Adjustable Hydrodynamic Radial Plain Bearing

Product catalog summary

General Overview
SPIETH Hydrodynamic Radial-Slide-Bearings are essential components in modern machinery, particularly valued for their high damping properties and concentric accuracy. They are widely used in mechanical engineering and machine tool construction due to their durability and shock resistance.

Hydrodynamic Lubrication
This process involves a lubricant-filled wedge-shaped gap in the bearing, creating a liquid thrust that lifts the spindle from the bearing surface. Mineral oils, especially spindle oils, are used, with external lubrication systems being the most efficient.

Sealing
Seals are crucial for preventing lubricant escape and protecting against dirt and humidity. Contact gaskets are suitable for low to medium speeds, while non-contact gaskets are preferred for higher speeds.

Adjustable SPIETH Radial-Slide-Bearing
These bearings allow for optimal bearing play and smooth operation, suitable for both high and low frequencies and directions. They are used in precision machinery like grinding machines and lathes, offering significant damping effects.

Layout and Function
The bearings consist of a steel hull with clamping screws and a bronze bearing bush, allowing for adjustable bearing play without scraping. The lubrication system ensures the spindle is lifted from the bearing surface.

Execution
The steel hull is made from special steel, and the bushing from high-grade bronze. The outer diameter is ground to specific tolerances, and clamping screws are tightened using a wrench.

Connecting Components
Housing: The housing bore must be machined to specific tolerances, with lubrication supply and return systems in place.
Spindle: The spindle surface must be cylindrical with specific roughness and hardness for optimal performance.

Mounting and Adjustment
Detailed instructions are provided for mounting and adjusting the bearing play, ensuring proper function and contact pattern assessment.

Table of Dimensions
A detailed table provides dimensions for various GLM series bearings, specifying pin and screw sizes.

Calculation of Bearing
The document outlines methods for calculating load capacity and other parameters using nomograms, providing a graphic method for determining unknown values.

Load Bearing Capacity and Pressure Calculation
Formulas are provided for calculating load-bearing capacity (F) and average high loading pressure (p), with dynamic viscosity (η) under working temperatures being a critical factor.

Heating of the Bearing
Two cases are considered for heat emission: at the bearing surface and to the coolant, with high temperatures determined using nomograms.

Viscosity of Standard Lubricants
Nomogram III provides the dynamic viscosity of standard lubricants based on working temperature.

Standard Values for Bearing Play
Nomogram IV lists standard values for bearing play, depending on bearing size and allowed high temperature.

Calculation Examples
Examples are provided for heat emission cases, detailing parameters such as diameter, load capacity, revolutions per minute, peripheral speed, average surface pressure, working viscosity, high temperature, friction loss, coolant quantity, working temperature, kinematical viscosity, and bearing play.

Legend
The document includes a legend explaining symbols used, such as F for load capacity, η for dynamic viscosity, u for peripheral speed, d for diameter, p for average surface pressure, P for friction loss, Q for coolant quantity, ΔT for high temperature difference, T for working temperature, ν for kinematical viscosity, and s for bearing play.

Assembly Example
An example of assembly is provided, describing the mounting of adjustable hydrodynamic sectionalised radial slide bearings GLM in the headstock bores, with axial guiding and sealing against oil loss using V-rings.

Catalog excerpts

Adjustable Hydrodynamic Radial Plain Bearing-1

Series GLM Works Standard SN 03.01 >

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Adjustable Hydrodynamic Radial Plain Bearing-6

Fig. 3: a iron hull b clamping screws c bushing d lubrication flute e lubrication hole f outer cut-in g lubrication inlet h lubrication outlet i cylindrical pin S bearing play S > 1 mounting play S > 2 mounting play r shaft-radius R slide-radius >

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Adjustable Hydrodynamic Radial Plain Bearing-11

b = supporting bearing width o

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Adjustable Hydrodynamic Radial Plain Bearing-12

∆⋅⋅⋅ρ= TQcP > oil oiloil ⋅≈∆ QPKT > oil ⋅⋅≈ minWIK03,0K >

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Adjustable Hydrodynamic Radial Plain Bearing-13

⋅ smPa 34 5,4 high temperature T > Nomogram I and II ∆ K 22 15 friction loss P W 22 590 coolant quantity Q l/min - 1,25 working temperature T C 42 35 > 2 10 > N'gr. III kinematical viscosity Џ mm /s 134 > at 20ŰC at 20C bearing play standard value S е m 18,5 17 > N'gr. IV

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Adjustable Hydrodynamic Radial Plain Bearing-16

kinematic viscosity dynamic viscosity > calculation of ν in η at an avera g e oil densit y of ζ =0 , 9 > . 10 > 3 k g /m > 3 temperature C >

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No part of this publication may be reproduced in any form without our prior permission. Although the speci-fications and information provided in this catalogue are compiled and checked for correctness with the greatest care, we are unable to accept liability for any errors or omissions which may have been overlooked. SPIETH-Maschinenelemente GmbH & Co KG Alleenstrasse 41 73730 Esslingen 20 >

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