EP0473908A2 - Marteau à foreuse et/ou à coup - Google Patents

Marteau à foreuse et/ou à coup Download PDF

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Publication number
EP0473908A2
EP0473908A2 EP91111631A EP91111631A EP0473908A2 EP 0473908 A2 EP0473908 A2 EP 0473908A2 EP 91111631 A EP91111631 A EP 91111631A EP 91111631 A EP91111631 A EP 91111631A EP 0473908 A2 EP0473908 A2 EP 0473908A2
Authority
EP
European Patent Office
Prior art keywords
armature shaft
sleeve
hammer
hammer drill
bearing
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
EP91111631A
Other languages
German (de)
English (en)
Other versions
EP0473908A3 (en
EP0473908B1 (fr
Inventor
Karl Frauhammer
Frank Müller
Heinz Ing. Schnerring
Heinz Dr.Dipl.-Ing. Neubert
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 EP0473908A2 publication Critical patent/EP0473908A2/fr
Publication of EP0473908A3 publication Critical patent/EP0473908A3/de
Application granted granted Critical
Publication of EP0473908B1 publication Critical patent/EP0473908B1/fr
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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/26—Lubricating

Definitions

  • the invention is based on a hammer drill and / or percussion hammer according to the preamble of claim 1.
  • hammers with grease-lubricated gear pairs which are arranged above the electric motor in the position of use, there is a risk of grease escaping into the motor area if there is no sealing, which in particular can lead to an early failure of the hammer when penetrating the brush apparatus.
  • grinding seals have been used to seal the armature shaft, e.g. Shaft seals (DE-OS 32 35 544), cover plates or felt rings are used. If these seals wear out and due to the constant stress caused by the lubricant acting on them in the direction of gravity, there is a certain risk of grease entering the motor area during continuous operation.
  • the hammer and / or percussion hammer according to the invention with the characterizing features of claim 1 has the advantage that lubricant of any consistency is constantly promoted away from the armature shaft bearing in the grease space of the transmission.
  • the conveyor spiral works completely wear-free, without power consumption and without Heat development.
  • the conveying helix conveys lubricant from the gearbox-side anchor bearing located below the grease level of the hammer back into the grease space of the gearbox, which is not possible, for example, with centrifugal disks, which in this case would only whisk and separate the grease.
  • the conveyor helix has the further advantage that neither the surface of the bore in the housing nor the outer diameter of the conveyor helix have to be subjected to high surface quality requirements, as is necessary with grinding elastomer seals.
  • the gear-side roller bearing is additionally sealed by non-grinding sealants such as sealing washers. These keep the engine compartment free of lubricants even when the engine is at a standstill.
  • the conveyor spiral has its best effect if it reaches as far as or even into the gearbox-side roller bearing.
  • a conveying effect is brought about by an annular gap formed by the housing around the conveying helix.
  • a sealing ring in particular an O-ring between the armature shaft and roller bearing, prevents grease from penetrating at this point and enables a sliding seat for easier dismantling of the motor in the event of a repair.
  • the conveyor spiral can either be incorporated directly into the armature shaft or into a sleeve placed on the armature shaft.
  • a sleeve has the advantage that the armature shaft does not need to be changed and the rolling bearing can be pressed directly onto the sleeve.
  • the armature shaft can in turn be seated in the sleeve with a sliding seat and an O-ring seal. This simplifies the dismantling of the motor in the event of a repair and has the further advantage that when the hammer is dismantled, no worn sealing elements have to be replaced or run-in shafts have to be reworked.
  • FIG. 1 shows a partial section through a hammer drill and / or hammer.
  • FIG. 2 shows the area of the armature shaft in a first exemplary embodiment.
  • Figure 3 shows a second embodiment,
  • Figure 4 shows a third embodiment,
  • Figure 5 shows a sleeve according to the third embodiment in section and
  • Figure 6 shows a plan view of the armature shaft and the sleeve according to the third embodiment.
  • a hammer drill has a housing 2, which forms an upper closed grease chamber 3, in which grease-lubricated gear parts, such as a gear wheel 5 arranged on an intermediate shaft, a striking mechanism 6 and other parts, are accommodated.
  • an electric motor 8 is arranged below the chamber 3 in the housing 2.
  • An armature shaft 9 of the electric motor projects upwards into the chamber 3 of the housing 2.
  • the armature shaft 9 is mounted upwards towards the gear parts in a roller bearing 10, which is held in the housing 2 and can also be designed as a plain bearing.
  • the gear-side bearing 10 is, as can be seen, for example, from FIG. 2, sealed at the top and bottom by non-grinding sealants, in particular sealing disks 11.
  • the armature shaft 9 carries an output pinion 14 at its end projecting into the grease chamber 3.
  • the inner ring 12 of the roller bearing 10 lies directly against the armature shaft 9.
  • an O-ring 13 is inserted into a groove in the armature shaft.
  • a feed spiral 16 is incorporated as a right-handed thread in the right-handed armature shaft 9. The conveying spiral 16 thus engages a part in the inner ring 12 of the roller bearing 10 and ends above a chamber 3 delimiting Housing base 17.
  • the housing base 17 forms the lower boundary of the grease chamber in which the grease-lubricated gear parts of the hammer are located.
  • An annular gap 19 is formed between the inner ring 12 and the conveyor spiral 16 or between a housing collar 18 and the conveyor spiral 16, in which the lubricant is conveyed upwards from the bearing 10 into the grease chamber 3. Even at high engine speeds, which are between 9,000 and approximately 20,000 revolutions per minute, the conveyor spiral 16 does not lead to the fat being mixed or segregated.
  • the second exemplary embodiment according to FIG. 3 is basically constructed in the same way as the first, equivalent components have the same reference numbers or are supplemented by a prime.
  • the armature shaft 9 ' is tapered at its end.
  • a sleeve 21 is placed, in the outer wall of which a spiral conveyor 16 'is incorporated.
  • the sleeve 21 is pressed onto the armature shaft 9 'in the region of a particularly long toothed runout of the output pinion 14. Otherwise, the feed spiral 16 'on the sleeve 21 has the same function as the feed spiral 16 incorporated directly into the armature shaft 9.
  • the third exemplary embodiment according to FIGS. 4 to 6 is similar to the first two exemplary embodiments; Identical or similar parts are provided with the same reference numbers or with two prime lines.
  • the tapered end of the armature shaft 9 ′′ is pushed into a sleeve 21 ′′ with a sliding fit and sealed by means of an O-ring 13.
  • the sleeve 21 is longer than the sleeve 21 and carries a stop collar 22 at its motor end.
  • a roller bearing 10 with sealing washers 11 is pressed onto the sleeve 21", the inner ring 12 of which rests on the collar 22.
  • the sleeve 21 has an inwardly directed, inwardly hexagonal collar 23 which engages in the driven pinion 14 with six teeth.
  • the sleeve 21" is rotatably driven relative to the armature shaft 9 ".
  • the sleeve 21 " carries a conveyor helix 16" which extends into the area of the roller bearing 10.
  • the conveyor helix ends at the gear end of the sleeve 21 ", which protrudes beyond the housing base 17".
  • the sliding fit between the armature shaft 9 and sleeve 21 “allows the motor 8 to be easily pulled out downwards for repair or maintenance purposes and reinserted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP91111631A 1990-08-25 1991-07-12 Marteau à foreuse et/ou à coup Expired - Lifetime EP0473908B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4026946A DE4026946A1 (de) 1990-08-25 1990-08-25 Bohr- und/oder schlaghammer
DE4026946 1990-08-25

Publications (3)

Publication Number Publication Date
EP0473908A2 true EP0473908A2 (fr) 1992-03-11
EP0473908A3 EP0473908A3 (en) 1992-05-20
EP0473908B1 EP0473908B1 (fr) 1995-03-22

Family

ID=6412936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111631A Expired - Lifetime EP0473908B1 (fr) 1990-08-25 1991-07-12 Marteau à foreuse et/ou à coup

Country Status (2)

Country Link
EP (1) EP0473908B1 (fr)
DE (2) DE4026946A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0925882A2 (fr) * 1997-12-01 1999-06-30 Black & Decker Inc. Outil motorisé avec système de lubrification
WO2001055623A1 (fr) * 2000-01-28 2001-08-02 Robert Bosch Gmbh Dispositif pour etancheifier un volume
CN101520091A (zh) * 2008-02-28 2009-09-02 昆山密友实业有限公司 流体动压型釜用密封机械

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10045620A1 (de) * 2000-09-15 2002-04-04 Bosch Gmbh Robert Werkzeugmaschine mit einem Raum mit Schmiermittel und einer Druckausgleichseinrichtung des Raums
DE10045618A1 (de) * 2000-09-15 2002-04-04 Bosch Gmbh Robert Werkzeugmaschine mit einem Raum mit Schmiermittel und einer Druckausgleichseinrichtung des Raums

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1915934A1 (de) * 1969-03-28 1970-10-08 Dornier System Gmbh Vorrichtung zum Abdichten von Wellen
US3937477A (en) * 1973-12-26 1976-02-10 Borg-Warner Corporation Mechanical seal system
EP0049719A1 (fr) * 1980-10-09 1982-04-21 John Crane-Houdaille, Inc. Double joint d'étanchéité à friction réduite
DE3235544A1 (de) * 1982-09-25 1984-03-29 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1915934A1 (de) * 1969-03-28 1970-10-08 Dornier System Gmbh Vorrichtung zum Abdichten von Wellen
US3937477A (en) * 1973-12-26 1976-02-10 Borg-Warner Corporation Mechanical seal system
EP0049719A1 (fr) * 1980-10-09 1982-04-21 John Crane-Houdaille, Inc. Double joint d'étanchéité à friction réduite
DE3235544A1 (de) * 1982-09-25 1984-03-29 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0925882A2 (fr) * 1997-12-01 1999-06-30 Black & Decker Inc. Outil motorisé avec système de lubrification
EP0925882A3 (fr) * 1997-12-01 2002-01-02 Black & Decker Inc. Outil motorisé avec système de lubrification
WO2001055623A1 (fr) * 2000-01-28 2001-08-02 Robert Bosch Gmbh Dispositif pour etancheifier un volume
US6971651B2 (en) 2000-01-28 2005-12-06 Robert Bosch Gmbh Device for sealing a space
CN100387871C (zh) * 2000-01-28 2008-05-14 罗伯特·博施有限公司 用于密封一个室的装置
CN101520091A (zh) * 2008-02-28 2009-09-02 昆山密友实业有限公司 流体动压型釜用密封机械

Also Published As

Publication number Publication date
DE4026946A1 (de) 1992-02-27
EP0473908A3 (en) 1992-05-20
EP0473908B1 (fr) 1995-03-22
DE59104985D1 (de) 1995-04-27

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