EP2523780A1 - Marteau perforateur et/ou percuteur avec refroidissement des composants de l'appareil - Google Patents

Marteau perforateur et/ou percuteur avec refroidissement des composants de l'appareil

Info

Publication number
EP2523780A1
EP2523780A1 EP11700320A EP11700320A EP2523780A1 EP 2523780 A1 EP2523780 A1 EP 2523780A1 EP 11700320 A EP11700320 A EP 11700320A EP 11700320 A EP11700320 A EP 11700320A EP 2523780 A1 EP2523780 A1 EP 2523780A1
Authority
EP
European Patent Office
Prior art keywords
cooling air
flow
air flow
cooling
cylinder
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.)
Granted
Application number
EP11700320A
Other languages
German (de)
English (en)
Other versions
EP2523780B1 (fr
Inventor
Michael Fischer
Otto W. Stenzel
Wolfgang Hausler
Rudolf Berger
Christian Littek
Helmut Braun
Manfred Zinsmeister
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.)
Wacker Neuson Produktion GmbH and Co KG
Original Assignee
Wacker Neuson Produktion GmbH and Co KG
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 Wacker Neuson Produktion GmbH and Co KG filed Critical Wacker Neuson Produktion GmbH and Co KG
Publication of EP2523780A1 publication Critical patent/EP2523780A1/fr
Application granted granted Critical
Publication of EP2523780B1 publication Critical patent/EP2523780B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/20—Devices for cleaning or cooling tool or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/06—Means for driving the impulse member
    • B25D9/10—Means for driving the impulse member comprising a built-in internal-combustion engine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
    • B25D2217/0061—Details related to cleaning or cooling the tool or workpiece related to cooling

Definitions

  • the invention relates to a drilling and / or percussion hammer with an internal combustion engine.
  • Drilling and / or impact hammers with internal combustion engine - hereinafter also referred to as a hammer for short - are known in particular as relatively heavy hammers, with which is operated substantially vertically downwards.
  • a driven via the crankshaft of the engine cooling air blower for cooling the engine is provided.
  • the cooling air blower generates a cooling air flow, which is guided on the outside of the cylinder of the internal combustion engine, in particular on the provided on the outside of the cylinder cooling fins along.
  • the engine cooling air discharged from the engine is usually very hot and therefore has to be taken away from the hammer by the shortest possible route.
  • the invention has for its object to provide a drilling and / or percussion hammer, in which an improved cooling of the components is possible.
  • a hammer drill has an internal combustion engine with a cylinder and a piston movable in the cylinder, a cooling air blower for generating a cooling air flow, and a cooling air passage for guiding the cooling air flow from the cooling air blower to an outer wall of the cylinder. Downstream of the outer wall of the cylinder, the cooling air channel has a channel region in which a plurality of partial cooling air streams are branched off from the cooling air flow (main cooling air flow).
  • the channel region is configured such that the cross section of the channel region, which relates to a flow direction of the cooling air flow, tapers to the extent that partial cooling air streams are branched off from the cooling air flow, so that the flow velocity of the cooling air flow in the channel region remains substantially constant. While the cooling air duct is to define the entire length of the cooling air flow from the cooling air fan to the outlet from the hammer, the channel region indicates only a partial region of the cooling air duct. For the following consideration, however, the channel area is of particular importance.
  • the cooling air passage in the region in which a cooling of the cylinder or the outer wall of the cylinder is to take place designed such that the flow rate of the cooling air flow (main cooling air flow) remains constant even if partial cooling air flows are already branched off.
  • the cross section of the channel region is kept substantially constant, so that the flow velocity of the cooling air is gradually reduced when diverting partial cooling air streams.
  • the engine cooling air can be blown through the engine with comparatively low flow resistance. As a result, the volume flow is increased and thus lowered the temperature of the cooling air.
  • the engine delivers only the amount of heat necessary for him to the cooling air, whereby the cooling air also does not heat up so much.
  • a cooling air distribution is usually sought, in which the engine as much heat is removed, which is often not required.
  • a plurality of mutually parallel cooling fins may be formed, wherein in each case between two adjacent cooling fins, a partial channel is formed, for guiding a partial cooling air flow, wherein the partial cooling air flow is diverted from the zoom guided by the cooling air blower cooling air flow.
  • the cooling fins are provided on the outer wall of the cylinder in a known manner and usually cast with the cylinder housing in one piece or subsequently attached as cooling elements on the outer wall of the cylinder.
  • one of the subchannels is formed between the adjacent cooling fins, into which a respective partial cooling air flow is introduced.
  • the respective partial cooling air streams are gradually diverted from the main cooling air flow when the main cooling air flow passes the cooling fins of the cylinder becomes.
  • the channel region can be led past the cooling fins upstream of the cooling fins and thus past the subchannels or at the starting regions of the subchannels.
  • the channel region can be designed such that the cross section of the channel region tapers in the course along the initial regions of the respective sub-channels to the extent that partial cooling air streams are diverted from the cooling air flow, so that the above requirement is satisfied that the flow velocity of the cooling air flow in the channel area remains substantially constant.
  • the flow rates of the partial cooling air streams in the sub-channels may be substantially the same. In particular, they can also be the same as the flow velocity of the remaining cooling air flow in the channel region. In this way, a homogenization and optimization of the cooling air flow is achieved with the lowest possible flow resistance. An indication of unnecessary flow resistance would be e.g. a strong change in the flow velocity in the cooling air duct.
  • the cooling air flow is guided in a particularly advantageous manner. It can also be achieved that the impactor driven by the internal combustion engine of the hammer is cooled.
  • a cooling air passage for guiding the cooling air flow from the cooling air blower along an outer wall of the cylinder is provided, wherein the cooling air passage downstream of the outer wall of the cylinder has a channel portion for guiding the cooling air flow to an exhaust system of the internal combustion engine and / or to the impact mechanism.
  • the cooling air which has already warmed up as it flows past the cylinder, can continue to be used for cooling other hot components whose temperature during operation is above the temperature which is the temperature Has cooling air flow downstream of the cylinder.
  • These components include in particular the exhaust system of the internal combustion engine or the impact mechanism.
  • the engine cooling air is used to further components of the hammer, namely in particular the exhaust system, for. B.
  • cooling air coming from the engine ie from the outer wall of the cylinder (engine cooling air)
  • engine cooling air is still relatively cool and can therefore be used for cooling the other components.
  • the cooling air duct By clever design of the cooling air duct, it is thus possible to guide a suitable for each device cooling air flow.
  • downstream of the cylinder e.g. the cooling air flow can be performed either only to the exhaust system or only to percussion or to both modules.
  • it is possible to change the cooling air flow e.g. first to the percussion and then to run downstream of the percussion to the exhaust system.
  • the cooling air flow can first be passed to the exhaust system and subsequently to the hammer mechanism.
  • the cooling air flow can also be divided into two parallel cooling air streams, which flow in parallel to the exhaust system and the impact mechanism.
  • cooling air flow downstream of the outer wall of the cylinder is divided into two cooling air streams, wherein a cooling air flow is passed directly to the exhaust system and a second cooling air flow first to percussion and then only to the exhaust system.
  • the exact configuration of the cooling air channel and thus the guidance of the cooling air flow depends on the temperature distributions in the hammer and on the desired cooling effect.
  • the cooling air passage downstream of the outer wall of the cylinder has a first passage portion for guiding the cooling air flow to the striking mechanism.
  • the cooling air duct Downstream of the hammer mechanism, the cooling air duct has a second duct section for guiding the cooling air flow to the exhaust system. In this way, the cooling air flow is first routed serially to the striking mechanism and then to the exhaust system.
  • the cooling air duct is divided downstream of the outer wall of the cylinder into a first cooling air duct for a first cooling air flow and into a second cooling air duct for a second cooling air flow.
  • the first cooling air channel serves to guide the first cooling air flow to an exhaust system of the internal combustion engine, while the second cooling air channel serves to guide the second cooling air flow to the impact mechanism.
  • the percussion mechanism can be an air spring impact mechanism and a guide housing and one of the internal combustion engine in the guide housing z.
  • the first channel section can also be designed to guide the cooling air flow to the outside of the guide housing.
  • the heat in the percussion mechanism arises, in particular, in the vicinity of the air compression area inside the striking mechanism, when the percussion mechanism is a per se known air spring impact mechanism. This heat is released via the guide housing to the outside and can be removed by the cooling air flow. Since the temperature generated in the impact mechanism is greater than the temperature of the engine cooling air, the engine cooling air can still be used effectively for cooling the impact mechanism.
  • the second cooling air duct may be configured such that the second cooling air flow downstream of the striking mechanism can also be guided to the exhaust system of the internal combustion engine.
  • the variants described above can be combined with each other as desired.
  • the two variants can also be combined with each other to achieve a particularly effective cooling.
  • Fig. 2 shows the hammer of Figure 1 in left side view.
  • Fig. 3 is a sectional view of the hammer;
  • Fig. 4 is a perspective bottom view of the hammer.
  • Figures 1 to 4 show in various views a schematic example of a drilling and / or percussion hammer according to the invention.
  • the hammer has an internal combustion engine 1, which drives a striking mechanism 5 via a first crank drive 2, a transmission 3 and a second crank drive 4.
  • the striking mechanism 5 in turn acts upon a tool 6, in the present example a chisel.
  • the structure of such a hammer is widely known and therefore need not be explained in detail.
  • the internal combustion engine 1 has a cylinder 7, in the interior of which a piston 8 is movably guided.
  • the piston 8 drives the first crank mechanism 2 via a connecting rod 9.
  • a crankshaft 10 of the crank mechanism 2 the transmission 3 and thus the second crank mechanism 4 is moved.
  • the percussion mechanism 5 is designed as a pneumatic spring impact mechanism and has a connecting rod 1 1 moved by the second crank mechanism 4, which moves a drive piston 12 back and forth in a guide housing 13 belonging to the percussion mechanism.
  • a percussion piston 14 In the interior of the drive piston 12, a percussion piston 14 is guided, which is moved via a formed between the drive piston 12 and the percussion piston 14 air spring 15 against the end of the tool 6 and returned.
  • the function of such impact mechanism 5 is known and does not need to be deepened at this point.
  • a cooling air blower 16 with a fan 17, a fan housing 18 and a cooling air inlet 19 is arranged.
  • the fan 17 is driven in rotation by the crankshaft 10 and sucks in the process. on the cooling air inlet 19 at.
  • the cooling air is then passed through a cooling air duct 20 to the components of the hammer to be cooled.
  • the cooling air passage 20 leads the cooling air to an outer wall of the cylinder 7, at which numerous cooling fins 21 are arranged in a known manner.
  • FIG. 3 only two of the cooling ribs 21 are identified by the reference numeral 21 for reasons of clarity.
  • the outer wall of the cylinder 7 has a plurality of cooling fins 21, as can be seen directly from FIG.
  • respective partial channels 22 are formed, in which the air flow from the cooling air channel 20 can be guided past the outer wall of the cylinder 7.
  • Each of these sub-channels 22 thus branches off a partial cooling air flow from the main cooling air flow in the channel region of the cooling air channel 20 lying upstream of the cylinder 7.
  • the cooling air flow in the cooling air duct 20 flows from above, ie. H. coming from the cooling air blower 16 in the downward direction, wherein in said channel region gradually cooling air streams are diverted via respective sub-channels 22 and guided past the outer wall of the cylinder 7.
  • the cooling air channel 20 tapers to the extent that cooling air is diverted from it into the respective sub-channel 22.
  • the cross section of the cooling air duct 20 should be reduced in such a way that the flow velocity of the cooling air flow in the cooling air duct 20 provided upstream of the cylinder 7 remains constant.
  • this taper can be seen by a sloping channel cover 23.
  • the cross-sectional taper of the cooling air duct can be seen in Figure 4 where the duct cover 23 begins at a duct inlet 24 relative to an operating position of the hammer with vertically downwardly directed working direction both vertically downwards and horizontally away from the duct inlet 24 runs obliquely and thus the Cooling air duct 20 tapers.
  • the channel inlet 24 is shown in dashed lines in Figure 4, since it is of course not visible from the outside under the channel cover 23.
  • the thus caused in the cooling air passage 20 and in the various sub-channels 22 cooling air flow largely has a constant, same speed, which is positive for optimized engine cooling.
  • the cooling air can be discharged downstream of the internal combustion engine 1, ie downstream of the outer wall of the cylinder 7 to the environment.
  • the cooling air coming from the engine is further used for cooling components which heat up during operation of the hammer.
  • the cooling air duct 20 is divided into a first cooling air duct 26 and a second cooling air duct 27 at an outlet 25, at which the cooling air is led away from the cooling ribs 21 and the outer wall of the cylinder 7.
  • the division is carried out by means of baffles 28 and 29.
  • the baffles 28, 29 may be suitably formed in space to guide the respective cooling air flows to the areas to be cooled.
  • a first cooling air flow is guided and guided to an exhaust system 30 of the internal combustion engine 1, in particular to a silencer.
  • the exhaust system 30 with the muffler is particularly hot during operation of the hammer, so that the cooling air coming from the engine, although already heated, can still contribute to the cooling of the exhaust system 30.
  • the exhaust system 30 is not in turn other components of the hammer, such as. B. can heat the fuel supply, the tank or the carburetor during prolonged operation of the hammer in an inadmissible manner.
  • the second cooling air channel 27 leads the second cooling air flow as cooling air to the percussion mechanism 5, in particular to the outer wall of the guide housing 13 of the percussion mechanism 5 and there to a region of the impact mechanism 5, in which a compression of the air spring 15 takes place.
  • a strong warming in the striking mechanism 5 is effected.
  • This heat can be dissipated by the second cooling air flow in the second cooling air channel 27.
  • the second cooling air flow after passing on the percussion 5 also the exhaust system 30 perform, so that the second cooling air flow, which was heated by the striking mechanism 5 only relatively small, also also for cooling the hot muffler in the exhaust system 30 can be used.
  • the engine cooling-air air after passing on the outer wall of the cylinder 7, is conducted directly to the further hot heat sources of the hammer and has a cooling effect, areas on the hammer whose temperature lies below the engine cooling-air air are indirectly further cooled. This is achieved by passing less heat into surrounding components or components by cooling near the heat source so that they also remain cooler.
  • the cooling air duct in such a way that the cooling air, after flowing past the cylinder 7, is first led to the outer wall of the guide housing 13 and subsequently along the exhaust system 30. Likewise, the cooling air can also be routed exclusively to the exhaust system 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Exhaust Silencers (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

L'invention concerne un marteau perforateur et/ou percuteur qui présente un canal d'air de refroidissement (20) pour guider un courant d'air de refroidissement depuis une soufflante (16) d'air de refroidissement jusqu'à une paroi extérieure d'un cylindre (7) d'un moteur à combustion interne (1). Le canal d'air de refroidissement est configuré de telle sorte qu'il se rétrécisse de telle sorte que des courants d'air de refroidissement partiels guidés entre des nervures de refroidissement (21) respectives soient déviés du courant d'air de refroidissement principal. De ce fait, la vitesse d'écoulement du courant d'air de refroidissement dans le canal d'air de refroidissement (20) est essentiellement constante, ce qui provoque un refroidissement optimisé du moteur. En outre, il est possible de diviser le canal d'air de refroidissement (20) en aval du cylindre (7) en deux canaux d'air de refroidissement (26, 27). L'un des canaux d'air de refroidissement conduit de l'air de refroidissement à une installation de gaz d'échappement (30) du moteur à combustion interne (1), tandis que l'autre canal d'air de refroidissement (27) conduit de l'air de refroidissement jusqu'à une paroi extérieure d'un boîtier de guidage (13) d'un mécanisme percuteur (5). De ce fait, des sources de chaleur spécifiques peuvent être refroidies à l'intérieur du marteau.
EP11700320.2A 2010-01-15 2011-01-13 Marteau perforateur et/ou percuteur avec refroidissement des composants de l'appareil Active EP2523780B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010004724A DE102010004724A1 (de) 2010-01-15 2010-01-15 Bohr- und/oder Schlaghammer mit Kühlung von Gerätekomponenten
PCT/EP2011/000134 WO2011085989A1 (fr) 2010-01-15 2011-01-13 Marteau perforateur et/ou percuteur avec refroidissement des composants de l'appareil

Publications (2)

Publication Number Publication Date
EP2523780A1 true EP2523780A1 (fr) 2012-11-21
EP2523780B1 EP2523780B1 (fr) 2020-03-04

Family

ID=43662075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11700320.2A Active EP2523780B1 (fr) 2010-01-15 2011-01-13 Marteau perforateur et/ou percuteur avec refroidissement des composants de l'appareil

Country Status (5)

Country Link
US (1) US9272407B2 (fr)
EP (1) EP2523780B1 (fr)
CN (1) CN102770245B (fr)
DE (1) DE102010004724A1 (fr)
WO (1) WO2011085989A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108890374A (zh) * 2018-07-22 2018-11-27 苏州优康通信设备有限公司 一种通信器材的钻孔设备

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201413008D0 (en) 2014-07-23 2014-09-03 Black & Decker Inc A range of power tools
CN106012787B (zh) * 2016-05-31 2017-12-19 福州麦辽自动化设备有限公司 一种基于液压阀控制的钎杆触发破碎锤
US10710923B2 (en) * 2017-10-26 2020-07-14 Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. Wheel cutter for cutting a flexible glass substrate and cutting method thereof

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GB632560A (en) * 1944-07-13 1949-11-28 Carl Stanley Weyandt Improvements in or relating to a percussion tool
DE866633C (de) * 1950-04-29 1953-02-12 Gustav Albert Bergman Anordnung an Verbrennungsmotoren, insbesondere fuer Gesteinsbohrmaschinen
US2764138A (en) 1953-03-02 1956-09-25 Atlas Copco Ab Percussion tools having a reciprocable hammer piston actuated by combustion gases
US2857888A (en) * 1957-05-17 1958-10-28 Syntron Co Portable internal combustion percussion tools
DE2016964B2 (de) * 1970-04-09 1977-09-15 Robert Bosch Gmbh, 7000 Stuttgart Von hand gefuehrter hammer mit eingebautem elektrischen antriebsmotor
US3718193A (en) * 1971-02-18 1973-02-27 Bosch Gmbh Robert Cooling system for portable impulse transmitting machines
JPS48111601U (fr) * 1972-03-31 1973-12-21
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JP2000052277A (ja) * 1998-08-12 2000-02-22 Hitachi Koki Co Ltd 打撃工具
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ATE361182T1 (de) * 2001-10-15 2007-05-15 Hilti Ag Kühlluftleitung für ein elektrohandwerkzeuggerät mit elektropneumatischem schlagwerk
CN2688454Y (zh) * 2004-03-25 2005-03-30 苏州宝时得电动工具有限公司 电动工具的冷却结构
DE102004058696A1 (de) * 2004-12-06 2006-06-08 Hilti Ag Elektrowerkzeuggerät
DE102005036560A1 (de) * 2005-08-03 2007-02-08 Wacker Construction Equipment Ag Bohr- und/oder Schlaghammer mit Linearantrieb und Luftkühlung

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See references of WO2011085989A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108890374A (zh) * 2018-07-22 2018-11-27 苏州优康通信设备有限公司 一种通信器材的钻孔设备

Also Published As

Publication number Publication date
US20130098650A1 (en) 2013-04-25
US9272407B2 (en) 2016-03-01
CN102770245B (zh) 2016-01-20
CN102770245A (zh) 2012-11-07
DE102010004724A1 (de) 2011-07-21
EP2523780B1 (fr) 2020-03-04
WO2011085989A1 (fr) 2011-07-21

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