EP3789162A1 - Entraînement rotatif pour une machine-outil mainuelle - Google Patents

Entraînement rotatif pour une machine-outil mainuelle Download PDF

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Publication number
EP3789162A1
EP3789162A1 EP19195363.7A EP19195363A EP3789162A1 EP 3789162 A1 EP3789162 A1 EP 3789162A1 EP 19195363 A EP19195363 A EP 19195363A EP 3789162 A1 EP3789162 A1 EP 3789162A1
Authority
EP
European Patent Office
Prior art keywords
rotary drive
track body
tool
rotary
ball cage
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.)
Withdrawn
Application number
EP19195363.7A
Other languages
German (de)
English (en)
Inventor
Maximilian Knyrim
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
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 Hilti AG filed Critical Hilti AG
Priority to EP19195363.7A priority Critical patent/EP3789162A1/fr
Priority to EP20186380.0A priority patent/EP3854532A1/fr
Priority to EP20186377.6A priority patent/EP3845340A1/fr
Priority to EP20757920.2A priority patent/EP4025800A1/fr
Priority to CN202080041865.6A priority patent/CN113950392B/zh
Priority to PCT/EP2020/073621 priority patent/WO2021043612A1/fr
Priority to US17/637,360 priority patent/US20220288760A1/en
Priority to EP21705567.2A priority patent/EP4182123A1/fr
Priority to EP21705568.0A priority patent/EP4182124A1/fr
Priority to PCT/EP2021/054285 priority patent/WO2022012785A1/fr
Priority to US18/005,427 priority patent/US20230278182A1/en
Priority to PCT/EP2021/054287 priority patent/WO2022012786A1/fr
Priority to US18/014,100 priority patent/US20230311289A1/en
Publication of EP3789162A1 publication Critical patent/EP3789162A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • 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
    • 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
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • 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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of 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
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B25D2216/003—Tools having a percussion-and-rotation mode comprising de-phasing of percussion and rotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/045—Cams used in percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/121—Housing details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/231—Sleeve details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/321—Use of balls

Definitions

  • the present invention relates to a rotary drive for driving a tool holder of a handheld power tool, in particular a combination hammer or hammer drill.
  • the rotary drive is designed to convert a thrust input movement into a rotary output movement in relation to a working axis of the tool holder.
  • Such a rotary drive is for example from the EP 3 181 302 A1 known.
  • the object is achieved in that the rotary drive is designed as a link mechanism with a free-running track body and a ball cage arranged coaxially to the track body, with at least one ball of the ball cage in one on an outer surface when the ball cage is acted upon by the thrust input movement of the track body formed endless track contour slides and thus causes a rotation of the freely mounted track body.
  • the ball cage can have one or more balls.
  • the ball is not rigidly connected to either the track body or the ball cage.
  • the invention includes the knowledge that when the drilling tool (striking and rotating tool) is varied, other drill diameters or types of drill sometimes require a slower speed of the tool holder for the best possible drilling behavior. This makes a comparatively more step-down gear necessary, which - at least in the case of the handheld power tools of the prior art - disadvantageously increases the space requirement, the costs, the number of components, the complexity and the weight of these machines.
  • a link mechanism is used.
  • spur gears and / or bevel gears which are exclusively or at least predominantly used in hand machine tools of the prior art come into use.
  • a comparatively compact and robust rotary drive can be provided.
  • the continuous web contour is designed to be wavy and / or continuous.
  • the continuous path contour is free of path sections which are oriented parallel to the working axis of the tool holder.
  • the rotary drive has a sleeve carrying the ball cage, the sleeve encompassing the track body at least in sections.
  • the track body is freely supported by a form-fitting or force-fitting freewheel. In this way it can be ensured that the initial rotary movement is only carried out in one direction of rotation.
  • the track body preferably has only one degree of freedom, preferably only one rotational degree of freedom about the working axis.
  • the web body consists of plastic or has such a material.
  • the rotary drive can be free of metal gears.
  • a handheld power tool in particular a rotary hammer or combination hammer, with a tool holder for holding a striking and rotating tool on a working axis and with an electric motor.
  • the handheld power tool is equipped with a rotary drive of the type described above, the electric motor being coupled to the rotary drive for generating the thrust input movement and the rotary drive being arranged to drive a spindle carrying the tool holder to rotate about the working axis.
  • the handheld power tool is equipped with an impact mechanism which has a hammer that is periodically moved along the working axis, the electric motor being coupled to the impact mechanism.
  • the electric motor is particularly preferably coupled to the hammer mechanism via a gear component, which can have an impact mechanism eccentric wheel or a swash plate.
  • the hammer mechanism is arranged at least in sections within the track body and / or within the sleeve carrying the ball cage. In this way, the handheld power tool can be designed to be particularly compact.
  • the spindle performs an uneven, swelling rotary output movement.
  • a looping movement and a rotary movement of the tool holder can be offset in phase, for example with a phase offset of 180 degrees.
  • FIG Fig. 1 A first preferred embodiment of a rotary drive 70 is shown in FIG Fig. 1 shown.
  • the rotary drive 70 is used to drive a tool holder 2 (only shown schematically here) of a handheld power tool 100 (cf. Fig. 4 ).
  • the rotary drive 70 is designed to convert a thrust input movement SE into a rotary output movement DA in relation to a working axis 3 of the tool holder 2.
  • the rotary drive 70 is designed as a link mechanism 71 with a freely supported track body 75 and a ball cage 77 arranged coaxially to the track body, wherein when the ball cage 77 is acted upon by the thrust input movement SE, at least one ball 76 of the ball cage 77 in an on an outer surface OF of the track body 75 slides along the endless track contour 78 and thus causes a rotation of the freely supported track body 75 about the working axis 3.
  • the rotary drive 70 has a sleeve 79 carrying the ball cage 77, the sleeve 79 encompassing the track body 75 at least in sections.
  • the sleeve 79 is connected via a gear component 17, which has a connecting rod 7 and an impact mechanism eccentric wheel 21, to an electric motor, which is only shown schematically here.
  • the cyclic thrust input movement SE of the sleeve 79 is generated by means of the gear component 17.
  • the rotary drive designed as a link drive 71 has, for example, a transmission ratio of 1:25, ie 25 strokes of the thrust input movement SE are required in order to offset the track body 75 by 360 degrees about the working axis 3.
  • the track body 75 is mounted free-wheeling in a freewheel 72 embodied here as a form-fitting example.
  • the freewheel 72 can ensure that the rotary output movement DA is only carried out in one direction of rotation (indicated by the arrowhead at DA).
  • the rotary drive 70 preferably has an anti-rotation device 73 for the sleeve 79, here, for example, in the form of a groove-pin pairing 73 '.
  • the track body 75 is mounted immovably with respect to the machine housing 10 in the direction of the working axis 3, here for example by means of a fixed bearing 69.
  • a preferred track body 75 should now be referenced with reference to FIG Fig. 2 to be discribed. It shows Figure 2A the track body 75 in a perspective view. An enlarged portion of the outer surface OF of the sheet body 75 is shown in FIG Figure 2B shown.
  • the web body 75 which is made of plastic, for example, has an undulating continuous web contour 78 in the circumferential direction U.
  • the endless web contour 78 extends over the entire circumferential direction U.
  • the endless web contour 78 is free of web sections that are parallel to the Working axis 3 are oriented. This favors a continuous sliding and / or rolling of one or more balls 76 of the ball cage, which is now with reference to FIG Fig. 3 should be described in more detail.
  • FIG. 11 shows a schematic representation of the endless web contour 78 of FIG Fig. 2 .
  • a guide body in the form of a ball 5 (in Fig. 2 shown in several positions) runs in the endless web contour 78, more precisely, slides and / or rolls in this.
  • the ball 5 is driven by a cyclical translational movement SE (which is defined by the stroke distance HD of the connecting rod 7), with the arrows PR oriented to the right each indicating a "pulling" of the connecting rod 7 (cf. Fig. 1 ) Show.
  • the arrows LR which are oriented to the left here, each show a "pushing" of the connecting rod 7 (cf. Fig. 1 ) at.
  • the ball Due to the path geometry shown, the ball always slides and / or rolls in the same path direction BR.
  • the endless web contour 78 is arranged on an outer surface OF of the cylindrical web body 75 in the circumferential direction U.
  • the only remaining degree of freedom of the cylindrical track body 75 is the initial rotational movement DA about the cylinder axis, which here coincides with the working axis 3.
  • the endless track contour 78 is so pronounced that the ball 76 can always move freely.
  • the corners of the path contour of the ball 76 of the ball cage 77 always travel reliably in the same path direction BR.
  • the endless path contour 78 produces an initial rotary movement DA.
  • the initial rotary movement DA takes place equally with every forward stroke (left-oriented arrows LR) and backward stroke (right-oriented arrows PR).
  • the speed VDA of the initial rotary movement DA is physically due to the path contour unevenly (similar to a swelling behavior).
  • the ball 76 Due to the comparatively large (here, for example, greater than 60 degrees) of the helix angle SW in the respective corner areas EB of the continuous web contour 78, the ball 76 is located in its reversal points UP clearly below a singular point SP of the continuous web contour 78 and is during the return movement (right-hand arrows PR) reliably detected by the catch funnel FT, ie a comparative widening of the continuous web contour 78, which makes it easier for the ball 76 to be “caught”. It was recognized that when the driven tool 4 (cf. Fig. 4 ) acts like an elastic torsion spring, with a corresponding torque there is a risk of the ball 76 moving back in the continuous web contour 78 (ie against the web direction BR). To this behavior too avoid, a freewheel 72 is provided according to the invention (cf. Fig. 1 ) the counter-rotation movement (in the opposite direction to the initial rotation movement DA).
  • FIG. 4 shows a hammer drill 101 as an example of a percussive hand-held power tool 100.
  • the hammer drill 101 has a tool holder 2, in which a drill, chisel or other percussive tool 4 can be inserted and locked coaxially to a working axis 3.
  • the hammer drill 101 has a pneumatic hammer mechanism 50 which can periodically exert blows in an impact direction 6 on the tool 4.
  • a rotary drive 70 according to the invention can rotate the tool holder 2 about the working axis 3.
  • the pneumatic hammer mechanism 50 and the rotary drive 7 ⁇ are driven by an electric motor 8, which is fed with electrical current from a battery 9 or a power line.
  • the striking mechanism 50 and the rotary drive 70 are arranged in a machine housing 10.
  • a handle 11 is typically arranged on a side of the machine housing 10 facing away from the tool holder 2.
  • the user can hold and guide the hammer drill 101 in operation by means of the handle 11.
  • An additional auxiliary handle can be attached near the tool holder 2.
  • An operating button 12 is arranged on or in the vicinity of the handle 11, which the user can actuate preferably with the holding hand.
  • the electric motor 8 is switched on by pressing the operating button 12. Typically, the electric motor 8 rotates as long as the operating button 12 is held down.
  • the tool 4 is movable in the tool holder 2 along the working axis 3.
  • the tool 4 has an elongated groove into which a locking ball 5 or another locking body of the tool holder 2 engages. The user holds the tool 4 in a working position in that the user presses the tool 4 indirectly against a substrate using the hammer drill 101.
  • the tool holder 2 is fastened to a spindle 13 of the rotary drive 70, the spindle 13 here being formed in one piece with the track body 75 of the rotary drive.
  • the tool holder 2 can move around the working axis 3 with respect to the machine housing 10 rotate.
  • At least one claw 1 or other suitable means in the tool holder 2 transmit a torque from the tool holder 2 to the tool 4.
  • the rotary drive 70 is designed as a link mechanism 71 with a free-running 75 track body and a ball cage 77 arranged coaxially to the track body 75.
  • a ball 76 of the ball cage 77 slides in an endless track contour 78 formed on an outer surface of the track body 75, causing a rotation (about the working axis 3 in the direction of the arrow of the rotary output movement DA) of the freely supported (here is brought about, for example, by a form-fitting freewheel 72) track body 75.
  • the pneumatic hammer mechanism 50 has an exciter 14, a striker 15 and an anvil 16 along the impact direction 6.
  • the exciter 14 is forced to periodically move along the working axis 3 by means of the electric motor 8.
  • the exciter 14 is connected via a gear component 17 for converting the rotary movement of the electric motor 8 into a periodic, translational movement along the working axis 3.
  • An exemplary transmission component 17 includes an impact mechanism eccentric wheel 21 or a swash plate.
  • a period of the translatory movement of the exciter 14 is specified by the speed of the electric motor 8 and possibly a reduction ratio in the transmission component 17.
  • the connecting rod 7, which is fastened to a sleeve 79 of the rotary drive 70 by means of a connecting pin 80, can be clearly seen.
  • the sleeve 79 carries the ball cage 76 and the sleeve 79 engages around the track body in sections, ie in particular in the area of the ball cage 76.
  • Both the rotary drive 70 and the hammer mechanism 50 are coupled to the electric motor of the handheld power tool 100 via the transmission component 17.
  • the hammer mechanism 50 is arranged at least in sections within the track body 75 and in sections within the sleeve 79 carrying the ball cage 77.
  • the striker 15 couples to the movement of the exciter 14 via an air spring.
  • the air spring is formed by a pneumatic chamber 18 closed off between the exciter 14 and the striker 15.
  • the striker 15 moves in the striking direction 6 until the striker 15 strikes the striker 16.
  • the striker 16 rests against the tool 4 in the striking direction 6 and transfers the impact to the tool 4.
  • the period of the movement of the striker 15 is identical to the period of the movement of the exciter 14.
  • the striker 15 thus strikes with a number of strikes is equal to the inverse of the period.
  • the optimum number of strokes is predetermined by the mass of the racket 15 and the geometric dimensions of the pneumatic chamber 18.
  • An optimal number of beats can be in the range between 25 Hz and 100 Hz.
  • the exemplary hammer mechanism 50 has a piston-shaped exciter 14 and a piston-shaped hammer 15, which are guided by a guide tube 19 along the working axis 3.
  • the outer surfaces of the exciter 14 and the striker 15 rest on the inner surface of the guide tube 19.
  • the pneumatic chamber 18 is closed off by the exciter 14 and the beater 15 along the working axis 3 and by the guide tube 19 in the radial direction. Sealing rings in the lateral surfaces of exciter 14 and hammer 15 can improve the airtight seal of the pneumatic chamber 18.
  • the rotary drive 70 contains the spindle 13, which is arranged coaxially to the working axis 3.
  • the spindle 13 is hollow, for example, and the hammer mechanism 50 is arranged inside the spindle.
  • the tool holder 2 is placed on the spindle 13.
  • the tool holder 2 can be detachably or permanently connected to the spindle 13 via a locking mechanism.
  • the spindle 13 preferably rotates periodically.
  • the spindle 13 is preferably rotated continuously but at a speed that is dependent on the rotational position (due to the rotary drive 70 designed as a link mechanism 71).
  • the spindle 13 therefore performs an uneven, swelling rotary output movement Da.
  • the rotary drive 70 is synchronized with the striking mechanism 50, it being possible for the striking movement and rotary movement to be out of phase, for example by 180 degrees.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP19195363.7A 2019-08-19 2019-09-04 Entraînement rotatif pour une machine-outil mainuelle Withdrawn EP3789162A1 (fr)

Priority Applications (13)

Application Number Priority Date Filing Date Title
EP19195363.7A EP3789162A1 (fr) 2019-09-04 2019-09-04 Entraînement rotatif pour une machine-outil mainuelle
EP20186380.0A EP3854532A1 (fr) 2019-08-19 2020-07-17 Machine-outil, outil et système de machine-outil à un certain rapport de vitesse de rotation et de puissance de percussion
EP20186377.6A EP3845340A1 (fr) 2019-08-19 2020-07-17 Machine-outil, outil et système de machine-outil à un certain rapport de vitesse de rotation et de fréquence de percussion
EP20757920.2A EP4025800A1 (fr) 2019-09-04 2020-08-24 Entraînement rotatif pour machine-outil portative
CN202080041865.6A CN113950392B (zh) 2019-09-04 2020-08-24 手持式动力工具和用于手持式动力工具的旋转驱动件
PCT/EP2020/073621 WO2021043612A1 (fr) 2019-09-04 2020-08-24 Entraînement rotatif pour machine-outil portative
US17/637,360 US20220288760A1 (en) 2019-09-04 2020-08-24 Rotary drive for a hand-held power tool
EP21705567.2A EP4182123A1 (fr) 2019-08-19 2021-02-22 Outil électrique portatif, outil et système d'outil électrique portatif comportant un certain rapport vitesse de rotation/fréquence de frappe
EP21705568.0A EP4182124A1 (fr) 2019-08-19 2021-02-22 Outil électrique portatif, outil et système d'outil électrique portatif ayant un rapport vitesse/force d'impact déterminé
PCT/EP2021/054285 WO2022012785A1 (fr) 2019-08-19 2021-02-22 Outil électrique portatif, outil et système d'outil électrique portatif comportant un certain rapport vitesse de rotation/fréquence de frappe
US18/005,427 US20230278182A1 (en) 2019-08-19 2021-02-22 Hand-Held Power Tool, Tool and Hand-Held Power Tool System Having a Designated Ratio of Rotational Speed to Impact Frequency
PCT/EP2021/054287 WO2022012786A1 (fr) 2019-08-19 2021-02-22 Outil électrique portatif, outil et système d'outil électrique portatif ayant un rapport vitesse/force d'impact déterminé
US18/014,100 US20230311289A1 (en) 2019-08-19 2021-02-22 Hand-held power tool, tool and hand-held power tool system with a determined speed/impact power ratio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19195363.7A EP3789162A1 (fr) 2019-09-04 2019-09-04 Entraînement rotatif pour une machine-outil mainuelle

Publications (1)

Publication Number Publication Date
EP3789162A1 true EP3789162A1 (fr) 2021-03-10

Family

ID=67851030

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19195363.7A Withdrawn EP3789162A1 (fr) 2019-08-19 2019-09-04 Entraînement rotatif pour une machine-outil mainuelle
EP20757920.2A Withdrawn EP4025800A1 (fr) 2019-09-04 2020-08-24 Entraînement rotatif pour machine-outil portative

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP20757920.2A Withdrawn EP4025800A1 (fr) 2019-09-04 2020-08-24 Entraînement rotatif pour machine-outil portative

Country Status (4)

Country Link
US (1) US20220288760A1 (fr)
EP (2) EP3789162A1 (fr)
CN (1) CN113950392B (fr)
WO (1) WO2021043612A1 (fr)

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US20220288760A1 (en) 2022-09-15
WO2021043612A1 (fr) 2021-03-11
CN113950392A (zh) 2022-01-18
CN113950392B (zh) 2024-09-13

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