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EP2191940A1 - Outil électrique - Google Patents

Outil électrique Download PDF

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Publication number
EP2191940A1
EP2191940A1 EP09174829A EP09174829A EP2191940A1 EP 2191940 A1 EP2191940 A1 EP 2191940A1 EP 09174829 A EP09174829 A EP 09174829A EP 09174829 A EP09174829 A EP 09174829A EP 2191940 A1 EP2191940 A1 EP 2191940A1
Authority
EP
European Patent Office
Prior art keywords
air
power tool
fan wheel
guide ring
air outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09174829A
Other languages
German (de)
English (en)
Inventor
Axel Hartmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Techtronic Industries GmbH
Original Assignee
AEG Electric Tools GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AEG Electric Tools GmbH filed Critical AEG Electric Tools GmbH
Publication of EP2191940A1 publication Critical patent/EP2191940A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means

Definitions

  • the present invention relates to a power tool, in particular a hand-operated power tool, such. Eg a drill or a hammer drill.
  • Such a power tool usually has an electric motor.
  • a drive shaft of the electric motor can be rotatably connected to a fan.
  • a housing which accommodates the electric motor and the fan, at least one air inlet opening and at least one air outlet opening are provided.
  • the fan wheel can now generate a cooling air flow which leads from the respective air inlet opening through the housing to the respective air outlet opening.
  • other heat-critical components of the power tool can be acted upon with cooling air, such.
  • a gear that the speed of the drive shaft z For example, translated or reduced to a speed of a working spindle of the power tool.
  • the present invention is concerned with the problem of providing an improved embodiment for a power tool of the type mentioned, which is characterized in particular by the fact that improved cooling can be realized.
  • the invention is based on the general idea to arrange in the housing an air guide ring, which guides the cooling air from the fan to at least one air outlet opening, which is spaced in the direction of the axis of rotation of the drive shaft from the fan.
  • the at least one air duct of the air guide ring allows a discharge of the cooling air against a comparatively low flow resistance.
  • the at least one air duct can be advantageously shaped, in particular optimized, aerodynamically.
  • the promoted cooling air flow can be increased, which improves the cooling performance.
  • the use of the air guide ring allows the positioning of at least one air outlet axially spaced from the fan as the at least one air duct can guide the flow of air at low flow resistance from the fan to at least one air outlet. Accordingly, there are new freedoms and possibilities for the design of the housing and the power tool, since it is no longer necessary to arrange the at least one air outlet axially at the same height as the fan to realize a low flow resistance at sufficient flow.
  • the air guide ring simplifies the construction of the power tool. In particular, a particularly compact construction can be realized, since the at least one air outlet opening and the fan wheel can be arranged axially spaced from each other.
  • a plurality of air outlet openings may be provided in the housing, which may in particular be positioned axially offset relative to one another on the housing.
  • the air guide ring can now have a plurality of air ducts leading to different air outlet openings, in particular also to the axially offset air outlet openings.
  • This measure likewise leads to an improvement in the cooling, since a plurality of differently positioned air outlet openings can be reached via the air ducts, wherein at the same time a low flow resistance can be achieved. Since several differently positioned air outlet openings can be reached with the aid of the air ducts of the air guide ring, additional possibilities for positioning such air outlet openings on the housing result. The freedom in the construction of the power tool is thereby increased.
  • the realization of a sufficient cooling air flow in the power tool is simplified. Since more different air outlet openings can be reached via the specifically designed air ducts, in particular the total available outlet cross-section can be increased, which can also contribute to reducing the exhaust air-side flow resistance.
  • the guided air flow can also be used to cool parts of a transmission of the power tool. This air flow can be performed so far in the axial direction that a portion of the air flow is passed through the entire transmission and only at a front end of the power tool, for example in the vicinity of a tool or Bohrera again from the device or from the Housing exits.
  • the respective air duct can one the fan wheel facing tangential inlet region and the respective air outlet opening associated radial outlet region.
  • an outer contour of the air guide ring is configured complementary to an inner contour of the housing in the region of the air guide ring and the fan.
  • a shape-integrated arrangement of the air guide ring can be realized in the housing. This simplifies the installation and the position-fixed positioning of the air guide ring in the housing. Furthermore, thereby the available space can be optimally used.
  • the air guide ring enclosing a Lüfterradraum coaxial, in which the fan is arranged. With this Lüfterradraum the respective air duct or the air ducts are connected communicating on the inlet side.
  • the Lüfterradraum can be geometrically adapted to the radial outer contour of the fan.
  • the Lüfterradraum has a plurality of cylinder wall sections which form a relatively small radial gap between itself and the fan.
  • the cooling air is largely or completely removed by the arranged in the circumferential direction between the cylinder wall sections air ducts, while only a small proportion of the air is conveyed through the annular gap in the circumferential direction.
  • the air guide ring may have an annular bottom which encloses a communicating with the Lüfterradraum central inlet and which overlaps the fan wheel in the radial direction at least partially. With the help of this annular bottom is achieved that supply air, which flows through the central inlet in the Lüfterradraum or enters the fan, can no longer get to the supply air side when it has been promoted via the fan to the outside in the area of the soil.
  • the floor obstructs or prevents a return flow and thereby improves the delivery of the fan.
  • a lid may be provided which limits the Lüfterradraum axially on a side facing away from the ground. With the help of this cover, through which in particular the drive shaft can be passed, now false air flows that leave the fan or the Lüfterradraum in the axial direction, can be hindered or prevented, which improves the radial flow of the fan and thus the removal of the cooling air improved by the at least one air duct. This also ultimately leads to an increase in the funded cooling air flow.
  • a power tool 1 comprises a housing 2, in which an electric motor 3 and a fan 4 are arranged.
  • This is preferably a hand-operated power tool, to which its housing 2 is equipped with a handle 5.
  • the power tool 1 is designed as a hammer drill. It is also possible to design the power tool as a drill or as a saw or as a grinding machine or as a milling tool or the like.
  • the housing 2 has at least one air inlet opening 6, through which air from an environment of the power tool can enter into the interior of the housing 2.
  • air inlet openings 6 In the example are at the in Fig. 1 the viewer facing side three slot-shaped air inlet openings 6 are shown. It is clear that such air inlet openings 6 can also be present on the side facing away from the observer. In addition, the air inlet openings 6 may differ in positioning and / or number from the illustration shown.
  • the housing 2 has at least one air outlet opening 7. In the example, a plurality of air outlet openings 7 are shown, namely three slot-shaped air outlet openings 7a, 7b, 7c, which in Fig. 1 are arranged on a side facing the viewer of the housing 2.
  • corresponding air outlet openings 7a, 7b and 7c may also be present on the side facing away from the viewer.
  • the air outlet openings 7 may differ in terms of positioning and / or number of the representation shown.
  • a fourth air outlet opening 7d is provided, which corresponds to the Fig. 1 to 3 is positioned on an underside of the housing 2. It is noteworthy that the air outlet openings 7 and the air inlet openings 6 are arranged on different sides with respect to the electric motor 3 and with respect to the fan wheel 4.
  • the air inlet openings 6 are positioned upstream of the electric motor 3, while the air outlet openings 7 are arranged downstream of the electric motor 3.
  • the fan 4 is rotatably connected to a drive shaft 8 of the electric motor 3.
  • the fan 4 rotates inevitably with the drive shaft 8 with.
  • the fan 4 drives the air, that is, the fan 4 sucks air from the environment via the air inlet openings 6 and drives them out of the housing 2 through the air outlet openings 7.
  • the desired cooling air flow which can be used for cooling the electric motor 3 and in particular other components of the power tool 1.
  • a transmission which is not described here in detail, and a bearing, likewise unspecified here, of the drive shaft 8 can be cooled.
  • an unspecified electronics of the power tool 1 can be actively cooled.
  • the first air outlet opening 7a is positioned with respect to an axial direction 9, which is defined by a rotation axis 10 of the drive shaft 8 and parallel to this axis of rotation 10, approximately at the same height as the fan 4. All other air outlet openings 7 are in the axial direction 9 of the fan 4 spaced apart.
  • the second air outlet opening 7b is spaced in the axial direction of the first air outlet opening 7a, whereby an axial distance to the fan 4 is formed.
  • the largest axial distance from the fan 4 has in the example shown the fourth air outlet 7d.
  • air outlet openings 7 may be present.
  • a further air outlet opening 7, not shown here, can be arranged in the region of an end remote from the handle 5, in particular in the vicinity of a tool holder 23, for example to allow a complete flow through the aforementioned transmission with a part of the cooling air flow.
  • an air guide ring 11 is arranged.
  • the air guide ring 11 encloses the fan 4 coaxially and has at least one air duct 12.
  • a plurality of air ducts 12 are formed on the air guide ring 11, namely a first air duct 12a for each first air outlet 7a, at least a second and third air duct 12b and 12c for the second and third air outlets 7b and 7c and a fourth air duct 12d for the fourth air outlet 7d ,
  • the second air duct 12b and the third air duct 12c together or unite, so that they as the common air duct 12b, c to the second and third air outlet opening 7b, c lead the respective tool side.
  • at least one air duct 12, namely the first two air ducts 12a, provided, which leads to at least one air outlet 7, namely to the first two air outlet openings 7a, which is arranged in the axial direction 9 in the region of the fan 4 are.
  • the air guide ring 11 in the example shown comprises a plurality of air ducts 12, which lead to axially offset from each other air outlet openings 7.
  • the four axially offset air outlet openings 7a, b, c, d shown in the example are assigned at least three or four air ducts 12 which lead to these axially offset air outlet openings 7.
  • Fig. 3 and 4 has the respective air duct 12 radially inward on a fan wheel 4 side facing a non-descript tangential inlet area and radially outside, one of the respective air outlet opening 7 facing, unspecified radially oriented exit area.
  • the air guide ring 11 according to the preferred embodiment shown here on an unspecified outer contour, which is complementary to the inner contour of the housing 2 in the region of the fan 4 and in the region of the air guide ring 11 is configured.
  • the air guide ring 4 can be integrated into the housing 2 with an extremely small space requirement.
  • the air guide ring 11 encloses according to the Fig. 2 to 9 a Lüfterradraum 13 coaxial. In this Lüfterradraum 13, the fan 4 is arranged. Furthermore, the air ducts 12 communicate on the inlet side with this fan wheel space 13.
  • the air guide ring 11 has a plurality of wall sections 14 for radially delimiting the fan wheel space 13, each delimiting a circumferential segment of the fan wheel space 13.
  • the wall sections 14 can be designed in the form of a cylinder segment or at least have a section with a cylindrical segment-shaped inner side. Between this wall sections 14 and the fan 4 can be correspondingly Fig. 3 form a comparatively narrow radial gap 15, whereby an air flow in the circumferential direction is hindered. Between adjacent wall sections 14 are the inlet regions of the different air ducts 12.
  • the air guide ring 11 also has an annular bottom 16, which is oriented coaxially to the axis of rotation 10 and the one central inlet 17th encloses the air guide ring 11. Furthermore, the bottom 16 in the radial direction overlaps the fan 4 at least partially, which Fig. 2 is removable.
  • the central inlet 17 is communicatively connected to the Lüfterradraum 13. It faces the axial suction side of the fan wheel 4, while the wall sections 14 face the radial pressure side of the fan wheel 4. Through the inlet 17, the intake of air from the housing 2 and thus via the internal cooling air path, the intake of air from the environment through the air inlet openings 6.
  • the bottom 16 prevents or hinders a backflow from the pressure side of the fan 4 to the suction side.
  • a cover 18 is provided which limits the Lüfterradraum 13 axially on the side facing away from the bottom 16 side.
  • Said lid 18 is expediently a respect to the air guide ring 11 separately manufactured component. He has a unspecified here central opening through which the drive shaft 8 is guided.
  • the cover 18 ensures that the air driven by the fan 4 air flows from the pressure side via the air ducts 12 and does not first penetrate into the housing 2 in the axial direction. Thus, the cover 18 contributes to the targeted air flow through the air ducts 12 and also ensures a reduced downstream air resistance.
  • the cover 18 is located on frontally arranged contact surfaces 19 of the air guide ring 11 axially.
  • These contact surfaces 19 are formed at frontal free ends of the wall sections 14.
  • the wall sections 14 bound radially inside the Lüfterradraum 13. Furthermore, they may be extended into the air ducts 12, so that they inside and / or outside at least one of the air ducts 12 laterally limit.
  • the air guide ring 11 also has an annular collar 20 which protrudes axially on a side facing away from the fan 4 and the corresponding Fig. 2 the electric motor 3 partially overlapped in the axial direction. This causes a channeling or alignment of the cooling air path to the central inlet 17.
  • the axis of rotation 10 of the electric motor 3 is oriented parallel to a rotation axis 21 of a tool spindle 22 of the power tool 1. Basically, an angled design is possible.
  • the axial distance of the air outlet openings 7 spaced from the fan wheel 4 is, for example, once to four times or at least four times greater than an axial height of the fan wheel 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Motor Or Generator Cooling System (AREA)
EP09174829A 2008-11-28 2009-11-03 Outil électrique Withdrawn EP2191940A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008059599A DE102008059599A1 (de) 2008-11-28 2008-11-28 Elektrowerkzeug

Publications (1)

Publication Number Publication Date
EP2191940A1 true EP2191940A1 (fr) 2010-06-02

Family

ID=41404275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09174829A Withdrawn EP2191940A1 (fr) 2008-11-28 2009-11-03 Outil électrique

Country Status (4)

Country Link
US (1) US8479840B2 (fr)
EP (1) EP2191940A1 (fr)
CN (1) CN101745898A (fr)
DE (1) DE102008059599A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2465647A3 (fr) * 2010-12-20 2013-01-16 HILTI Aktiengesellschaft Machine-outil manuelle dotée d'un élément de conduite d'air
US10807226B2 (en) 2014-07-23 2020-10-20 Black & Decker Inc. Range of power tools

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001258A1 (de) * 2008-04-18 2009-10-22 Robert Bosch Gmbh Werkzeugmaschine mit elektrischem Antriebsmotor
JP5725354B2 (ja) * 2011-08-19 2015-05-27 日立工機株式会社 電動工具
US20130299207A1 (en) * 2012-05-10 2013-11-14 Black & Decker, Inc. Power tool cooling
TW201534442A (zh) * 2014-03-12 2015-09-16 bo-hong Chen 電動手工具散熱結構
US9475172B2 (en) 2014-07-15 2016-10-25 Milwaukee Electric Tool Corporation Adjustable guard for power tool
GB201610953D0 (en) * 2016-06-23 2016-08-10 Black & Decker Inc Motor end cap
US10759080B2 (en) 2017-01-22 2020-09-01 Nanjing Chervon Industry Co., Ltd. Electric tool
EP3638456B1 (fr) * 2017-05-12 2021-03-31 Petrovic, Janez Dispositif de dépoussiérage pour le dépoussiérage de l'air de refroidissement d'outils électriques
CN107396697B (zh) * 2017-08-23 2023-08-29 浙江动一新能源动力科技股份有限公司 一种打草机
DE202018104460U1 (de) * 2017-09-29 2018-08-16 Nanjing Chervon Industry Co., Ltd. Elektrohandwerkzeug
CN115570179A (zh) * 2021-07-06 2023-01-06 南京泉峰科技有限公司 电钻及电动工具

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Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH345262A (de) 1958-05-09 1960-03-15 Duss Friedrich Fa Elektrohandschleifer
US3818255A (en) * 1973-07-30 1974-06-18 Singer Co Bearing assembly for power tools having a plastic housing
US5315193A (en) * 1990-02-02 1994-05-24 Robert Bosch Gmbh Hand-guided machine tool comprising a radial blower
WO1997009157A1 (fr) 1995-09-06 1997-03-13 Ryobi North America, Inc. Stator d'echappement pour un outil electrique
EP0794038A2 (fr) * 1996-01-08 1997-09-10 Kress-elektrik GmbH + Co. Elektromotorenfabrik Outil à main avec un arrangement de refroidissement
EP0873824A2 (fr) * 1997-04-23 1998-10-28 Matsushita Electric Works, Ltd. Outil manuel à moteur
US6043575A (en) * 1999-03-05 2000-03-28 Snap-On Tools Company Power tool with air deflector for venting motor exhaust air
WO2003066262A2 (fr) 2002-02-04 2003-08-14 Milwaukee Electric Tool Corporation Dispositifs electriques comprenant un moteur a reluctance commute
EP1541293A1 (fr) * 2003-12-11 2005-06-15 HILTI Aktiengesellschaft Outil à main
DE102004029220A1 (de) 2004-06-16 2006-01-12 Hilti Ag Handwerkzeuggerät mit Staubabsaugmodul
DE102004045625A1 (de) 2004-09-21 2006-04-06 Robert Bosch Gmbh Staubabsaugvorrichtung für eine Handwerkzeugmaschine
EP1970162A1 (fr) * 2007-03-15 2008-09-17 Festool GmbH Machine-outil manuelle dotée d'un corps de refroidissement
DE102007017243A1 (de) * 2007-04-12 2008-10-16 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2465647A3 (fr) * 2010-12-20 2013-01-16 HILTI Aktiengesellschaft Machine-outil manuelle dotée d'un élément de conduite d'air
US10807226B2 (en) 2014-07-23 2020-10-20 Black & Decker Inc. Range of power tools

Also Published As

Publication number Publication date
CN101745898A (zh) 2010-06-23
US20100132968A1 (en) 2010-06-03
DE102008059599A1 (de) 2010-06-02
US8479840B2 (en) 2013-07-09

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