US 11,732,637 B2
Engine assembly for a vehicle having a compressor
Christian Raffelsberger, Scharnstein (AT); Heinz Kusel, Pennewang (AT); Nigel Foxhall, Semriach (AT); Markus Doppelbauer, Gunskirchen (AT); Thomas Zorn, Stadl-Paura (AT); and Matthias Zarhuber, Thalheim bei Wels (AT)
Assigned to BRP-ROTAX GMBH & CO. KG, Gunskirchen (AT)
Filed by BRP-ROTAX GMBH & CO. KG, Gunskirchen (AT)
Filed on Dec. 17, 2021, as Appl. No. 17/554,023.
Claims priority of provisional application 63/126,674, filed on Dec. 17, 2020.
Prior Publication US 2022/0195914 A1, Jun. 23, 2022
Int. Cl. F02B 37/16 (2006.01); F02B 75/02 (2006.01); F01N 13/10 (2010.01); F02M 35/104 (2006.01); F02M 35/10 (2006.01); F02D 41/00 (2006.01)
CPC F02B 37/16 (2013.01) [F01N 13/10 (2013.01); F02B 75/02 (2013.01); F02D 41/0007 (2013.01); F02M 35/104 (2013.01); F02M 35/10157 (2013.01); F02B 2075/025 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An engine assembly for a vehicle, comprising:
an internal combustion engine operating on a two-stroke engine cycle, the engine comprising:
a crankcase;
a crankshaft disposed at least in part in the crankcase; and
a cylinder block connected to the crankcase,
the cylinder block defining at least one cylinder, each of the at least one cylinder defining an intake port and an exhaust port;
a compressor in fluid communication with the intake port of the at least one cylinder to pump air into the engine;
an exhaust valve assembly configured to control opening and closing of the exhaust port of the at least one cylinder in order to allow or impede passage of fluids through the exhaust port; and
an exhaust pipe in fluid communication with the exhaust port of the at least one cylinder to receive exhaust gas therefrom, the exhaust pipe having an inlet and an outlet defining a length of the exhaust pipe therebetween, a diameter of the exhaust pipe increasing along a portion of the length of the exhaust pipe in a flow direction of the exhaust pipe, the diameter of the exhaust pipe not decreasing along the length of the exhaust pipe in the flow direction of the exhaust pipe,
intake air being fed to the intake port without the air passing through the crankcase.
 
12. An engine assembly for a vehicle, comprising:
an internal combustion engine operating on a two-stroke engine cycle, the engine comprising:
a crankcase;
a crankshaft disposed at least in part in the crankcase; and
a cylinder block connected to the crankcase,
the cylinder block defining at least one cylinder, each of the at least one cylinder defining an intake port and an exhaust port;
a compressor in fluid communication with the intake port of the at least one cylinder to pump air into the engine;
an exhaust valve assembly configured to control opening and closing of the exhaust port of the at least one cylinder in order to allow or impede passage of fluids through the exhaust port;
an exhaust pipe in fluid communication with the exhaust port of the at least one cylinder to receive exhaust gas therefrom, the exhaust pipe having an inlet and an outlet defining a length of the exhaust pipe therebetween, a diameter of the exhaust pipe increasing along a portion of the length of the exhaust pipe in a flow direction of the exhaust pipe, the diameter of the exhaust pipe not decreasing along the length of the exhaust pipe in the flow direction of the exhaust pipe; and
a plenum fluidly connected between the compressor and the intake port of the at least one cylinder, the plenum being disposed vertically below the compressor.