“…The durability of internal combustion engine valves has been extensively researched in the past several decades (Newton, 1952;Newton et al, 1953;Tauschek, 1956;Johnson and Galen, 1966;Giles, 1966;Wang, 2007). An important comprehensive review on the heavy-duty diesel engine valve materials and designs in the last fifty years was provided by Schaefer et al (1997).…”
“…The durability of internal combustion engine valves has been extensively researched in the past several decades (Newton, 1952;Newton et al, 1953;Tauschek, 1956;Johnson and Galen, 1966;Giles, 1966;Wang, 2007). An important comprehensive review on the heavy-duty diesel engine valve materials and designs in the last fifty years was provided by Schaefer et al (1997).…”
“…Figure 6.Schematics of the wear test apparatus designed for valve guides reviewed: (a) Newton, et al. ; 25 (b) Rodrigues; 26 (c) Chikahata et al. ; 22 (d) Purohit et al.…”
Section: Design Of the New Mfwamentioning
confidence: 99%
“…Decades ago, Newton et al. investigated the wear properties of the valve stem in a furnace, 25 as illustrated in Figure 6(a). A crank connecting link was used to drive the valve stem.…”
The increasingly strict emission regulations in combustion engines are raising high requirements for the engine valve train system. In this paper, a novel multifunctional wear apparatus is designed to study the performance of engine valve train components. The apparatus employs a mechanical loading system, which consists of a special eccentric wheel and disc springs that apply the combustion loads, and the contact configurations and loading conditions of valve train components are simulated. It has three test functions for different components through specifically designed fixtures. The first function aims to evaluate the interaction between the valve seating face and the seat insert at high temperatures and loads. The second function is used to study the friction and wear properties of the valve stem and the valve guide. The third function is designed to evaluate the performance of the valve seals. At last, a verification test was carried out by the proposed experimental method. A pair of new exhaust valve and seat insert is tested for the performance evaluation of the first function. The wear mechanisms acting on the pairs interface are shown to be a combination of oxidative wear, adhesive wear, as well as fatigue flaking.
“…Valve wear can be caused by design factors namely, high seating velocity, low hardness of material and most importantly by fretting due to valve deflection under high cylinder pressure [1,2,3].…”
Wear is a characteristic of the engine system and a wide variety of conditions causes wear and damage of engine parts. In the current work, wear of the engine components are classified on the basis of fretting and adhesive phenomenon. In this regard, we formalized the knowledge of wear of inlet valve and liner quantitatively on the basis of operational and design aspects. Since there are many design and operational variables, the most important variables are selected and tuned by adding new features to the empirical models. Therefore, in the present work case studies on critical engine parts like inlet valve and liner are made to improve the wear behavior of the special components.
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