US 11,778,944 B2
Heat dissipation power head and lawn mower
Yu Xiao, Jiangsu (CN)
Assigned to Globe (Jiangsu) Co., Ltd, Changzhou (CN)
Filed by Globe (Jiangsu) Co., Ltd, Jiangsu (CN)
Filed on Dec. 4, 2020, as Appl. No. 17/111,521.
Claims priority of application No. 201911239774.9 (CN), filed on Dec. 6, 2019.
Prior Publication US 2021/0169007 A1, Jun. 10, 2021
Int. Cl. A01D 34/78 (2006.01); A01D 34/81 (2006.01); A01D 101/00 (2006.01)
CPC A01D 34/78 (2013.01) [A01D 34/81 (2013.01); A01D 2101/00 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A power head comprising:
a motor assembly, the motor assembly comprising a motor base and a motor fixed on the motor base;
an energy device; and
a housing assembly covering the motor assembly and the energy device, the housing assembly comprising a casing that is assembled with the motor base;
wherein an air inlet is located on the top of the casing and an air inlet cavity connected to the air inlet, the air inlet and the air inlet cavity are provided with two and arranged on the left and right sides of the casing, the air inlet cavity being a U-shaped structure with an upper opening, and the casing covering the top of the air inlet cavity to form a sealed airflow passage, the bottom of the motor base being sealed and the side of the motor base being provided with an air outlet, the cooling airflow entering the airflow passage from the air inlet and then flowing into the motor, and flowing out from the air outlet;
wherein the air inlet cavity comprises a first ramp provided near the air inlet and a second ramp provided away from the air inlet, and the first ramp facing the air inlet goes downhill to change a width of the air inlet cavity from wide to narrow along an airflow direction, the second ramp goes uphill towards the air inlet to change the width of the air inlet cavity from narrow to wide along the airflow direction.