ELECTRIC WORKING MACHINE

• Main Author: SASAKI YOSHINOBU
• Format: Patent
• Language: English; Japanese
• Published: 19.11.2020
• Subjects: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDEDFOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOTPARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOTOTHERWISE PROVIDED FOR; HAND TOOLS; MANIPULATORS; PERFORMING OPERATIONS; PORTABLE POWER-DRIVEN TOOLS; TRANSPORTING

To effectively suppress occurrence of noise caused by a brushless motor on the side of a product structure without changing a specification of a motor.SOLUTION: A hammer drill 1 includes: a stator 10 having a cylindrical stator core 13 around which a coil 16 is wound through upper and lower insulators 14 and 15; a brushless motor 3 including a rotor 11 rotatable to the stator 10; a cylindrical part 32 which is fixed to the whole outer periphery of the stator core 13 and is composed of aluminum having Young's modulus higher than those of the upper and lower insulators 14 and 15; and a motor housing 2 storing the brushless motor 3 and the cylindrical part 32.SELECTED DRAWING: Figure 2 【課題】モータの仕様を変更することなく、製品構造側で、ブラシレスモータに起因する騒音の発生を効果的に抑制する。【解決手段】ハンマドリル１は、上下インシュレータ１４，１５を介してコイル１６が巻回される筒状のステータコア１３を有するステータ１０と、ステータ１０に対して回転可能なロータ１１とを含むブラシレスモータ３と、ステータコア１３の外周へ全周に亘って固定され、上下インシュレータ１４，１５よりもヤング率が高いアルミニウムからなる筒状部３２と、ブラシレスモータ３及び筒状部３２を収容するモータハウジング２とを有する。【選択図】図２