EP3250344A1 - Percussion mechanism device, in particular for an impact wrench - Google Patents
Percussion mechanism device, in particular for an impact wrenchInfo
- Publication number
- EP3250344A1 EP3250344A1 EP15820867.8A EP15820867A EP3250344A1 EP 3250344 A1 EP3250344 A1 EP 3250344A1 EP 15820867 A EP15820867 A EP 15820867A EP 3250344 A1 EP3250344 A1 EP 3250344A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ball
- hammer
- guide groove
- impact
- drive shaft
- 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
Links
- 238000009527 percussion Methods 0.000 title claims abstract description 22
- 238000010009 beating Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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
- B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
-
- 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
- B25B21/026—Impact clutches
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/10—Means for driving the impulse member comprising a cam mechanism
- B25D11/102—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool
- B25D11/104—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool with rollers or balls as cam surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D16/003—Clutches specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/06—Means for driving the impulse member
- B25D2211/062—Cam-actuated impulse-driving mechanisms
- B25D2211/065—Cam-actuated impulse-driving mechanisms with ball-shaped or roll-shaped followers
-
- 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
- B25D2217/0003—Details of shafts of percussive tool bits
Definitions
- EP 2168725 A1 is already a percussion device for an impact wrench, with a drivable drive shaft having a guide groove, with an output shaft and a beating unit, which rotatably coupled to the output shaft anvil, a hammer and a ball, wherein the hammer is mounted on the drive shaft via the ball along the guide groove known.
- the ball and the groove are easily deformed at a contact surface in operation.
- the invention relates to a percussion device, in particular for an impact wrench, with a drivable drive shaft, which has at least one guide groove, with an output shaft and with a beating unit which comprises a non-rotatably coupled to the output shaft anvil, a hammer and at least one ball, wherein the hammer is mounted on the at least one ball along the at least one guide groove on the drive shaft.
- the hammer comprises an at least partially concave curved ball guide surface having at a radially inner point an axial distance to at least one ball, which is greater than a radial distance between the at least one ball and a radially inner point of a concave ball guide surface of the at least one guide groove ,
- This can advantageously a larger contact surface between the at least one ball and the at least one guide groove can be achieved.
- a pressure acting on the at least one ball can advantageously spread over a particularly large area.
- a deformation of the at least one ball can advantageously be kept low.
- a contact surface between the at least one ball and the at least one guide groove can be increased particularly advantageously by about 30%.
- a lifetime of the percussion device can be advantageously extended.
- a particularly high impact force can be achieved.
- a "ball guide surface” should be understood as meaning, in particular, a surface intended to guide the at least one ball
- the at least one ball guide surface of the guide groove has a continuous curvature. rungsnut free of inflection points and / or flat surfaces.
- a "radial distance” is to be understood as meaning, in particular, a distance in a radial direction.
- a radial direction is to be understood in this context in particular as meaning a direction perpendicular to the axial direction of the drive shaft.
- axial distance is to be understood as meaning, in particular, a distance in an axial direction.
- An axial direction “is to be understood in this context, in particular a direction which runs parallel to a main direction of rotation of the drive shaft.
- a "radially innermost point” is to be understood as meaning, in particular, a point at which a main axis of rotation, about which the drive shaft executes a main rotational movement in one operating state, at the following point. th and / or is closest to a rotational symmetry axis of the hammer and / or the drive shaft.
- the at least one ball forms a steel ball.
- the at least one guide groove forms a V-shaped groove.
- the attachment unit preferably exerts a force on the at least one ball in the direction of a main axis of rotation about which the drive shaft executes a main rotational movement in an operating state.
- the pressing unit is provided for pressing the at least one ball into the at least one guide groove such that a contact surface extends over at least 2% of a ball circumference of the ball.
- a system pressure between the ball and the at least one guide groove can advantageously be reduced.
- the contact surface extends over at least 5%, more preferably over 10%, most preferably over 20%, further preferably over 24% of a ball circumference of the ball.
- a "ball circumference” is to be understood as meaning, in particular, a length of an imaginary great circle of the ball.
- a contact surface is to be understood in this context to be a surface on which contact between the at least one ball and the at least one guide groove exists ,
- the pressing unit comprises a cylindrical inner wall, which is provided for pressing the at least one ball, wherein a diameter of the inner wall at least substantially a double ball diameter plus a smallest possible thickness of the Drive shaft corresponds in the region of at least one guide groove.
- the pressing unit can be made structurally particularly simple.
- a ratio between twice the ball diameter plus a smallest possible thickness of the drive shaft and the diameter of the inner wall in the region of the at least one guide groove is greater than 0.99, particularly preferably greater than 0.999 and very particularly preferably greater as 0.9999.
- the at least one ball guide surface of the hammer is provided for transmitting a radial contact pressure force to the at least one ball.
- a pressing of the at least one ball can be done in a particularly simple manner.
- Hammers is preferably formed concave curved.
- the impact mechanism device has at least one spring force element which is provided for the exercise of the radial contact pressure on the at least one ball on the at least one ball guide surface of the hammer.
- the spring force element preferably forms a helical spring.
- the spring force element is preferably provided to exert a parallel to the main direction of rotation of the drive shaft extending spring force on the hammer relative to the drive shaft.
- the hammer comprises a ball guide surface which, viewed in the circumferential direction, has at least one axial elevation.
- a particularly low-wear coupling of the drive shaft can be achieved relative to the hammer in a non-impact operation.
- at least two axial elevations form a central depression of the ball guide surface of the hammer.
- the ball guide surface of the hammer forms at least two convex partial surfaces, which extend over a concave partial surface. surface are interconnected.
- the drive shaft comprises at least two guide grooves and that the impact unit has at least two balls, which are mounted at least in an operating state within the at least two guide grooves.
- a contact pressure can advantageously be distributed over a particularly large contact area.
- the at least two guide grooves are arranged offset in the circumferential direction by 180 ° to each other.
- the at least one guide groove has a semicircular groove base.
- a particularly large contact surface between the at least one ball and the at least one guide groove can be achieved.
- a radial extent of the at least one guide groove is greater than a spherical radius of the at least one ball.
- an impact wrench is proposed with an impact mechanism according to the invention.
- the impact wrench is advantageously designed battery operated.
- the impact wrench particularly preferably forms a rotary impact wrench or a cordless impact wrench.
- the impact mechanism according to the invention should not be limited to the application and embodiment described above.
- the percussion mechanism according to the invention may have a number deviating from a number of individual elements, components and units mentioned herein.
- Fig. 1 is a schematic side view of a impact wrench with a
- FIG. 3 shows a drive shaft of the impact mechanism in a detail view
- FIG. 4 shows a diagram with information about a contact force in relation to an axial offset
- Fig. 5 is a detail view of the drive shaft, a hammer of Schlagtechnikvorraum and two balls.
- the impact wrench 10 has a housing 64 with a handle 66.
- the impact wrench 10 has a hammer mechanism.
- the impact wrench 10 is mechanically and electrically connected to an accumulator 68 for mains-independent power supply.
- the impact wrench 10 is exemplified as Akku- rotary impact wrench. It should be noted, however, that the present invention is not limited to cordless rotary impact wrenches, but rather can be used in different embodiments of impact wrenches, regardless of whether the corresponding impact wrench is network-independent or network-dependent operable. In addition, it should be understood that the present invention is not limited to motor powered impact wrenches but is generally applicable to tools to which the percussion mechanism illustrated in the following figures may find application.
- the hammer mechanism is disposed within the housing 64. Furthermore, an electric drive motor 70 supplied with power by the accumulator 68, a gear 72 and a striking unit 20 of the percussion mechanism are arranged in the housing 64.
- the drive motor 70 can be actuated, for example, via a manual switch 74, that is, switched on and off.
- the drive motor 70 may be any type of engine, e.g. As an electronically commutated motor or a DC motor.
- the drive motor 70 is so electronically controlled and / or regulated that both a reversing operation and specifications with respect to a desired rotational speed can be adjusted.
- the mode of operation and the construction of a suitable drive motor 70 are sufficiently known from the prior art, so that a more detailed description is dispensed with.
- the drive motor 70 is connected via an associated motor shaft 76 to the gear 72, which converts a rotation of the motor shaft 76 into a rotation of a provided between the gear 72 and beating unit 20 drivable drive shaft 12 of the percussion device. This conversion preferably takes place in such a way that the drive shaft 12 rotates relative to the motor shaft 76 with an increased rotational torque but a reduced rotational speed.
- the Schlagtechnikvorraum forms a rotary and / or rotary impact.
- the beating unit 20 is intended to generate sudden high-intensity rotational pulses and to transmit them to an output shaft 18 of the percussion mechanism.
- a tool holder 78 Provided on the output shaft 18 is a tool holder 78, which is intended for
- the tool holder 78 is both with an insert tool with external coupling, z. B. a screwdriver bit, as well as with an insert tool with internal coupling, z. B. a socket, connectable.
- the tool holder 78 is connectable to an insert tool 80 with external polygon coupling.
- the drive shaft 12 has two guide grooves 14, 16.
- the guide grooves 14, 16 each have a semicircular groove bottom 62, 82.
- the respective groove bottom 62, 82 deviates from an exact semicircle.
- the impact unit 20 has two balls 26, 28, which are each guided in one of the guide grooves 14, 16.
- the guide grooves 14, 16 thus each form a ball guide surface 52, 84.
- the balls 26, 28 are formed by steel balls.
- a radius of curvature of the respective groove bottom 62, 82 is slightly larger than a ball radius of the balls 26, 28. In other words, a radial extent of the respective guide groove 14, 16 is greater than a ball radius of the respective ball 26, 28.
- the balls 26, 28 are thus theoretically at only one point on the ball guide surfaces 52, 84.
- the grooves 14, 16 extend in a main extension both in an axial direction 54 of the drive shaft 12 and in a circumferential direction 60 of the drive shaft 12.
- the respective groove 14, 16 in the respective main extension to a V-shape.
- the axial direction 54 is parallel to a main direction of rotation of the drive shaft 12. Since the guide grooves 14, 16 and the balls 26, 28 are the same, in the following, for the sake of simplicity, only the formation of the area around the upper guide groove 14 shown in FIG and the ball 26
- the impact unit 20 For transmitting impacts, the impact unit 20 has an anvil 22 rotatably coupled to the output shaft 18.
- the anvil 22 extends in this view perpendicular to the section plane and is therefore not completely visible.
- the beating unit 20 comprises a hammer 24.
- the hammer 24 is cylindrical. Further, the hammer 24 and the drive shaft 12 are arranged coaxially with each other. The output shaft 18 and the drive shaft 12 are arranged coaxially with each other.
- the hammer 24 is mounted on the drive shaft 12 via the ball 26 along the guide groove 14.
- the hammer 24 is limited relative to the drive shaft 12 in the axial direction 54 movable.
- the hammer 24 is limited to rotate relative to the drive shaft 12 limited by a parallel to the axial direction 54 extending main axis of rotation.
- the hammer 24 has a ball guide surface 44.
- the ball guide surface 44 is partially concave curved.
- a radius of curvature of the ball guide surface 44 is greater than a ball radius of the ball 26.
- the ball 26 is thus theoretically at only one contact point on the ball guide surface 44 of the hammer 24.
- the ball 26 is movably mounted within the guide groove 14.
- the percussion device comprises a pressing unit 30, which is provided for the radial pressing of the ball 26 in the direction of the guide groove 14. This results from a deformation of the ball 26 and the guide groove 14, a contact surface 32 to the theoretical contact point.
- the pressing unit 30 is provided to press the ball 26 into the guide groove 14 such that the contact surface 32 extends over at least 2% of a ball circumference of the ball 26.
- the pressing unit 30 comprises a cylindrical inner wall 34, which is provided for pressing the ball 26.
- a diameter 36 of the inner wall 34 corresponds essentially to a double ball diameter 38 of the ball 26 plus a smallest possible thickness 40 of the drive shaft 12 in the region 42 of the guide groove 14. More specifically, the diameter 36 is less than 5 ⁇ greater than the double ball diameter 38 of the ball 26 plus the smallest possible thickness 40 of the drive shaft 12 in the region 42 of the guide groove 14. A ratio between the double ball diameter 38 plus the smallest possible thickness 40 of the drive shaft 12 and the diameter 36 of the inner wall 34 in the region 42 of the guide groove 14th is greater than 0.9999.
- FIG. 4 shows a profile of a total force which arises due to the contact of the ball 26 in the guide groove 14 in relation to an axial offset.
- the ordinate axis represents the total force.
- the axis of abscissa represents the axial displacement of the hammer 24 in one operation.
- the progression of the total force from a known percussion device is shown in the upper line 86. Due to the small contact surface in the prior art, overall higher loading forces result than in the lower line 88, which represents the total force in the impact mechanism according to the invention.
- the percussion device has a spring force element 58.
- the spring force element 58 is provided for exerting the radial contact pressure on the ball 26 via the ball guide surface 44 of the hammer 24.
- the spring force element 58 forms a helical spring.
- the spring force element 58 is provided to exert a parallel to the axial direction 54 of the drive shaft 12 extending spring force on the hammer 24 relative to the drive shaft 12.
- the hammer 24 comprises a ball guide surface 44, which has two axial elevations in a circumferential direction 60. The two axial elevations form a central recess of the
- Ball guide surface 44 of the hammer 24 off.
- the ball guide surface 44 of the hammer 24 in this case forms two convex partial surfaces, which are connected to one another via a concave partial surface.
- the ball guide surface 44 of the hammer 24 is provided for transmitting the radial contact pressure to the ball 26.
- the ball guide surface 44 of the hammer 24 is partially concave curved.
- the partially concave curved ball guide surface 44 of the hammer 24 from a radially innermost point an axial distance 48 to the ball 26 which is greater than a radial distance 50 between the Ball 26 and a radially innermost point of the concave ball guide surface 52 of the guide groove 14.
- the concave curved ball guide surface 44 of the hammer 24 in an operating condition of a parallel to a radial direction 90 of the drive shaft 12 extending portion 46 an axial distance 48 to the ball 26, the is greater than a radial distance 50 between the ball 26 and the concave ball guide surface 52 of the guide groove 14 in a parallel to the axial direction 54 extending portion 56.
- the axial distance 48 from the radially inner point of the curved ball guide surface 44 is more than three times as large as the radial distance 50 between the Ball 26 and the radially innermost point of the concave ball guide surface 52 of the guide groove 14, 16th
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015201573.4A DE102015201573A1 (en) | 2015-01-29 | 2015-01-29 | Impact device, in particular for an impact wrench |
PCT/EP2015/081387 WO2016119988A1 (en) | 2015-01-29 | 2015-12-30 | Percussion mechanism device, in particular for an impact wrench |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3250344A1 true EP3250344A1 (en) | 2017-12-06 |
EP3250344B1 EP3250344B1 (en) | 2019-02-20 |
Family
ID=55072643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15820867.8A Active EP3250344B1 (en) | 2015-01-29 | 2015-12-30 | Percussion mechanism device, in particular for an impact wrench |
Country Status (5)
Country | Link |
---|---|
US (1) | US10870189B2 (en) |
EP (1) | EP3250344B1 (en) |
CN (1) | CN107206578B (en) |
DE (1) | DE102015201573A1 (en) |
WO (1) | WO2016119988A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180026371A (en) | 2015-04-10 | 2018-03-12 | 에덴 그린 하이드로닉스 인터내셔널 (피티와이) 엘티디 | hydroponics |
CN210790852U (en) * | 2018-02-14 | 2020-06-19 | 苏州宝时得电动工具有限公司 | Hand tool and chuck accessory |
US11602106B2 (en) | 2018-07-06 | 2023-03-14 | Eden Green Global Technologies Limited | Hydroponics |
CN111376214B (en) * | 2018-12-28 | 2023-03-31 | 南京泉峰科技有限公司 | Electric tool |
DE202019106525U1 (en) * | 2019-11-22 | 2021-02-26 | C. & E. Fein Gmbh | Hand machine tool |
CN111946700B (en) * | 2020-09-17 | 2022-04-08 | 徐福初 | Pulse torque generation unit |
US20220240998A1 (en) * | 2021-02-01 | 2022-08-04 | Alexander Slocum | Tri-roll thread electric surgical impact tool |
US11872680B2 (en) * | 2021-07-16 | 2024-01-16 | Black & Decker Inc. | Impact power tool |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2691434A (en) * | 1949-10-11 | 1954-10-12 | Ingersoll Rand Co | Biasing mechanism for impact wrenches |
JP4405900B2 (en) * | 2004-03-10 | 2010-01-27 | 株式会社マキタ | Impact driver |
US7308948B2 (en) * | 2004-10-28 | 2007-12-18 | Makita Corporation | Electric power tool |
US20070089891A1 (en) * | 2005-10-26 | 2007-04-26 | Hsin-Chi Chen | Anti-disengagement structure for guide balls of a striking unit |
EP2140977B1 (en) * | 2008-07-01 | 2012-04-25 | Metabowerke GmbH | Impact wrench |
EP2140976B1 (en) * | 2008-07-01 | 2011-11-16 | Metabowerke GmbH | Impact wrench |
US9193053B2 (en) * | 2008-09-25 | 2015-11-24 | Black & Decker Inc. | Hybrid impact tool |
JP4600562B2 (en) | 2008-09-30 | 2010-12-15 | パナソニック電工株式会社 | Impact rotary tool |
JP5405157B2 (en) * | 2009-03-10 | 2014-02-05 | 株式会社マキタ | Rotating hammer tool |
CN102019608B (en) * | 2009-09-10 | 2013-07-03 | 苏州宝时得电动工具有限公司 | Power tool |
DE102010062094A1 (en) * | 2010-11-29 | 2012-05-31 | Robert Bosch Gmbh | Hammer mechanism |
JP2013188812A (en) * | 2012-03-13 | 2013-09-26 | Hitachi Koki Co Ltd | Impact tool |
DE102012211907A1 (en) * | 2012-07-09 | 2014-01-09 | Robert Bosch Gmbh | Rotary impact wrench with a striking mechanism |
DE102012211910A1 (en) * | 2012-07-09 | 2014-01-09 | Robert Bosch Gmbh | Rotary impact wrench with a striking mechanism |
US9272400B2 (en) * | 2012-12-12 | 2016-03-01 | Ingersoll-Rand Company | Torque-limited impact tool |
JP6024446B2 (en) * | 2012-12-22 | 2016-11-16 | 日立工機株式会社 | Impact tools |
US9505107B2 (en) * | 2013-05-14 | 2016-11-29 | Snap-On Incorporated | Ball deflecting chamfer |
JP6027946B2 (en) * | 2013-06-12 | 2016-11-16 | パナソニック株式会社 | Impact wrench |
JP6198515B2 (en) * | 2013-08-08 | 2017-09-20 | 株式会社マキタ | Impact tools |
JP6832509B2 (en) * | 2017-03-27 | 2021-02-24 | パナソニックIpマネジメント株式会社 | Rotary striking tool |
JP6901898B2 (en) * | 2017-04-17 | 2021-07-14 | 株式会社マキタ | Rotating striking tool |
-
2015
- 2015-01-29 DE DE102015201573.4A patent/DE102015201573A1/en not_active Withdrawn
- 2015-12-30 CN CN201580074746.XA patent/CN107206578B/en active Active
- 2015-12-30 US US15/547,646 patent/US10870189B2/en active Active
- 2015-12-30 WO PCT/EP2015/081387 patent/WO2016119988A1/en active Application Filing
- 2015-12-30 EP EP15820867.8A patent/EP3250344B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
US10870189B2 (en) | 2020-12-22 |
US20180001447A1 (en) | 2018-01-04 |
CN107206578A (en) | 2017-09-26 |
CN107206578B (en) | 2020-06-23 |
EP3250344B1 (en) | 2019-02-20 |
DE102015201573A1 (en) | 2016-08-04 |
WO2016119988A1 (en) | 2016-08-04 |
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