ISO 11687-1:2020
(Main)Plain bearings — Pedestal plain bearings — Part 1: Pillow blocks
Plain bearings — Pedestal plain bearings — Part 1: Pillow blocks
This document specifies design characteristics for pillow blocks for size ranges 9 to 28 and 35 to 71, as well as design characteristics for shafts. It is applicable to pillow blocks used mainly in electrical and turbo engineering industries.
Paliers lisses — Paliers lisses à chaise sur le sol — Partie 1: Supports de paliers
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 11687-1
Second edition
2020-06
Plain bearings — Pedestal plain
bearings —
Part 1:
Pillow blocks
Paliers lisses — Paliers lisses à chaise sur le sol —
Partie 1: Supports de paliers
Reference number
ISO 11687-1:2020(E)
©
ISO 2020
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ISO 11687-1:2020(E)
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ii © ISO 2020 – All rights reserved
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ISO 11687-1:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Types of pillow block . 2
4.1 General . 2
4.2 Housing . 2
4.3 Heat dissipation . 2
4.4 Shape of bore for journal bearing and type of lubrication . 2
4.5 Thrust bearing . 2
4.6 Seal . 3
5 Dimensions . 3
6 Shaft design . 3
7 Materials . 3
8 Design . 3
8.1 General tolerances . 3
8.2 Surface roughness . 3
8.3 Housing . 4
8.4 General . 4
9 Designation . 4
Bibliography .14
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ISO 11687-1:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 3,
Dimensions, tolerances and construction details.
This second edition cancels and replaces the first edition (ISO 11687-1:1995), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Clause 2 has been updated;
— the former Clause 6 (now Clause 7) has been updated.
A list of all parts in the ISO 11687 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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INTERNATIONAL STANDARD ISO 11687-1:2020(E)
Plain bearings — Pedestal plain bearings —
Part 1:
Pillow blocks
1 Scope
This document specifies design characteristics for pillow blocks for size ranges 9 to 28 and 35 to 71, as
well as design characteristics for shafts.
It is applicable to pillow blocks used mainly in electrical and turbo engineering industries.
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 185, Grey cast iron — Classification
ISO 630-2, Structural steels — Part 2: Technical delivery conditions for structural steels for general
purposes
ISO 683-3, Heat-treatable steels, alloy steels and free-cutting steels — Part 3: Case-hardening steels
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation
ISO 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 2768-2, General tolerances — Part 2: Geometrical tolerances for features without individual tolerance
indications
ISO 4381, Plain bearings — Tin casting alloys for multilayer plain bearings
ISO 8062-3, Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for
moulded parts — Part 3: General dimensional and geometrical tolerances and machining allowances for
castings
ISO 12129-1, Plain bearings — Tolerances — Part 1: Fits
ISO 12129-2, Plain bearings — Tolerances — Part 2: Tolerances on form and position and surface roughness
for shafts and thrust collars
ISO 14737, Carbon and low alloy cast steels for general applications
ASTM B124/B124M, Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes
3 Terms and definitions
No terms and definitions are listed in this document.
© ISO 2020 – All rights reserved 1
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ISO 11687-1:2020(E)
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Types of pillow block
4.1 General
According to their design, pillow blocks can be classified as per 4.2 to 4.5, each characteristic being
designated by a letter symbol.
Figure 1 and Figure 2 show examples of pillow blocks. These represent pillow blocks which are ready to
be installed, in the size ranges 9 to 28 and 35 to 71, respectively.
The symbols above Figure 1 and Figure 2 explain only the type illustrated; the complete type required
shall be specified in the below-mentioned sequence when ordering.
For reasons of design (e.g. on account of limited space) and economy, it is only possible to construct the
size range 35 to 71 with thrust bearings (A) with the dimensions given in Table 4.
4.2 Housing
G Pillow block, without cooling fins
R Pillow block, with cooling fins
4.3 Heat dissipation
N Natural cooling
W Water cooling in oil sump
U Circulation pump and natural cooling
T Circulation pump and water cooling in oil sump
Z Recirculating oil lubrication with external cooling of oil
4.4 Shape of bore for journal bearing and type of lubrication
C Circular cylindrical bore without oil ring
L Circular cylindrical bore with split oil ring not fixed on a rotating shaft
Y Lobed bearing with two sliding surfaces without oil ring
V Lobed bearing with four sliding surfaces without oil ring
4.5 Thrust bearing
Q Without sliding surfaces [non-locating (free) bearing]
B Plain sliding surfaces with oil grooves (guide bearing)
K Wedge surfaces
(design and dimensions at the manufacturer's discretion)
A Tilting pads
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ISO 11687-1:2020(E)
4.6 Seal
The type and dimensions shall be subjected to agreement.
5 Dimensions
The dimensions of Table 1 and Table 2 (see Figure 1 and Figure 2) shall apply.
The pillow blocks are not expected to conform to the designs illustrated in Figure 1 and Figure 2;
conformance is only required with respect to the dimensions specified.
NOTE Unless otherwise specified, all dimensions are given in millimetres.
Details which are not specified shall be chosen as appropriate.
6 Shaft design
The dimensions of Table 3 and Table 4 (see Figure 3 and Figure 4) shall apply.
7 Materials
The materials shall mee
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