EP3848160A1 - Procédé de fourniture d'une fonction boost pour un outil électrique, ainsi qu'outil électrique pourvu de moteur - Google Patents

Procédé de fourniture d'une fonction boost pour un outil électrique, ainsi qu'outil électrique pourvu de moteur Download PDF

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Publication number
EP3848160A1
EP3848160A1 EP20151128.4A EP20151128A EP3848160A1 EP 3848160 A1 EP3848160 A1 EP 3848160A1 EP 20151128 A EP20151128 A EP 20151128A EP 3848160 A1 EP3848160 A1 EP 3848160A1
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EP
European Patent Office
Prior art keywords
power tool
motor
speed
operating state
external conditions
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Withdrawn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
EP20151128.4A
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German (de)
English (en)
Inventor
Christian Sattler
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 EP20151128.4A priority Critical patent/EP3848160A1/fr
Publication of EP3848160A1 publication Critical patent/EP3848160A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a method for providing a boost function for an electric tool, the electric tool having a motor.
  • the invention relates to a power tool with a motor.
  • a special feature of the invention is that different speeds and torques can be set in the power tool as a function of different external conditions. In this way, different operating states of the power tool are preferably established.
  • the invention can provide a boost function for the power tool.
  • the boost function makes it possible to operate the power tool in a second operating state with a higher torque than in a first operating state.
  • power tools such as cutoff grinders, slitting devices or diamond cutoff grinders, are known, with which different areas of a masonry or a substrate can be separated from one another.
  • this is done by making a slot in the subsurface.
  • the slot can act as a separating joint between different areas of the subsurface or serve to accommodate supply lines such as electrical cables.
  • the device types mentioned above by way of example have a cutting disc as a tool, which is often also referred to as a "blade".
  • the electrical devices have a motor with which the tool can be driven.
  • the power tool is mostly operated by a rotational movement of the tool and is characterized by the speed of the motor.
  • Power tools, such as the device types mentioned above are usually operated at a fixed motor speed. This can be achieved, for example, in that a previously determined speed is preset for each device at the factory, which the user of the power tool cannot easily change.
  • the object of the present invention is accordingly to provide a method for providing a boost function for an electrical device, with which the operation of the electrical device can be adapted to different applications and environmental conditions.
  • a possibility is to be provided to be able to work with a sufficiently powerful electric tool in unfavorable external conditions.
  • the provision of a power tool that can be operated for a certain period of time in a particularly powerful operating state is preferably referred to as a boost function of the power tool in the context of the invention.
  • a further object of the invention is also to provide a power tool which is set up to implement the boost method to be provided.
  • the invention in a second aspect, relates to a power tool with a motor, the power tool being characterized in that a first or a second operating state of the power tool can be set by setting a first or a second speed of the motor, the setting of the first or second Engine speed takes place as a function of external conditions.
  • a first operating state of the power tool is set by setting the first speed n1 of the motor and that a second operating state of the power tool is set by setting the second speed n2, the setting of the first or second motor speed in Dependence on external conditions takes place.
  • the setting of different speeds on the motor advantageously results in different torques for the operation of the power tool, so that an adjustability or adjustability of the torque of the power tool can advantageously be achieved by setting different speeds as a function of external conditions.
  • the definitions, technical effects and advantages described for the method apply analogously to the power tool, and vice versa.
  • the motor is an electrically commutated brushless motor.
  • Brush motors are usually mechanically commutated and they have a fixed, natural characteristic curve with load points when the speed of the motor is plotted against the torque.
  • the load points in a speed-torque diagram can be essentially freely selected, at least within limits, via electrical commutation and a corresponding design of the motor.
  • the power of the motor preferably remains the same or in a similar size range.
  • Brush motors often only allow load points with low power or a mechanical gear must be provided for setting these load points. Such an undesirable, complex provision of a mechanical transmission can advantageously be dispensed with when using a brushless motor, since the brushless motor can, as it were, replace the mechanical transmission.
  • the different engine speeds preferably result in different torques with which the power tool is operated.
  • the invention surprisingly enables the power of the power tool to be divided in favor of a higher torque at a lower speed.
  • n stands for the speed of the motor
  • M the torque
  • P for the power of the electrical device.
  • the term on the right-hand side of the equation always corresponds to an essentially constant value, preferably the power P of the power tool.
  • the above equation represents a link between the physical quantities speed n and torque M, which behave in opposite proportions.
  • the link is used in the present invention to provide an adaptability of the power tool to different external conditions, as well as a boost function for the power tool.
  • the invention provides a possibility of activating a boost function for the power tool by the user when more torque is required for an application to be carried out efficiently. This can be the case, for example, in unfavorable external conditions, when very hard or dense material is being processed or, for example, a reinforcing rod is encountered in the material.
  • the invention can provide increased work efficiency, this increased work efficiency being achieved in particular by adapting the power distribution of the power tool depending on the application conditions. Tests have shown that, surprisingly, the power tool can be provided with a torque that is more than 10% higher in boost mode than in the first operating state.
  • the first external conditions can correspond, for example, to external boundary conditions for the operation of the power tool which enable uncomplicated, smooth and simple operation of the power tool.
  • these external conditions are preferably referred to as ideal boundary conditions.
  • You can, for example, by a homogeneous subsurface, an essentially straight cut and / or a low friction of the The tool of the power tool.
  • a first engine speed n1 can preferably be assigned to these ideal boundary conditions.
  • This first torque M1 is achieved by the power tool in particular when the power tool is operated under the first external conditions, ie ideal boundary conditions.
  • the second external conditions differ from the first external conditions.
  • the second external conditions can be more or less suitable for the operation of the power tool.
  • the second external conditions make working with the power tool more difficult.
  • the second external boundary conditions are preferably referred to as “poorer boundary conditions”. They can be characterized, for example, by an inhomogeneous subsurface, an inclined cut and / or high friction of the tool of the power tool.
  • the determination that the boundary conditions for the operation of the power tool have changed can be made by means of a suitable sensor system on the power tool. In the context of the invention, however, it can also be preferred that the determination is made by the user of the power tool himself. For example, he can perceive that the tool of the power tool has hit a reinforcing bar, so that the work progress of the power tool is made more difficult. It can also happen that you are working in an uneven or unevenly dense subsurface. In these cases, the user of the power tool can adapt the desired operating mode of the power tool to the currently existing or perceived load, in particular by causing the electrical device to switch from the first to the second operating state.
  • the second operating state can preferably be referred to as a boost mode, which is advantageously associated with a higher torque than that first operating state, which can be set on the electrical device, for example, under ideal boundary conditions.
  • the boost function can be activated, for example, when external conditions become more severe. This is preferably done by setting a second speed n2 in response to the changed external conditions.
  • the second speed n2 is lower than the first motor speed n1.
  • a reduction in the speed means that a larger second torque M2 can be made available for operating the power tool (“boost function”).
  • the second torque M2 is greater than the first torque M1 with which the power tool is operated in the first operating state.
  • the first operating state is preferably referred to as the ideal or standard operating state
  • the second operating state is preferably referred to as the boost operating state.
  • the power tool When the power tool is operated in the second operating state, there are several options for continued operation. For example, a return to the first engine speed n1 is conceivable. This return can, for example, take place automatically after an adjustable period of time ⁇ t.
  • the external conditions of the power tool are monitored with a suitable sensor system, wherein the power tool can be set up, for example, to decide for itself whether the first or the second operating state as a function of the external conditions determined is set.
  • the power tool can include a control device in which the measured values and data determined by the sensor system are processed and evaluated using information technology.
  • the power tool comprises a control device for the automatic setting of the operating state by the power tool itself.
  • the control device is preferably set up to process and evaluate information with regard to the external conditions using information technology.
  • the information regarding the external conditions is preferably determined by a sensor system, which can also be part of the power tool.
  • the power tool comprises a sensor system with which the external conditions can be determined.
  • detection is carried out by operating patterns on the basis of existing operating measured variables.
  • These operational measured variables can, for example, be electrical variables such as the current.
  • the use of such a detection using operating patterns is particularly advantageous when detecting reinforcement hits, i.e. when steel is hit while drilling in a subsurface or masonry.
  • the feed and / or the feed force is measured and / or evaluated.
  • vibration patterns can be evaluated in the context of the present invention. Such an evaluation of vibration patterns is based on the inventors' knowledge that the power tool vibrates differently depending on whether the power tool tool has hit steel, for example, or whether the power tool tool is jammed, for example.
  • a user decides in which operating state the power tool is operated.
  • This decision by the user can, for example, be based on his or her subjective perception. In other words, depending on the external conditions perceived by him, the user can decide whether the first or the second operating state is to be set on the power tool.
  • the power tool can have suitable and easily accessible switching devices or can be controlled via spoken commands or gestures.
  • the power tool comprises a switching device for setting the operating state.
  • the power tool comprises a corresponding input device for inputs by the user. This can be, for example, an operating screen, such as a touch screen, for the power tool.
  • the power tool can also be preferred to continue the operation of the power tool at the second motor speed n2, for example until a point in time at which the first external conditions are determined again.
  • This can be done automatically by a corresponding sensor system on the power tool or by the perception of a user of the power tool. Accordingly, it can be preferred within the meaning of the invention that the power tool, after recognizing that the first external conditions are present again, of its own accord, ie preferably automatically, returns to the first operating state in which the motor is operated at the first speed n1.
  • the user switches between a first operating state with an engine speed n1 and a second operating state that is determined by an engine speed n2 is marked can choose himself, for example by activating or releasing a corresponding switch on the power tool.
  • boost function means that a power tool can be operated for a short time above its actual performance limit in order to achieve a particularly high, but at least equally high, output in this short operating period, the boost mode particularly high torque M is characterized to work.
  • a power tool in boost mode can be used, for example, to separate thin, particularly hard components of masonry from one another.
  • boost function can significantly simplify the work of a user.
  • a speed of the motor can be variably set as a function of external conditions.
  • a torque of the power tool can advantageously also be changed.
  • a higher torque can be achieved and / or set when the speed is reduced.
  • the provision of this higher torque is preferably referred to as a boost function in the context of the invention.
  • a reduction in the speed preferably leads to an increase in the torque and an increase in the speed to a reduction in the torque of the power tool.
  • the power tool is a slitting device or a cut-off grinder, which are usually made available in embodiments known from the prior art with a fixed motor speed. It represents a departure from the state of the art to provide such device types with different speeds and torques that can be set automatically or by the user in order to be able to react better and more flexibly to different application requirements and changes in external conditions.
  • the electrical devices are provided with exactly two different speed options, so that a first and a second operating state of the electrical tool can be made possible. But it can in the sense of the invention It may also be preferred that a user can essentially continuously or fluently choose between a multiplicity of pair combinations of speed and torque. For example, three, four, five, six or more speed possibilities or combinations of speed and torque are also conceivable.
  • the provision of the different combinations of speed and torque is achieved in particular through the design of the preferably brushless motor. If, for example, the motor can serve load points with the same output of + 10% torque, it is possible, for example, to provide two load points. The user can perceive an increase in torque of 10%, for example, and it typically also affects the progress of work. If a design of the motor can handle an increase in torque of more than + 10%, then, for example, three or more combinations of speed and torque can also be provided.
  • the invention advantageously represents a possibility of activating the boost function by the user when more torque is required for the efficient implementation of the application. As a result, a high level of work efficiency can advantageously be achieved by adapting the power distribution depending on the application conditions.
  • the highest possible speeds are preferably provided so that the electrical device for processing an average subsurface has a minimum amount of torque in order to cope with its task.
  • a cutting power of the electrical device is determined by the speed if the torque is sufficiently high.
  • Fig. 1 shows a view of possible characteristics for the motor of a power tool.
  • a first characteristic curve and a second characteristic curve are shown, which correspond to a relationship between the variables “torque” (horizontal axis) and “speed” (vertical axis).
  • the two characteristic curves preferably correspond to the ratio of torque and speed in different operating states of the power tool.
  • the first characteristic curve can correspond to the standard operating state under ideal boundary conditions, while the second characteristic curve corresponds to the boost operating state of the power tool, which can be set or switched on in particular under difficult external conditions.
  • the characteristic curves shown have been schematized and idealized.
  • the power of a power tool is determined by the physical quantities of torque and engine speed.
  • the relationship between torque and speed can be understood using diagrams that contain characteristic curves, as in Fig. 1 shown. These characteristics are preferably obtained from points in the diagram that each correspond to a speed and a torque.
  • the points that indicate a combination of torque and speed can also be referred to as the operating points of the power tool or its motor.
  • the torque of a power tool can advantageously be shifted from low values (characteristic curve 1) to higher values (characteristic curve 2).
  • Fig. 1 The shift of the characteristic is shown in Fig. 1 indicated by the arrows.
  • the vertical arrow pointing down in the left half of the picture represents the reduction in speed that can be associated with the change in the operating state from the first to the second operating state. For example, this change can correspond to switching from normal operation of the power tool to boost operation.
  • the inclined, dashed arrow preferably symbolizes the increase in torque when switching the power tool from a first to a second operating state, for example when switching from normal to boost mode of the power tool.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
EP20151128.4A 2020-01-10 2020-01-10 Procédé de fourniture d'une fonction boost pour un outil électrique, ainsi qu'outil électrique pourvu de moteur Withdrawn EP3848160A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20151128.4A EP3848160A1 (fr) 2020-01-10 2020-01-10 Procédé de fourniture d'une fonction boost pour un outil électrique, ainsi qu'outil électrique pourvu de moteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20151128.4A EP3848160A1 (fr) 2020-01-10 2020-01-10 Procédé de fourniture d'une fonction boost pour un outil électrique, ainsi qu'outil électrique pourvu de moteur

Publications (1)

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EP3848160A1 true EP3848160A1 (fr) 2021-07-14

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EP20151128.4A Withdrawn EP3848160A1 (fr) 2020-01-10 2020-01-10 Procédé de fourniture d'une fonction boost pour un outil électrique, ainsi qu'outil électrique pourvu de moteur

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4289534A1 (fr) * 2022-06-07 2023-12-13 Hilti Aktiengesellschaft Procédé permettant de faire fonctionner une machine-outil ayant des caractéristiques différentes d'appareil et de moteur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041878A1 (de) * 2009-09-07 2011-03-10 C. & E. Fein Gmbh Steuerbarer Gleichstrom-Motor mit modifizierter Kennlinie
US20140242890A1 (en) * 2013-02-22 2014-08-28 Robert Bosch Gmbh Handheld Power Tool
DE102015217053A1 (de) * 2015-09-07 2017-03-09 Robert Bosch Gmbh Handwerkzeugmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041878A1 (de) * 2009-09-07 2011-03-10 C. & E. Fein Gmbh Steuerbarer Gleichstrom-Motor mit modifizierter Kennlinie
US20140242890A1 (en) * 2013-02-22 2014-08-28 Robert Bosch Gmbh Handheld Power Tool
DE102015217053A1 (de) * 2015-09-07 2017-03-09 Robert Bosch Gmbh Handwerkzeugmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4289534A1 (fr) * 2022-06-07 2023-12-13 Hilti Aktiengesellschaft Procédé permettant de faire fonctionner une machine-outil ayant des caractéristiques différentes d'appareil et de moteur

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