Influence of pitch and exploitation on the frictional behaviour of the silent chains

2019 ◽  
Vol 234 (7) ◽  
pp. 2079-2085
Author(s):  
Mihai Tiberiu Lates ◽  
Radu Velicu ◽  
Lenard Jurj
Keyword(s):  
Automotive Industry ◽  
Frictional Torque ◽  
Combustion Engines ◽  
Test Rig ◽  
Mixed Friction ◽  
Test Parameters ◽  
Lubrication Oil ◽  
Frictional Behaviour

The silent chain transmissions are widely used in automotive industry as part of the distribution transmission for the combustion engines. The investigation of friction loses in chains is important in order to find out the influence of their constructive and exploitation parameters. The paper presents the results of the tests performed on a test rig used in the case of transmissions with parallel axes. The main contribution of the paper is represented by determining the influence of speed, tensioning force, temperature and pitch on the friction loses of silent chains. Two types of silent chains are tested: LD6 with the pitch equal with 6.35 mm and LD8 with the pitch equal with 8 mm. The tests have been achieved with the following test parameters: the driver sprocket rotations with the values of 500, 1000, 1800 and 5000 r/min; the tensioning force with the values of 0.5, 1, 2 and 3 kN; the lubrication oil temperature equal with 40°C, 90°C and 115°C. Conclusions are drawn regarding the influence of the chains’ pitch and of the exploitation parameters on the frictional torque. The presence of boundary or mixed friction in the joints of the chain explains the frictional behaviour of the chain.

Frictional Behavior of Glass Fiber Reinforced Polyester under Different Loads

2007 ◽  
Vol 561-565 ◽  
pp. 639-642
Author(s):  
Jan Quintelier ◽  
Filip Van den Abeele ◽  
Liesbet De Doncker ◽  
Wim De Waele ◽  
Joris Degrieck ◽  
...  
Keyword(s):  
Friction Force ◽  
Fibre Orientation ◽  
Test Rig ◽  
Trigger Mechanism ◽  
Frictional Behavior ◽  
Glass Fiber Reinforced ◽  
Pin On Disc ◽  
Glass Fibre Reinforced ◽  
The Difference ◽  
Frictional Behaviour

Pultruded glass fibre reinforced polyester where used to investigated the frictional behaviour of the 45° fibre orientation. Therefore, on a rebuild Pin-on-disc test rig, using composite discs and steel pins, the frictional behaviour of these materials is investigated. Due to the indicated fibre orientation, and a simple trigger mechanism, it was possible to distinguish the friction force for different fibre orientations. The classical know orientations, parallel and perpendicular to the direction of sliding provided expected results, for both cases. The ~45° orientation, which is extremely important regarding filament wounded bearings, behaved in both cases similar -- regarding friction force-- in an unexpected way. The friction force of the 45° orientation was higher in all cases, and the amount was similar to the difference between the parallel and perpendicular case. These findings yield the conclusion that the 45° orientations cannot be neglected in frictional studies, and the behaviour of weft-warp structures also determines performance.

scholarly journals Assessment of the potential of dimethyl ether as an alternative fuel for compression ignition engines

2017 ◽  
Vol 169 (2) ◽  
pp. 181-186
Author(s):  
Rafał SMOLEC ◽  
Marek IDZIOR ◽  
Wojciech KARPIUK ◽  
Miłosław KOZAK
Keyword(s):  
Natural Resources ◽  
Crude Oil ◽  
Dimethyl Ether ◽  
Automotive Industry ◽  
Alternative Fuel ◽  
Exhaust Emissions ◽  
Combustion Engines ◽  
Compression Ignition ◽  
Compression Ignition Engines

The main problem that the automotive industry has been dealing with since the beginning of the XXI century is the need to reduce the exhaust emissions from piston combustion engines. Another, not at all less important problem is the depleting natural resources of crude oil. There are many concepts aiming at resolving of the said issues. One of them is the possibility of application of dimethyl ether (DME) in a classic engine. The paper characterizes this fuel, drawing attention to the aspects related to the adaptation of the engine to this type of fuel, presents the process of its atomization and relevant exhaust emissions.

scholarly journals Impact of Leakage Inlet Swirl Angle in a Rotor–Stator Cavity on Flow Pattern, Radial Pressure Distribution and Frictional Torque in a Wide Circumferential Reynolds Number Range

2020 ◽  
Vol 5 (2) ◽  
pp. 7
Author(s):  
Tilman Raphael Schröder ◽  
Hans-Josef Dohmen ◽  
Dieter Brillert ◽  
Friedrich-Karl Benra
Keyword(s):  
Reynolds Number ◽  
Radial Pressure ◽  
Cavity Flow ◽  
Frictional Torque ◽  
Leakage Flow ◽  
Test Rig ◽  
Axial Thrust ◽  
Number Range ◽  
Swirl Angle ◽  
Through Flow

In the side-chambers of radial turbomachinery, which are rotor–stator cavities, complex flow patterns develop that contribute substantially to axial thrust on the shaft and frictional torque on the rotor. Moreover, leakage flow through the side-chambers may occur in both centripetal and centrifugal directions which significantly influences rotor–stator cavity flow and has to be carefully taken into account in the design process: precise correlations quantifying the effects of rotor–stator cavity flow are needed to design reliable, highly efficient turbomachines. This paper presents an experimental investigation of centripetal leakage flow with and without pre-swirl in rotor–stator cavities through combining the experimental results of two test rigs: a hydraulic test rig covering the Reynolds number range of 4 × 10 5 ≤ R e ≤ 3 × 10 6 and a test rig for gaseous rotor–stator cavity flow operating at 2 × 10 7 ≤ R e ≤ 2 × 10 8 . This covers the operating ranges of hydraulic and thermal turbomachinery. In rotor–stator cavities, the Reynolds number R e is defined as R e = Ω b 2 ν with angular rotor velocity Ω , rotor outer radius b and kinematic viscosity ν . The influence of circumferential Reynolds number, axial gap width and centripetal through-flow on the radial pressure distribution, axial thrust and frictional torque is presented, with the through-flow being characterised by its mass flow rate and swirl angle at the inlet. The results present a comprehensive insight into the flow in rotor–stator cavities with superposed centripetal through-flow and provide an extended database to aid the turbomachinery design process.

Development of Tribological Test Equipment and Measurement of Galling Resistance of Various Grades of Stainless Steel

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
A. P. Harsha ◽  
P. K. Limaye ◽  
Rajnesh Tyagi ◽  
Ankit Gupta
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Room Temperature ◽  
Adhesive Wear ◽  
Test Method ◽  
Frictional Torque ◽  
Online Measurement ◽  
Test Rig ◽  
Tribological Test ◽  
Ss 304

A mechanized galling tester has been developed to evaluate the galling resistance of material pairs at room temperature (RT) as well as at elevated temperature condition. The test rig has a facility for online measurement of frictional torque during the test which is useful in assessing the incipient scoring. Both the test rig and the test method conform to the recent ASTM G196-08 standard. Galling resistance of two different grades of stainless steel SS 304 and 304 L has been evaluated in self-mated condition at RT and elevated temperature (300 °C). The parameter called galling50 has been reported for the materials tested. The galled surface indicated the severe plastic deformation in the direction of sliding and it is dominated by the typical adhesive wear mechanism. The recent ASTM G196-08 test method for measurement of galling resistance of material pairs appears to be superior to an older ASTM G98 because galling behavior was prevailed by the stochastic wear phenomenon.

Hardware in the Loop Test Rig for Development of Control Algorithms for Electric Vehicles

2013 ◽  
Vol 198 ◽  
pp. 507-512
Author(s):  
Florian Quantmeyer ◽  
Xiao Bo Liu-Henke
Keyword(s):  
Control Systems ◽  
Electric Vehicles ◽  
Automotive Industry ◽  
Control Algorithms ◽  
Hardware In The Loop ◽  
Test Rig ◽  
Control Functions ◽  
Systems And Control ◽  
High Flexibility ◽  
And Control

Political pressure on the automotive industry will lead in future to an increasing electrification of the powertrain. The new components require the development of new vehicle control systems and control functions. Due to the high complexity of such systems the mechatronical development process including Model in the Loop (MIL), Software in the Loop (SIL) and Hardware in the Loop (HIL) simulation has been established. In this paper, a HiL test rig is presented, which has high flexibility and supports the model based development of control systems for battery electric vehicles at all levels.

Influence of the Mixture Formation on the Lubrication Oil Emission of Combustion Engines

2010 ◽  
Vol 3 (1) ◽  
pp. 733-744 ◽  
Author(s):  
Marcus Gohl ◽  
Sven Brandt ◽  
Michael Wittler ◽  
Matthias Budde ◽  
Gunter Knoll ◽  
...  
Keyword(s):  
Combustion Engines ◽  
Mixture Formation ◽  
Lubrication Oil

Different Approaches for Determination of Internal Combustion Engines Performances

2016 ◽  
Vol 822 ◽  
pp. 169-174
Author(s):  
Alexandru Mihai Dima ◽  
Dragos Tutunea ◽  
Marin Bica
Keyword(s):  
Automotive Industry ◽  
World Economy ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Engine Performance ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Continue Development ◽  
The World

The automotive industry represents one of the most important segments of the world economy that has to be in a continue development. The latest procedures for determination of an internal combustion engine performance have a big acquisition cost and demand special conditions even if the tested engine has smaller dimensions. The present paper presents other accessible solutions for this matter.

Heat Treating of EV Transmissions

2021 ◽  
Author(s):  
Dennis Beauchesne
Keyword(s):  
Automotive Industry ◽  
Internal Combustion Engines ◽  
Heat Treating ◽  
Combustion Engines ◽  
Vacuum Carburizing ◽  
Heat Treat ◽  
The World ◽  
Gear Manufacturing ◽  
New Challenges ◽  
Lower Tolerance

Abstract As consumers embrace Electric Vehicle (EV) technology, the automotive industry is moving quickly into replacing internal combustion engines (ICE) and traditional transmissions. The change to electrically driven vehicles offers new challenges to the gear manufacturing world, and most importantly new specifications to heat treat these gears - specifically quieter gear sets and higher torque ratings. Today’s EVs have a much lower tolerance for noise from the gear set to power the vehicle; therefore, this continues the need for even quieter and stronger gears. This technical presentation will illustrate the heat treat and distortion specifications for these new gears, along with answering the “why” of selecting low pressure vacuum carburizing (LPC) for new programs around the world.

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