Hand power tool

• US 9,469,007 B2
• Filed: 02/18/2014
• Issued: 10/18/2016
• Est. Priority Date: 02/19/2013
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schuele, Manfred, Wanek, Helmut, Boeck, Cornelius, Schadow, Joachim, Maute, Joerg, Esenwein, Florian, Lutz, Manfred, Barth, Daniel
• Primary Examiner(s): Rose, Robert
• Application Number:
  US14/183,441
• Publication Number:
  US 20140235145A1
• Time in Patent Office: 973 Days
• Field of Search: 451/449, 451/358, 451/359, 451/7, 451/488, 451/53
• US Class Current: 1/1
• CPC Class Codes: B23Q 11/127 for cooling motors or spindles
• CPC Class Codes: B24B 23/02 with rotating grinding tools; Accessories therefor
• CPC Class Codes: B24B 23/028 Angle tools
• CPC Class Codes: B25F 5/008 Cooling means

Abstract

A hand power tool, in particular an angle grinder, includes a drive unit and an electronic unit. The hand power tool further includes an after-run cooling unit configured, at least partially, to cool the drive unit and/or the electronic unit substantially after an operating state of at least the drive unit.

Claims

1. A hand power tool, comprising:

a housing;

a drive unit in the housing configured to drive an output shaft to move;

an electronic unit in the housing configured to control the drive unit; and

an after-run cooling unit in the housing including a cooling element and a further drive unit, the cooling element being configured to be driven by the further drive unit to cool one or more of the drive unit and the electronic unit,

wherein the further drive unit is configured to receive power for driving the cooling element after the drive unit has been deactivated and movement of the output shaft has ceased.

2. The hand power tool according to claim 1, wherein the further drive unit that is configured to drive the after-run cooling unit to actively cool the one or more of the drive unit and the electronic unit after the drive unit has been deactivated and movement of the output shaft has ceased.

3. The hand power tool according to claim 1, further comprising a cooling unit separate from the after-run cooling unit and configured, at least partially, to cool one or more of the drive unit and the electronic unit when in an operating state.

4. The hand power tool according to claim 3, wherein the after-run cooling unit is configured so as to be at least partially integral with the cooling unit.

5. The hand power tool according to claim 1, further comprising at least one of an open-loop control unit and a closed-loop control unit configured, at least partially, for at least one of temperature-dependent and time-dependent control of the after-run cooling unit.

6. The hand power tool according to claim 1, wherein the after-run cooling unit has at least one fan element.

7. The hand power tool according to claim 1, wherein the after-run cooling unit comprises at least one air routing element.

8. The hand power tool according to claim 1, wherein the drive unit comprises at least one EC motor.

10. The hand power tool according to claim 1, wherein the hand power tool is configured as an angle grinder.

11. The hand power tool according to claim 1, wherein the after-run cooling unit is configured to cool the one or more of the drive unit and the electronic unit at least 15 seconds after the drive unit has been deactivated.

12. The hand power tool according to claim 11, wherein the after-run cooling unit is configured to cool the one or more of the drive unit and the electronic unit at least 30 seconds after the drive unit has been deactivated.

13. The hand power tool according to claim 12, wherein the after-run cooling unit is configured to cool the one or more of the drive unit and the electronic unit at least 45 seconds after the drive unit has been deactivated.

14. The hand power tool according to claim 13, wherein the after-run cooling unit is configured to cool the one or more of the drive unit and the electronic unit at least 60 seconds after the drive unit has been deactivated.

9. A method for cooling one or more of a drive unit and an electronic unit of a hand power tool, comprising:

supplying power to a further drive unit of an after-run cooling unit located in a housing of the hand power tool, the further drive unit being configured to drive a cooling element to cool one or more of the drive unit and the electronic unit, the power being supplied to the further drive unit after the drive unit has been deactivated and after an output shaft of the drive unit has ceased moving.