EP0419866B1 - Bohrhammer - Google Patents

Bohrhammer Download PDF

Info

Publication number
EP0419866B1
EP0419866B1 EP90116431A EP90116431A EP0419866B1 EP 0419866 B1 EP0419866 B1 EP 0419866B1 EP 90116431 A EP90116431 A EP 90116431A EP 90116431 A EP90116431 A EP 90116431A EP 0419866 B1 EP0419866 B1 EP 0419866B1
Authority
EP
European Patent Office
Prior art keywords
intermediate shaft
hammer drill
gear
drill according
movement
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.)
Expired - Lifetime
Application number
EP90116431A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0419866A3 (en
EP0419866A2 (de
Inventor
Manfred Bleicher
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0419866A2 publication Critical patent/EP0419866A2/de
Publication of EP0419866A3 publication Critical patent/EP0419866A3/de
Application granted granted Critical
Publication of EP0419866B1 publication Critical patent/EP0419866B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • 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
    • B25D2211/003—Crossed 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
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms

Definitions

  • the invention relates to a hammer drill according to the preamble of claim 1.
  • a hammer drill in a so-called L-construction is already known, in which the striking mechanism and the Motor are arranged at right angles to each other.
  • the pinion of the motor meshes with a bevel gear arranged on an intermediate shaft. Therefore, this hammer builds very long in the axis direction of the engine, which makes the hammer unwieldy.
  • the hammer drill according to the invention with the characterizing features of claim 1 has the advantage that it is more compact and more manageable. It also has the advantage that a complete assembly with an intermediate shaft and impact drive and another assembly with an angular gear can be taken over by other hand tools. This leads to considerable cost savings.
  • a hammer drill 1 has a housing 2 in which an impact mechanism 3, a first intermediate shaft 4 and an electric drive motor 5 arranged perpendicular to the axis of the impact mechanism 3 are accommodated.
  • the hammer drill 1 has a tool holder 6 for a drilling or striking tool 7.
  • the housing 2 On the side facing away from the tool holder 6, the housing 2 carries, in a known manner, a closed handle 8, in which a trigger switch 9 is arranged, which controls the drive motor 5.
  • the handle 8 extends over the entire height H of the housing 2, which is determined by the length of the drive motor 5.
  • the pneumatic striking mechanism 3 with hollow piston 12 and striker 13 is, as in the hammer drill according to DE-OS 38 19 125, from one a swash hub 14 and a swash plate 15 existing movement conversion gear 16 in reciprocating movements.
  • the wobble hub 14 is held by a ball bearing 17 in an insert housing 18 connected to the housing 2.
  • the intermediate shaft 4 is arranged within the wobble hub 14 so as to be rotatable and axially displaceable relative to the latter.
  • the intermediate shaft 4 is perpendicular, that is in the direction of the axis of the drive motor 5, below the striking mechanism 3; but it can also be arranged obliquely below the striking mechanism 3.
  • the intermediate shaft 4 can be coupled and driven in rotation with a spur gear 20 via a clutch 19.
  • the spur gear 20 can optionally be coupled to the wobble hub 14 via a second clutch 21, as a result of which the striking mechanism 3 is activated.
  • the clutches 19, 21 are preferably dog clutches.
  • the intermediate shaft 4 also drives the tool holder 6 in a known manner. Striking mechanism 3, movement conversion gear 16 with swash plate 15 and intermediate shaft 4 together form an assembly 10 which comes from a smaller, higher-speed hammer with a motor arranged parallel to the striking mechanism axis, as described in DE-A-38 19 125.
  • the spur gear 20 engages in an axially elongated toothing 22 of a second intermediate shaft 23.
  • the second intermediate shaft 23 is arranged on the side of the first intermediate shaft 4 facing the striking mechanism 3, ie above it, and is held in two roller bearings 24 and 25.
  • the second intermediate shaft 23 carries at its end opposite the toothing 22 a bevel gear ring gear 26, the toothing 27 of which points in the direction of the first intermediate shaft 4.
  • a pinion 29 with a bevel gear is arranged, which meshes with the bevel gear 26 and together with this forms an angular gear 30.
  • the torque of the drive motor 5 is via the angular gear 30, which is also in the form of a conventional spur gear with ring gear can be transmitted to the second intermediate shaft 23.
  • the angular gear 30 forms an assembly 31 which can also be used in other handheld power tools.
  • the reduction of the angular gear causes a first reduction in the speed, which is greater the larger the diameter of the ring gear 26.
  • a further reduction of the speed takes place in the gear connection between the toothing 22 of the second intermediate shaft 23 and the spur gear 20.
  • the speed of the rotary hammer is reduced to values that enable working with drilling tools up to 30 millimeters in diameter.
  • the individual impact strength of the striking mechanism 3 increases and the impact number decreases in the desired manner.
  • the elongated toothing 22 in the second intermediate shaft 23 enables axial displacement of the spur gear 20 over a wide range, so that the couplings 19, 21 between the first intermediate shaft 4, the spur gear 20 and the wobble hub 14 by axial displacement of the first intermediate shaft 4 or the first Intermediate shaft 4 can be switched together with the spur gear 20 without the spur gear 20 disengaging from the toothing 22 of the second intermediate shaft 23.
  • the first intermediate shaft 4 is shown in the position in which it serves to transmit the rotary drive to the tool holder 6; the clutch 19 is engaged. If the intermediate shaft 4 is shifted to the left in the drawing, both clutches 19 and 21 come into engagement and the striking mechanism is additionally activated for rotary striking for rotary drive.
  • Striking mechanism 3 and drive motor 5 do not have to be arranged exactly perpendicular to one another; they can also be at a shallower angle to each other, the z. B. arises when a conventional cylindrical is used instead of the conical pinion 29.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP90116431A 1989-09-28 1990-08-28 Bohrhammer Expired - Lifetime EP0419866B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3932413 1989-09-28
DE3932413A DE3932413A1 (de) 1989-09-28 1989-09-28 Bohrhammer

Publications (3)

Publication Number Publication Date
EP0419866A2 EP0419866A2 (de) 1991-04-03
EP0419866A3 EP0419866A3 (en) 1991-05-02
EP0419866B1 true EP0419866B1 (de) 1993-10-27

Family

ID=6390402

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90116431A Expired - Lifetime EP0419866B1 (de) 1989-09-28 1990-08-28 Bohrhammer

Country Status (3)

Country Link
EP (1) EP0419866B1 (ja)
JP (1) JP2918057B2 (ja)
DE (2) DE3932413A1 (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202767C2 (de) * 1992-01-31 1999-06-02 Black & Decker Inc Bohrhammer
DE4401664B4 (de) * 1994-01-21 2008-12-18 Robert Bosch Gmbh Bohrhammer mit einer elektronischen Regeleinrichtung und einem Betriebsartenschalter
DE102005036731A1 (de) * 2005-08-04 2007-02-08 Robert Bosch Gmbh Kupplungsvorrichtung für eine Elektrowerkzeugmaschine und Elektrowerkzeugmaschine
DE102006027110A1 (de) * 2006-06-12 2007-12-13 Robert Bosch Gmbh Hydraulische Handhebelpresse
US8925646B2 (en) 2011-02-23 2015-01-06 Ingersoll-Rand Company Right angle impact tool
CN103894981A (zh) * 2012-12-25 2014-07-02 苏州宝时得电动工具有限公司 电锤
US9022888B2 (en) * 2013-03-12 2015-05-05 Ingersoll-Rand Company Angle impact tool
DE102017121720A1 (de) * 2017-09-19 2019-03-21 Metabowerke Gmbh Getriebeanordnung für eine angetriebene Werkzeugmaschine
JP7388875B2 (ja) * 2019-10-21 2023-11-29 株式会社マキタ 打撃工具
US11826891B2 (en) 2019-10-21 2023-11-28 Makita Corporation Power tool having hammer mechanism
JP7388874B2 (ja) * 2019-10-21 2023-11-29 株式会社マキタ ハンマドリル

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1467253A (en) * 1973-04-05 1977-03-16 Kango Electric Hammers Ltd Portable percussive tools
DE3423919A1 (de) * 1984-06-29 1986-01-09 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE3819125A1 (de) * 1988-06-04 1989-12-14 Bosch Gmbh Robert Bohrhammer
DE3829683A1 (de) * 1988-09-01 1990-03-15 Black & Decker Inc Bohrhammer

Also Published As

Publication number Publication date
DE59003228D1 (de) 1993-12-02
EP0419866A3 (en) 1991-05-02
JPH03117572A (ja) 1991-05-20
JP2918057B2 (ja) 1999-07-12
EP0419866A2 (de) 1991-04-03
DE3932413A1 (de) 1991-04-11

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