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US 11,766,773 B2Granted
Power tool
AssigneeKoki Holdings Co., Ltd.
InventorsNaoki Tadokoro, Ken Inui
Life of this patent
Estimating the term…
Abstract
There is provided a power tool including a housing, a brushless motor, a power supply circuit, and a fan. The housing is formed with an inlet hole and an exhaust hole. The brushless motor is supported by the housing. The power supply circuit includes at least one circuit element for supplying electric power of a power source to the brushless motor. The fan is driven by rotation of the brushless motor to generate a cooling air flow that flows from the inlet hole to the exhaust hole in the housing. The housing includes a first housing including a grip portion and supporting the brushless motor. The inlet hole is formed in the first housing. The at least one circuit element is disposed inside the first housing and is cooled by the cooling air flow.
Claims20
A power tool comprising:
- a housing;
- a brushless motor including a rotation shaft which extends in a front-rear direction;
- a control circuit controlling the brushless motor;
- and
- a circuit board on which at least part of the control circuit is mounted,
- wherein the housing comprises:
- a motor case having a motor accommodating portion which accommodates therein the brushless motor and has a hollow cylindrical shape;
- and
- a first housing covering at least a part of the motor case and comprising a grip portion extending in a direction intersecting the front-rear direction,
- the first housing is configured separately from the motor case and has an inner wall that covers at least a portion of the motor case in a radial direction of the brushless motor,
- wherein at least a part of the circuit board is disposed inside a space provided between the motor case and the inner wall in the radial direction of the brushless motor.
8 more elements
A power tool comprising:
- a housing formed with an inlet hole and an exhaust hole;
- a brushless motor having a rotor and a stator;
- a power supply circuit comprising at least one circuit element for supplying electric power of a power source to the brushless motor;
- a fan driven by rotation of the brushless motor to generate a cooling air flow flowing from the inlet hole to the exhaust hole in the housing;
- a board on which the at least one circuit element is mounted;
- and
- a board case formed in a container shape and accommodating therein the board,
- wherein the housing comprises a first housing, the first housing comprising a grip portion and supporting the brushless motor,
- wherein the inlet hole is formed in the first housing;
- wherein the at least one circuit element is disposed inside the first housing and is cooled by the cooling air flow,
- wherein the brushless motor comprises a rotation shaft portion extending in a front-rear direction,
- wherein the housing further comprises a motor case having a hollow cylindrical shape,
- wherein the first housing is formed by assembling two divided housing halves together in a left-right direction and having an accommodating portion which is disposed at below the motor case and accommodates at least a part of the board case,
- wherein the board case is nipped and supported by the two divided housing halves,
- wherein the brushless motor is supported by the motor case,
- wherein the board case is positioned in the first housing so that the board case inclines with respect to the front-rear direction so that a front end of the board case is positioned above a rear end of the board case, and at least a part of the board case is positioned inside the accommodating portion, and the front end of the board case is positioned frontward of the front end of the stator.
13 more elements
A power tool comprising:
- a housing;
- an inlet hole provided in the housing for taking in an air outside the housing into the interior of the housing;
- an exhaust hole provided in the housing for discharging the air inside the housing to the outside of the housing;
- a brushless motor supported by the housing and having a rotating shaft extending along a first direction;
- a switching element supplying power to the brushless motor;
- a control circuit controlling the switching element;
- a fan driven by rotation of the brushless motor to generate a cooling air flow flowing from the inlet hole to the exhaust hole in the housing;
- a board case supporting the control circuit,
- wherein the housing comprises a first housing, the first housing comprising a grip portion extending in a direction crossing the first direction and the first housing supporting the brushless motor,
- wherein the inlet hole is formed in the first housing;
- wherein the switching element is disposed inside the first housing and is cooled by the cooling air flow,
- wherein the first housing is formed by assembling two divided housing halves together in a second direction crossing the first direction,
- wherein the board case is nipped and supported by the two divided housing halves at a position between the grip portion of the first housing and the brushless motor in the first direction,
- wherein at least part of the inlet hole is positioned between the board case and the brushless motor in the first direction.
11 more elements
Dependencies are inferred from the claim text.