Hand-Held Power Tool, Fanless Storage Battery

Abstract

A hand-held power tool, in particular a hammer drill or a combination hammer, is disclosed. The hand-held power tool includes a tool housing which has a receiving recess designed to replaceably receive a storage battery or a power supply unit. The hand-held power tool has an electric drive motor with a cooling fan. The tool housing has a first vent portion which is located in the receiving recess and through which a volume flow generated by the cooling fan can be guided.

Claims

1.-11. (canceled)

12. A hand-held power tool, comprising: a tool housing which has a receiving recess, wherein a storage battery or a power supply unit is replaceably receivable in the receiving recess; and an electric drive motor with a cooling fan disposed within the tool housing; wherein the tool housing has a first vent portion which is disposed in the receiving recess and wherein a volume flow generated by the cooling fan is guidable through the first vent portion.

13. The hand-held power tool according to claim 12, wherein the hand-held power tool is a hammer drill or a combination hammer.

14. The hand-held power tool according to claim 12, wherein the volume flow is guidable through a storage battery disposed in the receiving recess.

15. The hand-held power tool according to claim 12, wherein the tool housing has a second vent portion, wherein the second vent portion is disposed outside of the receiving recess, and wherein the volume flow generated by the cooling fan is at least partially guidable through the second vent portion.

16. The hand-held power tool according to claim 15, further comprising a flow control means, wherein the volume flow generated by the cooling fan is distributable between the first vent portion and the second vent portion by the flow control means.

17. The hand-held power tool according to claim 16, wherein the flow control means is regulatable depending on a temperature value measured in a storage battery disposed in the receiving recess.

18. The hand-held power tool according to claim 16, wherein the flow control means is regulatable depending on at least one temperature value measured in the hand-held power tool.

19. The hand-held power tool according to claim 16, wherein the flow control means is a change-over flap that is actuatable by a control device, wherein the change-over flap closes the first vent portion in a first switch position and closes the second vent portion in a second switch position.

20. The hand-held power tool according to claim 19, wherein the change-over flap is settable in a third switch position between the first switch position and the second switch position.

21. The hand-held power tool according to claim 15, wherein the first vent portion and the second vent portion are each associated with a respective vent.

22. A fanless storage battery for a hand-held power tool, wherein the hand-held power tool has a receiving recess for replaceably receiving the fanless storage battery and an electric drive motor with a cooling fan, comprising: an inner ventilation channel that is open to an environment, wherein the fanless storage battery is force-coolable by a volume flow generated by the cooling fan of the hand-held power tool via the inner ventilation channel when the fanless storage battery is disposed in the receiving recess of the hand-held power tool.

23. A tool system, comprising: a hand-held power tool according to claim 12; and a fanless storage battery according to claim 22.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a schematic representation of a fanless storage battery according to the invention;

[0022] FIG. 2 is a schematic representation of a hand-held power tool according to the invention having the fanless storage battery according to a first embodiment;

[0023] FIG. 3 is a schematic representation of a hand-held power tool according to the invention having the fanless storage battery according to a second embodiment;

[0024] FIG. 4 is a schematic representation of a hand-held power tool according to the invention having the fanless storage battery according to a third embodiment with a change-over flap in a first switch position;

[0025] FIG. 5 is a schematic representation of a hand-held power tool according to the invention having the fanless storage battery according to the third embodiment with a change-over flap in a further switch position;

[0026] FIG. 6 is a schematic representation of a hand-held power tool according to the invention having the fanless storage battery according to the third embodiment with a change-over flap in a second switch position; and

[0027] FIG. 7 is a schematic representation of a hand-held power tool according to the invention having the fanless storage battery according to a fourth embodiment.

DETAILED DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 shows a fanless storage battery 200 according to the invention. The storage battery 200 is designed to be replaceably received without using a tool in a receiving recess 80 not shown (see FIG. 2), with a representation of fastening means being dispensed with in this case.

[0029] The storage battery 200 contains an inner ventilation channel 210 via which the storage battery 200 is force-cooled. The inner ventilation channel 210 runs between a front vent 211 and a rear vent 212 which are located on opposing front sides of the storage battery 200. The storage battery 200 as well as the cells and electronics, which are located inside the storage battery 200, can be cooled with the aid of the inner ventilation channel 210 or a ventilation flow guided through the ventilation channel 210. The cells and the electronics of the storage battery 200 are not shown in the figures. The storage battery 200 has an open surface through the front vent 211 and rear vent 212.

[0030] A first embodiment of a hand-held power tool 100 according to the invention in the form of a hammer drill is represented in FIG. 2. The hand-held power tool 100 in this case contains substantially one tool housing 90 which has a receiving recess 80 designed to replaceably receive a storage battery 200. The receiving recess 80 serves to replaceably receive the storage battery 200. An electric drive motor 70 having a cooling fan 60 as well as a control device 30 are further positioned in the tool housing 90. The drive motor 70 serves to generate a torque which is transferred via a gear mechanism to a tool. Neither the gear mechanism nor the tool is represented in the figures. The control device 30 serves to control and regulate the drive motor 70, a change-over flap 20 as well as a first and second slat arrangement 10a, 10b. The control device 30 is for this purpose connected via lines that are not shown to the drive motor 70, the change-over flap 20 and the slat arrangements 10a, 10b. The change-over flap 20 as well as the first and second slat arrangement 10a, 10b are described below in detail.

[0031] As is also visible in FIG. 2, the tool housing 90 contains a first vent portion 40. The first vent portion 40 substantially constitutes one opening into the tool housing 90 through which the cooling fan 60 can suction cooling air from the environment U. The first vent portion 40 is in this case arranged towards the receiving recess 80 such that the front vent 211 of the storage battery 200 rests on the vent portion 40 when the storage battery 200 is connected to the hand-held power tool 100 in the receiving recess 80. A volume flow, which is suctioned by the cooling fan 60 inside the hand-held power tool 100 from the environment U, can flow through the storage battery 200 with the aid of the previously described inner ventilation channel 210 in order to cool the storage battery. The volume flow V in this case enters through the rear vent 212 into the storage battery 200, crosses the ventilation channel 210, enters through the front vent 211 from the storage battery 200 and enters through the first vent portion 40 into the tool housing 90. The storage battery 200 is thus cooled by the volume flow V of the cooling fan 60.

[0032] FIG. 3 shows a second embodiment of the hand-held power tool 100 according to the invention which is substantially identical to the first embodiment. Unlike the first embodiment, the tool housing 90 contains a second vent portion 50 in addition to the first vent portion 40. As is visible in FIG. 3, the first vent portion 40 and the second vent portion 50 are associated with vents that are different to each other which are located perpendicular to each other on the tool housing 90. The second vent portion 50, like the first vent portion 40, constitutes an opening into the tool housing 90 through which a volume flow V generated by the cooling fan 60 can be suctioned from the environment U into the inside of the hand-held power tool 100. In this case, a first volume flow V1 is suctioned through the first vent portion 40 and a second volume flow V2 is suctioned through the second vent portion 50. According to the second embodiment, in relation to the first embodiment, separate cooling in the form of the volume flow V2 is provided for the drive motor 70 through the second vent portion 50 which is not guided through the storage battery 200 and consequently is also not heated by the storage battery 200.

[0033] FIGS. 4, 5 and 6 show the hand-held power tool 100 according to the invention according to a third embodiment. The hand-held power tool 100 according to the third embodiment is substantially identical to the hand-held power tool 100 according to the second embodiment. Unlike the hand-held power tool 100 according to the second embodiment, the hand-held power tool 100 according to the third embodiment, also contains a flow control means which is configured to distribute the volume flow V generated by the cooling fan 60 between the first vent portion 40 and the second vent portion 50. As represented in FIGS. 4, 5 and 6, the flow control means is configured in the form of a change-over flap 20. The change-over flap 20 is in this case located in the tool housing 90 such that it can be pivoted continuously and reversibly between a first switch position 20A and a second switch position 20B. The change-over flap 20 can also be set in a middle switch position 20M between the first switch position 20A and the second switch position 20B.

[0034] FIG. 4 shows the change-over flap 20 in the first switch position 20A in which the change-over flap 20 completely closes the second vent portion 50 such that no cooling air can be suctioned from the environment U through the second vent portion 50 into the inside of the tool housing 90. At the same time, the first vent portion 40 is completely closed so that the volume flow V is suctioned only through the first vent portion 40 into the inside of the tool housing 90. The storage battery 200 thereby experiences maximum cooling. The change-over flap 20 is horizontal for this purpose.

[0035] FIG. 5 shows the change-over flap 20 in the middle switch position 20M in which the first vent portion 40 and the second vent portion 50 are partially open. In the middle switch position 20M cooling air can flow both in the form of a volume flow V1 through the first vent portion 40 and in the form of a volume flow V2 through the second vent portion 50.

[0036] FIG. 6 shows the change-over flap 20 in the second switch position 20B in which the change-over flap 20 completely closes the first vent portion 40 such that no cooling air can be suctioned from the environment U through the first vent portion 40 into the inside of the tool housing 90. At the same time, the second vent portion 50 is completely open such that the volume flow V is suctioned only through the second vent portion 50 into the inside of the tool housing 90. The storage battery 200 thereby experiences no cooling in the form of cooling air flowing through the inner ventilation channel 210. The drive motor 70, in contrast, experiences maximum cooling.

[0037] The switch position of the change-over flap 20 is controlled and regulated by means of the control device 30. The control device 30 is connected to a first temperature sensor and a second temperature sensor. The first temperature sensor is in this case positioned such that it measures the temperature of the storage battery 200. The second temperature sensor is, in contrast, positioned such that it measures the temperature of the drive motor. The temperature data measured by the respective temperature sensors are sent to the control device 30. The control device 30 can determine whether an excessively high and therefore critical temperature has been reached for the storage battery 200 and/or the drive motor 70 by way of a comparison with reference temperature values stored in the control device 30. If the measured temperature value indicates a storage battery 200 that is too warm, the control device 30 sends a corresponding signal to the change-over flap 20 such that the change-over flap 20 either opens further (i.e. the change-over flap 20 moves in the direction R) or completely pivots into the first switch position 20A. However, if the measured temperature value indicates a drive motor 70 that is too warm, the control device 30 sends a corresponding signal to the change-over flap 20 such that the change-over flap 20 either opens further (i.e. the change-over flap 20 moves in the direction R′) or completely pivots into the second switch position 20B. If the measured temperature values indicate simultaneous heating of the storage battery 200 and the drive motor 70, the control device 30 adjusts the change-over flap 20 to a middle switch position 20M such that both the storage battery 200 and the drive motor 70 are correspondingly cooled. In this case, it should be noted that the control device 30 can adjust the change-over flap 20 to any possible switch position between the first switch position 20A and the second switch position 20B.

[0038] The first temperature sensor and the second temperature sensor are not represented in the figures. Likewise, the connections from the control device 30 to the change-over flap 20 or to the temperature sensors are also not represented.

[0039] FIG. 7 shows the hand-held power tool 100 according to the invention according to a fourth embodiment. The hand-held power tool 100 according to the fourth embodiment is substantially identical to the hand-held power tool 100 according to the third embodiment. Unlike the hand-held power tool 100 according to the third embodiment, the flow control means is configured in the form of a first slat arrangement 300 and a second slat arrangement 400. The first slat arrangement 300 is in this case positioned on the first vent portion 40 and the second slat arrangement 400 is positioned on the second vent portion 50. Depending on the position of the first slat arrangement 300, the first vent portion 40 can either be completely opened, partially closed or completely closed. The first slat arrangement 300 and the second slat arrangement 400 can for this purpose be reversibly pivoted in the direction of the arrows in FIG. 7. Accordingly, depending on the position of the second slat arrangement 400, the second vent portion 50 can either be completely opened, partially closed or completely closed. The first and second slat arrangement 300, 400 is shown in FIG. 7 in a partially closed position. The position of the slat arrangement 300, 400 for this purpose serves to increase or reduce the respective volume flow through the first vent potion 40 and the second vent portion 50.

[0040] The slat arrangements 300, 400 are connected to the control device 30 such that (as already described above with respect to the third embodiment) the control device 30 either further opens or closes the slat arrangements 300, 400 corresponding to the respectively measured temperature value in the storage battery 200 or in the drive motor 70.

LIST OF REFERENCE NUMERALS

[0041] V volume flow

[0042] U environment

[0043] 20 change-over flap

[0044] 20A first switch position

[0045] 20M middle switch position

[0046] 20B second switch position

[0047] 30 control device

[0048] 40 first vent portion

[0049] 50 second vent portion

[0050] 60 cooling fan

[0051] 70 electric drive motor

[0052] 80 receiving recess

[0053] 90 tool housing

[0054] 100 hand-held power tool

[0055] 200 storage battery

[0056] 210 ventilation channel

[0057] 211 front vent

[0058] 212 rear vent

[0059] 300 first slat arrangement

[0060] 400 second slat arrangement

[0061] 500 tool system