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US 8,757,028 B2Granted
Crankshaft for a two-stroke engine
AssigneeBRP US Inc.
InventorsGeorge Broughton, Andrew Findlay, John Valek, James E. Macier
Life of this patent
Estimating the term…
Abstract
A crankshaft has a receiving platform for catching lubricant dropping from a main bearing assembly. The receiving platform has at least one wall disposed thereon. The wall has one point that is the furthest from the rotational axis of the crankshaft. One channel is defined in the platform and has an inlet disposed close to the point of the wall that is furthest from the rotational axis of the crankshaft. The channel has an outlet in the vicinity of a connecting rod bearing assembly, so that lubricant dropped on the receiving platform will flow to the connecting rod bearing assembly.
Claims25
A crankshaft for a two-stroke engine having a crankshaft body defining a rotational axis, the crankshaft comprising:
- at least one main bearing journal connected to the crankshaft body;
- at least one crankpin connected to the crankshaft body, the at least one crankpin being axially spaced from the at least one main bearing journal;
- at least one receiving platform connected to the crankshaft body, the at least one receiving platform being disposed between the at least one main bearing journal and the at least one crankpin;
- the at least one receiving platform having a top surface and a bottom surface, the top surface being disposed between the bottom surface and the at least one main bearing journal, the top surface having an edge and a wall, portions of the wall being non-equidistant from the rotational axis and one of the portions of the wall being furthest from the rotational axis, the one of the portions being an outermost portion;
- and
- at least one channel defined at least in part within the at least one receiving platform, the at least one channel having a channel inlet and a channel outlet,
- the channel inlet being disposed between the outermost portion and the rotational axis, in proximity to the outermost portion, and
- the channel outlet being disposed in proximity to the at least one crankpin.
5 more elements
A crankshaft for a two-stroke engine having a crankshaft body defining a rotational axis, the crankshaft comprising:
- at least one main bearing journal connected to the crankshaft body;
- at least one crankpin connected to the crankshaft body, the at least one crankpin being axially spaced from the at least one main bearing journal;
- at least one receiving platform connected to the crankshaft body, the at least one receiving platform being disposed between the at least one main bearing journal and the at least one crankpin,
- the at least one receiving platform having a top surface and a bottom surface, the top surface being disposed between the bottom surface and the at least one main bearing journal, the top surface having an edge and at least one wall, portions of the at least one wall being non-equidistant from the rotational axis and at least one portion of the at least one wall being more distant from the rotational axis than other portions of the at least one wall, the at least one portion of the at least one wall being at least one outer portion;
- and
- at least one channel defined at least in part within the at least one receiving platform, the at least one channel having a channel inlet and a channel outlet,
- the channel inlet being disposed between the at least one outer portion and the rotational axis, in proximity to the at least one outer portion, and
- the channel outlet being disposed in proximity to the at least one crankpin.
5 more elements
A crankshaft for a two-stroke engine having a crankshaft body defining a rotational axis, the crankshaft comprising:
- at least one main bearing journal connected to the crankshaft body;
- at least one crankpin connected to the crankshaft body, the at least one crankpin being axially spaced from the at least one main bearing journal;
- at least one receiving platform connected to the crankshaft body, the at least one receiving platform being disposed between the at least one main bearing journal and the at least one crankpin,
- the at least one receiving platform having a top surface and a bottom surface, the top surface being disposed between the bottom surface and the at least one main bearing journal, the top surface having an edge and a wall defining a closed perimeter, portions of the closed perimeter being non-equidistant from the rotational axis and at least one portion of the closed perimeter being more distant from the rotational axis than other portions of the closed perimeter, the at least one portion of the closed perimeter being at least one outer portion;
- and
- at least one channel defined at least in part within the at least one receiving platform, the at least one channel having a channel inlet and a channel outlet,
- the channel inlet being disposed within the closed perimeter in proximity to the at least one outer portion, and
- the channel outlet being disposed in proximity to the at least one crankpin.
5 more elements
A two-stroke engine comprising:
- an engine casing;
- at least one cylinder disposed within the engine casing;
- at least one piston movable within the at least one cylinder;
- a crankshaft having a crankshaft body defining a rotational axis, the crankshaft comprising at least one main bearing journal, at least one crankpin and at least one receiving platform having a top surface and a bottom surface, the at least one main bearing journal, the at least one crankpin and the at least one receiving platform being connected to the crankshaft body, the at least one crankpin being axially spaced from the at least one main bearing journal and the at least one receiving platform being disposed so that the top surface is disposed between the bottom surface and at least one main bearing journal;
- the crankshaft being rotatably mounted within the engine casing via at least one main bearing assembly comprising a main bearing body and one of the at least one main bearing journal, the main bearing body being connected to the engine casing;
- at least one connecting rod having a first end and a second end, the first end being operatively connected to the at least one piston and the second end being rotatably connected to the crankshaft via a connecting rod bearing assembly comprising a connecting rod body and one of the at least one crankpin, the connecting rod body being connected to the second end of the connecting rod;
- the top surface of the at least one receiving platform having an edge and a wall, portions of the wall being non-equidistant from the rotational axis and one of the portions of the wall being furthest from the rotational axis, the one of the portions being an outermost portion;
- and
- at least one channel defined at least in part within the at least one receiving platform, the at least one channel having a channel inlet and a channel outlet,
- the channel inlet being disposed between the outermost portion and the rotational axis, in proximity to the outermost portion, and
- the channel outlet being disposed in proximity to the connecting rod bearing assembly of one of the at least one connecting rod.
8 more elements
Dependencies are inferred from the claim text.