WO2011033093A1

WO2011033093A1 - Portable power tool, in particular a battery operated portable power tool

Info

Publication number: WO2011033093A1
Application number: PCT/EP2010/063748
Authority: WO
Inventors: Hans-Martin Hanke
Original assignee: Hs-Technik Gmbh
Priority date: 2009-09-18
Filing date: 2010-09-17
Publication date: 2011-03-24
Also published as: DE102009042151A1

Abstract

The invention relates to a portable power tool having a drive unit that is connected to a power source for driving, an output unit and an angular gear for transferring a rotational movement and a torque from the drive unit, on which the torque is initiated, to the output unit, on which the torque is received, wherein the drive unit has a drive shaft (2) and the output unit has an output shaft (3) and wherein the angular gear is arranged in a housing unit (4) of the portable power tool, wherein the angular gear has a universal shaft transmission (1).

Description

description

Hand tool, in particular battery-powered

Hand tool

The present invention relates to a hand tool with a

Drive unit, which is connected to the drive with a power source, a

Output unit and a bevel gear for transmitting rotational movement and torque from the drive unit at which the torque is introduced, to the output unit at which the torque is removed, the drive unit having a drive shaft and the output unit having a drive shaft and wherein the angular gear in a Housing element of

Hand tool is arranged.

Hand tool machines are machine tools that can be worn or held freely movable during use by a single person. For this purpose, these have at least one, usually ergonomically shaped,

Gripping device on. Hand tool machines have an independent

Drive unit within a housing element. The drive unit is powered by an energy source. The energy source may be, for example, an electric motor, a compressed air device or an accumulator. Of the

Drive unit, a torque is introduced into the power tool and transmitted to an output unit. The output unit removes the torque and transfers it to a workpiece or the like.

In known hand tool machines, a gear angle between the drive unit and the output unit is provided for transmitting the rotational movement and the torque. That is, in such an angular gear, the rotational movement and the torque are transmitted via intermeshing gears. For example, a classic gear angular gear on two bevel gears, which engage in one rotation. The bevel gears allow a constant angular position between the drive shaft of the drive unit and the output shaft of the output unit. A disadvantage of such gear angle transmissions is that efficiency losses occur. Depending on the toothing, the torque transmission fluctuates considerably. To produce unterschied degrees between the axis of the drive shaft and the axis of the drive shaft, other gears and gears are required. Different gears in turn require different due to their different dimensions and position to each other

Housing elements. In order to obtain a bending angle change between the drive shaft and the output shaft, both a new housing element and a new gear angle transmission are required. This results in unnecessarily high costs, especially material and conversion costs. Another part of the night is that the gears of the pinion gear must be lubricated at regular time intervals in order to maintain their full functioning.

Hand tool machines with gear angle transmissions are also relatively noisy due to the intermeshing teeth of the gears.

The object of the invention is therefore to provide a hand tool, the disadvantages of the aforementioned hand tool with a

Cogwheel gearbox overcomes. In particular, a hand tool is to be created, which ensures low efficiency losses and a relatively constant torque transmission and additionally low

Has wear and can be operated relatively quiet.

This object (s) is / are inventively achieved by a hand tool with the features according to independent claim 1. Further features and details of the invention will become apparent from the dependent claims, the description and the accompanying drawings.

The object is achieved in a hand tool of the type mentioned fact that the bevel gear has a cardan shaft gear.

A hand tool machine having a drive unit which is connected to the drive with a power source, an output unit and a bevel gear for transmitting a rotational movement and a torque from the drive unit, at which the torque is introduced, to the output unit to which the

Torque is removed, wherein the drive unit has a Antriebsweil and the output unit has an output shaft and wherein the angular gear is arranged in a housing element of the power tool, and in which the angular gear has a cardan shaft gear has very little

Efficiency losses and a very high torque repeat accuracy. The torque introduced by the drive unit can be transmitted one-to-one to the output unit by means of such a cardan shaft transmission. The PTO transmission also has less wear than a

Gear angle gearbox on.

A cardan shaft gear is used inter alia for the transmission of torques in non-aligned axes of rotation and mutually moving units. The non-aligned axes of rotation are formed in the power tool by the drive shaft of the drive unit and the output shaft of the output unit. Furthermore, cardan shafts can be used for length compensation. A

PTO shaft may also be formed in two parts. So a first

Cardan shaft member axially movable in a hollow profile-shaped second

Be mounted drive shaft element.

In the light of the invention, hand tool machines are machine tools that can be operated manually, in particular by a single person. For this purpose, the hand tool machines on, in particular ergonomically shaped, handle device. Such hand tool machines also have an independent drive unit, which can convert the supplied energy from a rotational movement. As a drive unit is not in the light of the invention

considered human labor. The energy can be supplied externally, but also provided internally. The torque introduced by the drive unit is transmitted from the drive shaft to the cardan shaft gear. The propeller shaft transmission transmits the torque advantageously one to one on the output shaft of the output unit. The output unit removes the torque and transfers it to a workpiece or the like. The cardan shaft gear is embedded in a housing element of the power tool. The housing element protects the cardan shaft gear and also serves as attachment or storage of the propeller shaft drive.

Another advantage of such a hand tool machine, which has a PTO gearbox as an angle gear, is that one and the same PTO gearbox can be used for different bending angles. That is, the same cardan shaft gear may be used to set another bend angle. This is only to be arranged in another housing element. The conversion of the power tool therefore requires only a new housing element, which for fixing the propeller shaft drive or the drive and

Output unit is used. The fact that the propeller shaft transmission is flexible, this can be used in a variety of hand tool, i. in

Hand tool, which have a different flexion angle between the axis of the drive shaft and the axis of the output shaft can be used. The housing element forms, together with the articulated shaft gearbox mounted in the housing element, the so-called shaft joint head of FIG

Hand tool. This shaft joint head can by the flexible

Cardan shaft gear can be configured variable. Another advantage of the power tool is that the drive shaft through the

Hand tool can be operated quietly. The

Noise is significantly lower in an operating cardan shaft drive, as the noise of an operating gearbox gearbox.

According to a particularly advantageous embodiment of the invention may be provided in the power tool that the drive unit of

Hand tool is driven electrically or by compressed air. That is, the drive unit is connected to an electric power source or with a

compressed air generating device connected. The electrical power supply is produced in particular by means of a power cable, the compressed air supply by means of a compressed air hose. The drive unit in the handheld power tool converts the electrical energy or the energy exerted by the compressed air into a rotational movement or into a torque. Particularly preferred is a hand tool in which the power source is part of the power tool. That is, the energy source is in or on the

Hand tool arranged. Preferably, the power source is disposed within the housing. According to a particularly preferred further development, it can be provided in the handheld power tool that the energy source is an accumulator. Of course, two or more accumulators may be provided. The accumulator can be fastened in particular via a plug connection on the handheld power tool. For this purpose, the hand tool machine advantageously has a plug-in receptacle with electrical contacts into which the accumulator can be inserted. In the inserted position is the

Accumulator attachable to the power tool and electrical contacts of the accumulator can be made an electrical connection to the drive unit of the electric power tool. The accumulator is part of the hand tool. In this case, in a preferred embodiment of the portable power tool, the accumulator is arranged on the handheld power tool in such a way that it can easily be recharged by the machine in a charging station

Hand tool can be removed. By the accumulator, the power tool can be used very flexible, since it is not dependent on an external power supply. The energy source, in particular the accumulator, is connected to the drive unit in order to drive it.

According to a particularly expedient development of the invention, it may be provided in the case of the portable power tool that the cardan shaft transmission has a universal joint which connects the drive shaft of the drive unit to the output shaft of the output unit. A universal joint is a joint, which in a rotating shaft, here the drive shaft of the drive unit, a kink while continuing power transmission to the output shaft of the

Output unit allows. The universal joint is characterized in particular

characterized in that a central cross at two opposite ends with rotatable joints on the drive shaft is fixed and the other two, also opposite ends are fixed with rotatable joints on the output shaft. Universal joints have an excellent efficiency. The Torque transmission is very constant due to a universal joint. Furthermore, universal joints allow a very high torque repeatability.

In addition, a handheld power tool is preferred

characterized in that the cardan shaft gear comprises a propeller shaft, a first universal joint connecting the propeller shaft to the drive shaft of the propulsion unit, and a second universal joint connecting the propeller shaft to the propeller shaft

Output shaft of the output unit connects, has. The torque introduced by the drive unit is transmitted via the drive shaft to the first universal joint, which transmits the torque to the propeller shaft. From the propeller shaft, the torque on the second universal joint on the

Transfer output shaft of the output unit. Such a trained

Cardan shaft gear allows the transmission of torque from the drive shaft to the output shaft, wherein the axes of rotation of the drive shaft and the output shaft can be parallel to each other. However, the axes of rotation of the drive shaft and the output shaft are preferably inclined to each other. Of the

Total diffraction angle of the propeller shaft gear corresponds to the sum of the two diffraction angles between the axis of the propeller shaft and the axis of the drive shaft and the axis of the propeller shaft and the axis of the output shaft.

According to another expedient development of the invention may be provided in the power tool that the articulated shaft gear has a synchronizing shaft, a first constant velocity joint which connects the synchronizing shaft with the drive shaft of the drive unit, and a second constant velocity joint, which connects the synchronizing shaft with the output shaft of the output unit , The Gleichlaufweile represents a special form of the propeller shaft, which generates no nonuniformity in the transmission of rotational movement, even if occur at the joint bending angle. Constant velocity joints, also as

Designated wide-angle joints are joints that allow a particularly uniform torque transmission from the drive shaft to the output shaft arranged at an angle to the drive shaft. Constant velocity joints transmit the

Rotational motion very uniform even at larger diffraction angles. Furthermore, a handheld power tool is preferred in which the cardan shaft drive has a total deflection angle between 0 ° and 90 °, in particular between 15 ° and 60 ° and very particularly between 30 ° and 50 °. A constant velocity joint, for example, allows a flexion angle of up to 50 °. The flexion angle of universal joints can be up to a maximum of 45 °. By using two universal joints or two constant velocity joints with

corresponding propeller shaft or constant velocity shaft can easily flexing angle of about 50 °, i. up to 90 °. Particularly preferred

Hand tool machines in which the total deflection angle between the input and output shafts is between 15 ° and 60 °, and more particularly between 30 ° and 50 °. This allows the hand tool a

ergonomically favorable shape, similar to a pistol, may have. Of the

The shaft joint head can be adjusted in stages by the flexible cardan shaft drive. Only the housing element surrounding the cardan shaft gearbox must be changed at a bending angle change.

The propeller shaft gear of the power tool can be designed as Kardangetriebe. The Kardangetriebe has a propeller shaft, which is designed in particular hollow profile-shaped, and two universal joints or two elastic

Slices on. Elastic washers can be used for the transmission of low torques.

According to a further expedient development of the invention may be provided in the power tool that the drive shaft by means of at least a first bearing and the output shaft by means of at least one second bearing on the inner wall of the housing element of the power tool are arranged. The bearings allow the rotation of the drive and output shaft and ensure the fixation of the cardan shaft gear within the

Housing element. By the storage of the waves of the diffraction angle of the propeller shaft transmission is fixed. The bearings can be self-lubricating. The cardan shaft gear does not require constant lubrication, as is necessary with gears. Therefore, a hand tool is preferred in which the propeller shaft gear is arranged sealed within the housing element of the power tool. According to a very particular embodiment of the power tool, the power tool is a power tool, a pneumatic tool or a cordless tool. In this case, the power tool is advantageously an electric screwdriver, the compressed air-operated tool advantageously a

Pneumatic screwdriver and the cordless tool advantageously a cordless screwdriver. Such hand tool machines have very low efficiency losses, have a high torque repeatability and have low wear. Furthermore, the cardan shaft gear is in a large

Beugewinkelbereich, in particular a bending angle range of 0 ° to 90 °, can be used. This increases the flexibility of the power tool. That is, in such a hand tool machine, a flexible shaft joint head design, in particular a gradual adjustment of the shaft joint head, is possible.

Only the casing element surrounding the cardan shaft gearbox is to be adapted in the event of a change in the overall flexion angle.

The invention and its advantages are explained below with reference to a drawing. It shows schematically:

Figure 1 a in a housing element of a power tool

arranged cardan shaft gear.

FIG. 1 shows a cardan shaft transmission 1 arranged in a housing element 4 of a hand-held power tool. The housing element 4, together with the cardan shaft 1, the shaft joint head 20th

The hand tool has a drive unit and an output unit. The drive unit is via the drive shaft 2 a torque to the

Cardan shaft 1 further, which in turn the torque to the

Output shaft 3 of the output unit transmits. The drive shaft 2 is arranged sealed by means of at least a first bearing 5 on the inner wall of the housing member 4. The output shaft 3 is arranged sealed by two second bearings 6 on the inner wall of the housing member 4. The

Cardan shaft gear 1 has a propeller shaft 13, a first universal joint 1 1, the the propeller shaft 13 rotatably connects to the drive shaft 2, and a second universal joint 12 which rotatably connects the propeller shaft 13 to the output shaft 3, on. The shape of the housing element 4 indicates the Gesamtbeugewinkel the propeller shaft 1 and thus the shaft joint head 20 before. In this possible embodiment of the shaft joint head 20 has the

Cardan shaft 1 a Gesamtbeugewinkel of about 45 °. Of the

Gesamtbeuinkel corresponds to the angle between the axis of rotation 8 of

Drive shaft 2 and the rotation axis 7 of the output shaft. 3

The cardan shaft 1 can take a variety of Gesamtbeugewinkel. That is, the Gesamtbeugewinkel is only dependent on the housing element 4. Thus, the propeller shaft 1 can assume various Gesamtbeugewinkel when the housing member 4 is adjusted accordingly. Thus Gesamtbeugewinkel can be achieved from 0 ° to 90 ° by such a cardan shaft 1.

The hand tool is preferably a power tool, a

pneumatic tool or a cordless tool. That's it

Power tool in particular as an electric screwdriver, the compressed air tool in particular as a pneumatic screwdriver and the cordless tool in particular designed as a cordless screwdriver. Particularly advantageously, the power tool is designed as a cordless tool. In this case, at least one accumulator is attached to the hand tool, i. part of

Hand tool.

Hand tool machines with such shaft joint heads 20 have very low efficiency losses, have a high

Torque repeat accuracy and have a low wear. Further, the propeller shaft 1 is due to its flexibility in a large

Beugewinkelbereich, in particular a bending angle range of 0 ° to 90 °, can be used. LIST OF REFERENCE NUMBERS

1 cardan shaft drive

2 drive shaft

3 output shaft

4 housing element

5 first camp

6 second camp

7 axis of rotation of the output shaft

8 axis of rotation of the drive shaft

1 1 first universal joint

12 second universal joint

13 PTO shaft

20 shaft joint head

Claims

claims

1 . Hand tool with a drive unit which is connected to the drive with a power source, an output unit and a bevel gear for transmitting a rotational movement and torque from the drive unit at which the torque is introduced to the output unit to which

Torque is removed, wherein the drive unit has a drive shaft (2) and the output unit has an output shaft (3) and wherein the

Angular gear in a housing element (4) of the power tool is arranged, characterized in that the angular gear a

Cardan shaft gear (1).

2. Hand tool according to Claim 1, characterized in that the drive unit of the power tool is driven electrically or by compressed air.

3. Hand tool according to at least one of the preceding

Claims 1 or 2, characterized in that the energy source is part of the power tool.

4. Hand tool according to Claim 3, characterized in that the energy source is an accumulator.

5. Hand tool according to at least one of the preceding

Claims 1 to 4, characterized in that the cardan shaft gear (1) has a universal joint (1 1, 12) which connects the drive shaft (2) of the drive unit with the output shaft (3) of the output unit has.

6. Hand tool according to at least one of the preceding

Claims 1 to 4, characterized in that the cardan shaft gear (1) has a cardan shaft (13), a first universal joint (11) connecting the cardan shaft (13) to the drive shaft (2) of the drive unit, and a second universal joint (12 ) which connects the propeller shaft (13) with the output shaft (3) of the output unit has.

7. Hand tool according to at least one of the preceding

Claims 1 to 4, characterized in that the cardan shaft gear (1) a constant velocity shaft, a first constant velocity joint which connects the synchronizing shaft with the drive shaft (2) of the drive unit, and a second constant velocity joint, which the synchronizing shaft with the output shaft (3) of the output unit connects, has.

8. Hand tool according to at least one of the preceding

Claims 1 to 7, characterized in that the articulated shaft transmission (1) has a Gesamtbeugewinkel between 0 ° and 90 °, in particular between 15 ° and 60 ° and most particularly between 30 ° and 50 °.

9. Hand tool according to at least one of the preceding

Claims 1 to 8, characterized in that the cardan shaft gear (1) is designed as Kardangetriebe.

10. Hand tool according to at least one of the preceding

Claims 1 to 9, characterized in that the drive shaft (2) by means of at least a first bearing (5) and the output shaft (3) by means of at least one second bearing (6) on the inner wall of the housing element (4) of the power tool are arranged.

1 1. Hand tool according to at least one of the preceding

Claims 1 to 10, characterized in that the articulated shaft gear (1) is arranged sealed within the housing element (4) of the power tool.

12. Hand tool according to at least one of the preceding

Claims 1 to 1 1, characterized in that the hand tool is a power tool, a pneumatic tool or a cordless tool.

13. Hand tool according to Claim 12, characterized in that the power tool is an electric screwdriver, the compressed air tool a pneumatic screwdriver or the cordless tool is a cordless screwdriver.