DE102016215163A1 - Hand tool with a fluid injection system - Google Patents

Abstract

In a handheld power tool (100) having a housing (110) in which a drive motor (114) which can be actuated via an operating element (112) is arranged, and with a fluid injection system (160), wherein the drive motor (114) is designed to drive a drive unit of the fluid injection system (160), and wherein the fluid injection system (160) is associated with an injection pressure build-up unit for generating a predetermined injection pressure for splashing a fluid via a fluid outlet opening (180), the drive unit is in the form of a cam drive with a cam element educated.

Description

State of the art

The present invention relates to a portable power tool with a housing in which is arranged via a control operable drive motor, and with a fluid injection system, wherein the drive motor is adapted to drive a drive unit of the fluid injection system, and wherein the fluid injection system Injection pressure buildup unit for generating a predetermined injection pressure for spraying a fluid is assigned via a fluid outlet opening.

From the prior art, such a hand tool machine with a fluid injection system is known. This hand tool has a housing in which a drive motor is arranged, which is actuated via an associated operating element. The drive motor serves to drive a drive unit of the fluid injection system. To generate a predetermined injection pressure for spraying a fluid via a fluid outlet opening, an injection pressure buildup unit is assigned to the fluid injection system.

Disclosure of the invention

The present invention provides a handheld power tool having a housing in which a control actuatable drive motor is disposed, and a fluid injection system, wherein the drive motor is configured to drive a drive unit of the fluid injection system, and wherein the fluid injection system an injection pressure buildup unit for generating a predetermined injection pressure for spraying a fluid via a fluid outlet opening is assigned. The drive unit is designed in the manner of a cam drive with a cam element.

The invention thus makes it possible to provide a hand tool machine with a fluid injection system in which an improved efficiency of the fluid injection system can be achieved by the cam drive. Thus, an efficient and powerful drive unit of the fluid injection system can be provided, which is also suitable for highly viscous fluids.

Preferably, the drive unit is at least configured to drive the injection pressure buildup unit. Thus, a drive of the injection pressure build-up unit can be made possible in a simple manner.

The cam element is preferably aligned in the axial or radial direction of the housing. Thus, an uncomplicated and space-saving arrangement of the cam member can be made possible.

According to one embodiment, the injection pressure buildup unit comprises a piston and the cam element is designed to deflect the piston by a predetermined distance in order to generate the predetermined injection pressure. Thus, the injection pressure can be generated easily and reliably.

The fluid outlet opening preferably has a twinjet nozzle or a swirl atomizing nozzle. Thus, a suitable fluid outlet opening can be provided in a simple manner.

A fluid transport unit for fluid transport from a fluid container into a fluid chamber is preferably provided. Thus, a safe and uncomplicated transport of the fluid from the fluid container into a fluid chamber can be made possible.

According to one embodiment, the fluid chamber is designed to be acted on by the predetermined injection pressure generated by the injection pressure buildup unit. Thus, the fluid can be atomized in a simple manner with the predetermined spray pressure.

The fluid outlet opening is preferably arranged on the fluid chamber. Thus, a direct atomization of the fluid after exposure to the predetermined injection pressure can be made possible.

Preferably, the fluid transport unit is designed in the manner of a compressed air source, a compressor, a micromembrane pump and / or a radial compressor. Thus, a stable and reliable fluid transport unit for transporting the fluid can be provided.

According to one embodiment, the fluid transport unit can be driven by the drive unit or a separate drive. Thus, a suitable drive of the fluid transport unit can be provided.

Preferably, the hand tool is designed for spraying a high-viscosity fluid and / or a color. Thus, it can be dispensed with a dilution of the fluid and / or the color and thereby a simplified operation are possible.

The fluid injection system is preferably associated with a tool attachment which can be fastened detachably to the handheld power tool. Thus, a tool attachment can be provided in a simple manner be formed, which is for spraying a fluid.

Furthermore, the present invention provides a tool attachment for a hand tool with a housing in which a operable via a control drive motor is arranged, wherein the tool attachment comprises a fluid injection system, wherein the drive motor is adapted to drive a drive unit of the fluid injection system wherein the fluid injection system is associated with an injection pressure buildup unit for generating a predetermined injection pressure for spraying a fluid via a fluid outlet opening, and wherein the drive unit is designed in the manner of a cam drive with a cam element.

In addition, the present invention provides a tool system with a hand tool with a housing in which a operable via a control drive motor is arranged, and provided with a tool attachment for the power tool with a fluid injection system, wherein the drive motor is adapted to a drive unit of To drive fluid injection system, wherein the fluid injection system is associated with an injection pressure generating unit for generating a predetermined injection pressure for splashing a fluid through a fluid outlet opening, and wherein the drive unit is formed in the manner of a cam drive with a cam member.

Brief description of the drawings

The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. Show it:

1 a side view of a hand tool with a fluid injection system,

2 a side view of a tool system with a hand tool and a tool attachment to the fluid injection system of 1 .

3 a schematic view of a structure of the fluid injection system of 1 and 2 according to a first embodiment,

4 a schematic view of a structure of the fluid injection system of 1 and 2 according to a second embodiment,

5 a sectional perspective view of the fluid injection system of 3 .

6 an exemplary injection pressure curve diagram, and

7 a schematic view of the drive unit of the fluid injection system of 5 associated cam element.

Description of the embodiments

1 shows a hand tool 100 with a housing 110 , The housing 110 is preferably pistol-shaped and has a grip area 116 and a first and second housing portion 117 . 156 on. Illustrative is the first housing section 117 between the handle area 116 and the second housing portion 156 educated. Preferably, the hand tool is 100 for mains-independent power supply mechanically and electrically with a battery pack 120 connectable. Illustrative is the battery pack 120 in the grip area 116 arranged, but can also be in the first housing section 117 be arranged. In addition, the hand tool 100 also be designed network-dependent.

Furthermore, in the housing 110 , illustrative and exemplary in the first housing section 117 , a via a control 112 actuatable drive motor 114 arranged. In this case, the housing forms 110 an axial and radial direction 101 . 102 out. The hand tool machine 100 is eg via the handset 112 actuated, that is switched on and off, and preferably so electronically controlled or controlled that both a reversing operation, as well as specifications with respect to a desired rotational speed can be realized. Illustrative and exemplary is the handset 112 in the area of the grip area 116 arranged.

According to one embodiment, the hand tool is 100 like a fluid spray gun with a fluid spray system 160 educated. Preferably, the fluid injection system 160 in the second housing section 156 arranged and adapted to squirt a fluid during operation. Here is the drive motor 114 preferably designed to be a drive unit ( 310 in 3 ) of the fluid spray system 160 drive. Furthermore, the fluid injection system 160 an injection pressure buildup unit ( 320 in 3 ) for generating a predetermined injection pressure for spraying a fluid through a fluid outlet opening 180 on.

Preferably, the fluid is a high viscosity fluid and / or a color. It should be noted, however, that the fluid may also be any other sprayed material, for example a lacquer, a glaze, a primer, a wood preservative, a mordant, etc. The fluid is preferably in a fluid container 170 can be arranged, preferably via a detachable connection 175 on the hand tool 100 is arranged.

The fluid container is preferred 170 at a the fluid injection system 160 associated attachment portion 172 arranged. Here is the fluid container 170 over the attachment section 172 with the fluid spray system 160 connected, one being the fluid injection system 160 associated fluid transport unit ( 350 in 3 ) is preferably adapted to fluid from the fluid container 170 into a fluid chamber ( 330 in 3 ) to transport. In the fluid chamber ( 330 in 3 ) generates the injection pressure build-up unit ( 320 in 3 ) preferably a predetermined injection pressure for spraying the fluid. In this case, the fluid is below the predetermined injection pressure via the fluid outlet opening 180 sprayed. Preferably, the fluid outlet opening 180 in the manner of a twinjet nozzle 185 formed, whereby even highly viscous fluids can be atomized without dilution. However, the fluid outlet opening 180 be designed as a conventional swirl atomizer.

2 shows a hand tool 200 with a housing 210 , The housing 210 is preferably pistol-shaped and has a grip area 216 and a subsequent housing section 217 on. Preferably, the hand tool is 200 for mains-independent power supply mechanically and electrically with a battery pack 220 connectable. Illustrative is the battery pack 220 in the grip area 216 arranged, but can also be in the housing section 217 be arranged. In addition, the hand tool 200 also be designed network-dependent.

Furthermore, in the housing 210 , illustrative and exemplary in the housing section 217 , a via a control 212 actuatable drive motor 214 with a drive shaft 218 arranged. In this case, the housing forms 210 an axial and radial direction 203 . 204 out. The hand tool machine 200 is eg via the handset 212 actuated, that is switched on and off, and preferably so electronically controlled or controlled that both a reversing operation, as well as specifications with respect to a desired rotational speed can be realized. Illustrative and exemplary is the handset 212 in the area of the grip area 216 arranged.

According to one embodiment, the hand tool is 200 in the manner of a screwdriver, in particular a cordless screwdriver for the rotary drive of an insertion tool and / or a detachable on the hand tool 200 attachable tool attachment 250 educated. It is noted, however, that the hand tool 100 can also be designed as a drill or the like and / or the tool attachment 250 is designed so that it can be applied to a conventional screwdriver. The drive motor is preferred 214 the hand tool machine 200 adapted to a drive unit ( 310 in 3 ) of the tool attachment 250 over the drive shaft 218 drive.

Preferred is the tool attachment 250 adapted to squirt a fluid. The tool attachment 250 preferably has a housing 256 in which preferably the fluid injection system 160 from 1 is arranged. In addition, the tool attachment points 250 prefers the fluid container 170 from 1 on, the analog to 1 preferably via the detachable connection 175 from 1 and thus over the attachment section 172 from 1 on the housing 256 of the tool attachment 250 is arranged. Furthermore, the tool attachment 250 preferably, the fluid outlet opening 180 from 1 on. Preferably, the hand tool machine form 200 and the tool attachment 250 a tooling system 290 out.

3 shows the fluid injection system 160 from 1 and 2 and illustrates a first exemplary construction of the fluid injection system 160 from 1 and 2 , The fluid injection system 160 preferably has a drive unit 310 , an injection pressure buildup unit 320 , a fluid chamber 330 and a fluid transport unit 350 , Here, according to the first embodiment, the fluid transport unit 350 a separate drive 340 assigned.

Preferably, the drive unit 310 in the manner of a cam drive with a cam element ( 512 in 5 ) educated. Here is the drive unit 310 preferably designed at least to the injection pressure build-up unit 320 drive. The injection pressure buildup unit 320 is preferably for generating a predetermined injection pressure for spraying the fluid through the fluid outlet opening 180 from 1 and 2 educated. Here is the fluid chamber 330 adapted to that of the injection pressure build-up unit 320 generated to be applied, predetermined injection pressure. The fluid outlet opening is preferred 180 at the fluid chamber 330 arranged so that the acted upon by the predetermined injection pressure fluid fluid chamber 330 through the fluid outlet opening 180 can leave.

Furthermore, the fluid transport unit 350 for fluid transport from the fluid container 170 from 1 and 2 into the fluid chamber 330 intended. The fluid transport unit is preferred 350 formed for contactless fluid transport, whereby the fluid transport unit 350 low maintenance and durable. The fluid transport unit 350 is preferably designed in the manner of a compressed air source, a compressor, a micromembrane pump and / or a radial compressor.

4 shows the fluid injection system 160 from 1 and 2 and illustrates a second exemplary construction of the fluid injection system 160 , The fluid injection system 160 preferably has the drive unit 310 , the injection pressure buildup unit 320 , the fluid chamber 330 as well as the fluid transport unit 350 from 3 on. Here, according to the second embodiment, the drive unit 310 the fluid transport unit 350 assigned. Preferably, the drive unit 310 adapted to the injection pressure build-up unit 320 and the fluid transport unit 350 drive.

5 shows the fluid injection system 160 from 4 and illustrates the preferred trained as a cam drive unit 310 from 4 as well as the injection pressure buildup unit 320 from 4 , The fluid injection system 160 or the drive unit 310 preferably has one as a camshaft 514 trained drive shaft 514 on, preferably with a cam element 512 connected is. Illustrative and exemplary is the camshaft 514 integral with the cam member 512 trained, but could also be connected via an arbitrary connection, such as a welding, clamping and / or screw connection with this. The cam element is preferred 512 in the axial or radial direction 101 . 102 ; 203 . 204 from 1 respectively. 2 of the housing 110 ; 220 from 1 respectively. 2 aligned. However, the cam element 512 also in the axial or radial direction of the second housing section 156 from 1 or of the housing 256 from 2 be aligned.

Illustratively, the injection pressure buildup unit 320 a piston 522 on and the cam element 512 is preferably adapted to the piston 522 to deflect to generate the predetermined injection pressure. However, the injection pressure build-up unit may 320 also directly, ie without the piston 522 be formed, or with the cam member 512 be connected so that the cam element 512 the injection pressure buildup unit 320 deflects directly.

6 shows an exemplary injection pressure curve diagram 600 , which clarifies that the predetermined injection pressure in the fluid chamber 330 from 3 to 5 as a function of a rotational speed of the drive unit 310 from 3 to 5 can be varied. The predetermined injection pressure is illustrative on an ordinate 604 plotted in cash and a time is on an abscissa 602 of the measurement diagram 600 applied.

This illustrates a first trace 610 an exemplary measurement at a speed of 4000 rpm (revolutions per minute), a second measurement curve 620 a measurement at a speed of 3500 rpm, a third measurement curve 630 a measurement at a speed of 3000 rpm and a fourth measurement curve 640 a measurement at a speed of 2500 rpm. Illustratively, with a speed of 4000 rpm, a maximum injection pressure of approximately 60 bar, with a speed of 3500 rpm, a maximum injection pressure of approximately 45 bar, with a speed of 3000 rpm, a maximum injection pressure of approximately 40 bar and with a speed of 2500 UPM allows a maximum injection pressure of approximately 35 bar.

7 shows an exemplary embodiment of the cam member 512 of the cam drive 310 from 5 , The cam element 512 Illustratively has an at least approximately round body 712 with a radius R of 10mm by way of example, and a deflection section 714 on. The deflection section 714 is preferably adapted to the exemplary piston 522 from 5 the injection pressure buildup unit 320 from 3 to 5 for deflecting the predetermined injection pressure by a predetermined distance d. The distance d is preferably 1 mm.

In an exemplary operation of the cam drive 310 the cam element rotates 512 Illustratively, for example, counterclockwise or in the direction of an arrow 701 wherein the exemplary piston 522 clockwise or in the direction of an arrow 702 is driven. Meets the deflection section 714 on the piston 522 , so this is by the distance d, here preferably 1mm, illustratively down or in the direction of an arrow 703 deflected. As a result, the injection pressure of preferably 40 bar is generated. As described above, it should be noted that the cam drive 310 or the cam element 512 the injection pressure buildup unit 320 from 3 to 5 can also deflect directly. It should also be pointed out that the numerical values described are merely exemplary in character and are not to be regarded as limiting the invention and can therefore assume any desired values.

Claims (14)

Hand tool machine ( 100 ) with a housing ( 110 ), in which one via a control element ( 112 ) actuatable drive motor ( 114 ), and with a fluid injection system ( 160 ), wherein the drive motor ( 114 ) is adapted to a drive unit ( 310 ) of the fluid spray system ( 160 ), and wherein the fluid injection system ( 160 ) an injection pressure buildup unit ( 320 ) for generating a predetermined injection pressure for spraying a fluid via a fluid outlet opening ( 180 ), characterized in that the drive unit ( 310 ) in the manner of a cam drive with a cam element ( 512 ) is trained. Powered hand tool according to claim 1, characterized in that the drive unit ( 310 ) is at least adapted to the injection pressure build-up unit ( 320 ) to drive. Powered hand tool according to claim 1 or 2, characterized in that the cam element ( 512 ) in the axial or radial direction ( 101 . 102 ) of the housing ( 110 ) is aligned. Hand tool according to one of the preceding claims, characterized in that the injection pressure build-up unit ( 320 ) a piston ( 522 ) and the cam element ( 512 ) is adapted to the piston ( 522 ) to generate the predetermined injection pressure by a predetermined distance (d) deflect. Hand tool according to one of the preceding claims, characterized in that the fluid outlet opening ( 180 ) a twinjet nozzle ( 185 ) or a swirl atomizer nozzle. Hand tool according to one of the preceding claims, characterized in that a fluid transport unit ( 350 ) for fluid transport from a fluid container ( 170 ) in a fluid chamber ( 330 ) is provided. Hand tool according to claim 6, characterized in that the fluid chamber ( 330 ) is adapted to be filled with the pressure from the injection pressure build-up unit ( 320 ), to be applied to predetermined injection pressure. Powered hand tool according to claim 6 or 7, characterized in that the fluid outlet opening ( 180 ) at the fluid chamber ( 330 ) is arranged. Hand tool according to one of claims 6 to 8, characterized in that the fluid transport unit ( 350 ) is designed in the manner of a compressed air source, a compressor, a micromembrane pump and / or a radial compressor. Hand tool according to one of claims 6 to 9, characterized in that the fluid transport unit ( 350 ) from the drive unit ( 310 ) or a separate drive ( 340 ) is drivable. Hand tool according to one of the preceding claims, which is designed for spraying a high-viscosity fluid and / or a color. Hand tool according to one of the preceding claims, characterized in that the fluid injection system ( 160 ) one releasably on the hand tool ( 200 ) attachable tool attachment ( 250 ) assigned. Tool attachment ( 250 ) for a hand tool ( 200 ) with a housing ( 210 ), in which one via a control element ( 212 ) actuatable drive motor ( 214 ), wherein the tool attachment ( 250 ) a fluid injection system ( 160 ), wherein the drive motor ( 214 ) is adapted to a drive unit ( 310 ) of the fluid spray system ( 160 ), and wherein the fluid injection system ( 160 ) an injection pressure buildup unit ( 320 ) for generating a predetermined injection pressure for spraying a fluid via a fluid outlet opening ( 180 ), and wherein the drive unit ( 310 ) in the manner of a cam drive with a cam element ( 512 ) is trained. Tool system ( 290 ) with a hand tool ( 200 ) with a housing ( 210 ) in which a via a control element ( 212 ) actuatable drive motor ( 214 ) and with a tool attachment ( 250 ) for the hand tool ( 200 ) with a fluid injection system ( 160 ), wherein the drive motor ( 214 ) is adapted to a drive unit ( 310 ) of the fluid spray system ( 160 ), and wherein the fluid injection system ( 160 ) an injection pressure buildup unit ( 320 ) for generating a predetermined injection pressure for spraying a fluid via a fluid outlet opening ( 180 ), wherein the drive unit ( 310 ) in the manner of a cam drive with a cam element ( 512 ) is trained.

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