阅读说明：本技术 可充电电池上的错开的触点 (Staggered contacts on rechargeable batteries ) 是由 R·迈克斯纳 J·斯滕弗胡贝尔 于 2018-04-19 设计创作，主要内容包括：本发明涉及工具机,其包含具有至少一个第一和第二功率接收元件的接收设备以及与工具机可连接的能量供应单元、例如可充电电池,该能量供应单元具有连接装置,该连接装置包含至少一个第一和第二功率输出元件,其中,为了接收和保持连接装置而设计有接收设备,使得所述功率接收元件与所述功率输出元件为了建立电连接而能相互连接。不仅第一而且第二功率接收元件包含正极以及负极,并且不仅第一而且第二功率输出元件包含正极以及负极,使得在接收设备与连接装置相互连接时,相应地一个正极与一个负极连接,并且第一功率接收元件的正极与第二功率接收元件的正极以及第一功率接收元件的负极与第二功率接收元件的负极沿至少一个第一和第二方向相互具有距离地定位。(The invention relates to a power tool comprising a receiving device having at least one first and one second power receiving element, and an energy supply unit connectable to the power tool, for example a rechargeable battery, having a connecting device comprising at least one first and one second power output element, wherein the receiving device is designed to receive and hold the connecting device such that the power receiving element and the power output element can be connected to one another for establishing an electrical connection. The first and second power receiving elements comprise both a positive pole and a negative pole, and the first and second power output elements comprise both a positive pole and a negative pole, such that when the receiving device and the connecting device are connected to one another, respectively one positive pole is connected to one negative pole, and the positive pole of the first power receiving element and the positive pole of the second power receiving element and the negative pole of the first power receiving element and the negative pole of the second power receiving element are positioned at a distance from one another in at least one first and second direction.)

1. Machine tool (1), such as a drilling machine, comprising:

-a receiving device (6) having at least a first and a second power receiving element (10); and

-an energy supply unit (7), such as a rechargeable battery, connectable to the machine tool (1), having a connecting device (12), the connecting device (12) comprising at least a first and a second power output element (13, 15);

Wherein a receiving device (6) is designed for receiving and holding the connecting device (12) in such a way that the power receiving element (10) and the power output element (13, 15) can be connected to one another for establishing an electrical connection,

characterized in that not only the first but also the second power receiving element (10) comprises a positive and a negative pole (14, 24), and not only the first and the second power output element (13, 15) comprises a positive pole (23, 25) and a negative pole (27, 29), such that when the receiving device (6) and the connecting device (12) are connected to each other, respectively one positive pole is connected to one positive pole and one negative pole is connected to one negative pole, wherein the positive pole (23) of the first power output element (13) and the positive pole (25) of the second power output element (15), the positive pole of the first power receiving element and the positive pole of the second power receiving element, the negative pole (27) of the first power output element (13) and the negative pole (29) of the second power output element (15), and the negative pole (14) of the first power receiving element (10) and the negative pole (24) of the second power receiving element are connected in at least one first and second direction (X, respectively, Y) are located at a distance from each other.

2. Machine tool (1) according to claim 1, characterised in that the positive pole (23) of the first power output element (13) and the positive pole (25) of the second power output element (15), the positive pole of the first power receiving element (10) and the positive pole of the second power receiving element, the negative pole (27) of the first power output element (13) and the negative pole (29) of the second power output element (15) and the negative pole (14) of the first power receiving element (10) and the negative pole (24) of the second power receiving element are positioned at a distance from each other in at least one third direction (Z).

3. Machine tool (1) according to claim 1 or 2, characterised in that spring elements (50) are provided on the positive pole (23, 25) and the negative pole (27, 29) of the power output element (13, 15), respectively, said positive pole (23, 25) and negative pole (27, 29) being thereby movable in the first and second direction (W, Z) and relative to the positive pole and the negative pole of the power receiving element so that, when the power output element (13, 15) and the power receiving element (10) are connected to each other, a relative movement between the respective positive pole (23, 25) and negative pole (27, 29) of the power output element (13, 15) and the positive pole and negative pole of the power receiving element can be resisted.

Technical Field

The invention relates to a machine tool, for example a drilling machine, comprising a receiving device having at least one first and one second power receiving element, and an energy supply unit, for example a rechargeable battery, which can be connected to the machine tool and which has a connecting device comprising at least one first and one second power output element, wherein the receiving device is provided for receiving and holding the connecting device such that the power receiving element and the power output element can be connected to one another for establishing an electrical connection.

Background

Cordless power tools may be operated with rechargeable batteries for power. The rechargeable battery can be removed from the power tool in order to be able to recharge the rechargeable battery with current at the charging device.

Due to the continuous development of cell technology and rechargeable battery technology, cordless power tools with ever increasing power can be realized. In order to increase the power, it is imperative that more and more electrical energy or current is supplied by the rechargeable battery of the power tool. During this time, a large number of contact elements are used as an interface between the rechargeable battery and the machine tool in order to transfer electrical energy.

In order to keep the size or the range of the interface between the rechargeable battery and the machine tool as small and compact as possible, the individual contact elements are positioned as closely as possible next to each other on the interface. Due to the high energy flow or the high current flowing from the rechargeable battery to the machine tool via the contact element, an undesired warming of the contact element can result. This uncontrolled warming leads to an increased electrical resistance in the contact element and also to damage of the contact element.

In conventional rechargeable battery-operated machine tools, both the handling (handlabung) and the current-carrying capacity of the contact elements are thus impaired.

Disclosure of Invention

The objects of the invention are therefore: a power tool with an improved interface between a rechargeable battery and the power tool is provided, with which the aforementioned problems can be solved and an increased current-carrying capacity of the contact elements can be achieved.

This object is achieved by the subject matter of independent claim 1. Advantageous embodiments of the subject matter according to the invention are contained in the dependent claims.

The object is achieved in particular by a machine tool, for example a drilling machine, comprising a receiving device having at least one first and one second power receiving element, and an energy supply unit, for example a rechargeable battery, which is connectable to the machine tool and has a connecting device comprising at least one first and one second power output element, wherein the receiving device is provided for receiving and retaining the connecting device such that the power receiving element and the power output element can be connected to one another for establishing an electrical connection.

According to the invention, the following steps are set: the first and second power receiving elements comprise not only a positive pole and a negative pole, but also the first and second power output elements comprise a positive pole and a negative pole, such that when the receiving device and the connecting device are connected to each other, respectively one positive pole is connected to one positive pole and one negative pole is connected to one negative pole, wherein the positive pole of the first power output element and the positive pole of the second power output element, the positive pole of the first power receiving element and the positive pole of the second power receiving element, the negative pole of the first power output element and the negative pole of the second power output element, and the negative pole of the first power receiving element and the negative pole of the second power receiving element are positioned at a distance from each other in at least one first and second direction.

setting: the receiving device is designed to receive power and/or data or signals. The receiving device is thus a receiver for the electrical energy or current and data and signals transmitted from the energy supply unit to the power tool.

The large number of contact elements on the interface enables: when the rechargeable battery and the tool are connected to each other, an increased pressing force must be applied. The reason for this is that: in particular, the mechanical resistance of the contact elements is overcome when the contact elements are designed in the form of lugs with elastically deformable webs for receiving pin-like plugs.

According to an advantageous embodiment of the invention, it can therefore be provided that: the positive pole of the first power output element and the positive pole of the second power output element, the positive pole of the first power receiving element and the positive pole of the second power receiving element, the negative pole of the first power output element and the negative pole of the second power output element, and the negative pole of the first power receiving element and the negative pole of the second power receiving element are positioned at a distance from each other along at least one third direction. Improved heat removal from the power output element and the power receiving element can be achieved in a simple manner by means of the spacing between the individual power output elements and the power receiving element.

According to a further advantageous embodiment of the invention, it can be provided that: spring elements are provided on the positive and negative poles of the power output element, respectively, whereby said positive and negative poles are thereby movable in the first and second directions and relative to the positive and negative poles of the power receiving element, so that relative movement between the respective positive and negative poles of the power output element and the positive and negative poles of the power receiving element is resisted when the power output element and the power receiving element are interconnected. This makes it possible to reduce the relative movement between the respective positive and negative electrodes and thus to counteract vibration-induced wear on the positive and negative electrodes.

However, according to an alternative embodiment it is also possible: the spring element is designed as a component with an elastically deformable material. The material used here may be an elastomer. In this way, vibration-induced movements of the contact element can be counteracted in a simple manner in a plurality of directions, that is to say not only in a direction toward the receiving element or against the receiving element.

drawings

Further advantages are obtained from the following description of the figures. The figures illustrate different embodiments of the invention. The figures, description and claims contain a large number of combinations of features. The person skilled in the art suitably also focuses on the individual features individually and combines these features into meaningful further combinations.

In the drawings:

fig. 1 shows a side view of a machine tool according to the invention, in which a rechargeable battery connected to the machine tool is shown;

Fig. 2 shows a further side view of the power tool according to the invention, in which the rechargeable battery is shown removed from the power tool;

Fig. 3 shows a perspective view of a connection device of a rechargeable battery according to a first embodiment;

Fig. 4 shows a side view of a connection device of a rechargeable battery according to a first embodiment;

Fig. 5 shows a perspective view of a connection device of a rechargeable battery according to a second embodiment;

fig. 6 shows a side view of a connection device of a rechargeable battery according to a second embodiment.

Detailed Description

Fig. 1 and 2 show an exemplary embodiment of a power tool 1 according to the present invention.

The power tool 1 is designed here in the form of a drilling machine. However, it is also possible: the power tool 1 is a percussion drill, a circular saw or the like.

The power tool 1 shown in fig. 1 and 2 essentially comprises a housing 2, a tool holder 3 and a handle 4 with an activation switch 5. Furthermore, the power tool 1 comprises a receiving device 6 for an energy supply unit 7. As fig. 1 and 2 show, the energy supply unit 7 is designed as a rechargeable battery, also referred to as a rechargeable battery.

Fig. 1 shows a state in which the battery 7 is connected to the power tool 1. For this purpose, the battery 7 is pushed in the direction of arrow a onto the receiving device 6. As shown in fig. 2, the battery 7 can again be moved away from the receiving device 6 and thus away from the power tool 1 in the direction of arrow B.

The housing 2 has a first end 2a and a second end 2 b. The tool receiving portion 3 is positioned on the first end portion 2a of the housing 2. The tool receiver 3 serves to receive and releasably hold a tool 8. The tool 8 shown in fig. 1 and 2 is designed in the form of a drill bit.

The handle 4 includes an activation switch 5, a first end 4a and a second end 4 b. The start switch 5 is used to operate the power tool 1.

the first end 4a of the handle 4 is fastened to the second end 2b of the housing 2 and to the underside of the housing 2.

A receiving device 6 for an energy supply unit 7 designed as a rechargeable battery is positioned on the second end 4b of the handle 4. As shown in fig. 3 and 4, the receiving device 6 includes a first power receiving element 10 and a second power receiving element 20 and two data receiving elements. The two data receiving elements are positioned in the receiving device 6 between the first power receiving element 10 and the second power receiving element 20 and are thus positioned in the center of the receiving device 6. The figures only schematically depict the data receiving elements.

the first power receiving element 10 includes a positive electrode and a negative electrode 14, and the second power receiving element 20 includes a positive electrode and a negative electrode 24. The positive poles are arranged parallel to one another and offset one above the other and on a first side of the receiving device 6. The negative poles 14, 24 are likewise arranged parallel to one another and offset one above the other and on the second side of the receiving device 6. The positive and negative poles 22, 24 serve to establish an electrical connection and in fact to receive current from the battery 7 and to transmit it to the load in the power tool 1. The positive electrode is not shown in the drawing.

The energy supply unit 7 designed as a rechargeable battery essentially comprises a housing 11 in which a plurality of individual, interconnected energy storage cells, also referred to as rechargeable cells, are located. Electrical energy can be stored in the rechargeable battery 7 by means of a rechargeable battery cell. The rechargeable cells are not shown in the drawings.

On the upper end of the housing 11 a connecting device 12 is positioned. The connection means 12 comprise a first power output element 13 and a second power output element 15. As shown in fig. 3, the first power output element 13 is positioned above the second power output element 15 (that is to say against the arrow direction X).

The first power receiving element 13 includes a positive electrode 23 and a negative electrode 25, and the second power receiving element 15 includes a positive electrode 27 and a negative electrode 27. The positive poles 23, 27 are arranged parallel to one another and offset one above the other and on the first side 6a of the connecting device 12. The negative poles 25, 29 are likewise arranged parallel to one another and offset one above the other and on the second side 6b of the receiving device 6. The positive poles 23, 27 and the negative poles 25, 29 are likewise used to establish an electrical connection and, in fact, to carry current (or electrical energy) out of the rechargeable battery 7 to the power tool 1.

However, according to an alternative design, which is not shown, it is also possible: two or more power output elements 13, 15 having one or more positive electrodes 23, 27 and negative electrodes 25, 29, respectively, are included in the connection device 12.

it is noted here that: the number of power output elements 13, 15 corresponds to the number of power receiving elements 10. Between the two power output elements 13, 15 two data output elements 30, 40 are positioned (see fig. 3 and 4). The two data output elements 30, 40 are designed such that they can be connected to the two data receiving elements 30, 40 of the receiving device 6.

according to the first embodiment of the present invention, the positive electrode 23 of the first power output element 13 is arranged offset in the directions Z and X with respect to the positive electrode 27 of the second power output element 15.

Likewise, the negative pole 27 of the first power output element 13 is offset in the directions Z and X with respect to the negative pole 29 of the second power output element 15.

The power receiving element 10 of the receiving device 6 and the power output elements 13, 15 of the connecting means 12 can be releasably connected to each other again. The positive pole of the power receiving element is connected to the positive poles 23, 25 of the power output elements 13, 15 and the negative poles 14, 24 of the power receiving element 10 are connected to the negative poles 27, 29 of the power output elements 13, 15, so that electrical contact is established. The electrical energy (or current) stored in the rechargeable battery cells can be conducted from the rechargeable battery 7 to the receiving device 6 via the connection of the respective positive pole 23, 25 to the negative pole 14, 24, 27, 29. The electrical energy is then conducted to the electrical load in the power tool 1.

The offset arrangement of the positive poles 23, 25 and negative poles 27, 29 of the power output elements 13, 15 necessitates: the positive and negative electrodes 14 and 24 of the power receiving element 13 are also arranged offset from each other. It is noted here that: according to the exemplary embodiment illustrated in fig. 3 and 4, the section of the positive pole 23 of the first power receiving element 13 offset in the direction Z is also arranged identically to the section of the positive pole of the first power receiving element offset in the direction Z. Similarly, the path in which the negative electrode 27 of the first power receiving element 13 is shifted in the direction Z is also provided in the same manner as the path in which the negative electrode 14 of the first power receiving element 13 is shifted in the direction Z. Otherwise the corresponding poles cannot be connected to each other when the receiving device 6 and the connecting means 12 are assembled together.

Fig. 5 and 6 show a second exemplary embodiment, according to which the positive pole 23 of the first power output element 13 is offset in the directions Z, X and Y with respect to the positive pole 25 of the second power output element 15. Likewise, the negative pole 27 of the first power output element 13 is offset in the directions Z, X and Y with respect to the negative pole 29 of the second power output element 15. The positive and negative poles 14, 24 of the power receiving element 10 of the receiving device 6 are also offset in the directions Z, X and Y in a corresponding manner, so that when the receiving device 6 and the connecting arrangement 12 are assembled together, the positive and negative poles of the power receiving element 10 of the receiving device 6 are connected to the positive and negative poles 23, 25, 27, 29 of the power output elements 13, 15 of the connecting arrangement 12.

An electric motor for generating torque is positioned in the housing 2. The electric motor is thus an electrical consumer. The torque generated in the electric motor is transmitted to the tool holder 3 via the output shaft and the transmission. The tool 8 is rotated by means of the transmitted torque. The motor, the driven shaft and the transmission mechanism are not shown in the drawings.

According to another embodiment of the invention, it can be provided that: the respective positive pole 23, 25 and negative pole 27, 29 of the power output elements 13, 15 are each connected to a spring element 50. As is shown in particular in fig. 3 to 6, the spring element 50 is positioned in the direction Z behind the respective positive pole 23, 25 and negative pole 27, 29. The spring element 50 extends in the direction Z. As is shown in particular in fig. 4 and 6, the respective spring element 50 is positioned around the litz wire 60. One such litz wire 60 per anode 23, 25 and cathode 27, 29. Litz wire 60 is used to transfer electrical energy from the rechargeable cells to the respective positive 23, 25 and negative 27, 29 poles.

In addition, respective positive electrodes 23, 25 and negative electrodes 27, 29 are in the contact chamber. The respective spring element 50 is positioned in the contact chamber such that the respective spring force of the spring element 50 presses the positive pole 23, 25 and the negative pole 27, 29 against the direction Z. The contact chamber is not shown in the drawing.

Each of the positive electrodes 23, 25 and negative electrodes 27, 29 further comprises a first and a second contact patch. The contact strip is designed to be movable or flexible, so that the first contact strip can be reversibly pivoted in a first direction and the second contact strip in a further direction. The movability of the contact strip is used to receive the respective positive pole 23, 25 and negative pole 27, 29 of the power receiving element 13, 15 of the receiving device 12, so that each positive pole 23, 25 and each negative pole 27, 29 come into contact with each other when the rechargeable battery 7 is connected to the power tool 1 as intended (see fig. 1).

By means of the spring element 50, relative movements caused by vibrations (for example in the arrow directions a and B) can be compensated, which relative movements occur between the respective positive pole 23, 25 and negative pole 14, 24, 27, 29 when the machine tool 1 is in use.