Konturhonen auf dem Prüfstand

Maisch, Christian; Böhm, Hans-Peter

doi:10.1007/978-3-662-63608-4_8

Cited by 1 publication

(2 citation statements)

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“…An advance approach regards this deformation with an inverse conical shape in the cold state, shown on the right in Figure 2. The advanced manufacturing process required for this is already partly applied in mass production [5]. However, due to the varying wall thickness of the surrounding components and the resulting circumferentially changing heat transfer, different radial deformation forms are to be expected in the piston liner cross-section on each height (see Figure 3), which can be approximated by Fourier series [4].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, this can lead to oil entry into the combustion chamber (reverse blow-by) and it is one reason for higher emissions. Conversely, a tighter sealing results in a higher friction force [5][6][7][8][9][10][11][12][13][14][15][16]. As part of the "Powertrain 2025" project [17], cylinder liners are being developed to reduce energy consumption in both manufacturing and operational phases.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of a Free-Form Honed Cylinder Liner for Heavy-Duty Engines

Stelljes,

Pohlmann-Tasche,

Dinkelacker

2024

Lubricants

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For future internal combustion engines, driven by regenerative fuels, efficiency is more important than ever. One approach to reduce the losses inside the piston cylinder unit (PCU) is to improve the alignment of the liner and the piston. Therefore, a cylinder liner with a free form was developed at the Institute of Technical Combustion (ITV) of the Leibniz University Hannover which compensates radial and linear deformations along the stroke. The layout is based on a FEM simulation. The liner was manufactured by the Institute of Production Engineering and Machine Tools (IFW) of Leibniz University of Hannover with a novel turn-milling process. The liner was investigated on the heavy-duty Floating-Liner engine of ITV with a displacement of 1991 ccm and a bore diameter of 130 mm. The experimental results show improvement in the friction losses over the whole engine map in the range of 9% and up to 17.3% compared to a serial liner. Sealing efficiency could be improved up to 28.8%, depending on the operational point. Overall, the investigation aims for lower fuel consumption which would in result fewer emissions.

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Section: Introductionmentioning

confidence: 99%