EP2047951B1 - Machine-outil manuelle dotée d'un entraînement par manivelle - Google Patents

Machine-outil manuelle dotée d'un entraînement par manivelle Download PDF

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Publication number
EP2047951B1
EP2047951B1 EP08105405A EP08105405A EP2047951B1 EP 2047951 B1 EP2047951 B1 EP 2047951B1 EP 08105405 A EP08105405 A EP 08105405A EP 08105405 A EP08105405 A EP 08105405A EP 2047951 B1 EP2047951 B1 EP 2047951B1
Authority
EP
European Patent Office
Prior art keywords
crankshaft
hand
power tool
hollow
held power
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.)
Not-in-force
Application number
EP08105405A
Other languages
German (de)
English (en)
Other versions
EP2047951A1 (fr
Inventor
Josef Fünfer
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP2047951A1 publication Critical patent/EP2047951A1/fr
Application granted granted Critical
Publication of EP2047951B1 publication Critical patent/EP2047951B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • 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
    • B25D2211/006—Parallel drill and motor spindles
    • 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
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/24—Aluminium

Definitions

  • the invention relates to a hand tool machine with a connecting rod and an axially rotatable crankshaft, in particular an at least partially striking combination hammer or a chisel hammer according to the preamble of claim 1 and as from EP 0 583 710 A or the GB 24090 A known.
  • crank gear is used to implement the rotational movement in a reciprocating motion to drive the exciter piston, which drives the shank piston via an air spring, which generates the impact on the tool.
  • the connecting rod and the, these via an eccentric crank pin driving, axially rotatable crankshaft are solid to achieve a sufficient component rigidity and component strength.
  • the connecting rod is a strongly (alternately) accelerated component. A reduction in their mass thus leads to economies of scale in the mass reduction in other components. Therefore, for example, after the DE3910599 the connecting rod formed hollow.
  • the gears of the transmission and the crankshaft contributes a high mass of these parts to a high rotational moment of inertia, which in principle is desirable because of the stored rotational energy for the synchronization.
  • a high mass increases, without providing an added benefit, as is the case, for example, in the conduction of the magnetic flux in the rotor, the entire machine mass.
  • DE3120834 is an internally mounted on a housing pin integral crankshaft coaxially hollow.
  • EP1355764 is an externally mounted one-piece crankshaft completely coaxially hollow.
  • the remaining wall thickness is in each case about one fifth of the diameter.
  • the task is to reduce the engine mass by a hollow, sufficiently stiff and strong crankshaft.
  • a hand tool machine has a crank mechanism with a connecting rod and a, the connecting rod on a crank pin overlapping, axially rotatable crankshaft, which is coaxially hollow and axially closed on both sides.
  • a crank pin bearing crank pin is hollow, whereby the component mass of the crankshaft is further reduced.
  • crankshaft Due to the design of the crankshaft as a coaxial hollow, but axially closed on both sides spatial form this forms a three-dimensionally closed surface (topologically similar to a spherical surface).
  • a substantial increase in component rigidity and component strength is achieved in comparison to the (topologically) two-fold axially open spatial forms given a given material, given wall thickness and (except for the axial termination) given spatial form, or a reduction of the wall thickness and thus of the component mass is made possible. This contributes to the reduction of the engine mass.
  • crankshaft is formed in two parts, in particular at the opposite axial end to the crank pin a plug is present, which closes the otherwise (topologically) simple open space form of the remaining crankshaft, whereby the latter by hydroforming (English hydroforming) can be produced inexpensively and technologically simple ,
  • the wall thickness of the remaining crankshaft (except for the plug) is less than one tenth of the associated shaft diameter, whereby the component mass of the crankshaft is further reduced.
  • crank pin itself is hollow, whereby the component mass and eccentricity of the crankshaft is further reduced.
  • two cylindrical bearing guides are formed on the crankshaft, each of which is advantageously associated with an axial stop, whereby (via one associated radial bearing) an externally guided bearing in the housing is supported.
  • crankshaft is radially tapered axially between the bearing guides, whereby the component mass of the crankshaft is minimized.
  • a rotary and beating hand tool 1 in the form of a combihammer a crank gear 2 for converting the rotational movement of a rotor 13 of the electric motor 14 in a reciprocating motion to drive the exciter piston 3, which drives the latching piston 5 via an air spring 4, via a Anvil 6 generates the impact on a tool 7 in the form of a drill bit.
  • the crank mechanism 2 has a connecting rod 8 and a, this via an eccentric crank pin 9 driving, axially rotatable crankshaft 10, which is guided in a radial bearing 11 in the housing 12.
  • crankshaft 10 With respect to a crank axis A coaxially hollow and axially closed on both sides, wherein at the opposite axial end to the crank pin 9, a plug 15 is present, which closes the otherwise simple open space shape of the remaining crankshaft 10.
  • the remaining crankshaft 10 is made by hydroforming from a tubular blank (not shown) made of an aluminum alloy.
  • the wall thickness W of this remaining crankshaft 10 is less than one-tenth of the associated shaft diameter D.
  • the crank pin 9 and a crank plate 16 carrying this itself is hollow.
  • On the crankshaft 10 are two axially spaced cylindrical bearing guides 17 for radial bearings 11 (FIGS. Fig. 1 ), each associated with an axial stop 18.
  • the crankshaft 10 is radially tapered axially between the bearing guides 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Drilling And Boring (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Adornments (AREA)

Claims (8)

  1. Machine-outil manuelle avec un entraînement par manivelle (2) avec une bielle (8) et avec un vilebrequin (10) axialement rotatif, supporté sur un maneton (9), le vilebrequin (10) étant coaxialement creux, le vilebrequin (10) étant axialement fermé des deux côtés, caractérisée en ce qu'un disque de bielle (16) supportant le maneton (9) est formé creux.
  2. Machine-outil manuelle selon la revendication 1, caractérisée en ce que le vilebrequin (10) est formé en deux parties.
  3. Machine-outil manuelle selon la revendication 2, caractérisée en ce qu'un bouchon (15) est présent sur l'extrémité axiale opposée au maneton (9) du vilebrequin (10), ledit bouchon obturant le reste du vilebrequin (10) sinon simplement ouvert.
  4. Machine-outil manuelle selon l'une quelconque des revendications 1 à 3, caractérisée en ce que l'épaisseur de paroi (W) du vilebrequin creux (10) est inférieure à un dixième du diamètre d'arbre (D) correspondant.
  5. Machine-outil manuelle selon l'une quel-5. Machine-outil manuelle selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le maneton (9) est formé en étant lui-même creux.
  6. Machine-outil manuelle selon l'une quelconque des revendications 1 à 4, caractérisée en ce que deux guides de paliers cylindriques (17) sont formés sur le vilebrequin (10).
  7. Machine-outil manuelle selon la revendication 6, caractérisée en ce qu'une butée axiale (18) est associée au guide de palier (17).
  8. Machine-outil manuelle selon la revendication 6 ou 7, caractérisée en ce que le vilebrequin (10) est radialement réduit de manière axiale entre les guides de paliers (17).
EP08105405A 2007-10-08 2008-09-23 Machine-outil manuelle dotée d'un entraînement par manivelle Not-in-force EP2047951B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007000827A DE102007000827A1 (de) 2007-10-08 2007-10-08 Handwerkzeugmaschine mit einem Kurbelgetriebe

Publications (2)

Publication Number Publication Date
EP2047951A1 EP2047951A1 (fr) 2009-04-15
EP2047951B1 true EP2047951B1 (fr) 2010-11-17

Family

ID=40219278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105405A Not-in-force EP2047951B1 (fr) 2007-10-08 2008-09-23 Machine-outil manuelle dotée d'un entraînement par manivelle

Country Status (3)

Country Link
EP (1) EP2047951B1 (fr)
AT (1) ATE488330T1 (fr)
DE (2) DE102007000827A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPN20110067A1 (it) * 2011-10-11 2013-04-12 Giovanni Zago Apparecchiatura di perforazione-demolizione pluri-cilindrica ad azione elettro-pneumatica

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191224090A (en) * 1912-10-22 1913-12-22 Electric Hammers Ltd Improvements in Power Operated Portable Hammers for use with Percussive Tools for Rivetting, Caulking, Chipping and the like.
DE2335924A1 (de) * 1973-07-14 1975-02-06 Bosch Gmbh Robert Handwerkzeugmaschine mit betriebszeitanzeigevorrichtung
DE3120834A1 (de) 1981-05-26 1982-12-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Pneumatisch arbeitender bohrhammer
DE3910599C2 (de) 1989-04-01 1994-11-17 Bosch Gmbh Robert Schmiervorrichtung für einen Bohr- und/oder Schlaghammer
DE4227288A1 (de) * 1992-08-18 1994-02-24 Bosch Gmbh Robert Bohrhammer
DE10103996C1 (de) 2001-01-30 2002-10-02 Wacker Werke Kg Luftfederschlagwerk für einen Schlag- und/oder Bohrhammer mit kurz bauendem Antriebskolben

Also Published As

Publication number Publication date
DE502008001811D1 (de) 2010-12-30
ATE488330T1 (de) 2010-12-15
DE102007000827A1 (de) 2009-04-09
EP2047951A1 (fr) 2009-04-15

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