摘要:

The paper describes an interferometric method of determining the shape and thickness of the clastohydrodynamic oil film formed between a rotating ball loaded against a diamond, sapphire, or glass plate, and a rotating roller loaded against a glass plate. The film shape for both point and line contact is found to depend critically on speed and load. It is found that considerable departure from the static Hertzian shape occurs at quite low speeds. The line contact results show the extent of the end closure and its dependence on the blend radius of the roller.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Minneapolis, Minnesota, October 18–20, 1966.

ISSN:0569-8197    

DOI:10.1080/05698196708972181

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

A study is made of the passage of current, both DC and AC, through elastohydro-dynamically lubricated contacts using a 4-ball machine running at 175 rpm with 1 in Steel balls. At small applied voltages ∼15mV, when there is a coherent oil film, (i.e., when it is not short circuited by metallic contact) it behaves as an ohmic resistance. The resistance of the oil film varies from >101ohms down to 1 ohm. This has important implications for the concept of percentage metallic contact, and for the statistical contact method of assessing oil film thickness.

ISSN:0569-8197    

DOI:10.1080/05698196708972182

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Cylindrical roller bearings with annular rollers may be advantageous in applications where weight, lubrication, and speed are major considerations in the operation of the bearing. This discussion describes an analytical technique whereby the effects of the elastic and Hertzian distortions of the hollow rollers are considered in the determination of the bearing internal load distribution, fatigue life, and deflection. Numerical examples calculated for a bearing having annular rollers indicate that the distortion of the flexible rollers improve the load distribution permitting increased bearing fatigue life. The advantage must be compared with the increased bearing deflections and bending stresses in the hollow rollers to determine the adequacy of the bearing under given conditions of applied load and speed. Additionally, the skidding of the cylindrical roller bearing with annular rollers is considered for conditions of high speed and extremely light radial load.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Minneapolis, Minnesota, October 18–20, 1966.

ISSN:0569-8197    

DOI:10.1080/05698196708972183

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

To study the influence of lubricant physical and chemical properties on rolling contact fatigue, a variety of base stocks and additives were evaluated with a 4-ball type fatigue machine. The effect of viscosity was found to depend on the means by which a given viscosity was achieved. Although some commonly used EP and antiwear additives had a pronounced effect on fatigue life, the direction and magnitude of the additive effect depended on the particular additive and its concentration in the blend. In addition, it was observed that the additive effect depended on the choice of base oil and ball steel. These results indicate that the chemical properties as well as the physical properties of the lubricant, can be important in rolling contact fatigue.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Minneapolis, Minnesota, October 18–20, 1966.

ISSN:0569-8197    

DOI:10.1080/05698196708972184

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

A theoretical analysis of the turbulent operation of the visco seal is presented. The resulting turbulent sealing equation correlated well with test data. It is shown, that good sealing capability can be obtained over a wide range of geometrical variables. It was also found that for shaft diameters over 1 inch, curvature effects are small; and that within the accuracy of the test data, the sealing capability is independent of thread location, shaft or sleeve. Power loss for seals of length to diameter ratio greater than one can be conservatively estimated by treating the seal as a smooth shaft rotating in a close clearance sleeve and neglecting the grooves.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Minneapolis, Minnesota, October 18–20, 1966.

ISSN:0569-8197    

DOI:10.1080/05698196708972185

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

An experimental and visual investigation of the viscoseal operating regions was conducted. A mathematical model was formulated for the homogeneous fluid region which resulted in an evolution of a modified Reynolds' number based on two characteristic lengths. Importance of convective inertia forces and changes in the functional relations between variables in the super laminar flow regime are discussed. Correlation between modified Reynolds number and sealing-capacity improvement is found.

ISSN:0569-8197    

DOI:10.1080/05698196708972186

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

An investigation is made of the physical behavior of a viscoelastic-elastic layered system under the influence of a moving load. It is restricted to a quasi-stationary case within the plane strain theory, and the viscoelastic material is represented by a standard linear model in shear. The quasi-stationary nature of the surface deformation and interface shear stress are studied. The surface deformation is correlated with the coefficient of deformation friction through a newly developed criterion.

ISSN:0569-8197    

DOI:10.1080/05698196708972187

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

The hydrodynamic effect of viscoelasticity in bearing performance was investigated experimentally by measuring the pressure distribution of viscoelastic liquids and Newtonian liquids in a simulated plain journal bearing. The pressure distribution of the viscoelastic liquids was somewhat different from that of the Newtonian liquids, showing a flattening of the pressure profile and a shift of the circumferential position of the peak pressure. Such a difference contributes to a small recovery of the loss of the load-carrying capacity due to the non-Newtonian viscosity for viscoelastic liquids. It may also contribute to a further reduction of friction beyond the effect of shear thinning. The difference of cavitation on the divergent region of the bearing for these two different kinds of liquid was evident. The viscoelastic liquids showed less extent of cavitation. The experimental conditions conform closely to those used in the classical hydrodynamic lubrication theory. The experimental data indicate that the full fluid film occupies half a bearing starting at 0° and ending at 180°, and the subatmospheric pressure in the divergent region is leveled off at a certain negative pressure. Based on this boundary condition, a computer solution in solving the Reynolds equation for a finite bearing gives very good agreement with experiment.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Minneapolis, Minnesota, October 18–20, 1966.

ISSN:0569-8197    

DOI:10.1080/05698196708972188

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

This paper includes the predominant centripetal inertia terms in a comprehensive analysis of hydrostatic thrust bearings of spherical form. The analysis considers continuous spherical surfaces which are not interrupted by grooves and solutions are presented for spheres having radii equal to and less than the radius of the hemispherical seal.

ISSN:0569-8197    

DOI:10.1080/05698196708972189

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

This paper considers the performance of the spherical thrust bearing, known as the hydrosphere. The analytical and experimental work of Shaw and Strang is examined and experimental results presented to substantiate the authors' own inertia theory presented in their previous paper.

ISSN:0569-8197    

DOI:10.1080/05698196708972190

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor