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
  • B25B13/00—Spanners; Wrenches
  • B25B13/48—Spanners; Wrenches for special purposes
• • 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
  • B25B13/00—Spanners; Wrenches
  • B25B13/48—Spanners; Wrenches for special purposes
  • B25B13/481—Spanners; Wrenches for special purposes for operating in areas having limited access
• • 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
  • B25B17/00—Hand-driven gear-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
  • B25B17/00—Hand-driven gear-operated wrenches or screwdrivers
  • B25B17/02—Hand-driven gear-operated wrenches or screwdrivers providing for torque amplification
• • 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
  • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
  • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
  • B25B23/1425—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by electrical means

Definitions

• the present invention relates to a screwing device for applying a torque to a screwing partner with integrated detection means for an output torque.
• Screwdriving devices with flat output gears are well known in the art, particularly in industrial screwdriving technology. These are gear units, usually housed in a flat housing, with a drive unit typically located at one end and an output unit located at the opposite end, to which a screwdriving partner, such as a screw to be subjected to torque, can be attached in a suitable and detachable manner.
• a screwdriving partner such as a screw to be subjected to torque
• Such screwdriving devices are used particularly for screwdriving or assembly work where a screwdriving partner is difficult to reach due to spatial installation constraints.
• a generic screwing device is already known from the WO 2018/188829 A1 This discloses detection means associated with the offset output devices, which detect an axial force acting on a helical gear of the offset output device, whereby the output torque acting on a screw partner on the output side can be determined.
• detection means associated with the offset output devices which detect an axial force acting on a helical gear of the offset output device, whereby the output torque acting on a screw partner on the output side can be determined.
• additional axial bearings must be provided, which increases the structural complexity of the structural arrangement in the offset output devices.
• the known detection devices require additional installation space in the flat output devices.
• the GB 2 383 282 A discloses a torque transmission device comprising a hollow shaft with external teeth for connection to a bevel gear and a central shaft guided in the hollow shaft, wherein a flexible cantilever beam arranged between the central shaft and an end-side, cup-like section of the hollow shaft has torque sensors.
• the object of the present invention is to provide an improved screwing device based on the known prior art, which overcomes or at least significantly mitigates the aforementioned disadvantages of the prior art.
• a screwing device with alternative means for determining and/or monitoring the torque acting on a screwing partner on the output side is to be provided, which simultaneously enables a cost-effective and compact design of the flat drive.
• reliable torque determination and/or monitoring is to be enabled.
• the invention also addresses further problems, which will become apparent in more detail from the following description.
• the invention relates to a screwing device for applying a torque to a screw partner, comprising flat output means which have an output which can be detachably connected to the screw partner and a manually or mechanically connected to a Drive torque, in particular via an interposed angular and/or bevel gearing, and detection means (5) provided in a housing of the flat output means for providing measured values for determining and/or monitoring an output torque acting on the screw partner on the output side, wherein the detection means are designed such that they can detect a bearing reaction force in the radial and/or tangential direction of a preferably straight-toothed gearwheel connecting the drive and the output of the flat output means in a torque-transmitting manner and can provide this for electronic signal evaluation, and that the detection means have a force transducer with integrated force sensor means which are designed to detect a compressive and/or tensile force applied to the force transducer in the radial and/or tangential direction, wherein the force transducer is arranged in
• the inventive design of the detection means which are integrated in the housing of the flat output means and detect a radial force and/or tangential force or circumferential force of a gear wheel in the flat output means that interacts with the detection means, provides a structurally simple solution for the reliable provision of measured values for determining and/or monitoring the force acting on a screw partner on the output side.
• Output torque is provided.
• the required installation space in the flat output means can be minimized compared to the known prior art.
• the design of the screw device according to the invention enables cost-effective production and simplified maintenance.
• the efficiency of the flat output means is increased.
• the above-mentioned measured values for determining and/or monitoring the output torque are preferably understood to mean the radial force and/or tangential force detected by the detection means or measured values or measured value signals representing these.
• an electrical energy supply means for such electronic interface or signal processing means provided within the scope of the invention enable such wireless, self-sufficient, and correspondingly flexibly deployable functionality.
• an electrical generator solution can also be considered, which advantageously utilizes the rotary movements of the gear components involved in the screwing device according to the invention and can convert this mechanical kinetic energy into electrical operating energy for the described functionalities in an otherwise known manner. The resulting advantage of independence from batteries or other wired energy sources is obvious.
• the gearwheel cooperating with the detection means according to the invention is arranged between a toothed drive assembly of the flat output means and a toothed output assembly of the flat output means.
• the gearwheel cooperating with the detection means according to the invention is preferably designed as a gearwheel cooperating or meshing directly with the output assembly.
• the gearwheel cooperating with the detection means according to the invention can be directly encompassed by the output assembly.
• the straight-toothed gearwheel itself can form the output assembly of the Form flat output means.
• the gearwheel cooperating with the detection means preferably has a bearing axis arranged fixedly, in particular non-rotatably, in the housing, on which a gear ring of the gearwheel is mounted so as to be freely rotatable, preferably by means of a needle bearing.
• the detection means comprise at least one force transducer.
• This force transducer is preferably rigidly connected, in particular non-rotatably, to a bearing or to the bearing axis of the gear or is formed integrally therewith.
• the force transducer is arranged non-rotatably between the bearing axis and the housing of the flat output means.
• the force transducer can be secured against rotation relative to the housing by means of a suitable pin connection to a housing cover and/or by means of a corresponding shape in a housing cover recess.
• the force transducer is preferably arranged in a line of action of the resulting force acting on the gear, extending radially toward the gear. This preferably refers to a radially acting force in which the preferably co-directional tangential or circumferential forces acting on the gear are combined or can be combined to form a resultant force.
• the force transducer is preferably arranged such that it can detect a radial force in or along a line of action.
• the force transducer can be arranged or configured coaxially with the associated gear and/or rotationally symmetrically.
• the force transducer preferably has an outer diameter or a maximum radial extent that essentially corresponds to a root circle of the toothing of the associated straight-toothed gear.
• the force transducer preferably has an axially extending thickness of 1 to 5 mm, more preferably between 1 and 2.5 mm.
• the force transducer has integrated force sensor means configured to detect a compressive and/or tensile force applied to the force transducer in the radial and/or tangential direction of the gear or the force transducer.
• the force sensor means are preferably arranged in a radially extending line of action of the resulting force applied to the gear.
• the force sensor means comprise at least one strain gauge attached to the force transducer.
• at least two strain gauges are arranged or attached to the force transducer.
• the strain gauges are preferably arranged on radially extending and preferably opposite spokes or struts of the force transducer.
• the force sensor means can also comprise piezo elements.
• the force sensor means may comprise hydraulic or pneumatic pressure sensor means attached to or connected to the force transducer.
• the force transducer may have at least one or preferably two suitable chambers, for example in the form of recesses or cavities, in which a fluid suitable for hydraulic or pneumatic sensor sensing is arranged or introduced.
• the chambers are preferably arranged opposite one another in the force transducer and in a respective half of the force transducer.
• the force sensor means comprise a graphene-containing polymer mass with variable electrical conductivity attached to or integrated into the force transducer.
• This can, for example, be introduced into suitable chambers, for example in the form of recesses or cavities in the force transducer, which are preferably arranged opposite one another in a respective half of the force transducer.
• the polymer mass is preferably formed by a graphene-containing viscoelastic polymer mass, such as a silicone-based bouncy clay with boron content.
• a conductive polymer mass with incorporated graphene particles or flakes, which has a variable electrical resistance when pressure changes on the polymer mass is known, cf. Science magazine, December 9, 2016, Vol. 354, Issue 6317, Pages 1257-1260 .
• the above-mentioned sensor means can provide a measured value signal that reliably represents and/or monitors the output-side torque with high measurement quality and accuracy, preferably for electronic signal evaluation.
• the detection means can comprise means for wireless signal transmission of a signal corresponding to the detected output torque and/or
• the detection means may further comprise electronic interface and/or signal processing means as well as electrical energy supply means. The latter may be implemented as electrical generator means interacting with a movable, in particular rotating, component of the flat output means.
• the offset output means according to the invention are preferably closed or open offset output means.
• the offset output means can be designed with or without an angular gear.
• the offset output means can also have curved teeth, for example, as part of an angular gear.
• the detection means according to the invention can also be assigned to a gear with curved teeth or interact with it to detect the radial and/or tangential force acting on the gear.
• the present invention relates to a preferably handheld or stationary screwing system, comprising the screwing device as described above and drive torque generating means connected to the flat output means on the drive side.
• the torque generating means are preferably in the form of a manually operable or automatic screwdriver.
• a stationary screwing system is preferably understood to mean a screwing system that is permanently installed or built into a production unit, for example, a robot cell, and can preferably be operated by an automatic control system.
• Fig. 1 shows a preferred embodiment of the screwing device 10 according to the invention for applying a torque to a screwing partner 20, such as a screw.
• the screwing device 10 comprises a flat output means 1 having an output 1b that can be releasably connected to the screwing partner 20 and a drive 1a, which can be manually or mechanically subjected to a drive torque, for example via an interposed angular and/or conical gearing 31.
• the screwing device 10 can be connected to a screwing tool 30, preferably selectively, whereby the inventive Screw system 40 is formed.
• the screwing tool 30 can be a commercially available tool and can apply a torque via the angle and/or bevel gearing 31 into the flat output means 1 of the screwing device 10 in a motorized manner, e.g., electrically or pneumatically.
• the drive torque thus applied is transmitted by the flat output means 1 in the manner described below to a tool 32 arranged as output 1b for screwing the screwing partner 20.
• the screw device 10 has a flat housing 30, which is preferably formed from essentially two uniformly shaped housing halves 30a, 30b.
• the housing 30 preferably has a maximum height or width b of 30 mm, more preferably 20 mm.
• Fig. 2 shows a perspective view of the flat output means 1 according to the invention with the housing partially removed.
• the flat output means 1 have a drive assembly 2, for example, for interacting with the angle and/or bevel gearing 31 provided on the drive side, and an output assembly 3 for interacting with the screw partner 20, for example via a tool 32 connected to it and arranged on the output side.
• the flat output means 1 preferably comprise a plurality of gears 4a, 4b, 4c, 4d, 4e, which form a gear arrangement between the input 1a and the output 1b of the flat output means 1.
• the gears are preferably straight-toothed gears, which, for example, realize a gear ratio of 1:1.
• the gears can also deviate from the illustration in Fig. 2 be implemented as helical gears. A different gear ratio can also be implemented.
• the gears are preferably arranged axially parallel in the housing 30 and extend linearly along a longitudinal extent of the housing 30, in which they are rotatably mounted.
• the gears can be partially enclosed by the drive or output assembly 2, 3.
• the drive assembly 2 and the output assembly 3 each have a toothing or a gear 4a, 4e, which is operatively connected to the remaining gears of the gear arrangement.
• the drive and output assemblies 2, 3 can each be formed by a gear 4a, 4e.
• such flat output gears 1 are designed and suitable for transmitting a maximum torque of approximately 200 Nm.
• the typical efficiency of such a straight-toothed gear arrangement is between approximately 85% and 95% (i.e., the ratio of an output-side torque at 4e to a drive-side torque at 4a).
• Fig. 6 shows a schematic diagram in which the Fig. 2 shown linear arrangement of the straight-toothed gear group 4c,4d,4e schematically is shown.
• the respective tangential or circumferential forces F 1a , F 1b and F 2a , F 2b act in the Y direction shown during gear engagement and thus run essentially orthogonally to an extension direction X of the gear arrangement 4c, 4d, 4e.
• the origin of the forces in the gear engagement is shown on both sides as an example. The magnitude of the forces differs only by a possible loss of efficiency within a gear stage.
• the detection means 5 are therefore preferably arranged in the line of action of the resulting force applied to the gear 4d or arranged in such a way that they can detect the forces occurring in or along the line of action.
• the detection means 5 comprise a preferably substantially disc-shaped force transducer 5a, for example in the form of a spoked wheel (see also Fig. 3c ), which is integrally formed with a rotational axis 19 of the gear 4a and/or is fixedly connected, in particular in a rotationally secure manner.
• the force transducer 5a is mounted in the housing 30a, 30b in a rotationally fixed manner, for example by means of axially arranged bores 9a, 9b and connecting pins (not shown) received therein.
• the force transducer 5a can also be mounted in the housing in a form-securing manner.
• the force transducer 5a can have an outer shape, for example essentially trapezoidal (cf. Fig. 3d ), which is located in a corresponding recess of the Housing 30a,30b can be accommodated or stored in a rotationally secure manner.
• the force transducer 5a is preferably arranged on an end face 6a of the gear 4d or the rotational axis 19 of the gear 4d.
• the detection means 5 preferably comprise two preferably identically designed force transducers 5a, which are arranged on two opposite end faces 6a, 6b of the gear 4a or the rotational axis 19 of the gear 4d (cf. Fig. 3b ).
• a signal can be output via the sensor cabling 13, which is otherwise provided in a conventional and known manner for subsequent processing and evaluation.
• the strain gauges as force sensors detect a voltage change. generated due to elastic deformation by radial forces, which is provided for electronic signal evaluation and in particular for determining and/or monitoring an output-side torque.
• the device can also have means for wireless signal transmission (not shown).
• the signal evaluation can be carried out using computing means (not shown) assigned to the device or connectable to it, which, for example, calculate or monitor the associated or applied torque based on an output voltage signal. This can be done, for example, based on comparison tables stored in a database.
• Fig. 5 shows a further preferred embodiment of the detection means 5 according to the invention, wherein the force transducer 5a has a graphene-containing polymer mass with variable electrical conductivity as the sensor means.
• the force transducer 5a has at least one or preferably two suitable chambers 15a, 15b in the form of recesses or cavities, into which the graphene-containing polymer mass is introduced, and which is contacted by respective associated electrical lines 16a, 16b and 17a, 17b.
• the chambers 15a, 15b are preferably arranged mirrored along an axis B that divides the force transducer 5a in half.
• Radially extending spring elements 26 are preferably arranged within the chambers 15a, 15b as supporting structural elements.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Force Measurement Appropriate To Specific Purposes (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
• Optical Measuring Cells (AREA)
• Glass Compositions (AREA)
• Reinforced Plastic Materials (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

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Publications (3)

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• 2019
  • 2019-08-02 ES ES19189731T patent/ES2943491T3/es active Active
  • 2019-08-02 ES ES23154666T patent/ES3041661T3/es active Active
  • 2019-08-02 EP EP23154666.4A patent/EP4197696B1/de active Active
  • 2019-08-02 EP EP19189731.3A patent/EP3771519B1/de active Active
• 2020
  • 2020-06-18 CN CN202080061955.1A patent/CN114375242A/zh active Pending
  • 2020-06-18 JP JP2022506605A patent/JP7602810B2/ja active Active
  • 2020-06-18 KR KR1020227005602A patent/KR102726000B1/ko active Active
  • 2020-06-18 US US17/631,671 patent/US12128530B2/en active Active
  • 2020-06-18 WO PCT/EP2020/066949 patent/WO2021023422A1/de not_active Ceased

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