Matsushita Electric Works, Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Electric Works Power Tools Co., Ltd.

Panasonic Corporation

Panasonic Holdings Corporation

Hidenori Shimizu

Fumiaki Sawano

Atsushi Takeyama

Hiroshi Miyazaki

Koichi Hashimoto

Toshiharu Ohashi

Tadashi Arimura

Yoshinori Sainomoto

Tatsuhiko Matsumoto

Motoharu Muto

Hiroyuki Tsubakimoto

Kozo Kawai

Masaaki Okada

Kota Kitamura

Yosuke Ishida

Masaki Ikeda

Kenji Nakayama

Hiroaki Murakami

Masaaki Sakaue

Minoru Yoshida

Takashi Kusagawa

Akira Kawai

Naotake Tanaka

Masayuki Amano

Hiroki Inoue

Masatoshi Atsumi

Ichiro Kishi

Masari Muramatsu

Tsutomu Natsuhara

Akihiro Ishibashi

Mitsumasa Mizuno

Shinji Seko

Daiju Kinoshita

Tomohiro Hosokawa

Seiji Hashino

Yasuhiro Yamanaka

Tsuyoshi Yamane

Kouta Kitamura

Toshio Kudou

An electric power tool includes a holder, a motor, and a transmission mechanism. The motor includes a stator and a rotor. The rotor includes a rotary shaft and a rotor body. The rotary shaft is coupled to the transmission mechanism. The rotator includes at least the rotor body. The rotator rotates. The electric power tool further includes an absorbing member. The absorbing member has a property to absorb a lubricant. The absorbing member is arranged between the rotator and the transmission mechanism.

Electric power tool

An electric power tool includes a bearing retainer that retains a bearing for supporting a motor shaft, a transmission mechanism that transmits a rotational output of a motor to a front-end tool and a rotating body attached to an end of the motor shaft. The bearing retainer includes an extension that extends in a direction of axial line from an end face position on the bearing. At least a part of the rotating body is provided in front of a rear end of the extension.

A motor includes: a stator; a rotor axially aligned with the stator; a circuit board; and a heat dissipating plate. The stator includes: an iron core including teeth; an insulator covering one end surface, in the axial direction, of the iron core; and a coil wound around the teeth. The insulator includes an electrically insulating material having a lower rate of heat transfer than a material included in the iron core. The heat dissipating plate is attached to the insulator in a state in which the heat dissipating plate is in contact with the insulator without being in contact with the iron core, and the circuit board is attached to the heat dissipating plate in a state in which the circuit board is in contact with the heat dissipating plate without being in contact with the iron core.

Motor and electric tool equipped with the same

A brushless motor includes: a stator core having a cylindrical yoke portion and a teeth portion having a shape protruding from an inner circumferential surface of the yoke portion; and a rotor that is disposed inside the stator core, spaced apart from the teeth portion, and uses a center axis of the yoke portion as an axis of rotation. The yoke portion includes, on its outer circumferential surface, a notch portion at a position on the back side of the teeth portion. The notch portion has a circumferential width smaller than a circumferential width of the teeth portion.

Brushless motor and electrically powered tool

A holding pin protrudes from a first opening of a through hole, enters a hole formed in a tip tool, and holds the tip tool. A spring member energizes the holding pin. A bush is press-fitted in the through hole and supports the spring member at a first end portion thereof. An inner diameter of a second opening of the through hole is formed larger than an outer diameter of the bush. As a result of this, a second end portion of the bush is arranged to avoid contact with the second opening of the through hole.

Power tool

A power tool that is capable of more reliably keeping a torque at a constant is provided. An adjustment member is provided with: an engagement hole that is detachably attached to the adjustment member, and serves as an engagement part that engages with a torque adjustment device that serves as a clutch handle for rotating the adjustment member; and a lid that is attached to an opening in such a manner as to cover the engagement hole.

An electric power tool includes a motor having a drive shaft, a tool output shaft rotated by rotational force of the drive shaft, a clutch unit that connects or disconnects a torque transmission line between the drive shaft and the tool output shaft according to load torque of the tool output shaft, a load detector that outputs a load torque signal in accordance with the load torque of the tool output shaft, and a control unit that performs a rising detection mode, which detects rising of the load torque signal to stop rotation of the motor, and a falling detection mode, which detects falling of the load torque signal to stop rotation of the motor. The control unit selects the rising detection mode or the falling detection mode according to a usage condition signal indicating a usage condition of the electric power tool.

An electric power tool is included in a plurality of types of electric power tools. The plurality of types of electric power tools comprise a plurality of types of battery packs having different rated output voltages and a plurality of types of tool bodies, the housings of which are equipped with an attached part on which each of the battery packs is mounted in a freely removable manner. The attached part possessed by the plurality of types of tool bodies equipped with motors having different voltage characteristics is formed so as to be able to mount an arbitrary one of the plurality of types of battery packs having different rated output voltages. This makes it possible to widen the range of available battery packs and enhance convenience.

An electric tool comprises a removable battery packas a power supply, a motor M as a power source, a drive unit being driven by said motor, a switch SW as an operation input unit, and a control circuit CPU controlling the driving of said motor according to the operation of said switch. The electric tool further comprises a power supply connection unit that enables a plurality of battery pack types, which have different rated output voltages, to be selectively connected, and an identification means that identifies the type of said battery pack that has been connected. Said control circuit is configured to control an output of said motor based on identification information for the type of said battery pack that has been connected, provided by said identification means.

Electric tool

An electric power tool includes a motor, a speed reduction mechanism, a power output unit, a control circuit unit, and a housing. The housing provided with an air supply-exhaust hole. The motor includes a stator core wound with coils, a rotor core and an electronic circuit unit. The electronic circuit unit includes a circuit board, electronic components arranged in the circuit board and including a switching element, coil connection portions arranged in the circuit board and connected to the coils and a control circuit connection portion arranged in the circuit board and connected to the control circuit unit. The motor further includes a radiator member for dissipating heat generated in the switching element of the electronic circuit unit and an insulating cover member molded to cover the electronic components, the coil connection portions, the control circuit connection portion, the circuit board and the radiator member.

A rotary impact tool includes a drive shaft rotationally driven by a rotational drive power source, a hammer arranged around the drive shaft, a ball engaging with a cam groove formed on the outer circumferential surface of the drive shaft and a cam groove formed on the inner circumferential surface of the hammer, an anvil engageable with the hammer along a rotational direction and a spring for biasing the hammer toward the anvil. The hammer is designed to rotate along a rotational locus decided by the cam groove of the drive shaft and the cam groove of the hammer. The rotational locus of the hammer as seen in a development view describes a curve in which the lead angle of the rotational locus varies continuously with the change in hammer rotation angle.

Rotary impact tool

A power tool includes a power tool and a battery pack detachably attached to the power tool, the battery pack having two engaging portions to be mechanically coupled to the power tool and the power tool having engaged portions respectively corresponding to two engaging portions of the battery pack respectively. Each of engaging portions of the battery pack includes an insertion restricting portion and an attachment securing portion for allowing its corresponding engaged portion to be inserted only in a direction of pressing the attaching portion of the battery pack against the attached portion of the power tool, each of the attachment securing portions being coupled to its corresponding engaged portion. At least one of said at least two engaging portions further has a hook engaging portion which is selectively secured with an engaged portion moved from its corresponding insertion restricting portion to its corresponding attachment securing portion.

Power tool having a main body and a battery pack detachably attached to the main body

A brushless motor has a stator, a rotor and a circuit board for controlling rotation of the rotor. The stator has iron cores and coils wound around the iron cores. Switching elements for turning on and off electric power to be supplied to the coils for the stator are mounted to the circuit board. A heat-radiating member is fixed to the iron cores.

Brushless motor

A rotary impact tool can be used in a work especially precision or finishing of fastening is important. The rotary impact tool comprises a rotary driving mechanism including a driving source for rotating a driving shaft, a hammer fixed on the driving shaft, an output shaft to which a driving force is applied by impact blow of the hammer, a torque setting unit used for setting a fastening torque, a processor for calculating fastening torque from impact blow of the hammer, a rotation speed setting unit used for setting rotation speed of the driving shaft, and a controller for rotating the driving shaft of the rotary driving mechanism in a rotation speed set in the rotation speed setting unit and for stopping rotation of the driving shaft of the rotary driving mechanism when the fastening torque calculated in the processor becomes equal to or larger than a reference value of fastening torque previously set in the torque setting unit.

An electric power tool includes a main body having a tubular tool body part with an output portion at one end, and a battery pack detachably attached to the main body. The main body also has a grip portion extending from the tool body part radially downwardly. The grip portion has an attachment section formed at a bottom end portion thereof. The attachment section of the main body is provided with an engaged portion, the battery pack is provided at an upper region thereof with an engaging portion for engaging with the engaged portion and at a side region thereof with an operating portion for releasing the engagement of the engaging portion with the engaged portion.

Growing community of inventors

Hikone, Japan

Hidenori Shimizu