Debanshu Roy

SKF Engineering and Lubrication · RTD GTCI

The aim of this present investigation is to estimate the generated contact stresses, deformations and gaps at all ideally form-closed active contacts of GEROTOR® pump (a unique HSLT hydrostatic unit) during operation. These analyses have been done for one complete cycle of the star-ring set of GEROTOR pump considering splined shaft as an input of a...

Chambers in the Gerotor pump units are separated by metal-to-metal geometrically form-closed higher pair active contacts in the lobes of star and ring components. With rotation when the chamber volumes expand and contract, the active contacts move on lobe profiles and are subjected to deformations due to contact stress caused by fluid pressure and...

ORBIT® motors and GEROTOR® pumps are widely used in medium range pressure applications due to their poor leakage characteristics. Improving the leakage characteristics of such units is still a challenging area of research. In the present study, deformations/gaps which occur at all ideally form-closed active contacts in epitrochoid (cycloidal class)...

We estimate deformations or gaps occurring at all the ideally form-closed contacts, that separate the chambers, in epitrochoid (cycloidal class) generated star-ring gears of ORBIT® motors. The direct measurement of these deformations and gaps is not an easy task as the contact positions are inaccessible for installing any measuring device. Therefor...

An attempt is made to analyze the effect of varied flow input /output orifice area gradient at entry/exit, on the chamber pressures of ORBIT motors. It is done by varying the inclination of axial groove on rotary flow distributor pintle valve. The constructional and functional features of the flow distributor valve are discussed in details. Next, v...

In the present investigation, an analysis is carried out in FEM simulation software (Ansys ®), to predict the deformations and gaps at active contacts in cycloidal class toothed starring of ORBIT ® motor. Detailed geometries and kinematic of ORBIT motor are included in the modeling. Following Maiti's assumptions in earlier investigation, the outer...

In this paper, an attempt has been made to analyze the effect of spool port/ groove geometry on the pressure drop and chamber pressures which effect the performance parameters of the flow distributor valve. The work mainly involves formulation of detailed mathematical model of the valve and compare them on the same platform. For mathematical modell...

An analysis is carried out to predict inter-chamber leakage flows through the two transition active contacts, which separate the high pressure chambers from the adjacent low pressure chambers, in the cycloidal class toothed starring of ORBIT® motors. Among geometrically form closed contacts which separates chambers from each other, few active conta...

The leakage past the tooth flanks of the gears in transition contacts in involute external toothed gear pump is analyzed in details using CFD in Fluent®. Analytical results support the experimentally visualized flow patterns [1]. Extending the approach of an earlier investigation [2] more rigorous analyses are carried out considering actual gear da...

This study was undertaken to observe the effect of nano-composite coating on steel surface for enhancing its tribological properties. In the investigation, EN31 steel surfaces were coated with nano-composite (Ni-WS2) by pulse current co-deposition process in order to improve the tribological properties of the surface. The coatings were prepared acc...

WS2 particulates were incorporated in the Nickel matrix through electro deposition process, to obtain a composite coating with improved tribological properties. EN31 steel was used as the work piece for the electro deposition process. Different characterisation processes, such as, microstructure examination, XRD analysis, wear and friction behaviou...

The wear-resistance properties of nickel coating in high temperature (up to 400o C) application and in corrosive environment can be improved by introducing WS2 particulates into the nickel coating. Nickel is a strong corrosion-resistant material and tungsten disulfide is a solid state lubricant. The mixed deposition of both the materials on the tri...

In this paper, pulse co-deposited micron sized (average 10 µm) tungsten carbide (WC) particles in nickel metal matrix composites (MMC) were investigated. Ni-WC composite coatings were prepared in Watt's bath under the influence of varying current density and duty cycle. It was found that current density of 0.02 A/cm 2 was sufficient to start the co...

The present research is focused on the electrodeposition of composite coating by the use of DC current. Nickel metal is used as matrix and the WS2 particulate of average size (0.89-1.7μm) is used as reinforcing agent. Nickel is a strong corrosion resistant material and tungsten disulfide is a solid state lubricant. Circular disc like samples has be...