have different USES. According to the transmission type can be divided into gear reducer, worm gear reducer and planetary gear reducer; According to the different can be divided into single-stage and multi-stage transmission series reducer; According to the gear shape can be divided into cylindrical gear reducer, cone gear reducer and the cone - Cylindrical gear reducer; According to the transmission can be divided into the expansion of decorate a form, shunt type and coaxial reducer. In order to facilitate reasonable choice reducer, so will the types, characteristics and application of several common reducer list, for type selection reference. 1, single-stage spiral bevel gear reducer single-stage spiral bevel gear reducer and reduction ratio 2 ~ 4 shall apply. Shoulds not be too great velocity ratio, in order to reduce the size of the bevel gear, for processing. Only for the transmission of two vertical axes intersect. 2, single stage spur gear reducer single stage spur gear reducer is suitable for the reduction ratio 3 ~ 5. Tooth to spur, bevel or herringbone gear, box usually adopts the cast iron casting, also can use the steel plate welded together. Commonly used rolling bearings, bearing only with overloading or special high-speed sliding bearings. 3, two-stage cylindrical gear reducer double-stage cylindrical gear reducer has exploded, shunt type, coaxial type three, reduction ratio of 8 ~ 40 shall apply. Level expansion: the long tail, bevel or low level can be straight helical. Because of the asymmetric gear relative bearing arrangement, large shaft rigidity requirements, input, output and torque from gear, to reduce the load caused by bending deformation of shaft along the uneven distribution of tooth width. Simple structure, wide application. Shunt shunt type: generally USES high-speed level. Due to the gear relative bearing arrangement is symmetrical, so gear and bearing stress is relatively uniform. In order to make the shaft on the total axial force is small, two pairs of gear helix direction should be the opposite. Structure is complex, often used in high power, variable load. Coaxial: reducer of the axial size is larger, intermediate shaft is longer, poor rigidity. When two similar big gear oil immersion depth, high level gear bearing capacity can not give full play to. Used in the place of the input and output axis coaxial line. 4, conical, cylindrical gear reducer conical, cylindrical gear reducer is suitable for the reduction ratio is 8 ~ 15. Bevel gear should decorate level at high speed, in order to reduce the size of the bevel gear. Bevel gears can be straight or curve tooth. Cylindrical gear for helical gear, make its can and axial force offset part of the bevel gear. 5, planetary gear reducer, planetary reducer for structure reason, small single reduction of 3, generally no more than 10, common reduction ratio as: 3/4/5/6/8/10, reducer series is generally not more than three, but there are some big reduction ratio custom reducer with 4 reduction. Relative to other gear reducer, planetary reduction machine has high rigidity, high precision, Can be done in single stage) within 1 minute, , high transmission efficiency, Single stage at 97% 98%) , high torque, volume ratio, life-long free maintenance, etc. Because of these characteristics, most planetary reducer are installed on the stepper motor and servo motor, used to reduce speed and increase torque, match the moment of inertia. 6, worm reducer are cylindrical worm reducer, arc torus worm reducer, cone worm reducer and worm & ndash; Gear speed reducer, which is commonly used for cylindrical worm reducer. Worm reducer is suitable for the reduction ratio is 10 ~ 80. Compact structure, large transmission ratio, but the transmission efficiency is low, suitable for small power, the occasion of clearance work. When the worm V&le circumferential speed; 4 ~ 5 m/s, the worm is set type, good lubrication cooling conditions; When V≥ 4 ~ 5 m/s, when oil churning loss is bigger, general worm for the stove on.
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