EP2754535B1 - Machine-outil manuelle dotée d'un ventilateur - Google Patents

Machine-outil manuelle dotée d'un ventilateur Download PDF

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Publication number
EP2754535B1
EP2754535B1 EP13005911.6A EP13005911A EP2754535B1 EP 2754535 B1 EP2754535 B1 EP 2754535B1 EP 13005911 A EP13005911 A EP 13005911A EP 2754535 B1 EP2754535 B1 EP 2754535B1
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EP
European Patent Office
Prior art keywords
motor
fan
tool
hand
operated power
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.)
Active
Application number
EP13005911.6A
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German (de)
English (en)
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EP2754535A3 (fr
EP2754535A2 (fr
Inventor
Bernd Fleischmann
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.)
Festool GmbH
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Festool GmbH
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Publication date
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Publication of EP2754535A2 publication Critical patent/EP2754535A2/fr
Publication of EP2754535A3 publication Critical patent/EP2754535A3/fr
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Publication of EP2754535B1 publication Critical patent/EP2754535B1/fr
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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
    • B25F5/008—Cooling means

Definitions

  • the invention relates to manual power tool, in particular grinding device, separating device or screwdriver, according to the preamble of claim 1.
  • Such a hand-held machine tool is, for example, in US 2005/0202310 A1 explained.
  • a typical handheld power tool has a fan assembly with a fan wheel which is used to cool the hand machine tool, particularly the heat generated by the drive motor or tool motor.
  • the cooling air flow usually flows through the housing from the back to the front.
  • very complex constructions must be realized, so that the cooling works even in critical operating conditions of the hand-held machine tool.
  • a separate fan motor for example an electric fan motor, which drives the fan wheel.
  • the fan is operable at a different speed than that of the tool motor.
  • the fan is rotatably mounted with respect to the housing and with respect to the motor shaft.
  • the hand machine tool includes or is, for example, a sander, a separator, a cutter, a saw, e.g. a stitch or circular saw, a screwdriver or the like.
  • a grinding device or another manual machine tool according to the invention is additionally cooled by the fan arrangement according to the invention, in other words that of the tool motor, after operation or in connection with a large torque-requiring operation and thus generating large heat of the tool motor separate fan motor for cooling the hand-held machine tool, in particular the tool motor, contributes or even takes over this cooling alone.
  • a screwdriver in which, for example, at high speeds, a high torque is demanded, it is advantageous if an independent from the drive of the tool motor additional cooling is provided.
  • the fan motor for example, even drive the fan when the tool motor is already or still.
  • the fan motor for example, after the operation of the hand-held machine tool still resulting heat can be transported away from the housing without the tool motor continues to run. The machine is therefore much better cooled.
  • the tool motor is relieved of the cooling.
  • the hand machine tool is, for example, an electric hand machine tool.
  • the tool motor is for example an electric drive motor.
  • the cooling concept is also suitable for additional cooling, for example, a pneumatic machine tool driving their tool, that is in connection with a pneumatic tool motor.
  • the tool motor and the fan motor are thus expediently electric motors.
  • the fan motor and / or the tool motor are e.g. Continuous series motors or electronically commutated motors.
  • a fan motor can drive at least two fan wheels. If several fan wheels, for example 2 fan wheels are provided, each fan wheel can be assigned a separate fan motor. As a result, an individual control is possible, i. the respective fan wheel is operated only if it is necessary.
  • a preferred variant of the invention provides that a rated speed and / or maximum speed of the fan motor is substantially higher or substantially smaller than that of the tool motor.
  • the fan motor can provide optimum cooling performance, while the tool motor optimally serves its original purpose, namely the drive of the tool holder and the tool.
  • the large torque drive motor may rotate relatively slowly, while the fan motor causes the fan wheel to be driven at a comparatively high speed, and preferably produces a strong and / or fast flowing flow of cooling air.
  • the fan motor expediently drives a fan wheel, which is coaxial with a motor shaft of the tool motor.
  • the fan motor is coaxial with the motor shaft. It is understood that only the fan can be coaxial with the motor shaft, while the fan motor is not coaxial, or vice versa, that the fan motor is coaxial with the motor shaft, but not the fan.
  • the fan motor is thus arranged, for example, directly coaxial in the drive train of the hand-held machine tool.
  • a variant of the invention provides that the fan wheel driven by the fan motor is rotatably mounted on or on the motor shaft of the tool motor by means of a bearing arrangement.
  • the motor shaft forms a bearing base for the fan wheel and / or the fan motor.
  • this variant is also particularly suitable for replacing a fan wheel, which is usually mounted directly on the motor shaft in a rotationally fixed or rotationally fixed manner on the motor shaft, by a fan arrangement according to the invention, ie the fan motor with its fan wheel is arranged directly on the motor shaft instead of the usually fixed location there Tool motor fan is arranged.
  • a fan arrangement according to the invention ie the fan motor with its fan wheel is arranged directly on the motor shaft instead of the usually fixed location there Tool motor fan is arranged.
  • the bearing arrangement which supports the fan wheel on or on the motor shaft expediently comprises at least one roller bearing arranged between the motor shaft of the tool motor and the fan wheel which can be driven by the fan motor, for example a ball bearing, roller bearing, needle bearing or the like.
  • roller bearing arranged between the motor shaft of the tool motor and the fan wheel which can be driven by the fan motor, for example a ball bearing, roller bearing, needle bearing or the like.
  • simpler storage concepts, such as bearings readily feasible.
  • the fan wheel drivable by the fan motor is arranged for example on or in a motor housing of the tool motor.
  • the fan wheel can be arranged in an interior of a motor housing of the tool motor. It is also possible to arrange the fan wheel on the motor housing of the tool motor.
  • the motor housing of the tool motor can also be or have a holder or a holding structure for the fan motor.
  • a particularly preferred, compact embodiment of the invention provides that the fan wheel drivable by the fan motor and the fan motor form an integral structural unit.
  • the fan wheel drivable by the fan motor and the fan motor form an integral structural unit.
  • integrated into the fan or the fan impeller integrally having fan motor for example, be installed as a compact unit in the housing of the hand-held machine tool.
  • a recess for a primary part or an exciter coil arrangement of the fan motor is arranged or provided on the fan wheel.
  • the field coil arrangement can engage directly in the fan.
  • a preferred embodiment provides that the fan wheel forms a squirrel-cage rotor of the fan motor.
  • a primary part of the fan motor is suitably stationary with respect to the housing.
  • the fan forms a secondary part of the fan motor or has this secondary part.
  • the primary part comprises the exciting coil arrangement
  • the secondary part comprises, for example, a magnet arrangement, a secondary coil arrangement, a squirrel-cage rotor or the like.
  • a preferred embodiment provides that a coupling is provided, with which the fan wheel driven by the fan motor with the tool motor for driving through the tool motor can be coupled.
  • the clutch for example a centrifugal clutch, allows the tool motor, for example, from a predetermined speed, the operation of the fan wheel takes over, so that the ventilation motor can be turned off, for. just walking or standing.
  • both motors can contribute to the operation of the fan.
  • the coupling may also include a switchable coupling arm, i. a clutch which can be actuated, for example, by a magnetic drive or another drive device, for example also a spring drive device.
  • a switchable coupling arm i. a clutch which can be actuated, for example, by a magnetic drive or another drive device, for example also a spring drive device.
  • the clutch can be switched between an operation of the fan on the one hand only by the fan motor and the other hand by the tool motor alone or together with or with the aid of the fan motor.
  • the clutch couples the tool motor with the fan wheel driven by the fan motor in dependence on a rotational speed of the tool motor.
  • the fan motor takes over the operation of the fan completely or substantially, while at high speed of the tool motor, the fan at least partially drives.
  • a further embodiment of the invention provides that, on the one hand, the at least one fan wheel which can be driven by the fan motor is present, but also one or more tool motor fan wheels which can be driven or driven only by the tool motor.
  • the tool motor may have one or more directly driven by him fan wheels.
  • the tool or motor fan wheels are rotatably coupled to a motor shaft of the tool motor.
  • the respective tool motor impeller is rotatably mounted on the motor shaft, for example, penetrated by the motor shaft, or coupled by a transmission with a motor shaft of the tool motor.
  • the fan wheel or the fan assembly according to the invention which can be driven by the fan motor can also be provided with a heat sink and / or a cooling rib arrangement or serve for cooling a cooling rib arrangement or a heat sink.
  • the heat sink or fin assembly is e.g. provided on the tool motor and / or power electronics for operating the tool motor.
  • the hand-held power tool has a control and / or a control for controlling or regulating the fan motor on the basis of at least one parameter.
  • the control or regulation can also be expediently designed for controlling the fan motor for a follow-up time after switching off the tool motor.
  • the at least one parameter depends, for example, on the tool motor.
  • the at least one parameter comprises a temperature value of Tool motor, a temperature value of the housing or a speed value of the tool motor or any combination thereof.
  • Such a control or regulation makes it possible, for example, for the hand-held machine tool to respond immediately to an increase or decrease in a housing temperature or a motor temperature of the tool motor and to drive the fan motor for operating the fan wheel or for cooling the hand-held machine tool or the tool motor , eg turns on or increases its speed.
  • a kind of register cooling is possible, i. that, for example, at low speeds of the tool motor, the fan motor drives the fan and the tool motor a tool motor fan wheel, which is fixedly coupled to its motor shaft. At higher speeds of the tool motor, it is sufficient if it drives its tool motor fan and inventively additionally existing fan motor is turned off or runs at a lower power.
  • the hand-held power tools 10, 110 and 210 shown in the drawing have partly the same or similar components, which are provided with the same reference numerals, but partially with reference numbers of 100 different sizes to make differences clear.
  • the hand-held machine tools 10, 110 and 210 have housings 11, 111 and 211.
  • the housings 11 and 211 are almost identical, while the housing 211 is designed differently.
  • the hand-held machine tools 10 and 110 are, for example, separating devices or grinding devices, in particular polishing machines or angle grinders, saws or the like, while the Hand machine tool 210 represents a screwdriver or drill, or both.
  • an existing tool motor 12, 112 or 212 generates a great deal of heat during operation of the hand-held machine tool.
  • the tool motors 12, 112 and 212 are, for example, typical series-wound motors, electronically annotated motors or the like.
  • the tool motors 12, 112 and 212 drive tool holders 13, 213, for example for releasably holding a designed as a separating tool tool 14 or a tool 214 comprising, for example, a drill or a screwdriver bit.
  • the hand-held machine tools 10, 110 and 210 are, for example, mains-powered, electric hand-held power tools, for which reason power cables 15 are in each case available for connection to an electrical supply network.
  • the hand-held machine tools 10, 110, 210 could each have a battery pack.
  • the tool motors 12, 112 and 212 can be switched on and / or off by means of drive switches 16. Preferably, it is possible to also control a speed with the drive switches 16, i. For example, to specify a faster or slower operation of the tool motors 12, 112 and 212.
  • a hand-held power tool according to the invention may have a tool motor, the tool holder of Hand power tool drives directly. In the embodiment, however, transmission 18 and 218 are present.
  • the gear 18 hand tool 10 or 110 is, for example, a bevel gear comprising a directly driven by the tool motor 12 or 112 bevel gear 19 and another, meshing with the bevel gear 19 bevel gear 20th
  • the transmission 218 includes a planetary gear 219.
  • a switching element 220 such as a rotary ring or the like, different gear ratios or gears in the transmission 218 can be adjusted.
  • the gear 18 and 218 each have a tool shaft 21 on which the tool holders 13 or 213 are arranged.
  • a motor shaft 22 of the tool motor 12 or 112 drives the bevel gear 19.
  • the bevel gear 19 sits directly on the front of the motor shaft 92 and is rotatably connected thereto.
  • the motor shaft of the tool motor 212 is not shown in detail. It does not matter in this case either.
  • the motor shaft 22 of the hand machine tool 10, 110 is supported on a front bearing 23 near the gear 18 and with a rear bearing 24 on the housing 11 and 111, respectively.
  • a collector 25 of the tool motor 12 or 112 configured as a series motor.
  • the tool motor 12 or 112 or 212 may also be an electronically commutated motor.
  • the rear part or main part of the housing 11 or 111 forms a handle 17 for gripping by an operator. therefore Thus, an operator can surround the housing 11 or 111 directly on its motor housing section 58.
  • the housing 211 of the hand-held power tool 210 has a motor housing portion 258 receiving the tool motor 212 from which a handle 217, such as a gun handle, projects.
  • 58 outflow openings 26 are provided for a cooling air flow 28 to the motor housing sections.
  • the cooling air flow 28 can flow into the motor housing sections 58 through inlet openings 27 at a rear side of the housing 11, 111 facing away from the output side of the tool motors 12, 112.
  • inlet openings 227 for a cooling air flow 28 are provided on the motor housing section 258 in the case of the manual machine tool 210.
  • the cooling air flow 28 can flow from the front, the driven side of the tool motor 212 side facing the housing 211 in the motor housing portion 258 through the inflow openings 227 and flows out through back through discharge openings 226 of the housing 211.
  • the reverse flow direction is also possible.
  • the tool motors 112 and 212 each have a tool motor fan wheel 129 or 229 driven directly by themselves.
  • the tool motor fan wheel 129 and 229 travel in a manner known per se to the tool motor 112 or 212 when it is running.
  • the tool motor fan wheels 129 and 229 for example, rotatably connected to the motor shafts 22 of the tool motors 112 and 212, for example, arranged on or the motor shafts 22.
  • the handheld machine tool 110 or 210 when placing the handheld machine tool 110 or 210 into longer, power-intensive operation, it may overheat.
  • One could as a countermeasure e.g. provide many and / or large cooling fins. It is also possible that the performance of the tool motor of a normal hand machine tool is throttled so that overheating conditions do not occur.
  • the hand-held power tools 10, 110 and 210 have respective fan wheels 30, 130 and 230.
  • the fan wheels 130 and 230 are provided separately from and in addition to the tool-motor fan wheels 129 and 229.
  • the fan wheel 30 In the case of the manual power tool 10, only the fan wheel 30 is present, but no tool motor fan wheel which can be driven directly by the tool motor 12.
  • the operation of the fan wheels 30, 130 and 230 which are components of fan assemblies 50, 150 and 250, take over fan motors 31, 131 and 231.
  • the fan motors 31, 131 and 231 operate separately from the tool motors 12, 112 and 212, so can then drive their respective fan wheels 30, 130, and 230 when the tool motor 12, 112, and 212 is stationary, or perhaps at a different speed than the fan motors 31, 131, and 231.
  • the fan motor 31 includes an exciting coil assembly 32 for generating a rotating magnetic field.
  • the excitation coil arrangement 32 forms part of a primary part 33 of the fan motor 31.
  • a secondary part 34 of the fan motor 31 is provided by the fan wheel 30.
  • the fan 30, for example, a squirrel cage, which is driven by the excitation coil assembly 32.
  • the fan wheel may also include one or more magnets of a magnet assembly that cooperate with the excitation field that can be generated by the exciting coil assembly 32.
  • the fan 30 includes, for example, a Lüfterradnaben redesign 35, projecting from the wings 36. With the wings 36, which are designed in the manner of the ribs or projecting guide surfaces, the cooling air flow 28 can be generated in the manual power tool 10.
  • the fan wheels 130 and 230 have wings 136 or 236 in a similar manner.
  • the fan 30 is mounted by means of a bearing assembly 37 directly on or on the motor shaft 22 of the tool motor 12.
  • a bearing receptacle 38 for the components of the bearing assembly 37 is provided.
  • a bearing insert 39 for example, a socket or the like, was added.
  • the bearing insert 39 holds roller bearings, namely a needle bearing 40 and a ball bearing 41.
  • the needle bearing 40 could of course also be provided a sealing ring, a felt or other bearing and / or sealing component.
  • the needle bearing 40 is closer to the tool motor 12 than the ball bearing 41. Before the holding portion 42 is still radially inwardly an end-side projection 44, which is provided for holding the needle bearing 40 in the holding portion 43. For example, the two bearings 40 and 41 are pressed into the bearing insert 39, there glued or the like.
  • annular holding portion 42 for holding the needle bearing 40 and another, larger diameter holding portion 43 for the ball bearing 41 is provided. Between the holding portions 42 and 43 is a step.
  • the respective inner bearing rings 45 of the needle bearing 40 and the ball bearing 41 are rotatably mounted on the motor shaft 22.
  • the primary part 33 of the fan motor 31 comprises an exciter core 46, which is laminated, for example.
  • the excitation core 46 comprises an annular body 47, from which radially inward (radially outward would also be possible) coil support 48 protrude.
  • Coils 49 of the exciting coil arrangement 32 are arranged on the coil carrier 48.
  • the field coil assembly 32 is partially received in the fan 30, which allows a particularly compact design.
  • an annular receptacle 51 located on the fan 30, in particular the Lüfterradnaben redesign 35, an annular receptacle 51, in which an end face of the excitation coil assembly 32 partially engages.
  • the exciting field of the excitation coil arrangement 32 can act optimally on the secondary part 34 or the fan wheel 30.
  • the primary part 33 comprises a carrier 52 for the exciter core 46.
  • the carrier 52 comprises a plate 53, on which one or more holding projections 54, for example a ring body, for holding the exciting coil assembly 32 is provided.
  • the annular body 47 of the excitor core 46 is received in the annular body of the retaining projection 54.
  • the primary part 33 of the fan motor 31 is fixedly connected to the housing 11 of the hand-held power tool 10.
  • a receiving space 55 for receiving the fan 30 and the fan motor 31 is provided.
  • an outer periphery of the plate 53 is held on an inner circumference of the housing or the receiving space 55.
  • the front motor bearing 23 of the tool motor 12 is held by a bearing holder 61. At the bearing 23 opposite outer side of the bearing holder 61, the primary part 33 is still supported.
  • the bearing holder 61 includes, for example, a projection 62 protruding radially inward of the motor bearing 23, which holds the motor bearing 23 in a receptacle 63 of a front gear receiving portion 64 of the housing 11.
  • the fan assembly 50 is kept so compact that it can be provided instead of an otherwise directly driven by the tool motor 12 tool motor fan.
  • the fan assembly 50 is located between the motor bearing 23, which supports the motor shaft 22 on the housing 11, and the tool motor 12.
  • the fan 30 would be possible, for example by means of a fan motor 31 ', which could drive the fan 30 by means of a toothed gear, friction gear, belt drive or the like.
  • the fan motor 31 ' is not coaxial with the motor shaft 22 of the tool motor 12.
  • the fan motor 31' is accommodated in the section 65 of the housing 11.
  • the tool motor fan 129th Die Malawimotor-Lwerad 129 is rotatably connected to the motor shaft 22, so will directly driven by the tool motor 112.
  • a part of the cooling air flow 28 can already be generated by the tool motor fan wheel 129 when the tool motor 112 rotates.
  • the fan assembly 150 of the hand machine tool 110 still includes the impeller 130.
  • the impeller 130 is disposed in a rear portion 65 of the housing 111 and can generate the cooling air stream 28 alone or in cooperation with the tool motor 112.
  • a rear receiving space 156 is provided for the fan 130.
  • the cooling air flow 28 can flow through the inlet openings 27 located there.
  • the fan wheel 130 is driven by a fan motor 131 arranged coaxially with the tool motor 112.
  • the fan motor 131 is arranged close to the inlet openings 27, at least on the side remote from the tool motor 112 side of the fan wheel 130. This is an optional action.
  • this configuration facilitates the arrangement of a preferably additionally provided coupling 57, which is arranged on the rear, the fan wheel 130 facing end portion of the motor shaft 22.
  • the coupling 57 can produce a drive connection between the tool motor 112 and the fan wheel 130, that is, couple the fan wheel 130 to the tool motor 112 or decouple it from it.
  • the clutch 57 includes a centrifugal clutch that engages at a higher speed of the tool motor 112 so that the tool motor 112 drives the fan 130 and at lower or lower speed of the tool motor 112 disengages it from the fan 130, such that the fan 130 rotates freely, for example can or alone by the fan motor 131 can be driven.
  • the fan 130 is once driven by the fan motor 131, for example, at low speeds of the tool motor 112, another time only by the tool motor 112 or by the tool motor 112 together with the fan motor 131, eg at higher speeds of Tool motor 112.
  • the tool motor 212 drives the tool motor impeller 229 permanently.
  • the tool motor impeller 229 is disposed between a motor housing 222 and the transmission 218, for example.
  • the tool motor impeller 229 thus always runs at the same speed as the motor shaft of the tool motor 212, whereby, of course, a transmission could be provided, for example, to increase the speed of the tool motor impeller 229 against the rotational speed of the tool motor 212 or lower.
  • a transmission between the at least one dedicated fan wheel and the fan motor separate the fan motor and the fan may be provided, so that for example the fan motor with respect to the at least one fan larger or lower speed.
  • the separately driven by the fan motor 231 fan 230 is disposed on an outer circumference of the motor housing 222 or in a gap between the motor housing 222 and the Tool motor fan 229.
  • the fan motor 231 includes a primary part 33, which is arranged externally on the motor housing 222.
  • the primary part 33 comprises, for example, an exciter coil arrangement 232 in the manner of the excitation coil arrangement 32 of the primary part 33 of the fan motor 31.
  • the fan wheel 230 may also be driven by the fan motor 231 when the tool motor 212 is stationary.
  • the fan assembly 250 then generates the cooling air stream 28 such that the cooling air stream 28 flows over cooling fins of a cooling fin assembly 260 of the motor housing 222 and thus effectively cools the tool motor 212 even when it is at a standstill.
  • a controller 70 which may be part of each of the hand-held machine tools 10, 110 and 210, is an inventive working, optimized control for a fan assembly with a separate motor tool motor for driving a fan of the will be explained.
  • a passive control is possible, i. E. that, for example, at a pressure on the drive switch 16 each of the fan motor 31, 131 or 231 runs along, i. that the fan motor 31, 131 and 231 is energized in parallel with the tool motor 12, 112 and 212.
  • a controller can also be configured very simply, ie that the respective fan motor is still supplied with power, for example, using a storage capacitor or other energy storage, if the tool motor is already turned off, ie that the fan motor is still running and overheating the stationary Hand machine tool prevented.
  • an inertia of the fan motor and / or the fan may be configured so that the fan assembly lags after switching off the tool motor.
  • the controller 70 exemplifies some intelligence of a controller, i. It has, for example, a microprocessor 71, a memory 72 and an output stage 73, for example with power transistors, in order to drive the fan motors 31, 131 or 231.
  • a program 74 for controlling the fan motor 31, 131 or 231 is stored in the memory 72.
  • the program 74 contains, for example, program code that can be executed by the microprocessor 71 in order to control the respective fan motors.
  • the output stage 73 or other power electronics is expediently provided with a heat sink 59.
  • the heat sink 59 is disposed in the cooling air flow 28, i.
  • the cooling air generated by the fan wheel 130 flows around the heat sink 59 and thus cools the output stage or output stage 73.
  • the arrangement can be taken similarly low in the other hand-machine tools, which can be easily seen, for example, in the hand-machine tool 10.
  • the controller 70 is integrated into a housing of the drive switch 16, so that the non-illustrated heat sink 59 may be, for example, in the cooling air flow 28 before.
  • the controller 70 may be an integral controller that also controls the tool motor 12, 112, 212 or other components of the respective hand machine tool 10, 110 or 210.
  • the microprocessor 71 for example, not may be provided specifically for the fan assembly 50, 150 or 250 according to the invention, but may also take on other tasks.
  • a dedicated control associated with the fan arrangement is expedient.
  • a temperature sensor 75 is expediently arranged in the housings 11, 111 or 211.
  • the temperature sensor 75 is arranged, for example, in the region of the controller 70 so that it can detect a respective temperature of its relatively sensitive electronic components.
  • Another temperature sensor 76 is arranged, for example, on or in the tool motor 12, 112 or 212. The temperature sensor 76 serves to detect a temperature of the tool motor 12, 112 or 212.
  • Another sensor that interacts with the controller 70 is a speed sensor 77 that detects a respective speed of the tool motor 12, 112, or 212.
  • controller 70 also serves to control the tool motor 12, 12 or 212, which is preferred per se, it is possible, in particular if this tool motor is an electronically commutated or brushless DC motor, that the speed sensor 77 is not necessary because the controller 70 is already determined by other means, with which speed the tool motor 12, 112 or 212 rotates.
  • the controller 70 is shown as a block diagram in cooperation or to control the fan assembly 50:
  • a rotational speed NW of the tool motor 12 is substantially constant from a time t0 to a time t1, but then decreases to zero until a time t2 (FIG. FIG. 6 ).
  • the fan motor 31 runs from the beginning, that is, when the tool motor 12 is turned on at the time t0, with a likewise substantially constant speed NL.
  • the controller 70 does not switch off the fan motor 31 at the time t2 even though it knows the standstill of the tool motor 12 based on the speed sensor 77, but allows the fan motor 31 to continue to run for a follow-up time TN until a time t3, so that the machine is already stationary standing tool motor 12 is still in the cooling air flow 28 and is cooled.
  • the controller 70 preferably sets the respective rotational speed NL of the fan motor 31 as a function of a rotational speed of the tool motor 12, so that optimum cooling is ensured even at relatively high rotational speeds of the tool motor 12.
  • the controller 70 intervenes or regulates the rotational speed of the fan motor 31 as a function of the respective temperatures detected by the temperature sensor 75 and / or 76.
  • the temperature profile TA of the tool motor 12 and the rotational speed curve NL of the fan motor 31 in accordance with FIG. 7 illustrate that the controller 70 not only a speed-dependent, but also a temperature-dependent control of the fan motor 31, 131, 231 makes.
  • the temperature TA of the tool motor 12 increases almost to an upper limit value Tg at the time t0, it then drops again until a time t5 and then increases again.
  • the temperature TA of the tool motor 12 exceeds the limit value Tg.
  • the controller 70 controls the fan motor 31, which still runs at relatively low speed from the time t0, to increase the speed NL, so that the cooling power is increased. It can be seen that the temperature TA of the tool motor 12 decreases again relatively quickly after the rotational speed of the fan motor 31 has been increased and falls below the limit value Tg at a time t7 and returns to zero again by the time t9.
  • the controller 70 lowers the speed NL of the fan motor 31, and restores the same speed as the fan motor 31 had until time t6 from time t8.
  • a temperature peak of the tool motor 12 has been intercepted or avoided so to speak by the fan assembly 50, 150, 250 according to the invention.
  • the hand-held machine tool 10 is switched off at the time t5, that is, the tool motor 12 is no longer running. Due to the previous operation with, for example, a relatively high speed and / or with a relatively high torque, the tool motor 12 is highly heated. However, the fan assembly 50 also cools effectively in this case of operation and avoids that, for example, electrical coils or other sensitive components of the tool motor 12 overheat when it is taken out of service.
  • cooling by the tool motor impeller 129 may be sufficient by time t6, while the controller 70 additionally switches the fan motor 131 thereafter to avoid a temperature spike.
  • the temperature value TA stands by way of example for every other temperature value, for example a housing temperature value, which can be detected by the temperature sensor 75.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (15)

  1. Machine-outil manuelle (10; 110; 210), en particulier ponceuse, appareil de séparation ou visseuse, avec un moteur d'outil (12 ; 112 ; 212) pour l'entraînement motorisé d'un logement d'outil (13 ; 213) prévu pour le maintien d'un outil (14, 214), et avec une roue de ventilateur (30 ; 130 ; 230), disposée conjointement avec le moteur d'outil (12 ; 112 ; 212) dans un carter (11, 111, 211) de la machine-outil manuelle (10 ; 110 ; 210), d'un ensemble ventilateur (50 ; 150 ; 250) pour la génération d'un flux d'air de refroidissement (28) pour le refroidissement de la machine-outil manuelle (10 ; 110 ; 210), en particulier du moteur d'outil (12 ; 112 ; 212), dans laquelle elle présente un moteur de ventilateur (31 ; 131 ; 231) séparé du moteur d'outil (12 ; 112 ; 212) pour l'entraînement motorisé de la roue de ventilateur (30 ; 130 ; 230), caractérisée en ce que la roue de ventilateur (30 ; 130 ; 230) pouvant être entraînée par le moteur de ventilateur (31 ; 131 ; 231) et/ou le moteur de ventilateur (31 ; 131 ; 231) sont disposés en rotation au niveau de ou sur l'arbre moteur (22) du moteur d'outil (12 ; 112 ; 212) au moyen d'un ensemble palier.
  2. Machine-outil manuelle selon la revendication 1, caractérisée en ce que le moteur d'outil (12 ; 112 ; 212) et le moteur de ventilateur (31 ; 131 ; 231) présentent des vitesses de rotation nominales et/ou des vitesses de rotation maximales sensiblement différentes les unes des autres, par exemple du facteur 2 ou du facteur 3.
  3. Machine-outil manuelle selon la revendication 1 ou 2, caractérisée en ce que le moteur d'outil (12 ; 112 ; 212) et/ou le moteur de ventilateur (31 ; 131 ; 231) sont des moteurs électriques et/ou que l'ensemble ventilateur (50 ; 150 ; 250) est réalisé pour le refroidissement d'un corps de refroidissement (59) et/ou d'un ensemble de nervures de refroidissement (260).
  4. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce que la roue de ventilateur (30 ; 230) pouvant être entraînée par le moteur de ventilateur (31 ; 131 ; 231) et/ou le moteur de ventilateur (31 ; 131 ; 231) sont coaxiaux avec un arbre moteur (22) du moteur d'outil (12 ; 112 ; 212).
  5. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce que l'ensemble palier comprend de manière appropriée au moins un palier à roulement disposé entre l'arbre moteur (22) du moteur d'outil (12 ; 112 ; 212) et la roue de ventilateur (30 ; 130 ; 230) pouvant être entraînée par le moteur de ventilateur (31 ; 131 ; 231).
  6. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce que la roue de ventilateur (30 ; 230) pouvant être entraînée par le moteur de ventilateur (31 ; 131 ; 231) est disposée au niveau de ou dans ou sur un carter de moteur (222) du moteur d'outil (12 ; 112 ; 212).
  7. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce que la roue de ventilateur (30 ; 230) pouvant être entraînée par le moteur de ventilateur (31 ; 131 ; 231) et le moteur de ventilateur (31 ; 131 ; 231) forment une unité de construction d'un seul tenant.
  8. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une partie primaire du moteur de ventilateur (31 ; 131 ; 231) est fixe par rapport au carter (11, 111, 211) et la roue de ventilateur (30 ; 130 ; 230) forme ou présente une partie secondaire du moteur de ventilateur (31 ; 131 ; 231).
  9. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce que la roue de ventilateur (30 ; 230) forme un rotor en court-circuit du moteur de ventilateur (31 ; 131 ; 231) et/ou présente un ensemble bobine et/ou un ensemble aimant.
  10. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un accouplement (57) est présent, avec lequel la roue de ventilateur (30 ; 230) pouvant être entraînée par le moteur de ventilateur (31 ; 131 ; 231) peut être accouplée avec le moteur d'outil (12 ; 112 ; 212) pour l'entraînement par le moteur d'outil (12 ; 112 ; 212).
  11. Machine-outil manuelle selon la revendication 10, caractérisée en ce que l'accouplement (57) accouple le moteur d'outil (12 ; 112 ; 212) avec la roue de ventilateur (30 ; 230) pouvant être entraînée par le moteur de ventilateur (31 ; 131 ; 231) en fonction d'une vitesse de rotation du moteur d'outil (12 ; 112 ; 212).
  12. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce que l'ensemble ventilateur (50 ; 150 ; 250) présente une roue de ventilateur de moteur d'outil (129 ; 229) entraînée ou pouvant être entraînée par le moteur d'outil (12 ; 112 ; 212).
  13. Machine-outil manuelle selon la revendication 12, caractérisée en ce que la roue de ventilateur de moteur d'outil (129 ; 229) est couplée fixement avec un arbre moteur (22) du moteur d'outil (12 ; 112 ; 212) ou est disposée au niveau de l'arbre moteur (22).
  14. Machine-outil manuelle selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle présente une commande (70) et/ou régulation pour la commande ou régulation du moteur de ventilateur (31 ; 131 ; 231) à l'aide d'au moins un paramètre dépendant en particulier du moteur d'outil (12 ; 112 ; 212) et/ou pour la commande du moteur de ventilateur (31 ; 131 ; 231) pour un temps d'inertie (TN) après une mise hors circuit du moteur d'outil (12 ; 112 ; 212).
  15. Machine-outil manuelle selon la revendication 14, caractérisée en ce que l'au moins un paramètre comprend une valeur de température de carter dans le carter (11, 111, 211) de la machine-outil manuelle (10 ; 110 ; 210) et/ou une valeur de température de moteur d'outil (TA) du moteur d'outil (12 ; 112 ; 212) et/ou une valeur de vitesse de rotation (NW) du moteur d'outil (12 ; 112 ; 212).
EP13005911.6A 2013-01-11 2013-12-18 Machine-outil manuelle dotée d'un ventilateur Active EP2754535B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013000374.1A DE102013000374A1 (de) 2013-01-11 2013-01-11 Hand-Werkzeugmaschine mit einem Lüfterrad

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EP2754535A2 EP2754535A2 (fr) 2014-07-16
EP2754535A3 EP2754535A3 (fr) 2018-02-14
EP2754535B1 true EP2754535B1 (fr) 2019-10-23

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DE102014215361A1 (de) * 2014-08-05 2016-02-11 Robert Bosch Gmbh Werkzeug mit steuerbarer Kühleinrichtung
DE102015104905A1 (de) 2015-03-30 2016-10-06 Festool Gmbh Hand-Werkzeugmaschine mit einer Lüfteranordnung
DE102015217058A1 (de) * 2015-09-07 2017-03-09 Robert Bosch Gmbh Handwerkzeugmaschinenvorrichtung
CN109314440B (zh) 2016-06-17 2022-04-12 阿特拉斯·科普柯工业技术公司 用于动力工具的冷却装置和方法
WO2018208235A1 (fr) * 2017-05-12 2018-11-15 Petrovic Janez Dispositif de dépoussiérage pour le dépoussiérage de l'air de refroidissement d'outils électriques
DE102017209160A1 (de) * 2017-05-31 2018-12-06 Robert Bosch Gmbh Handwerkzeugmaschinenvorrichtung
DE102017214600A1 (de) * 2017-08-22 2019-02-28 Robert Bosch Gmbh Verfahren zum Betrieb einer Kühlvorrichtung einer Handwerkzeugmaschinenvorrichtung

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DE102013000374A1 (de) 2014-07-17
EP2754535A2 (fr) 2014-07-16

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