Vehicle motor rotor shaft

A rotor assembly for an electric motor assembly of a vehicle defining a forward direction and a rearward direction, and comprising:

• a rotor core comprising a rotor body defining a first rotor core passage and a second rotor core passage positioned in the rearward direction of the first rotor core passage;
• and
• a rotor shaft disposed at least partially within the rotor core and defining a rotational axis extending in the forward direction and rearward direction and comprising:
• a shaft body having an inner bore therethrough delimited by an inner surface of the shaft body;
• a first shaft passage extending radially outward from the inner surface of the shaft body, and the first shaft passage fluidly coupled to the first rotor core passage;
• a second shaft passage positioned in the rearward direction of the first shaft passage and extending radially outward from the inner surface of the shaft body, the second shaft passage fluidly coupled to the second rotor core passage;
• a fluid source fluidly coupled to the inner bore to feed fluid to the inner bore;
• and
• a flow splitter disposed in the inner bore forming a first split flowpath and a second split flowpath,
• wherein flow of the fluid from the fluid source is split by the flow splitter between the first split flowpath and the second split flowpath,
• wherein the fluid passing through the first split flowpath bypasses the first shaft passage and enters the second shaft passage,
• wherein at least a portion of the fluid passing through the second split flowpath enters the first shaft passage,
• wherein the flow splitter comprises an annular dam having a radial outer side contacting an entire perimeter of the inner bore,
• wherein the annular dam is positioned at a rearward end of the flow splitter, and
• wherein an opening is formed on a radial inner side of the annular dam through which a portion of the fluid abutting the annular dam is configured to pass.

A vehicle comprising:

• an electric motor assembly comprising a rotor assembly, the rotor assembly comprising:
• a rotor core comprising a rotor body defining a first rotor core passage and a second rotor core passage positioned in a rearward direction of the first rotor core passage;
• and
• a rotor shaft disposed at least partially within the rotor core and defining a rotational axis extending in a forward direction and rearward direction and comprising:
• a shaft body having an inner bore therethrough delimited by an inner surface of the shaft body;
• a first shaft passage extending radially outward from the inner surface of the shaft body, and the first shaft passage fluidly coupled to the first rotor core passage;
• a second shaft passage positioned in the rearward direction of the first shaft passage and extending radially outward from the inner surface of the shaft body, the second shaft passage fluidly coupled to the second rotor core passage;
• a fluid source fluidly coupled to the inner bore to feed fluid to the inner bore;
• and
• a flow splitter disposed in the inner bore forming a first split flowpath and a second split flowpath,
• wherein flow of the fluid from the fluid source is split by the flow splitter between the first split flowpath and the second split flowpath,
• wherein the fluid passing through the first split flowpath bypasses the first shaft passage and enters the second shaft passage, and
• wherein at least a portion of the fluid passing through the second split flowpath enters the first shaft passage,
• wherein the flow splitter comprises an annular dam having a radial outer side contacting an entire perimeter of the inner bore,
• wherein the annular dam is positioned at a rearward end of the flow splitter, and
• wherein an opening is formed on a radial inner side of the annular dam through which a portion of the fluid abutting the annular dam is configured to pass.