Hand tool machine housing device and hand tool machine therewith

Abstract

Hand tool housing device, in particular electric chainsaw housing device, with at least one housing element (12) made of a metallic material, which has at least one drive unit bearing area (14) for receiving a drive unit (16) of a hand tool and for supporting bearing forces of the drive unit (16), and with at least one further housing element (34) which comprises at least one cover area (36) for at least partially covering the housing element (12), wherein the housing element (12) has at least one accumulator receiving area (20) which is provided for receiving at least one accumulator unit (22) for supplying power to the drive unit (16), characterized by at least one insulating element (32) for at least electrical insulation of the drive unit bearing area (14) from at least the further housing element (34).

Description

State of the art

[0001] From EP 1 961 528 B1, a hand-held power tool housing device, in particular an electric chain saw housing device, is already known, which comprises a housing element formed from a metallic material, which has a drive unit bearing region for receiving a drive unit of a hand-held power tool and for supporting bearing forces of the drive unit.

[0002] Furthermore, reference is made to the documents DE 196 17 157 A1, EP 2 286 970 A1, WO 01 / 03 231 A1, US 2011 / 0 308 831 A1, US 2011 / 0 162 219 A1, CN 1 02 972 216 A.

[0003] Based on the prior art, it is an object of the invention to provide a hand-held power tool housing device with improved properties with regard to operational reliability, as well as a hand-held power tool therewith. Disclosure of the invention

[0004] The invention relates to a hand-held power tool housing device having the features of claim 1 and a hand-held power tool having the features of claim 8. Advantageous further developments emerge from the dependent claims.

[0005] Particularly preferably, at least one battery holding unit of the handheld power tool can be arranged on the battery receiving area, which battery holding unit fixes the battery unit in a manner fixed to the battery receiving area. The battery unit comprises at least one holding element, in particular at least one locking element, which is intended to fix the battery unit to the battery receiving area by means of a positive and / or non-positive connection. Thus, the battery holding unit of the handheld power tool, which comprises the handheld power tool housing device, is arranged to fix the battery unit to the battery receiving area, in particular is integrated into the battery receiving area.The handheld power tool housing device preferably comprises at least one battery guide element arranged in the battery receiving area, which is intended to guide the battery unit during a connection process to the battery receiving area. "Provided" should be understood in particular to mean specially designed and / or specially equipped. The fact that an object is intended for a specific function should be understood in particular to mean that the object fulfills and / or performs this specific function in at least one application and / or operating state. The battery guide element is preferably formed integrally with the housing element. However, it is also conceivable for the battery guide element to be fixed to the housing element by means of a positive and / or non-positive connection.The term “one-piece” should be understood in particular as meaning at least materially connected, for example by a welding process, an adhesive process, an injection-molding process and / or another process that appears appropriate to the person skilled in the art, and / or advantageously formed in one piece, such as by production from a single casting and / or by production in a single-component or multi-component injection-molding process and advantageously from a single blank.

[0006] The expression "formed from a metallic material" is to be understood here in particular to mean that the housing element is formed from at least one material that comprises at least one metal component. In this case, the housing element is preferably formed from an at least substantially pure metallic material, such as magnesium, aluminum, etc., or the housing element is formed from an alloy that appears appropriate to a person skilled in the art, such as an aluminum alloy, a magnesium alloy, etc. In addition, the handheld power tool housing device preferably comprises at least one cooling fin arranged on the housing element. Particularly preferably, the handheld power tool housing device comprises a plurality of cooling fins arranged on the housing element. However, it is also conceivable for the handheld power tool housing device to be decoupled from the cooling fin(s).Alternatively or additionally, the hand-held power tool housing device preferably comprises a fluid cooling unit for cooling at least the drive unit.

[0007] The term "drive unit bearing region" is intended here, in particular, to define a region of the housing element that comprises at least one bearing point by means of which bearing forces of the drive unit can be supported. Preferably, the housing element comprises at least one bearing point in the drive unit bearing region, which is intended to accommodate at least one bearing element, in particular a ball bearing, of the drive unit. The bearing element can preferably be arranged in the bearing point by means of a press fit. By means of the design of the handheld power tool housing device according to the invention, a robust design can advantageously be realized, which is particularly advantageously insensitive to impacts. Furthermore, precise mounting of the drive unit in the metallic housing element can advantageously be enabled.Furthermore, the metallic housing element enables advantageous heat transfer to the environment surrounding the handheld power tool housing device. This advantageously eliminates the need for a fan unit. This leads to advantageously low production and / or assembly costs. Furthermore, eliminating the need for a fan unit for cooling the drive unit and / or the accumulator unit advantageously results in high energy efficiency for the handheld power tool comprising the handheld power tool housing device. Furthermore, advantageous heat transfer between the accumulator unit arranged in the accumulator receiving area and the metallic housing element can be enabled. This advantageously allows the accumulator unit to be operated over a long period of time without overheating.

[0008] Furthermore, it is proposed that the housing element comprise at least one machining tool receiving region, which is intended to support bearing forces of a machining tool. A "machining tool receiving region" is to be understood here in particular as a region of the housing element on which drive forces act on the machining tool to drive the machining tool or on which fastening forces act on the machining tool to fasten the machining tool to the housing element. Preferably, the machining tool can be fastened, in particular detachably, to the housing element by means of a positive and / or non-positive connection. In this context, "detachable" is to be understood in particular as "non-destructively separable". The machining tool is preferably designed as a saw chain machining tool.By means of the inventive design, a precise arrangement or compliance with tolerances of the components and / or units relative to one another on the metallic housing element can advantageously be achieved, particularly under a wide range of operating and / or temperature conditions. This advantageously enables precise machining of workpieces. Furthermore, disruptive vibrations can be kept to a minimum. Thus, tight tolerance limits for mounting the drive unit, the accumulator unit, and / or the machining tool can be realized.

[0009] It is also proposed that the handheld power tool housing device comprise at least one electronics receptacle element for accommodating at least one control and / or regulating electronics unit, in particular of the handheld power tool, which electronics receptacle element is arranged axially relative to the drive unit bearing area. The electronics receptacle element preferably extends at least partially into a drive unit recess of the handheld power tool housing device. The term "control and / or regulating electronics unit" is to be understood in particular as a unit with at least one processor unit and with a memory unit as well as with an operating program stored in the memory unit for controlling and / or regulating the handheld power tool. The control and / or regulating electronics unit is preferably encapsulated with the electronics receptacle element.However, it is also conceivable for the control and / or regulating electronics to be fastened, in particular detachably fastened, to the electronics receptacle element by means of a positive and / or non-positive connection. The term "axially arranged" is intended here to define in particular an arrangement of an element, in particular the electronics receptacle element, on another element, in particular on an additional housing element connected to the metallic housing element, wherein a rotational axis of the drive unit intersects the element and the another element. Furthermore, further units and / or components of the handheld power tool, such as an oil pump unit, a cutting strand tensioning unit, a chain brake unit, a main handle, a bow handle, etc., are preferably arranged on the metallic housing element. This advantageously enables a precise arrangement of mechanical components of the handheld power tool.By means of the inventive design, a stable arrangement of the control and / or regulating electronics can be advantageously achieved. Furthermore, heat transfer from the control and / or regulating electronics to the metallic housing element can be advantageously achieved. This advantageously enables a long service life of the control and / or regulating electronics.

[0010] Furthermore, it is proposed that the at least one insulating element comprises at least an electrical insulation of the battery receiving area, and thus in particular of the housing element, from at least the further housing element. The insulating element is preferably made of a plastic. A design of the insulating element from a ceramic material or other materials deemed appropriate by a person skilled in the art is also conceivable. In this case, the insulating element is preferably arranged in a contact region of the housing element and the further housing element. The insulating element is preferably formed at least partially in one piece with the further housing element of the handheld power tool housing device. By means of the design according to the invention, an arrangement of the drive unit and the battery unit on the metallic housing element that is safe for an operator can be advantageously enabled.

[0011] The additional housing element can preferably be fastened, in particular detachably fastened, to the housing element or to the additional housing element by means of at least one fastening element of the handheld power tool housing device. The housing element preferably forms at least one housing shell, and the second housing element preferably forms at least one additional housing shell. This allows for an advantageous repair option to be provided in a structurally simple manner. Furthermore, reliable protection against the ingress of dirt into the drive unit bearing area can advantageously be achieved.

[0012] Advantageously, the additional housing element is made of a plastic. This advantageously allows for the realization of a lightweight handheld power tool housing device. Furthermore, the additional housing element can be produced cost-effectively, for example, by means of an injection molding process, etc.

[0013] It is also proposed that the handheld power tool housing device comprise at least one heat-conducting element with a thermal conductivity of at least 5 W / m*K, which is at least intended to enable heat transfer between the battery unit and the housing element when the battery unit is arranged in the battery receiving area. In particular, the heat-conducting element has a thermal conductivity of at least 15 W / m*K, advantageously of at least 100 W / m*K and particularly advantageously of at least 200 W / m*K. The heat-conducting element is preferably formed integrally with the metallic housing element. However, it is also conceivable for the heat-conducting element to be formed as a separate component that can be fixed, in particular releasably fixed, to the housing element by means of at least one fastening element of the handheld power tool housing device.The inventive design particularly advantageously enables heat transfer from the accumulator unit to the metallic housing element. This advantageously enables a long service life of the accumulator unit. Furthermore, operation of the accumulator unit in an optimal operating state can be advantageously achieved.

[0014] Furthermore, it is proposed that the housing element surrounds the drive unit along a circumferential direction extending around a rotational axis of the drive unit by more than 30% of a total circumferential extent of the drive unit. The circumferential direction preferably extends in a plane extending at least substantially perpendicular to the rotational axis. The term "substantially perpendicular" is intended here to define, in particular, an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, in particular viewed in a plane, enclose an angle of 90° and the angle has a maximum deviation of, in particular, less than 8°, advantageously less than 5°, and particularly advantageously less than 2°.In particular, the metallic housing element surrounds the drive unit in a state arranged in the drive unit bearing area along the circumferential direction by at least more than 40%, preferably by more than 60%, particularly preferably by more than 80% of the total extent of the drive unit. Preferably, the metallic housing element completely surrounds the drive unit in a state arranged in the drive unit bearing area along the circumferential direction. Thus, a particularly advantageous heat transfer from the drive unit to the metallic housing element can be achieved.

[0015] Furthermore, a handheld power tool, in particular an electric chain saw, with at least one handheld power tool housing device according to the invention is proposed. A "handheld power tool" is understood here to mean, in particular, a power tool, in particular a handheld power tool, that can be transported by an operator without a transport device. The handheld power tool has, in particular, a mass that is less than 40 kg, preferably less than 10 kg, and particularly preferably less than 5 kg. The handheld power tool is particularly preferably designed as an electric chain saw. However, it is also conceivable for the handheld power tool to have another design that would be deemed appropriate by a person skilled in the art, such as, for example, a design as a drill, a screwdriver, an electric saw, a rotary hammer and / or chisel hammer, etc.By means of the design according to the invention, a stable hand-held power tool can advantageously be made possible which is at least substantially independent of a wired power supply.

[0016] It is further proposed that the handheld power tool comprise at least one drive unit designed to drive a machining tool without a gear. “Gearless” is intended here to define, in particular, a configuration of the handheld power tool in which a drive element arranged on an output shaft, in particular an armature shaft, interacts with the machining tool to exert drive forces and / or drive torques. Thus, the drive unit is preferably designed as a direct drive unit. The drive unit is preferably designed as an electric motor unit. In this case, the electric motor unit is designed as an AC electric motor unit. In an alternative configuration, the drive unit is designed as an EC electric motor unit. This advantageously allows a high level of efficiency of the handheld power tool to be achieved. drawing

[0017] Further advantages will become apparent from the following description of the drawings. The drawing shows an exemplary embodiment of the invention.

[0018] They show: Fig. 1 a hand-held power tool according to the invention with a hand-held power tool housing device according to the invention in a schematic representation, Fig. 2 a sectional view of the hand tool according to the invention along a line II-II of Fig. 1 in a schematic representation and Fig. 3 a sectional view of the hand tool according to the invention along a line III-III of Fig. 2 in a schematic representation. Description of the embodiment

[0019] Fig. 1 shows a hand-held power tool 18 designed as an electric chain saw with a hand-held power tool housing device 10. The hand-held power tool 18 further comprises at least one drive unit 16, which is intended to drive a machining tool 26 without a gear. For this purpose, the drive unit 16 has a drive element 44 arranged on a drive shaft 42 of the drive unit 16 ( Fig. 2). The drive element 44 is designed as a drive pinion. In addition, the drive element 44 is connected in a rotationally fixed manner to the drive shaft 42. When the processing tool 26 is arranged on the handheld power tool 18, the drive element 44 engages in a drive recess 46 of a guide rail 48 of the processing tool 26. In this case, the drive element 44 is connected to the cutting strand in a manner already known to a person skilled in the art to drive a cutting strand (not shown in detail here) of the processing tool 26. The cutting strand is designed as a saw chain. The drive element 44 thus engages the cutting strand to drive the cutting strand. As a result of a drive by means of the drive element 44, the cutting strand is moved circumferentially along a circumference of the guide rail 48 in a manner already known to a person skilled in the art.The guide rail 48 extends along a main extension direction on a side of the handheld power tool housing device 10 facing away from a main handle 50 of the handheld power tool 18 beyond the handheld power tool housing device 10. Furthermore, the handheld power tool 18 has a switch-on device 52 arranged in the main handle 50 for starting the drive unit 16. The switch-on device 52 is electrically and / or electronically connected to control and / or regulating electronics 30 of the handheld power tool 18. Furthermore, the handheld power tool 26 has a bow handle 54 arranged on the handheld power tool housing device 10 and a kickback safety device 56 arranged in the region of the bow handle 54.

[0020] Fig. 2 shows a sectional view of the hand tool 26 along a line II-II of Fig. 1. The handheld power tool housing device 10 is designed as an electric chainsaw housing device. The handheld power tool housing device 10 comprises at least one housing element 12 made of a metallic material, which has at least one drive unit bearing region 14 for receiving the drive unit 16 of the handheld power tool 18 and for supporting bearing forces of the drive unit 16. The drive unit bearing region 14 of the housing element 12 comprises at least one bearing point 58 for supporting bearing forces of the drive unit 16. The bearing point 58 is provided to accommodate a bearing element 60 of the drive unit 16. The bearing element 60 is designed as a ball bearing that rotatably supports the drive shaft 42 in the housing element 12. The housing element 12 is designed as a housing shell. However, it is also conceivable for the housing element 12 to be designed as a housing pot.The housing element 12 surrounds the drive unit 16 along a circumferential direction extending around a rotation axis 40 of the drive unit 16 by more than 30% of a total circumferential extent of the drive unit 16.

[0021] The housing element 12 further comprises at least one accumulator receiving area 20, which is provided for receiving at least one accumulator unit 22 for supplying power to the drive unit 16. The handheld power tool 18 and the accumulator unit 22 form a handheld power tool system. The accumulator receiving area 20 is arranged on a side of the housing element 12 facing away from the processing tool 26. In addition, the accumulator receiving area 20 is connected to the main handle 50. For this purpose, the housing element 12 comprises a receiving element 62 in the accumulator receiving area 20, on which a tab of the main handle 50 can be arranged ( Fig. 3). The main handle 50 can be fixed to the housing element 12 by means of a positive and / or non-positive connection.

[0022] The handheld power tool housing device 10 further comprises at least one accumulator guide element 64, which is provided to guide the accumulator unit 22 during a connection process with the accumulator receiving area 20 ( Fig. 3). For this purpose, the battery guide element 64 is arranged in the battery receiving area 20 on the housing element 12. The battery guide element 64 is formed integrally with the housing element 12. Furthermore, the handheld power tool 18 comprises a battery holding unit 66, which is provided for releasably fastening the battery unit 22 to the housing element 12 when the battery unit 22 is arranged in the battery receiving area 20. For this purpose, the battery holding unit 66 is arranged in the battery receiving area 20 on the housing element 12. The battery holding unit 66 is designed as a battery locking unit, which is provided for releasably fastening the battery unit 22 to the housing element 12 by means of a positive and / or non-positive connection.

[0023] Furthermore, the housing element 12 comprises at least one machining tool receiving area 24, which is intended to support bearing forces of a machining tool 26. The machining tool 26 is fastened, in particular releasably fastened, to the housing element 12 by means of a machining tool fastening device 68 of the hand-held power tool 26 by means of a positive and / or non-positive connection. For this purpose, the machining tool fastening device 68 comprises at least one fastening bolt 70 arranged in the housing element 12 in a rotationally fixed manner. Furthermore, the machining tool fastening device 68 has a guide rail receiving element 72 arranged on the fastening bolt 70, on which the guide rail 48 can be arranged.To clamp the machining tool 26 to the housing element 12 in the machining tool receiving area 24, the machining tool fastening device 68 comprises at least one clamping element 74, by means of which the machining tool 26 can be fixed to the housing element 12 in a position relative to the housing element 12. Depending on the position of the machining tool 26 relative to the housing element 12, the cutting strand is also tensioned.

[0024] Furthermore, the handheld power tool housing device 10 comprises at least one electronics receiving element 28 for receiving at least the control and / or regulating electronics 30, which is arranged axially relative to the drive unit bearing area 14. In Fig.2 shows electrical line elements 78, which are arranged in an assembled state of the handheld power tool 26. The line elements 78 are provided, in particular, for electrically connecting the control and / or regulating electronics 30 to the switching-on device 52, the safety device 56, etc. The electronics receiving element 28 is provided to close the drive unit bearing area 14, viewed along a rotational axis 40 of the drive shaft 42 of the drive unit 16, on the machining tool receiving area 24. The electronics receiving element 28 is formed from a metallic material. Furthermore, the electronics receiving element 28 is fixed to at least the additional housing element 80 of the handheld power tool housing device 10 by means of at least one fastening element (not shown in detail here) of the handheld power tool housing device 10.The additional housing element 80 is formed from a metallic material. This allows for advantageous heat transfer between the electronics receiving element 28 and the additional housing element 80. The additional housing element 80 is connected to the housing element 12 on a side facing away from the machining tool receiving area 24. The additional housing element 80 is fastened, in particular releasably fastened, to the housing element 12 by means of at least one fastening element (not shown in detail here) of the handheld power tool housing device 10. The additional housing element 80 further has a further drive unit bearing area 82, which has a further bearing point 84. The further bearing point 84 is provided to accommodate a further bearing element 86 of the drive unit 16.The additional bearing element 86 is designed as a ball bearing that supports the drive shaft 42 for rotation in the additional housing element 80. The additional housing element 80 is designed as a housing shell. However, it is also conceivable for the additional housing element 80 to be designed as a housing cup.

[0025] Furthermore, the additional housing element 80 has a further accumulator receiving area 88, which is intended to accommodate the accumulator unit 22 for supplying energy to the drive unit 16. The further accumulator receiving area 88 has an at least substantially analogous design to the accumulator receiving area 20. Thus, in a state arranged on the accumulator receiving area 20 and the further accumulator receiving area 88, the accumulator unit 22 is arranged at least partially on the accumulator receiving area 20 of the housing element 12 and at least partially on the further accumulator receiving area 88 of the additional housing element 80. In an alternative design of the handheld power tool housing device 10, not shown in detail here, the housing element 12 and the additional housing element 80 are formed as a single piece.

[0026] Furthermore, the handheld power tool housing device 10 comprises at least one insulating element 32 at least for electrically insulating the battery receiving area 20, the additional battery receiving area 88, the additional drive unit bearing area 82 and / or the drive unit bearing area 14 from at least one additional housing element 34 of the handheld power tool housing device 10. The insulating element 32 is arranged in a connecting area between the housing element 12 / the additional housing element 80 and the additional housing element 34. However, it is also conceivable for the insulating element 32 to be formed integrally with the additional housing element 34. Furthermore, it is conceivable for the additional housing element 34 to be formed integrally with the main handle 50 and / or the bow handle 54. The additional housing element 34 is formed from a plastic.Here, the further housing element 34 is arranged on the additional housing element 80 on a side of the additional housing element 80 facing away from the housing element 12. The further housing element 34 is fastened, in particular releasably fastened, to the additional housing element 80 by means of at least one fastening element (not shown in detail here) of the handheld power tool housing device 10. The further housing element 34 is designed as a housing shell. Thus, the housing element 12, the further housing element 34, and the additional housing element 80, when connected to one another, enclose the drive unit 16. The further housing element 34 comprises at least one cover region 36 for at least partially covering the housing element 12 and / or the additional housing element 80.

[0027] Furthermore, the handheld power tool housing device 10 has at least one heat-conducting element 38 with a thermal conductivity of at least 5 W / m*K, which is at least intended to enable heat transfer between the battery unit 22 and the housing element 12 when the battery unit 22 is arranged on the battery receiving area 20. The heat-conducting element 38 is formed integrally with the housing element 12. The handheld power tool housing device 10 also has a further heat-conducting element 76 with a thermal conductivity of at least 5 W / m*K, which is at least intended to enable heat transfer between the battery unit 22 and the additional housing element 80 when the battery unit 22 is arranged on the further battery receiving area 88. The further heat-conducting element 76 is formed integrally with the additional housing element 80.By designing the housing element 12 and the additional housing element 80 from a metallic material, heat can be advantageously dissipated. Furthermore, the cover area 36 also allows for... Electrical insulation of an operator of the hand-held power tool 18 is possible thanks to the housing element 34 made of plastic.

Claims

[1] Hand-held power tool housing device, in particular an electric chain saw housing device, with at least one housing element (12) formed from a metallic material, which has at least one drive unit bearing area (14) for receiving a drive unit (16) of a hand-held power tool and for supporting bearing forces of the drive unit (16), and with at least one further housing element (34) which comprises at least one cover area (36) for at least partially covering the housing element (12), wherein the housing element (12) has at least one accumulator receiving area (20) which is provided for receiving at least one accumulator unit (22) for supplying energy to the drive unit (16), characterized by at least one insulation element (32) at least for electrically insulating the drive unit bearing area (14) from at least the further housing element (34). [2] Hand tool housing device according to claim 1, characterized by that the housing element (12) comprises at least one machining tool receiving area (24) which is intended to support bearing forces of a machining tool (26). [3] Hand tool housing device according to one of the preceding claims, characterized by at least one electronics receiving element (28) for receiving at least one control and / or regulating electronics unit (30), which is arranged axially relative to the drive unit bearing area (14). [4] Hand tool housing device according to one of the preceding claims, characterized by the at least one insulation element (32) at least for electrical insulation of the accumulator receiving area (20) from at least the further housing element (34). [5] Hand tool housing device according to one of the preceding claims, characterized bythat the further housing element (34) is formed from a plastic. [6] Hand tool housing device according to one of the preceding claims, characterized by at least one heat-conducting element (38) with a thermal conductivity of at least 5 W / m*K, which is provided at least to enable heat transfer between the accumulator unit (22) and the housing element (12) when the accumulator unit (22) is arranged on the accumulator receiving area (20). [7] Hand tool housing device according to one of the preceding claims, characterized by that the housing element (12) surrounds the drive unit (16) along a circumferential direction extending around a rotation axis (40) of the drive unit (16) by more than 30% of a total circumferential extent of the drive unit (16). [8] Hand-held power tool, in particular electric chain saw, with at least one hand-held power tool housing device according to one of the preceding claims. [9] Hand tool according to claim 8, characterized by at least the drive unit (16) which is intended to drive a machining tool (26) without a gear.

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