Bosch Rexroth IndraDyn S - MKE Project Planning Manual

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86/131 Bosch Rexroth AG | Electric Drivesand ControlsRexroth MKE Synchronous Motors | Project Planning ManualOperating Conditions and Application NotesWearRadial shaft sealing rings are rubbing seals. Hence, they are subject to wearand generate frictional heat.Wear of the rubbing seal can be reduced only if lubrication is adequate and thesealing point is clean. Here, the lubricant also acts as a coolant, supporting thedischarge of frictional heat from the sealing point.●Prevent the sealing point from becoming dry and dirty. Always ensure adequatecleanliness.Under unfavorable ambient conditions (e.g. grinding dust, metalshavings), maintenance could be necessary.ResistanceVertical installation positionsIM V3Note on constructionThe materials used for the radial shaft sealing rings are highly resistant to oilsand chemicals. The performance test for the particular operating conditions lies,however, within the machine manufacturer’s responsibility.The degree of protection on the flange side of motors with a shaft sealing ringis IP 65. Hence, tightness is ensured only in case of splashing fluids. Fluidlevels present on the A-side require a higher degree of protection. If the motoris installed in vertical position (shaft pointing up), the instructions in the section”Design and Installation Positions” in this chapter must, in addition, be observed.Rexroth recommends that any direct contact of the drive shaft and the radialshaft sealing ring with the processing medium (coolant, material corrosion)caused by the machine or system construction should be avoided.9.10 Bearings and Shaft Load9.10.1 General9.10.2 Radial Load, Axial LoadDuring operation, both radial and axial forces act upon the motor shaft and themotor bearings. The construction of the machine, the selected motor type andthe attachment of driving elements on the shaft side must be adapted to oneanother to ensure that the load limits specified are not exceeded.Fig.9-17:Example of a shaft load diagram
Project Planning Manual | Rexroth MKE Synchronous Motors Electric Drivesand Controls| Bosch Rexroth AG 87/131Operating Conditions and Application NotesMaximum permissible radial forceFradial_maxPermissible radial force FradialPermitted axial force FaxialMean speedThe shaft load diagrams of the individual motors are given in the followingchapters:● MKE037 chapter 4.2 "MKE037" on page 26● MKE047 chapter 4.3 "MKE047" on page 28● MKE098 chapter 4.4 "MKE098" on page 30● MKE118 chapter 4.5 "MKE118" on page 33The maximum permissible radial force F radial_max depends on the following factors:●●●Shaft break loadForce's point of application xShaft design (plain; with key)The maximum permissible radial force F radial depends on the following factors● Arithmetic mean speed (n mittel )●●Force's point of application xBearing lifetimeThe maximum permitted axial force F axial is specified in the Technical Data, inthe ”Shaft load” section.In the exact calculation of the mean speed according to the following example,the run-up and braking times are taken into account.n 1m ; n 2mn 1 ; n 2t H1 ; t H2t 1 ; t 2t B1 ; t B2t 11 ; t 22Fig.9-18:9.10.3 Attachment of Drive ElementsMean speed sectionprocessing speedrun-up timeprocessing timebraking timestandstill timeMean speedA complete processing cycle can consist of several sections with differentspeeds. In this case, the average is to be generated from all the sections.The run-up and braking times can be ignored in the calculation ifthe time in which the drive is operated at a constant speed is significantlygreater than the acceleration and braking time.Whenever attaching drive elements to the output shaft, such as●gearboxes
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Bosch Rexroth IndraDyn S - MKE Project Planning Manual

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