Housing for an electric machine tool

Patent metadata

Field	Value
Publication number	US-11465266-B2
Application number	US-201916720880-A
Country	US
Kind code	B2
Filing date	Dec 19, 2019
Priority date	Dec 19, 2018
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A housing for an electric machine tool, in particular for a core drill, said housing in which a motor is accommodated, which has a motor shaft for driving a tool mount and to which cooling air is supplied through at least one air guide duct, which is delimited at one end by at least one air inlet and at the other end by at least one air outlet. A guide structure, providing air guidance for the cooling air and associated with a motor mount, in which the motor is at least partially accommodated, is disposed in the air guide duct downstream from the at least one air inlet.

First claim

What is claimed is:

1. A housing for an electronic machine tool, the housing accommodating a motor that has a motor shaft for driving a tool mount, the housing comprising:
at least one air duct to supply cooling air to the motor;
at least one air inlet delimiting the at least one air duct at a first end;
at least one air outlet delimiting the at least one air duct at a second end; and
a guide structure to provide air guidance for the cooling air and having a motor mount on which the motor is at least partially accommodated, the guide structure being disposed in the air guide duct downstream from the at least one air inlet,
wherein the motor mount is disposed on a side of the guide structure that faces away from the tool mount.

2. The housing according to claim 1 , wherein the motor mount is disposed in an area of a commutator of the motor.

3. The housing according to claim 1 , wherein the guide structure comprises a plate-shaped base body and wherein the motor mount extends substantially perpendicular to the base body.

4. The housing according to claim 3 , wherein the base body is axially spaced from the at least one air inlet in a flow direction.

5. The housing according to claim 1 , wherein at least one plug-in recess is formed in the housing for detachably receiving the guide structure.

6. The housing according to claim 1 , wherein the housing is formed of multiple parts and comprises a first housing part and a second housing part, which are detachably connectable to one another by a plug connection.

7. The housing according to claim 1 , wherein the guide structure is formed of multiple parts.

8. The housing according to claim 1 , wherein passages are formed in the guide structure.

9. The housing according to claim 8 , wherein the passages are covered at least partially by covers.

10. The housing according to claim 1 , wherein an outer contour of the guide structure is adapted to an inner contour of the housing.

11. A housing for an electronic machine tool, the housing accommodating a motor that has a motor shaft for driving a tool mount, the housing comprising:
at least one air duct to supply cooling air to the motor;
at least one air inlet delimiting the at least one air duct at a first end;
at least one air outlet delimiting the at least one air duct at a second end; and
a guide structure to provide air guidance for the cooling air and having a motor mount on which the motor is at least partially accommodated, the guide structure being disposed in the air guide duct downstream from the at least one air inlet,
wherein a gap, which has a width which lies between 10% and 30% or between 15% and 20% of a diameter of the motor shaft, is formed between the motor mount and a part of the motor that is surrounded by the motor mount.

12. The housing according to claim 11 , wherein the gap has an annular shape at least in sections.

13. A housing for an electronic machine tool, the housing accommodating a motor that has a motor shaft for driving a tool mount, the housing comprising:
at least one air duct to supply cooling air to the motor;
at least one air inlet delimiting the at least one air duct at a first end;
at least one air outlet delimiting the at least one air duct at a second end; and
a guide structure to provide air guidance for the cooling air and having a motor mount on which the motor is at least partially accommodated, the guide structure being disposed in the air guide duct downstream from the at least one air inlet,
wherein a guide insert is provided whose longitudinal axis is oriented substantially parallel to the motor shaft of the motor.

14. The housing according to claim 13 , wherein the guide insert is disposed directly adjacent to the motor.

Assignees

• Fein C & E Gmbh

Inventors

• Shondel Aryon
• Hess Achim
• Gosnik Ralf
• Richt Boris
• Denzel Sergej

Classifications

• B23B45/001

  Housing of the drill, e.g. handgrip · CPC title

• B23B2250/12

  Cooling and lubrication · CPC title

• B25F5/008 Primary

  Cooling means · CPC title

• H02K9/02

  by ambient air flowing through the machine · CPC title

• B23B51/06

  Drills with lubricating or cooling equipment {(B23B51/042 takes precedence)} · CPC title