EP3221091B1 - Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle - Google Patents

Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle Download PDF

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Publication number
EP3221091B1
EP3221091B1 EP15798073.1A EP15798073A EP3221091B1 EP 3221091 B1 EP3221091 B1 EP 3221091B1 EP 15798073 A EP15798073 A EP 15798073A EP 3221091 B1 EP3221091 B1 EP 3221091B1
Authority
EP
European Patent Office
Prior art keywords
gear
hand
closure
held tool
pressure valve
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.)
Active
Application number
EP15798073.1A
Other languages
German (de)
English (en)
Other versions
EP3221091A1 (fr
Inventor
Oliver Ohlendorf
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 EP3221091A1 publication Critical patent/EP3221091A1/fr
Application granted granted Critical
Publication of EP3221091B1 publication Critical patent/EP3221091B1/fr
Active 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
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • 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

  • Hand tool gear locks and hand tools are known from the prior art, as in EP2433755A1 or US4165816A shown.
  • the present invention relates to a hand tool gear lock with a base body for closing a gear housing opening of a gear housing of a hand power tool, in particular a rotary hammer or combination hammer.
  • the present invention also relates to a hand-held power tool with a hand-held tool gear lock.
  • a percussion mechanism with a piston, connecting rod and a snap die can be arranged inside the transmission housing of a typical hand-held power tool. These are lubricated by a lubricant located in the transmission housing, for example transmission oil, in order to interact with as little friction as possible. Typically, the lubricant is introduced into the gear case through the gear case opening. In order to prevent the lubricant from escaping from the transmission housing, the transmission housing opening is closed by a main body of a hand tool transmission closure. The base body can be designed as a plug.
  • the object is achieved in that the hand tool gear lock has an air duct through which air can flow into and out of the gear duct and the hand tool gear lock has a pressure valve which is arranged in the air duct and via which an overpressure occurring in the gear housing can be reduced.
  • a negative pressure occurring in the transmission housing can preferably be compensated via the pressure valve.
  • air that is expanded due to the operation of the machine tool and specifically due to the heating of the lubricant located in the transmission housing can now escape from the transmission housing.
  • the invention includes the finding that the closed design of a transmission housing and its closure by means of a base body without an air duct Internal pressure of a gear housing increases during operation of the machine tool to an undesirably high pressure level.
  • a high pressure level is detrimental to the service life and in particular also to the work performance data, for example the impact energy emitted by the hand-held power tool.
  • the hand tool lock according to the invention helps to eliminate these disadvantages by being able to regulate the internal pressure of the transmission.
  • the pressure valve is arranged within the hand tool gear lock and is designed as an elastic hose element. According to the invention, a reduction in an overpressure occurring in the transmission housing is accompanied by an elastic deformation of the elastic hose element.
  • the pressure valve designed as an elastic hose element can be installed in the hand tool gear lock in a prestressed state.
  • the pressure valve designed as an elastic tube element is advantageously made of silicone.
  • the pressure valve can be designed in such a way that it only opens when a predetermined pressure difference, for example 2 bar, between the ambient pressure and the transmission pressure is exceeded. This is advantageous, for example, if the machine tool has an electropneumatic percussion mechanism for which a target overpressure is desirable.
  • the hand tool gear lock has a cover part with ventilation openings.
  • the cover part preferably protrudes into the base body, with the pressure valve designed as an elastic hose element being supported both against the base body and against the cover.
  • the hand tool gear lock has an air-permeable and in particular essentially gear oil-tight sealing element.
  • the sealing element is preferably arranged in the air duct.
  • a lubricant in particular oil
  • An air-permeable and gear oil-tight sealing element allows pressure equalization on the one hand and prevents oil from escaping from the gear housing on the other.
  • the sealing element consists of felt or at least has felt.
  • the sealing element can consist of a dense textile fiber material. It has proven to be further advantageous if the sealing element at least is arranged in sections below the pressure valve when the hand tool gear lock is in its intended installation situation.
  • the base body and/or the cover part is/are preferably designed to be rotationally symmetrical. In this way, cost-effective production on a lathe is possible.
  • the ventilation openings are preferably arranged in a ring shape on a surface of the cover part.
  • the base body has a trough-shaped section which is preferably arranged opposite the cover part and more preferably protrudes into the transmission housing when the base body closes the transmission housing opening.
  • the trough-shaped section of the base body can have an opening bore through which a quantity of air can enter or exit the air duct.
  • the trough-shaped section of the base body can be rotationally symmetrical.
  • the opening bore is preferably designed as a through bore along a secant of the rotationally symmetrical trough-shaped section of the base body.
  • the base body has a sealing ring which is arranged to seal off the base body from the transmission housing opening on the peripheral side.
  • the base body is preferably designed as a plug.
  • a plug function of the base body can be brought about, for example, by a sealing ring provided on the base body.
  • the base body can have lamellae which are designed to hold the base body in a force-fitting manner in a transmission housing opening.
  • the object is achieved in that the hand-held power tool has a hand-held tool gear lock as described above.
  • a hand tool gear lock 10 according to the invention is shown in different views. While showing Fig. 1a , Schematically, a side view of the rotationally symmetrical hand tool gear lock 10 with section line AA shown. Fig. 1b shows the section AA through the hand tool gear lock 10 according to the section line AA Fig. 1a . In 1c is again an exploded view of the hand tool gear lock 10 is shown.
  • the hand tool gear lock 10 in 1 has a base body 1 for closing a gear housing opening 70 of a gear housing 80 .
  • the hand tool transmission lock 10 also has an air duct L through which a mass of air (not shown) can flow into and out of the transmission housing for the purpose of pressure equalization.
  • a pressure valve 3 is arranged in the air duct L of the hand tool gear lock 10, via which an overpressure or negative pressure in the gear housing 80 can be reduced.
  • the pressure valve 3 is arranged inside the hand tool gear lock 10 and is designed as an elastic hose element made of silicone.
  • the pressure valve 3 designed as an elastic hose element is arranged coaxially to the basic body 1 of the hand tool gear lock 10 which is designed to be rotationally symmetrical.
  • the hand tool gear lock 10 has a cover part 2, which has a ventilation opening 2' on its surface.
  • the ventilation opening 2 ' In the sectional view of the Fig. 1b ) is the ventilation opening 2 'not visible, it is explained with reference to the other figures.
  • the cover part 2 which is also designed to be rotationally symmetrical, protrudes into the base body 1 .
  • the pressure valve 3 designed as an elastic hose element is supported both against the base body 1 and against the cover part 2 and is installed in the hand tool gear lock 10 in a pretensioned state.
  • a sealing element 8 is arranged coaxially to the pressure valve 3 and is made of felt in the present case and is rotationally symmetrical.
  • the air-permeable and essentially gear oil-tight sealing element 8 is arranged flush with the pressure valve 3 on its lower side. Due to the air-permeable and gear oil-tight sealing element 8, on the one hand a pressure equalization can take place, and on the other hand, an escape of oil, for example in the form of oil vapor, from the transmission housing 80 is avoided.
  • the hand tool gear lock 10 has a sealing ring 6 which is arranged to seal the base body 1 on the circumference to the gear housing opening 70 shown.
  • FIG. 2 shows the hand tool transmission closure 10 in the state that the pressure valve 3 assumes when the internal transmission pressure DI and the ambient pressure DU are essentially the same. This is the case, for example, when the hand-held power tool has not been in operation for a long period of time or during operation of the hand-held power tool when pressure equalization has already taken place.
  • the base body 1 has a trough-shaped section 1' in which an opening bore 1" is arranged. This opening bore 1" also forms an entry for the air duct L of the hand tool gear lock, with the air duct L extending through the hand tool gear lock 10 to the ventilation opening 2' extends in the cover part 2.
  • the prestressed pressure valve 3 installed in the hand tool gear lock 10 and designed as an elastic hose element is pressed against a valve seat 3 ′, which is part of the cover part 2 on the one hand and part of the base body 1 on the other.
  • Ventilation openings 2 'of the cover part 2 Due to the in 2 selected sectional view of the hand tool gear lock 10, two of the ventilation openings 2 'of the cover part 2 can be seen.
  • Other ventilation openings 2 ', which are arranged in a ring on the surface of the cover part, are for example 4 removable.
  • the pressure valve 3 now shows the same hand tool gear lock 10 as 2 , where in 3 the state that the pressure valve 3 assumes when the transmission pressure DI exceeds the ambient pressure DU is shown, ie there is an overpressure in the transmission housing 80 .
  • This is the case, for example, when the percussion mechanism (not shown) has heated a lubricant located in the transmission housing 80 .
  • the pressure valve 3 is designed in such a way that it only opens when a predetermined pressure difference of 2 bar between the ambient pressure DU and the transmission pressure DI is exceeded in order to achieve a target overpressure in the transmission housing 80, i.e. the pressure valve 3 only opens when the transmission pressure DI exceeds the ambient pressure DU exceeded by 2 bar.
  • the air duct L which extends through the hand tool transmission lock 10, is explained in more detail. Beginning in the opening bore 1", the air duct L extends through the trough-shaped section 1' of the base body 1 in the direction of the centrally arranged sealing element 8. From there, the air duct L branches into an annular duct section which leads to the pressure valve 3 According to the invention, the pressure valve 3 is arranged within the air duct L of the hand tool gear lock 10.
  • the ventilation openings 2' of the cover part 2 adjoin the pressure valve 3 and in turn form sections of the air duct L of the hand tool gear lock 10.
  • the air duct L ends with ventilation openings 2' of the cover part 2.
  • An air mass LM is shown as an example by means of a dashed line, which due to the internal transmission pressure DI, which is greater than the ambient pressure DU, moves in the direction of the arrow through the air duct L of the hand tool transmission lock 10 and out of the transmission housing 80 .
  • the air mass LM first passes through the opening hole 1" in order to subsequently pass through the airtight and essentially transmission oil-tight sealing element 8. Lubricants or oil residues previously in the air mass LM are held back by the sealing element 8 and cannot escape from the Step out hand tool gear lock 10.
  • the air mass LM moves in the direction of the pressure valve 3, which is designed as an elastic hose element, whereby this - it is installed in a prestressed state - is pressed to the outside of the base body 1 with further elastic deformation, i.e. as in 3 shown from the part of the valve seat 3 ', which is covered by the cover part 2.
  • the air mass LM can escape through the ventilation openings 2 ′ of the cover part 2 from the hand tool gear lock 10 in accordance with the direction of the arrow of the dashed line.
  • the pressure valve 3 After pressure equalization, the pressure valve 3 returns to its in 2 shown starting position.
  • FIG. 4 shows the hand tool gear lock 10 in a schematic and perspective view.
  • the rotationally symmetrical design of the base body 1 with its trough-shaped section 1' and the rotationally symmetrical design of the cover part 2, on the surface of which five ventilation openings 2' are arranged in a ring, are clearly visible.
  • a percussion mechanism 60 facing side of the trough-shaped section 1 'of the base body 1 is the opening bore 1 "arranged through which an air mass LM in the air duct L of the Hand tool transmission lock 10 (in the case of overpressure reduction) can occur or (in the case of negative pressure compensation) can escape.
  • a hand tool 100 according to the invention with a hand tool gear lock 10 is in figure 5 shown.
  • the hand-held power tool 100 has a housing 90 which encloses a gear housing 80 .
  • An impact mechanism 60 is arranged inside the transmission housing 80 and develops heat during the operation of the hand-held power tool 100 .
  • a transmission housing opening 70 is arranged on the upper side of the transmission housing 80 and is closed by a hand tool transmission closure 10 in the present case.
  • the hand tool gear lock 10 is covered by an oscillating plate 50 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (9)

  1. Fermeture de transmission d'outil à main (10) comprenant un corps de base (1) pour fermer une ouverture de carter de transmission (70) d'un carter de transmission (80) d'une machine-outil à main (100), notamment d'un marteau perforateur ou d'un marteau combiné,
    la fermeture de transmission d'outil à main (10) présentant un canal d'air (L), à travers lequel une masse d'air (LM) peut s'écouler dans et hors du carter de transmission (80) et la fermeture de transmission d'outil à main (10) présentant une soupape de pression (3) agencée dans le canal d'air (L), par l'intermédiaire de laquelle une surpression se produisant dans le carter de transmission (80) peut être supprimée,
    caractérisée en ce que la soupape de pression (3) est agencée à l'intérieur de la fermeture de transmission d'outil à main (10) et est configurée sous forme d'élément de tuyau élastique, une suppression d'une surpression se produisant dans le carter de transmission (80) s'accompagnant d'une déformation élastique de l'élément de tuyau.
  2. Fermeture de transmission d'outil à main (10) selon la revendication 1,
    caractérisée en ce que la soupape de pression (3) configurée sous forme d'élément de tuyau élastique est installée dans un état précontraint.
  3. Fermeture de transmission d'outil à main (10) selon la revendication 1 ou 2,
    caractérisée en ce que la fermeture de transmission d'outil à main (10) présente une partie de couvercle (2) avec des ouvertures d'aération (2'), qui fait saillie dans le corps de base (1), la soupape de pression (3) configurée sous forme d'élément de tuyau élastique s'appuyant aussi bien contre le corps de base que contre la partie de couvercle (2).
  4. Fermeture de transmission d'outil à main (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce qu'une dépression se produisant dans le carter de transmission (80) peut être compensée par la soupape de pression (3).
  5. Fermeture de transmission d'outil à main (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que la fermeture de transmission d'outil à main (10) présente un élément d'étanchéité (8) perméable à l'air et étanche à l'huile de transmission, qui est agencé dans le canal d'air (L) et est de préférence agencé coaxialement à la soupape de pression (3).
  6. Fermeture de transmission d'outil à main (10) selon la revendication 5,
    caractérisée en ce que l'élément d'étanchéité est constitué de feutre ou présente au moins du feutre.
  7. Fermeture de transmission d'outil à main (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que le corps de base (1) présente une bague d'étanchéité (6), qui est agencée de manière à étanchéifier le corps de base (1) du côté périphérique par rapport à l'ouverture de carter de transmission (70).
  8. Fermeture de transmission d'outil à main (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que le corps de base (1) est configuré sous forme de bouchon.
  9. Machine-outil à main (100), notamment marteau perforateur ou marteau combiné, comprenant un carter de transmission (80) entouré d'un carter d'outil (90), qui est accessible par l'intermédiaire d'une ouverture de carter de transmission (70),
    caractérisée en ce que la machine-outil à main (100) présente une fermeture de transmission d'outil à main (10) selon l'une quelconque des revendications précédentes.
EP15798073.1A 2014-11-21 2015-11-20 Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle Active EP3221091B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14194231.8A EP3023204A1 (fr) 2014-11-21 2014-11-21 Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle
PCT/EP2015/077204 WO2016079289A1 (fr) 2014-11-21 2015-11-20 Moyen de fermeture de transmission d'outillage à main et machine-outil portative

Publications (2)

Publication Number Publication Date
EP3221091A1 EP3221091A1 (fr) 2017-09-27
EP3221091B1 true EP3221091B1 (fr) 2022-07-13

Family

ID=52000642

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14194231.8A Withdrawn EP3023204A1 (fr) 2014-11-21 2014-11-21 Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle
EP15798073.1A Active EP3221091B1 (fr) 2014-11-21 2015-11-20 Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14194231.8A Withdrawn EP3023204A1 (fr) 2014-11-21 2014-11-21 Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle

Country Status (4)

Country Link
US (1) US20170341214A1 (fr)
EP (2) EP3023204A1 (fr)
CN (1) CN107000195B (fr)
WO (1) WO2016079289A1 (fr)

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923306A (en) * 1957-01-07 1960-02-02 Thor Power Tool Co Pressure regulator valve mechanism for air tools
US3920088A (en) * 1973-11-23 1975-11-18 Thor Power Tool Co Power tool with continuous and pulsating torque output cycle
US4165816A (en) * 1978-04-10 1979-08-28 Dapco Industries Vent cap
DE3328953A1 (de) * 1983-08-11 1985-02-21 Jacob Berg Kg, 6501 Budenheim Behaelterverschluss zum be- oder entlueften eines behaelters
US5125428A (en) * 1988-07-21 1992-06-30 Zahnradfabrik Friedrichshafen Ag Device for equalizing pressure between machine housing and the surroundings
US4987740A (en) * 1989-04-03 1991-01-29 General Motors Corporation Assured venting master cylinder diaphragm apparatus and method
DE4224497A1 (de) * 1992-07-24 1994-01-27 Hilti Ag Mundstück für Auspressgeräte, die dem Abgeben von Zweikomponentenmassen dienen
DE4300441C1 (de) * 1993-01-09 1993-12-02 Inst Maschinenelemente Uni Stu Vorrichtung zum Ent- und Belüften von Maschinengehäusen
US5522769A (en) * 1994-11-17 1996-06-04 W. L. Gore & Associates, Inc. Gas-permeable, liquid-impermeable vent cover
JP3431497B2 (ja) * 1998-05-13 2003-07-28 株式会社マキタ 電動工具のシール機構
GR2002256Y (en) * 1998-06-25 2000-07-04 Argo Aeve Liquid-impermeable and air-permeable caps
DE10145464C2 (de) * 2001-09-14 2003-08-28 Wacker Construction Equipment Bohr- und/oder Schlaghammer mit anpressdruckabhängiger Leerlaufsteuerung
DE10145296A1 (de) * 2001-09-14 2003-04-03 Bosch Gmbh Robert Handwerkzeugmaschine mit einer Druckausgleichseinrichtung
US7886928B2 (en) * 2006-04-28 2011-02-15 Silgan Plastics Corporation Container with venting closure assembly
DE102007000216B4 (de) * 2007-04-11 2022-10-27 Hilti Aktiengesellschaft Elektrische Hubsäge
EP2366513B1 (fr) * 2008-12-16 2015-08-05 Positec Power Tools (Suzhou) Co., Ltd Scie à chaîne
JP5486214B2 (ja) * 2009-05-20 2014-05-07 株式会社マキタ 動力工具
EP3023354A1 (fr) * 2014-11-21 2016-05-25 HILTI Aktiengesellschaft Fermeture d'entraînement de machine-outil manuelle et machine-outil manuelle
US10371246B2 (en) * 2016-03-24 2019-08-06 Fca Us Llc Breather vent assembly for a vehicle transmission

Also Published As

Publication number Publication date
US20170341214A1 (en) 2017-11-30
WO2016079289A1 (fr) 2016-05-26
EP3221091A1 (fr) 2017-09-27
EP3023204A1 (fr) 2016-05-25
CN107000195A (zh) 2017-08-01
CN107000195B (zh) 2020-02-21

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