How to choose the clearance of the spur gear slew drive?

The clearance of a spur gear slew drive refers to the clearance of a slewing ring installed inside a spur gear drive, so how to choose the clearance of the spur gear slew drive? Before talking about this issue, we need to understand the definition of the clearance.

Bearing clearance is the backlash between the rolling elements of the bearing and the inner and outer ring raceway of the bearing. Specifically, the finished bearing is not installed and used, fix the outer ring or inner ring of the bearing, then move the unfixed ring in the axial or radial direction. The amount of movement of the unfixed ring is the clearance value of the bearing, which can be measured with a dial indicator and a magnetic gauge stand. According to the different direction of movement, the clearance is divided into axial clearance and radial clearance. The axial movement of the ring is axial clearance, the radial movement of the ring is radial clearance. The clearance when the bearing is running is called the working clearance. The working clearance has an impact on the bearing service life, bearing temperature rise, equipment vibration and noise.

The clearance of the spur gear slew drive is generally divided into large clearance, small clearance and negative clearance, choose different clearances according to different working conditions.

The large clearance spur gear slew drive is generally used in the working conditions with low accuracy requirements, slow speed, no tilting moment or very small tilting moment. For example, many automation equipment only require the spur gear drive to provide support and rotation functions, speed is very low, no precision is required and no partial load, this kind of large clearance spur gear slew drive is very suitable for use. Large clearance also has a great advantage. If the customer’s installation foundation is difficult to process and smooth, after the spur gear drive with small clearance is installed on the foundation, the rotation resistance may be large or it may not rotate at all. The spur gear slew drive with large clearance will not have this phenomenon, because the large clearance can resist the deformation of the spur gear drive due to the uneven foundation after installation, the rotation is still flexible after installation.

The small clearance spur gear slew drive is generally used in working conditions that require high accuracy, fast speed and tilting moment. If the clearance is too large, it will affect the accuracy of the slewing ring during rotation, which is not conducive to the stable operation of the equipment. At high speeds, large clearances will cause slewing drive vibration and noise, especially when using high speed vertical installations, small clearances must be used. Excessive clearance under working conditions with tilting moment will cause unstable rotation and affect the normal use of the equipment. Therefore, the precision requirements are high, the speed is fast, the small clearance spur gear slew drive is suitable for the working conditions with tilting moment.

Negative clearance spur gear drive are generally used in occasions with particularly high accuracy requirements. Under conditions with particularly high accuracy requirements, the clearance will not only affect the slewing accuracy, make the equipment unable to run smoothly and will affect the transmission accuracy of the slewing drive. Under high precision and large output torque conditions, the clearance will directly affect the gear transmission accuracy, increase the tooth backlash, reduce the transmission accuracy. Negative clearance in high precision applications can also make the equipment maintain accuracy for a long time without loss, reduce the equipment maintenance frequency and extend the service life of the equipment. The negative clearance spur gear slew drive has very strict requirements on the installation foundation. The installation foundation must be flat enough, otherwise the slewing drive will not rotate smoothly, get stuck or even fail to rotate.

When selecting and designing spur gear slew drive, it’s necessary to understand the operating conditions, so that we can select and design the spur gear drive suitable for use. Therefore, please cooperate with the engineers of U-TRSM to do a working condition investigation, so that the engineers can fully understand the working conditions and through reasonable analysis and necessary calculations, select and design your spur gear slew drive.

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How to choose the clearance of the spur gear slew drive?

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The clearance of a spur gear slew drive refers to the clearance of a slewing ring installed inside a spur gear drive, so how to choose the clearance of the spur gear slew drive?

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U-TRSM

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U-TRSM

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