Pure rolling elastohydrodynamic lubrication of short stroke reciprocating motion

Wang, J.; Hashimoto, Tomihito; Nishikawa, Hiroshi; Kaneta, M.

doi:10.1016/j.triboint.2005.07.022

Cited by 44 publications

(36 citation statements)

References 17 publications

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“…Fig. 5, over the entire workingcycle, the grease film distribution did not exhibit the typical feature of reciprocating oil film: the entrapment of lubricant at the stroke end when the maximum central film arrived at its maximum just a little after the stroke center [4,5].…”

Section: Steady Statementioning

confidence: 91%

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Response of grease film at low speeds under pure rolling reciprocating motion

Han

Wang

et al. 2019

Friction

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Using an optical interferometric technique, the grease film distribution under a pure rolling reciprocating motion is observed on a ball-disk test rig, to explore the transient response of grease, which is expected to fill the contact with thickener fiber and run for a long time under steady-state conditions. It is found that the reciprocating motion reduces the accumulation of the thickener fiber gradually with time. The maximum film thickness forms around the stroke ends. After 1,000 working cycles, very severe starvation occurs so that either the central or minimum film thickness becomes nearly constant over one working period. Thus, the life of grease lubrication under a transient condition is far below that under steady-state conditions. However, it is also found that by selecting a smaller stroke length, the thickener fiber spreads out in the contact instead of being removed from the contact at the 1,000th working period. When increasing the maximum entraining speed of the reciprocating motion to a certain value, during which the thickener fiber is not expected to accumulate under a steady-state condition, severe starvation occurs very quickly, causing surface damage.

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Section: Steady Statementioning

confidence: 91%

“…5(a) and 5(l), the grease film shapes as well as the midsection film thickness were not identical. The upward entrapment was mainly owing to the large or small aggregation of the thickener fiber, other than the squeeze effect [4,5,8]. If we compare Fig.…”

Section: Reciprocating Motionmentioning

confidence: 98%

Response of grease film at low speeds under pure rolling reciprocating motion

Han

Wang

et al. 2019

Friction

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“…Gershuni et al [18] conducted ball-on-disk tests and observed the grease replenishment. Wang et al [19] measured and analyzed the oil film thickness under pure rolling reciprocating motions. They found that using the EHL theory based on starved lubrication produced results very close to the experimental values.…”

Section: Open Accessmentioning

confidence: 99%

Relationship between Supplied Oil Flow Rates and Oil Film Thicknesses under Starved Elastohydrodynamic Lubrication

Maruyama¹,

Saitoh²

2015

Lubricants

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Many studies have already considered starved lubrication. However, there have been no reports on the oil film thicknesses under steady starved EHL (elastohydrodynamic lubrication), where the ultra-low volume of oil supplied per unit time is uniform. The present study examined the relationship between the supplied oil flow rate and oil film thickness under steady starved lubrication. A ball-on-disk testing machine was used in experiments to measure the oil film thickness by means of optical interferometry. A microsyringe pump was used to accurately control the supplied oil flow rate. The supplied oil flow rate was kept constant, and the minimum oil film thickness was measured for 1 h after the start of the tests to determine the relationship between the supplied oil flow rate and oil film thickness.

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“…Of all associated machines, a typical example is the sevenbar pure-rolling cutting mechanism, which generates purerolling motion between two contacting bodies [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Kinematic Design of a Seven‐Bar Linkage with Optimized Centrodes for Pure‐Rolling Cutting

Liu

Wang

et al. 2017

Mathematical Problems in Engineering

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A novel method for designing a seven-bar linkage based on the optimization of centrodes is presented in this paper. The proposed method is applied to the design of a pure-rolling cutting mechanism, wherein close interrelation between the contacting lines and centrodes of two pure-rolling bodies is formulated and the genetic optimization algorithm is adopted for the dimensional synthesis of the mechanism. The optimization is conducted to minimize the error between mechanism centrodes and the expected trajectories, subject to the design requirements of the opening distance, the maximum amount of overlap error, and peak value of shearing force. An optimal solution is obtained and the analysis results show that the horizontal slipping and standard deviation of the lowest moving points of the upper shear blade have been reduced by 78.0% and 80.1% and the peak value of shear stress decreases by 29%, which indicate better cutting performance and long service life.

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Pure rolling elastohydrodynamic lubrication of short stroke reciprocating motion

Cited by 44 publications

References 17 publications

Response of grease film at low speeds under pure rolling reciprocating motion

Response of grease film at low speeds under pure rolling reciprocating motion

Relationship between Supplied Oil Flow Rates and Oil Film Thicknesses under Starved Elastohydrodynamic Lubrication

Kinematic Design of a Seven‐Bar Linkage with Optimized Centrodes for Pure‐Rolling Cutting

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