EP0583710B1 - Perceuse à percussion - Google Patents

Perceuse à percussion Download PDF

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Publication number
EP0583710B1
EP0583710B1 EP93112680A EP93112680A EP0583710B1 EP 0583710 B1 EP0583710 B1 EP 0583710B1 EP 93112680 A EP93112680 A EP 93112680A EP 93112680 A EP93112680 A EP 93112680A EP 0583710 B1 EP0583710 B1 EP 0583710B1
Authority
EP
European Patent Office
Prior art keywords
bearing
casing
gear
percussion drill
drill according
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
EP93112680A
Other languages
German (de)
English (en)
Other versions
EP0583710A1 (fr
Inventor
Ulrich Dipl.-Ing. Mütschele
Ulrich Dipl.-Ing. Ranger
Manfred Hellbach
Volker Dipl.-Ing. Biermann
Karsten Blaier
Peter Dipl.-Ing. Wäschle
Gerhard Meixner
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 EP0583710A1 publication Critical patent/EP0583710A1/fr
Application granted granted Critical
Publication of EP0583710B1 publication Critical patent/EP0583710B1/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
    • 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
    • B25D2211/068—Crank-actuated impulse-driving mechanisms

Definitions

  • the invention is based on a rotary hammer according to the preamble of claim 1.
  • DE-A-35 05 544 already discloses such a rotary hammer, which is, however, constructed from a large number of housing parts.
  • a middle housing part On a motor housing, in which a part of the bearings for the drive and gearbox are located, a middle housing part is placed, which has bearings for the rotary and the percussion drive.
  • a third housing part which partially encompasses the striking mechanism and has bearing points for a rotary drive sleeve, is attached to the front.
  • a handle is attached at the back.
  • the large number of housing parts complicates the assembly and has an unfavorable effect on the transmission because the bearing points of the transmission parts are distributed over three housing parts that are not immovable relative to one another.
  • a pure chisel hammer is also known from GB-A-469 926, in which the majority of the necessary bearing points are located in a main housing part. However, the racket is also stored separately in a front housing part. However, this hammer does not have a rotary drive and therefore its internal structure cannot be compared to a rotary hammer.
  • the hammer drill according to the invention with the characterizing features of claim 1 has the advantage that the quality of the storage is improved by placing all bearings in a single bearing housing. Screw connections arranged between several housing parts, which could otherwise loosen themselves, are omitted. In addition to saving weight, the one-piece housing construction also brings greater rigidity to the housing with better handling. Finally, the sealing of the housing is considerably simplified due to the small number of housing joints.
  • the bearing housing can, on the one hand, advantageously be designed in such a way that bearing points lying in the interior of the housing are completely eliminated or such a bearing point is arranged above the drive pinion in such a way that the gears to be inserted can be inserted past it.
  • Figure 1 shows a longitudinal section through a hammer drill according to a first embodiment.
  • Figure 2 shows a second embodiment in longitudinal section and
  • Figure 3 shows a cross section through the housing according to line III-III in Figure 2.
  • a hammer drill 1 has a bearing housing 2, which here also serves as an outer machine housing 2.
  • a tool holder 3 protrudes from the front and a handle 4 is inserted at the rear.
  • the handle 4 is only partially shown.
  • the bearing or machine housing 2 has a mounting opening 6 which can be closed by a cover 7 which is preferably screwed on.
  • a motor housing 8, which accommodates an electric motor 9, is attached to the machine housing 2 from below.
  • the rotor 10 of the motor 9 carries an output pinion 11, which is mounted in a rotor bearing 12 seated in the bearing housing 2.
  • the motor 9 can be inserted into the bearing housing 2 from below, that is to say from the outside.
  • Bearing points 14, 15 for two gearwheels 16, 17 are arranged within the bearing housing 2.
  • the gear wheel 16 has a shaft 18 which is roller-mounted in the bearing 14.
  • a spur toothing 19 which meshes with the driven pinion 11, it also has a bevel gear 20 which meshes with a ring gear 22 in an extension of the shaft 18.
  • the gearwheel 16 forms a rotary drive gear 23 together with the ring gear 22.
  • the ring gear 22 is rotatably mounted on a rotary drive sleeve 24 which is fixedly connected to the tool holder 3 at its front end.
  • the rotary drive sleeve 24 is mounted twice in the bearing housing 2 in a front bearing 25 and a rear bearing 26. It protrudes from a front opening 27 in the bearing housing 2.
  • the bearing point 15 comprises a journal 28 on which the gear 17 is roller-mounted.
  • the gear 17 is integrally connected to an eccentric 29 which surrounds the bearing pin 28 in a pot shape.
  • the eccentric 29 carries an eccentric pin 30 which is arranged eccentrically to the axis of the bearing pin 28 and which is connected to a connecting rod 31 a percussion mechanism 32 known per se is connected.
  • the preferably pneumatic impact mechanism which is not shown in further detail, is located within the rotary drive sleeve 24 and exerts axial impacts on a tool inserted into the tool holder 3.
  • Gear 17, eccentric 29 and connecting rod 31 together form an impact mechanism gear 33.
  • the assembly of the gear parts of the rotary hammer 1 takes place essentially through the assembly opening 6 and through the opening 27.
  • the gears 16 and 17 are pushed along their axial direction assumed in the assembled state through the assembly opening 6 and inserted into the bearing points 14 and 15.
  • the length of the mounting opening 6 is approximately as large as the sum of the diameters of the two gear wheels 16, 17.
  • the width of the mounting opening 6 is also adapted to the diameter of the gear wheels 16, 17.
  • the ring gear 22 is inserted through the mounting opening 6 and held in the end position.
  • the connecting rod 31 of the striking mechanism is then placed on the eccentric pin 30 via the opening 6.
  • the second exemplary embodiment according to FIGS. 2 and 3 differs from the first exemplary embodiment by a bearing seat 140 which is moved to the rear for the rear bearing of the rotary drive sleeve and a modified bearing point 114 for the gear wheel of the rotary drive.
  • a bearing seat 140 which is moved to the rear for the rear bearing of the rotary drive sleeve and a modified bearing point 114 for the gear wheel of the rotary drive.
  • the bearing or machine housing 102 has a stepped bearing 114 for the gear 116.
  • This includes a lower bearing seat 135 and an upper bearing seat 136, which has a larger diameter than the lower bearing seat 135.
  • the lower half of the shaft 118 is surrounded by a radially thin needle bearing 137, while the upper half is seated in a ball bearing 138.
  • a rotary drive sleeve 124 arranged above the gear 116 is held in a front bearing 125 and a rear bearing 126.
  • the rear bearing 126 has as the bearing seat a housing ring 140 which is arranged transversely to the axial direction of the rotary drive sleeve 124 and is integrally connected to the machine housing 102 via ribs 141.
  • the housing ring 140 and the ribs 141 are located in the extension of the output pinion 111 in the middle of the free housing interior.
  • the rear edge 142 of the housing ring 140 lies so far forward that the gear wheel 117 can be plugged behind it from above through the mounting opening 106 onto the bearing pin 128. Since the width of the housing ring 140 is larger than the core diameter of the driven pinion 111, the gear wheel 116 cannot readily be inserted directly vertically into its bearing point 114.
  • the gearwheel 116 is mounted vertically past the housing ring 140 from above at the front through the mounting opening 106, which is slightly longer than in the first exemplary embodiment. If the gear 116 with its shaft 118 abutting the machine housing 102 at the bottom, the spur gear 119 forming the largest diameter of the gear 116 has already passed the housing ring 140. Then the entire gear 116 is horizontally displaced backwards until the axis of the shaft 118 and the central axis of the bearing seat 114 match. Now it can finally be moved down and pressed into the bearing seat. The rest of the assembly of the hammer drill 101 takes place exactly as in the first exemplary embodiment.
  • the rearwardly displaced bearing arrangement for the rotary drive sleeve 124 is particularly advantageous in the case of large rotary hammers if the bearing distance of the rotary drive tube is to be increased due to its size and the increased weight of the striking mechanism 132.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)

Claims (9)

  1. Perceuse à percussion (1, 101), comportant un boîtier de machine (2, 102), un porte-outil (3, 103) dépassant en avant, une poignée (5) disposée en arrière et un moteur (9) de préférence électrique, possédant un rotor (10) du côté du boîtier ainsi qu'un pignon d'attaque (11, 111), le boîtier de machine qui présente une ouverture de montage (6, 106) obturable par un capot (7, 107), contenant l'engrenage (23, 33), l'appareil de frappe (32, 132) et une douille (24, 124) entraînant en rotation le porte-outil (3, 103), caractérisée en ce que le palier (12) du rotor du moteur (9) situé du côté sortie, un engrenage d'entraînement en rotation (23), un engrenage d'entraînement (33) de l'appareil de frappe, l'appareil de frappe lui-même et la douille d'entraînement en rotation (24, 124), peuvent être introduits à l'intérieur d'un boîtier porteur (2, 102) d'une seule pièce pour y être montés exclusivement.
  2. Perceuse à percussion selon la revendication 1, caractérisée en ce que le pignon d'attaque (11, 111) engrène avec deux pignons dentés (16, 116, 17, 117) situés dans un même plan, l'ouverture de montage (6, 106) ayant une longueur correspondant sensiblement à la somme des diamètres des deux pignons (16, 116, 17, 117).
  3. Perceuse à percussion selon la revendication 1 ou 2, caractérisée en ce que le palier arrière (26) de la douille d'entraînement en rotation (24) est situé devant le pignon (16) le plus en avant de l'engrenage (23, 33).
  4. Perceuse à percussion selon l'une quelconque des revendications 1, 2 ou 3, caractérisée en ce que les pignons (16, 116, 17, 117) peuvent être introduits dans le boîtier porteur (2, 102) à travers l'ouverture de montage (6, 106), tandis que le pignon d'attaque (11, 111) du moteur (9) peut être introduit de l'extérieur dans ce boîtier.
  5. Perceuse à percussion selon l'une quelconque des revendications précédentes, caractérisée en ce que le mécanisme (33) d'entraînement de l'appareil de frappe est monté en même temps que le pignon associé (17, 117) dans la même portée de palier (15, 115) du boîtier de machine (2, 102).
  6. Perceuse selon l'une quelconque des revendications précédentes, caractérisée en ce que le boîtier porteur (2) présente, lorsqu'il est vide, un espace libre entre l'ouverture de montage (6) et les portées de palier (14, 15) des pignons dentés (16, 17).
  7. Perceuse à percussion selon l'une quelconque des revendications précédentes 1, 2, 4 ou 5, caractérisée en ce que le boîtier de machine (102) présente, entre l'ouverture de montage (106) et les portées de palier (114, 115) des pignons (116, 117), au-dessus du pignon d'attaque (111), un siège (140), solidaire du boîtier, destiné à recevoir le palier arrière (126) de la douille d'entraînement en rotation (124).
  8. Perceuse à percussion selon la revendication 7, caractérisée en ce qu'au moins l'un des pignons (116, 117) peut être glissé, pour son montage, en dessous du siège de palier (140) perpendiculairement à la direction de son axe.
  9. Perceuse à percussion selon une des revendications 7 et 8, caractérisée en ce que la portée de palier (114) du pignon (116) présente un gradin permettant un déplacement latéral.
EP93112680A 1992-08-18 1993-08-07 Perceuse à percussion Expired - Lifetime EP0583710B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4227288A DE4227288A1 (de) 1992-08-18 1992-08-18 Bohrhammer
DE4227288 1992-08-18

Publications (2)

Publication Number Publication Date
EP0583710A1 EP0583710A1 (fr) 1994-02-23
EP0583710B1 true EP0583710B1 (fr) 1996-03-13

Family

ID=6465787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112680A Expired - Lifetime EP0583710B1 (fr) 1992-08-18 1993-08-07 Perceuse à percussion

Country Status (2)

Country Link
EP (1) EP0583710B1 (fr)
DE (2) DE4227288A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005061399A1 (de) 2005-12-22 2007-07-05 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Meißelhammer
DE102006005852A1 (de) * 2006-02-09 2007-08-23 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Meißelhammer
DE102006061625A1 (de) 2006-12-27 2008-07-03 Robert Bosch Gmbh Elektrohandwerkzeugmaschine
DE102007000827A1 (de) * 2007-10-08 2009-04-09 Hilti Aktiengesellschaft Handwerkzeugmaschine mit einem Kurbelgetriebe
CN201618874U (zh) * 2010-01-21 2010-11-03 浙江海王电器有限公司 电动工具的高低双速旋转与冲击结构
EP3461593A1 (fr) * 2017-09-30 2019-04-03 Positec Power Tools (Suzhou) Co., Ltd Outil de percussion

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR469926A (fr) * 1914-02-02 1914-08-14 Albert Schumacher Train de cylindres pour la fabrication de pièces moulées dans des évidements des cylindres
DE890333C (de) * 1940-06-09 1953-09-17 Siemens Ag Elektrisches Schlagbohrgeraet
AU443662B2 (en) * 1969-01-24 1970-07-30 Hammer drill
DE3311265A1 (de) * 1983-03-28 1984-10-11 Hilti Ag, Schaan Elektropneumatischer bohr- und meisselhammer
DE3538166A1 (de) * 1985-10-26 1987-04-30 Hilti Ag Bohrhammer mit dreharretierung

Also Published As

Publication number Publication date
DE4227288A1 (de) 1994-02-24
DE59301864D1 (de) 1996-04-18
EP0583710A1 (fr) 1994-02-23

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