Power tool having an air cooling system andmethod for cooling components of a power tool

Patent metadata

Field	Value
Publication number	US-12365078-B2
Application number	US-202118039431-A
Country	US
Kind code	B2
Filing date	Nov 17, 2021
Priority date	Dec 4, 2020
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A power tool having an air cooling system. A special air guidance system is proposed, the components of the power tool, such as a motor, transmission or electronics of the power tool, can be supplied in a particularly efficient manner with a cooling air flow around them and in this way can be cooled. In this case, the cooling system should, in particular, be independent of any components of the housing of the power tool since the air guidance is advantageously brought about by internal guidance processes, wherein these internal guidance processes preferably take place independently of components of the housing of the power tool. In particular, the housing-independent air cooling of the components of the power tool is achieved by the provision of a fan on a rotor of the motor of the power tool, which is designed, by means of a reduced pressure, to produce a cooling air flow and guide it in a suitable manner through the power tool. In a second aspect, the invention relates to a method for cooling components of a power tool.

First claim

What is claimed is:

1. A power tool comprising:
an air cooling system including a fan;
a carrier unit with electronics;
a motor connector;
a motor having a stator and a rotor; and
a motor housing;
the fan being arranged on the rotor and configured to produce a reduced pressure so that an air flow produced by the reduced pressure cools the carrier unit, the motor connector, the motor having the stator and the rotor, and the motor housing of the power tool;
wherein the carrier unit has at least one interface for a rechargeable battery.

2. The power tool as recited in claim 1 wherein the air flow cools in sequence the carrier unit with electronics, the motor connector, the motor having the stator and the rotor, and the motor housing.

3. The power tool as recited in claim 1 wherein the electronics have at least one heat sink.

4. The power tool as recited in claim 3 wherein the electronics are installable in a suspended manner within the power tool.

5. The power tool as recited in claim 1 wherein the power tool has two rechargeable batteries as energy sources.

6. The power tool as recited in claim 1 further comprising a first, circumferential handle, and a second, upper handle and a protection frame for protecting a main body of the power tool.

7. The power tool as recited in claim 1 further comprising air inlets for sucking in air, the air inlets being arranged on a rear side of a main body of the power tool.

8. The power tool as recited in claim 7 wherein the air inlets are on opposite sides of an upper handle of the power tool.

9. The power tool as recited in claim 7 wherein the air inlets have domes to protect the air inlets from penetration of dirt or dust particles.

10. The power tool as recited in claim 1 further comprising a first air inlet arranged above a first rechargeable battery, and a second air inlet arranged above a second rechargeable battery.

11. The power tool as recited in claim 10 wherein the first and second air inlets are on opposite sides of an upper handle of the power tool.

12. The power tool as recited in claim 10 wherein the first and second air inlets have domes to protect the first and second air inlets from penetration of dirt or dust particles.

13. The power tool as recited in claim 1 further comprising an air outlet arranged in the region of a transmission of the power tool.

14. The power tool as recited in claim 1 wherein the rotor has an enclosure for protection from dust.

15. A method for cooling components of a power tool, the method comprising:
a) providing the power tool as recited in claim 1 ;
b) producing a reduced pressure via the fan, thereby causing an air flow within the power tool; and
c) cooling the carrier unit with electronics, the motor connector, the motor having the stator and the rotor, and the motor housing via the air flow produced in step b).

16. The method as recited in claim 15 wherein the cooling takes place in the sequence of the carrier unit with electronics, the motor connector, the motor having the stator and the rotor, and the motor housing.

17. A power tool comprising:
an air cooling system including a fan;
a carrier unit with electronics;
a motor connector;
a motor having a stator and a rotor; and
a motor housing;

the fan being arranged on the rotor and configured to produce a reduced pressure so that an air flow produced by the reduced pressure cools the carrier unit, the motor connector, the motor having the stator and the rotor, and the motor housing of the power tool;
wherein the power tool has two rechargeable batteries as energy sources.

18. A power tool comprising:
an air cooling system including a fan;
a carrier unit with electronics;
a motor connector;
a motor having a stator and a rotor;
a motor housing; and
a first, circumferential handle, and a second, upper handle and a protection frame for protecting a main body of the power tool;
the fan being arranged on the rotor and configured to produce a reduced pressure so that an air flow produced by the reduced pressure cools the carrier unit, the motor connector, the motor having the stator and the rotor, and the motor housing of the power tool.

19. A power tool comprising:
an air cooling system including a fan;
a carrier unit with electronics;
a motor connector;
a motor having a stator and a rotor;
a motor housing; and
a first air inlet arranged above a first rechargeable battery, and a second air inlet arranged above a second rechargeable battery;
the fan being arranged on the rotor and configured to produce a reduced pressure so that an air flow produced by the reduced pressure cools the carrier unit, the motor connector, the motor having the stator and the rotor, and the motor housing of the power tool.

20. The power tool as recited in claim 19 wherein the first and second air inlets are on opposite sides of an upper handle of the power tool.

21. The power tool as recited in claim 19 wherein the first and second air inlets have domes to protect the first and second air inlets from penetration of dirt or dust particles.

22. A power tool comprising:
an air cooling system including a fan;
a carrier unit with electronics;
a motor connector;
a motor having a stator and a rotor;
a motor housing; and
air inlets for sucking in air, the air inlets being arranged on a rear side of a main body of the power tool;
the fan being arranged on the rotor and configured to produce a reduced pressure so that an air flow produced by the reduced pressure cools the carrier unit, the motor connector, the motor having the stator and the rotor, and the motor housing of the power tool;
wherein the air inlets are on opposite sides of an upper handle of the power tool.

23. A power tool comprising:
an air cooling system including a fan;
a carrier unit with electronics;
a motor connector;
a motor having a stator and a rotor;
a motor housing; and
air inlets for sucking in air, the air inlets being arranged on a rear side of a main body of the power tool;
the fan being arranged on the rotor and configured to produce a reduced pressure so that an air flow produced by the reduced pressure cools the carrier unit, the motor connector, the motor having the stator and the rotor, and the motor housing of the power tool;
wherein the air inlets have domes to protect the air inlets from penetration of dirt or dust particles.

Assignees

• Hilti Ag

Inventors

• Greitmann Ralf
• Meuer Roland

Classifications

• B24B23/02 Primary

  with rotating grinding tools; Accessories therefor · CPC title

• B25F5/008 Primary

  Cooling means · CPC title