EP3227060B1 - Hand-held machine tool, fan-free power supply and tool system - Google Patents

Description

The present invention relates to a hand tool, in particular a hammer drill or combi hammer. The handheld power tool has a tool housing, which has a receptacle bay designed for interchangeable reception of a rechargeable battery or mains current part. The portable power tool also has an electric drive motor with a cooling fan and a first vent opening section arranged on the tool housing outside the receiving bay. By means of this first ventilation opening section, a volumetric flow generated by the cooling fan of the handheld power tool can be guided. In this way, the electric drive motor of the power tool, which develops heat during operation, can be cooled. Hand tool, in particular a rotary hammer or combi hammer, can be optionally supplied by an accumulator or a mains power supply with electrical energy when they are connected to the power tool. The power supply part has for this purpose a power cable, which establishes a connection to a mains power source (also called socket).

A conventional hand tool is in EP 0 940 864 A2 disclosed.

The present invention also relates to a fanless mains power supply for a hand tool, wherein the fanless mains power supply is designed for interchangeable recording within a receiving bay of a power tool.

Furthermore, the present invention relates to a tool system with a hand tool and a fanless mains power supply.

It is an object of the present invention to provide a hand tool, a mains power supply, and a tool system with improved cooling property.

With regard to the power tool, the object is achieved by the features of claim 1. Advantageously, a volume flow generated by the cooling fan of the handheld power tool can now be guided at least partially through the second ventilation opening section into the receiving bay and used there for cooling tasks.

In a preferred embodiment, the second ventilation opening section is provided such that a closed surface accumulator (tool accumulator of the prior art) accommodated in the reception bay closes the second ventilation opening section. Thus, a closed-surface accumulator accommodated in the receptacle can be force-cooled (by a volume flow generated by the cooling fan and passing through the first vent and the accumulator over the second vent portion).

Preferably, the first and / or the second vent opening section are open when the intake bay is empty to the ambient air. Particularly preferably, the receiving bay is designed for tool-less interchangeable receiving a battery or mains power supply.

It has proven to be advantageous if the first ventilation opening section is arranged on the housing such that a volumetric flow component produced by the cooling ventilator and passing through the first ventilation opening section flows axially to a ventilation axis of the cooling ventilator. The second ventilation opening section is preferably arranged on the housing in such a way that a volume flow component generated by the cooling fan and flowing through the second ventilation opening section flows transversely to the ventilation axis of the cooling ventilator. According to the invention, the handheld power tool has a flow control means which is designed to distribute a volume flow generated by the cooling fan between the first and second ventilation sections as a function of a rechargeable battery or mains current part to be accommodated in the receiving bay. A higher proportion of volumetric flow through the first vent opening section is associated with a battery operation, a higher volumetric flow rate through the second vent section with a power-split operation of the power tool. Preferably, the flow control means is designed as externally operable switchover. The externally actuable reversing flap can close the first vent opening section in a first switching position. Preferably, the flow control means designed as externally operable switchover flap can close the second vent opening section in a second switch position.

It has proven to be advantageous if the first ventilation opening section and the second ventilation opening section are associated with different ventilation openings. Alternatively, the first vent portion and the second vent portion belong to a same ventilation opening. Preferably, the first vent opening section and the second vent opening section are arranged substantially perpendicular to each other.

With regard to the fanless mains power part, the present task is solved by the features of claim 5.

The inner ventilation duct preferably extends between a front ventilation opening and a return ventilation opening of the mains power part. These can be arranged on opposite end faces of the mains power supply. Particularly preferably, the front ventilation opening is arranged on the mains power part such that when the mains power part is received in the receiving bay, the front ventilation opening is substantially congruent with the second ventilation opening section.

The invention includes the recognition that a volumetric flow generated by the cooling fan of a handheld power tool, in particular in the form of sucked cooling air, can be used to cool a mains power part designed for interchangeable reception in a receiving bay with an internal and open ventilation duct according to the invention. Thus, it is possible to dispense with an additional cooling fan in the mains power part, as a result of which a mains power part can be constructed in a particularly compact and cost-effective manner. This has the further advantage that a mains power supply can be made much more powerful with the same external dimensions. According to the invention, the fanless mains power supply part has a closure element which is designed to effect at least partial closure of a first ventilation opening section arranged outside the receiving bay of the handheld power tool when the fanless mains power supply is accommodated in the receiving bay. In this way, an increased proportion of the volume flow generated by the cooling fan can be passed through the second vent section and thus used for cooling.

The closure element may be formed as a cantilevered sealing plate which covers the first vent opening portion of the machine tool. In this way, a particularly simple and robust closure element can be provided. The locking element formed as a projecting sealing plate may have a rubber seal, which is arranged to surround and / or seal the first vent portion when the fanless power supply is received in the receptacle bay.

The closure element may be a push element, which is designed to switch a provided in the hand tool externally operable switching flap from a second to a first switching position. Preferably, a second, arranged within the receiving bay of the power tool vent section can be opened to the inner ventilation duct of the fan-less mains power supply, so that the fanless mains power supply via the second vent section is zwangssühlbar. The closure element may be formed, for example, as a push rod or push bar. Preferably, the pusher element is arranged and designed such that it engages in the housing of the power tool when the fanless mains power supply is received in the receiving bay. The fanless mains power supply can be designed for tool-less interchangeable recording in a receiving bay of a power tool.

With respect to the tooling system, the present object is achieved by a tooling system having a prescribed hand tooling machine and a fanless power supply portion as described above. Preferably, the tool system further comprises an accumulator, which is designed for interchangeable recording in a receiving bay of a hand tool.

Further advantages will become apparent from the following description of the figures. In the figures, various embodiments of the present invention are shown. The figures, the description and the claims contain numerous features in combination. The skilled person will conveniently consider the features individually and summarize meaningful further combinations.

In the figures, identical and similar components are numbered with the same reference numerals.

Fig. 1

eine schematische Darstellung eines Akkumulators gemäß des Standes der Technik;

Fig. 2

eine schematische Darstellung eines erfindungsgemäßen Netzstromteils;

Fig. 3

eine schematische Darstellung eines erfindungsgemäßen Werkzeugsystems mit einer Handwerkzeugmaschine und einem Akkumulator;

Fig. 4

eine schematische Darstellung eines weiteren Ausführungsbeispiels eines erfindungsgemäßen Werkzeugsystems;

Fig. 5

eine weitere schematische Darstellung des erfindungsgemäßen Werkzeugsystems aus Fig. 4;

Fig. 6

eine schematische Darstellung einer weiteren bevorzugten Ausführungsform eines erfindungsgemäßen Werkzeugsystems;

Fig. 7

eine weitere schematische Darstellung des Werkzeugsystems aus Fig. 6; und

Fig. 8

eine weitere schematische Darstellung des Werkzeugsystems aus Fig. 6.

Show it:

Fig. 1

a schematic representation of a rechargeable battery according to the prior art;

Fig. 2

a schematic representation of a power line part according to the invention;

Fig. 3

a schematic representation of a tool system according to the invention with a hand tool and an accumulator;

Fig. 4

a schematic representation of another embodiment of a tool system according to the invention;

Fig. 5

a further schematic representation of the tool system according to the invention Fig. 4 ;

Fig. 6

a schematic representation of another preferred embodiment of a tool system according to the invention;

Fig. 7

another schematic representation of the tool system Fig. 6 ; and

Fig. 8

another schematic representation of the tool system Fig. 6 ,

Embodiment:

Fig. 1 shows a prior art accumulator 200 having a closed surface. The accumulator 200 is designed for tool-less replaceable recording in a receiving bay, not shown, in the present case has been dispensed with a representation of fasteners.

A fanless power supply part 300 is in Fig. 2 shown in perspective and has an inner ventilation duct 310, via which the fanless power supply part 300 is forcibly cooled. How out Fig. 2 As can be seen, the inner ventilation channel 310 extends between a front ventilation opening 311 and a return ventilation opening 312, which are arranged on opposite end sides of the mains power part 300. In the intended use of the fanless power supply part 300, a sucked via a cooling fan, not shown, flow through the return vent 312 in the inner ventilation duct 310 to from the front vent 311, which is arranged on the front side of the fanless power supply part 300 and for contact with a second vent section a power tool, not shown, are determined out of the fanless power supply part 300 out.

A tool system 500 in Fig. 3 has a hand tool 100, in this case a hammer drill. The hand tool 100 has a tool housing 90, which has a receptacle 80 designed for interchangeable reception of a rechargeable battery 200. How out Fig. 3 As can be seen, the handheld power tool 100 has an electric drive motor 70 with a cooling fan 60. On the tool housing 90, a first ventilation opening section 50 is arranged outside of the receiving bay 80. A second vent opening portion 40 is disposed on the tool housing 90 such that the closed surface accumulator 200 accommodated in the receptacle bay 80 closes the second vent opening portion 40. In the present case, the first ventilation opening section 50 and the second ventilation opening section 40 are associated with mutually different ventilation openings, which are arranged perpendicular to one another on the tool housing 90.

In the present case, a volume flow V drawn in by the cooling fan 60 only flows through the first ventilation opening section 50, since the second ventilation opening section 40 is closed by the exchangeable closed-cell accumulator 200 received in the receiving bay 80. Advantageously, forced refrigeration of the accumulator 200 already results from the closed second vent opening section 40 through portions of the volumetric flow V flowing along the second Ventilation opening portion 40 past the accumulator 200, however, the accumulator 200 does not flow through.

An inventive tool system 500 in Fig. 4 has a hand tool 100, with respect to Fig. 3 Hand tool 100 described matches.

In Fig. 4 a fanless power supply part 300 according to the invention is shown, which is already in the vicinity of a receiving bay 80, but not yet completely absorbed in selbiger. The fanless power supply 300 of the Fig. 8 has a locking element designed as a projecting sealing plate 320, which is intended to cover the first vent opening section 50 of the machine tool 100. How out Fig. 4 As can be seen, the inner ventilation duct 310 extends between the front ventilation opening 311 and the return opening 312 of the fanless mains power part 300 Fig. 4 Further, the front ventilation opening 311 of the power supply part 300 is disposed on the power supply part 300 such that when the power supply part 300 is accommodated in the accommodation bay 80, the front ventilation opening 311 is congruent with the second ventilation opening part 40.

Fig. 5 shows the tooling system 500 Fig. 4 wherein the fanless power supply part 300 is now completely received in the receiving bay 80. The closing element of the fanless mains current part 300 designed as a projecting sealing plate 320 now completely covers the first vent opening section 50 of the tool housing 90, so that a volume flow V generated by the cooling fan 60 operated by the electric drive motor 70 can not pass through the first vent opening section 50 , Rather, the volume flow V flows completely through the second vent section 40, wherein an intake via the return vent 312 of the power supply part 300 takes place.

As in Fig. 5 indicated by the arrows in the region of the mains current part 300, the sucked volume flow flows through the inner ventilation duct 310 of the mains power part 300 in order to cool it. In the further course of the volume flow V flows through the second vent opening portion 40 in the tool housing 90 of the power tool to simultaneously be used for cooling the electric drive motor 70. The further course of the volume flow V is not shown for reasons of simplicity. Typically, a further ventilation opening is provided on the tool housing 90 in the upper region of the drill chuck, through which the volume flow V can escape from the housing.

Fig. 6 shows another embodiment of a tool system according to the invention 500. The hand tool 100 has a designed as externally operable switchover valve 20 flow control means. The flow control means embodied as externally actuable changeover flap 20 is designed to distribute a volume flow V generated by the cooling fan 60 between the first 50 and second vent section 40 as a function of a mains current part 300 to be accommodated in the receiving bay 80. In the second switching position 20N of the externally actuable changeover flap 20, the second vent opening section 40 is substantially fully closed.

Like also out Fig. 6 2, the fanless power supply part 300 has a closure element which is designed here as a thrust element 330 and which is designed to effect a closure of the first ventilation opening section 50 arranged outside the receiving bay 80 of the handheld power tool 100 when the fanless mains power part 300 is received in the receiving bay 80 , Since the fanless mains power supply 300 in Fig. 6 is not received in the receiving bay 80, the first vent portion 50 is not closed. The thrust element 330 of the fanless power supply part 300 is configured to engage in the tool housing 90 during insertion of the fanless power supply part 300 into the receiving bay 80 through the second vent opening section 40 and thus to move the externally actuable changeover door 20 out of its shown second switch position 20N.

In Fig. 7 It is now shown how the pusher element 330 acts on the externally actuable changeover flap 20. By moving further in the direction of the arrow, the externally actuable change-over flap 20 is folded in the direction of the first vent opening section 50 in order, as shown in FIG Fig. 8 shown to finally close.

In Fig. 8 the fanless power supply part 300 is now completely received in the receiving bay 80. The closure element designed as a thrust element 330 has completely switched over the externally actuable changeover flap 20 into a first switching position 20A, so that the first vent opening section 50 is completely closed and the second vent opening section 40 is completely opened. A volume flow V drawn in through the cooling fan 60 can now flow through the return vent 312 of the mains current part 300 into the inner ventilation duct 310 of the fanless mains current part 300 in order to cool it. In the further course, the volume flow V flows through the front ventilation opening 311 and the second ventilation opening section 40 aligned therewith into the tool housing 90. As long as the fanless mains power supply 300 in the receiving bay 80 is arranged, designed as a thrust element 330 closure element holds the externally operable switchover flap 20 in the in Fig. 8 shown first switching position 20A fixed.

LIST OF REFERENCE NUMBERS

V

flow

U

Surroundings

20

switching door

20A

first switching position

20N

second switch position

40

second vent section

50

first ventilation opening section

60

cooling fan

70

electric drive motor

80

receiving bay

90

tool housing

100

Hand tool

200

accumulator

300

Mains part

310

ventilation duct

311

Front vent

312

Rear vent

320

sealing plate

330

push element

500

Tooling system

Claims (8)

1. Hand machine tool (100), particularly drill hammer or combi-hammer, with a tool housing (90), which has a receiving bay (80) made to accommodate an accumulator (200) or mains power part (300) interchangeably, in which the hand machine tool (100) has an electrical drive motor (70) with a cooling fan (60) and a first ventilation opening section (50) arranged on the tool housing (90) outside the receiving bay (80), through which a volume flow (V) produced through the cooling fan (60) may be conducted,
   in which the tool housing (90) has a second ventilation opening section (40) that is different from the first ventilation opening section (50), which is arranged inside the receiving bay (80) and through which the volume flow (V) produced through the cooling fan (60) may be at least partly conducted,
   characterised in that the hand machine tool (100) has a flow control device, which is made to distribute a volume flow (V) produced through the cooling fan (60) between the first ventilation opening section (50) and the second (40) ventilation opening section depending on an accumulator (200) or mains power part (300) to be accommodated in the receiving bay (80), in which a higher volume flow part is allocated to accumulator operation of the hand machine tool (100) through the first ventilation opening section (50) and a higher volume flow part is allocated to mains power part operation through the second ventilation opening section.
2. Hand machine tool (100) according to claim 1,
   characterised in that the second ventilation opening section (40) is provided in such a way that an accumulator (200) accommodated in the receiving bay (80) closes the second ventilation opening section (40) with a closed surface.
3. Hand machine tool (100) according to claim 1,
   characterised in that the flow control device is made as a changeover flap (20) that may be operated from outside, which in a first switching position (20A) closes the first ventilation opening section (50) and in a second switching position (20N) closes the second ventilation opening section (40).
4. Hand machine tool (100) according to one of the previous claims,
   characterised in that the first ventilation opening section (50) and the second ventilation opening section (40) belong to ventilation openings that are different from each other.
5. Fanless mains power part (300) for a hand machine tool (100), which has a receiving bay (80) made to accommodate the mains power part (300) interchangeably and an electrical drive motor (70) with a cooling fan (60), in which the fanless mains power part (300) has an inner ventilation channel (310) open to the environment (U), through which the fanless mains power part (300) may be force-cooled by means of a volume flow (V) produced through the cooling fan (60) of the hand machine tool (100), if the fanless mains power part (300) is accommodated in the receiving bay (80) of the hand machine tool (100),
   characterised in that the fanless mains power part (300) has a closure element (320; 330), which is made to cause at least partial closure of a first ventilation opening section (50) arranged outside the receiving bay (80) of the hand machine tool (100), if the fanless mains power part (300) is accommodated in the receiving bay (80).
6. Fanless mains power part (300) according to claim 5,
   characterised in that the closure element is made as a projecting sealing plate (320), which covers the first ventilation opening section (50) of the machine tool (100).
7. Fanless mains power part (300) according to claim 5,
   characterised in that the closure element is a push element (330), which is made to switch over a changeover flap (20) that may be operated from outside provided in the hand machine tool (100) from a second switching position (20N) into a first (20A) switching position, so that a second ventilation opening section (40) arranged inside the receiving bay (80) of the hand machine tool (100) is opened to the inner ventilation channel (310) of the fanless mains power part (300) and the fanless mains power part (300) may be force-cooled through the second ventilation opening section (40).
8. Tool system (500) with a hand machine tool (100) according to one of claims 1 to 4 and a fanless mains power part (300) according to one of claims 5 to 7.

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