Power tool

Patent metadata

Field	Value
Publication number	US-11529729-B2
Application number	US-202016845268-A
Country	US
Kind code	B2
Filing date	Apr 10, 2020
Priority date	Aug 8, 2019
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

A power tool includes a body housing including a first grip, inlet facing a front surface of the first grip, first outlet, and second outlet; a brushless motor held on the body housing and including a rotational shaft; an output unit supported on the body housing in a reciprocable manner; a power transmission mechanism between the brushless motor and the output unit in the body housing to transmit rotational motion of the rotational shaft to the output unit; a controller held on the body housing to control the brushless motor; and a fan held on the body housing and mounted on the rotational shaft. The body housing allows air drawn through the inlet and having cooled the brushless motor to be divided into first and second outlet blows respectively cooling the power transmission mechanism and discharged through the first outlet, and cooling the controller and discharged through the second outlet.

First claim

What is claimed is:

1. A power tool, comprising:
a body housing including
a first grip,
an inlet facing a front surface of the first grip,
a first outlet, and
a second outlet;

a brushless motor held on the body housing and including a rotational shaft;
an output unit supported on the body housing in a reciprocable manner;
a power transmission mechanism located between the brushless motor and the output unit in the body housing to transmit rotational motion of the rotational shaft to the output unit;
a controller held on the body housing to control the brushless motor;
a fan held on the body housing and mounted on the rotational shaft; and
a second grip located in a front portion of the body housing, wherein
the body housing is configured to divide air drawn through the inlet and having cooled the brushless motor into a first outlet blow for cooling the power transmission mechanism and being discharged through the first outlet and a second outlet blow for cooling the controller and being discharged through the second outlet,
the output unit is located in front of the power transmission mechanism, and
the first outlet is located in front of the fan and behind the second grip.

2. The power tool according to claim 1 , wherein
the controller is located below the fan.

3. The power tool according to claim 2 , wherein
the first outlet is adjacent to a side surface of a front portion of the power transmission mechanism.

4. The power tool according to claim 2 , wherein
the body housing includes a bulge protruding outward, and
the bulge has the first outlet.

5. The power tool according to claim 2 , wherein
the first grip extends vertically,
the power tool further includes an upper joint connecting an upper end of the first grip with the body housing outside the brushless motor and the controller, and
a lower joint connecting a lower end of the first grip with the body housing outside the brushless motor and the controller, and
the second outlet is located in front of the lower joint.

6. The power tool according to claim 1 , wherein
the first outlet is adjacent to a side surface of a front portion of the power transmission mechanism.

7. The power tool according to claim 6 , wherein
the body housing includes a bulge protruding outward, and
the bulge has the first outlet.

8. The power tool according to claim 1 , wherein
the body housing includes a bulge protruding outward, and
the bulge has the first outlet.

9. The power tool according to claim 1 , further comprising:
a battery mount on which a battery is mountable to power the brushless motor,
wherein the second outlet is located below and in front of the battery mount.

10. The power tool according to claim 1 , wherein
the body housing includes a cover, and
the cover has the first outlet.

11. The power tool according to claim 1 , wherein
the power transmission mechanism is a reciprocating conversion mechanism configured to convert rotational motion of the rotational shaft into reciprocating motion and transmit the reciprocating motion to the output unit, and
the output unit receives a blade having an edge.

12. A power tool, comprising:
a body housing including
a first grip,
an inlet facing a front surface of the first grip,
a first outlet, and
a second outlet;

a brushless motor held on the body housing and including a rotational shaft;
an output unit supported on the body housing in a reciprocable manner;
a power transmission mechanism located between the brushless motor and the output unit in the body housing to transmit rotational motion of the rotational shaft to the output unit;
a controller held on the body housing to control the brushless motor; and
a fan held on the body housing and mounted on the rotational shaft, wherein
the body housing is configured to divide air drawn through the inlet and having cooled the brushless motor into a first outlet blow for cooling the power transmission mechanism and being discharged through the first outlet and a second outlet blow for cooling the controller and being discharged through the second outlet,
the first grip extends vertically,
the power tool further includes an upper joint connecting an upper end of the first grip with the body housing outside the brushless motor and the controller, and
a lower joint connecting a lower end of the first grip with the body housing outside the brushless motor and the controller, and

the second outlet is located in front of the lower joint.

13. The power tool according to claim 12 , wherein
the controller is located below the fan.

14. The power tool according to claim 12 , further comprising:
a battery mount on which a battery is mountable to power the brushless motor,
wherein the second outlet is located below and in front of the battery mount.

15. The power tool according to claim 12 , further comprising:
an outlet channel defined by a first wall surface of the controller and a second wall surface of the body housing, the outlet channel allowing the second outlet blow to pass through.

16. The power tool according to claim 15 , wherein
the controller includes a controller case,
the controller is inclined upward toward the front, and
the first wall surface is a bottom of the controller case.

17. A power tool, comprising:
a body housing including
a first grip,
an inlet facing a front surface of the first grip,
a first outlet, and
a second outlet;

a brushless motor held on the body housing and including a rotational shaft;
an output unit supported on the body housing in a reciprocable manner;
a power transmission mechanism located between the brushless motor and the output unit in the body housing to transmit rotational motion of the rotational shaft to the output unit;
a controller held on the body housing to control the brushless motor;
a fan held on the body housing and mounted on the rotational shaft; and
an outlet channel defined by a first wall surface of the controller and a second wall surface of the body housing, the outlet channel allowing the second outlet blow to pass through,
wherein the body housing is configured to divide air drawn through the inlet and having cooled the brushless motor into a first outlet blow for cooling the power transmission mechanism and being discharged through the first outlet and a second outlet blow for cooling the controller and being discharged through the second outlet.

18. The power tool according to claim 17 , wherein
the controller includes a controller case,
the controller is inclined upward toward the front, and
the first wall surface is a bottom of the controller case.

19. A power tool, comprising:
a body housing including
a first grip,
an inlet facing a front surface of the first grip,
a first outlet, and
a second outlet;

a brushless motor held on the body housing and including a rotational shaft;
an output unit supported on the body housing in a reciprocable manner;
a power transmission mechanism located between the brushless motor and the output unit in the body housing to transmit rotational motion of the rotational shaft to the output unit;
a controller held on the body housing to control the brushless motor; and
a fan held on the body housing and mounted on the rotational shaft, wherein
the body housing is configured to divide air drawn through the inlet and having cooled the brushless motor into a first outlet blow for cooling the power transmission mechanism and being discharged through the first outlet and a s

Assignees

• Makita Corp

Inventors

• Ogura Yasushi

Classifications

• B25F5/008 Primary

  Cooling means · CPC title

• B23D51/10

  for hand-held or hand-operated devices · CPC title

• H02K11/0094

  Structural association with other electrical or electronic devices · CPC title

• H02K5/20

  with channels or ducts for flow of cooling medium · CPC title

• B23D49/10

  Hand-held or hand-operated sawing devices with straight saw blades · CPC title