Analysis of dynamics and friction resistance in the cam-tappet system

Siczek, Krzysztof; Stefański, Andrzej

doi:10.15632/jtam-pl.57.1.273

Cited by 3 publications

(3 citation statements)

References 21 publications

(23 reference statements)

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“…In civil engineering, when switching between train tracks and roads suddenly. Jerk and snap have many applications in oscillators, manufacturing and motion control, see [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Resolutions of the Jerk and Snap Vectors for a Quasi Curve in Euclidean 3-Space

et al. 2021

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This work aims at studying resolutions of the jerk and snap vectors of a point particle moving along a quasi curve in Euclidean 3-space E3. In particular, we obtain the resolution of the jerk and snap vectors along the quasi vectors and offer an alternative resolution of the jerk and snap vectors along the tangential direction and two special radial directions that lie in the osculating and rectifying planes. This alternative resolution for a quasi plane curve in Euclidean 3-space E3 is given as corollary. Moreover, our results are illustrated via some examples.

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“…In civil engineering, when switching between train tracks and roads suddenly. Jerk and snap have many applications in oscillators, manufacturing and motion control, see [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Resolutions of the Jerk and Snap Vectors for a Quasi Curve in Euclidean 3-Space

et al. 2021

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“…An increasing number of factors are considered in the flexible dynamic model. These factors include the clearance of the follower guide [ 16 ] and the friction of the cam–tappet pair [ 17 ]. Nevertheless, previous studies have ignored the effect of camshaft dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…The flexibility of the camshaft drastically affects the dynamic behaviour of the valve train [ 19 , 20 , 21 ]. The gyroscopic effect of the rotor disc [ 22 ], the presence of eccentricity [ 23 ] and the multidirection vibrations of the camshaft [ 17 , 24 ] have also been considered in the dynamic models of valve trains.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of Dynamic Characteristics for a Valve Train System

Yin

2021

Sensors

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The valve train is one of the main sources of engine vibration, and its dynamic performance is crucial for output power and fuel consumption. The flexibilities of slender bars and beams should be emphasised in the design of valve trains to develop high-power and high-speed engines with industrial applications. A flexible dynamic model of a valve train system is proposed. In the proposed model, the components, except the cam and gear bodies, are modelled as flexible bodies with multidirectional deformations. The gyroscopic effects of the camshaft, cams and gear discs are also considered to predict dynamic responses at high speeds accurately. Gear meshing, the friction of the cam–tappet pair, the centrifugal force of the cams and valve clearance are also considered. Experiments on housing vibration and pushrod stress are conducted to validate the proposed model. Results show that the proposed model can predict the dynamic stress of the flexible components well and predict the trend shown by the housing vibration. The proposed model shows that excessive cam rotation speed and valve clearance will cause intense bounce and jump phenomena. The proposed model can be an important reference for designing engine work speed, adjusting valve clearance and improving component durability.

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Wear Performance of Circular Shim against Cam in Engine Bench Test

Wang

Han

et al. 2022

Materials

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Unlike the conventional engine, the valve train of a certain type of engine uses a circular shim instead of a tappet to wear against the cam. To verify the reliability of the shim, an engine bench test was used to test its wear performance. The total duration of the bench test was 1000 h, which was divided into three stages. In each stage, the test equipment was stopped, and the shims were disassembled to observe the surface morphology during the worn process. Precious long-term data were obtained. With the extension of the bench test time, weight loss increased. The maximum weight loss occurs 1000 h after worn, which is about twice that of 350 h. During the wear process, a plastic flow of material was found on the subsurface, and fatigue wear marks occurred on the surface. With an increase in test time, the wear marks increased, leading to material spalling and the formation of pits. The wear mechanism was the mixed wear of fatigue wear and adhesive wear.

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Analysis of dynamics and friction resistance in the cam-tappet system

Cited by 3 publications

References 21 publications

Resolutions of the Jerk and Snap Vectors for a Quasi Curve in Euclidean 3-Space

Resolutions of the Jerk and Snap Vectors for a Quasi Curve in Euclidean 3-Space

Theoretical and Experimental Analysis of Dynamic Characteristics for a Valve Train System

Wear Performance of Circular Shim against Cam in Engine Bench Test

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