Machine tool cooling device

Abstract

Portable machine tool with a machine tool cooling device, which has at least one cooling unit (14a; 14b; 14c; 14d; 14e; 14f) generating a cooling fluid flow at least for cooling a drive unit (16a; 16b; 16c; 16d; 16e; 16f) of the portable machine tool, wherein at least one further cooling unit (18a; 18b; 18c; 18d; 18e; 18f) is provided for generating a further cooling fluid flow, which is designed differently from the cooling unit (14a; 14b; 14c; 14d; 14e; 14f) for cooling the drive unit (16a; 16b; 16c; 16d; 16e; 16f), characterized in that the cooling unit (14b; 14c; 14d; 14e) has a rotation axis (24b; 24c; 24d; 24e) which is arranged offset at least substantially parallel to a rotation axis (32b; 32c; 32d; 32e) of the further cooling unit (18b; 18c; 18d; 18e).

Description

Prior ArtDE 10 2005 007 546 A1 already discloses a portable power tool having a power tool cooling device, wherein the power tool cooling device has a cooling unit which generates a cooling fluid flow for cooling a drive unit of the portable power tool and a passive cooling body which is cooled by means of the cooling fluid flow of the cooling unit.Furthermore, a portable power tool with a power tool cooling device is already known from DE 196 00 339 C1, wherein the power tool cooling device has a cooling unit which generates a cooling fluid flow for cooling a drive unit of the portable power tool. The cooling unit here comprises a single dual fan wheel which is provided to provide a cooling fluid flow for cooling the drive unit and a further cooling fluid flow for cooling a transmission unit of the portable power tool.Comparable portable power tools with a power tool cooling device are also known from DE 698 16 512 T2, DE 39 42 083 A1, DE 10 2007 038 555 A1 and DE 10 2005 062 697 A1.DE 103 29 828 A1 discloses a machine tool having a machine tool cooling device which comprises at least one further cooling unit for generating a further cooling fluid flow, which cooling unit is configured differently from the cooling unit for cooling the drive unit.Disclosure of the InventionThe invention is based on a portable power tool having a power tool cooling device which has at least one cooling unit which generates a cooling fluid flow, at least for cooling a drive unit of the portable power tool.It is proposed that the cooling unit of the power tool cooling device has an axis of rotation which is arranged at least substantially parallel offset with respect to an axis of rotation of the further cooling unit. The term "cooling unit" is intended here in particular to define a unit which is specifically provided for extracting heat (thermal energy) from an element and / or a unit and / or for discharging it, in particular by means of convection. "Provided" is to be understood in particular as specially designed and / or specially equipped. The fact that an element and / or a unit is provided for a specific function is to be understood in particular to mean that the element and / or the unit fulfil / fulfil and / or execute / executes this specific function in at least one application state and / or operating state. The cooling unit for cooling the drive unit is designed in particular as a main cooling unit. Preferably, the cooling unit for cooling the drive unit is designed as a fan wheel unit. Thus, the cooling unit for cooling the drive unit is provided at least for generating a cooling fluid flow which removes at least thermal energy from the drive unit. In this case, the cooling unit is preferably designed as an active cooling unit. However, it is also conceivable for the cooling unit to have a different configuration that appears expedient to a person skilled in the art, such as, for example, a configuration as a cooling pump unit, as a heat exchanger unit or the like. "substantially parallel" is to be understood here in particular as an alignment of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation with respect to the reference direction in particular of less than 8°, advantageously of less than 5° and particularly advantageously of less than 2°. By means of the configuration according to the invention, a compact arrangement of the cooling unit and of the further cooling unit can advantageously be made possible.A "portable machine tool" is to be understood here in particular as a machine tool for machining workpieces, which can be transported by an operator without a transport machine. The portable power tool has in particular a mass which is less than 40 kg, preferably less than 10 kg and particularly preferably less than 5 kg. In this case, the portable power tool can be designed as a drilling and / or chisel hammer, as a percussion drilling machine, as an electrically or pneumatically driven screw driver, as a saber saw, as an electrically or pneumatically driven planing machine, as an electrically or pneumatically driven grinding machine or as another portable power tool that appears expedient to a person skilled in the art. The portable power tool can be configured to be wired or battery-powered. The portable power tool is thus preferably designed as a hand-held power tool. By means of the configuration according to the invention, advantageous cooling of components of the portable power tool can be achieved. This advantageously allows a long service life of the portable power tool to be made possible.The further cooling unit is in particular designed as a secondary cooling unit. In this case, the further cooling unit is preferably designed as a fan wheel unit. Thus, the further cooling unit is preferably designed as an active cooling unit. However, it is also conceivable for the further cooling unit to have a different configuration that appears expedient to a person skilled in the art, such as, for example, a configuration as a cooling pump unit, as a heat exchanger unit or the like. The further cooling unit is preferably provided at least for the purpose of generating a cooling fluid flow which removes at least thermal energy from at least one unit of the portable power tool which is preferably configured differently from the drive unit. The unit of the portable power tool to which the cooling fluid flow of the further cooling unit is assigned can be designed here as an electronic unit, as a striking mechanism unit, as a transmission unit, as an operating unit, as an electrical output unit or as another unit that appears expedient to a person skilled in the art. However, it is also conceivable for the further cooling unit to be provided at least for the purpose of generating a cooling fluid flow which removes at least thermal energy from the drive unit.To enable an advantageous cooling capacity, the cooling unit and / or the further cooling unit can / can each have at least one additional, passive cooling body, which is arranged on the unit to which the respective cooling fluid flow of the cooling unit and / or of the further cooling unit is assigned. A "cooling body" is to be understood in particular as an element and / or a unit which is / are formed specifically for cooling further components, in particular an electronics unit, and is in particular in thermal and preferably direct mechanical contact with these components. For delivering thermal energy to the environment, the heat sink has in particular an at least 5-fold, in particular at least 10-fold, advantageously at least 20-fold and particularly advantageously at least 50-fold larger surface than a cube of the same volume and comprises in particular at least 3, in particular at least 10 and advantageously at least 20 cooling ribs. In this case, a "cooling fin" is to be understood as meaning an elongate, in particular wall- or rod-shaped, component made of a thermally conductive material, which is connected, in particular in one piece, at least at one point to a main body of the cooling body. A "main body of the cooling body" is to be understood in particular as a component made of a thermally conductive material, which has at least one surface which is in thermal contact with a component to be cooled. The entire cooling body preferably consists of a thermally conductive material and in particular has a plate-shaped base body from which cooling ribs extend, preferably only on one side of the base body. In particular, the cooling body is designed specifically for transferring heat to an air flow flowing along at least one of the surfaces of the cooling body and preferably has air flow channels through which an air flow can be conducted for cooling the cooling body. By "one-piece" is to be understood, in particular, as being connected at least in a materially integral manner, for example by a welding process, an adhesive bonding process, an injection molding process and / or another process that appears expedient to the person skilled in the art, and / or advantageously formed in one piece, such as, for example, by production from a casting and / or by production in a single- or multicomponent injection molding process and advantageously from a single blank.The expression "differently formed" is intended here to define in particular a configuration of an element and / or a unit relative to a configuration of a further element and / or a further unit, wherein the element and / or the unit is / are formed in particular separately from the further element and / or from a further unit. Thus, the further cooling unit is preferably formed separately from the cooling unit. The cooling unit can be in direct contact with the further cooling unit, in particular for driving cooling fluid flow generating elements of the cooling unit and of the further cooling unit. In an alternative embodiment of the power tool cooling device, the cooling unit has its own unit for driving and the further cooling unit likewise has its own unit for driving. The configuration according to the invention of the power tool cooling device advantageously allows an additional cooling fluid flow to be generated, which can be used for high-performance cooling of components of the portable power tool. In addition, in the event of a failure of the cooling unit or of the further cooling unit, it can advantageously be ensured that at least one cooling fluid flow for cooling components of the portable power tool can be generated. Thus, a high level of safety against overheating of components of the portable power tool can be ensured in an advantageous manner.It is furthermore proposed that the cooling unit has at least one cooling fluid flow generating element which is formed separately from a cooling fluid flow generating element of the further cooling unit. The cooling fluid flow generating element of the cooling unit is preferably designed as a fan wheel. However, it is also conceivable for the cooling fluid flow generating element of the cooling unit to have a different configuration that appears expedient to a person skilled in the art, such as a configuration as a cooling fluid pump element or the like. However, it is also conceivable for the cooling fluid flow generating element of the further cooling unit to have a different configuration that appears expedient to a person skilled in the art, such as, for example, a configuration as a cooling fluid pump element or the like. By means of the configuration of the power tool cooling device according to the invention, advantageously two separate cooling fluid flows can be provided for cooling components of the portable power tool. In addition, two separate cooling air channels can be supplied with a cooling fluid flow in each case. Reliable cooling of components of the portable power tool can thus be made possible. Preferably, the cooling fluid flow generating element of the cooling unit is drivable rotatably about the axis of rotation of the cooling unit. Preferably, the cooling fluid flow generating element of the further cooling unit is rotatable and the axis of rotation of the further cooling unit is drivable.It is furthermore proposed that the cooling unit has at least one cooling fluid flow generating element which, viewed along an axis of rotation of the cooling unit, is arranged at a relative distance from a cooling fluid flow generating element of the further cooling unit. By "arranged at a distance" is herein in particular an arrangement of an element and / or a unit relative to a further element and / or a further unit to be understood, wherein a smallest distance between the element and / or the unit and the further element and / or the further unit is in particular greater than 0.01 mm, preferably greater than 0.1 mm and particularly preferably greater than 1 mm, in particular viewed along a direction running at least substantially parallel to the axis of rotation of the cooling unit. Preferably, the cooling fluid flow generating element of the cooling unit and the cooling fluid flow generating element of the further cooling unit are arranged on a common drive axis. Preferably, the machine tool cooling device comprises at least one cooling fluid suction opening which is associated with the cooling unit and at least one cooling fluid suction opening which is associated with the further cooling unit. By means of the configuration according to the invention, it is thus advantageously possible to convey, in particular suction, cooling fluid at two different positions. An advantageous cooling capacity for cooling components of the portable power tool can thus be made possible. In particular as a result of an assignment of a cooling fluid suction opening in each case to the respective cooling unit, a large total amount of cooling fluid can advantageously be conveyed for cooling components of the portable power tool.It is also proposed that the cooling unit and the further cooling unit can be driven by means of the drive unit. The drive unit is preferably designed as an electric motor unit. However, it is also conceivable for the drive unit to have a different configuration that appears expedient to a person skilled in the art, such as, for example, a configuration as a hybrid drive unit, as a combustion drive unit, as a pneumatic drive unit, as a hydraulic drive unit or the like. By means of the configuration according to the invention of the power tool cooling device, it is advantageously possible to save components for driving the cooling unit and the further cooling unit. In addition, a compact arrangement of the cooling unit and the further cooling unit can advantageously be made possible.The power tool cooling device advantageously comprises at least one drive force transmission unit which is provided for the purpose of connecting the cooling unit to the further cooling unit in terms of drive technology. Here, "connected by drive technology" is to be understood in particular as a connection between at least two elements and / or at least two units, by means of which a transmission of drive forces from one element and / or one unit to the other element and / or the other unit can be realized, in particular as a result of a mechanical connection of the elements and / or the units. By means of the configuration according to the invention, a high flexibility with regard to an arrangeability of the cooling unit relative to the further cooling unit can advantageously be achieved. In addition, an advantageous use of a drive power of the drive unit for driving the cooling unit and the further cooling unit can be made possible.In one configuration of the power tool cooling device according to the invention, the drive force transmission unit has at least one toothing for a drive connection of the cooling unit to the further cooling unit. In this case, it is conceivable for the toothing to be formed as part of a transmission unit of the drive force transmission unit, which is provided for a connection between at least one drive element, in particular a drive shaft, of the cooling unit and a drive element, in particular a drive shaft, of the further cooling unit. The toothing is preferably designed as an external toothing which is arranged on an outer periphery of the cooling fluid flow generating element of the cooling unit and / or of the cooling fluid flow generating element of the further cooling unit. In this case, the toothing can be arranged by means of a form-fitting, force-fitting and / or material-fitting connection on the cooling fluid flow generating element of the cooling unit and / or on the cooling fluid flow generating element of the further cooling unit. Particularly preferably, a part of the toothing is formed integrally with the cooling fluid flow generating element of the cooling unit and a part of the toothing is preferably formed integrally with the cooling fluid flow generating element of the further cooling unit. By means of the configuration according to the invention, a drive connection between the cooling unit and the further cooling unit can be realized in a structurally simple manner.In a further configuration of the power tool cooling device according to the invention, the drive force transmission unit has at least one wrap element for drive connection of the cooling unit to the further cooling unit. A "wrap element" is to be understood here in particular as an element which, for transmitting drive forces, at least partially wraps around a drive element, in particular a drive shaft or the cooling fluid flow generating element, and is thus drivable by the drive element. The wrapping element can be designed as a belt (toothed belt, round belt, flat belt or the like), as a belt, as a chain or the like. By means of the configuration according to the invention of the power tool cooling device, a quiet and quiet drive can advantageously be made possible. In addition, shocks in the drive train can be advantageously damped. Furthermore, as far as possible maintenance-free operation is advantageously possible.It is furthermore proposed that the further cooling unit is at least partially formed integrally with the electronics unit for cooling an electronics unit of the portable power tool. The cooling unit is preferably at least partially integrated into a printed circuit board or a printed circuit board of the electronics unit. By means of the configuration of the power tool cooling device according to the invention, reliable cooling of the electronics unit can advantageously be achieved. The electronics unit can advantageously be reliably protected against overheating. Thus, a long life of the electronic unit can be advantageously achieved.It is furthermore proposed that the portable power tool comprises at least one housing unit on which at least the cooling unit and the further cooling unit are arranged. Preferably, the cooling unit and the further cooling unit are arranged in the housing unit. Thus, the housing unit encloses in particular the cooling unit and the further cooling unit. The housing unit can have a shell construction, a pot construction or a combination of a shell construction and a pot construction. Particularly preferably, the housing unit has at least two housing shell elements which can be connected to one another, in particular can be connected detachably to one another. By means of the configuration of the machine tool according to the invention, reliable cooling of components of the portable machine tool arranged in the housing unit can advantageously be achieved.It is further proposed that the housing unit comprises at least one air inlet region which is assigned to at least the further cooling unit, and comprises at least one further air inlet region which is assigned to at least the cooling unit. As a result, a large amount of ambient air can advantageously be conveyed into the housing unit for cooling. Thus, sufficient cooling of components of the portable machine tool can be advantageously achieved.It is also proposed that the air inlet region and the further air inlet region are connected to one another by means of at least one cooling fluid duct of the housing unit. Thus, an advantageous delivery of cooling fluid for cooling within the housing unit can be made possible.The power tool cooling device according to the invention and / or the portable power tool according to the invention should / should not be limited to the application and embodiment described above. In particular, the power tool cooling device according to the invention and / or the portable power tool according to the invention can / can have a number which differs from a number of individual elements, components and units mentioned herein in order to fulfil a mode of operation described herein.DRAWINGFurther advantages are evident from the following description of the drawings. Six exemplary embodiments of the invention are shown in the drawing. The drawings, specification and claims contain numerous features in combination. The skilled person will expediently also consider the features individually and summarize them to form meaningful further combinations.The following are shown: FIG. 1 shows a schematic illustration of a portable power tool according to the invention with a power tool cooling device according to the invention, FIG. 2 shows a schematic illustration of a detail view of the power tool cooling device according to the invention, FIG. 3 shows an alternative portable power tool according to the invention with an alternative power tool cooling device according to the invention, which comprises a drive force transmission unit, in a schematic illustration, FIG. 4 shows a schematic illustration of a further alternative portable power tool according to the invention with a further alternative power tool cooling device according to the invention, which comprises an alternative drive force transmission unit, FIG. 5 shows a schematic illustration of a further alternative portable power tool according to the invention with a further alternative power tool cooling device according to the invention, which comprises at least two separate cooling fluid ducts, FIG. 6 shows a schematic representation of a further alternative portable power tool according to the invention with a further alternative power tool cooling device according to the invention, which is at least partially integrated into an electronics unit of the portable power tool, and FIG. 7 shows a schematic illustration of a further alternative portable power tool according to the invention with a further alternative power tool cooling device according to the invention, which is at least partially integrated into an electronics unit of the portable power tool.DESCRIPTION OF THE EMBODIMENTSFIG. 1 shows a portable power tool 12 awith a power tool cooling device 10 a. The portable machine tool 12 ais designed as a drill hammer and / or chisel hammer. In this case, the portable power tool 12 ais designed as a cable-bound drilling and / or chisel hammer. However, it is also conceivable for the portable power tool 12 ato have a different configuration that appears expedient to a person skilled in the art, such as, for example, a configuration as an rechargeable battery-operated drilling and / or bit hammer, as a rechargeable battery-operated drill wrench or the like. The main handle 40 ais arranged on a side of the portable machine tool 12 afacing away from a tool holder 44 aof the portable machine tool 12 a. Here, the main handle 40a is pivotally supported on a housing unit 38a of the portable machine tool 12a. A pivot axis of the main handle 40 aruns at least substantially transversely to a rotation axis 54 aof the tool holder 44 a.The housing unit 38 ais provided to accommodate at least one drive unit 16 aand at least one output unit 48 aof the portable machine tool 12 a. The output unit 48 aincludes a striking mechanism unit 50 ato generate a striking pulse. The drive unit 16 aand the output unit 48 atogether act to generate a percussion impulse on the tool holder 44 aand / or on a machining tool 52 aarranged in the tool holder 44 ain a manner already known to a person skilled in the art. The drive unit 16 ais designed as an AC electric motor unit. In an alternative embodiment, not shown in detail here, the drive unit 16 ais designed as an EC electric motor unit. However, it is also conceivable for the drive unit 16 ato have a different configuration that appears expedient to a person skilled in the art, in particular in the case of a battery-operated configuration of the portable power tool 12 a, the drive unit 16 ais preferably configured as a DC electric motor unit. A drive rotation axis 56 aof the drive unit 16 aruns at least substantially transversely to the rotation axis 54 aof the tool holder 44 a. Here, the drive rotation axis 56 aof the drive unit 16 aruns at least substantially perpendicular to the rotation axis 54 aof the tool holder 44 a.The housing unit 38a has a shell-type construction. The housing unit 38 athus comprises at least two housing shell elements 46 a, 64 a(FIG. 2 ; in FIG. 1, only one of the housing shell elements 46 ais illustrated), which can be detachably connected to one another in a connecting plane in a manner already known to a person skilled in the art. However, it is also conceivable for the housing unit 38 ato have a pot construction or a combination of a shell construction and a pot construction.FIG. 2 is a sectional view of the portable machine tool 12 aalong the line II-II of FIG. 1 ; an arrangement of the machine tool cooling device 10 ais illustrated in the sectional view. The machine tool cooling device 10 afor the portable machine tool 12 aincludes at least one cooling unit 14 athat generates a cooling fluid flow at least for cooling the drive unit 16 aof the portable machine tool 12 a. The cooling unit 14 afor cooling the drive unit 16 ahere forms a main cooling unit. The cooling unit 14 ais designed as a fan wheel unit. The cooling unit 14 athus comprises at least one cooling fluid flow generating element 20 a, which is embodied as a fan wheel, for generating a cooling fluid flow. However, it is also conceivable for the cooling fluid flow generating element 20 aof the cooling unit 14 ato have a different configuration for generating a cooling fluid flow, which appears expedient to a person skilled in the art. The cooling unit 14 acan be driven by means of the drive unit 16 ato generate a cooling fluid flow. The cooling fluid flow generating element 20 aof the cooling unit 14 ais arranged here on a side of the drive unit 16 afacing the output unit 48 a. For driving the cooling fluid flow generating element 20 aof the cooling unit 14 a, the cooling fluid flow generating element 20 ais arranged on a drive element 58 aof the drive unit 16 ain a rotationally fixed manner. The drive element 58 ais designed as a drive shaft of the drive unit 16 a. Thus, the cooling fluid flow generating element 20 aof the cooling unit 14 ais connected in a rotationally fixed manner to the drive shaft of the drive unit 16 a.Furthermore, the power tool cooling device 10 aincludes at least one further cooling unit 18 afor generating a further cooling fluid flow, which cooling unit is configured differently from the cooling unit 14 afor cooling the drive unit 16 a. The further cooling unit 18 ain this case forms a secondary cooling unit which is provided in addition to the cooling unit 14 a. The further cooling unit 18 ais designed as a fan wheel unit. The further cooling unit 18 athus comprises at least one cooling fluid flow generating element 22 a, which is embodied as a fan wheel, for generating a cooling fluid flow. However, it is also conceivable for the cooling fluid flow generating element 22 aof the further cooling unit 18 ato generate a cooling fluid flow to have a different configuration that appears expedient to a person skilled in the art. The further cooling unit 18 acan be driven by means of the drive unit 16 ato generate a further cooling fluid flow. Thus, the cooling unit 14 aand the further cooling unit 18 acan be driven by means of the drive unit 16 a. The cooling fluid flow generating element 22 aof the further cooling unit 18 ais connected in a rotationally fixed manner to the drive element 58 aof the drive unit 16 a. In addition, the cooling fluid flow generating element 22 aof the further cooling unit 18 ais arranged on a side of the drive unit 16 afacing away from the output unit 48 a. Here, the cooling fluid flow generating element 22 aof the further cooling unit 18 ais integrated into the drive unit 16 a. Thus, the cooling fluid flow generating element 22 aof the further cooling unit 18 ais arranged in a drive unit housing of the drive unit 16 a.The cooling fluid flow generating element 22 aof the further cooling unit 18 ais formed separately from the cooling fluid flow generating element 20 aof the cooling unit 14 a. Thus, the cooling unit 14 aincludes at least one cooling fluid flow generating element 20 a, which is formed separately from a cooling fluid flow generating element 22 aof the further cooling unit 18 a. Furthermore, the cooling fluid flow generating element 22 aof the further cooling unit 18 ais arranged at the drive element 58 aof the drive unit 16 arelatively spaced apart from the cooling fluid flow generating element 20 aof the cooling unit 14 a. Here, the cooling fluid flow generating element 22 aof the further cooling unit 18 ais arranged at a relative distance from the cooling fluid flow generating element 20 aof the cooling unit 14 a, as viewed along an axis of rotation 24 aof the cooling unit 14 a. Thus, the cooling unit 14 aincludes at least one cooling fluid flow generating element 20 awhich, viewed along an axis of rotation 24 aof the cooling unit 14 a, is arranged relatively spaced apart from a cooling fluid flow generating element 22 aof the further cooling unit 18 a. Thus, the cooling unit 14 aand the further cooling unit 18 aare arranged axially spaced apart relative to one another. The axis of rotation 24 aof the cooling unit 14 ais arranged coaxially with the axis of rotation 56 aof the drive unit 16 a. Here, the drive rotation axis 56 aof the drive unit 16 aconstitutes the rotation axis 24 aof the cooling unit 14 a, about which the cooling fluid flow generating element 20 aof the cooling unit 14 acan be driven in rotation. In addition, the drive rotation axis 56 aof the drive unit 16 aconstitutes a rotation axis 32 aof the further cooling unit 18 a, about which the cooling fluid flow generating element 22 aof the further cooling unit 18 acan be driven in rotation. The axis of rotation 24 aof the cooling unit 14 ais thus aligned coaxially with the axis of rotation 32 aof the further cooling unit 18 a. The drive rotation axis 56 a, due to the arrangement of the cooling fluid flow generating element 20 aof the cooling unit 14 aand the cooling fluid flow generating element 22 aof the further cooling unit 18 aon the drive element 58 aof the drive unit 16 a, forms a drive force transmission unit which is provided to connect the cooling unit 14 ato the further cooling unit 18 ain a drive-driven manner.The cooling unit 14 aand the further cooling unit 18 aare arranged on the housing unit 38 aof the portable machine tool 12 a. Here, the cooling unit 14 aand the further cooling unit 18 aare arranged in the housing unit 38 aof the portable machine tool 12 a. Thus, the housing shell elements 46 aof the housing unit 38 asurround the cooling unit 14 aand the further cooling unit 18 a. The housing unit 38 acomprises at least one air inlet region 60 ato enable generation of cooling fluid flows by means of the cooling unit 14 aand the further cooling unit 18 a. The air inlet portion 60a includes at least one air inlet opening 62a. Overall, the air inlet region 60 acomprises a multiplicity of air inlet openings 62 a, which have a configuration already known to a person skilled in the art. The air inlet region 60 ais arranged on the housing unit 38 ain this case on a side of the drive unit 16 afacing away from the output unit 48 a. By means of the further cooling unit 18 a, in particular by means of a rotating drive of the cooling fluid flow generating element 22 aof the further cooling unit 18 a, ambient air can be conveyed through the air inlet openings 62 aof the air inlet region 60 ainto the housing unit 38 a. A partial region of the housing unit 38 a, which extends from the air inlet region 60 ato at least the drive unit 16 a, thus forms a first cooling fluid channel of the power tool cooling device 10 a. In this partial region of the housing unit 38 aand thus in the first cooling fluid channel, an electronics unit 34 aof the portable power tool 12 ais arranged. Thus, the electronic unit 34 ais cooled as a result of conveying ambient air by means of the further cooling unit 18 a.As a result of the arrangement of the further cooling unit 18 awithin the drive unit housing of the drive unit 16 a, the ambient air sucked into the housing unit 38 athrough the air inlet openings 62 aof the air inlet region 60 acan be conveyed into the drive unit housing of the drive unit 16 a. In this way, cooling of the drive unit 16 a, in particular of a commutator of the drive unit 16 a, can be ensured in an advantageous targeted manner. The drive unit housing of the drive unit 16 aincludes at least one cooling air outlet opening through which the ambient air conveyed by means of the further cooling unit 18 acan emerge from the drive unit housing of the drive unit 16 a. The cooling air outlet opening of the drive unit housing of the drive unit 16 ais in direct connection here with a further cooling fluid channel of the power tool cooling device 10 a. The further cooling fluid channel of the power tool cooling device 10 aextends here at least starting from a further air inlet region 66 aof the housing unit 38 ato an air outlet region 70 aof the housing unit 38 a. The first cooling fluid channel and the further cooling fluid channel can be formed directly adjacent to one another. Thus, the air inlet region 60 aand the further air inlet region 68 aare connected to one another by means of at least one cooling fluid duct of the housing unit 38 a. However, it is also conceivable for the first cooling fluid channel and the further cooling fluid channel to be formed spatially separated from one another and to each extend separately as far as the air outlet region 70 aof the housing unit 38 a. The further air inlet region 66 aof the housing unit 38 aincludes at least one air inlet opening 68 a. Overall, the further air inlet region 66 acomprises a multiplicity of air inlet openings 68 a, which have a configuration already known to a person skilled in the art. The further air inlet region 66 ais arranged spaced apart relative to the air inlet region 60 a. In this case, the further air inlet region 66 ais arranged spaced apart relative to the air inlet region 60 a, as viewed along the drive rotation axis 56 a. The air outlet portion 70 aof the housing unit 38 aincludes at least one air outlet opening 72 a. Overall, the further air inlet region 66 acomprises a multiplicity of air inlet openings 68 a, which have a configuration already known to a person skilled in the art. The air outlet region 70 ais arranged spaced apart relative to the further air inlet region 66 a. In this case, the air outlet region 70 ais arranged spaced apart relative to the further air inlet region 66 a, as viewed along the drive rotation axis 56 a. Thus, the housing unit 38 aincludes at least one air inlet region 60 awhich is associated with at least the further cooling unit 18 aand at least one further air inlet region 68 awhich is associated with at least the cooling unit 14 a.By means of the cooling unit 14 a, in particular by means of a rotating drive of the cooling fluid flow generating element 20 aof the cooling unit 14 a, ambient air can be conveyed through the air inlet openings 68 aof the further air inlet region 66 ainto the housing unit 38 a, which can be mixed by means of the ambient air exiting from the drive unit housing of the drive unit 16 aand previously conveyed by means of the further cooling unit 18 a. Thus, a large total amount of ambient air conveyable through the housing unit 38 afor cooling can be advantageously conveyed by means of the cooling unit 14 aand the further cooling unit 18 a, which can be used for advantageous cooling of components of the portable power tool 12 aarranged within the housing unit 38 a, such as the drive unit 16 a, the electronics unit 64 a, the striking mechanism unit 50 aor the like.In FIGS. 3 to 7 further exemplary embodiments of the invention are shown. The following descriptions and the drawings are limited substantially to the differences between the exemplary embodiments, wherein with regard to identically denoted components, in particular with regard to components with the same reference numerals, reference can in principle also be made to the drawings and / or the description of the other exemplary embodiments, in particular to FIGS. 1 and 2. To distinguish between the exemplary embodiments, the letter a is appended to the reference numerals of the exemplary embodiment in FIGS. 1 and 2. In the exemplary embodiments of FIGS. 3 to 7, the letter a is replaced by the letters b to f.FIG. 3 shows an alternative portable power tool 12 bwith an alternative power tool cooling device 10 b. The portable power tool 12 bis designed as a percussion drilling machine. However, it is also conceivable for the portable power tool 12 bto have a different configuration that appears expedient to a person skilled in the art. The portable machine tool 12 bhas a housing unit 38 bprovided to enclose a drive unit 16 band an output unit 48 b. The housing unit 38 bhas a shell construction. The housing unit 38 bthus comprises at least two housing shell elements 46 b(only one of the housing shell elements 46 bis illustrated in FIG. 3 ), which can be detachably connected to one another in a connecting plane in a manner already known to a person skilled in the art. However, it is also conceivable for the housing unit 38 bto have a pot construction or a combination of a shell construction and a pot construction. The portable machine tool 12 bfurther includes a main handle 40 bintegrally formed with the housing unit 38 b. In addition, the portable power tool 12 bincludes an auxiliary handle 42 b, which can be releasably arranged on the housing unit 38 b.The output unit 48 bincludes a striking mechanism unit 50 bto generate a striking pulse. The drive unit 16 band the output unit 48 boperate to generate a percussion impulse on a tool holder 44 bof the portable power tool 12 band / or on a machining tool (not shown in more detail here) arranged in the tool holder 44 bin a manner already known to a person skilled in the art. The drive unit 16 bis designed as a DC electric motor unit. In an alternative embodiment, not shown in detail here, the drive unit 16 bis designed as an EC electric motor unit. However, it is also conceivable for the drive unit 16 bto have a different configuration that appears expedient to a person skilled in the art. A drive rotation axis 56 bof the drive unit 16 bruns at least substantially parallel to a rotation axis 54 bof the tool holder 44 b.The machine tool cooling device 10 bshown in FIG. 3 for the portable machine tool 12 bhas at least one cooling unit 14 bgenerating a cooling fluid flow, at least for cooling the drive unit 16 bof the portable machine tool 12 b. Furthermore, the power tool cooling device 10 bhas at least one further cooling unit 18 bfor generating a further cooling fluid flow, which cooling unit is configured differently from the cooling unit 14 bfor cooling the drive unit 16 b. The cooling unit 14 band the further cooling unit 18 bare arranged on the housing unit 38 b. Here, the cooling unit 14 band the further cooling unit 18 bare arranged in the housing unit 38 b. The further cooling unit 18 bis provided in particular for cooling an electronics unit 34 bof the portable power tool 12 barranged in the housing unit 38 b.The cooling unit 14 band the further cooling unit 18 bare each designed as a fan wheel unit. Here, the cooling unit 14 bhas at least one cooling fluid flow generating element 20 b, which is formed separately from a cooling fluid flow generating element 22 bof the further cooling unit 18 b. The cooling fluid flow generating element 20 bof the cooling unit 14 band the cooling fluid flow generating element 22 bof the further cooling unit 18 bare each designed as a fan wheel. Here, the cooling fluid flow generating element 20 bof the cooling unit 14 band the cooling fluid flow generating element 22 bof the further cooling unit 18 bare arranged spaced apart from one another, as viewed along an at least substantially transverse direction to a drive rotation axis 56 bof the drive unit 16 b. The cooling unit 14 band the further cooling unit 18 bcan be driven by means of the drive unit 16 b. Here, the cooling fluid flow generating element 20 bof the cooling unit 14 bis connected in a rotationally fixed manner to a drive element 58 bof the drive unit 16 b. Thus, the drive rotation axis 56 bof the drive unit 16 bconstitutes a rotation axis 24 bof the cooling unit 14 b.Furthermore, the machine tool cooling device 10 bincludes at least one drive force transmission unit 26 bprovided for drivingly connecting the cooling unit 14 bto the further cooling unit 18 b. Here, the drive force transmission unit 26 bhas at least one wrap element 30 bfor drive connection of the cooling unit 14 bto the further cooling unit 18 b. For a drive connection of the cooling unit 14 bto the further cooling unit 18 b, the wrap element 30 bis at least partially wrapped around the cooling fluid flow generating element 20 bof the cooling unit 14 band the cooling fluid flow generating element 22 bof the further cooling unit 18 b. Thus, the cooling fluid flow generating element 20 bof the cooling unit 14 band the cooling fluid flow generating element 22 bof the further cooling unit 18 bare connected to one another in terms of drive technology by means of the wrap element 30 b. The cooling unit 14 bhas the axis of rotation 24 b, which is arranged at least substantially parallel offset with respect to an axis of rotation 32 bof the further cooling unit 18 b. With regard to further features and functions of the power tool cooling device 10 billustrated in FIG. 3, reference may be made to the description of the power tool cooling device 10 adescribed in FIGS. 1 and 2.FIG. 4 shows an alternative portable power tool 12 chaving an alternative power tool cooling device 10 c, which comprises at least one cooling unit 14 cthat generates a cooling fluid flow at least for cooling a drive unit 16 cof the portable power tool 12 cand at least one further cooling unit 18 cthat generates a further cooling fluid flow and is configured differently from the cooling unit 14 cfor cooling the drive unit 16 c. The portable power tool 12 cillustrated in FIG. 4 has an at least substantially analogous configuration to the portable power tool 12 bdescribed in FIG. 3. The power tool cooling device 10 cillustrated in FIG. 4 has an at least substantially analogous configuration to the power tool cooling device 10 billustrated in FIG. 3. In contrast to the power tool cooling device 10 billustrated in FIG. 3, the power tool cooling device 10 cillustrated in FIG. 4 has at least one drive force transmission unit 26 cprovided for the purpose of drivingly connecting the cooling unit 14 cto the further cooling unit 18 c, wherein the drive force transmission unit 26 chas at least one toothing 28 cfor the purpose of drivingly connecting the cooling unit 14 cto the further cooling unit 18 c. Here, the drive force transmission unit 26 ccomprises at least one toothed element 74 cwhich is formed integrally with a transmission element 78 cof an output unit 48 cof the portable power tool 12 c. The transmission element 78 cis designed as a planetary gear transmission element, in particular as a ring gear, of the output unit 48 c, which is at least partially designed as a planetary gear. Furthermore, the drive force transmission unit 26 ccomprises at least one further toothing element 76 cwhich is formed integrally with a cooling fluid flow generating element 22 cof the further cooling unit 18 c. The further toothed element 76 cis arranged on an outer periphery of the cooling fluid flow generating element 22 cof the further cooling unit 18 c, which is designed as a fan wheel. The toothed element 74 cmeshes here with the further toothed element 76 cto produce a rotational drive of the further cooling unit 18 c, in particular of the cooling fluid flow generating element 22 cof the further cooling unit 18 c. With regard to further features and functions of the power tool cooling device 10 cillustrated in FIG. 4, reference may be made to the description of the power tool cooling device 10 adescribed in FIGS. 1 and 2.FIG. 5 shows an alternative portable power tool 12 dhaving an alternative power tool cooling device 10 d, which comprises at least one cooling unit 14 dwhich generates a cooling fluid flow at least for cooling a drive unit 16 dof the portable power tool 12 dand at least one further cooling unit 18 dfor generating a further cooling fluid flow, which cooling unit is configured differently from the cooling unit 14 dfor cooling the drive unit 16 d. The portable power tool 12 dillustrated in FIG. 5 has an at least substantially analogous configuration to the portable power tool 12 bdescribed in FIG. 3. The power tool cooling device 10 dillustrated in FIG. 5 has an at least substantially analogous configuration to the power tool cooling device 10 billustrated in FIG. 3. In contrast to the power tool cooling device 10 billustrated in FIG. 3, the power tool cooling device 10 dillustrated in FIG. 5 has at least one drive force transmission unit 26 dwhich is provided for the purpose of drivingly connecting the cooling unit 14 dto the further cooling unit 18 d, wherein the drive force transmission unit 26 dhas at least one toothing 28 dfor the purpose of drivingly connecting the cooling unit 14 dto the further cooling unit 18 d. Here, the driving force transmission unit 26 dcomprises at least one toothing element 74 dwhich is formed integrally with a cooling fluid flow generating element 20 dof the cooling unit 14 d. The toothing element 74 dis arranged on an outer periphery of the cooling fluid flow generating element 20 dof the cooling unit 14 d, which cooling fluid flow generating element is designed as a fan wheel. Furthermore, the drive force transmission unit 26 dcomprises at least one further toothing element 76 dwhich is formed integrally with a cooling fluid flow generating element 22 dof the further cooling unit 18 d. The further toothed element 76 dis arranged on an outer periphery of the cooling fluid flow generating element 22 d, which is designed as a fan wheel, of the further cooling unit 18 d. The toothing element 74 dis in mesh with the further toothing element 76 dfor a rotational drive of the further cooling unit 18 d, in particular of the cooling fluid flow generating element 22 dof the further cooling unit 18 d. The cooling unit 14 dis arranged in a first cooling fluid channel of the machine tool cooling device 10 d. The further cooling unit 18 dis arranged in a further cooling fluid channel of the machine tool cooling device 10 d. The first cooling fluid channel and the further cooling fluid channel are arranged spatially separated from one another in the housing unit 38 d. With regard to further features and functions of the power tool cooling device 10 dillustrated in FIG. 5, reference may be made to the description of the power tool cooling device 10 adescribed in FIGS. 1 and 2.FIG. 6 shows an alternative portable power tool 12 ehaving an alternative power tool cooling device 10 ethat comprises at least one cooling unit 14 ewhich generates a cooling fluid flow at least for cooling a drive unit 16 eof the portable power tool 12 eand at least one further cooling unit 18 efor generating a further cooling fluid flow, which cooling unit is configured differently from the cooling unit 14 efor cooling the drive unit 16 e. The portable power tool 12 eillustrated in FIG. 6 has an at least substantially analogous configuration to the portable power tool 12 bdescribed in FIG. 3. The power tool cooling device 10 eillustrated in FIG. 6 has an at least substantially analogous configuration to the power tool cooling device 10 billustrated in FIG. 3. In contrast to the power tool cooling device 10 billustrated in FIG. 3, the power tool cooling device 10 eillustrated in FIG. 6 has the further cooling unit 18 ewhich is formed at least partially integrally with the electronics unit 34 efor cooling an electronics unit 34 eof the portable power tool 12 e. In this case, the electronics unit 34 ecomprises at least one cooling unit drive unit 80 ewhich is provided for driving the further cooling unit 18 e. The cooling unit driving unit 80 eis formed separately from the driving unit 16 eof the portable machine tool 12 e. Here, the cooling unit driving unit 80 eis formed as an electric motor unit. However, it is also conceivable for the cooling unit drive unit 80 eto have a different configuration that appears expedient to a person skilled in the art. A cooling fluid flow generating element 22 eof the further cooling unit 18 eis arranged in a rotationally fixed manner with a drive element 82 eof the cooling unit drive unit 80 e. The cooling fluid flow generating element 22 eof the further cooling unit 18 eis designed as a fan wheel. Here, the cooling fluid flow generating element 22 eof the further cooling unit 18 eis drivable in rotation by means of the cooling unit drive unit 80 e.The cooling unit 14 e, in particular a cooling fluid flow generating element 20 eof the cooling unit 14 e, has an axis of rotation 24 ewhich is arranged at least substantially parallel offset to an axis of rotation 32 eof the further cooling unit 18 e, in particular of the cooling fluid flow generating element 22 eof the further cooling unit 18 e. Thus, the cooling unit 14 eis arranged in the housing unit 38 eat a distance relative to the further cooling unit 18 e. With regard to further features and functions of the power tool cooling device 10 eillustrated in FIG. 6, reference may be made to the description of the power tool cooling device 10 adescribed in FIGS. 1 and 2.FIG. 7 shows an alternative portable power tool 12 fhaving an alternative power tool cooling device 10 f, which comprises at least one cooling unit 14 fwhich generates a cooling fluid flow at least for cooling a drive unit 16 fof the portable power tool 12 fand at least one further cooling unit 18 ffor generating a further cooling fluid flow, which cooling unit is configured differently from the cooling unit 14 ffor cooling the drive unit 16 f. The portable power tool 12 eillustrated in FIG. 7 has an at least substantially analogous configuration to the portable power tool 12 bdescribed in FIG. 3. The power tool cooling device 10 fillustrated in FIG. 7 has an at least substantially analogous configuration to the power tool cooling device 10 eillustrated in FIG. 6. In contrast to the power-tool cooling device 10 eillustrated in FIG. 6, the power-tool cooling device 10 fillustrated in FIG. 7 has the cooling unit 14 f, which has an axis of rotation 24 farranged at least substantially transversely with respect to an axis of rotation 32 fof the further cooling unit 18 f. Furthermore, the machine tool cooling device 10 fcomprises at least one additional cooling unit 84 fwhich is provided for generating a cooling fluid flow. The additional cooling unit 84 fis formed separately from the cooling unit 14 fand the further cooling unit 18 f. The additional cooling unit 84 fis integrated into a further electronic unit 36 fof the portable machine tool 12 f. In this case, the additional cooling unit 84 fis designed as a fan wheel unit. However, it is also conceivable for the additional cooling unit 84 fto have a different configuration that appears expedient to a person skilled in the art. The further electronic unit 36 fof the portable machine tool 12 fis arranged in a main handle 40 fof the portable machine tool 12 f. Thus, at least one air inlet portion 60 fof a housing unit 38 fof the portable machine tool 12 fis disposed in the main handle 40 f. An air outlet portion 70 fof the housing unit 38 fis connected to the air inlet portion 60 fby means of a first cooling fluid passage of the machine tool cooling device 10 f. In this case, at least the further cooling unit 18 fand the additional cooling unit 84 fare arranged in the first cooling fluid channel. The additional cooling unit 84 fis provided to convey ambient air through air inlet openings 62 fof the air inlet region 60 finto the housing unit 38 f. The further cooling unit 18 fis provided for the purpose of conveying the ambient air conveyed into the housing unit 38 fby means of the additional cooling unit 84 fout of the housing unit 38 fthrough air outlet openings 72 fof the air outlet region 70 f. With regard to further features and functions of the power tool cooling device 10 fillustrated in FIG. 7, reference may be made to the description of the power tool cooling device 10 adescribed in FIGS. 1 and 2.

Claims

Portable power tool having a power tool cooling device which has at least one cooling unit (14a; 14b; 14c; 14d; 14e; 14f) which generates a cooling fluid flow at least for cooling a drive unit (16a; 16b; 16c; 16d; 16e; 16f) of the portable power tool, wherein at least one further cooling unit (18a; 18b; 18c; 18d; 18e; 18f) is provided for generating a further cooling fluid flow which is configured differently from the cooling unit (14a; 14b; 14c; 14d; 14e; 14f) for cooling the drive unit (16a; 16b; 16c; 16d; 16e; 16f), characterized in that the cooling unit (14b; 14c; 14d; 14e) has an axis of rotation (24b; 24c; 24d; 24e), which is arranged at least substantially parallel offset to a rotation axis (32b; 32c; 32d; 32e) of the further cooling unit (18b; 18c; 18d; 18e).Portable machine tool according to Claim 1, characterized in that the cooling unit (14a; 14b; 14c; 14d; 14e; 14f) has at least one cooling fluid flow-generating element (20a; 20b; 20c; 20d; 20e; 20f) which is formed separately from a cooling fluid flow-generating element (22a; 22b; 22c; 22d; 22e; 22f) of the further cooling unit (18a; 18b; 18c; 18d; 18e; 18f).Portable machine tool according to one of the preceding claims, characterized in that the cooling unit (14a; 14c; 14e; 14f) has at least one cooling fluid flow generating element (20a; 20c; 20e; 20f) which, viewed along an axis of rotation (24a; 24c; 24e; 24f) of the cooling unit (14a; 14c; 14e; 14f), is arranged relatively spaced apart from a cooling fluid flow generating element (22a; 22c; 22e; 22f) of the further cooling unit (18a; 18c; 18e; 18f).Portable machine tool according to one of the preceding claims, characterized in that the cooling unit (14a; 14b; 14c; 14d) and the further cooling unit (18a; 18b; 18c; 18d) can be driven by means of the drive unit (16a; 16b; 16c; 16d).Portable machine tool according to one of the preceding claims, characterized byat least one drive force transmission unit (26b; 26c; 26d) which is provided for the purpose of connecting the cooling unit (14a; 14b; 14c; 14d) to the further cooling unit (18a; 18b; 18c; 18d) in terms of drive technology.Portable power tool according to Claim 5, characterized in that the drive force transmission unit (26c; 26d) has at least one toothing (28c; 28d) for a drive connection of the cooling unit (14c; 14d) to the further cooling unit (18c; 18d).Portable power tool at least according to Claim 5, characterized in that the drive force transmission unit (26b) has at least one wrap-around element (30b) for a drive connection of the cooling unit (14b) to the further cooling unit (18b).Portable power tool according to one of the preceding claims, characterized in that the further cooling unit (18e; 18f) is at least partially formed integrally with the electronics unit (34e; 34f, 36f) for cooling an electronics unit (34e; 34f, 36f) of the portable power tool.Portable machine tool according to one of the preceding claims, characterized byat least one housing unit (38a; 38b; 38c; 38d; 38e; 38f) on which at least the cooling unit (14a; 14b; 14c; 14d; 14e; 14f) and the further cooling unit (18a; 18b; 18c; 18d; 18e; 18f) are arranged.Portable machine tool according to claim 9, characterised in that the housing unit (38a) comprises at least one air inlet region (60a) which is associated with at least the further cooling unit (18a) and at least one further air inlet region (68a) which is associated with at least the cooling unit (14a).Portable power tool according to Claim 10, characterized in that the air inlet region (60a) and the further air inlet region (68a) are connected to one another by means of at least one cooling fluid duct of the housing unit (38a).

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