EP4255671B1 - Machine-outil pourvu de refroidissement à air et procédé de refroidissement des composants d'une machine-outil - Google Patents

Machine-outil pourvu de refroidissement à air et procédé de refroidissement des composants d'une machine-outil

Info

Publication number
EP4255671B1
EP4255671B1 EP21814765.0A EP21814765A EP4255671B1 EP 4255671 B1 EP4255671 B1 EP 4255671B1 EP 21814765 A EP21814765 A EP 21814765A EP 4255671 B1 EP4255671 B1 EP 4255671B1
Authority
EP
European Patent Office
Prior art keywords
machine tool
power tool
motor
components
cooling
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
EP21814765.0A
Other languages
German (de)
English (en)
Other versions
EP4255671A1 (fr
EP4255671C0 (fr
Inventor
Ralf Greitmann
Roland Meuer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP4255671A1 publication Critical patent/EP4255671A1/fr
Application granted granted Critical
Publication of EP4255671B1 publication Critical patent/EP4255671B1/fr
Publication of EP4255671C0 publication Critical patent/EP4255671C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor

Definitions

  • the present invention relates to a machine tool with air cooling.
  • a special airflow system is proposed with which the components of the machine tool, such as the motor, gearbox, or electronics, can be cooled particularly efficiently by a flow of cooling air.
  • the cooling is intended to be independent of any components of the machine tool housing, since the airflow is advantageously achieved by internal control processes, which preferably operate independently of any components of the machine tool housing.
  • the housing-independent air cooling of the machine tool components is achieved in particular by providing a fan on a rotor of the machine tool motor, which is configured to generate a cooling airflow by means of a vacuum and guide it through the machine tool in a suitable manner.
  • the invention relates to a method for cooling components of a machine tool.
  • angle grinders or cut-off grinders are well-known, used to make cuts in a substrate or to machine the surface of a substrate.
  • Such angle grinders or cut-off grinders typically have a disc-shaped tool called a cutting or grinding wheel.
  • battery-powered cut-off saws with cutting discs and blade diameters greater than 230 mm are being introduced to the market, particularly for applications where gasoline-powered cut-off saws were previously used.
  • such devices are preferably referred to as "battery-powered cut-off saws” or “angle grinders.” These power tools are usually cooled by an airflow.
  • components such as the motor, electronics, gearbox, or tooling are cooled by airflow.
  • Components of the housing are typically used for air distribution. In existing machines, air distribution and cooling are therefore often integrated into housing parts. However, these housing parts also serve other purposes, such as robustness, appearance, ergonomics, and protection for the user and the machine's internal components. Often, compromises are made between function, construction, and design in the design of these housing parts, resulting in machine tools being offered with suboptimal air distribution and cooling.
  • a further objective of the present invention is to provide a machine tool and a cooling method for components within a machine tool that effectively prevents the ingress of particles into the machine tool via the air cooling system.
  • the internal components of the machine tool such as electronics, connectors, or the motor, should be protected as effectively as possible from dust, sludge, and other particles.
  • the invention relates in particular to an air-cooled battery-powered cut-off grinder with a brushless motor.
  • a fundamental concept underlying the invention is the provision of a special airflow system within the machine tool, enabling particularly effective and efficient cooling of the machine tool's components.
  • the airflow is generated, in particular, by a fan, which is preferably driven by a rotor shaft of the machine tool's motor.
  • the invention proposes a special airflow system within a machine tool, enabling the machine tool components, such as the motor, gearbox, or electronics, to be cooled with a particularly efficient flow of cooling air.
  • This cooling is designed to be independent of any components of the machine tool housing, as the airflow is advantageously controlled by internal steering processes. These internal steering processes preferably operate independently of any components of the machine tool housing.
  • This housing-independent air cooling of the machine tool components is achieved, in particular, by providing a fan on a rotor of the machine tool motor. This fan is configured to generate a cooling airflow using a vacuum and to guide it appropriately through the machine tool. It is preferred, according to the invention, that the air cooling of the machine tool be independent of any components of the machine tool housing. This allows for a particularly simple and robust design of the main body of the machine tool.
  • the airflow generated by the fan cools the components of the machine tool in the order a) to d) of their appearance above.
  • the invention relates to a machine tool with an air cooling device, wherein the machine tool has a fan for cooling components of the machine tool.
  • the machine tool comprises a carrier unit for electronics and battery interfaces, a motor connector, a motor with a stator and a rotor, and a motor housing as components, wherein the fan is arranged on the rotor of the motor and is configured to generate a negative pressure such that an airflow generated by the negative pressure cools the components of the machine tool in the order listed.
  • the fan is configured to generate an airflow such that the components of the machine tool are cooled in the order a) to d).
  • the motor connector preferably includes a cutting arm and a gearbox of the machine tool.
  • Cooling the components in this sequence is advantageous because the airflow first cools the component with the greatest cooling requirement, namely the electronics. The airflow then cools the motor and, when expelled, passes by the gearbox housing. For the function and service life of the machine tool, it is beneficial if any particles can first be deposited on the preferably passively designed cooling elements of the electronics before they reach the rotating rotor and cause bearing damage, rotor seizure, or similar issues.
  • the motor of the machine tool is a brushless motor.
  • a brushless motor is advantageously used because of its high efficiency and its long service life, which brushless motors exhibit due to contactless commutation.
  • the motor connector causes a deflection of the airflow by approximately 90 degrees.
  • approximately 90 degrees is not an unclear term for those skilled in the art, because they know that the phrase “approximately 90 degrees” or “essentially 90 degrees” refers to a substantially right angle, which—for example, due to manufacturing processes—may deviate from exact mathematical perpendicularity by 1 to 5 degrees.
  • the motor connector is designed to connect the electronics of the machine tool to the stator of the motor via contact points and wires. It is preferred, according to the invention, that the electronics control the motor during operation. For this purpose, a defined Current flow to the stator is used.
  • the electronics are designed to control the motor's commutation and, in particular, the rotor drive.
  • the housing of the motor connector serves internally as an air guide, deflecting the cooling airflow by approximately 90 degrees, and externally as a cable guide for the lines connecting the motor to the electronics.
  • These are preferably also referred to as "motor lines" within the meaning of the invention.
  • the motor lines are preferably configured to transmit data and/or control commands from the electronics to the motor.
  • the machine tool has two accumulators as a power source.
  • These accumulators (“batteries") can each be arranged in a receiving compartment in a rear, lower section of the main body of the machine tool.
  • the machine tool can comprise a rear section, which is formed, for example, by a main body and a protective frame.
  • the main body of the machine tool can be enclosed by a housing and include a control unit, a drive or drive train, and/or a motor.
  • the protective frame can include a front, circumferential handle and a second, upper handle.
  • the front part of the machine tool is formed by its tool, which, particularly if the machine tool is designed as an angle grinder, is a disc-shaped tool. It can be specifically referred to as a cutting disc. It is preferred, according to the invention, that the spatial directions "front” and “back” are defined by the front region of the machine tool formed by the tool and by the rear region of the machine tool formed, among other things, by the main body.
  • top and bottom are preferably defined by the upper handle (“top”), which, according to the invention, is also preferably referred to as the second handle, and by the protective frame, the underside of which preferably runs along the underside of the machine tool.
  • the machine tool comprises a first, circumferential handle, a second, upper handle, and a protective frame to protect the main body of the machine tool. Details of these components of the machine tool The details can be seen in particular in the figures.
  • the first, circumferential handle preferably extends in the area of the transition between the front and rear sections of the machine tool and is typically gripped by the left hand of a right-handed person. Therefore, the first circumferential handle can also be used for transporting the machine tool. Due to its circumferential design, the first handle provides effective impact protection on the sides of the machine tool, especially if the machine tool were to land on its right or left side if dropped.
  • the circumferential design of the first handle protects, in particular, the components of the machine tool located in the main body, such as the motor, drive, or gearbox, but also the accumulators. It is preferred, according to the invention, that the plane in which the first handle predominantly runs is essentially orthogonal to a longitudinal axis of the machine tool.
  • the longitudinal axis which can be conceptually placed through the machine tool, runs, in particular, centrally through the device and extends from the front section of the machine tool towards its rear section. In accordance with the invention, it is preferred that the plane in which the first handle predominantly runs is essentially perpendicular to the longitudinal axis of the machine tool.
  • the second, upper handle preferably runs substantially parallel to the virtual longitudinal axis of the machine tool and is typically gripped by the right hand of a right-handed person. According to the invention, it is preferred that the upper handle projects beyond the main body of the machine tool in a rearward direction, so that the main body and its internal components are well protected against the machine tool being dropped and landing on its rear side.
  • the term "projection" preferably describes the distance between a substantially vertical rear wall of the main body of the machine tool and the furthest point on the rear of the upper handle. This distance or projection is, for example, in the range of 1 to 12 cm, preferably 3 to 9 cm, and particularly preferably approximately 6 cm.
  • the second handle is arranged above the electronics of the machine tool and includes operating switches for the machine tool on its upper and/or lower surface. Since the second handle of the machine tool is usually gripped by the user's right hand, the machine tool can be operated particularly well by providing the operating switches on the upper and/or lower surface of the second handle. The preferred spatial proximity between the electronics of the machine tool and the at least one Operating switches in the second handle can significantly shorten transmission paths for control commands and simplify the wiring or circuitry within the device.
  • a carrier unit of the machine tool has at least one interface for a battery.
  • the batteries include contacts with which they can be plugged into the machine tool.
  • the machine tool includes a corresponding connection arrangement with which the contacts of the batteries can interact.
  • the machine tool includes an interface with which the power supply to the device or the energy output of the batteries can be controlled.
  • the machine tool includes one interface that controls the energy output of both batteries.
  • the machine tool includes two interfaces, i.e., one interface for each battery.
  • the batteries can be connected to the electronics of the machine tool via an interface and contacts. In other words, it may be preferred, according to the invention, that the batteries can be connected to the electronics of the machine tool via an interface and contacts.
  • the carrier unit can include electronics for the machine tool.
  • the machine tool's electronics can include a control unit for controlling the machine tool's operation. It is preferred, according to the invention, that the machine tool's electronics incorporate heat sinks.
  • the electronics can be installed in a suspended position within the machine tool.
  • the electronics are installed suspended within the machine tool or its main body.
  • This preferably suspended installation of the electronics within the machine tool advantageously prevents the formation of deposits of protective particles, dust particles, or sludge.
  • the installation of the electronics in the carrier unit is designed so that only the heat sink comes into contact with the airflow. This ensures optimal cooling of the electronics and prevents deposits from forming on contacts such as connectors or similar components.
  • the electronics are installed rotated by 180° within the machine tool, with the electronic housing facing upwards.
  • the machine tool has air inlets for drawing in air, wherein the air inlets are arranged on a rear side of a main body of the machine tool.
  • the position of the air inlets is particularly advantageous in Fig. 1
  • the air inlets can be considered components of the carrier unit, with air being drawn into the carrier unit above the accumulators. This drawing-in is primarily caused by the negative pressure generated by the fan, which is located in the area of the rotor of the machine tool's motor.
  • air is not unclear to those skilled in the art, as it refers to the gaseous oxygen-nitrogen mixture that essentially constitutes the Earth's atmosphere.
  • a stream of such air is drawn in from the vicinity of the machine tool through the air inlets and used to cool the components inside the machine tool or its main body.
  • the machine tool comprises a first air inlet arranged above a first accumulator, and a second air inlet arranged above a second accumulator.
  • the air inlets are located on opposite sides of the second handle of the machine tool.
  • the air inlets can be located on a right and a left side of the second handle of the machine tool.
  • This preferred bilateral arrangement of the at least two air inlets with respect to the second handle on the rear of the machine tool is also in Fig. 1 depicted.
  • domes are provided in the area of the air inlet to protect the air inlets from the ingress of larger dust particles.
  • the provision of the domes allows the internal components of the machine tool to be particularly well protected against such particles that enter the interior of the machine tool or its main body with the incoming airflow through the air inlet.
  • the domes are preferably designed to block the passage of larger particles through the air inlets, thus preventing them from entering the interior of the machine tool or its main body in the first place.
  • the air inlets are located as far away as possible from the working area of the machine tool. Tests have shown that it is a significant advantage of the invention that the air inlets are arranged as far away as possible from the location where the working or cutting process of the machine tool takes place. The location where the working or cutting process of the machine tool takes place, In the context of the invention, this is preferably also referred to as the working area of the machine tool.
  • the machine tool has an air outlet located in the area of a gearbox of the machine tool.
  • the air outlet in close proximity to the gearbox of the machine tool, cooling of the gearbox can also be advantageously provided.
  • cooling of the gearbox by the outgoing air, which has previously cooled the components of the machine tool is made possible.
  • the at least one air outlet is designed as a lateral air outlet and is located on a right or left side of the machine tool.
  • the at least one air outlet is located on the side of the machine tool where the cutting arm of the machine tool is located.
  • the cutting arm is preferably part of the motor housing, from which it extends in the direction of the preferably disc-shaped tool of the machine tool.
  • the air outlet is preferably not located on the side of the machine tool where the user stands while operating the machine. This ensures that the airflow from the machine tool is not directed towards the user, thus preventing unpleasant drafts.
  • the airflow from the machine tool is also not directed towards the working area of the machine tool. This prevents dust from being stirred up during operation of the machine tool, which could then enter the user's respiratory tract. It is preferred according to the invention that the cooling of the machine tool's gearbox can be achieved by the outflowing air.
  • the arrangement of the at least one air outlet prevents the outflowing air from being blown into a working area of the machine tool. This effectively prevents additional dust turbulence.
  • the motor rotor has an encapsulation for dust protection.
  • the encapsulation provides particularly good protection against dust for the rotor and thus for the moving part of the motor, thereby significantly extending its service life, as tests have shown.
  • the encapsulation of the rotor allows for a preferably hermetic separation of the rotor, so that dust ingress towards the rotating components of the rotor is particularly effectively prevented.
  • a central support preferably also referred to as a support unit
  • This support unit is preferably made of plastic or comprises one or more plastics. This allows the support unit to be very stable on the one hand and particularly lightweight on the other, so that it contributes only negligibly to the overall weight of the machine tool.
  • the support unit is rigidly connected to the motor housing and is configured to accommodate the electronics, interfaces, contacts, accumulators, and/or damping elements.
  • the support provides an internal structure for the main body of the machine tool, wherein the machine tool components located within the main body can be attached to the support unit.
  • the protective frame and the upper handle can also be attached to the support unit.
  • the housing of the machine tool can preferably consist of two housing shells, which can also be mounted on the support unit.
  • the support together with the motor housing, forms a central component for the cooling airflow.
  • the electronics of the machine tool are suspended within or on the support unit to effectively prevent the accumulation of dust and/or water.
  • the support unit can include a heat sink for cooling the electronics, and an airflow can be directed through the support for cooling the electronics.
  • the support unit is inclined backwards at an angle of inclination greater than 3 degrees, preferably greater than 5 degrees. It is preferred, according to the invention, that the angle of inclination preferably forms between an imaginary ground plane on which the machine tool can be placed and a plane that runs centrally through the support unit of the machine tool.
  • the interfaces and contacts for connecting the machine tool to the accumulators are essentially horizontal.
  • the batteries within the machine tool are also oriented substantially horizontally.
  • substantially horizontal preferably means that the components in question are not inclined within the machine tool, i.e., that any straight line or plane passing through them forms an angle of substantially 0 degrees with an imaginary base plane. In other words, an imaginary straight line or plane passes through the Interfaces, contact surfaces and/or accumulators essentially parallel to an imaginary subsurface plane.
  • the accumulators include contacts with which they can be plugged into the machine tool.
  • the machine tool includes a corresponding connection arrangement with which the contacts of the accumulators can interact.
  • the machine tool includes an interface with which the power supply to the device or the energy output of the accumulators can be controlled.
  • the machine tool includes one interface that controls the energy output of both accumulators.
  • the machine tool includes two interfaces, i.e., one interface for each accumulator.
  • the accumulators can be connected to the electronics of the machine tool via an interface and contacts.
  • a machine tool is provided with a fan and the aforementioned components, namely at least one carrier unit, a motor connector, a motor, and a motor housing.
  • the motor of the machine tool is preferably a brushless electric motor comprising a rotor as a moving part and a stator as a stationary part.
  • the fan of the machine tool is connected to The fan is arranged in front of the motor rotor and is designed to generate a negative pressure, which preferably causes an airflow within the machine tool. This airflow, generated by the fan, is used in the context of the invention to cool the machine tool components, in particular by directing it past the machine tool components.
  • the cooling of the machine tool components is carried out in the sequence i) to iv), i.e., preferably in the sequence specified in the description of the method. It is particularly preferred, according to the invention, that the machine tool components are cooled in the sequence i) to iv), preferably by a cooling airflow that can be generated by a negative pressure. This negative pressure is preferably generated by a fan arranged on the rotor of the machine tool motor.
  • the cooling airflow enables device cooling that is advantageously independent of parts of the machine tool housing. In particular, the airflow within the machine tool is not guided by housing parts of the machine tool, but rather by the carrier unit containing the electronics, the motor connector, the motor, and the motor housing with an integrated gearbox.
  • the airflow and/or device cooling is advantageously independent of the housing components.
  • the machine tool, its air cooling device, or the support unit can have air inlets designed to draw in air, the drawn-in air forming an airflow for cooling the machine tool components.
  • the air inlets are arranged on the rear side of a main body of the machine tool.
  • the machine tool comprises a first air inlet arranged above a first accumulator, and a second air inlet arranged above a second accumulator.
  • the air inlets are located on the right and left sides of the second handle of the machine tool.
  • the air inlets on the support unit can have domes to protect them from the ingress of protective and/or dust particles.
  • the machine tool can also have an air outlet located in the area of a gearbox.
  • the electronics, which are preferably arranged on the support unit can have heat sinks and are preferably mounted in a suspended position. This helps to prevent the accumulation of particles or sludge.
  • Figure 1 shows in an upper area a side view of a preferred embodiment of the proposed machine tool 1 and in a lower area a rear view of a preferred embodiment of the proposed machine tool 1.
  • Figure 1 shows Fig 1
  • the rear section of the machine tool 1 is formed by a main body 4, which is surrounded by a first, circumferential handle 12, a second handle 13 for carrying the machine tool 1, and a protective frame 14.
  • the protective frame 14 may have two lateral L-shaped structures 16, which are connected to each other via connecting webs (not shown).
  • Actuating switches 21 and locking mechanisms 30 may be provided on the upper handle 13.
  • the second handle 13 forms a projection 17, i.e., has a section that extends beyond the rear 9 of the main body 4 of the machine tool 1.
  • the main body 4 of the machine tool 1 may be enclosed by a housing 6.
  • the machine tool has a motor 5, which is enclosed by a separate motor housing 22.
  • Air inlets 29 are provided on the rear side 9 of the main body 4 of the machine tool 1. These are openings through which air can be drawn into the interior of the machine tool 1.
  • the drawn-in air, or the airflow 35 generated by the intake is used to cool various components of the machine tool 1, in particular to cool a carrier unit 32, which contains or is designed to house electronics 20 of the machine tool 1.
  • the airflow 35 cools a motor connector 34, the motor 5, and the motor housing 22 of the machine tool 1.
  • the motor 5 is preferably a brushless electric motor comprising a rotor 37 and a stator 38.
  • a fan 40 is located in the area of the rotor 37 of the motor 5, which draws in air through the air inlets 29a and 29b, thus generating the airflow 35.
  • the machine tool 1 preferably has two accumulators 2, 3 as its energy source, above which the air inlets 29a, 29b are arranged.
  • the accumulators 2, 3 are located in a first receiving chamber 7 and a second receiving chamber 8 within the main body 4 of the machine tool 1.
  • the accumulators 2, 3 are connected to the machine tool 1 and the electronics 20 of the machine tool 1, respectively, via contacts 19 and interfaces 18.
  • One possible arrangement of the contacts 19 and interfaces 18 is shown in Fig. 2 shown.
  • a charge level indicator 31 which is located on the back 9 is located on the machine tool 1 and can be used to display the charge level of the accumulators 2, 3.
  • FIG. 2 Figure 1 shows a side view of a preferred embodiment of the proposed machine tool 1 without accumulators 2, 3.
  • the electronics 20 of the machine tool 1 are arranged above the interface 18 and above the contacts 19 for the accumulators 2, 3. Furthermore, the electronics 20 are located in close proximity to the accumulators 2, 3 to minimize transmission and communication paths.
  • Figure 1 shows... Fig. 2
  • the motor 5 of the machine tool 1 is shown, which is arranged in a front region of the main body 4 of the machine tool 1.
  • the motor 5 has an axis that is essentially orthogonal to a longitudinal axis of the machine tool 1 running centrally within the machine tool 1. In other words, the axis of the motor 5 of the machine tool 1 is preferably perpendicular to the longitudinal axis of the machine tool 1.
  • the electronics 20 of the machine tool 1 are preferably housed in a carrier unit 32, which has an inclination angle of 3 to 5 degrees.
  • the accumulators 2, 3 are arranged at an angle within the machine tool 1.
  • the carrier unit 32 can preferably also include the contacts 19 and interfaces 18, thus establishing the connection between the accumulators 2, 3 and the machine tool 1.
  • the carrier unit 32 has cooling elements 36, over which the airflow 35 passes to cool the machine tool components. These cooling elements 36 of the carrier unit 32 are particularly well integrated into Fig. 4 depicted.
  • the air outlet 33 allows the used air, which is used for cooling the components of the machine tool 1, to be expelled.
  • the air outlet 33 is formed, in particular, by ventilation slots, which may be located in the area of a gearbox 23 of the machine tool 1. The arrangement of the air outlet 33 prevents unwanted dust from being stirred up, as the air outlet 33 is positioned away from a working area of the machine tool 1.
  • FIG. 3 Figure 1 shows a view of a preferred embodiment of an internal functional unit of components of the proposed machine tool 1 with an indicated airflow 35 for cooling the components of the machine tool 1.
  • Figure 2 shows Fig. 3 the cutting arm 24 of the machine tool 1, as well as a preferably independently functioning unit consisting of motor 5, electronics 20, gearbox 23, interfaces 18 and contacts 19.
  • the electronics 20 of the machine tool 1 are mounted in a suspended position.
  • the motor connector 34 is located in the area of the motor 5 of the machine tool 1, with wires connecting the motor connector 34 to the electronics 20.
  • the accumulators 2 and 3 are in Fig. 3
  • the inner functional unit is not shown for better illustration.
  • Fig. 3 a possible path of the cooling airflow 35 through the machine tool 1. It is preferred, according to the invention, that the airflow 35 first flows through and cools the carrier unit 32 with the electronics 20, then the motor connector 34, then the motor 5 and subsequently the motor housing 22.
  • the drawn-in air forming the airflow 35, is drawn in through the air inlets 29a and 29b and discharged back into the environment of the machine tool 1 through the air outlet 33.
  • the airflow 35 which is used to cool the machine tool components, is generated by a negative pressure, which in turn is created by a fan 40.
  • the fan 40 is located in the area of the rotor 37 of the motor 5 of the machine tool 1, as shown in particular in Fig. 5 It is shown.
  • the motor 5 is surrounded by a separate motor housing 22, so that the proposed machine tool 1 essentially comprises two housings, namely the housing 22 of the motor 5, and the housing 6 of the main body 4 of the machine tool 1.
  • Fig. 3 This allows a view of the underside of the carrier unit 32, which includes the contacts 19 and interfaces 18 for connecting the machine tool 1 to the accumulators 2, 3.
  • the accumulators 2, 3 are each arranged in a receiving space 7, 8, with each accumulator 2, 3 or each receiving space 7, 8 being assigned a contact area 19 and an interface area 18 for connecting one accumulator 2, 3 to the machine tool 1.
  • Fig. 4 Figure 1 shows a further view of a preferred embodiment of the internal functional unit of the components of the proposed machine tool 1.
  • the airflow 35 for component cooling, or rather its path through the machine tool 1 is shown.
  • the airflow 35 is drawn into the machine tool 1 through the air inlets 29a and 29b.
  • the air inlets 29a and 29b are located, in particular, between the carrier unit 32 and the electronics 20 of the machine tool 1. This is clearly visible in Fig. 4 the inclination of the support unit 32.
  • the cutting arm 24 of the machine tool 1 and the drive means 26, which transmits the movement of the motor 5 of the machine tool 1 to the tool 25, are shown.
  • the gearbox 23 and the drive means 26 — here a belt – are preferably arranged in the preferably separate motor housing 22 of the machine tool 1.
  • Figure 1 shows a section through the carrier unit 32 and a section through the heat sinks 36 of the electronics 20. Air is drawn in through the air inlets 29a, 29b and forms a cooling airflow 35, which flows through the heat sinks 36 of the electronics 20 of the machine tool 1 and thus cools the electronics 20. The airflow 35 is guided by internal processes from the carrier 32 and the heat sinks 36 to the area of the motor connector 34 and further into the motor 5 to cool it.
  • FIG. 5 Figure 1 shows a sectional view through a preferred embodiment of gearbox 23 and motor 5 of the proposed machine tool 1.
  • Figure 2 Fig. 5
  • the cooling airflow 35 which cools the components of the machine tool 1, is also shown.
  • the airflow 35 is directed outside the stator 38 to the fan 40. From there, it is guided past the motor housing 22 and the gearbox 23 towards the air outlet 33, where the used air is blown out of the machine tool 1.
  • the airflow 35 enters the Fig. 5
  • the unit shown, consisting of motor 5 and gearbox 23, is connected via the motor connector 34.
  • the motor 5 has, in a manner known per se, a rotor 37 and a stator 38, which are arranged as shown in Fig. 5 They can be arranged as shown.
  • An encapsulation 39 of the rotor 37 of the motor 5 of the machine tool is shown.
  • the encapsulation 39 can be formed by or include a seal.
  • the encapsulation 39 protects the rotor 37, in particular from dust and moisture.
  • the encapsulation 39 also seals the rotor 37 against the airflow 35. This advantageously increases the service life of the bearings of the rotor 37.
  • the airflow 35 flows past the outside of the stator 38 and thus cools the stator 38.
  • the airflow 35 is then expelled at the motor housing 22 next to the gearbox 23 of the machine tool 1.
  • FIG. 6 Figure 1 shows a view of the underside of a preferred embodiment of the proposed machine tool 1.
  • the motor 5 is arranged in a front region of the main body 4 of the machine tool 1. It is surrounded by a motor housing 22.
  • the motion generated by the motor 5 of the machine tool 1 is transmitted to the drive means 26 via the The tool 25 of the machine tool 1 transmits the power.
  • a gearbox 23 of the machine tool is arranged between the drive means 26 and the motor 5, preferably also located within the motor housing 22.
  • the drive means 26 can comprise or be formed by a belt.
  • the cutting disc 25 of the cut-off grinder 1 is connected to the main body 4 of the cut-off grinder 1 via a cutting arm 24, the belt for transmitting the movement of the motor 5 of the cut-off grinder running at least partially parallel to the cutting arm 24.
  • the accumulators 2, 3 are in Fig. 6 not shown. By omitting them, the battery interface 18 and the connection contacts 19, which electrically and electronically connect the batteries 2 and 3 to the machine tool, can be seen.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Battery Mounting, Suspending (AREA)
  • Portable Power Tools In General (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (13)

  1. Machine-outil (1) ayant un refroidissement par air destiné à refroidir des composants (32, 20, 34, 5, 38, 22) de la machine-outil (1), comprenant
    un ventilateur (40) destiné à refroidir des composants (32, 20, 34, 5, 38, 22) de la machine-outil (1), la machine-outil (1) comprenant en tant que composants
    a) une unité de support (32) comportant une électronique (20) de commutation d'un moteur sans balais (5),
    b) un connecteur de moteur (34),
    b) le moteur sans balais (5) doté d'un stator (38) et d'un rotor (37) et
    d) un carter de moteur (22),
    caractérisé en ce que le ventilateur (40) est disposé sur le rotor (37) du moteur (5) et est conçu pour générer une dépression de telle sorte qu'un flux d'air (35) généré par la dépression provoque un refroidissement des composants (32, 38, 34, 5, 20, 22) de la machine-outil (1), caractérisée en ce que
    le flux d'air (35) refroidit les composants (32, 20, 34, 5, 38, 22) de la machine-outil (1) dans l'ordre a) à d).
  2. Machine-outil (1) selon la revendication 1,
    caractérisée en ce que
    l'unité de support (32) comporte une électronique (20) et au moins une interface (18) pour un accumulateur (2, 3).
  3. Machine-outil (1) selon la revendication 2,
    caractérisée en ce que
    l'électronique (20) comporte au moins un dissipateur thermique (36).
  4. Machine-outil (1) selon la revendication 3,
    caractérisée en ce que
    l'électronique (20) peut être montée suspendue à l'intérieur de la machine-outil (1).
  5. Machine-outil (1) selon l'une des revendications précédentes,
    caractérisée en ce que
    la machine-outil (1) comporte deux accumulateurs (2, 3) comme source d'énergie.
  6. Machine-outil (1) selon l'une des revendications précédentes,
    caractérisée en ce que
    la machine-outil (1) comprend une première poignée circonférentielle (12), une seconde poignée supérieure (13) et un cadre de protection (14) destiné à protéger le corps principal (4) de la machine-outil (1).
  7. Machine-outil (1) selon l'une des revendications précédentes,
    caractérisée en ce que
    la machine-outil (1) comporte des entrées d'air (29) pour l'admission d'air, les entrées d'air (29) étant disposées sur un côté arrière (9) d'un corps principal (4) de la machine-outil (1).
  8. Machine-outil (1) selon l'une des revendications précédentes,
    caractérisée en ce que
    la machine-outil (1) comprend une première entrée d'air (29a) disposée au-dessus d'un premier accumulateur (2) et une seconde entrée d'air (29b) disposée au-dessus d'un second accumulateur (3).
  9. Machine-outil (1) selon l'une des revendications 7 ou 8, toutes deux dépendantes de la revendication 6,
    caractérisée en ce que
    les entrées d'air (29, 29a, 29b) sont situées sur différents côtés de la seconde poignée (13) de la machine-outil (1).
  10. Machine-outil (1) selon l'une des revendications 7 à 9,
    caractérisée en ce que
    les entrées d'air (29, 29a, 29b) comportent des dômes (11) destinés à protéger les entrées d'air (29a, 29b) contre la pénétration de particules de protection et/ou de poussière.
  11. Machine-outil (1) selon l'une des revendications précédentes,

    caractérisée en ce que
    la machine-outil (1) comporte une sortie d'air (33) disposée dans la zone d'un engrenage (23) de la machine-outil (1).
  12. Machine-outil (1) selon l'une des revendications précédentes,
    caractérisée en ce que
    le rotor (37) du moteur (5) comporte une encapsulation (39) destinée à la protection contre la poussière.
  13. Procédé destiné à refroidir des composants (32, 20, 34, 5, 38, 22) d'une machine-outil (1) selon l'une des revendications précédentes,
    caractérisé par les étapes de procédé suivantes :
    a) munir la machine-outil (1) d'un ventilateur (40), la machine-outil (1) comprenant en tant que composants (32, 20, 34, 5, 38, 22)
    i) une unité de support (32)
    ii) un connecteur de moteur (34),
    iii) un moteur (5) doté d'un stator (38) et d'un rotor (37) et
    iv) un carter de moteur (22),
    le ventilateur (40) de la machine-outil (1) étant disposé sur le rotor (37) du moteur (5),
    b) générer une dépression à l'aide du ventilateur (40), cela provoquant un flux d'air (35) dans la machine-outil (1),
    c) refroidir les composants (32, 20, 34, 5, 38, 22) de la machine-outil (1) au moyen du flux d'air (35) généré lors de l'étape b) du procédé,
    le refroidissement des composants (32, 20, 34, 5, 38, 22) de la machine-outil (1) s'effectuant dans l'ordre i) à iv).
EP21814765.0A 2020-12-04 2021-11-17 Machine-outil pourvu de refroidissement à air et procédé de refroidissement des composants d'une machine-outil Active EP4255671B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20211896.4A EP4008477A1 (fr) 2020-12-04 2020-12-04 Machine-outil pourvu de refroidissement à air et procédé de refroidissement des composants d'une machine-outil
PCT/EP2021/081927 WO2022117336A1 (fr) 2020-12-04 2021-11-17 Machine-outil à refroidissement par air et procédé de refroidissement d'éléments de machine-outil

Publications (3)

Publication Number Publication Date
EP4255671A1 EP4255671A1 (fr) 2023-10-11
EP4255671B1 true EP4255671B1 (fr) 2026-02-18
EP4255671C0 EP4255671C0 (fr) 2026-02-18

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EP20211896.4A Withdrawn EP4008477A1 (fr) 2020-12-04 2020-12-04 Machine-outil pourvu de refroidissement à air et procédé de refroidissement des composants d'une machine-outil
EP21814765.0A Active EP4255671B1 (fr) 2020-12-04 2021-11-17 Machine-outil pourvu de refroidissement à air et procédé de refroidissement des composants d'une machine-outil

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US (1) US12365078B2 (fr)
EP (2) EP4008477A1 (fr)
JP (1) JP2023546497A (fr)
CN (1) CN116367966A (fr)
WO (1) WO2022117336A1 (fr)

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Also Published As

Publication number Publication date
US20230415324A1 (en) 2023-12-28
US12365078B2 (en) 2025-07-22
EP4255671A1 (fr) 2023-10-11
JP2023546497A (ja) 2023-11-02
WO2022117336A1 (fr) 2022-06-09
CN116367966A (zh) 2023-06-30
EP4008477A1 (fr) 2022-06-08
EP4255671C0 (fr) 2026-02-18

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