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1

A new scuffing shock test method for the determination of the resistance to scuffing of coated gears

Tuszynski W., Michalczewski R., Szczerek M., Kalbarczyk M.

Archives of Civil and Mechanical Engineering

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2012

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Vol. 12, no. 4

436--445

EN

An improvement in the scuffing resistance of toothed gears is achievable by e.g. the deposition of thin, hard coatings onto the gear teeth. However, the testing of the scuffing resistance of coated gears requires the application of specialised test methods. This paper presents a new test method, designed by the authors, called “gear scuffing shock test for coatings”. This method is based on the test method denoted as FZG S-A10/16,6R/110 developed at the Technical University of Munich. Because the FZG test method is dedicated exclusively to lubricating oils, its application for testing coated gears required introducing significant modifications. The developed method has been verified during the testing of the scuffing resistance of gears coated with the low-friction a-C:H:W coating and composite low-friction MoS2/Ti coating. Various material combinations were tested: coating–coating (both gears coated), coating-steel, steel-coating, and for reference steel–steel (both gears uncoated). Mineral, automotive gear oil of API GL-5 performance level, and SAE 80W-90-viscosity grade was used for lubrication. It has been shown that this test method can be successfully applicable to test the scuffing resistance of coated gears - it has a resolution good enough to differentiate between the tested material combinations.

2

Continuously variable transmission - construction and functioning

Korczak W.

Logistyka

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2008

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nr 2

EN

In this paper Continuously Variable Transmissions - CVTs are presented. Three types of CVTs - their constructions and functioning - are shown. The author pay attention on such questions like: features and benefits from using CVTs in vehicles.

PL

W referacie przedstawiono budowę oraz funkcjonowanie bezstopniowych skrzyń biegów CVT. Omówiono zasady funkcjonowania trzech typów skrzyń CVT wraz z ich budową. Zwrócono uwagę na korzyści płynące z zastosowania skrzyń CVT w pojazdach osobowych i użytkowych.

3

A parametric model of sprinting with speed limited by rotational inertia of the legs

Gentle R.

Acta of Bioengineering and Biomechanics

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2001

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Vol. 3, nr 1

5-14

EN

The development of a simple, semi-analytical parametric model of sprinting, particularly for the 60 m indoor sprint, is described. The overall aim is to produce a tool for studying the influence of a range of physiological and external parameters on the time it takes to complete this event. The basis of the model is the hypothesis that maximum speed is limited by the fact that there is a minimum time for the sprinter's front leg to be rotationally accelerated backwards from its outstretched position to the vertical position at which the foot strikes the ground. This angular acceleration is linked via estimates of the leg's mass and moments of inertia to the linear acceleration of the athlete at the start of the race, allowing a velocity/time diagram to be constructed for the whole motion. The effect of a change to the mass of the shoe is then studied as an example of the model's usefulness.