Core drill
A core drill includes: a motor having a rotor, which is rotatable relative to a stator about a rotational axis extending in the front-rear direction; a speed-reducing mechanism, which is disposed more forward than the stator; an output shaft, at least a portion of which is disposed more forward than the speed-reducing mechanism and which, in the state in which a core bit is mounted thereon, is rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism; a battery-mounting part, on which a battery pack is mounted; a motor-housing part, which houses the motor; a grip part, at least a portion of which is disposed along the extension of the rotational axis more rearward than the motor-housing part; and a controller, which controls the motor. In the front-rear direction, at least a portion of the controller is disposed between the motor and the grip part.
1. A core drill comprising:
a motor comprising a stator and a rotor, which is rotatable relative to the stator about a rotational axis extending in the front-rear direction;
a speed-reducing mechanism, which is disposed more forward than the stator;
an output shaft, at least a portion of which is disposed more forward than the speed-reducing mechanism and which, in the state in which a core bit is mounted thereon, is rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism;
a battery-mounting part, on which a battery pack is mountable;
a motor-housing part, which houses the motor;
a grip part disposed more rearward than the motor-housing part such that at least a portion of the grip part is intersected by the rotational axis;
a trigger disposed on the grip part; and
at least a first controller configured to control energization of the motor;
wherein:
in the front-rear direction, at least a portion of the first controller is disposed between the motor and the grip part; and
a virtual line that is colinear with the rotational axis intersects the trigger and the first controller.
2. The core drill according to claim 1 , comprising:
a controller-housing part, which is disposed between the motor-housing part and the grip part;
wherein the first controller is housed in the controller-housing part.
3. The core drill according to claim 2 , wherein an air-intake port is defined in the controller-housing part.
4. The core drill according to claim 2 , further comprising:
air-intake ports defined in the controller-housing part and extending perpendicular to the rotational axis, and
air-exhaust ports defined in the motor-housing part and extending perpendicular to the rotational axis,
wherein an intermediate portion of an airflow path inside the motor-housing part extends parallel to the rotational axis.
5. The core drill according to claim 4 , wherein the airflow path further comprises:
a first end portion fluidly connecting the air-intake ports to the intermediate portion of the airflow path, the first end portion extending perpendicular to the rotational axis; and
a second end portion fluidly connecting the intermediate portion to the air-exhaust ports, the second end portion also extending perpendicular to the rotational axis.
6. The core drill according to claim 5 , wherein the first controller comprises a circuit board defining a plane that extends perpendicular to the rotational axis.
7. The core drill according to claim 6 , wherein the air-intake ports extend in parallel to the plane of the circuit board.
8. The core drill according to claim 1 , further comprising:
a second controller;
wherein:
the first controller is housed in the grip part; and
the second controller is disposed between the motor and the grip part.
9. The core drill according to claim 1 , further comprising:
a second controller;
wherein each of the first controller and the second controller is disposed between the motor and the grip part.
10. The core drill according to claim 1 , wherein the first controller includes at least one power FET electrically connected to the motor.
11. The core drill according to claim 1 , wherein the rotational axis is colinear or parallel to the output shaft.
12. A core drill comprising:
a motor comprising a stator and a rotor, which is rotatable relative to the stator about a rotational axis extending in the front-rear direction;
a speed-reducing mechanism, which is disposed more forward than the stator;
an output shaft, at least a portion of which is disposed more forward than the speed-reducing mechanism and which, in the state in which a core bit is mounted thereon, is rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism;
a battery-mounting part, on which a battery pack is mountable;
a motor-housing part, which houses the motor;
a grip part disposed more rearward than the motor-housing part;
a trigger disposed on the grip part; and
a controller configured to control energization of the motor;
wherein:
the controller comprises a circuit board defining a plane that extends parallel to the rotational axis; and
a virtual line that is colinear with the rotational axis intersects the trigger.
13. The core drill according to claim 12 , wherein the controller is disposed downward of the motor.
14. The core drill according to claim 12 , further comprising:
a battery-connection part, which holds the battery-mounting part;
wherein the controller is housed in the battery-connection part.
15. The core drill according to claim 14 , further comprising:
an air-intake port defined in the battery-connection part.
16. The core drill according to claim 12 , wherein at least a portion of the controller is housed in a lower-grip part of the grip part.
17. The core drill according to claim 16 , further comprising:
an air-intake port defined in the lower-grip part.
18. A core drill comprising:
a motor comprising a stator and a rotor, which is rotatable relative to the stator about a rotational axis extending in the front-rear direction;
a speed-reducing mechanism, which is disposed more forward than the stator;
an output shaft, at least a portion of which is disposed more forward than the speed-reducing mechanism and which, in the state in which a core bit is mounted thereon, is rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism;
a battery-mounting part, on which a battery pack is mountable;
a motor-housing part, which houses the motor;
a grip part disposed more rearward than the motor-housing part such that at least a portion of the grip part is intersected by the rotational axis; and
a controller configured to control energization of the motor;
wherein:
in the front-rear direction, at least a portion of the controller is disposed between the motor and the grip part; and
the controller is entirely disposed more rearward than the battery-mounting part.
19. The core drill according to claim 18 , wherein a virtual line that is colinear with the rotational axis intersects a trigger disposed on the grip part.