EP1920887A1 - Outil avec mécanisme à coup hydraulique - Google Patents

Outil avec mécanisme à coup hydraulique Download PDF

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Publication number
EP1920887A1
EP1920887A1 EP06023566A EP06023566A EP1920887A1 EP 1920887 A1 EP1920887 A1 EP 1920887A1 EP 06023566 A EP06023566 A EP 06023566A EP 06023566 A EP06023566 A EP 06023566A EP 1920887 A1 EP1920887 A1 EP 1920887A1
Authority
EP
European Patent Office
Prior art keywords
tool
piston
hydraulic cylinder
hydraulic
volume
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
EP06023566A
Other languages
German (de)
English (en)
Other versions
EP1920887B1 (fr
Inventor
Konrad Karl Kettner
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.)
Apex Tool Group GmbH and Co OHG
Original Assignee
Cooper Power Tools GmbH and Co OHG
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 Cooper Power Tools GmbH and Co OHG filed Critical Cooper Power Tools GmbH and Co OHG
Priority to DE502006005743T priority Critical patent/DE502006005743D1/de
Priority to EP06023566A priority patent/EP1920887B1/fr
Priority to ES06023566T priority patent/ES2338690T3/es
Priority to AT06023566T priority patent/ATE452731T1/de
Priority to US11/939,307 priority patent/US7647986B2/en
Publication of EP1920887A1 publication Critical patent/EP1920887A1/fr
Application granted granted Critical
Publication of EP1920887B1 publication Critical patent/EP1920887B1/fr
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
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • 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
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B25B23/1453—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers for impact wrenches or screwdrivers

Definitions

  • the invention relates to a tool and in particular a screwdriver, with a hydraulic impact mechanism and a drive unit, wherein a working volume within the hydraulic impact mechanism can be connected to an additional volume formed outside this.
  • Such a tool is from the DE 202 10 453 U1 (Cooper ), wherein the working volume is connected within the hydraulic impact mechanism with an additional volume within the hydraulic cylinder through a small bore which is closed during the pulse of a blade.
  • a sealed with O-ring lid closes the hydraulic cylinder and thereby defines the entire working volume of the impulse unit, as it is not adjustable for the setting of different working volumes.
  • a spacer presses the lid against the cylinder wall and a retaining ring fixes the lid permanently. Due to the fixed mounting position of the locking ring and the distance between the hydraulic cylinder and the lid and thus the working volume is fixed and unchangeable.
  • the space for the working fluid is not adjustable, and the required amount of the working fluid can be done only by the addition or removal via a filling opening.
  • the chamber is first completely filled with a working fluid and then the removal is done with syringes, which pull the fluid from the interior until a desired volume is reached.
  • This filling process is very complex and imprecise. Furthermore, a change in the workload is not possible.
  • a tool showing a screwdriver having a motor that rotates a drive member within a fluid chamber, the drive member being provided with a variable volume fluid collection chamber.
  • the collection chamber takes the additional Fluid volume on.
  • the collection chamber returns the fluid to the fluid chamber.
  • the compensation is provided by an elastically deformable membrane, which consists of two areas. The first region communicates with the fluid chamber via a channel and the second membrane layer is intended to protect against destruction by the chemically aggressive hydraulic fluid.
  • the volume increase within the fluid collection chamber leads to a deformation of the membrane and thus to an increase in the working volume.
  • the excess fluid previously entering the collection chamber returns to the collection chamber via the channel and the membrane is relieved.
  • the working volume can therefore only be changed depending on the pressure of the working fluid. A targeted volume adjustment is not possible.
  • a tool of the type mentioned in such a way that the working volume within the hydraulic impact mechanism without regard to the consistency of the working fluid and is adjustable at any time.
  • a tool having a hydraulic impact mechanism with a working volume and an additional volume formed outside this hydraulic impact mechanism wherein at least the additional volume is variable so that it does not depend on the consistency of the working fluid and not on the pressure ratios within the hydraulic impact mechanism. Rather, the adjustment of the additional volume takes place independently of the ambient conditions. Thus, a change in the additional volume can be performed if the pressure conditions have not changed due to the operations within the pulse unit. Likewise, a change in the equalizing volume may occur as the volume of the working fluid changes. And further, an adjustment of the additional volume can be made, although the volume of the working fluid has changed.
  • a particularly advantageous embodiment of the invention provides that the hydraulic impact mechanism between the drive unit and a tool holder is arranged to ensure a low-loss power transmission as possible. Furthermore, can be designed particularly advantageous by this arrangement, the size of the tool.
  • the hydraulic impact mechanism may have a one-sided limiting adjustment means.
  • the hydraulic impact mechanism is closed at least on one side with a means that is adjustable or adjustable.
  • the additional volume can be increased and / or reduced with the adjusting means.
  • the precise volume requirements of the user for the reserve oil, oil balance and pulse frequency change can be time-saving set to a required size.
  • the adjustment means may be a manually adjustable piston.
  • This embodiment ensures a rapid change of the additional volume within the hydraulic impact mechanism.
  • the adjustable piston has a particularly advantageous for the manual operation surface, which prevents by their rough nature slipping of the fingers or the hand. This can e.g. be realized by a knurling or with a grip-safe additionally applied surface coating or other suitable means.
  • the piston may be adjustable relative to the hydraulic cylinder via an external and / or internal thread.
  • the adjustment via a thread offers a particularly precise way to adjust the translational travel and thus the volume change within the hydraulic impact mechanism.
  • the use of an external and / or internal thread increases the possible applications and adapts the piston to the different installation conditions.
  • the thread is a fine thread with which due to the small thread pitch even the smallest changes in volume can be realized.
  • the additional volume between the hydraulic cylinder and the piston may be arranged. This construction ensures a direct influence on the volume when the hydraulic cylinder or piston is adjusted.
  • the piston for the volume change relative to the tool via a thread can be adjusted.
  • a fine adjustment of the piston can take place and also precise volume changes can be carried out in small steps.
  • the piston can be made of a resilient, stiff and low-mass material.
  • hard anodized aluminum provides favorable characteristics for use of the piston in a pressurized and oil wetted environment. Even external loads can be absorbed very well by a piston made of coated aluminum.
  • the piston may be sealed relative to the hydraulic cylinder with O-rings. These seals offer a good seal of the piston, especially in the pressurized and oil-wetted environment. Other suitable seals can be used.
  • the piston can be fixed in at least one rotational position.
  • the piston can be fixed after it has reached the desired setting position. An undesirable displacement during use of the tool is thereby prevented.
  • the hydraulic cylinder may have at least four offset by 90 ° arranged fixed rotational positions. By arranging at least four rotational positions, a sufficient, flexible fixing possibility can be provided.
  • more grooves on the piston are possible, advantageously an odd number to the number of slots on the hydraulic cylinder, e.g. 3 to 4 results in 12 positioning options per revolution of the piston.
  • the piston can be fixed in at least one rotational position with the hydraulic cylinder connecting.
  • the piston can be fixed in at least one rotational position with the hydraulic cylinder by means of a locking element.
  • the locking element is a particularly reliable anti-rotation.
  • the locking element may be a pin, sleeve or threaded pin. Due to its high shearing resistance as well as the simple and quick installation, this can be a good fixation option.
  • the piston for volume change with an auxiliary tool can be rotated several times.
  • the tool is particularly easy to transfer the force required for the rotation of the piston.
  • a tool can also be used in hard to reach mounting situations.
  • the piston may have a substantially L-shaped profile. As a result, the weight of the piston can be reduced and a smaller design can be realized.
  • the piston may have an outer leg, which forms a chamber for reserve oil with the outer surface of the hydraulic cylinder.
  • the chamber for the reserve oil can be molded with few components. The entire assembly can be made very small by this compact arrangement.
  • the piston can have an internal thread, which essentially corresponds to the external thread of the hydraulic cylinder.
  • an internal thread which essentially corresponds to the external thread of the hydraulic cylinder.
  • the piston may have two different sized cylindrical inner diameter.
  • the piston can be adapted to the shape of the hydraulic cylinder and represents a particularly space-saving installation variant.
  • At least one of the inner diameter of the piston may have a groove for an O-ring.
  • At least one of the inner diameter of the piston may have a running surface for an O-ring. This allows a built-O-ring fit particularly well on the inner diameter and seal the system.
  • the piston may have at least one receiving opening for the locking element.
  • the locking element can be placed securely and secure the piston against rotation.
  • the piston can be factory preset to a predetermined number of pulses, which is for example 10 to 40 Hz. This allows the user of the tool to adjust the pulse frequency range to their own needs.
  • the piston can be fixed relative to the hydraulic cylinder with the locking element after setting the number of pulses.
  • the preset number of pulses of preferably 30 Hz can be securely fixed and secured against undesired adjustment.
  • FIG. 1 shows a schematic side view of a tool 1, which has a drive unit 24, a hydraulic impact mechanism 7 connected thereto and an output.
  • the drive unit 24 is a conventional motor with compressed air supply.
  • a valve allows the pressure to be switched on individually by the user.
  • the hydraulic impact mechanism consists essentially of a hydraulic rotor 26, a hydraulic cylinder 11 and hydraulic blades 23, which are driven together by a pneumatic motor as the drive unit 24.
  • a pneumatic motor as the drive unit 24.
  • the hydraulic rotor 26 By located in a pulse chamber 18 of the hydraulic cylinder pressure medium, such as hydraulic oil, the hydraulic rotor 26 is taken with the tool holder 25 rotating. This will screw a bolt or nut into a component.
  • the hydraulic rotor 26 and the hydraulic cylinder 11 is rotated further by the drive unit 24.
  • the hydraulic rotor 26 experiences a counterforce. To tighten the screw or nut, it is now necessary that the hydraulic rotor 26 continues to apply torque to the screw.
  • the pulse unit 6 has a hydraulic impact mechanism 7, which has four sealing areas on the hydraulic cylinder 11 and four fins 23 on the hydraulic rotor 26.
  • the lamellae 23 fastened in the cylinder 11 at the web-shaped sealing regions 9 of the hydraulic cylinder 11 seal the four spaces formed in the pulse chamber 18.
  • Two opposite rooms are high pressure chambers and the other two opposite rooms are low pressure chambers.
  • the resulting pressure acts on the slats 23 and generates a hydraulic pulse, which occurs in rapid succession by the motor rotation and corresponds to the hitting of a mechanical impact wrench.
  • the drive unit 24 must again accelerate the hydraulic cylinder 11 for the next pulse over a full revolution. In order for the pulses to be able to reach each other quickly, a short transit time of the sealing regions 9 after the last impulse applied is necessary.
  • a connection to the additional volume is sealed by a lamella during the pulse phase, see FIG. 2.
  • FIG. 2 shows a sectional view of the hydraulic impact mechanism 7 with a drive spindle 26 which extends from the drive unit 24 through the hydraulic impact mechanism 7.
  • the lateral cover of the hydraulic impact mechanism 7 takes place on the output side of the hydraulic rotor 26 through a bearing cap 27, which has a filling opening for the hydraulic oil.
  • the other side of the hydraulic impact mechanism 7 is closed by a rotatable piston 2.
  • the assembly of the pulse unit 6 before introduction into the screwdriver 1 proceeds as follows.
  • the already assembled hydraulic impact mechanism 7 is closed on one side with the bearing cap 27 and on the other side with the rotatable piston 2 and the round O-rings 13, 14 associated therewith.
  • the rotatable piston 2 Before filling the pulse unit 6 with the working fluid, the rotatable piston 2 is screwed axially onto the hydraulic cylinder 11 until it reaches the stop position. If the piston is rotated counterclockwise before filling, for example 1 turn when filling this additional volume also filled with working fluid and is available as a useful reserve fluid later when needed. Then the working fluid, in particular hydraulic oil, can be introduced through the filling opening into the pulse unit 6. If the working volume within the pulse unit 6 has been completely filled with hydraulic oil, the filling opening in the bearing cap 27 is firmly closed. Within the pulse unit 6 is now no more air.
  • the size of the chamber can be increased and reduced in limits by turning the piston 2.
  • the additional volume goes to zero when the piston abuts the end face of the hydraulic cylinder 11 and reaches its maximum volume when it is axially displaced so far from the end face of the hydraulic cylinder 11 until the last possible sealing position is reached.
  • This sealing position is determined by the O-ring 13 on the outer periphery of the hydraulic cylinder 11.
  • a stop limits the axial movement possibility.
  • the working fluid within the hydraulic impact mechanism 7 heats up and expands. If no sufficiently large additional volume is made available, the pulse unit will possibly stop until the working fluid has cooled down again and the entire working fluid has been reduced.
  • the rotatable piston 2 With the rotatable piston 2, the necessary additional volume is provided.
  • the piston is rotated counterclockwise and by the axial displacement increases the space between the end faces of the piston 2 and the hydraulic cylinder 11. As can be seen in Fig. 5, thus, the fluid compensation volume can be adjusted.
  • the tool can be factory filled with working fluid so that it reaches a pulse frequency of about 30 Hz.
  • the reduction of the pulse frequency due to the heating of the working fluid can be counteracted be rotated by the rotatable piston 2 counterclockwise and thus the additional volume 4 is increased.
  • a locking element 15 which is in particular a pin, sleeve or a threaded pin, inserted for axial securing between the hydraulic cylinder 11 and the rotatable piston 2. This locks the two parts together.
  • Another O-ring can additionally secure the inserted locking element axially.
  • the adjustment of the rotatable piston 2 to increase the additional volume 5 and thereby increasing the pulse frequency can be carried out as often, until the additional volume is either too large and the working fluid thereby does not provide enough pressure for the pulse structure or the rotatable piston due to its dimensions pushes its limits.
  • the reserve oil must be activated and the piston 2 rotated clockwise so that it shifts axially on the hydraulic cylinder 11 ,
  • the elastic ring 22 and the locking element 15 of the piston must first be removed and after the adjustment has been completed both are reused.
  • the axial rotation of the rotatable piston 2 can also be performed with other axially or radially arranged fastening means, such as a split pin.
  • the axial displacement of the rotatable piston 2 is also possible by other suitable measures, such as a splined connection.
  • suitable measures such as a splined connection.
  • all other sliding seals can be used instead of O-rings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Road Repair (AREA)
EP06023566A 2006-11-13 2006-11-13 Outil avec mécanisme à coup hydraulique Not-in-force EP1920887B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE502006005743T DE502006005743D1 (de) 2006-11-13 2006-11-13 Werkzeug mit einem Hydraulikschlagwerk
EP06023566A EP1920887B1 (fr) 2006-11-13 2006-11-13 Outil avec mécanisme à coup hydraulique
ES06023566T ES2338690T3 (es) 2006-11-13 2006-11-13 Herramienta con mecanismo hidraulico de percusion.
AT06023566T ATE452731T1 (de) 2006-11-13 2006-11-13 Werkzeug mit einem hydraulikschlagwerk
US11/939,307 US7647986B2 (en) 2006-11-13 2007-11-13 Tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06023566A EP1920887B1 (fr) 2006-11-13 2006-11-13 Outil avec mécanisme à coup hydraulique

Publications (2)

Publication Number Publication Date
EP1920887A1 true EP1920887A1 (fr) 2008-05-14
EP1920887B1 EP1920887B1 (fr) 2009-12-23

Family

ID=37908063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06023566A Not-in-force EP1920887B1 (fr) 2006-11-13 2006-11-13 Outil avec mécanisme à coup hydraulique

Country Status (5)

Country Link
US (1) US7647986B2 (fr)
EP (1) EP1920887B1 (fr)
AT (1) ATE452731T1 (fr)
DE (1) DE502006005743D1 (fr)
ES (1) ES2338690T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020148178A1 (fr) 2019-01-17 2020-07-23 cutpack.com GmbH Dispositif de serrage
WO2021151668A1 (fr) 2020-01-31 2021-08-05 cutpack.com GmbH Dispositif de serrage permettant de serrer une pièce à travailler

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE506143T1 (de) * 2006-11-13 2011-05-15 Cooper Power Tools Gmbh & Co Impulswerkzeug und zugehörige vorderplatte
US9878435B2 (en) 2013-06-12 2018-01-30 Makita Corporation Power rotary tool and impact power tool
WO2014198679A2 (fr) * 2013-06-12 2014-12-18 Atlas Copco Industrial Technique Ab Procédé pour diagnostiquer un générateur d'impulsion de couple
TWI498194B (zh) * 2014-05-30 2015-09-01 Tranmax Machinery Co Ltd Impact drive
TWM562747U (zh) * 2016-08-25 2018-07-01 米沃奇電子工具公司 衝擊工具
JP6762572B2 (ja) * 2017-08-31 2020-09-30 瓜生製作株式会社 油圧式トルクレンチの打撃トルク発生装置

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Publication number Priority date Publication date Assignee Title
EP0292752A2 (fr) * 1987-05-26 1988-11-30 Deutsche Gardner-Denver GmbH & Co Clé à impulsion hydraulique
EP0309625A1 (fr) * 1987-09-29 1989-04-05 Nippon Pneumatic Manufacturing Co. Ltd. Clés à écrous à impulsion hydraulique
US5611404A (en) * 1995-09-28 1997-03-18 Gpx Corp. Hydraulic impulse tool with enhanced fluid seal
EP0885693A2 (fr) * 1997-06-09 1998-12-23 Atlas Copco Tools Ab Générateur hydraulique d'impulsion de couple
DE20210453U1 (de) * 2002-07-05 2003-11-13 Cooper Power Tools GmbH & Co., 73463 Westhausen Impulseinheit

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Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0292752A2 (fr) * 1987-05-26 1988-11-30 Deutsche Gardner-Denver GmbH & Co Clé à impulsion hydraulique
EP0309625A1 (fr) * 1987-09-29 1989-04-05 Nippon Pneumatic Manufacturing Co. Ltd. Clés à écrous à impulsion hydraulique
US5611404A (en) * 1995-09-28 1997-03-18 Gpx Corp. Hydraulic impulse tool with enhanced fluid seal
EP0885693A2 (fr) * 1997-06-09 1998-12-23 Atlas Copco Tools Ab Générateur hydraulique d'impulsion de couple
DE20210453U1 (de) * 2002-07-05 2003-11-13 Cooper Power Tools GmbH & Co., 73463 Westhausen Impulseinheit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020148178A1 (fr) 2019-01-17 2020-07-23 cutpack.com GmbH Dispositif de serrage
WO2021151668A1 (fr) 2020-01-31 2021-08-05 cutpack.com GmbH Dispositif de serrage permettant de serrer une pièce à travailler

Also Published As

Publication number Publication date
DE502006005743D1 (de) 2010-02-04
EP1920887B1 (fr) 2009-12-23
US20080110656A1 (en) 2008-05-15
ATE452731T1 (de) 2010-01-15
US7647986B2 (en) 2010-01-19
ES2338690T3 (es) 2010-05-11

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