Interference fit H7/u6 for gear and shaft

An interference fit is a type of joint where two parts are joined together by a force that creates pressure between them. In this case, a gear needs to be shrunk on a shaft of basic size 120 mm with an interference fit H7/u6 being selected. The H7/u6 fit is a standard fit which provides a tight fit between the gear and the shaft.

Minimum and Maximum Diameter of the Shaft and Interference

The minimum and maximum diameter of the shaft and interference can be calculated using the following formulas:

Minimum shaft diameter (dmin):

dmin = basic size – allowance

Where the allowance is the difference between the maximum interference and the minimum clearance. For H7/u6 fit, the maximum interference is 16 μm and the minimum clearance is 0 μm. Therefore, the allowance is 16 μm.

dmin = 120 mm – 16 μm

dmin = 119.984 mm

Maximum shaft diameter (dmax):

dmax = basic size + allowance

For H7/u6 fit, the allowance is the same as before, which is 16 μm.

dmax = 120 mm + 16 μm

dmax = 120.016 mm

Minimum interference (δmin):

δmin = maximum interference – tolerance

The tolerance for a H7/u6 fit is 0 μm.

δmin = 16 μm – 0 μm

δmin = 16 μm

Maximum interference (δmax):

δmax = minimum interference + tolerance

The tolerance is 0 μm.

δmax = 0 μm + 0 μm

δmax = 0 μm

Therefore, the minimum and maximum diameter of the shaft is 119.984 mm and 120.016 mm, respectively. The minimum and maximum interference is 16 μm and 0 μm, respectively.

Conclusion

In conclusion, the H7/u6 interference fit provides a tight fit between the gear and the shaft. The minimum and maximum diameter of the shaft and interference can be calculated using the formulas mentioned above. These values are important to ensure that the gear and the shaft are properly fitted together.