US 12,140,151 B2
Turbo fan
Kenji Shiraki, Chiba (JP); Hideki Yoshiura, Chiba (JP); Tetsushi Yoshikawa, Chiba (JP); and Sakie Kawakami, Chiba (JP)
Assigned to MABUCHI MOTOR CO., LTD., Chiba (JP)
Filed by MABUCHI MOTOR CO., LTD., Chiba (JP)
Filed on Jul. 14, 2023, as Appl. No. 18/352,247.
Claims priority of application No. 2022-114855 (JP), filed on Jul. 19, 2022.
Prior Publication US 2024/0026897 A1, Jan. 25, 2024
Int. Cl. F04D 29/28 (2006.01); B23K 20/10 (2006.01)
CPC F04D 29/281 (2013.01) [B23K 20/10 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A turbo fan formed by welding together, by ultrasonic welding, a first component including: a flat portion that extends along a direction orthogonal to a rotation center; and a plurality of plate-shaped blade portions that is provided in such a manner as to stand from the flat portion and is provided around the rotation center in such a manner as to extend outward from the rotation center side, and a plate-shaped second component that is provided with a plurality of recessed groove portions in each of which an extended end portion of the respective blade portion fits, wherein
the groove portions have a groove width greater than a thickness of the end portions of the blade portions,
the turbo fan includes one group of positioning ribs that partially bury two clearances created on two sides of a respective end portion in a thickness direction thereof, in a state where the end portion fits in the groove portion,
the one group of positioning ribs protrude in the thickness direction from the end portion of at least one of the plurality of blade portions and are in contact with side surfaces of the groove portion, or protrude in the thickness direction from side surfaces of at least one of the plurality of groove portions and are in contact with the end portion of the blade portion, and
the positioning rib provided to one of the two clearances is equal in an amount of protrusion in the thickness direction to the positioning rib provided to the other clearance.