GB/T 304.1-2017 English PDF (GBT304.1-2017)

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GB/T 304.1-2017: Spherical plain bearings -- Classification
GB/T 304.1-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.10
J 11
GB/T 304.1-2017
Replacing GB/T 304.1-2002
Spherical plain bearings - Classification
ISSUED ON. NOVEMBER 1, 2017
IMPLEMENTED ON. MAY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
China National Standardization Administration.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Structure type classification of spherical plain bearings ... 5 
5 Structure types of spherical plain bearings ... 8 
Foreword
GB/T 304 “Spherical plain bearings” is divided into four parts.
-- GB/T 304.1 Spherical plain bearings - Classification;
-- GB/T 304.2 Spherical plain bearings- Identification code;
-- GB/T 304.3 Spherical plain bearings - Fits;
-- GB/T 304.9 Spherical plain bearings - General technical regulations.
This part is the first part of GB/T 304.
This part was drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 304.1-2002 "Spherical plain bearings - Classification".
Compared with GB/T304.1-2002, the main technical changes are as follows.
-- Refine the classification of rod-end spherical plain bearings (see 4.3);
-- Add the classification of combining form of friction auxiliary materials on
sliding surfaces (see 4.5);
-- Add the classification of units indicated by size and tolerance (see 4.6);
-- Integrate the description of commonly-used structure and structural
characteristics of part of maintenance-lubrication-type spherical plain
bearings; add commonly-used maintenance-lubrication-type bearing
structures, such as SIBJ•••-type, SABJ•••-type,
SGFW(SGFEW)•••ES-type, SFW(SFEW)•••ES-type, SIRN•••ES-type,
SIGW(SIGEW)•••ES-type, SIQ•••ES-type, SIA•••ES-type ; revise part of
structure diagram (see Table 1, Table 1 of 2002 version);
-- Delete the following bearing structure types, such as GE•••F2-type,
GE•••FSA-type, GE•••F1H-type, GEEW•••ET, GEEW•••ET-2RS-type (see
Table 2 of 2002 version);
-- Integrate the description of commonly-used structure and structural
characteristics of part of maintenance-free self-lubricating spherical plain
bearings; add commonly-used maintenance-free self-lubricating bearing
structures, such as GEM (GEEM)•••ET-2RS, GE•••HT-type,
SIBJ•••C-type, SABJ•••C-type; revise part of structure diagram (see Table
2, Table 2 of 2002 version);
Spherical plain bearings - Classification
1 Scope
This part of GB/T 304 specifies the classification method of spherical plain
bearings and the structure type of commonly-used spherical plain bearings.
This part applies to the classification management of spherical plain bearing
products.
2 Normative references
The following documents are essential for the application of this document. For
dated references, only the dated version applies to this document. For undated
references, the latest version (including all amendments) applies to this
document.
GB/T 3944 Spherical plain bearings - Vocabulary
3 Terms and definitions
The terms and definitions defined in GB/T 3944 apply to this document.
4 Structure type classification of spherical plain
bearings
4.1 According to the difference of load direction or nominal contact angle, the
spherical plain bearings can be divided into.
a) Radial bearing - It is the spherical plain bearing which is mainly used to
bear radial load. The nominal contact angle is 0°≤ τ ≤30°. According to
the different nominal contact angles, they can be divided into.
1) Radial contact spherical plain bearing - It is the spherical plain bearing
with nominal contact angle τ = 0°. It is suitable to bear radial load, at
the same time it can bear axial load in any direction;
2) Angular contact radial spherical plain bearing - It is the spherical plain
bearing with nominal contact angle 0°< τ ≤30°. It is suitable to bear the
combination of radial load and axial load acting simultaneously.
-- Internal thread rod-end spherical plain bearing. the rod-end shank is
internal thread straight rod;
-- External thread rod-end spherical plain bearing. the rod-end shank is
external thread straight rod;
-- Rod-end joints equipped with welded seat. the rod-end shank is
flange seat, square seat or cylindrical seat with positioning pin,
which is fixed to the end of the rod by welding;
-- Rod-end spherical plain bearing equipped with locking seat. the
internal thread of the rod-end shank is grooved and equipped with
locking device.
4.4 According to whether it needs re-lubrication and maintenance when it is
working, spherical plain bearings can be divided into.
a) Maintenance-lubrication-type spherical plain bearing;
b) Maintenance-free self-lubricating spherical plain bearing.
4.5 According to the combination mode of friction auxiliary materials on sliding
surface, spherical plain bearings can be divided into.
a) Steel/steel spherical plain bearing;
b) Steel/copper alloy spherical plain bearing;
c) Steel/PTFE compound spherical plain bearing;
d) Steel/PTFE fabric spherical plain bearing;
e) Steel/reinforced plastic spherical plain bearing;
f) Steel/zinc-based alloy spherical plain bearing.
4.6 According to the representation unit of dimension and tolerance unit,
spherical plain bearings can be divided into.
a) Metric system (meter) spherical plain bearing;
b) English system (inch) spherical plain bearing.
4.7 According to the direction of bearing load, nominal contact angle and
structure type, spherical plain bearings can be divided into.
a) Radial spherical plain bearing;
b) Angular contact spherical plain bearing;
sealed on both sides).
GE•••ESN-type
radial spherical plain
bearing
Radial load and a
certain axial load in
any direction (When
axial load is borne by
stopper ring, the
bearing capacity shall
take into account the
factors of stopper
ring.)
Single-slit outer ring; there is
one or two stopper grooves
on the outer ring; there are
lubrication grooves and
lubrication holes.
GE•••XS-type
radial spherical plain
bearing
GE•••XS-2RS-type
radial spherical plain
bearing
Radial load and a
certain axial load in
any direction
Double-slit outer ring; there
is one or two locking ring
grooves on the outer ring;
there are lubrication grooves
and lubrication holes;(-2RS
is sealed on both sides).
GE•••HS-type
radial spherical plain
bearing
GE•••HS-2RS-type
radial spherical plain
bearing
Two-half outer ring can be
locked tightly by screw;
there are lubrication grooves
and lubrication holes on
inner ring; after wear,
clearance can be adjusted;
(-2RS is sealed on both
sides).
GE•••DE1-type
radial spherical plain
bearing
The inner ring is hardened
bearing steel; the outer ring
is unhardened bearing steel,
which is extruded into shape
when it is assembled with
the inner ring; there are
lubrication grooves and
lubrication holes. For the
bearing whose inner
diameter is less than 25mm,
there is no lubrication
groove and lubrication hole.