ISO 12130-1:2021 Plain bearings — Hydrodynamic plain tilting pad thrust bearings under steady-state conditions —Part 1: Calculation of tilting pad thrust bearings

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Plain bearings — Hydrodynamic plain tilting pad thrust bearings under steady-state conditions —Part 1: Calculation of tilting pad thrust bearings由国际标准化组织于2021-04发布，适用于国际范围。

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INTERNATIONAL STANDARD ISO 12130-1:2021(E)

Plain bearings — Hydrodynamic plain tilting pad thrust bearings under steady-state conditions —

Part 1: Calculation of tilting pad thrust bearings

1 Scope

This document specifies a calculation method for oil-lubricated hydrodynamic plain bearings with complete separation of the thrust collar and tilting pad thrust bearing surfaces by a film of lubricant.

This document applies to plain thrust bearings with tilting-type sliding blocks (tilting pads), where a wedge-shaped lubrication clearance gap is automatically formed during operation. The ratio of width to length of one pad can be varied in the range B/L = 0,5 to 2.

This document is not applicable to heavily loaded tilting pad thrust bearings.

NOTE Equivalent calculation procedures exist that enable operating conditions to be estimated and checked against acceptable conditions. The use of them is equally admissible.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 12130-2, Plain bearings — Hydrodynamic plain tilting pad thrust bearings under steady-state conditions — Part 2: Functions for calculation of tilting pad thrust bearings

ISO 12130-3, Plain bearings — Hydrodynamic plain tilting pad thrust bearings under steady-state conditions — Part 3: Guide values for the calculation of tilting pad thrust bearings

3 Terms a nd definiti ons

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://w ww .iso. org/o bp

— IEC Electropedia: available at http:// www .electropedia .org/ 4 Symbols, terms and units

Symbols, terms and units are shown in Table 1 and Figure 1.

Table 1 — Symbols, terms and units

Symbol Term Unit

a distance between supporting point and inlet of the clearance gap in the m

F

direction of motion (circumferential direction)

ISO 12130-1:2021(E)

Table 1 (continued)

Symbol Term Unit

* relative distance between supporting point and inlet of the clearance gap in 1

a

F

the direction of motion (circumferential direction)

2

A heat-emitting surface of the bearing housing m

B width of one pad m

B axial housing width m

H

Cp specific heat capacity of the lubricant (p = constant) J/(kg⋅K)

C wedge depth m

wed

D mean sliding diameter m

D housing outside diameter m

H

D inside diameter over tilting pads m

i

D outside diameter over tilting pads m

o

f* characteristic value of friction 1

F bearing force (load) at nominal rotational frequency N

F* characteristic value of load carrying capacity 1

F bearing force (load) at standstill N

st

h local lubricant film thickness (clearance gap height) m

h minimum permissible lubricant film thickness during operation m

lim

h minimum permissible lubricant film thickness on transition into mixed m

lim,tr

lubrication

h minimum lubricant film thickness (minimum clearance gap height) m

min

2

k heat transfer coefficient related to the product B · L · Z W/(m ⋅K)

2

k external heat transfer coefficient (reference surface A) W/(m ⋅K)

A

L length of one pad in circumferential direction m

M mixing factor 1

-1

N rotational frequency (speed) of thrust collar s

p local lubricant film pressure Pa

p Pa

specific bearing load pF=⋅/()BL⋅Z

maximum permissible specific bearing load Pa

p

lim

P frictional power in the bearing or power generated heat flow rate W

f

P heat flow rate to the environment W

th,amb

heat flow rate arising from the friction power W

P

th,f

P heat flow rate in the lubricant W

th,L

3

Q lubricant flow rate m /s

Q* characteristic value of lubricant flow rate 1

3

Q m /s

relative lubricant flow rate QB=⋅hU⋅⋅Z

0

0 min

3

Q lubricant flow rate at the inlet of the clearance gap (circumferential direction) m /s

1

*

characteristic value of lubricant flow rate at the inlet of the clearance gap 1

Q

1

3

Q lubricant flow rate at the outlet of the clearance gap (circumferential direction) m /s

2

* **

1

Q characteristic value of lubricant flow rate QQ− at the outlet of the 2 13

clearance gap

3

Q lubricant flow rate at the sides (perpendicular to circumferential direction) m /s

3

*

characteristic value of lubricant flow rate at the sides 1

Q

3

Re Reynolds' number 1

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