EP1258322B1 - Tournevis motorisé avec embrayage limitateur de couple - Google Patents

Tournevis motorisé avec embrayage limitateur de couple Download PDF

Info

Publication number
EP1258322B1
EP1258322B1 EP02010511A EP02010511A EP1258322B1 EP 1258322 B1 EP1258322 B1 EP 1258322B1 EP 02010511 A EP02010511 A EP 02010511A EP 02010511 A EP02010511 A EP 02010511A EP 1258322 B1 EP1258322 B1 EP 1258322B1
Authority
EP
European Patent Office
Prior art keywords
spindle
coupling
screwdriver
torque limiting
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.)
Expired - Lifetime
Application number
EP02010511A
Other languages
German (de)
English (en)
Other versions
EP1258322A2 (fr
EP1258322A3 (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 for screwing and loosening of screws, with a torque limiting coupling which couples a drive of the screwdriver with a spindle driving a tool holder until reaching a preset triggering torque, wherein the torque limiting coupling is connected to the spindle via a backlash.
  • Such a screwdriver is from the US-A-5,738,177 known.
  • Power-driven screwdrivers for screwing in and loosening screws have increasingly replaced conventional manual screwdrivers in the past.
  • power-driven screwdrivers are used with a torque-dependent triggering torque limiting clutch, since there screws are usually screwed with well-defined torques.
  • torque-dependent triggering torque limiting clutch since there screws are usually screwed with well-defined torques.
  • Under screws are understood in the broadest sense, all types of threaded fasteners, ie in particular also nuts.
  • Torque limiting clutches are placed in a drive train between a driver of the screwdriver and a tool holder.
  • the torque limiting clutch breaks the connection between the drive and the tool holder as soon as a screwed-in screw is clamped with the desired force in a screw-receiving thread.
  • the torque with which the drive of the screwdriver then acts on the stuck screw is called the tripping torque and can usually be set on the torque limiting clutch. So that the drive does not idle after loosening the torque limiting clutch, the torque limiting clutch usually acts on an additional switch, upon actuation of the drive is turned off.
  • a screwdriver which is formed with a planetary gear and has a torque-limiting coupling which is arranged between a ring gear and the tool housing, wherein the ring gear has a spring-loaded pressure element which cooperates with cam elements via balls and a cam surface.
  • a REED relay is used, which is actuated by a swivel lever with permanent magnets.
  • the invention has for its object to improve a power screwdriver of the type mentioned in such a way that results in a simple and compact design and that a preset release torque is maintained as accurately as possible.
  • the reaction part is a ring gear of a planetary gear which receives a plurality of planetary gears
  • the reaction part can be accommodated in a compact screwdriver in a particularly space-saving manner.
  • the backlash between a planet carrier of the last gear stage of the planetary gear and the spindle is arranged so any reaction moments that are exerted directly by the spindle, neutralized via the backlash. This results in a particularly high precision in terms of compliance with a preset release torque.
  • the knowledge is exploited that the inaccurate compliance with the preset triggering torque is due to the effect of torque limiting clutch. Namely, if this triggers after screwing a screw, so it exerts on the spindle in the opposite direction (release direction) acting torque on the screw, ie the screw is always easily solved after reaching the trigger torque. Since the value of the torque acting in the release direction is unknown, the actual tightening torque with which the screw is screwed in can not be accurately predicted.
  • the torque acting in the release direction arises when the torque limiting clutch is triggered by the pressure spring continuing to exert pressure on the two clutch parts involved, namely the ring gear and the ring gear, after they have moved apart in the axial direction when the torque limiting clutch is released.
  • This pressure now acts on the rolling elements on the likewise inclined rear side of the cam, whereby a torque is exerted on the ring gear on which the cams are formed.
  • This torque on the ring gear causes a release torque exerted on the spindle via the planetary gear and thus the screw is released again.
  • the torque limiting clutch having a first and a second coupling part, which engage with closed torque limiting clutch, wherein the first coupling member rotatably with a housing of the screwdriver and the second coupling member rotationally fixed with a reaction torque against a spindle receiving and with respect to the housing freely rotatable reaction part of a transmission is connected.
  • Opposite torque limiting clutches which are arranged directly between two sections of a drive train, this has the advantage that no rotational movement of the two coupling parts takes place when the torque limiting clutch is closed. As a result, acting on the coupling parts and possibly provided balls that cause the coupling between the coupling parts, no significant centrifugal forces that contribute to their wear.
  • the clearance clutch then connects the reaction part of the transmission to the spindle.
  • reaction part is a planetary gear receiving a ring gear of a planetary gear.
  • planetary gearboxes Due to their distribution of forces, planetary gearboxes are particularly reliable and long-lasting, making them particularly suitable for power-driven screwdrivers in the commercial sector.
  • the backlash is not arranged directly between the ring gear, but between a planet carrier of a final gear stage of the planetary gear and the spindle.
  • this integration takes place in that the play clutch has a rotatably connected to the spindle driving wheel, from which several wings extend radially outward, which abut in a coupled state to lugs of the planet carrier.
  • the lugs on the planet carrier can be designed as simple pins or projections, which can engage the wings of the driving wheel.
  • the approaches are formed by stubs of Planetenradachsen that carry planetary gears and enforce the planet.
  • FIG. 1 an inventive screwdriver is shown in a side view with partially removed housing part and designated 10 in total.
  • 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 conveniently operated by an operator.
  • a main switch 18 is conveniently operated by an operator.
  • an angle head housing 19 of an angle head 20 is rotatably mounted, from which a tool holder 22 protrudes at right angles to a longitudinal axis of the screwdriver 10.
  • Such screwdrivers are commonly referred to as rod angle screwdrivers and have the advantage over conventional power driven screwdrivers that the torque absorbed by the screwdriver when screwing screws not to a twisting of the screwdriver about its longitudinal axis, but to a pivoting of the screwdriver at right angles angled, through the tool holder 22 fixed axis leads. Such pivotal movements can be more easily absorbed by an operator than rotations of the screwdriver about its longitudinal axis.
  • the screwdriver 10 has an example designed as an electric motor drive 32 which is rotatably attached to a fixed relative to the main housing part 12 support sleeve 34.
  • the drive 32 drives via an intermediate shaft 36 to a reduction gear in the form of a planetary gear 38, which on the output side, a spindle 40 is rotated.
  • the spindle 40 drives a tool spindle 44 via a bevel gear arrangement 46 arranged in the angle head 20, which tool holder carries the tool holder 22 at its free end.
  • a torque limiting clutch 50 is shown schematically, which couples a reaction torque with respect to the spindle 40 receiving reaction part of the planetary gear 38 with a control sleeve 52.
  • the adjusting sleeve 52 is integrally formed with an angle head housing 19 or rotatably connected via one or more intermediate parts with this.
  • the angle head 20 for example in the in Fig. 1 Dashed position shown, the entire angle head 20, ie, the angle head housing 19 with housed bearings 55 and 56 for the spindles 40 and 44 and the adjusting sleeve 52, relative to the housing-fixed support sleeve 34 along a running here as a screw adjustment device 58 is rotated.
  • the torque limiting clutch 50 is closed, the reaction part of the planetary gear 38 is fixed against rotation relative to the angle head 20 and coupled to the drive 32 via the adjusting device 58.
  • Fig. 2 shows in an axial section details of in Fig. 1 only schematically illustrated parts in the interior of the screwdriver 10th
  • first sun gear 64 On a rotor neck 60 of in Fig. 2 only indicated drive 32 is an intermediate shaft 62 rotatably pushed, which is integrally formed with a first sun gear 64 of the two-stage planetary gear 38.
  • the first sun gear 64 meshes with three first planetary gears 66 of a first planetary gear stage, of which in Fig. 2 only two are recognizable.
  • the first planetary gears 66 are rotatably mounted on a first planet carrier 68 and mesh simultaneously with a ring gear 70 which extends over the entire axial length of the planetary gear 38.
  • the first planet carrier 68 is integrally formed with a second sun gear 72 or rotatably connected, which meshes with second planetary gears 74.
  • the second planet gears 74 are in turn rotatably mounted on a second planet carrier 76 and also mesh with the ring gear 70.
  • the nozzle 80 and the driving wheel 84 together form a further below with reference to Fig. 3 explained in more detail game clutch 86th
  • the ring gear 70 which assumes a reaction torque relative to the intermediate shaft 62 and the spindle 40 and thus represents the reaction part of the planetary gear 38, is rotatable via a bearing 88 in the carrier sleeve 34 bolted to the drive 32 and the adjusting sleeve 52 connected thereto via the adjusting device 58 added.
  • the ring gear 70 is on the adjusting sleeve 52 (or a non-rotatably connected part) via set the torque limiting clutch 50.
  • This comprises a rotatably screwed into the ring gear 70 cam ring 90, which projects beyond the ring gear 70 shoulder 92 is also supported on the bearing 88 on the adjusting sleeve 52, and a switching ring 96 which is clamped by a compression spring 94 against the cam ring 90.
  • the switching ring 96 is axially, ie in the longitudinal direction 95 of the spindle 40, slidably, but rotatably received in an associated with the adjusting sleeve 52 intermediate sleeve 98.
  • the rotationally fixed, but axially displaceable arrangement of the switching ring 96 is achieved by means of first and second longitudinal grooves 100 and 101, which are arranged on a peripheral surface of the switching ring 96 and the inside of the intermediate sleeve 98 and cooperate with guide balls 102, via the first and second longitudinal grooves 100 and 101 rolling guide balls 102, the switching ring 96 and the intermediate sleeve 98 can be moved to each other in the axial direction, wherein a snap ring 105 inserted into the intermediate sleeve 98 prevents falling out of the guide balls 102.
  • rollers 104 are rotatably mounted on axles 106 circumferentially.
  • the rollers 104 can roll on a cam track 108, which is formed on a switching ring 96 facing the end face of the cam ring 90.
  • a cam track 108 which is formed on a switching ring 96 facing the end face of the cam ring 90.
  • At the cam ring 90 facing end side of the switching ring 96 also three projections 109 are formed.
  • the rollers 104 are formed on the cam track 108 cams such that the force exerted on the ring gear 70 reaction torque on the cams, the rollers 104 and the switching ring 96 on the intermediate sleeve 98th and thereby is transmitted to the rotatably associated adjusting sleeve 52, so that the ring gear 70 rests during the screwing of a screw.
  • the torque acting on the cam ring 90 increases until, finally, the cam ring 90 begins to rotate, lifting the rollers 104 and thus the switching ring 96 counter to the force of the compression spring 94 with its cams.
  • this runs with its cams under the rollers 104, so that the rollers 104 with the switching ring 96 finally lower again under the pressure of the compression spring 94.
  • the play clutch 86 between the output of the planetary gear 38 and the spindle 40 is shown in perspective.
  • the play clutch comprises the three stubs 80, which are formed by the Planetenradachsen 82 passing through the second planet carrier 76, and the carrier wheel 84, which is rotatably guided in a central recess of the second Planetenradleys 76.
  • the entrainment wheel 84 has a central, executed as a hexagon socket passage 130, in the assembled state, an end of the cross-sectionally also hexagonal spindle 40 is inserted. From the center of the entraining wheel 84, three wings 132 extend radially outward, and indeed so far that they can get into contact with the nozzle 80.
  • the nozzle 80 When screwing a screw, the nozzle 80 rotate with this receiving second planet carrier 76 about the longitudinal axis 95 of the spindle 40 and thereby engage the wings 132 of the driving wheel 84 at. In this way, guided in the entrainment wheel 84 spindle 40 is coupled to the output of the planetary gear 38.
  • the rotation limiting coupling 50 then releases when the triggering torque is reached, the force exerted by the compression spring 94 causes the connecting pieces 80 to reverse their direction of rotation, as has already been explained in the introduction.
  • the sockets 80 are not in contact with the wings 132 of the carrier wheel 84, so that no torque is transmitted to the spindle 40. Since the movement of the nozzles 80 caused by the torque limiting clutch 50 is short, they remain in an intermediate position between the vanes 132. In a subsequent screwing the play clutch 86 therefore couples with a short delay.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Retarders (AREA)

Claims (3)

  1. Tournevis motorisé (10) pour visser et dévisser des vis, comprenant un embrayage limiteur de couple (50), qui accouple un entraînement (32) du tournevis (10) à une broche (40) entraînant un logement d'outil (22) jusqu'à l'obtention d'un couple de dévissage préajusté, l'embrayage limiteur de couple (50) étant connecté à la broche (40) par le biais d'un embrayage à jeu (86), caractérisé en ce que l'embrayage limiteur de couple (50) présente une première (96) et une deuxième partie d'embrayage (90), qui viennent en prise lorsque l'embrayage limiteur de couple (50) est fermé, la première partie d'embrayage (96) étant connectée de manière solidaire en rotation à un boîtier (11) du tournevis (10) et la deuxième partie d'embrayage (90) étant connectée de manière solidaire en rotation à une partie de réaction (70) d'une transmission (38), recevant un couple de réaction par rapport à une broche (40) et pouvant tourner librement par rapport au boîtier (11), en ce que l'embrayage à jeu relie la partie de réaction (70) de la transmission (38) à la broche (40), en ce que la partie de réaction est une couronne (70) d'un engrenage à pignons planétaires (38) recevant plusieurs pignons planétaires (66, 74), et en ce que l'embrayage à jeu (86) est disposé entre un porte-satellites (76) d'un dernier étage de transmission de l'engrenage planétaire (38) et la broche (40).
  2. Tournevis selon la revendication précédente, caractérisé en ce que l'embrayage à jeu présente une roue d'entraînement (84) connectée de manière solidaire en rotation à la broche (40), de laquelle s'étendent radialement vers l'extérieur plusieurs ailettes (132), qui s'appliquent dans un état accouplé contre des pièces rapportées (80) du porte-satellites (76).
  3. Tournevis selon la revendication 2, caractérisé en ce que les pièces rapportées sont formées par des picots (80) d'axes de pignons planétaires (82) qui supportent les pignons planétaires (74) et traversent le porte-satellites (76).
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
DE10124572 2001-05-14
DE10124572A DE10124572A1 (de) 2001-05-14 2001-05-14 Kraftgetriebener Schrauber mit Drehmomentbegrenzungskupplung

Publications (3)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0428210D0 (en) * 2004-12-23 2005-01-26 Black & Decker Inc Mode change mechanism
DE202011001477U1 (de) 2011-01-13 2011-03-24 Metabowerke Gmbh Aufsatz für eine handgeführte Werkzeugmaschine

Family Cites Families (9)

* 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
US5738177A (en) * 1995-07-28 1998-04-14 Black & Decker Inc. Production assembly tool
JP3514034B2 (ja) * 1996-05-10 2004-03-31 日立工機株式会社 シャーレンチ
SE507908C2 (sv) * 1996-09-16 1998-07-27 Atlas Copco Tools Ab Kraftmutterdragare med avstängning
DE19845018C1 (de) * 1998-09-30 1999-12-16 Fein C & E Kraftgetriebener Schrauber

Also Published As

Publication number Publication date
EP1258322A2 (fr) 2002-11-20
DE50214972D1 (de) 2011-05-05
EP1258322A3 (fr) 2005-02-09
ES2362350T3 (es) 2011-07-01
ATE502730T1 (de) 2011-04-15
DE10124572A1 (de) 2002-11-21

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