EP1320446B1 - Machine outil comprenant une chambre a lubrifiant et un dispositif de compensation de pression destine a cette chambre - Google Patents

Machine outil comprenant une chambre a lubrifiant et un dispositif de compensation de pression destine a cette chambre Download PDF

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Publication number
EP1320446B1
EP1320446B1 EP01969266A EP01969266A EP1320446B1 EP 1320446 B1 EP1320446 B1 EP 1320446B1 EP 01969266 A EP01969266 A EP 01969266A EP 01969266 A EP01969266 A EP 01969266A EP 1320446 B1 EP1320446 B1 EP 1320446B1
Authority
EP
European Patent Office
Prior art keywords
bearing
pressure
power tool
tool according
chamber
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
EP01969266A
Other languages
German (de)
English (en)
Other versions
EP1320446A1 (fr
Inventor
Helmut Lebisch
Otto Baumann
Rolf Mueller
Dietmar Saur
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 EP1320446A1 publication Critical patent/EP1320446A1/fr
Application granted granted Critical
Publication of EP1320446B1 publication Critical patent/EP1320446B1/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
    • B25D17/26—Lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/185—Pressure equalising means between sealed chambers

Definitions

  • the invention relates to a machine tool with a space with lubricant and a pressure compensation device of the space according to the preamble of claim 1.
  • the rotary hammer has a arranged in an engine compartment of a housing drive motor with a motor shaft which extends through a housing part into a gear housing and is there via a molded pinion with a gear for driving a tool holder is engaged.
  • the gear compartment is provided with a pressure compensation device, which degrades a pressure occurring in the gear compartment during operation to the atmosphere or the engine compartment.
  • the pressure compensation device has a bore leading from the gear housing to the outside or to the engine compartment and a constantly rotating driven element in the form of a cap in which a passage is introduced.
  • the invention relates to a machine tool, according to the preamble of claim 1 of a hand-held hammer drill, with a space with lubricant and a pressure compensation device of the space in the region of a bearing of a rotationally driven.
  • the rotationally driven component forms a drive or intermediate shaft.
  • a lubricant seal designed as a gap seal, which is arranged between the bearing and a bearing seat, wherein the gap seal can be arranged between an outer ring and / or between an inner ring of the bearing and a bearing seat.
  • the lubricant seal which is simultaneously usable for pressure compensation, is formed by a channel through the bearing, for example, by a channel through a cage of a rolling bearing and / or by bearing washers attached to the bearing.
  • the bearing and the bearing seat made of different materials with different thermal expansion coefficients formed and these are used to produce the lubricant seal, and that is advantageous, the bearing seat made of aluminum or an aluminum alloy and the bearing formed from a steel. If an outer bearing seat is made of a material having a larger coefficient of thermal expansion than the bearing, as is advantageous in the case of an aluminum bearing seat and a steel bearing, the bearing seat expands more when heated, and there is a gap between the bearing and the bearing seat a, which can be used advantageously as a gap seal.
  • an aluminum-steel combination other material combinations that appear appropriate to the person skilled in the art are also conceivable.
  • this is advantageously fixed in the bearing seat in the circumferential direction.
  • This can be achieved by various frictional, positive and / or material connections, for example by a pin connection, a tongue and groove connection and / or a form-locking connection by an outer ring of the bearing has a deviating from a round outer contour outer contour, etc.
  • a pressure equalization channel is introduced in a bearing surface of the bearing and / or in a bearing surface of the bearing seat. It can be structurally simply achieved an advantageous cross section for pressure equalization and at the same time a gap seal and / or labyrinth seal can be realized.
  • the pressure equalization channel can be introduced, for example, in the form of an axial groove in a shaft, in an inner ring of a rolling bearing, an outer ring of a rolling bearing and / or in an outer bearing seat forming component, etc.
  • the pressure equalization channel is at least partially formed by a thread-shaped depression, an advantageous labyrinth effect or labyrinth seal can be achieved and, moreover, a return effect can be achieved, namely by matching the thread direction and direction of rotation accordingly.
  • the thread-like depression can in turn be introduced into the bearing and / or into a bearing seat. If the pressure equalization channel opens into at least one annular groove, this can be produced in a particularly simple and cost-effective manner, for example in a turning process, starting from a first annular groove and opening into a second annular groove.
  • a filter element is connected in series with the lubricant seal formed at least partially by the bearing. At the same time ensuring the pressure compensation function, the sealing effect can be improved.
  • a filter element is particularly suitable a felt seal, which is particularly inexpensive to produce and has advantageous, proven properties.
  • the felt element can by different, The fibrous materials appear to be useful to those skilled in the art, such as in particular from animal hair, vegetable fibers and / or synthetic fibers, etc.
  • the filter element is advantageously fixed in its position by a component which fixes a bearing.
  • an advantageously large filter volume can be achieved by branching off from the bearing at least two radial pressure equalization channels, in particular by the bearing is surrounded by an annular filter element, and the pressure equalization channels open from the bearing radially outward on the filter element.
  • the solution according to the invention can be used in all machine tools that appear appropriate to a person skilled in the art, in particular in handheld power tools, such as, for example, grinding machines, saws, milling machines, planers, drills, chisel hammers, etc.
  • Fig. 1 shows a drill hammer shown schematically with a housing 104 in which in a motor space 56, a drive motor 58 is mounted.
  • a tool holder 60 and a drill 62 fixed in the tool holder 60 can be driven in rotation and in a hammering manner by way of a gear unit 10, which is not shown in more detail.
  • the hammer drill can be guided with two, 64 extending substantially perpendicular to an actuating direction handles 64, 66, wherein a handle 64 is formed on a side facing away from the drill bit 62 to the housing 104, and a handle 66 on a drill 62 facing side is attached to the housing 104.
  • the drive motor 58 has a drive shaft 68, on which in the engine compartment 56, a fan 80 is arranged rotationally fixed ( Fig. 2 ).
  • the drive shaft 68 protrudes from the engine compartment 56 through an intermediate wall 70 made of aluminum in the gear chamber 10 and is rotatably mounted in the intermediate wall 70 in a ball bearing 48.
  • the ball bearing 48 is connected with its outer ring 72 via a press fit with the intermediate wall 70 and is rotatably connected with its inner ring 74 via a press fit with the drive shaft 68.
  • the ball bearing 48 is designed as a fixed bearing, and this is supported axially in the direction of the gear housing 10 at a shoulder 78 in the intermediate wall 70 and axially toward the engine compartment 56 to a retaining wall 32 fixed in the intermediate wall 70.
  • the lubricant-filled gear chamber 10 is sealed at the ball bearing 48 via a sealing washer 76 in the direction of the engine compartment 56 air and lubricant tight.
  • a pinion 82 is formed, with which the drive shaft 68 with a rotatably mounted on an intermediate shaft 20 of the transmission, not shown gear meshes.
  • the intermediate shaft 20 is rotatably supported by a ball bearing 16 in the intermediate wall 70.
  • the ball bearing 16 is designed as a fixed bearing, and this is supported axially towards the engine compartment 56 at a shoulder 88 in the intermediate wall 70 and axially in weight gear chamber 10 via a non-illustrated, fixed in the intermediate wall 70 holding member.
  • the ball bearing 16 forms part of a lubricant seal 24 of a pressure compensation device 12, via which the pressure in the gear chamber 10 compensated or a pressure build-up in the gear chamber 10 during operation of the hammer drill can be reliably avoided by heating.
  • the ball bearing 16 is rotationally fixed with its inner ring 84 via a press fit connected to the intermediate shaft 20. Furthermore, the ball bearing 16 is introduced with its outer ring 86 made of steel via a sliding fit into a bearing seat 28 formed by the intermediate wall 70. If the hammer drill is operated, the ball bearing 16 and the intermediate wall 70 is heated. Due to their different thermal expansion coefficients, the intermediate wall 70 made of aluminum expands more than the ball bearing 16 made of steel.
  • a bearing gap between the inner ring 84 and the outer ring 86 of the ball bearing 16 is sealed by a sealing ring 90 air and lubricant tight.
  • a filter element 46 formed by a felt ring is connected in series.
  • the filter element 46 is inserted into a recess 94 surrounding the ball bearing 48 of the intermediate wall 70 and is held by the retaining ring 32 in its position.
  • a bore 92 is coaxially inserted to the intermediate shaft 20, which conceals in the direction of the engine compartment 56 from the filter element 46 is and over the pressure difference between the gear chamber 10 and the engine compartment 56 can be compensated.
  • FIG. 3 is a variant too Fig. 2 shown with a pressure compensation device 14.
  • Fig. 3 is a variant too Fig. 2 shown with a pressure compensation device 14.
  • Essentially identical components are numbered in the illustrated embodiments in principle with the same reference numerals.
  • a drive shaft 22 of a drive motor 58 is mounted via a ball bearing 18 in an intermediate wall 106.
  • the ball bearing 18 according to the invention forms part of a lubricant seal 26 of the pressure compensation device 14, via which the pressure in a gear chamber 10 can be compensated.
  • the ball bearing 18 is rotatably connected with its inner ring 96 via a press fit with the drive shaft 22.
  • the ball bearing 18 is introduced with its outer ring 98 made of steel via a sliding fit into a bearing seat 30 formed by the intermediate wall 106.
  • the ball bearing 18 and the intermediate wall 106 are heated. Due to their different coefficients of thermal expansion, the intermediate wall 106 of aluminum expands more than the steel ball bearing 18.
  • a felt ring filter element 46 To the adjusting between the outer ring 98 and the intermediate wall 106 gap seal formed by a felt ring filter element 46 is connected in series.
  • the filter element 46 is inserted into a recess 94 surrounding the ball bearing 18 in the intermediate wall 106 and is held in its position by the retaining ring 32. From the outer ring 98 of the ball bearing 18 extend four uniformly distributed over the circumference, introduced into the intermediate wall 106 radial pressure equalization channels 50, 52 which open radially outward on the filter element 46.
  • An intermediate shaft 20 of a transmission in the transmission 10 not shown in detail is mounted on a ball bearing 100 in the intermediate wall 106.
  • the intermediate wall 106 is sealed in the region of the ball bearing 100 from the gear chamber 10 in the direction of the engine compartment 56.
  • an intermediate shaft 54 is rotatably supported via a ball bearing 36 in an intermediate wall 70.
  • the ball bearing 36 according to the invention forms part of a lubricant seal 38 of a pressure compensation device 34, over which the pressure in a gear chamber 10 can be compensated.
  • the ball bearing 36 is arranged with its inner ring 84 via a press fit on a bearing seat 40 of the intermediate shaft 54 rotatably. Further, the ball bearing 36 is introduced with its outer ring 86 made of steel via a press fit in a bearing seat 102 formed by the intermediate wall 70.
  • a pressure equalization channel 42 formed by a thread-shaped depression is introduced, which opens into an annular groove 44 counter to a venting direction of the gear chamber 10.
  • the pressure compensation channel 42 forms a labyrinth seal and also has a return effect of the lubricant during operation.
  • a bearing gap between the inner ring 84 and the outer ring 86 of the ball bearing 36 is sealed by a sealing ring 90 air and lubricant tight.

Landscapes

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

Abstract

La présente invention concerne une machine outil, notamment un marteau perforateur manuel, comprenant une chambre (10) à lubrifiant et un dispositif de compensation de pression (12, 14, 34), qui est destiné à la chambre (10) et se trouve dans la zone d'un support (16, 18, 36) pour un composant pouvant être entraîné en rotation (20, 22, 54). Selon cette invention, le support (16, 18, 36) constitue au moins une partie d'un joint à lubrifiant (24, 26, 38) du dispositif de compensation de pression (12, 14, 34), qui permet de compenser une pression dans la chambre (10).

Claims (11)

  1. Machine-outil, notamment perceuse manuelle, comprenant une chambre (10) avec du lubrifiant et un dispositif de compensation de la pression (12, 14, 34) pour la chambre (10) dans la région d'un palier (16, 18, 36) d'un composant pouvant être entraîné en rotation, le palier (16, 18, 36) formant au moins une partie d'un joint d'étanchéité pour lubrifiant (24, 26, 38) du dispositif de compensation de la pression (12, 14, 34) par le biais duquel une pression dans la chambre (10) peut être compensée, caractérisée en ce que le composant pouvant être entraîné en rotation est constitué par un arbre d'entraînement ou un arbre intermédiaire (20, 22, 54).
  2. Machine-outil selon la revendication 1, caractérisée en ce que le joint d'étanchéité pour lubrifiant (24, 26) est réalisé sous forme de joint d'étanchéité d'interstice et est disposé entre le palier (16, 18) et un siège de palier (28, 30).
  3. Machine-outil selon la revendication 2, caractérisée en ce que le palier (16, 18) et le siège de palier (28, 30) se composent de différents matériaux avec différents coefficients de dilatation thermique, et ceux-ci sont utilisés pour produire le joint d'étanchéité pour lubrifiant (24, 26).
  4. Machine-outil selon la revendication 3, caractérisée en ce que le palier (16, 18) est réalisé sous forme de palier fixe et un composant (32) fixant le palier (16, 18) dans la direction axiale est utilisé pour fixer le palier (16, 18) dans la direction périphérique.
  5. Machine-outil selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un canal de compensation de la pression (42) est pratiqué dans une surface de palier du palier et/ou dans une surface de palier du siège de palier (40).
  6. Machine-outil selon la revendication 5, caractérisée en ce que le canal de compensation de la pression (42) est formé au moins en partie par un renfoncement en forme de filet.
  7. Machine-outil selon la revendication 6, caractérisée en ce que le canal de compensation de la pression (42) débouche dans au moins une rainure annulaire (44).
  8. Machine-outil selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un élément de filtre (46) est monté en série avec le joint d'étanchéité pour lubrifiant (24, 26, 38) formé au moins en partie par le palier (16, 18, 36).
  9. Machine-outil selon la revendication 8, caractérisée en ce que l'élément de filtre (46) est fixé en position par un composant (32) fixant un palier (18, 48).
  10. Machine-outil selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins deux canaux radiaux de compensation de la pression (50, 52) partent du palier (18).
  11. Machine-outil selon la revendication 8 ou 9 et 10, caractérisée en ce que le palier (18) est entouré par un élément de filtre annulaire (46) et les canaux de compensation de la pression (50, 52) débouchent depuis le palier (18) radialement vers l'extérieur au niveau de l'élément de filtre (46).
EP01969266A 2000-09-15 2001-08-31 Machine outil comprenant une chambre a lubrifiant et un dispositif de compensation de pression destine a cette chambre Expired - Lifetime EP1320446B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10045618A DE10045618A1 (de) 2000-09-15 2000-09-15 Werkzeugmaschine mit einem Raum mit Schmiermittel und einer Druckausgleichseinrichtung des Raums
DE10045618 2000-09-15
PCT/DE2001/003358 WO2002022315A1 (fr) 2000-09-15 2001-08-31 Machine outil comprenant une chambre a lubrifiant et un dispositif de compensation de pression destine a cette chambre

Publications (2)

Publication Number Publication Date
EP1320446A1 EP1320446A1 (fr) 2003-06-25
EP1320446B1 true EP1320446B1 (fr) 2009-02-11

Family

ID=7656283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01969266A Expired - Lifetime EP1320446B1 (fr) 2000-09-15 2001-08-31 Machine outil comprenant une chambre a lubrifiant et un dispositif de compensation de pression destine a cette chambre

Country Status (5)

Country Link
US (1) US6722449B2 (fr)
EP (1) EP1320446B1 (fr)
JP (1) JP2004508948A (fr)
DE (2) DE10045618A1 (fr)
WO (1) WO2002022315A1 (fr)

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JP4461062B2 (ja) * 2005-06-02 2010-05-12 株式会社マキタ 作業工具
DE602006005101D1 (de) * 2005-06-02 2009-03-26 Makita Corp Kraftwerkzeug
AU2007202970A1 (en) * 2006-07-01 2008-01-17 Black & Decker, Inc. Beat piece support structure for a hammer drill
DE102006054288A1 (de) * 2006-11-17 2008-05-21 A & M Electric Tools Gmbh Bohrhammer
DE102007050549A1 (de) 2007-10-23 2009-04-30 Robert Bosch Gmbh Handwerkzeugmaschine
US8813868B2 (en) * 2008-05-09 2014-08-26 Milwaukee Electric Tool Corporation Auxiliary handle for use with a power tool
US9776296B2 (en) 2008-05-09 2017-10-03 Milwaukee Electric Tool Corporation Power tool dust collector
DE102008054978A1 (de) * 2008-12-19 2010-06-24 Robert Bosch Gmbh Elektrohandwerkzeug, insbesondere Bohr- und/oder Schlaghammer
DE102009001657A1 (de) * 2009-03-19 2010-09-23 Robert Bosch Gmbh Handwerkzeugmaschine
CN102476222B (zh) * 2010-11-24 2014-12-10 南京德朔实业有限公司 用于振荡工具上的开孔器
US9486908B2 (en) 2013-06-18 2016-11-08 Ingersoll-Rand Company Rotary impact tool
US11084006B2 (en) 2017-03-23 2021-08-10 Milwaukee Electric Tool Corporation Mud mixer
US11865688B2 (en) * 2021-02-15 2024-01-09 Makita Corporation Impact tool

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Also Published As

Publication number Publication date
DE10045618A1 (de) 2002-04-04
JP2004508948A (ja) 2004-03-25
DE50114703D1 (de) 2009-03-26
WO2002022315A1 (fr) 2002-03-21
EP1320446A1 (fr) 2003-06-25
US20030121683A1 (en) 2003-07-03
US6722449B2 (en) 2004-04-20

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