Experimental Studies on an Externally Pressurized Crosshead-Pin Bearing.

Wakuri, Yutaro; Kitahara, Tatsumi; Hamatake, Toshiro; Soejima, Mitsuhiro; Hirata, A.

doi:10.1299/kikaic.63.2832

Cited by 4 publications

(5 citation statements)

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“…The oil film exchange for the crosshead bearing is dependent upon the oscillation motion. Therefore, when the centre pad length is larger than the journal oscillation angle, the lubricating oil at the bearing centre cannot be readily displaced by fresh oil from the oil-grooves, thereby causing the oil film temperature to increase (4) . This reduces the load carrying capacity significantly.…”

Section: Influence Of Taper Geometry Modified Oilgroovesmentioning

confidence: 99%

“…Figure 2 shows a schematic diagram of the test appa- ratus. The test journal (1), with a diameter of 100 mm, was supported on each side by roller bearings (3), and oscillated within a small angle (2ψ = 55 deg) by an oscillation device (4). The test bearing (2) was subject to a cyclically fluctuating load applied vertically by an oil pressure ram (5).…”

Section: Introductionmentioning

confidence: 99%

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Influences of Taper Geometry Modified Oil-Grooves on Load Carrying Capacity of Crosshead Bearings

Kitahara

Otsubo

Nakahara

2006

JSME Int. J., Ser. C

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The crosshead bearing in large two-stroke diesel engines operates under severe lubrication conditions, because the bearing oscillates within a small angle at a low speed and is always subject to a high downward load. The recent trend towards more compact engines with increased output raises the bearing specific load, thereby causing the lubrication severity to increase significantly. Thus it is very important to improve the load carrying capacity of the crosshead bearing. In the present study, experiments using a dynamically loaded bearing seizure test apparatus were carried out to clarify the influences of the clearance ratio and the oil-groove geometry on the load carrying capacity. The electrical resistance of the oil film was also measured to evaluate the extent of the oil film formation. The major results are: (1) A decrease in the clearance ratio is effective in enhancing squeeze action on the entirety of the bearing pads, thereby improving the load carrying capacity. When the clearance ratio becomes too low, however, the ability to form an adequate wedge film is degraded, causing the load carrying capacity to decrease; (2) A significant improvement in the load carrying capacity can be expected, because incorporating the taper geometry on both sides of the oilgroove promotes a thicker oil film; and (3) A taper geometry with a subtended length of 5 degrees and a taper angle of 0.1 degree produces the maximum load carrying capacity.

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Section: Influence Of Taper Geometry Modified Oilgroovesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influences of Taper Geometry Modified Oil-Grooves on Load Carrying Capacity of Crosshead Bearings

Kitahara

Otsubo

Nakahara

2006

JSME Int. J., Ser. C

Self Cite

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“…However, research on the tribo-dynamic performance of a crosshead slipper-guide system remains scarce. Scholars have paid more attention to the tribological phenomena of other friction pairs such as piston rings [13][14][15][16], crosshead bearings [17,18], and crankpin bearings [19] in low-speed marine diesel engines. Moreover, such studies have only been carried out under the rated conditions.…”

Section: Introductionmentioning

confidence: 99%

Transient tribo-dynamic analysis of crosshead slipper in low-speed marine diesel engines during engine startup

Meng

Dong

et al. 2020

Friction

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A crosshead slipper-guide system, which bears a significant thrust force, is an essential friction pair in low-speed marine diesel engines. Owing to the low moving speed of the crosshead slipper during engine startup, it is difficult to form good hydrodynamic lubrication between the crosshead slipper and guide. Therefore, a detailed analysis of the crosshead slipper during engine startup is needed. In this study, a new transient tribo-dynamic model for a crosshead slipper during the engine startup process is presented. The model consists of a mixed lubrication model of the crosshead slipper-guide and dynamic models of the piston assembly, crosshead assembly, connecting rod, and crankshaft. The tribo-dynamic performances of the crosshead slipper during startup and under the rated conditions were simulated and compared. The results show that the tribo-dynamics of the crosshead slipper during the startup process are significantly different from those under the rated conditions. Some measures beneficial for the low friction of a crosshead slipper-guide under the rated conditions may significantly increase the friction loss of the crosshead slipper-guide system during the startup process.

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“…The test results showed that increasing the oil supply pressure can significantly improve the bearing capacity and oil film thickness. 8 Takasaki et al 9 carried out a study on the crosshead bearing lubrication in which the effect of the crosshead pin rotation was explored. The results showed that the rotation of the crosshead pin is beneficial to the crosshead bearing lubrication.…”

Section: Introductionmentioning

confidence: 99%

“…International J of Engine Research 22 (8) increased the friction loss. Figures 20(c) and (d) confirms this conjecture.…”

mentioning

confidence: 99%

Crosshead bearing analysis for low-speed marine diesel engines based on a multi-body tribo-dynamic model

Meng

Liu

et al. 2020

International Journal of Engine Research

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An optimized lubrication condition of the crosshead bearing in low-speed marine diesel engines is pivotal to its prolonged service life, because the bearing oscillates at a low speed and the direction of the high load is always downward. Theoretical studies on the tribology of the crosshead bearing are very limited, with existing studies ignoring the effects of connecting rod inertia. Herein, a new multi-body tribo-dynamic model for the engine is presented by coupling the dynamics models of the connecting rod, piston assembly, and crosshead assembly with the mixed lubrication models of the multiple lubricated joints including the crosshead bearing. Based on this new multi-body tribo-dynamic model, the bearing load, journal center trajectories, friction torque, and minimum oil film thickness were calculated and compared with those based on the simplified method used in the previous literatures. The results show that due to the connecting rod inertia, the bearing load in the transverse direction calculated by the simplified algorithm is different from that calculated by the tribo-dynamic model proposed in this study. Compared with the results based on the previous simplified method, the inertia of the connecting rod reduces the friction torque of the bearing, especially at the end of the upward stroke.

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Experimental Studies on an Externally Pressurized Crosshead-Pin Bearing.

Cited by 4 publications

References 0 publications

Influences of Taper Geometry Modified Oil-Grooves on Load Carrying Capacity of Crosshead Bearings

Influences of Taper Geometry Modified Oil-Grooves on Load Carrying Capacity of Crosshead Bearings

Transient tribo-dynamic analysis of crosshead slipper in low-speed marine diesel engines during engine startup

Crosshead bearing analysis for low-speed marine diesel engines based on a multi-body tribo-dynamic model

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