Design and operation of a new multifunctional wear apparatus for engine valve train components

2017 ◽  
Vol 232 (3) ◽  
pp. 259-276 ◽  
Author(s):  
Fuqiang Lai ◽  
Shengguan Qu ◽  
Lianmin Yin ◽  
Guanghong Wang ◽  
Zhangxuan Yang ◽  
...  
Keyword(s):  
Valve Train ◽  
Combustion Engines ◽  
Wear Properties ◽  
Engine Valve ◽  
Valve Stem ◽  
Emission Regulations ◽  
Loading System ◽  
Seat Insert ◽  
Eccentric Wheel ◽  
Train System

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.

Dynamic analysis of a car engine valve train system

2016 ◽  
Vol 12 (3) ◽  
pp. 229 ◽  
Author(s):  
Enrico Armentani ◽  
Francesco Sbarbati ◽  
Michele Perrella ◽  
Roberto Guglielmo Citarella
Keyword(s):  
Dynamic Analysis ◽  
Valve Train ◽  
Engine Valve ◽  
Train System

Dynamic analysis of a car engine valve train system

2016 ◽  
Vol 12 (3) ◽  
pp. 229 ◽  
Author(s):  
Michele Perrella ◽  
Francesco Sbarbati ◽  
Enrico Armentani ◽  
Roberto Guglielmo Citarella
Keyword(s):  
Dynamic Analysis ◽  
Valve Train ◽  
Engine Valve ◽  
Train System

scholarly journals Conceptual Design of a Hydraulic Valve Train System

10.14311/248 ◽  
2001 ◽  
Vol 41 (4-5) ◽  
Author(s):  
J. Pohl ◽  
A. Warell ◽  
P. Krus ◽  
J.-O. Palmberg
Keyword(s):  
Integrated Approach ◽  
Valve Train ◽  
Design Parameters ◽  
Combustion Engines ◽  
Variable Valve Train ◽  
Critical Components ◽  
Variable Valve ◽  
Component Models ◽  
Train System

Variable valve train systems have been brought into focus during recent years as a means to decrease fuel consumption in tomorrow's combustion engines. In this paper an integrated approach, called simulation driven experiments, is utilised in order to aid the development of such highly dynamic systems. Through the use of systematic design methodology, a number of feasible concepts are developed. Critical components are subsequently identified using simulation. In this approach, component behaviour is simulated and validated by measurements on prototype components. These models are unified with complete system models of hydraulically actuated valve trains. In the case of the valve trains systems studied here component models could be validated using comparably simple test set-ups. These models enable the determination of non-critical design parameters in an optimal sense. This results in a number of optimised concepts facilitating an impartial functional concept selection.

Engine Valve Motion Simulated with Mechanical Dynamics

2012 ◽  
Vol 164 ◽  
pp. 429-432
Author(s):  
Zong Zheng Ma ◽  
Xin Li Wang
Keyword(s):  
High Frequency ◽  
Valve Train ◽  
Motion Simulation ◽  
Engine Valve ◽  
Valve System ◽  
Valve Motion ◽  
Mechanical Dynamics ◽  
The Impact ◽  
Train System

One of the important methods for studying the valve train system is simulation. So the feasibility of valve motion simulation by Pro/E is discussed in this paper. After model establishing and connection completing, the valve motion is simulated and some results are reached. It can be seen from the results that valve motion can be simulated based on Pro/E environment. It also be seen that the valve acceleration varied at high frequency and the impact between the valve and seat is existed for the studied valve system. For studied valve it meets the demand of the engine

Improving the tribological behavior of internal combustion engines via the addition of nanoparticles to engine oils

2015 ◽  
Vol 4 (4) ◽  
Author(s):  
Mohamed Kamal Ahmed Ali ◽  
Hou Xianjun
Keyword(s):  
Internal Combustion Engines ◽  
Tribological Behavior ◽  
Internal Combustion ◽  
Valve Train ◽  
Combustion Engines ◽  
Power Losses ◽  
Oil Consumption ◽  
Engine Oils ◽  
Engine Efficiency ◽  
Sliding Surfaces

AbstractThe friction between two sliding surfaces is probably one of the oldest problems in mechanics. Frictional losses in any I.C. engine vary between 17% and 19% of the total indicated horse power. The performance of internal combustion engines in terms of frictional power loss, fuel consumption, oil consumption, and harmful exhaust emissions is closely related to the friction force and wear between moving parts of the engine such as piston assembly, valve train, and bearings. To solve this problem, most modern research in the area of Nanotribology (Nanolubricants) aims to improve surface properties, reduce frictional power losses, increase engine efficiency, and reduce consumed fuel and cost of maintenance. Nanolubricants contain different nanoparticles such as Cu, CuO, TiO

Nonlinear Transient Response of a High Speed Driven Valve System and Stresses in Valve Springs for Internal Combustion Engines

1989 ◽  
Vol 111 (3) ◽  
pp. 264-271 ◽  
Author(s):  
K. Nagaya
Keyword(s):  
High Speed ◽  
Internal Combustion Engines ◽  
Three Dimensional ◽  
Beam Theory ◽  
Internal Combustion ◽  
Valve Train ◽  
Combination Method ◽  
Combustion Engines ◽  
Valve System ◽  
Cam Profile

This paper presents a method for solving the dynamic response problems of a driven valve system and the stress problem of valve springs for internal combustion engines. In this system there is hysteresis behavior in the spring constants during the rotation of the cam shaft. To treat this nonlinearity, the rigidity of each section is assumed to be one of a partly linear spring. For the valve trains, the cam profile is complex in general. To treat a general cam profile, this paper applies a combination method of the Fourier expansion, the Laplace transform and the analytical connection methods, and gives a response of valve trains. This paper also presents a theoretical result for the stresses in the valve spring due to the motion of the valve train based on the three dimensional curved beam theory.

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