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
• • 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
  • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools

Definitions

• the invention relates to a hand tool according to the preamble of claim 1.
• Cordless drills or cordless screwdrivers are usually very compact and have the gear reduction to a single or multi-stage planetary gear.
• a planetary gear speak the compact and ergonomically well into the Salesforce ⁇ machine to be integrated design and the ability to transfer high performance with great robustness and smoothness.
• Such a cordless screwdriver is known for example from DE 197 37 234 Al.
• the invention is based on a handheld power tool with a motor, a planetary gear and a tool holder, It is proposed that the hand tool machine has an air movement means arranged in front of the engine as seen from the tool holder for generating a cooling air flow which cools the planetary gear.
• the hand tool machine has an air movement means arranged in front of the engine as seen from the tool holder for generating a cooling air flow which cools the planetary gear.
• a gearbox with a very high power and at the same time a long service life can be achieved.
• the air movement means in front of the engine, that is to say in particular in the immediate vicinity of the planetary gear, effective cooling of the planetary gear can be achieved.
• the motor of the portable power tool can additionally be cooled with a further air movement means as seen from the tool holder behind the engine.
• the invention is particularly suitable for a cordless power tool, in particular a cordless screwdriver, cordless drill or Akkuschlagbohrschrauber.
• the air movement means is integrated in the planetary gear.
• the transmission can be mounted together with the air movement means as an assembly in the power tool and thus the assembly costs are reduced.
• the place of origin of the heat, namely the planet wheels, can be cooled particularly effectively.
• the air movement means between the engine and a gear stage of the planetary gear angeord ⁇ net can be driven before a reduction and thus with high rotational speed.
• a particularly simple rotational drive of the air movement means can be achieved if it is positively connected with a motor pinion. It is possible to dispense with a form-locking geometry of the motor shaft for driving the air movement means, and the motor shaft can be configured cost-effectively in this way.
• the positive connection can be made particularly easy if the teeth of the motor pinion engage in a corresponding counter-shape of the air movement means.
• a stable concentricity of the air movement means can be achieved if the air movement means is supported on the motor shaft.
• the rotational drive is advantageous - A -
• the air movement means be provided for generating a cooling air flow flowing through the planetary gear.
• heat generated in the planetary gear can be discharged from the planetary gear in a particularly effective manner.
• the planetary gear comprises a Ge housing comprising at least one opening in front of and behind the inner planetary gear components. The direction in front and behind refers to a view from the direction of the tool holder.
• the handheld power tool has a housing with at least one first and one second ventilation opening and a ventilation duct which runs through the planetary gear through the first ventilation opening to the second ventilation opening.
• the housing is in this case advantageously an outer housing, so that air can flow from outside the hand tool through the planetary gear.
• the ventilation duct is expediently flowed through in one direction during operation of the handheld power tool.
• a particularly good heat emission from the planetary gear can be achieved if the first and the second ventilation opening are arranged in front of or behind at least one element of the planetary gear.
• a good cooling of the planetary gears can be achieved if the planetary gears are mounted on a holding means having axially extending openings in a radia ⁇ len range of the planet gears.
• the planetary gear Through a ventilation duct, which extends from a coupling region of the power tool continuously to the engine, the planetary gear can be particularly completely flowed through and heat can be dissipated particularly well.
• a high cooling capacity of a toothed wheel of the planetary gear can be achieved if the air movement means is arranged in the immediate vicinity of the toothed wheel.
• the gear is, for example, a planetary gear. The immediacy remains ensured if a narrow air gap remains between the toothed wheel and the air moving means to provide a movement difference. However, this air gap is component-free.
• a cordless screwdriver is usually used in both directions of rotation.
• a cooling of the planetary gear is therefore particularly effective if the air movement means is rotatable in two directions of rotation and generates an air flow in the same direction in both directions of rotation.
• the air flow direction is thus independent of the direction of rotation of the hand tool or of the air movement means.
• the air movement means may for this purpose have wings whose wing surfaces are oriented perpendicular to the directions of rotation. Particularly advantageous is the design of the wing with at least two Blade surfaces, wherein a blade surface at least partially directs the air in a first direction of rotation in an axial direction and the other blade surface at least partially directs the air in the same direction opposite to the first direction of rotation in the same axial direction.
• a good ventilation geometry combined with a high strength of the air movement means can be achieved if the air movement means comprises wings whose extent in a direction of rotation is greater than their extent in the axial direction.
• the air movement means generates a radially directed air flow and comprises a deflection means for deflecting the air flow in the axial direction. It is sufficient in this case if the air flow is at first directed at least partially in the radial direction.
• the deflection means is advantageously part of the air movement means and rotatable therewith and may be formed by a bevel on a wheel, the wings of the air movement means zu ⁇ sammen schizophrenia at its radially outer end.
• FIG. 1 is a partial view of a cordless screwdriver with a removed housing shell
• FIG. 2 shows the removed housing shell of the battery charger of FIG. 1, FIG.
• FIG. 3 is an exploded view of a motor, a Gereteabdeckin, a Heiloniasmit ⁇ and a motor pinion,
• Fig. 5 shows another air moving means in the form of a fan
• Fig. 6 the fan from Figure 5 from the front.
• FIG. 1 shows a handheld power tool in the form of an electric screwdriver 2 with an indicated tool receptacle 4 and a housing comprising two housing shells 6 and a front housing element 8.
• One of the housing shells 6 is shown in FIG. 2 alone.
• a motor 10 is arranged, which is connected to a rear Lucasbewe ⁇ gungssch in the form of a fan, which is not shown in the figures.
• a planetary gear 12 is arranged, which is shown cut in FIG. From the pia Netengetriebe 12 is visible in Figure 1, a slide 18 with a serving as an air duct opening 16th
• the motor 10 comprises a motor shaft 20 (FIGS. 3 and 4) on which a toothed wheel in the form of a motor pinion 22 is pushed open.
• the motor pinion 22 forms part of the planetary drive 12 and drives planetary gears 24, which roll off within a ring gear 26.
• a planetary carrier 28 is rotated, which in turn drives a further toothing wheels 30 via a toothing 30, which roll in a second ring gear 34.
• the planet gears 32 of the second gear stage actuate another planet carrier 36.
• the planetary gear 12 is connected to the outside by a Getrie ⁇ beplatte 39 in conjunction with the planet carrier 36, the Ge drive sleeve 14 and a retaining plate 40 is substantially kill closed.
• the holding plate 40 is connected via a positive connection with the transmission sleeve 14 and causes the rotational Ver ⁇ locking of the motor 10 in the transmission sleeve 14 and by spacers 41 an axial distance support of the ring gear 26 of the first planetary gear stage.
• Both between the planetary carrier 36 and the gear plate 39 and in the retaining plate 40 openings 42, 44 are provided to allow an air flow through the planetary gear 12.
• This air flow is driven by a Heiltowns ⁇ medium 46, which is designed as a fan.
• the fan is arranged predominantly within the planetary gear 12 and is rotationally driven by a positive connection with a neck 48 of the motor pinion 22 from the motor pinion 22.
• the fan is on the neck 48 by means of a Matched fit arranged to allow certain tolerances.
• the fan is mounted in a concentric bearing 50 mainly directly on the motor shaft 20 and is held centered by the motor shaft 20.
• the air movement means 46 between the planetary gear 12 and a bearing 52 of the motor shaft 20 is arranged.
• the fan between the retaining disk 40 and the planetary gears 24, ie within the planetary gear 12, 12 is arranged.
• a thrust washer 53 is arranged between the fan wheel and the planet wheels 24.
• an air flow is primarily generated in the radial direction 58 by twelve wings 56 of the fan wheel oriented in the axial direction 54, which are formed by inclined surfaces 60, which are formed on a wheel 62 that holds the vanes 56 together at their radially outer end , at least partially in the axial direction 54 deflected, in the direction of the motor 10.
• Such a be ⁇ wegter air flow is through the openings 44 in the Gar ⁇ disc 40 in the direction of arrow 64 to the motor 10 and on this sem along pressed.
• this Gut ⁇ stream is directed out of ventilation openings 66 in the housing shells 6 from the power tool.
• FIGS. 5 and 6 show a further air movement means 78 in a rear or front view.
• This air movement means 78 which is also configured as a fan wheel, can be positively locked to the motor pinion by means of a clearance 80, which is shaped as a negative tooth form suitable for the toothing of the engine pinion 22 22 are connected and taken by this in Tangential- direction 82.
• the air movement means 78 comprises a further fit 84 for mounting directly on the motor shaft 20.
• the air movement means 78 comprises eight vanes 86, each one a first and a second oblique, hollow curved Schaufel ⁇ surface 88, 90 have.
• the air flow through the first blade surface 88 is pressed radially outward and axially to the rear.
• the radially outwardly pressed part of the air flow is likewise pressed back in the axial direction 54 by a hollow curved inclined surface 92 of a wheel 94 connecting the radial outer ends of the vanes 86.
• a rearward directed air flow which cools the planetary gear 12 as described above.
• the second blade surface 90 presses the air stream radially outward and axially to the rear, so that in an analogous manner an air flow to the rear - and thus by the suction air flow through the planetary gear 12 - is generated.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Portable Power Tools In General (AREA)
• Retarders (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=35257960

Family Applications (1)

Country Status (5)

Families Citing this family (12)

Family Cites Families (17)

• 2004
  • 2004-11-17 DE DE102004055268A patent/DE102004055268A1/de not_active Withdrawn
• 2005
  • 2005-09-14 EP EP05792128A patent/EP1824644A2/de not_active Withdrawn
  • 2005-09-14 CN CNA2005800392844A patent/CN101060958A/zh active Pending
  • 2005-09-14 WO PCT/EP2005/054571 patent/WO2006053794A2/de active Application Filing
  • 2005-09-14 US US10/579,478 patent/US20070056759A1/en not_active Abandoned

Non-Patent Citations (1)

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