Planetary gear reducers and worm gear reducers are the main products of Shanghai SGR Heavy Industry Machinery Co.,Ltd. Over the years, SGR, has gained the favor and recognition of a large number of industry customers with its independently designed and produced N series planetary gear reducers and C series worm gear reducers.
In fact, planetary gear reducers and worm gear reducers happen to represent the two most common transmission methods in the field of mechanical transmission, namely: gear transmission and worm transmission.
So, what exactly are gear transmission and worm transmission? What are the characteristics of these two transmission methods?
(1)Gear transmission
Gear transmission, as the name implies, refers to a mechanical transmission that uses gear pairs to transmit motion and power. Gear transmission can be divided into two parallel axes and two non-parallel axes according to the specific conditions of the axes; among them, the two parallel axes can be divided into spur gear transmission, helical gear transmission and herringbone gear transmission according to the direction of the gears; and which can also be divided into external gear transmission, internal gear transmission and rack and pinion transmission according to the meshing conditions.
Gears with two non-parallel axes can be divided into intersecting axis gear transmission (bevel gear transmission) and staggered axis gear transmission (staggered axis helical gear transmission, worm gear transmission).
Gear transmission has obvious advantages, including: high transmission efficiency (0.98-0.995), constant transmission ratio, compact structure, reliable operation, long life, and wide applicable peripheral speed and power range. However, gear transmission also has its specific disadvantages. Gear transmission requires high manufacturing and installation precision, is generally not suitable for transmission between two shafts with a large center distance a, has high maintenance costs, low precision, and high noise and vibration.
(2)Worm drive
The worm gear transmission mechanism is mainly composed of a worm wheel and a worm, which is used to transmit the motion between two staggered and perpendicular axes. According to the different shapes of the worm, the worm gear transmission can be divided into: cylindrical worm gear transmission, arc surface worm gear transmission and conical surface worm gear transmission, among which the cylindrical worm gear transmission is the most widely used.
Worm gear transmission has obvious advantages, including: (1) large single-stage transmission ratio, generally i=10-100, and in the indexing mechanism that transmits power, the maximum can reach more than 1500; (2) the same meshing is line contact, which can withstand greater power; (3) compact structure, smooth transmission, and no noise; (4) when the worm lead angle is smaller than the equivalent friction angle between the gear teeth, it has reverse stroke self-locking property, that is, the worm can only drive the worm wheel, and the worm wheel cannot drive the worm.
Worm gear transmission also has its specific disadvantages, including that the two axes are perpendicular and the linear speeds of the two wheel nodes are perpendicular, so the relative sliding speed is very large, which is prone to heat and wear; the efficiency of worm gear transmission is relatively low, generally 0.7-0.8, and the efficiency of self-locking worm and worm wheel is even lower, generally less than 0.5.
(3) How to choose a suitable reducer in industrial production and mechanical operations?
The above knowledge about gear transmission and worm transmission are all theoretical knowledge in the mechanical transmission industry. However, in actual work production and mechanical operations, buyers are still confused about how to choose a suitable reducer.
SGR provides you with the following practical suggestions:
a. First, determine the application scenario. For example, for low-speed and heavy-load applications, a cylindrical gear reducer should be selected; for high-speed and heavy-load applications, a planetary gear reducer is recommended; for low-speed and light-load applications, a worm gear reducer can be selected.
b. Determine the transmission ratio of the reducer. If the transmission ratio is too small, the output torque of the reducer will be insufficient and cannot meet the working conditions of the equipment; if the transmission ratio is too large, the output speed of the reducer will be too slow, affecting the production efficiency of the equipment. Therefore, when selecting the model, choose the appropriate transmission ratio according to the working conditions of the equipment.
c. Determine the output torque and output speed of the reducer; when selecting the model, choose the appropriate output torque and output speed according to the working conditions of the equipment. In addition, pay attention to the accuracy requirements of the output torque and output speed to ensure that the performance of the reducer meets the requirements of the equipment.
d. Determine the input speed of the reducer. If the input speed is too high, the input power and input torque of the reducer will be too large, increasing the operating cost of the equipment; if the input speed is too low, the input power and input torque of the reducer will be insufficient and unable to meet the working conditions of the equipment.
e. Determine the load capacity of the reducer. The load capacity determines the service life and reliability of the reducer. If the load capacity is too small, the service life of the reducer will be shortened; if the load capacity is too large, the cost of the reducer will increase. Therefore, when selecting the reducer, it is necessary to select the appropriate reducer model according to the working conditions and load capacity of the equipment.
Generally speaking, when choosing a reducer, you need to make comprehensive considerations based on the needs of the equipment. (Author: SGR, Angie Zhang)
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Email:export@sgr.com.cn
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