EP2490862A1 - Werkzeugmaschine und verfahren zur kühlung einer werkzeugmaschine - Google Patents
Werkzeugmaschine und verfahren zur kühlung einer werkzeugmaschineInfo
- Publication number
- EP2490862A1 EP2490862A1 EP10767978A EP10767978A EP2490862A1 EP 2490862 A1 EP2490862 A1 EP 2490862A1 EP 10767978 A EP10767978 A EP 10767978A EP 10767978 A EP10767978 A EP 10767978A EP 2490862 A1 EP2490862 A1 EP 2490862A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- machine tool
- tool according
- heat sink
- cooling
- 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- Withdrawn
Links
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 invention relates to a machine tool, in particular a hand tool according to the preamble of claim 1.
- the heat loss to the exterior surface of the percussion unit is largely dissipated to the environment by convection.
- An air mass flow required for convection is usually generated by a fan connected to the drive unit.
- a striking mechanism housing surrounding the impact mechanism is often surrounded by an additional plastic housing. But since the hottest part of this percussion gear housing is often at the end of the cold chain, there is only insufficient heat transfer to the outside at this point.
- the transmission unit comprises at least one heat sink.
- the heat sink can be advantageously achieved that occurring in the transmission unit waste heat can be delivered particularly effectively to a surrounding air mass flow.
- gear unit comprises an at least rotatable shaft which is at least partially surrounded by the heat sink. It may be of particular advantage when the rotatable shaft is mounted in the heat sink.
- the heat sink encloses the at least rotatable shaft substantially coaxially.
- the heat sink is at least substantially non-rotatably connected, preferably non-rotatably connected to the at least rotatable shaft, then a heat transfer can proceed even more effectively.
- the heat sink is designed as a centrifugal disk.
- the transmission element designed as a heat sink has at least one subregion provided with cooling fins.
- the heat sink has at least one heat-absorbing connection region.
- a heat-accepting connection region is understood in particular to be a region on the heat sink, at which it is in contact, preferably in direct contact, with a heat-emitting body, so that the lowest possible heat transfer resistance is produced.
- a direct contact can be made, for example, by positive and / or positive and / or cohesive connection.
- the contact is formed as a press fit.
- a heat-conducting substance such as a thermal paste can be advantageously used.
- the gear unit are arranged in a gear housing, which is accommodated in the housing.
- the gear housing is made of a metallic material, in particular steel.
- the gear housing has at least on one surface at least one gas-permeable surface structure in a surface direction.
- a surface direction is understood to mean, in particular, an extension direction of the surface.
- a gas-permeable surface structure is to be understood as meaning, in particular, a structure which opposes, to a gas flowing in the structure, the lowest possible, preferably almost vanishing, resistance.
- the inflowing gas may preferably be air.
- the surface structure may be formed as at least one overflow groove.
- At least one air inlet opening is provided, via which a cooling air flow for the removal of at least a portion of the waste heat can flow into the housing.
- at least one air outlet opening is provided in a transition region between the tool holder and the housing, via which at least a fraction of the cooling air flow can exit.
- the at least rotatable shaft is an at least rotatable working spindle, in particular a hammer tube.
- the machine tool according to the invention is a hand tool, in particular a drill and / or chisel hammer.
- the invention relates to a method for cooling a machine tool, in particular a hand tool, which has a drive device accommodated in a housing, having a drive unit and a gear unit.
- Figure 1 is a schematic side view of a drilling and / or
- FIG. 1 is a partial section of a front portion of the hammer drill
- FIG. 1 shows a schematic view of a drill and / or chisel hammer 10 as an example of a machine tool with a housing 12, a tool holder 14 movably mounted on the housing 12 for receiving an insertion tool 16 and a drive unit 18 and accommodated in the housing 12 a transmission unit 20 having drive device 22 for driving the insert tool 16.
- the tool holder 14 is preferably rotatably arranged on an end face 24 of the housing 12.
- a handle device 26 is further provided in the example of Figure 1 further.
- the handle device 26 comprises a main device switch 28 for commissioning the drill and / or chisel hammer 10.
- an auxiliary handle device 30 is arranged, in particular adjustably, on the housing 12 of the drill and / or chisel hammer 10.
- the housing 12 of the rotary and / or chisel hammer 10 furthermore has at least one, preferably two or more ventilation openings 32.
- the ventilation opening 32 acts either as an air inlet opening 38 or as an air outlet opening 40. At least, however, an air inlet opening 38 is provided on the housing 12.
- an additional air outlet opening 46 is provided in an intermediate region 42 between the housing 12 and the tool holder 14, in particular between the housing 12 and a jacket sleeve 44 of the tool holder 14, an additional air outlet opening 46 is provided.
- the drive unit 18 comprises in the present example a motor 48, in particular an electric motor 50 and a motor shaft, not shown here.
- the motor 48, 50 is operatively connected to the gear unit 20 via the motor shaft.
- the gear unit 20 of the drilling and / or chiselling hammer 10 described here has, in a known form, a rotary drive gear and / or a hammer mechanism with a percussion drive gear.
- the hammer mechanism is often designed as a so-called air cushion or air spring impact mechanism.
- airbag impact devices in many ways contribute to a waste heat of the drive device 22 of the drill and / or chisel hammer 10.
- FIG. 2 shows a front section of the drill and / or chisel hammer 10 in a partial section.
- the tool holder 14 has, in addition to the jacket sleeve 44, a tool holder 52, which is preferably made of a metallic material, in particular a steel, and a locking device 56 comprising at least one locking element 54.
- a spigot 58 of the insert tool 16 is received and locked via the locking device 56.
- the gear unit 20 of the rotary and / or chisel hammer 10 has a work spindle 60, preferably a hammer tube 61 as an example of a rotatable shaft 59.
- the tool holder 52 is here exemplarily inserted into an open end 62 of the work spindle 60, 61 and preferably rotatably and axially immovably connected to the work spindle 60, 61.
- the tool holder 52 is connected to the work spindle 60, 61 by means of the locking body 64 engaging in the tool holder 52 and passing through the work spindle 60, 61.
- the work spindle 60, 61 is received via a sliding bearing 66 in a transmission housing 68 and rotatably supported relative thereto.
- the gear housing 68 is delimited outwardly from the housing 12, in particular a hammer tube hood 70 and at least partially enclosed.
- the gear housing 68 is made in particular of a metallic material, preferably of a steel.
- the hammer tube hood 70 like the housing 12, is preferably made of a plastic.
- a felt ring 72 and a radial shaft seal 74 are further arranged, via which the gear housing 68 is sealed against dust entering.
- a striker 76 is further provided in a transition region between the tool holder 52 and the work spindle 60, 61 .
- the firing pin 76 has one or more earrings 78, via which a Interior 80 of the work spindle 60, 61 is sealed against penetrating dust.
- the gear housing 68 has at least one Kochströmnut 82.
- the overflow groove 82 extends along a surface direction 71 along a surface 69 of the gear housing 68.
- a surface direction is understood to mean in particular a direction which runs parallel to the surface 69 and, in particular, follows the surface profile in a spatial direction in a local coordinate system of the surface 69.
- the Studentsströmnut 82 is located in a support region of the gear housing 68 relative to the hammer tube cover 70 and the housing 12 of the hammer drill 10.
- the Kochströmnut 82 has the task to flow an air mass flow 84 in the direction of the tool holder 14.
- the Processstömnuten shown here 82 are also known other gas-permeable surface structures 83 known in the art, which can be used according to the invention to produce a convective cooling of the impact mechanism. For example, you can
- a heat sink 88 is arranged radially on the outside of the work spindle 60, 61, preferably non-rotatably connected to the work spindle 60, 61.
- a heat sink 88 is understood in particular to be an element which has a large heat conduction and / or heat transfer surface and / or convection surface and / or a low heat transfer resistance.
- the heat sink 88 is designed in the embodiment of Figure 2 as a mainly sleeve-like component.
- the heat sink 88 preferably extends positively and / or non-positively via the connection region 86.
- the heat sink 88 is therefore in particular non-rotatably connected to the work spindle 60, 61.
- the person skilled in the art is familiar with further connection techniques which can be used alternatively or additionally according to the invention.
- a cohesive connection can be used by soldering or welding as an alternative or complementary connection technology.
- a heat-conducting material in particular a thermal compound, the heat transfer from the work spindle 60, 61 may be introduced to the heat sink 88 favoring.
- the heat sink 88 further has a sealing labyrinth 90 formed in common with the gearbox housing 68.
- the sealing labyrinth 90 serves for improved dust sealing of the gear housing 68 against penetrating, dust-containing air, for example, from the air mass flow 84.
- the heat sink 88 preferably has one or more preferably a plurality of cooling fins 92 projecting into the air mass flow 84.
- the air mass flow 84 thus flows over the overflow grooves 82 and the cooling ribs 92. Thereafter, the air mass flow 84 exits via the additional air outlet opening 46 provided in the transition region 42 into the environment.
- a waste heat generated in particular in the front region of the hammer drill 10 can thus be discharged efficiently via the cooling ribs 92 of the heat sink 88 to the air mass flow 84.
- the heat sink 88 may also have additional features over which additional functions can be displayed.
- a Abdichtlabyrinth 94 may be provided, via which an inner space 96 of the tool holder 14 is protected from penetrating dust.
- the heat sink 88 can also be used as a carrier for sealing elements 98.
- the cooling body 88 is arranged coaxially around the working spindle 60, 61 and is designed in particular as a centrifugal disk 100. This has the advantage that by a rotary movement of the work spindle 60, 61, the sealing effect and the cooling effect of the heat sink 88, 100 are still reinforced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910045799 DE102009045799A1 (de) | 2009-10-19 | 2009-10-19 | Werkzeugmaschine und Verfahren zur Kühlung einer Werkzeugmaschine |
PCT/EP2010/064882 WO2011047959A1 (de) | 2009-10-19 | 2010-10-06 | Werkzeugmaschine und verfahren zur kühlung einer werkzeugmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2490862A1 true EP2490862A1 (de) | 2012-08-29 |
Family
ID=43371529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10767978A Withdrawn EP2490862A1 (de) | 2009-10-19 | 2010-10-06 | Werkzeugmaschine und verfahren zur kühlung einer werkzeugmaschine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2490862A1 (de) |
CN (1) | CN102596512B (de) |
DE (1) | DE102009045799A1 (de) |
WO (1) | WO2011047959A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013204985A1 (de) * | 2013-03-21 | 2014-10-09 | Robert Bosch Gmbh | Handwerkzeugmaschine |
JP6258093B2 (ja) * | 2014-03-24 | 2018-01-10 | 株式会社マキタ | 打撃工具 |
EP3251803B1 (de) * | 2015-01-30 | 2022-10-26 | Koki Holdings Co., Ltd. | Arbeitsmaschine |
DE102017211007A1 (de) * | 2017-06-29 | 2019-01-03 | Robert Bosch Gmbh | Handwerkzeugmaschine |
EP3987569A4 (de) | 2019-06-24 | 2023-06-28 | Milwaukee Electric Tool Corporation | Elektrowerkzeuge mit wärmesenken mit hohem emissionsvermögen |
EP3763467A1 (de) * | 2019-07-11 | 2021-01-13 | Hilti Aktiengesellschaft | Staubschutzkappe mit schwingungsentkopplung |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19626254A1 (de) * | 1996-06-29 | 1998-01-08 | Bosch Gmbh Robert | Elektrohandwerkzeugmaschine |
DE19913833A1 (de) * | 1998-03-27 | 1999-10-07 | Bender Gmbh & Co Kg Dr | Antriebssystem zur Übertragung rotierender Bewegungen |
EP1302281B1 (de) * | 2001-10-15 | 2007-05-02 | HILTI Aktiengesellschaft | Kühlluftleitung für ein Elektrohandwerkzeuggerät mit elektropneumatischem Schlagwerk |
DE102004036585A1 (de) * | 2004-07-28 | 2006-03-23 | Robert Bosch Gmbh | Zwischenflansch für eine Werkzeugmaschine |
DE102004055268A1 (de) * | 2004-11-17 | 2006-05-18 | Robert Bosch Gmbh | Handwerkzeugmaschine |
DE102004058696A1 (de) | 2004-12-06 | 2006-06-08 | Hilti Ag | Elektrowerkzeuggerät |
GB0428210D0 (en) * | 2004-12-23 | 2005-01-26 | Black & Decker Inc | Mode change mechanism |
EP1674213B1 (de) * | 2004-12-23 | 2008-10-01 | BLACK & DECKER INC. | Kraftwerkzeug mit Kühlvorrichtung |
DE102006031513A1 (de) * | 2006-07-07 | 2008-01-17 | Robert Bosch Gmbh | Handwerkzeugmaschine, insbesondere Handsäge |
DE102007012395A1 (de) * | 2007-03-15 | 2008-09-18 | Festool Gmbh | Hand-Werkzeugmaschine mit einem Kühlkörper |
-
2009
- 2009-10-19 DE DE200910045799 patent/DE102009045799A1/de not_active Withdrawn
-
2010
- 2010-10-06 WO PCT/EP2010/064882 patent/WO2011047959A1/de active Application Filing
- 2010-10-06 EP EP10767978A patent/EP2490862A1/de not_active Withdrawn
- 2010-10-06 CN CN201080047276.5A patent/CN102596512B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2011047959A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102596512A (zh) | 2012-07-18 |
WO2011047959A1 (de) | 2011-04-28 |
DE102009045799A1 (de) | 2011-05-12 |
CN102596512B (zh) | 2015-08-19 |
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