POWER TOOL WITH A SPECIFIC OUTPUT CURRENT

Abstract

A power tool having a motor and an energy supply device, wherein an output current from the energy supply device to the power tool is greater than or equal to 70 amperes. The power-to-weight ratio of the power tool is in a range of greater than or equal to 0.30 kW/kg, for example. In addition, a power-to-weight ratio L of the power tool can preferably be in a range of greater than or equal to 0.30 kW/kg. In addition, a contact system for transmitting electrical energy from the energy supply device to the power tool is disclosed, wherein the contact system has at least one first contact and at least one second contact, wherein a contact area between the two contacts has a size of greater than or equal to 20 mm.sup.2.

Claims

1-15: (canceled)

16: A power tool comprising: a motor; and an energy supply device, an output current from the energy supply device to the power tool being greater than or equal to 70 amperes.

17: The power tool as recited in claim 1 wherein the energy supply device includes at least one rechargeable battery.

18: The power tool as recited in claim 17 wherein the rechargeable battery of the energy supply device has a rated voltage in a range from 20 to 25 V.

19: The power tool as recited in claim 17 wherein the rechargeable battery of the energy supply device has a rated voltage in a range from 21 to 23 V.

20: The power tool as recited in claim 17 wherein the rechargeable battery of the energy supply device has a rated voltage in a range from 21.5 to 22 V.

21: The power tool as recited in claim 17 wherein the rechargeable battery of the power tool has two positive contacts and two negative contacts.

22: The power tool as recited in claim 16 further comprising a contact system for transmitting electrical energy between the power tool and the energy supply device, wherein the contact system has at least one first contact and at least one second contact, wherein the first and second contacts have a contact cross-sectional area with a size of greater than or equal to 20 mm.sup.2.

23: The power tool as recited in claim 16 wherein a mass of the energy supply device is in a range from 1 to 2 kg.

24: The power tool as recited in claim 16 wherein a mass of the energy supply device is in a range from 1.2 to 1.5 kg.

25: The power tool as recited in claim 16 wherein a mass of the energy supply device is 1.25 kg.

26: The power tool as recited in claim 16 wherein a ratio of the mass of the energy supply device to the output power P of the motor of the power tool is in a range of less than or equal to 0.45 kg/kW.

27: The power tool as recited in claim 16 wherein a power-to-weight ratio of the power tool is in a range of greater than or equal to 0.30 kW/kg.

28: The power tool as recited in claim 16 wherein the power tool (1) has a disk-shaped tool.

29: The power tool as recited in claim 28 wherein a diameter of the disk-shaped tool is in a range from 250 to 450 mm.

30: The power tool as recited in claim 28 wherein a diameter of the disk-shaped tool is in a range from 270 to 400 mm.

31: The power tool as recited in claim 28 wherein a diameter of the disk-shaped tool is in a range from 290 to 350 mm.

32: The power tool as recited in claim 28 wherein a diameter of the disk-shaped tool is 300 mm.

33: The power tool as recited in claim 16 wherein a mass of the power tool is in a range from 6 to 12 kg.

34: The power tool as recited in claim 16 wherein a mass of the power tool is in a range from 8 to 10 kg.

35: The power tool as recited in claim 16 wherein a mass of the power tool is in a range from 8.3 to 9 kg.

36: The power tool as recited in claim 16 wherein a mass of the power tool is 8.6 kg.

37: The power tool as recited in claim 16 wherein an output power of the motor is in a range from 2 to 4 kW.

38: The power tool as recited in claim 16 wherein an output power of the motor is in a range from 2.5 to 3.3 kW.

39: The power tool as recited in claim 16 wherein an output power of the motor is 2.8 kW.

40: The power tool as recited in claim 16 wherein the motor has an outside diameter in a range of greater than or equal to 75 mm.

41: The power tool as recited in claim 16 wherein an efficiency of the power tool is in a range of greater than or equal to 0.70.

42: The power tool as recited in claim 16 wherein an efficiency of the power tool is in a range of greater than or equal to 0.75.

43: The power tool as recited in claim 16 wherein an intake power of the power tool is in a range from 2.5 to 4 kW.

44: The power tool as recited in claim 16 wherein an intake power of the power tool is in a range from 3 to 3.5 kW.

45: The power tool as recited in claim 16 wherein an intake power of the power tool is 3.2 kW.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Further advantages of the invention will become apparent from the following description of the figures. The figure, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.

[0030] Identical and similar components are denoted by the same reference signs in the figure, in which:

[0031] FIG. 1 shows a view of a preferred configuration of the power tool.

[0032] FIG. 2 shows a view of a preferred configuration of the contact system for transmitting electrical energy from the energy supply device to the power tool.

DETAILED DESCRIPTION

[0033] FIG. 1 shows a preferred configuration of the power tool 1. In particular, FIG. 1 shows a cut-off grinder 1 which comprises a motor 2. The motor 2 can be arranged between a cutting arm and an energy supply device 3. In particular, it can be a brushless electric motor, wherein the motor 2 has an outside diameter of greater than or equal to 75 mm, for example. The energy supply device 3 can comprise one, two or more rechargeable batteries, wherein the rechargeable battery or rechargeable batteries can be inserted into a receiving or battery compartment on a rear side of the power tool 1, for example. A total weight M2 of the energy supply device 3 can be 1.26 kg, for example. In the context of the invention, it is preferred for the energy supply device 3 having the rechargeable batteries to be present in a rear region of the power tool 1, in particular in spatial proximity to an underside of the main body of the power tool 1. A rechargeable battery 100 (shown solely schematically) of the energy supply device 3 of the power tool 1 preferably has two positive contacts and two negative contacts 101 (also shown solely schematically). This can advantageously make it possible to provide the particularly high output currents. If the energy supply device 3 has more than one rechargeable battery, it is preferred in the context of the invention for all rechargeable batteries of the power tool 1 to have two positive contacts and two negative contacts. However, it can also be preferred for only a subset of the rechargeable batteries to have two positive contacts and two negative contacts for transmitting the electrical energy. The positive contacts and negative contacts preferably form the interface between the energy supply device 3 and the power tool 1, wherein the task of the interface is to transmit the electrical energyfor example stored in the rechargeable batteriesfrom the energy supply device 3 to the power tool 1.

[0034] A tool 4 can be provided on the cutting arm of the power tool 1 and can preferably be disk-shaped. It can preferably be a cut-off or cutting blade. In the context of the invention, it is preferred for the tool 4 to have a diameter of 300 mm.

[0035] The motor 2 of the power tool 1 is preferably designed in such a way that the motor 2 can provide an input power of, for example, 3.3 KW and an output power P of approximately 2.8 KW. The power-to-weight ratio L of the power tool 1 illustrated in FIG. 1 is in a range of greater than or equal to 0.30 kW/kg, wherein the power-to-weight ratio L is formed by a quotient of the output power P of the motor 2 and the mass M1 of the power tool 1. In addition, a ratio of the mass of the energy supply device 3 of the power tool 1 to the output power of the motor 2 of the power tool 1 can be in a range of less than or equal to 0.45 kg/kW.

[0036] The invention provides for an output current from the energy supply device 3 in the direction of the power tool 1 to be greater than or equal to 70 A. For example, this intake current of the power tool 1 or its supply current can be 73 amperes.

[0037] FIG. 2 shows a preferred embodiment of the contact system 8 which can be used to transmit electrical energy from the energy supply device 3 to the power tool 1. The contact system 8 has two different groups of contacts which can be in the form of, for example, positive and negative poles or female contacts 7 and male contacts 6. The contacts 6, 7 have a contact region 9 or a contact cross-sectional area 9 with an area of greater than or equal to 20 mm.sup.2. For example, the male contacts 6 represent the group of second contacts, wherein these second contacts 6 are preferably present on the power tool 1 and are male. Analogously, the female contacts 7 can represent the group of first contacts, wherein these first contacts 7 are preferably present on the energy supply device 3 and are female. The first or the female contacts 7 are preferably present on the at least one rechargeable battery of the energy supply device 3 of the power tool 1.

LIST OF REFERENCE SIGNS

[0038] 1 Power tool [0039] 2 Motor [0040] 3 Energy supply device [0041] 4 Disk-shaped tool [0042] 5 Contact system [0043] 6 Male contact [0044] 7 Female contact [0045] 8 Contact system [0046] 9 Contact region, contact cross-sectional area