Cylindrical gears are widely used in gear classification, and can be divided into straight cylindrical gears and helical cylindrical gears according to tooth type, and their related descriptions are as follows for reference and understanding.
Among the various gear types, the most commonly used is the straight cylindrical gear with teeth parallel to the shaft, as power transmission, its application is the most. However, the product has the following disadvantages.
The meshing is raw, there is a strong impact, vibration is more obvious, and meshing in and out due to errors lead to uneven speed.
However, replacing spur gears with helical gears does not necessarily improve gear strength, and in some cases (designs with low tooth surface strength and high tooth root strength), may even reduce gear strength. This requires you to make a comprehensive choice based on the actual application when selecting the product.
What are the basic parameters of straight cylindrical gears?
Number of teeth z, modulus m, indexing circle pressure angle a, tooth top height coefficient ha*, top clearance coefficient C*, etc.
What are the correct meshing conditions of straight cylindrical gears?
The meshing condition: the normal vector at their contact points is perpendicular to the relative speed of motion between them. Gears with the same modulus and pressure angle can mesh correctly.
Helical cylindrical gears were created to suppress disadvantages such as vibration or noise generated by meshing of straight cylindrical gears.
Helical cylindrical gear products have the advantages of no meshing blind zone, smooth speed, high load capacity, large overlap, low noise and impact and longer service life, but it has the disadvantage of generating axial force, and is generally used for high speed, heavy load and high power gear transmission.
What are the correct meshing conditions of helical cylindrical gears?
Correct meshing: equal modulus, equal pressure angle, equal helix angle, and opposite direction of rotation.
The gears used for transmission between two intersecting shafts are called bevel gears, which have straight teeth and helical teeth.
The straight cylindrical gears are called rack and pinion when they are expanded on a plane. By meshing the rack with the smaller straight cylindrical gears, rotary and linear motion can be realized.
Gear classification
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