摘要:

Systematic measurements with a disk machine of the thickness of the lubricating film separating the surfaces of heavily loaded rollers have been made, and the variation of film thickness with applied load and rolling speed has been studied. It was found that the results can be expressed by:

ISSN:0569-8197    

DOI:10.1080/05698196408972051

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Results of tests on both heavily loaded gears of 12 DP and 35 mm bore ball bearings are reported. The gears and bearings were operated at unit compressive stresses upto 113,000 psi and 199,000 psi respectively, at pressures from 1 × 10−6to 7 × 10−9torr and temperatures from −180 to 300°F. The lubrication technique for the gears and bearings made use of composite materials containing a metal matrix, a film former, and a load carrying component.Contributed by the ASLE Aerospace Council and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972052

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Tests were made at low loads and moderate temperatures with sliders and ball bearings operating in test chambers each being continuously evacuated by an ion pump. The test chamber-ion pump system was used to simulate the loss of volatile matter from a bearing envelope through an opening to the space vacuum. Unlubricated specimens, MoS2-based films, soft metal films, self-lubricating materials, and oil lubrication were evaluated. In the slider tests, low friction was obtained with several MoS2-based lubricants, with no evidence of lubricant failure in up to 460 days vacuum exposure. Wear was kept minimal, so as not to obscure vacuum exposure effects. A ball bearing with an epoxy-MoS2composition retainer gave the best performance—low friction without evidence of malfunction for 900 million revolutions (420 days of vacuum exposure). Pressure measurements during tests indicated that volatile matter was released by the rubbing process.Contributed to the American Society of Lubrication Engineers by the author.

ISSN:0569-8197    

DOI:10.1080/05698196408972053

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The mechanism of extreme-pressure (EP) lubrication has been studied with various approaches in a number of laboratories over the past years. An investigation in this area was initiated recently in this laboratory with a modified four-ball tester [Manteuffel and Wolfram, ASLE Trans.3, 157] wherein the lubricant temperature leaving the ball interfaces is recorded as the load is continuously increased. The patterns of the temperature-load curves generated under these conditions are dependent on the lubricant compositions.

ISSN:0569-8197    

DOI:10.1080/05698196408972054

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Some secondary effects which can influence the operation of self-acting gas-lubricated bearings are analyzed, i.e., effect of the inertia forces, thermal effects, turbulence, and effect of the molecular character of the flow. In order to point out their qualitative influence as well as the conditions in which such influences can be important, the case of infinitely long bearings is considered, but for the computation of quantitative effects, the real case of finite bearings is used.Contributed by the ASLE Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972055

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

An externally pressurized circular thrust gas-bearing with multiple supply holes and no recesses is investigated theoretically by means of the complex potential theory.

ISSN:0569-8197    

DOI:10.1080/05698196408972056

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

Lumped and distributed parameter analyses of the inherently compensated gas journal bearing are developed for small eccentricity ratios. Curves are presented for static and dynamic gas film forces and for bearing gas flow requirements. Experimental results are compared with the theories for the case of plane vibration.Contributed by the ASLE Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972057

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The externally pressurized, gas-lubricated journal bearing consisting of a porous bushing, through which gas enters the clearance space, is analyzed. The classical Reynolds' equation for laminar, isothermal, compressible flow in a finite journal bearing is modified to allow for the local mass flow through the porous bushing into the clearance space due to the difference between the constant supply pressure and the pressure within the bearing. At low mass flow rates, it is assumed that the flow in the porous bushing obeys the Darcy equation for isothermal, compressible “creeping flow.” The analysis is extended to include bearings with higher flow rates by a simple modification of the Darcy equation.

ISSN:0569-8197    

DOI:10.1080/05698196408972058

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

The fluid pressure between two parallel circular plates separated by a relatively thin film of oil was measured during sinusoidal axial vibration of the top plate. The results of the experiment were compared with those predicted by inertialess considerations and an approximate solution which considers the fluid inertia. On the basis of this investigation, in which Reynolds' number was varied up to a value of three, the inertialess solution gives good results for the film pressure for Reynolds' number up to about 0.4; at higher values, pressures greater than those predicted by inertialess considerations were obtained. An approximate solution considering the fluid inertia is shown to be in good agreement with the test data which can be represented by a third-degree polynomial equation.Contributed by the ASLE Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964.

ISSN:0569-8197    

DOI:10.1080/05698196408972059

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor

摘要:

A numerical solution is presented for the problem of a circular, hydrostatic thrust bearing with central fluid supply, under the conditions of negligible rotational speed and isothermal boundaries.

ISSN:0569-8197    

DOI:10.1080/05698196408972060

出版商:Taylor & Francis Group    

年代:1964

数据来源: Taylor