EP1657013B1 - Tool holder - Google Patents

Tool holder Download PDF

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Publication number
EP1657013B1
EP1657013B1 EP05110009A EP05110009A EP1657013B1 EP 1657013 B1 EP1657013 B1 EP 1657013B1 EP 05110009 A EP05110009 A EP 05110009A EP 05110009 A EP05110009 A EP 05110009A EP 1657013 B1 EP1657013 B1 EP 1657013B1
Authority
EP
European Patent Office
Prior art keywords
rotary driving
guide diameter
receiving
receiving sleeve
receiving side
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.)
Not-in-force
Application number
EP05110009A
Other languages
German (de)
French (fr)
Other versions
EP1657013A1 (en
Inventor
Werner Kleine
Werner Britten
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
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1657013A1 publication Critical patent/EP1657013A1/en
Application granted granted Critical
Publication of EP1657013B1 publication Critical patent/EP1657013B1/en
Not-in-force 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
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B25D2217/0042—Ball-shaped locking members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion
    • Y10T279/17068—Rotary socket
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion
    • Y10T279/17094—Sleeve type retainer
    • Y10T279/17102—Sleeve in socket

Definitions

  • the invention refers to a tool holder according to the preamble of claim 1 with a radially displaceable locking body, in particular for a hammer drill for receiving a percussion drill.
  • DE19724532 as well as the DE3205063 has a tool holder a, from a hollow cylindrical receiving sleeve of a guide diameter radially inwardly projecting with a web height, strip-shaped rotary driving web and a radially displaceable locking body.
  • the rotational drive web extends on the receiving side to the receiving side edge of the recess for the locking body over an axial length which corresponds approximately to the guide diameter.
  • the US5704744 discloses a tool holder with a plurality of opposite, of a uniform guide diameter of a hollow cylindrical receiving sleeve radially inwardly projecting, strip-shaped rotary driving webs of indefinite axial length with contact surfaces and a through a recess of the receiving sleeve in the axial region of the guide diameter through radially displaceable locking body.
  • the US5326199 discloses a tool holder with two opposite, of a drive side narrower guide diameter of a hollow cylindrical receiving sleeve radially inwardly einkragenden, strip-shaped rotary driving webs with contact surfaces and a radially through a recess of the receiving sleeve in the axial region of the guide diameter radially displaceable locking body, wherein the receiving side in a substantially radially enlarged sleeve area several soirmititgestge are ordered.
  • the object of the invention is to realize a damage and wear minimized tool holder for powerful hand tool machines.
  • a tool holder with at least two opposite, of a hollow cylindrical receiving sleeve of a guide diameter radially inwardly projecting, strip-shaped rotary driving webs with contact surfaces on at least one radially displaceable by a recess of the receiving sleeve locking body, wherein the receiving side end of the rotary driving webs a distance from the receiving side edge of the Recess has, which is greater than 1.5 times the guide diameter.
  • the fracture-mechanically critical axial region of the multiaxial stress state continuing at 45 ° on the receiving-side edge of the recess extends approximately on both sides approximately half of the guide diameter.
  • About the guide diameter corresponding beyond existing, additionally upstream contact length of the rotary driving webs is due to the limited torsional stiffness of the insertion at least the essential part of the torque impressed exclusively on the receiving side of the recess.
  • the above fracture mechanics critical axial region is thus exposed to lower loads, which at given Fatigue limit higher torque torque can be impressed damage. Due to the now significantly extended, in addition upstream contact length of the rotary driving webs, the user manually transferred over the machine tool applied jerky tensile loads with high torque shatterproof on the tool.
  • the length of the Drehit Vietnamesestege is at least three times the guide diameter, whereby a larger contact area is realized with the same cross-section, which results in standard loads to smaller surface pressures and thus significantly reduces the wear.
  • the smaller surface pressures lead to lower sliding friction losses associated with an axially limited freely movable in the receiving sleeve guided insertion end, whereby the impact energy transfer is improved.
  • the distance between the Drehit Vietnamesestege from the receiving end of the receiving sleeve is at most half of the guide diameter, which limits the not usable for the transmission of torque axial guide length of the receiving sleeve and thus the tool holder is shortened.
  • the sum of two contact surfaces oriented in the same direction of rotation is advantageously in the range between half and the whole of the square of the guide diameter, whereby the tool holder is dimensioned to the permissible surface pressure of 100-120 MPa recommended for steel-steel contact systems such as feather keys.
  • the receiving-side end of the rotary driving webs 4a, 4b has a distance X. from the receiving side edge of the recess 6, which corresponds to twice the guide diameter D.
  • the length L of the Drehit Vietnamesestege 4a, 4b is three times the guide diameter D and the distance Y of the receiving side end of the receiving sleeve 3 is one fifth of the guide diameter D.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Gripping On Spindles (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
  • Unwinding Webs (AREA)
  • Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Manipulator (AREA)

Abstract

The fitting has a hollow cylindrical shaped retainer socket (3) with rotation synchronization bars (4a, 4b) comprising contact surfaces. A radial displaceable locking body is provided over a cut of the hollow cylindrical shaped retainer socket. Lateral ends of the rotation synchronization bars are provided at a specific distance from the lateral ends of the cut, where the distance is 1.5 times larger than diameter (D) of the socket.

Description

Die Erfindung bezeichnet eine Werkzeugaufnahme gemäß dem Oberbegriff des Anspruchs 1 mit einem radial versetzbaren Verriegelungskörper, insbesondere für einen Bohrhammer zur Aufnahme eines Schlagbohrers.The invention refers to a tool holder according to the preamble of claim 1 with a radially displaceable locking body, in particular for a hammer drill for receiving a percussion drill.

Schlagend und drehend angetriebene Werkzeuge mit einem Einsteckende werden üblicherweise formschlüssig drehfest sowie begrenzt axial beweglich in einer Werkzeugaufnahme geführt, welche mittels zumindest eines, in eine maschinenseitig geschlossene Nut des Einsteckendes eindringenden, radial versetzbaren Verriegelungskörpers axial verriegelt werden.Schlagend and rotating driven tools with a spigot are usually positive rotationally and limited axially movable guided in a tool holder, which are axially locked by means of at least one, in a machine-side closed groove of the spigot penetrating, radially displaceable locking body.

Nach der DE19724532 sowie der DE3205063 weist eine Werkzeugaufnahme einen, von einer hohlzylinderförmigen Aufnahmehülse eines Führungsdurchmessers radial nach Innen mit einer Steghöhe einkragenden, leistenförmigen Drehmitnahmesteg und einen radial versetzbaren Verriegelungskörper auf. Der Drehmitnahmesteg erstreckt sich aufnahmeseitig zum aufnahmeseitigen Rand der Ausnehmung für den Verriegelungskörper über eine axiale Länge, welche etwa dem Führungsdurchmesser entspricht.After DE19724532 as well as the DE3205063 has a tool holder a, from a hollow cylindrical receiving sleeve of a guide diameter radially inwardly projecting with a web height, strip-shaped rotary driving web and a radially displaceable locking body. The rotational drive web extends on the receiving side to the receiving side edge of the recess for the locking body over an axial length which corresponds approximately to the guide diameter.

Die US5704744 offenbart eine Werkzeugaufnahme mit mehreren gegenüberliegenden, von einem einheitlichen Führungsdurchmesser einer hohlzylinderförmigen Aufnahmehülse radial nach Innen einkragenden, leistenförmigen Drehmitnahmestegen unbestimmter axialer Länge mit Kontaktflächen und einem durch eine Ausnehmung der Aufnahmehülse im Axialbereich des Führungsdurchmessers hindurch radial versetzbaren Verriegelungskörper.The US5704744 discloses a tool holder with a plurality of opposite, of a uniform guide diameter of a hollow cylindrical receiving sleeve radially inwardly projecting, strip-shaped rotary driving webs of indefinite axial length with contact surfaces and a through a recess of the receiving sleeve in the axial region of the guide diameter through radially displaceable locking body.

Die US5326199 offenbart eine Werkzeugaufnahme mit zwei gegenüberliegenden, von einem antriebsseitig engeren Führungsdurchmesser einer hohlzylinderförmigen Aufnahmehülse radial nach Innen einkragenden, leistenförmigen Drehmitnahmestegen mit Kontaktflächen und einem durch eine Ausnehmung der Aufnahmehülse im Axialbereich des Führungsdurchmessers hindurch radial versetzbaren Verriegelungskörper, wobei aufnahmeseitig in einem wesentlich radial erweiterten Hülsenbereich mehrere Zusatzdrehmitnahmestege anordnet sind.The US5326199 discloses a tool holder with two opposite, of a drive side narrower guide diameter of a hollow cylindrical receiving sleeve radially inwardly einkragenden, strip-shaped rotary driving webs with contact surfaces and a radially through a recess of the receiving sleeve in the axial region of the guide diameter radially displaceable locking body, wherein the receiving side in a substantially radially enlarged sleeve area several Zusatzdrehmititgestge are ordered.

Die derzeit bei Bohrhammersystemen weltweit meistgenutzten, praktisch standardisierten Einsteckenden und zugeordneten Werkzeugaufnahmen sind in der US4107949 beschrieben, welche eine aufnahmeseitige, zylindermantelförmige Führungsfläche mit dem Führungsdurchmesser von 10 mm, zum freien Stirnende hin axial geschlossene Verriegelungsnuten und zum freien Stirnende hin axial offene, trapezförmige Drehmitnahmenuten aufweisen. In der zugeordneten Werkzeugaufnahme greift zumindest ein radial versetzbarer Verriegelungskörper in eine Verriegelungsnut ein und begrenzt die axiale Beweglichkeit des Werkzeugs in der Werkzeugaufnahme. Zudem greifen zwei gegenüberliegende Drehmitnahmestege in je eine Drehmitnahmenut des Einsteckendes ein und übertragen über je eine Tangentialkontaktfläche das Drehmoment. Diese Einsteckenden waren ursprünglich für einen Bohrerdurchmesser bis zu 17 mm ausgelegt und sind somit dem Bereich der kleinen, leistungsschwächeren Bohrhämmer mit einer Leistung kleiner 650 W zuzuordnen. Bei derartigen Maschinenleistung - Werkzeug - Kombinationen waren Verschleissprobleme praktisch nicht vorhanden.The currently most widely used in rotary hammer systems worldwide, practically standardized insertion ends and associated tool holders are in the US4107949 described, which have a receiving side, cylinder jacket-shaped guide surface with the guide diameter of 10 mm, axially towards the free end end locking grooves and the free front end axially open, trapezoidal rotary driving grooves. In the associated tool holder engages at least one radially displaceable locking body in a locking groove and limits the axial mobility of the tool in the tool holder. In addition, two opposite Drehmitnahmestege each engage in a rotational drive groove of the insertion and transmit via a respective tangential contact surface torque. These spigot ends were originally designed for a drill bit diameter of up to 17 mm and are therefore to be classified as small, less powerful rotary hammers with a power of less than 650 W. In such machine performance - tool - combinations wear problems were practically absent.

Die zunehmend leistungsstärkeren Handwerkzeugmaschinen, insbesondere Bohrhämmer, gestatten es jedoch inzwischen, in bestimmten Betriebsmodi hohe Drehmomente auf ein Werkzeug zu übertragen. Inzwischen hat sich eine Erweiterung des praktischen Einsatzbereiches dieser Bohrhämmer bis zu einem Bohrerdurchmesser von 30 mm ergeben. Dabei hat sich gezeigt, dass Bohrerdurchmesser über 17 mm vermehrt zu Verschleiss und Schädigungen der Werkzeugaufnahme führen, konkret zu wesentlich höherem Verschleiss der Drehmitnahmestege an den Kontaktflächen. Insbesondere durch die Verfügbarkeit moderner, armierungsfester Hammerbohrer kommt es zudem vermehrt zu Werkzeugblockaden dieser im armierten Bohrloch. Beim Versuch des Nutzers, den Hammerbohrer herauszuziehen, werden auf das Werkzeug mittels einer in sich arretierten Handwerkzeugmaschine hohe Drehmomente aufgebracht und hohe ruckartige Zugkräfte ausgeübt, welche auf das Werkzeug über den aufnahmeseitigen Rand der Ausnehmung für den Verriegelungskörper übertragen werden und beim Überschreiten der zulässigen mehrachsigen Beanspruchung zum Bruch der Aufnahmehülse nahe diesem aufnahmeseitigen Rand führen.The increasingly powerful hand tool machines, especially rotary hammers, however, now allow it to transfer high torques to a tool in certain operating modes. Meanwhile, an extension of the practical application of these rotary hammers has resulted in a drill diameter of 30 mm. It has been shown that drill diameter over 17 mm increasingly lead to wear and damage to the tool holder, concretely to much higher wear of Drehmitnahmestege at the contact surfaces. In particular, due to the availability of modern, hard-proof hammer drill, there are more and more tool blocks in the reinforced hole. When the user tries to extract the hammer drill, high torques are applied to the tool by means of a self-locking hand tool and exerted high jerky tensile forces, which are transmitted to the tool on the receiving side edge of the recess for the locking body and when exceeding the permissible multi-axis stress lead to breakage of the receiving sleeve near this receiving side edge.

Die Aufgabe der Erfindung besteht in der Realisierung einer schädigungs- und verschleissminimierten Werkzeugaufnahme für leistungsstarke Handwerkzeugmaschinen.The object of the invention is to realize a damage and wear minimized tool holder for powerful hand tool machines.

Die Aufgabe wird im Wesentlichen durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of claim 1. Advantageous developments emerge from the subclaims.

So weist eine Werkzeugaufnahme mit mindestens zwei gegenüberliegenden, von einer hohlzylinderförmigen Aufnahmehülse eines Führungsdurchmessers radial nach Innen einkragenden, leistenförmigen Drehmitnahmestegen mit Kontaktflächen wenigstens einen durch eine Ausnehmung der Aufnahmehülse hindurch radial versetzbaren Verriegelungskörper auf, wobei das aufnahmeseitige Ende der Drehmitnahmestege einen Abstand von dem aufnahmeseitigen Rand der Ausnehmung hat, der grösser als das 1,5-fache des Führungsdurchmessers ist.Thus, a tool holder with at least two opposite, of a hollow cylindrical receiving sleeve of a guide diameter radially inwardly projecting, strip-shaped rotary driving webs with contact surfaces on at least one radially displaceable by a recess of the receiving sleeve locking body, wherein the receiving side end of the rotary driving webs a distance from the receiving side edge of the Recess has, which is greater than 1.5 times the guide diameter.

Der bruchmechanisch kritische Axialbereich des sich zu 45° fortsetzenden mehrachsigen Spannungszustandes am aufnahmeseitigen Rand der Ausnehmung erstreckt sich beidseitig etwa zur Hälfte des Führungsdurchmessers. Über die dem Führungsdurchsmesser entsprechende darüber hinaus vorhandene, zusätzlich vorgelagerte Kontaktlänge der Drehmitnahmestege wird bedingt durch die begrenzte Torsionssteifigkeit des Einsteckendes zumindest der wesentliche Teil des Drehmoments ausschliesslich aufnahmeseitig von der Ausnehmung eingeprägt. Der obige bruchmechanisch kritische Axialbereich ist somit notwendig geringeren Belastungen ausgesetzt, wodurch bei gegebener Dauerfestigkeitsgrenze ein höheres Drehmoment schädigungsarm einprägbar ist. Durch die nunmehr wesentlich verlängerte, zusätzlich vorgelagerte Kontaktlänge der Drehmitnahmestege, werden vom Nutzer manuell über die Werkzeugmaschine aufgebrachte ruckartige Zugbelastungen bei gleichzeitig hohem Drehmoment bruchsicher auf das Werkzeug übertragen.The fracture-mechanically critical axial region of the multiaxial stress state continuing at 45 ° on the receiving-side edge of the recess extends approximately on both sides approximately half of the guide diameter. About the guide diameter corresponding beyond existing, additionally upstream contact length of the rotary driving webs is due to the limited torsional stiffness of the insertion at least the essential part of the torque impressed exclusively on the receiving side of the recess. The above fracture mechanics critical axial region is thus exposed to lower loads, which at given Fatigue limit higher torque torque can be impressed damage. Due to the now significantly extended, in addition upstream contact length of the rotary driving webs, the user manually transferred over the machine tool applied jerky tensile loads with high torque shatterproof on the tool.

Vorteilhaft beträgt die Länge der Drehmitnahmestege mindestens das Dreifache des Führungsdurchmessers, wodurch bei gleichem Querschnitt eine grössere Kontaktfläche realisiert wird, welche bei Standardbelastungen zu kleineren Flächenpressungen führt und somit den Verschleiss wesentlich reduziert. Zudem führen die kleineren Flächenpressungen zu geringeren Gleitreibungsverlusten eines zugeordnet in der Aufnahmehülse axial begrenzt frei beweglich geführten Einsteckendes, wodurch die Schlagenergieübertragung verbessert wird.Advantageously, the length of the Drehitnahmestege is at least three times the guide diameter, whereby a larger contact area is realized with the same cross-section, which results in standard loads to smaller surface pressures and thus significantly reduces the wear. In addition, the smaller surface pressures lead to lower sliding friction losses associated with an axially limited freely movable in the receiving sleeve guided insertion end, whereby the impact energy transfer is improved.

Vorteilhaft beträgt der Abstand der Drehmitnahmestege vom aufnahmeseitigen Ende der Aufnahmehülse maximal die Hälfte des Führungsdurchmessers, wodurch die nicht zur Übertragung von Drehmoment nutzbare axiale Führungslänge der Aufnahmehülse beschränkt und somit die Werkzeugaufnahme verkürzt ist.Advantageously, the distance between the Drehitnahmestege from the receiving end of the receiving sleeve is at most half of the guide diameter, which limits the not usable for the transmission of torque axial guide length of the receiving sleeve and thus the tool holder is shortened.

Vorteilhaft liegt betragsmässig die Summe zweier in derselben Drehrichtung orientierten Kontaktflächen im Bereich zwischen der Hälfte und dem Ganzen des Quadrats des Führungsdurchmessers, wodurch die Werkzeugaufnahme auf die für Stahl-Stahl-Kontaktsysteme wie Passfedern empfohlenen zulässige Flächenpressung von 100 - 120 MPa dimensioniert ist.In terms of amount, the sum of two contact surfaces oriented in the same direction of rotation is advantageously in the range between half and the whole of the square of the guide diameter, whereby the tool holder is dimensioned to the permissible surface pressure of 100-120 MPa recommended for steel-steel contact systems such as feather keys.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als Werkzeugaufnahme im Längsschnitt
  • Fig. 2 als Werkzeugaufnahme im Querschnitt
The invention will be explained in more detail with respect to an advantageous embodiment with:
  • Fig. 1 as a tool holder in longitudinal section
  • Fig. 2 as a tool holder in cross section

Nach den Fig. 1 und Fig. 2 weist eine Werkzeugaufnahme 1 einer drehend und schlagend ein Werkzeug 9 antreibenden Werkzeugmaschine 11 genau zwei gegenüberliegende, von einer hohlzylinderförmigen Aufnahmehülse 3 eines Führungsdurchmessers D radial nach Innen mit einer Steghöhe H = 0.15 D einkragende, leistenförmige Drehmitnahmestege 4a, 4b einer Länge L mit radial verlaufenden Kontaktflächen 5 und einen durch eine Ausnehmung 6 der Aufnahmehülse 3 hindurch radial versetzbaren Verriegelungskörper 2 in Form einer Kugel auf. Das aufnahmeseitige Ende der Drehmitnahmestege 4a, 4b hat einen Abstand X von dem aufnahmeseitigen Rand der Ausnehmung 6, der dem Doppelten des Führungsdurchmessers D entspricht. Die Länge L der Drehmitnahmestege 4a, 4b beträgt das Dreifache des Führungsdurchmessers D und der Abstand Y der vom aufnahmeseitigen Ende der Aufnahmehülse 3 beträgt ein Fünftel des Führungsdurchmessers D. Die betragsmässige Summe Σ aller in derselben Drehrichtung ω orientierten Kontaktflächen 5 liegt mit Σ = 2 L H = 2 (3 D) (0.15 D) = 0.9 D^2 im Bereich zwischen der Hälfte und dem Ganzen des Quadrats des Führungsdurchmessers D. Selbst bei einer leistungsstarken Werkzeugmaschine 11 mit einem Drehmoment M bis zu 50.000 Nmm ergibt sich bei einem Führungsdurchmesser D = 10 mm näherungsweise nur eine Flächenpressung P = M / (D L H) = M / 0.45 D^3 = 111 MPa, die in den empfohlenen Grenzen bleibt. Bei hohen Drehmomenten wie im Fall einer Werkzeugblockade wird durch die begrenzte Torsionssteifigkeit eines Einsteckendes 12 des Werkzeugs 9 im wesentlichen nur die aufnahmeseitig vor dem mehrachsigen Spannungszustand S zusätzlich vorgelagerte Kontaktlänge K = D = 10 mm beansprucht.After the Fig. 1 and Fig. 2 has a tool holder 1 of a rotating and hitting a tool 9 driving machine tool 11 exactly two opposite, of a hollow cylindrical receiving sleeve 3 of a guide diameter D radially inwardly with a web height H = 0.15 D einkragende, strip-shaped Drehmitnahmestege 4a, 4b a length L with radially extending contact surfaces 5 and a through a recess 6 of the receiving sleeve 3 through radially displaceable locking body 2 in the form of a ball. The receiving-side end of the rotary driving webs 4a, 4b has a distance X. from the receiving side edge of the recess 6, which corresponds to twice the guide diameter D. The length L of the Drehitnahmestege 4a, 4b is three times the guide diameter D and the distance Y of the receiving side end of the receiving sleeve 3 is one fifth of the guide diameter D. The absolute value Sum Σ all oriented in the same direction of rotation ω contact surfaces 5 is Σ = 2 LH = 2 (3 D) (0.15 D) = 0.9 D ^ 2 in the range between half and the whole of the square of the guide diameter D. Even with a high-performance machine tool 11 having a torque M of up to 50,000 Nmm, a guide diameter D = 10 mm approximately only one surface pressure P = M / (DLH) = M / 0.45 D ^ 3 = 111 MPa, which remains within the recommended limits. At high torques, such as in the case of a tool blockage, the limited torsional rigidity of an insertion end 12 of the tool 9 essentially requires only the contact length K = D = 10 mm upstream of the multi-axial stress state S on the receiving side.

Claims (4)

  1. A chuck having at least two ridge-like rotary driving flanges (4a, 4b) located opposite one another and projecting radially inwards from a guide diameter (D) of a hollow cylindrical receiving sleeve (3), said rotary driving flanges (4a, 4b) having contact surfaces (5) and at least one locking member (2) which can be displaced in radial direction through an opening (6) formed in the receiving sleeve (3) in an axial region of constant guide diameter (D), characterized in that the ends of the rotary driving flanges (4a, 4b) on the receiving side are at a distance (X) from the edge of the opening (6) on the receiving side, which is greater than 1.5 times the guide diameter (D), in that the distance (Y) of the rotary driving flanges (4a, 4b) from an edge of the receiving sleeve (3) on the receiving side is less than a distance (X+Y) of the opening (6) from the edge of the receiving sleeve (3) on the receiving side, and in that the rotary driving flanges (4a, 4b) extend in axial direction of the receiving sleeve (3) beyond the openings.
  2. A chuck according to Claim 1, characterized in that the length (L) of the rotary driving flanges (4a, 4b) is at least three times the guide diameter (D).
  3. A chuck according to Claim 1 or 2, characterized in that the distance (Y) of the rotary driving flanges (4a, 4b) from the end of the receiving sleeve (3) on the receiving side is at most half the guide diameter (D).
  4. A chuck according to one of Claims 1 to 3, characterized in that, in terms of absolute value, the sum of two contact surfaces (5) oriented in the same direction of rotation (ω) is in the region of between half and the whole of the square of the guide diameter (D).
EP05110009A 2004-11-12 2005-10-26 Tool holder Not-in-force EP1657013B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004054685A DE102004054685A1 (en) 2004-11-12 2004-11-12 tool holder

Publications (2)

Publication Number Publication Date
EP1657013A1 EP1657013A1 (en) 2006-05-17
EP1657013B1 true EP1657013B1 (en) 2010-10-20

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US (1) US8066290B2 (en)
EP (1) EP1657013B1 (en)
JP (1) JP2006136999A (en)
CN (1) CN1772424B (en)
AT (1) ATE485119T1 (en)
AU (1) AU2005227367A1 (en)
DE (2) DE102004054685A1 (en)
TW (1) TW200621405A (en)
ZA (1) ZA200509149B (en)

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US20060103082A1 (en) 2006-05-18
CN1772424B (en) 2012-05-02
ZA200509149B (en) 2006-08-30
DE102004054685A1 (en) 2006-05-18
AU2005227367A1 (en) 2006-06-01
CN1772424A (en) 2006-05-17
ATE485119T1 (en) 2010-11-15
US8066290B2 (en) 2011-11-29
JP2006136999A (en) 2006-06-01
EP1657013A1 (en) 2006-05-17
TW200621405A (en) 2006-07-01
DE502005010407D1 (en) 2010-12-02

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