公开(公告)号：US20200338780A1

公开(公告)日：2020-10-29

申请号：US16854249

申请日：2020-04-21

Applicant: MAKITA CORPORATION

Inventor： Yoshifumi Watanabe ,  Junichi Masuda ,  Hideki Kachi ,  Tsunahisa Nakamura

IPC: B27B17/08 ,  B27B17/12

Abstract: A chain saw may comprise a braking mechanism; a housing including a first space and a second space in which the braking mechanism is disposed; and an operation member. The housing may include a through hole communicating the second space to outside of the housing. The operation member may be disposed over the second space and the outside of the housing through the through hole. The operation member may be movable between a braking position where the operation member causes the braking mechanism to interrupt rotation of a saw chain and a driving position where the operation member causes the braking mechanism not to interrupt the rotation of the saw chain. The braking mechanism may comprise a connecting member that moves in the second space in conjunction with movement of the operation member. The housing may include an opening communicating the first space to the second space.

公开(公告)号：US09726070B2

公开(公告)日：2017-08-08

申请号：US14261945

申请日：2014-04-25

Applicant: MAKITA CORPORATION

Inventor： Kenji Imafuku ,  Yoshifumi Watanabe ,  Hideaki Hirano ,  Junichi Masuda

IPC: F02B25/00 ,  F02B29/00 ,  F02M35/10 ,  F02B25/22 ,  F02B25/14 ,  F02F7/00 ,  F02B63/02 ,  F02B75/02

CPC classification number: F02B29/00 ,  F02B25/14 ,  F02B25/22 ,  F02B63/02 ,  F02B2075/025 ,  F02F7/0036 ,  F02M35/1019

Abstract: An air-leading type, stratified scavenging two-stroke engine. The engine including a cylinder member and a crankcase joined therewith has an intake passage, an exhaust passage, first and second scavenging passages, a communicating portion and an air passage. The intake passage, the exhaust passage and the air passage are formed in the cylinder member. The first and the second scavenging passages each has a cylinder member-side passage and a crankcase-side passage. The cylinder member-side passages of both of the first and the second scavenging passages communicate with each other via the communicating portion. The air passage is connected to the cylinder member-side passage of the first scavenging passage. In the engine, air for pre-scavenging is introduced from the air passage through a check valve into the cylinder member-side passage of the first scavenging passage, and a part of the introduced air flows into the second scavenging passage through the communicating portion.

公开(公告)号：US09719416B2

公开(公告)日：2017-08-01

申请号：US14262013

申请日：2014-04-25

Applicant: MAKITA CORPORATION

Inventor： Kenji Imafuku ,  Junichi Masuda ,  Yoshifumi Watanabe ,  Hideaki Hirano

IPC: F02B75/02 ,  F02B25/22 ,  F02B25/14 ,  F02B63/02

CPC classification number: F02B75/02 ,  F02B25/14 ,  F02B25/22 ,  F02B63/02 ,  F02B2075/025

Abstract: A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder.