US20130153255A1 - Hand-Held Machine Tool - Google Patents
Hand-Held Machine Tool Download PDFInfo
- Publication number
- US20130153255A1 US20130153255A1 US13/818,933 US201113818933A US2013153255A1 US 20130153255 A1 US20130153255 A1 US 20130153255A1 US 201113818933 A US201113818933 A US 201113818933A US 2013153255 A1 US2013153255 A1 US 2013153255A1
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- United States
- Prior art keywords
- power tool
- hand power
- output shaft
- input shaft
- cam mechanism
- Prior art date
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- Abandoned
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
- G01N29/40—Detecting the response signal, e.g. electronic circuits specially adapted therefor by amplitude filtering, e.g. by applying a threshold or by gain control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2965—Measuring attenuation of transmitted waves
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- 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
- B25F5/006—Vibration damping means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
- G01F23/2967—Acoustic waves making use of acoustical resonance or standing waves for discrete levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/022—Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02818—Density, viscosity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0427—Flexural waves, plate waves, e.g. Lamb waves, tuning fork, cantilever
Definitions
- the invention is based on a hand power tool according to the preamble of claim 1 .
- the invention is based on a hand power tool comprising a drive unit, a transmission unit, which has at least one input shaft and at least one output shaft that is operatively connected to the input shaft, and comprising a tool receiver, which can be driven in an oscillating manner, via the output shaft, about a rotational symmetry axis of the output shaft.
- the hand power tool has a vibration compensating unit, which has at least one compensating mass that, for the purpose of compensating a vibration, in at least one operating state, is driven contrary to a direction of motion of the tool receiver.
- a “compensating mass” is to be understood to mean a component provided to compensate vibrations, at least partially, preferably fully, in an operating state.
- “Vibrations” are to be understood to mean, in particular, unwanted motions of the hand power tool that are caused, in particular, by moments of inertia produced by an oscillating motion.
- the compensating mass according to the invention enables vibrations to be reduced, preferably reduced to zero, when the hand power tool is in an operating state.
- the transmission unit has at least one first cam mechanism, which is provided to drive the tool receiver, and has at least one second cam mechanism, which is provided to drive the compensating mass.
- a “cam mechanism” is to be understood to mean, in particular, a mechanism by which a shape of a moving curve is picked up by a feeler and transmitted to a further transmission element such as, for example, to the output shaft.
- the cam mechanism has at least one eccentric element.
- an “eccentric element” is to be understood to mean a component, in particular a disk-shaped component, whose center point, and preferably also whose center of gravity are disposed so as to be spaced apart from a rotation axis of the component.
- a “disk-shaped component” is to be understood to mean, in particular, a component whose material extent in the radial direction is at least 10% of a diameter of the component, an axial extent of the component preferably being less than 10% of the diameter.
- the transmission unit according to the invention can be designed in an inexpensive and particularly robust manner.
- the drive unit can drive the first and the second cam mechanism. Consequently, only one drive unit is required to generate two motions, in particular two mutually opposing motions, of two components that differ from each other.
- the hand power tool can be designed, particularly advantageously, to be small and easy to manipulate.
- a first eccentric element of the first cam mechanism and a second eccentric element of the second cam mechanism are disposed on the input shaft. Since the first eccentric element of the first cam mechanism and the second eccentric element of the second cam mechanism are disposed on the input shaft, an advantageously compact structural design can be achieved. Also conceivable, however, as alternatives or in addition to the cam mechanisms constituted by eccentric elements, are other cam mechanisms, considered appropriate by persons skilled in the art, for converting a rotary motion into an oscillating swivel motion.
- the eccentric elements are offset in relation to each other by at least substantially 180°.
- “at least substantially 180°” is to be understood to mean that a first straight line through the center point of the first eccentric element and through the rotation axis of the input shaft, which straight line runs perpendicularly in relation to a rotation axis of the input shaft, and a second straight line through the center point of the second eccentric element and through the rotation axis of the input shaft, which straight line runs perpendicularly in relation to the rotation axis of the input shaft, enclose an angle that, in particular, is less than 20°, preferably less than 10°, particularly preferably less than 5°, the center points of the first and the second eccentric elements being disposed, in a radial direction of the input shaft, on mutually at least substantially opposite sides of the input shaft.
- the first and the second straight line are disposed parallelwise in relation to each other, the center points of the first and the second eccentric element being disposed, in the radial direction of the input shaft, on mutually opposite sides of the input shaft.
- the disposition, according to the invention, of the first and the second eccentric element enables an imbalance of the first and the second eccentric element to be compensated in an advantageously simple manner.
- the hand power tool has an angled motion converter, via which the compensating mass of the vibration compensating unit is operatively connected to the second cam mechanism.
- a “motion converter” is to be understood to mean a component provided to convert a rotary motion of the drive unit into an oscillating motion of the compensating mass about the rotational symmetry axis of the output shaft.
- “Angled” is to be understood to mean, in particular, a change in the direction of extent of between 45° and 135°, preferably of between 70° and 110°, and particularly preferably of 90°.
- the design, according to the invention, of the angled motion converter enables the motion converter to be realized, advantageously, in a space-saving manner and, consequently, an advantageously compact structural design of the transmission unit can be achieved.
- the compensating mass of the vibration compensating unit and the angled motion converter are realized in an at least partially integral manner.
- “Integral” is to be understood to mean, in particular, connected by material bonding such as, for example, by a welding process and/or adhesive bonding process, etc. and, particularly advantageously, formed-on, such as being produced from a casting and/or being produced by a single-component or multi-component injection molding method.
- material bonding such as, for example, by a welding process and/or adhesive bonding process, etc.
- formed-on such as being produced from a casting and/or being produced by a single-component or multi-component injection molding method.
- savings in components can be made, and as a result, advantageously, an assembly process can be simplified.
- the compensating mass of the vibration compensating unit is rotatably mounted on the output shaft. This makes it possible to achieve a reduction in vibrations in an advantageously effective and, at the same time, simple manner, in particular the reduction of vibrations to zero, when the hand power tool is in an operating state, thereby advantageously enabling the operating comfort for the user to be increased.
- FIG. 1 shows a perspective side view of a hand power tool according to the invention
- FIG. 2 shows a schematic sectional representation of a partial region of the hand power tool with a transmission unit according to the invention and with a portion of a drive unit,
- FIG. 3 shows a schematic sectional representation of the transmission unit of the hand power tool according to the invention, along the line III-III, and
- FIG. 4 shows a schematic sectional representation of the transmission unit of the hand power tool according to the invention, along the line IV-IV.
- FIG. 1 shows a hand power tool, which can be driven in an oscillating manner and which has a switch 38 , for switching the hand power tool on and off, integrated into a housing 36 of the hand power tool that serves as a handle.
- a tool receiver 18 Disposed in a front region of the hand power tool is a tool receiver 18 , with an insert tool 40 held therein.
- the hand power tool comprises a drive unit 10 , constituted by an electric motor, not represented in greater detail, and a transmission unit 12 .
- the hand power tool has an electric power cable 44 for supplying electric power to the drive unit 10 .
- the transmission unit 12 of the hand power tool is represented in greater detail in FIG. 2 .
- the transmission unit 12 has an input shaft 14 , which can be driven in rotation by means of the drive unit 10 and which is operatively connected to a first and a second cam mechanism 30 , 32 .
- the first cam mechanism 30 has a first eccentric element 31 , which is pressed on to a free end of the input shaft 14 .
- the second cam mechanism 32 has a second eccentric element 33 , which likewise is pressed on to the input shaft 14 .
- the eccentric elements 31 , 33 are identical in their structural design and are disposed with an offset of 180°, such that a center of gravity S 1 of the first eccentric element 31 , corresponding to a center point of the first eccentric element 31 , and a center of gravity S 2 of the second eccentric element 33 , corresponding to a center point of the second eccentric element 33 , are disposed in series in a radial direction 46 of the input shaft 14 .
- the first eccentric element 31 is operatively connected to an output shaft 16 of the transmission unit 12 via a first motion converter 48 configured in a level manner.
- “Configured in a level manner” is to be understood to mean, in particular, that the first motion converter 48 extends, at least substantially, in a plane disposed parallelwise in relation to the input shaft 14 of the drive unit 10 and perpendicularly in relation to the output shaft 16 of the transmission unit 12 .
- “At least substantially” in this case is to be understood to mean, in particular, that the first motion converter 48 , with the plane, encloses an angle that, in particular, is less than 15°, particularly preferably is less than 5°. In this exemplary embodiment, the first motion converter 48 is parallel to the plane.
- the first motion converter 48 has a first region 50 that faces toward the insert tool 40 in the direction of main extent 42 of the hand power tool and that has a circular recess 52 , into which the output shaft 16 is pressed. Furthermore, the first motion converter 48 has a second region 54 , which extends, from an end of the first region 50 that faces away from the insert tool 40 , in the direction of main extent 42 , to the drive unit 10 .
- the second region 54 of the first motion converter 48 has two arms 56 . Ends of the arms 56 of the second region 54 of the first motion converter 48 that face toward the drive unit 10 engage, on opposing sides of the first eccentric element 31 , on a circumferential surface 58 .
- the output shaft 16 of the transmission unit 12 extends, perpendicularly in relation to the direction of main extent 42 of the hand power tool, as viewed from the first motion converter 48 , toward the tool receiver 18 .
- the output shaft 16 is mounted by two bearings 62 , 64 so as to be rotatable relative to the housing 36 of the hand power tool.
- the tool receiver 18 is disposed on an end of the output shaft 16 that faces away from the first motion converter 48 .
- the tool receiver 18 comprises a seating flange 66 , which is pressed on to the output shaft 16 and on which the insert tool 40 is seated when in a mounted state.
- the tool receiver 18 comprises a fastening screw 68 , which, extending through the insert tool 40 , is screwed into a threaded bore, not represented in greater detail, in the output shaft 16 .
- a screw head 70 of the fastening screw 68 is supported, in respect of the insert tool 40 , on a washer 72 .
- the insert tool 40 fixes positively relative to the output shaft 16 .
- a second motion converter 34 which has an angled configuration, engages on the second eccentric element 33 .
- the second motion converter 34 is configured with a 90° angle, and comprises a first region 74 and a second region 76 .
- the first region 74 of the second motion converter 34 is disposed parallelwise in relation to the input shaft 14 and is connected to a vibration compensating unit 20 .
- the second region 76 of the second motion converter 34 adjoins an end of the first region 74 that faces away from the output shaft 16 , and extends, parallelwise in relation to the output shaft 16 , in an axial direction 60 of the output shaft, toward the input shaft 14 .
- the second region 76 of the second motion converter 34 has two arms 78 , the free ends of which, facing toward the input shaft 14 , engage on opposing sides of a circumferential surface 80 of the second eccentric element 33 .
- the vibration compensating unit 20 is constituted by a compensating mass 22 that is realized so as to be integral with the second motion converter 34 and disposed so as to be rotatable about the output shaft 16 .
- a center of gravity S 3 of the compensating mass 22 is disposed on a side of the output shaft 16 that faces toward the drive unit 10 , in a radial direction 82 of the output shaft.
- a center of gravity S 4 of the insert tool 40 is disposed on the side of the output shaft 16 that is opposite the center of gravity S 3 of the compensating mass 22 , in the radial direction 82 of the output shaft 16 .
- the input shaft 14 , and the eccentric elements 31 , 33 disposed on the input shaft 14 are driven in rotation by the drive unit 10 .
- the eccentric motion of the first eccentric element 31 is taken up by the first motion converter 48 in a plane in which a rotational symmetry axis of the input shaft 14 is located, and which is perpendicular to the output shaft 16 .
- the eccentric motion of the second eccentric element 33 is taken up by the second motion converter 34 in a plane that extends parallelwise in relation to the direction of main extent 42 of the hand power tool and that is perpendicular to the output shaft 16 .
- Produced as a result is an oscillating motion 28 of the first and the second motion converter 34 , 48 about an axis that corresponds to a rotational symmetry axis 84 of the output shaft 16 .
- the oscillating motion 28 of the first motion converter 48 is transmitted, via the output shaft 16 , to the tool receiver 18 and to the insert tool 40 held therein.
- the oscillating motion 28 of the second motion converter 34 is transmitted to the compensating mass 22 , which is integrally connected to the second motion converter 34 and rotatably mounted on the output shaft 16 of the transmission unit 12 .
- FIG. 3 shows a sectional view along the line III-III.
- the centers of gravity S 1 and S 2 of the eccentric elements 31 , 33 when in the position shown, lie on a straight line that is perpendicular to the direction of main extent 42 and parallel to the axial direction 60 .
- the arms 56 of the first motion converter 48 bear against opposing sides of a circumferential surface 58 of the first eccentric element 31 in the radial direction 46 of the input shaft 14 .
- the arms 78 of the second motion converter 34 bear against the circumferential surface 80 of the second eccentric element 33 in the radial direction 46 of the input shaft 14 .
- FIG. 4 shows a portion of the hand power tool, in a section along the line IV-IV.
- the first motion converter 48 comprises the first region 50 having the recess 52 , and comprises the second region 54 having the two arms 56 .
- the ends of the arms 56 engage on the circumferential surface 58 of the first eccentric element 31 , which is represented in section.
- the ends of the arms 78 of the second motion converter 34 engage on the circumferential surface 80 of the second eccentric element 33 , which is likewise represented in section.
- a rotary motion 26 of the drive unit 10 and of the input shaft 14 driven by the drive unit 10 is transmitted to the first and the second eccentric element 31 , 33 that are pressed on to the input shaft 14 .
- the first and the second eccentric element 31 , 33 in this case describe an orbit, which is other than a circle, about a rotational symmetry axis 86 of the input shaft 14 .
- the ends of the arms 56 , 78 of the first and the second motion converter 34 , 48 each respectively take up a component of the non-circular motion of the first and the second eccentric element 31 , 33 in a direction that is perpendicular to the direction of main extent 42 of the hand power tool and perpendicular to the axial direction 60 of the output shaft 16 .
- “non-circular” is to be understood to mean, in particular, being at least substantially different from a circle.
- This component of the non-circular motion of the eccentric elements 31 , 33 causes an opposing oscillating motion 28 of the first and the second motion converter 34 , 48 about the rotational symmetry axis 84 of the output shaft 16 .
- the oscillating motion 28 of the first motion converter 48 is transmitted to the output shaft 16 pressed into the recess 52 , and to the insert tool 40 that is fastened to the output shaft via the tool receiver 18 .
- the oscillating motion 28 of the second motion converter 34 is transmitted to the compensating mass 22 of the vibration compensating unit 20 that is integrally formed on to the second motion converter 34 .
Abstract
The disclosure relates to a hand-held machine tool, comprising a drive unit, a gearbox unit, which comprises at least one input shaft and at least one output shaft operatively connected to the input shaft, and a tool holder, which is configured to be driven via the output shaft of the gearbox unit in an oscillating manner about an axis of rotational symmetry of the output shaft. A vibration compensating unit is proposed, which comprises at least one compensating mass which, in order to compensate for a vibration, is driven in at least one operating state against a direction of movement of the tool holder.
Description
- The invention is based on a hand power tool according to the preamble of claim 1.
- There are already known hand power tools comprising a drive unit, a transmission unit, which has at least one input shaft and at least one output shaft that is operatively connected to the input shaft, and comprising a tool receiver, which can be driven in an oscillating manner, via the output shaft of the transmission unit, about a rotational symmetry axis of the output shaft.
- The invention is based on a hand power tool comprising a drive unit, a transmission unit, which has at least one input shaft and at least one output shaft that is operatively connected to the input shaft, and comprising a tool receiver, which can be driven in an oscillating manner, via the output shaft, about a rotational symmetry axis of the output shaft.
- It is proposed that the hand power tool has a vibration compensating unit, which has at least one compensating mass that, for the purpose of compensating a vibration, in at least one operating state, is driven contrary to a direction of motion of the tool receiver. A “compensating mass” is to be understood to mean a component provided to compensate vibrations, at least partially, preferably fully, in an operating state. “Vibrations” are to be understood to mean, in particular, unwanted motions of the hand power tool that are caused, in particular, by moments of inertia produced by an oscillating motion. The compensating mass according to the invention enables vibrations to be reduced, preferably reduced to zero, when the hand power tool is in an operating state. As a result, advantageously, comfort in operation of the hand power tool can be increased for a user. In addition, noises resulting from unwanted vibrations when the hand power tool is in an operating state can be advantageously reduced, such that, particularly advantageously, the operating comfort can be increased for the user. In addition, the reduction of the vibrations, in particular the reduction of the vibrations to zero, makes it possible to achieve an advantageously precise working result when the hand power tool is in an operating state.
- Further, it is proposed that the transmission unit has at least one first cam mechanism, which is provided to drive the tool receiver, and has at least one second cam mechanism, which is provided to drive the compensating mass. A “cam mechanism” is to be understood to mean, in particular, a mechanism by which a shape of a moving curve is picked up by a feeler and transmitted to a further transmission element such as, for example, to the output shaft. Particularly preferably, the cam mechanism has at least one eccentric element. In this context, an “eccentric element” is to be understood to mean a component, in particular a disk-shaped component, whose center point, and preferably also whose center of gravity are disposed so as to be spaced apart from a rotation axis of the component. A “disk-shaped component” is to be understood to mean, in particular, a component whose material extent in the radial direction is at least 10% of a diameter of the component, an axial extent of the component preferably being less than 10% of the diameter.
- Owing to the first and the second cam mechanism, a rotary motion of the drive unit can be easily converted into an oscillating motion. In addition, advantageously, the transmission unit according to the invention can be designed in an inexpensive and particularly robust manner.
- If the first cam mechanism and the second cam mechanism are operatively coupled to the drive unit, the drive unit can drive the first and the second cam mechanism. Consequently, only one drive unit is required to generate two motions, in particular two mutually opposing motions, of two components that differ from each other. Advantageously, it is thereby possible to save structural space, with the result that the hand power tool can be designed, particularly advantageously, to be small and easy to manipulate.
- In addition, it is proposed that a first eccentric element of the first cam mechanism and a second eccentric element of the second cam mechanism are disposed on the input shaft. Since the first eccentric element of the first cam mechanism and the second eccentric element of the second cam mechanism are disposed on the input shaft, an advantageously compact structural design can be achieved. Also conceivable, however, as alternatives or in addition to the cam mechanisms constituted by eccentric elements, are other cam mechanisms, considered appropriate by persons skilled in the art, for converting a rotary motion into an oscillating swivel motion.
- In a further design of the invention, it is proposed that the eccentric elements are offset in relation to each other by at least substantially 180°. In this context, “at least substantially 180°” is to be understood to mean that a first straight line through the center point of the first eccentric element and through the rotation axis of the input shaft, which straight line runs perpendicularly in relation to a rotation axis of the input shaft, and a second straight line through the center point of the second eccentric element and through the rotation axis of the input shaft, which straight line runs perpendicularly in relation to the rotation axis of the input shaft, enclose an angle that, in particular, is less than 20°, preferably less than 10°, particularly preferably less than 5°, the center points of the first and the second eccentric elements being disposed, in a radial direction of the input shaft, on mutually at least substantially opposite sides of the input shaft. In a particularly advantageous design, the first and the second straight line are disposed parallelwise in relation to each other, the center points of the first and the second eccentric element being disposed, in the radial direction of the input shaft, on mutually opposite sides of the input shaft. The disposition, according to the invention, of the first and the second eccentric element enables an imbalance of the first and the second eccentric element to be compensated in an advantageously simple manner.
- It is proposed that the hand power tool has an angled motion converter, via which the compensating mass of the vibration compensating unit is operatively connected to the second cam mechanism. In this context, a “motion converter” is to be understood to mean a component provided to convert a rotary motion of the drive unit into an oscillating motion of the compensating mass about the rotational symmetry axis of the output shaft. “Angled” is to be understood to mean, in particular, a change in the direction of extent of between 45° and 135°, preferably of between 70° and 110°, and particularly preferably of 90°. The design, according to the invention, of the angled motion converter enables the motion converter to be realized, advantageously, in a space-saving manner and, consequently, an advantageously compact structural design of the transmission unit can be achieved.
- It is proposed that the compensating mass of the vibration compensating unit and the angled motion converter are realized in an at least partially integral manner. “Integral” is to be understood to mean, in particular, connected by material bonding such as, for example, by a welding process and/or adhesive bonding process, etc. and, particularly advantageously, formed-on, such as being produced from a casting and/or being produced by a single-component or multi-component injection molding method. Preferably, owing to the integral design of the motion converter and of the compensating unit, savings in components can be made, and as a result, advantageously, an assembly process can be simplified.
- It is further proposed that the compensating mass of the vibration compensating unit is rotatably mounted on the output shaft. This makes it possible to achieve a reduction in vibrations in an advantageously effective and, at the same time, simple manner, in particular the reduction of vibrations to zero, when the hand power tool is in an operating state, thereby advantageously enabling the operating comfort for the user to be increased.
- Further advantages are given by the following description of the drawing. The drawing shows an exemplary embodiment of the invention. The drawing, the description and the claims contain numerous features in combination. Persons skilled in the art will also expediently consider the features individually and combine them to create appropriate further combinations.
- In the drawing:
-
FIG. 1 shows a perspective side view of a hand power tool according to the invention, -
FIG. 2 shows a schematic sectional representation of a partial region of the hand power tool with a transmission unit according to the invention and with a portion of a drive unit, -
FIG. 3 shows a schematic sectional representation of the transmission unit of the hand power tool according to the invention, along the line III-III, and -
FIG. 4 shows a schematic sectional representation of the transmission unit of the hand power tool according to the invention, along the line IV-IV. -
FIG. 1 shows a hand power tool, which can be driven in an oscillating manner and which has aswitch 38, for switching the hand power tool on and off, integrated into ahousing 36 of the hand power tool that serves as a handle. Disposed in a front region of the hand power tool is atool receiver 18, with aninsert tool 40 held therein. In addition, the hand power tool comprises adrive unit 10, constituted by an electric motor, not represented in greater detail, and atransmission unit 12. In a region that faces away from thetool receiver 18 in a direction ofmain extent 42 of the hand power tool, the hand power tool has anelectric power cable 44 for supplying electric power to thedrive unit 10. - The
transmission unit 12 of the hand power tool is represented in greater detail inFIG. 2 . Thetransmission unit 12 has aninput shaft 14, which can be driven in rotation by means of thedrive unit 10 and which is operatively connected to a first and asecond cam mechanism first cam mechanism 30 has a firsteccentric element 31, which is pressed on to a free end of theinput shaft 14. Thesecond cam mechanism 32 has a secondeccentric element 33, which likewise is pressed on to theinput shaft 14. Theeccentric elements eccentric element 31, corresponding to a center point of the firsteccentric element 31, and a center of gravity S2 of the secondeccentric element 33, corresponding to a center point of the secondeccentric element 33, are disposed in series in aradial direction 46 of theinput shaft 14. The firsteccentric element 31 is operatively connected to anoutput shaft 16 of thetransmission unit 12 via afirst motion converter 48 configured in a level manner. “Configured in a level manner” is to be understood to mean, in particular, that thefirst motion converter 48 extends, at least substantially, in a plane disposed parallelwise in relation to theinput shaft 14 of thedrive unit 10 and perpendicularly in relation to theoutput shaft 16 of thetransmission unit 12. “At least substantially” in this case is to be understood to mean, in particular, that thefirst motion converter 48, with the plane, encloses an angle that, in particular, is less than 15°, particularly preferably is less than 5°. In this exemplary embodiment, thefirst motion converter 48 is parallel to the plane. - The
first motion converter 48 has afirst region 50 that faces toward theinsert tool 40 in the direction ofmain extent 42 of the hand power tool and that has acircular recess 52, into which theoutput shaft 16 is pressed. Furthermore, thefirst motion converter 48 has asecond region 54, which extends, from an end of thefirst region 50 that faces away from theinsert tool 40, in the direction ofmain extent 42, to thedrive unit 10. Thesecond region 54 of thefirst motion converter 48 has twoarms 56. Ends of thearms 56 of thesecond region 54 of thefirst motion converter 48 that face toward thedrive unit 10 engage, on opposing sides of the firsteccentric element 31, on acircumferential surface 58. - The
output shaft 16 of thetransmission unit 12 extends, perpendicularly in relation to the direction ofmain extent 42 of the hand power tool, as viewed from thefirst motion converter 48, toward thetool receiver 18. Theoutput shaft 16 is mounted by twobearings housing 36 of the hand power tool. Thetool receiver 18 is disposed on an end of theoutput shaft 16 that faces away from thefirst motion converter 48. Thetool receiver 18 comprises aseating flange 66, which is pressed on to theoutput shaft 16 and on which theinsert tool 40 is seated when in a mounted state. In addition, thetool receiver 18 comprises afastening screw 68, which, extending through theinsert tool 40, is screwed into a threaded bore, not represented in greater detail, in theoutput shaft 16. When in a mounted state, ascrew head 70 of thefastening screw 68 is supported, in respect of theinsert tool 40, on awasher 72. When in a mounted state, theinsert tool 40 fixes positively relative to theoutput shaft 16. - A
second motion converter 34, which has an angled configuration, engages on the secondeccentric element 33. Thesecond motion converter 34 is configured with a 90° angle, and comprises afirst region 74 and asecond region 76. Thefirst region 74 of thesecond motion converter 34 is disposed parallelwise in relation to theinput shaft 14 and is connected to avibration compensating unit 20. Thesecond region 76 of thesecond motion converter 34 adjoins an end of thefirst region 74 that faces away from theoutput shaft 16, and extends, parallelwise in relation to theoutput shaft 16, in anaxial direction 60 of the output shaft, toward theinput shaft 14. Thesecond region 76 of thesecond motion converter 34 has twoarms 78, the free ends of which, facing toward theinput shaft 14, engage on opposing sides of acircumferential surface 80 of the secondeccentric element 33. - The
vibration compensating unit 20 is constituted by a compensatingmass 22 that is realized so as to be integral with thesecond motion converter 34 and disposed so as to be rotatable about theoutput shaft 16. A center of gravity S3 of the compensatingmass 22 is disposed on a side of theoutput shaft 16 that faces toward thedrive unit 10, in aradial direction 82 of the output shaft. A center of gravity S4 of theinsert tool 40 is disposed on the side of theoutput shaft 16 that is opposite the center of gravity S3 of the compensatingmass 22, in theradial direction 82 of theoutput shaft 16. - When the hand power tool is in an operating state, the
input shaft 14, and theeccentric elements input shaft 14, are driven in rotation by thedrive unit 10. The eccentric motion of the firsteccentric element 31 is taken up by thefirst motion converter 48 in a plane in which a rotational symmetry axis of theinput shaft 14 is located, and which is perpendicular to theoutput shaft 16. The eccentric motion of the secondeccentric element 33 is taken up by thesecond motion converter 34 in a plane that extends parallelwise in relation to the direction ofmain extent 42 of the hand power tool and that is perpendicular to theoutput shaft 16. Produced as a result is anoscillating motion 28 of the first and thesecond motion converter rotational symmetry axis 84 of theoutput shaft 16. - The
oscillating motion 28 of thefirst motion converter 48 is transmitted, via theoutput shaft 16, to thetool receiver 18 and to theinsert tool 40 held therein. Theoscillating motion 28 of thesecond motion converter 34 is transmitted to the compensatingmass 22, which is integrally connected to thesecond motion converter 34 and rotatably mounted on theoutput shaft 16 of thetransmission unit 12. - Owing to the phase displacement of the
oscillating motions 28 of the first and thesecond motion converter tool receiver 18 and the compensatingmass 22, vibrations that are caused by moments of inertia produced by anoscillating motion 28 of theinsert tool 40 when the hand power tool is in an operating state are compensated by the compensating mass. -
FIG. 3 shows a sectional view along the line III-III. The centers of gravity S1 and S2 of theeccentric elements main extent 42 and parallel to theaxial direction 60. Thearms 56 of thefirst motion converter 48 bear against opposing sides of acircumferential surface 58 of the firsteccentric element 31 in theradial direction 46 of theinput shaft 14. Thearms 78 of thesecond motion converter 34 bear against thecircumferential surface 80 of the secondeccentric element 33 in theradial direction 46 of theinput shaft 14. -
FIG. 4 shows a portion of the hand power tool, in a section along the line IV-IV. Thefirst motion converter 48 comprises thefirst region 50 having therecess 52, and comprises thesecond region 54 having the twoarms 56. The ends of thearms 56 engage on thecircumferential surface 58 of the firsteccentric element 31, which is represented in section. The ends of thearms 78 of thesecond motion converter 34 engage on thecircumferential surface 80 of the secondeccentric element 33, which is likewise represented in section. - When the hand power tool is in an operating state, a
rotary motion 26 of thedrive unit 10 and of theinput shaft 14 driven by thedrive unit 10 is transmitted to the first and the secondeccentric element input shaft 14. The first and the secondeccentric element rotational symmetry axis 86 of theinput shaft 14. The ends of thearms second motion converter eccentric element main extent 42 of the hand power tool and perpendicular to theaxial direction 60 of theoutput shaft 16. In this context, “non-circular” is to be understood to mean, in particular, being at least substantially different from a circle. This component of the non-circular motion of theeccentric elements motion 28 of the first and thesecond motion converter rotational symmetry axis 84 of theoutput shaft 16. - The
oscillating motion 28 of thefirst motion converter 48 is transmitted to theoutput shaft 16 pressed into therecess 52, and to theinsert tool 40 that is fastened to the output shaft via thetool receiver 18. Theoscillating motion 28 of thesecond motion converter 34 is transmitted to the compensatingmass 22 of thevibration compensating unit 20 that is integrally formed on to thesecond motion converter 34.
Claims (8)
1. A hand power tool comprising:
a drive unit;
a transmission unit including (i) at least one input shaft and (ii) at least one output shaft operatively connected to the input shaft;
a tool receiver configured to be driven in an oscillating manner, via the output shaft of the transmission unit, about a rotational symmetry axis of the output shaft; and
a vibration compensating unit including at least one compensating mass that, in at least one operating state, is configured to be driven contrary to a direction of motion of the tool receiver,
wherein the vibration compensation unit is configured to compensate a vibration.
2. The hand power tool as claimed in claim 1 , wherein the transmission unit includes (i) at least one first cam mechanism configured to drive the tool receiver, and (ii) at least one second cam mechanism configured to drive the compensating mass.
3. The hand power tool as claimed in claim 2 , wherein the first cam mechanism and the second cam mechanism are operatively coupled to the drive unit.
4. The hand power tool as claimed in claim 3 , wherein:
the first cam mechanism includes a first eccentric element disposed on the input shaft, and
the second cam mechanism includes a second eccentric element disposed on the input shaft.
5. The hand power tool as claimed in claim 4 , wherein the first eccentric element and the second eccentric element are offset in relation to each other by at least substantially 180°.
6. The hand power tool as claimed in claim 2 , further comprising:
an angled motion converter configured to operatively connect the compensating mass of the vibration compensating unit to the second cam mechanism.
7. The hand power tool as claimed in claim 6 , wherein the compensating mass of the vibration compensating unit and the angled motion converter are realized in an at least partially integral manner.
8. The hand power tool as claimed in claim 1 , wherein the compensating mass of the vibration compensating unit is rotatably mounted on the output shaft.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102010040219.2 | 2010-09-03 | ||
DE102010040219A DE102010040219A1 (en) | 2010-09-03 | 2010-09-03 | Vibronic gauge |
PCT/EP2011/063037 WO2012025329A1 (en) | 2010-08-26 | 2011-07-28 | Hand-held machine tool |
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US20130153255A1 true US20130153255A1 (en) | 2013-06-20 |
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US13/818,933 Abandoned US20130153255A1 (en) | 2010-09-03 | 2011-07-28 | Hand-Held Machine Tool |
US13/818,855 Active 2033-04-26 US9575035B2 (en) | 2010-09-03 | 2011-08-09 | Vibronic measuring device |
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Application Number | Title | Priority Date | Filing Date |
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US13/818,855 Active 2033-04-26 US9575035B2 (en) | 2010-09-03 | 2011-08-09 | Vibronic measuring device |
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US (2) | US20130153255A1 (en) |
EP (1) | EP2612116B1 (en) |
CN (1) | CN103080706B (en) |
DE (1) | DE102010040219A1 (en) |
WO (1) | WO2012028426A2 (en) |
Cited By (2)
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US9512908B2 (en) | 2013-01-07 | 2016-12-06 | C. & E. Fein Gmbh | Oscillatingly driven power tools with toothed belt drive |
CN107538439A (en) * | 2016-06-29 | 2018-01-05 | 苏州宝时得电动工具有限公司 | Oscillating machine vibration insulating system and method and the oscillating machine with the vibration insulating system |
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CN105051517A (en) * | 2013-04-03 | 2015-11-11 | 高准公司 | Vibratory sensor and method |
DE102014113470A1 (en) * | 2014-09-18 | 2016-03-24 | Maschinenfabrik Reinhausen Gmbh | Electric device with a housing filled with insulating oil and measuring device and method for monitoring such an electrical device |
DE102014119061A1 (en) | 2014-12-18 | 2016-06-23 | Endress + Hauser Gmbh + Co. Kg | Vibronic sensor |
DE102015102834A1 (en) | 2015-02-27 | 2016-09-01 | Endress + Hauser Gmbh + Co. Kg | Vibronic sensor |
DE102015112543A1 (en) * | 2015-07-30 | 2017-02-02 | Endress+Hauser Gmbh+Co. Kg | Device for determining and / or monitoring at least one process variable |
EP3341701B1 (en) * | 2015-08-28 | 2020-03-18 | Micro Motion, Inc. | Meter and method for generating a synthetic time period output signal |
DE102022104763A1 (en) | 2022-02-28 | 2023-08-31 | Endress+Hauser SE+Co. KG | Modular field device |
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US6062070A (en) | 1996-10-29 | 2000-05-16 | Drexelbrook Controls, Inc. | Method and apparatus for the sonic measurement of sludge and clarity conditions during the treatment of waste water |
US6425293B1 (en) * | 1999-03-13 | 2002-07-30 | Textron Systems Corporation | Sensor plug |
DE10161072A1 (en) | 2001-12-12 | 2003-06-18 | Endress & Hauser Gmbh & Co Kg | Field device electronics with a sensor unit for process measurement technology |
DE10161071A1 (en) | 2001-12-12 | 2003-06-18 | Endress & Hauser Gmbh & Co Kg | Field electronic unit for process measurement technology in which a measurement sensor is provided with digital signal processing and control electronics to improve measurement accuracy and sensor reliability |
DE10237931A1 (en) | 2002-08-14 | 2004-02-26 | Endress + Hauser Gmbh + Co. Kg | Fixed, filling level monitoring, density, and viscosity measurement device, comprises a vibrator fixed at a chosen level, with a microprocessor to control feedback electronics to provide a constant phase-frequency response |
US6938488B2 (en) * | 2002-08-21 | 2005-09-06 | Battelle Memorial Institute | Acoustic inspection device |
DE10255288A1 (en) | 2002-11-26 | 2004-07-08 | Endress + Hauser Gmbh + Co. Kg | Method for determining the state of a field measuring device for process automation and process measurement technology and field measuring device for carrying out the method |
US7146845B2 (en) * | 2004-03-24 | 2006-12-12 | Vega Grieshaber Kg | Method for operating tests of vibration level switch sensors and corresponding vibration level switch |
DE102004018506A1 (en) * | 2004-04-14 | 2005-11-03 | Endress + Hauser Gmbh + Co. Kg | Measuring device manufacturing method for determining and/or monitoring process factor, involves modifying vibration characteristics of mechanically vibrating unit if difference between its frequencies is greater than tolerance value |
DE102005020862A1 (en) * | 2005-05-02 | 2006-11-09 | Endress + Hauser Gmbh + Co. Kg | Determining or monitoring process parameter of medium in container, by adjusting electronic component to give predetermined reference transfer function |
DE102007008669A1 (en) | 2007-02-20 | 2008-08-21 | Endress + Hauser Gmbh + Co. Kg | Method for determining and / or monitoring a process variable of a medium and corresponding device |
DE102009028022A1 (en) | 2009-07-27 | 2011-02-03 | Endress + Hauser Gmbh + Co. Kg | Method for determining and / or monitoring at least one physical process variable of a medium |
WO2011159711A1 (en) * | 2010-06-15 | 2011-12-22 | Illinois Tool Works Inc. | Ultrasonic liquid level sensor with improved temperature range |
DE102010030982A1 (en) | 2010-07-06 | 2012-01-12 | Endress + Hauser Gmbh + Co. Kg | Method for controlling the phase in a resonant circuit |
-
2010
- 2010-09-03 DE DE102010040219A patent/DE102010040219A1/en not_active Withdrawn
-
2011
- 2011-07-28 US US13/818,933 patent/US20130153255A1/en not_active Abandoned
- 2011-08-09 WO PCT/EP2011/063650 patent/WO2012028426A2/en active Application Filing
- 2011-08-09 US US13/818,855 patent/US9575035B2/en active Active
- 2011-08-09 EP EP11743513.1A patent/EP2612116B1/en active Active
- 2011-08-09 CN CN201180042577.3A patent/CN103080706B/en active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US9512908B2 (en) | 2013-01-07 | 2016-12-06 | C. & E. Fein Gmbh | Oscillatingly driven power tools with toothed belt drive |
CN107538439A (en) * | 2016-06-29 | 2018-01-05 | 苏州宝时得电动工具有限公司 | Oscillating machine vibration insulating system and method and the oscillating machine with the vibration insulating system |
Also Published As
Publication number | Publication date |
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EP2612116A2 (en) | 2013-07-10 |
CN103080706A (en) | 2013-05-01 |
WO2012028426A2 (en) | 2012-03-08 |
US20140245834A1 (en) | 2014-09-04 |
US9575035B2 (en) | 2017-02-21 |
DE102010040219A1 (en) | 2012-03-08 |
CN103080706B (en) | 2017-02-08 |
WO2012028426A3 (en) | 2012-07-05 |
EP2612116B1 (en) | 2020-12-16 |
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Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUCHS, RUDOLF;REEL/FRAME:034115/0647 Effective date: 20130409 |
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