ISO/TR 17606:2014

TECHNICAL ISO/TR
REPORT 17606
First edition
2014-06-15
Plain bearings — Lubrication
characteristics of crosshead pin
bearings for low-speed marine diesel
engines
Paliers lisses — Caractéristiques de lubrification des paliers de crosse
pour moteurs diesels marins à vitesse faible
Reference number
ISO/TR 17606:2014(E)
©
ISO 2014

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ISO/TR 17606:2014(E)

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ISO/TR 17606:2014(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Crosshead pin bearing and its symbols . 1
3 Oil supply method on bearing sliding surfaces . 3
4 Shape of a bearing . 3
4.1 Bearing inside diameter, bearing width, height, circumferential groove, and an
upper bearing . 3
4.2 Wall thickness of a bearing and shape of its bore . 4
4.3 Oil supply — Lubrication characteristics . 5
Bibliography . 8
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ISO/TR 17606:2014(E)

Foreword
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The committee responsible for this document is ISO/TC 123, Plain bearings, Subcommittee SC 7, Special
types of plain bearings.
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ISO/TR 17606:2014(E)

Introduction
For crosshead pin bearings, with which a shaft oscillates when a load is applied mainly in a downward
direction, it is difficult to generate an appropriate lubricating film; therefore, they are subject to
unfavourable lubricating conditions. For better lubrication of crosshead pin bearings, which have a
high rate of damage, two types of bearing structures are mainly used as oil supply methods for sliding
surfaces at present. The characteristics of those bearings are compared and the concept of design
approaches is standardized.
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TECHNICAL REPORT ISO/TR 17606:2014(E)
Plain bearings — Lubrication characteristics of crosshead
pin bearings for low-speed marine diesel engines
1 Scope
This Technical Report specifies lubrication characteristics of grooves and pockets on crosshead pin
bearings for low-speed marine diesel engines.
It is applicable to the design of axial oil groove and pocket types as an oil supply method.
2 Crosshead pin bearing and its symbols
The crosshead pin bearing and changes in specific load and angular velocity during one cycle are
schematically illustrated in Figures 1 and 2. Table 1 shows the symbols and their descriptions.
Figure 1 — Crosshead pin bearing
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ISO/TR 17606:2014(E)

Figure 2 — Changes in specific load and angular velocity during one cycle
Table 1 — Symbols and their descriptions
Symbol Description
e eccentricity
hmin minimum oil film thickness
l subtended taper length
L axial width
O center of bearing
b
O center of journal
j
p oil film pressure
P1 pad 1
P2 pad 2
P3 pad 3
specific load
P
r

r shaft radius
F bearing load
α circumferential pitch angle
β circumferential width angle
γ taper depth
φ oscillation angle
ϕ attitude angle
θ circumferential angular coordinate
θ2 – θ1 effective angular extent of bearing arc
ω angular velocity
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ISO/TR 17606:2014(E)

3 Oil supply method on bearing sliding surfaces
There are two oil supply methods. One is for bearings with a few (normally four) axial grooves. Oil is
supplied to the sliding surface at normal pressure through these oil grooves. The other is for bearings
with two oil pockets symmetrically located relative to the central part of each bearing. Oil is supplied to
the oil pockets at high pressure to provide a hydrostatic bearing mechanism (see Figure 3).
Figure 3 — Bearings with axial grooves and oil pockets
4 Shape of a bearing
4.1 Bearing inside diameter, bearing width, height, circumferential groove, and an up-
per bearing
The diameter of a crosshead pin is set by consideration of
...