EP1258322A2 - Tournevis motorisé avec embrayage limitateur de couple - Google Patents

Tournevis motorisé avec embrayage limitateur de couple Download PDF

Info

Publication number
EP1258322A2
EP1258322A2 EP02010511A EP02010511A EP1258322A2 EP 1258322 A2 EP1258322 A2 EP 1258322A2 EP 02010511 A EP02010511 A EP 02010511A EP 02010511 A EP02010511 A EP 02010511A EP 1258322 A2 EP1258322 A2 EP 1258322A2
Authority
EP
European Patent Office
Prior art keywords
spindle
screwdriver
torque
coupling
gear
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
EP02010511A
Other languages
German (de)
English (en)
Other versions
EP1258322A3 (fr
EP1258322B1 (fr
Inventor
Holger Listl
Klaus Schmitz
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.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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 C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP1258322A2 publication Critical patent/EP1258322A2/fr
Publication of EP1258322A3 publication Critical patent/EP1258322A3/fr
Application granted granted Critical
Publication of EP1258322B1 publication Critical patent/EP1258322B1/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
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/141—Mechanical overload release couplings

Definitions

  • the invention relates to a power screwdriver Screwing in and loosening screws, with a torque limiting coupling, the one drive the screwdriver with a one Tool holder driving spindle until reaching a preset trigger torque couples.
  • Such a screwdriver is known from WO 99/16858.
  • Torque limit clutches are in a powertrain between a drive of the screwdriver and a tool holder arranged.
  • the torque limiting clutch interrupts the connection between the drive and the tool holder, as soon as a screwed-in screw with the desired force in a thread receiving the screw is clamped.
  • the Torque with which the screwdriver is then driven to the a stuck screw acts as the release torque and can usually be set on the torque limiting clutch become. So that the drive does not release the torque limiting clutch idle, the torque limiting clutch works usually on an additional switch, at the Actuation of the drive is switched off. With a change the direction of rotation, i.e. To loosen screws, a higher one must be used Torque than be applied when screwing in, so for this suitable torque limiting clutches are often asymmetrical Show trigger behavior.
  • a screwdriver is known from WO 99/16858 mentioned at the beginning, its torque-dependent clutch, which triggers as a function of torque between a housing of the screwdriver and a Ring gear of a planetary gear is arranged.
  • the ring gear takes a reaction torque of the planetary gear the drive spindle and is rotatably accommodated in the housing.
  • the torque limiting clutch has an axially displaceable ring gear, which is clamped against the ring gear with the help of a compression spring.
  • a compression spring are on a face of the ring gear facing the ring gear three recesses formed in which spherical rolling elements are kept captive.
  • On the ring gear itself is on the a tread formed on the end face facing the ring gear, arranged on the three cams with equal angular distances are.
  • the invention solves this problem with a screwdriver at the beginning mentioned type in that the torque limiting clutch is connected to the spindle via a play coupling.
  • the invention is based on the finding that the inaccurate Compliance with the preset triggering moment on the effect the torque limiting clutch decreases. If this is namely triggers after screwing in a screw, so practice it over the spindle acting in the opposite direction (release direction) Torque on the screw, i.e. the screw will after reaching the release torque always loosened again slightly. Because the value of the torque acting in the release direction is unknown is the actual tightening torque with which the Screw is screwed in, do not predict accurately.
  • the torque acting in the release direction arises when the trigger is released the torque limiting clutch in that the compression spring on the two coupling parts involved, namely the ring gear and the ring gear, continues to exert pressure after this axially when the torque limiting clutch is released Direction apart.
  • This pressure is now over the rolling elements on the also inclined back of the cams, whereby on the ring gear on which the cams are formed, a torque is applied.
  • This torque on the ring gear causes a release torque on the planetary gear the spindle is exerted and the screw is thus loosened again.
  • the game clutch according to the invention between the torque limiting clutch and the spindle now causes a such loosening torque is not from the torque limiting clutch can be transferred to the spindle, because the play clutch at automatically changes the direction of rotation.
  • screwdriver facts apply correspondingly for torque limiting clutches of another type, e.g. also for those arranged directly in a drive train Torque limit clutches that do not have a gearbox act on the spindle. Because torque limiting clutches for screwdrivers always two braced against each other Have coupling parts, it occurs when the torque limiting clutch after a release it couples again to one Relative movement between the two coupling parts leading to one loosening torque acting on the spindle.
  • the torque limiting clutch has a first and a second Coupling part which, when the torque limiting clutch is closed engage, the first coupling part rotatable with a housing of the screwdriver and that second coupling part rotatably with a reaction torque opposite a spindle receiving and opposite the housing freely rotatable reaction part of a transmission is connected.
  • this has the advantage that there is no rotational movement of the two coupling parts when the torque limiting clutch is closed. This acts on the coupling parts and any intended Balls that cause the coupling between the coupling parts no significant centrifugal forces, which lead to their wear contribute.
  • the game coupling then preferably connects the reaction part of the gearbox with the spindle.
  • reaction part has a plurality of planet gears receiving ring gear of a planetary gear.
  • Planetary gears are special due to their distribution of forces reliable and durable and are therefore particularly suitable for power-driven screwdrivers in the commercial sector.
  • the game clutch not directly between the ring gear, but between a planet carrier of a last gear stage the planetary gear and the spindle arranged.
  • this integration takes place characterized in that the play coupling is rotationally fixed to the spindle connected driving wheel, from which there are several wings extend radially outward in a coupled state rest on approaches of the planet carrier.
  • the approaches are preferably by truncating planetary gear axles formed, the planet gears and the planet carrier push through.
  • Fig. 1 is a screwdriver according to the invention in a side view shown with the housing part partially removed and designated a total of 10.
  • the screwdriver 10 has a housing 11 with a main housing part 12 on which a handle portion 16 is formed. From there, a main switch 18 is convenient can be operated by an operator.
  • a main switch 18 is convenient can be operated by an operator.
  • an angular head housing 19 rotatable Angle head 20 attached, at right angles to a longitudinal axis of the screwdriver 10 protrudes a tool holder 22.
  • Screwdrivers are usually used as rod angle screwdrivers designated and have compared to conventional power-driven Screwdrivers have the advantage that the reaction torque absorbed by the screwdriver not twisting when screwing in screws of the screwdriver around its longitudinal axis, but to one Swiveling the screwdriver around the right-angled, through the tool holder 22 leads axis. Such Swivel movements are easier for an operator record as rotations of the screwdriver around its longitudinal axis.
  • the screwdriver 10 has, for example, an electric motor executed drive 32 on the opposite to one another the main housing part 12 fixed support sleeve 34 attached is.
  • the drive 32 drives via an intermediate shaft 36 Reduction gear in the form of a planetary gear 38 which sets a spindle 40 in rotation on the output side.
  • the Spindle 40 drives via an arranged in the angle head 20 Bevel gear toothing 46 on a tool spindle 44 on its free end carries the tool holder 22.
  • a torque limiting clutch 50 schematically shown that a reaction moment against the Spindle 40 receiving reaction part of the planetary gear 38 couples with an adjusting sleeve 52.
  • the adjusting sleeve 52 is in one piece formed with an angle head housing 19 or over one or more intermediate parts rotatably connected to this.
  • the entire angle head 20 i.e. the angle head housing 19 with housed therein Bearings 55 and 56 for the spindles 40 and 44 and the adjusting sleeve 52, opposite the housing-fixed carrier sleeve 34 along a here twisted adjustment device 58.
  • the torque limiting clutch is 50 also the reaction part of the planetary gear 38 opposite the angular head 20 fixed in rotation and via the adjusting device 58 coupled to the drive 32.
  • Fig. 2 shows in an axial section details of in Fig. 1 only schematically shown parts inside the screwdriver 10th
  • first sun gear 64 meshes with three first planet gears 66 one first planetary gear stage, of which only two can be seen in FIG. 2 are.
  • the first planet gears 66 are on a first planet gear carrier 68 rotatably attached and comb at the same time a ring gear 70, which extends over the entire axial length of the planetary gear 38 extends.
  • the first planet gear Carrier 68 is integrally formed with a second sun gear 72 or rotatably connected, which with second planet gears 74 combs.
  • the second planet gears 74 are in turn on a second planet carrier 76 rotatably supported and mesh also with the ring gear 70.
  • the sockets 80 and the driving wheel 84 together form a further below using the 3 game clutch 86 explained in more detail.
  • the ring gear 70 which is opposite the intermediate shaft 62 and the Spindle 40 takes over a reaction moment and thus the reaction part of the planetary gear 38 is over a Bearing 88 rotatable in the support sleeve screwed to the drive 32 34 and the associated via the adjusting device 58 Adjustment sleeve 52 added.
  • the ring gear 70 is on the Adjusting sleeve 52 (or a part connected to it in a rotationally fixed manner) the torque limiting clutch 50 set.
  • the switching ring 96 is axial, i.e. in the longitudinal direction 95 of the spindle 40, displaceable, however rotatably in an intermediate sleeve connected to the adjusting sleeve 52 98 added.
  • the non-rotatable, but axially movable Arrangement of the switching ring 96 is with the help of first and second longitudinal grooves 100 and 101 achieved on a peripheral surface of the switching ring 96 or on the inside on the intermediate sleeve 98 are arranged and interact with guide balls 102, over the in the first and second longitudinal grooves 100 and 101 rolling guide balls 102 can switch ring 96 and Intermediate sleeve 98 are displaced relative to one another in the axial direction, a snap ring inserted into the intermediate sleeve 98 105 prevents the guide balls 102 from falling out.
  • rollers 104 On the side of the switching ring 96 facing the cam ring 90 are circumferentially three rollers 104 rotatably mounted on axes 106.
  • the rollers 104 can roll on a cam track 108, that on an end face facing the switching ring 96 of the cam ring 90 is formed.
  • At the cam ring 90 facing end of the switching ring 96 are also three Projections 109 formed.
  • the rollers 104 abut while a screw is being screwed in formed on the cam track 108 so that the reaction torque exerted on the ring gear 70 via the cams, the rollers 104 and the switching ring 96 on the intermediate sleeve 98 and thereby to the adjusting sleeve 52 connected to it in a rotationally fixed manner is transmitted so that the ring gear 70 during the screwing one screw rests. If the torque increases, it grows Torque acting on the cam ring 90 until there is Finally, the cam ring 90 begins to rotate and thereby the rollers 104 and thus the switching ring 96 counter to its cams the force of the compression spring 94 increases. With further rotation the cam ring 90 then runs under with its cams the rollers 104 away, so that the rollers 104 with the Switch ring 96 finally again under the pressure of the compression spring 94 lower.
  • the planetary gear 38 is no longer rotationally fixed set so that the drive 32 on the spindle 40th applied torque is practically reduced to zero.
  • the game clutch 86 is between the output of the Planetary gear 38 and the spindle 40 shown in perspective.
  • the game coupling comprises the three nozzles 80, the the planet gear axles passing through the second planet gear carrier 76 82 are formed, and the driving wheel 84, which in a central recess of the second planet carrier 76 is rotatably guided.
  • the driving wheel 84 has a central, designed as a hexagon passage 130 in which in assembled state one end of the also hexagonal in cross section Spindle 40 is inserted. From the middle of the Driving wheel 84 radially extends three wings 132 outside, to the extent that it is in contact with the socket 80 can reach.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Retarders (AREA)
EP02010511A 2001-05-14 2002-05-10 Tournevis motorisé avec embrayage limitateur de couple Expired - Lifetime EP1258322B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10124572A DE10124572A1 (de) 2001-05-14 2001-05-14 Kraftgetriebener Schrauber mit Drehmomentbegrenzungskupplung
DE10124572 2001-05-14

Publications (3)

Publication Number Publication Date
EP1258322A2 true EP1258322A2 (fr) 2002-11-20
EP1258322A3 EP1258322A3 (fr) 2005-02-09
EP1258322B1 EP1258322B1 (fr) 2011-03-23

Family

ID=7685485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02010511A Expired - Lifetime EP1258322B1 (fr) 2001-05-14 2002-05-10 Tournevis motorisé avec embrayage limitateur de couple

Country Status (4)

Country Link
EP (1) EP1258322B1 (fr)
AT (1) ATE502730T1 (fr)
DE (2) DE10124572A1 (fr)
ES (1) ES2362350T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2421459A (en) * 2004-12-23 2006-06-28 Black & Decker Inc Transmission housing for a power tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011001477U1 (de) 2011-01-13 2011-03-24 Metabowerke Gmbh Aufsatz für eine handgeführte Werkzeugmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5738177A (en) * 1995-07-28 1998-04-14 Black & Decker Inc. Production assembly tool
WO1999016585A1 (fr) * 1996-09-16 1999-04-08 Atlas Copco Tools Ab Serreuse mecanique a coupure

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE683190C (de) * 1933-10-05 1939-11-01 Bosch Gmbh Robert Kraftbetriebene Werkzeugmaschine
US3277670A (en) * 1963-09-24 1966-10-11 Standard Pneumatic Motor Compa Automatic release pneumatic tool
DE4129349A1 (de) * 1991-09-04 1993-03-11 Hoffmann Reinhold Fa Zierknopf
US5372206A (en) * 1992-10-01 1994-12-13 Makita Corporation Tightening tool
DE4344849A1 (de) * 1993-12-29 1995-07-06 Fein C & E Werkzeugmaschine
JP3514034B2 (ja) * 1996-05-10 2004-03-31 日立工機株式会社 シャーレンチ
DE19845018C1 (de) * 1998-09-30 1999-12-16 Fein C & E Kraftgetriebener Schrauber

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5738177A (en) * 1995-07-28 1998-04-14 Black & Decker Inc. Production assembly tool
WO1999016585A1 (fr) * 1996-09-16 1999-04-08 Atlas Copco Tools Ab Serreuse mecanique a coupure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2421459A (en) * 2004-12-23 2006-06-28 Black & Decker Inc Transmission housing for a power tool

Also Published As

Publication number Publication date
DE10124572A1 (de) 2002-11-21
EP1258322A3 (fr) 2005-02-09
ATE502730T1 (de) 2011-04-15
ES2362350T3 (es) 2011-07-01
DE50214972D1 (de) 2011-05-05
EP1258322B1 (fr) 2011-03-23

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