How to quickly calculate the gear module of the F77 gear reducer?

How to quickly calculate the gear module of the F77 gear reducer?

When choosing a reducer, people often ask you what is the gear module in this reducer?How to calculate it?Today I will recommend some simpler methods, I hope they will be useful to you!

As shown in Figure 1 for the pump body, it is required to accurately measure the distance between the 13H7 hole and the 9H7 hole of 128 mm.Because the two holes are perpendicular to each other, it is difficult to detect using general methods. Figure 2 shows the inspection tool we specially designed for this purpose.The measuring head 6 in the measuring tool has a thread M2.5 and a dial indicator 7, and the measuring head (Figure 3) is a straight line, which facilitates the measurement of the mandrel 9 to accurately reflect the size on the dial indicator 7 when the mandrel 9 is connected in an emergency.At the same time, it is required that the dial indicator frame 4, the positioning axis 1 and the measuring mandrel 2 are equidistant, and the measuring mandrel is graded according to 0.002mm.

The measurement method using this measuring tool is: select the measuring mandrel 9 that is suitable for the 9rmm hole in the pump body, then insert the sample 8 into the measuring mandrel 2 of the measuring tool, and close the measuring mandrel 9 to the positioning shaft 1 and the sample 8. The probe of the sub-meter is pressed and the pointer moves accordingly, see Figure 4.After the dial indicator is zeroed, take out the sample, insert the measuring mandrel into the 9mm hole in the pump body, put the pump body into the measuring mandrel, and rotate the pump body at the same time so that the measuring mandrel leans against the positioning shaft, and the reading of the dial indicator can be obtained. reading.

Now we will introduce a relatively simple method to measure the module of gears.

When surveying and mapping a large helical gear shaft, due to the excessive extension of the shaft and the lack of special measuring tools, the root circle diameter cannot be measured, and only the tooth diameter d is measured.m=112mm, number of teeth x=16.In order to calculate the gear module, I printed part of the tooth surface and measured the helix angle to be about β=15°. According to the helical gear calculation formula, we have

In the formula: d——diameter of indexing circle

ma——normal module of helical gear

Eliminate d from equation (1) and equation (2), then

Select the standard module m from the standard module table.=6, calculate the diameter of the graduated circle d=100mm from equation (2), and then accurately calculate the helix angle A=16°, 15'37' and other basic parameters.