Flat Gear Rack

Type selection, installation and lubrication of Flat Gear Rack:

1. Type selection of Flat Gear Rack : modulus is the value indicating the tooth shape and size of the gear. Only when the modulus and pressure angle of the two gears are the same can bonding transmission be carried out.

M=d/z, where D is the diameter of the reference circle; Z is the number of teeth. The larger the modulus, the stronger the load capacity.

Common modulus: 0.5, 0.8, 1.0, 1.5, 2.0, 2.5, 3.0; According to the actual application, the load force * reference circle radius * safety factor shall be less than the allowable transfer force.

Incidentally, the diameter of the reference circle, that is, the diameter of the graduation circle, affects the moving speed. The specific calculation formula is:

w=2 Π n/60

v=wr

Where W is the angular velocity, n is the rotational speed, and the unit is r/min; R is the radius of the graduation circle.

In practical applications, we usually choose helical teeth. As for the comparison between straight teeth and helical teeth, helical teeth have the following differences:

a. The operation is stable and the noise is low. Because only a part of each tooth surface of the helical gear participates in the meshing process, or it is understood that each tooth gradually participates in the meshing and will not produce large vibration, the noise is low.

b. The load-bearing capacity of helical gears with the same modulus and width is higher than that of spur gears, because the effective tooth width of helical gears is larger in this case.

C. Because there are more meshing contact surfaces, the accuracy of helical teeth is generally better than that of straight teeth of the same grade.

d. Because the helical gear has left-hand and right-hand rotation, the direction must be determined when it is matched with the rack. Generally, the left-hand gear is matched with the right-hand rack.

e. Helix angle is a special feature of helical gears. Generally speaking, the helix angle of helical gears we usually refer to refers to the helix angle on the indexing cylindrical surface. The larger the helix angle is, the greater the coincidence degree is, which is more conducive to smooth movement and reduce noise. Everything has two sides. Although increasing the helix angle brings many advantages, the axial force generated during operation also increases. Therefore, the size of the helix angle should depend on the quality requirements and machining accuracy of the work. Generally, it is 8-25. If there are special requirements for noise, it can be taken as a larger value according to the situation.

We can make good quality flat gear rack.

 

 

 

 

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