公开(公告)号：US20250129794A1

公开(公告)日：2025-04-24

申请号：US18910083

申请日：2024-10-09

Applicant: Milwaukee Electric Tool Corporation

Inventor： Adam F. Czerwonka ,  Sourav Sen ,  Nathaniel A. Herrera

IPC: F04D29/66 ,  F04D19/00 ,  F04D29/52

Abstract: Blower/vacuum tools having reduced fan blade noise are provided. A blower/vacuum tool includes a main body extending between a first end and a second end defining an airflow conduit therethrough; and a fan assembly. The fan assembly includes an axial fan having a number of fan blades (nb), and a motor rotatably connected to the fan. In some embodiments, when ng is in a range from 17-45, the axial fan has a Blade Solidity in a range from 0.0464nb≤Blade Solidity≤0.089nb calculated by the equation Blade Solidity=c/s where c is the length of the chord line of the fan blades, s=2πrm/nb, and rm is the mean radius of the fan blades. In some embodiments, when the motor operates at a speed of between 21000-38000 rotations per minute (RPM), blade pass frequency (BPF) of the fan assembly as defined by the equation B ⁢ P ⁢ F = ( R ⁢ P ⁢ M 6 ⁢ 0 ) * ( # ⁢ of ⁢ blades )  is greater than 6 KHz.

公开(公告)号：US20250040478A1

公开(公告)日：2025-02-06

申请号：US18792736

申请日：2024-08-02

Applicant: Milwaukee Electric Tool Corporation

Inventor： Tabrez Mahamad ,  Scott Libert ,  Scott Liu ,  Everest Liu ,  Dave Yao ,  Calvin Vanko ,  Jeniffer Ordonez ,  Sourav Sen ,  Robert Long

IPC: A01D34/416 ,  A01D34/90 ,  A01D101/00

Abstract: String trimmers are provided. A stringer trimmer includes a housing; a control board including control circuitry; a frame coupled to the control board; and an isolator disposed between the housing and the frame, wherein the frame is supported relative to the housing by the isolator, and wherein the isolator comprises a shock absorbing material.