US20030000715A1 - Hand-held machine tool comprising a sealing ring disposed in the tool holder - Google Patents

Hand-held machine tool comprising a sealing ring disposed in the tool holder Download PDF

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Publication number
US20030000715A1
US20030000715A1 US10/168,916 US16891602A US2003000715A1 US 20030000715 A1 US20030000715 A1 US 20030000715A1 US 16891602 A US16891602 A US 16891602A US 2003000715 A1 US2003000715 A1 US 2003000715A1
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US
United States
Prior art keywords
sealing ring
sealing
tool holder
percussion bolt
tool
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.)
Abandoned
Application number
US10/168,916
Inventor
Andre Ullrich
Juergen Schlipf
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20030000715A1 publication Critical patent/US20030000715A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • 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
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • 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
    • B25D2250/365—Use of seals

Definitions

  • the current invention relates to a hand power tool with a tool holder, which can be driven in a rotary and percussive fashion and in which a percussion bolt is supported so that it can move axially, in which the tool holder contains at least one sealing ring that encompasses the percussion bolt.
  • the percussion bolt moves in the axial direction, for example with a frequency of 65 to 85 Hz and an amplitude of 1 to 10 mm.
  • the percussion bolt also moves in the radial direction depending on component tolerances and a thermal expansion of the materials.
  • a seal inserted between the percussion bolt and the tool holder experiences a relatively high amount of wear.
  • the object of the invention therefore, is to produce a sealing ring, which experiences the least amount of wear possible due to the motion of the percussion bolt and therefore assures a high degree of impermeability over a long operation time of the machine tool.
  • the sealing ring has a number of sealing lips that rest against the percussion bolt and that at least on its lateral flank oriented toward the machine, the sealing ring is provided with one or more radially extending recesses.
  • This particular formation of the sealing ring lends the sealing lips a very high degree of flexibility so that they can easily follow the axial and radial movements and the thermal expansion of the material without a large amount of wear and consequently produce a reliable sealing of the percussion bolt in the tool holder.
  • the lateral flank of the sealing ring oriented toward the tool is also provided with one or more radially extending recesses, this also lends the sealing lip oriented toward the tool a high degree of flexibility, allowing it to easily follow the axial and radial movements of the percussion bolt as well as thermal expansions of the material and consequently produces an effective seal of the transmission chamber of the machine tool against penetration of dust through the tool holder.
  • the sealing ring preferably has a cross-sectional form that is symmetrical with regard to a radial central plane thus preventing a laterally reversed insertion of the sealing ring.
  • a favorable adhesion of the sealing ring in the tool holder is achieved by virtue of the fact that the sealing ring is fitted with its side oriented away from the percussion bolt into a radially extending groove in the tool holder.
  • FIG. 1 The sole FIGURE of the drawing shows a longitudinal section through the front part of a rotating and hammering hand power tool, namely a percussive drill or a hammer drill. Freed of all parts of the hand power tool that are unnecessary for the explanation of the invention, the drawing shows a tool holder 1 with a receiving bore 2 for a tool, for example a drill bit, a chisel, or the like.
  • This tool holder transmits a rotary motion from a drive mechanism that is not shown to a tool that is inserted into it.
  • a percussion bolt 3 is supported so that it can move axially in the tool holder 1 .
  • a drive mechanism moves this percussion bolt 3 back and forth axially in the tool holder 1 with a frequency of 65 to 85 Hz and an amplitude of 1 to 10 mm and transfers this motion to a tool inserted into the tool holder 1 .
  • a sealing ring 5 which encompasses the percussion bolt 3 , is inserted into an annular groove 4 on the inside of the tool holder 1 .
  • the purpose of this sealing ring 5 on the one hand is to prevent an escape of lubricant (grease or oil) from the transmission chamber of the machine tool into the tool holder 1 and on the other hand to prevent the penetration of dust from the tool holder 1 into the transmission chamber. Fulfilling these high sealing requirements for the longest possible operating time of the machine tool is problematic because the percussion bolt 3 encompassed by the sealing ring 5 moves not only in the axial direction, but also moves in the radial direction due to component tolerances and thermal expansion of the materials.
  • the sealing ring 5 has two parallel sealing lips 6 and 7 in the axial direction of the percussion bolt 3 .
  • the sealing lip 6 oriented toward the interior of the machine seals the transmission chamber against the escape of lubricant and the sealing lip 7 oriented toward the tool produces a seal preventing the penetration of dust from the tool holder 1 .
  • the sealing ring 5 is thus formed so that separate sealing lips 6 and 7 perform the two sealing functions.
  • the sealing ring 5 can also have more than two sealing lips.
  • a rapid wear of the sealing ring 5 and therefore a loss of sealing action can be counteracted by giving the sealing lips 6 and 7 a high degree of flexibility so that they can easily follow the axial and radial movements of the percussion bolt 3 .
  • a high degree of flexibility of the sealing lips 6 and 7 is achieved by virtue of the fact the sealing ring 5 is provided with recesses 8 and 9 that extend radially around the sealing ring on both of its lateral flanks above the sealing lips 6 and 7 . This gives the sealing ring 5 a waist above the sealing lips 6 and 7 , which make these sealing lips very mobile.
  • a recess 8 , 9 does not have to be provided on each lateral flank of the sealing ring 5 .
  • This recess 8 would namely have the effect that lubricant from the transmission chamber of the machine tool could penetrate into this recess and, due to the pressure of the lubricant in the recess 8 , the sealing lip 6 disposed underneath it would be pressed against the percussion bolt 3 with a greater pressure.
  • the flexibility of the sealing lips 6 and 7 could be further increased by providing not only one recess 8 , 9 on each lateral flank of the sealing ring 5 , but a number of radially extending recesses that are offset from one another.
  • the sealing ring 5 is preferably comprised of an elastomer material.
  • a sealing ring 5 which has a cross-sectional form that is symmetrical with regard to a radial central plane 10 , no particular insertion direction of the sealing ring 5 needs to be maintained.
  • the region of the sealing ring 5 oriented away from the percussion bolt 3 fills the annular groove 4 in the tool holder 1 over its entire width and rests flush in the groove.
  • the outer region of the sealing ring 5 has a high degree of stability and a favorable adhesion in the tool holder 1 so that the ring is secured against sliding in the axial direction and against rotating around the tool holder axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

A low-wear sealing ring, which assures a favorable sealing action that prevents the escape of lubricants from the transmission chamber of the machine tool and prevents the entry of dust into the transmission chamber, has a number of sealing lips (6, 7) that rest against a percussion bolt (3) in the machine tool. At least on its lateral flank oriented toward the machine, the sealing ring (4) is provided with one or more radially extending recesses (8, 9). This lends the sealing lips (6, 7) a high degree of flexibility, allowing them to easily follow the movements of the percussion bolt (3), as a result of which the sealing ring (4) has a low susceptibility to wear and assures a high degree of impermeability.

Description

    PRIOR ART
  • The current invention relates to a hand power tool with a tool holder, which can be driven in a rotary and percussive fashion and in which a percussion bolt is supported so that it can move axially, in which the tool holder contains at least one sealing ring that encompasses the percussion bolt. [0001]
  • DE 197 24 532 A1 has disclosed a drilling and hammering machine tool of this kind. The percussion bolt must be sealed in relation to the tool holder in such a way that on the one hand, no lubricant escapes from the transmission chamber of the machine tool and on the other hand, no dirt from the outside gets into the transmission chamber of the machine through the tool holder. To that end, in the known machine tool, sealing rings (O-rings) are inserted into two radially extending grooves of the percussion bolt, which seal the gap between the percussion bolt and the inside of the tool holder. [0002]
  • In a percussive machine tool, the percussion bolt moves in the axial direction, for example with a frequency of 65 to 85 Hz and an amplitude of 1 to 10 mm. In addition, the percussion bolt also moves in the radial direction depending on component tolerances and a thermal expansion of the materials. Under these circumstances, a seal inserted between the percussion bolt and the tool holder experiences a relatively high amount of wear. The object of the invention, therefore, is to produce a sealing ring, which experiences the least amount of wear possible due to the motion of the percussion bolt and therefore assures a high degree of impermeability over a long operation time of the machine tool. [0003]
    • ADVANTAGES OF THE INVENTION
  • The stated object is attained with the features of [0004] claim 1 by virtue of the fact that the sealing ring has a number of sealing lips that rest against the percussion bolt and that at least on its lateral flank oriented toward the machine, the sealing ring is provided with one or more radially extending recesses. This particular formation of the sealing ring lends the sealing lips a very high degree of flexibility so that they can easily follow the axial and radial movements and the thermal expansion of the material without a large amount of wear and consequently produce a reliable sealing of the percussion bolt in the tool holder.
  • Because one or more radially extending recesses are provided on the lateral flank of the sealing ring oriented toward the machine, the penetration of lubricant (oil or grease) from the transmission chamber into the at least one recess causes the sealing lip oriented toward machine to experience an increased pressure against the percussion bolt and consequently increases the impermeability against an escape of lubricant from the transmission chamber of the machine tool. If the lateral flank of the sealing ring oriented toward the tool is also provided with one or more radially extending recesses, this also lends the sealing lip oriented toward the tool a high degree of flexibility, allowing it to easily follow the axial and radial movements of the percussion bolt as well as thermal expansions of the material and consequently produces an effective seal of the transmission chamber of the machine tool against penetration of dust through the tool holder. [0005]
  • Advantageous modifications of the invention can be inferred from the dependent claims. [0006]
  • It is useful to provide both lateral flanks of the sealing ring with one or more recesses in order, as mentioned above, to produce a seal that prevents both the penetration of dust and the escape of lubricant. [0007]
  • The sealing ring preferably has a cross-sectional form that is symmetrical with regard to a radial central plane thus preventing a laterally reversed insertion of the sealing ring. [0008]
  • A favorable adhesion of the sealing ring in the tool holder is achieved by virtue of the fact that the sealing ring is fitted with its side oriented away from the percussion bolt into a radially extending groove in the tool holder.[0009]
    • DESCRIPTION OF AN EXEMPLARY EMBODIMENT
  • The invention will be explained in detail below in conjunction with an exemplary embodiment shown in the drawing. [0010]
  • The sole FIGURE of the drawing shows a longitudinal section through the front part of a rotating and hammering hand power tool, namely a percussive drill or a hammer drill. Freed of all parts of the hand power tool that are unnecessary for the explanation of the invention, the drawing shows a [0011] tool holder 1 with a receiving bore 2 for a tool, for example a drill bit, a chisel, or the like. This tool holder transmits a rotary motion from a drive mechanism that is not shown to a tool that is inserted into it. A percussion bolt 3 is supported so that it can move axially in the tool holder 1. A drive mechanism moves this percussion bolt 3 back and forth axially in the tool holder 1 with a frequency of 65 to 85 Hz and an amplitude of 1 to 10 mm and transfers this motion to a tool inserted into the tool holder 1.
  • A [0012] sealing ring 5, which encompasses the percussion bolt 3, is inserted into an annular groove 4 on the inside of the tool holder 1. The purpose of this sealing ring 5 on the one hand is to prevent an escape of lubricant (grease or oil) from the transmission chamber of the machine tool into the tool holder 1 and on the other hand to prevent the penetration of dust from the tool holder 1 into the transmission chamber. Fulfilling these high sealing requirements for the longest possible operating time of the machine tool is problematic because the percussion bolt 3 encompassed by the sealing ring 5 moves not only in the axial direction, but also moves in the radial direction due to component tolerances and thermal expansion of the materials. In order, even with these movements of the percussion bolt 3, to minimize the wear susceptibility of the sealing ring 5 and therefore a slackening of its sealing action, the sealing ring 5 has two parallel sealing lips 6 and 7 in the axial direction of the percussion bolt 3. The sealing lip 6 oriented toward the interior of the machine seals the transmission chamber against the escape of lubricant and the sealing lip 7 oriented toward the tool produces a seal preventing the penetration of dust from the tool holder 1. The sealing ring 5 is thus formed so that separate sealing lips 6 and 7 perform the two sealing functions. The sealing ring 5 can also have more than two sealing lips.
  • A rapid wear of the [0013] sealing ring 5 and therefore a loss of sealing action can be counteracted by giving the sealing lips 6 and 7 a high degree of flexibility so that they can easily follow the axial and radial movements of the percussion bolt 3. A high degree of flexibility of the sealing lips 6 and 7 is achieved by virtue of the fact the sealing ring 5 is provided with recesses 8 and 9 that extend radially around the sealing ring on both of its lateral flanks above the sealing lips 6 and 7. This gives the sealing ring 5 a waist above the sealing lips 6 and 7, which make these sealing lips very mobile.
  • In contrast to the exemplary embodiment shown, a [0014] recess 8, 9 does not have to be provided on each lateral flank of the sealing ring 5. However, it is advantageous to provide at least one recess 8 on the lateral flank oriented toward the machine. This recess 8 would namely have the effect that lubricant from the transmission chamber of the machine tool could penetrate into this recess and, due to the pressure of the lubricant in the recess 8, the sealing lip 6 disposed underneath it would be pressed against the percussion bolt 3 with a greater pressure.
  • The size and depth of the [0015] recesses 8 and 9 and depending on them, the thickness of the sealing lips 6 and 7, influence the flexibility of the sealing lips 6 and 7 and their contact force against the percussion bolt 3. The flexibility of the sealing lips 6 and 7 could be further increased by providing not only one recess 8, 9 on each lateral flank of the sealing ring 5, but a number of radially extending recesses that are offset from one another.
  • The ends of the [0016] sealing lips 6 and 7 resting against the percussion bolt 3 are rounded so that they can slide as well as possible against the moving percussion bolt 3.
  • The sealing [0017] ring 5 is preferably comprised of an elastomer material.
  • If, as shown in the drawing, a [0018] sealing ring 5 is used, which has a cross-sectional form that is symmetrical with regard to a radial central plane 10, no particular insertion direction of the sealing ring 5 needs to be maintained.
  • The region of the [0019] sealing ring 5 oriented away from the percussion bolt 3 fills the annular groove 4 in the tool holder 1 over its entire width and rests flush in the groove. As a result, the outer region of the sealing ring 5 has a high degree of stability and a favorable adhesion in the tool holder 1 so that the ring is secured against sliding in the axial direction and against rotating around the tool holder axis.

Claims (4)

1. A hand power tool with a tool holder (1), which can be driven in a rotary and percussive fashion and in which a percussion bolt (3) is supported so that it can move axially, in which the tool holder (1) contains at least one sealing ring (5) that encompasses the percussion bolt (3), characterized in that the sealing ring (5) has a number of sealing lips (6, 7) that rest against the percussion bolt (3) and that the sealing ring (5), at least on its lateral flank oriented toward the machine, is provided with one or more radially extending recesses (8, 9).
2. The hand power tool according to claim 1, characterized in that the sealing ring (5) is provided with one or more radially extending recesses (8, 9) on each of its two lateral flanks.
3. The hand power tool according to claim 1 or claim 2, characterized in that the sealing ring (5) has a cross-sectional form that is symmetrical in relation to a radial central plane (10).
4. The hand power tool according to claim 1, characterized in that with its side oriented away from the percussion bolt (3), the sealing ring (5) is fitted into a radially extending groove (4) in the tool holder (1).
US10/168,916 2000-10-28 2001-10-18 Hand-held machine tool comprising a sealing ring disposed in the tool holder Abandoned US20030000715A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10053580A DE10053580A1 (en) 2000-10-28 2000-10-28 Hand machine tool with a sealing ring arranged in a tool holder
DE10053580.1 2000-10-28

Publications (1)

Publication Number Publication Date
US20030000715A1 true US20030000715A1 (en) 2003-01-02

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US10/168,916 Abandoned US20030000715A1 (en) 2000-10-28 2001-10-18 Hand-held machine tool comprising a sealing ring disposed in the tool holder

Country Status (5)

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US (1) US20030000715A1 (en)
EP (1) EP1332022A1 (en)
JP (1) JP2004512477A (en)
DE (1) DE10053580A1 (en)
WO (1) WO2002034475A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2409122A (en) * 2003-11-05 2005-06-15 Canon Europa Nv Automatic generation and use of colour profiles for printers by locating a spectrophotometer within the printer
US20050167131A1 (en) * 2004-02-02 2005-08-04 Sandvik Tamrock Oy Hydraulic hammer
US20060054012A1 (en) * 2004-09-10 2006-03-16 Otto Baumann Hand power tool with percussion bolt sealing
US8360167B2 (en) 2010-08-11 2013-01-29 Caterpillar Inc. Composite seal for a hydraulic hammer
WO2016025182A1 (en) * 2014-08-11 2016-02-18 Caterpillar Inc. Hydraulic hammer having single piece seal assembly
CN113874146A (en) * 2019-07-11 2021-12-31 喜利得股份公司 Sealing lip on tool assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130027490A (en) * 2010-03-26 2013-03-15 메르빈 루드글리 Hand tool sealing devices and methods
DE102010013072A1 (en) * 2010-03-26 2011-09-29 Dorma Gmbh + Co. Kg Device for opening and / or closing a door
JP6006375B1 (en) * 2015-06-18 2016-10-12 サンドビック．マイニング．アンド．コンストラクション．オイ Tool sealing member and sealing method
CN108518493B (en) * 2018-05-03 2019-06-25 温州职业技术学院 A kind of fluid pressure type Plunger Globe Valves door

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067584A (en) * 1962-02-15 1962-12-11 Black & Decker Mfg Co Sealing ring means for reciprocating piston used in power-operated percussive tool
DE3637354A1 (en) * 1986-11-03 1988-05-05 Bosch Gmbh Robert Tool holder
JP3606021B2 (en) * 1996-12-13 2005-01-05 日立工機株式会社 Impact tool
GB9902793D0 (en) * 1999-02-09 1999-03-31 Black & Decker Inc Rotary hammer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2409122A (en) * 2003-11-05 2005-06-15 Canon Europa Nv Automatic generation and use of colour profiles for printers by locating a spectrophotometer within the printer
US20050167131A1 (en) * 2004-02-02 2005-08-04 Sandvik Tamrock Oy Hydraulic hammer
US7152692B2 (en) 2004-02-02 2006-12-26 Sandvik Tamrock Oy Hydraulic hammer having a sealing bushing
US20060054012A1 (en) * 2004-09-10 2006-03-16 Otto Baumann Hand power tool with percussion bolt sealing
GB2418390A (en) * 2004-09-10 2006-03-29 Bosch Gmbh Robert Hand-held power tool with sealing element
GB2418390B (en) * 2004-09-10 2006-12-13 Bosch Gmbh Robert Hand-held power tool with percussive pin seal
US8360167B2 (en) 2010-08-11 2013-01-29 Caterpillar Inc. Composite seal for a hydraulic hammer
WO2016025182A1 (en) * 2014-08-11 2016-02-18 Caterpillar Inc. Hydraulic hammer having single piece seal assembly
CN106660199A (en) * 2014-08-11 2017-05-10 卡特彼勒公司 Hydraulic hammer having single piece seal assembly
CN113874146A (en) * 2019-07-11 2021-12-31 喜利得股份公司 Sealing lip on tool assembly

Also Published As

Publication number Publication date
JP2004512477A (en) 2004-04-22
EP1332022A1 (en) 2003-08-06
DE10053580A1 (en) 2002-06-06
WO2002034475A1 (en) 2002-05-02

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