WO2018033324A1

WO2018033324A1 - Hand-held power tool having a fluid-spraying system, and such a spraying system module

Info

Publication number: WO2018033324A1
Application number: PCT/EP2017/067991
Authority: WO
Inventors: Anton Dukart; Robert Giezendanner-Thoben
Original assignee: Robert Bosch Gmbh
Priority date: 2016-08-15
Filing date: 2017-07-17
Publication date: 2018-02-22
Also published as: DE102016215163A1

Abstract

The invention relates to a hand-held power tool (100), having a housing (110), in which a drive motor (114) is arranged, which can be actuated by means of an operating element (112), and having a fluid-spraying system (160), wherein the drive motor (114) is designed to drive a drive unit of the fluid-spraying system (160), and wherein a spraying-pressure build-up unit for producing a defined spraying pressure for spraying a fluid via a fluid outlet opening (180) is associated with the fluid-spraying system (160). In said hand-held power tool, the drive unit is designed in the manner of a cam drive having a cam element.

Description

HAND TOOL MACHINE WITH A FLUI D SPRAY SYSTEM AND SUCH SPRAYING SYSTEM MODULE Description Title

Hand tool with a fluid injection system prior art

The present invention relates to a handheld power tool having a housing in which a drive motor operable via a control element is arranged, and to a fluid injection system, wherein the drive motor is designed to drive a drive unit of the fluid injection system, and wherein the fluid Spray system is associated with an injection pressure build-up unit for generating a predetermined injection pressure for spraying a fluid via a Fluidaustrittsöff- opening. From the prior art is such a power tool with a

Fluid spray system 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 through a fluid outlet opening, the fluid

Spraying system associated with an injection pressure build-up unit.

DISCLOSURE OF THE INVENTION The present invention provides a hand tool machine having a housing in which a control actuatable drive motor is disposed, and a fluid injection system, wherein the drive motor is adapted to drive a drive unit of the fluid injection system, and wherein Fluid injection system An injection pressure build-up 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 designed 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, in a simple manner, a tool attachment can be provided, which is designed 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 with a tool attachment for the hand tool having a fluid injection system ready, wherein the drive motor is adapted to drive a drive unit of the fluid injection system, wherein the fluid injection system is assigned a Spntzdruckaufbaueinheit 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 is a side view of a hand tool with a fluid injection system,

FIG. 2 shows a side view of a tool system with a handheld power tool and a tool attachment with the fluid injection system of FIG. 1, FIG.

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

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

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

Fig. 6 is an exemplary injection pressure-course diagram, and

Fig. 7 is a schematic view of the drive unit of the fluid injection system of Fig. 5 associated cam member.

Description of the embodiments

1 shows a hand tool 100 with a housing 1 10. The housing 1 10 is preferably pistol-shaped and has a Griffbe- rich 1 16 and a first and second housing portion 1 17, 156. Illustratively, the first housing portion 1 17 between the handle portion 1 16 and the second housing portion 156 is formed. Preferably, the portable power tool 100 is mechanically and electrically connected to a battery pack 120 for mains-independent power supply. Illustratively, the battery pack is 120 in

Gripping portion 1 16 arranged, but can also be arranged in the first housing portion 1 17. In addition, the power tool 100 may also be formed network dependent. Furthermore, in the housing 1 10, illustratively and by way of example in the first housing portion 1 17, an operable via an operating element 1 12 12 12 12 14 12 14 14 14 14 14 14 14 12 14 20 25 20 25 20 25 30 35 40 45 50 65 14 operable. The housing 1 10 forms an axial and radial direction 101, 102 from. The hand tool 100 is e.g. via the handset 1 12 operable, i. 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. Illustratively and by way of example, the handset 1 12 is arranged in the region of the grip region 16. According to one embodiment, the hand tool 100 is designed in the manner of a fluid spray gun with a fluid injection system 160. Preferably, the fluid spray system 160 is disposed in the second housing portion 156 and is configured to squirt fluid during operation. In this case, the drive motor 1 14 is preferably designed to drive a drive unit (310 in FIG. 3) of the fluid injection system 160. Furthermore, the fluid

Spray system 160 an injection pressure build-up unit (320 in Fig. 3) for generating a predetermined injection pressure for spraying a fluid via 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 may be arranged in a fluid container 170, preferably via a detachable connection 175 is arranged on the machine tool 100. The fluid container 170 can preferably be arranged on a fastening section 172 assigned to the fluid injection system 160. In this case, the fluid container 170 is connected to the fluid injection system 160 via the attachment portion 172, wherein a fluid transport unit (350 in FIG. 3) associated with the fluid injection system 160 is preferably configured to transfer fluid from the fluid container 170 into a fluid chamber (330 in Fig. 3) to transport. In the fluid chamber (330 in Fig. 3), the injection pressure build-up unit (320 in Fig. 3) preferably generates a predetermined injection pressure for squirting the fluid. In this case, the fluid is sprayed under the predetermined injection pressure via the fluid outlet opening 180. Preferably, the fluid outlet opening 180 is formed in the manner of a twin-jet nozzle 185, whereby even highly viscous fluids can be atomized without dilution. However, the fluid outlet opening 180 may also be designed as a conventional swirl atomizer nozzle. 2 shows a hand tool 200 having a housing 210. The housing 210 is preferably designed pistol-shaped and has a grip region 216 and a housing section 217 adjoining it. Preferably, the portable power tool 200 is mechanically and electrically connected to a battery pack 220 for mains-independent power supply. Illustratively, the battery pack 220 is arranged in the grip region 216, but can also be used in the

Housing portion 217 may be arranged. In addition, the hand tool 200 may also be formed network dependent.

Furthermore, in the housing 210, illustratively and by way of example in the housing section 217, a drive motor 214, which can be actuated via an operating element 212, is arranged with a drive shaft 218. In this case, the housing 210 forms an axial and radial direction 203, 204. The hand tool 200 is e.g. operated via the hand switch 212, i. 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. Illustratively and by way of example, the manual switch 212 is arranged in the region of the grip region 216.

According to one embodiment, the hand tool 200 is in the manner of a screwdriver, in particular a cordless screwdriver for rotating drive an insertion tool and / or a detachable on the power tool 200 attachable tool attachment 250 formed. However, it should be noted that the hand tool 100 may also be designed as a drill or the like and / or the tool attachment 250 is designed such that it can be applied to a conventional screwdriver can. The drive motor 214 of the handheld power tool 200 is preferably designed to drive a drive unit (310 in FIG. 3) of the tool attachment 250 via the drive shaft 218.

Preferably, the tool attachment 250 is designed to spray a fluid. The tool attachment 250 preferably has a housing 256, in which preferably the fluid injection system 160 of FIG. 1 is arranged. In addition, the tool attachment 250 preferably has the fluid container 170 of FIG. 1, which, analogously to FIG. 1, is preferably arranged on the housing 256 of the tool attachment 250 via the detachable connection 175 of FIG. 1 and thus via the attachment section 172 of FIG , Furthermore, the tool attachment 250 preferably has the fluid outlet opening 180 of FIG. 1. The hand tool 200 and the tool attachment 250 preferably form a tool system 290. FIG. 3 shows the fluid injection system 160 of FIGS. 1 and 2 and illustrates a first exemplary configuration of the fluid injection system 160 of FIGS. 1 and 2. The fluid injection system 160 preferably includes a drive unit 310, an injection pressure buildup unit 320, a fluid chamber 330 and a fluid transport unit 350. In this case, according to the first embodiment, the fluid transport unit 350 is associated with a separate drive 340.

The drive unit 310 is preferably designed in the manner of a cam drive with a cam element (512 in FIG. 5). In this case, the drive unit 310 is preferably designed at least to drive the injection pressure build-up unit 320. The injection pressure build-up unit 320 is preferably designed to generate a predetermined injection pressure for spraying the fluid via the fluid outlet opening 180 of FIGS. 1 and 2. In this case, the fluid chamber 330 is configured to be acted upon by the predetermined injection pressure generated by the injection pressure build-up unit 320. Preferably, the fluid outlet opening 180 is arranged on the fluid chamber 330, so that the NEN pressurized fluid can leave the fluid chamber 330 through the fluid outlet opening 180.

Furthermore, the fluid transport unit 350 is provided for fluid transport from the fluid reservoir 170 of FIGS. 1 and 2 into the fluid chamber 330. Preferably, the fluid transport unit 350 is designed for contactless fluid transport, whereby the fluid transport unit 350 is 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.

FIG. 4 shows the fluid injection system 160 of FIG. 1 and FIG. 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 and the fluid transport unit 350 of FIG. 3. In this case, according to the second embodiment, the drive unit 310 is assigned to the fluid transport unit 350. Preferably, the drive unit 310 is configured to drive the injection pressure buildup unit 320 and the fluid transport unit 350.

FIG. 5 shows the fluid injection system 160 of FIG. 4 and illustrates the drive unit 310 of FIG. 4, which is preferably designed as a cam drive, and the injection pressure buildup unit 320 of FIG. 4. The fluid injection system 160 or the drive unit 310 preferably has one Camshaft 514 formed drive shaft 514, which is preferably connected to a cam member 512. Illustratively and by way of example, the camshaft 514 is formed integrally with the cam member 512, but could also be connected via any connection, e.g. a welding, clamping and / or screw, be connected to this. Preferably, the cam member 512 in the axial or radial direction 101, 102; 203, 204 of Fig. 1 and Fig. 2 of the housing 1 10; 220 of Fig. 1 and Fig. 2 aligned. However, the cam member 512 may also be aligned in the axial or radial direction of the second housing portion 156 of FIG. 1 and the housing 256 of FIG. 2, respectively. Illustratively, the injection pressure buildup unit 320 has a piston 522 and the

Camming element 512 is preferably designed to move piston 522 to the deflection of the predetermined injection pressure. However, the injection pressure build-up unit 320 may also be connected directly, ie without the piston 522, or connected to the cam element 512 so that the cam element 512 directly deflects the injection pressure build-up unit 320.

FIG. 6 shows an exemplary injection pressure profile diagram 600, which illustrates that the predetermined injection pressure in the fluid chamber 330 of FIGS. 3 to 5 is varied as a function of a rotational speed of the drive unit 310 of FIGS. 3 to 5 can. The predetermined injection pressure is illustratively plotted on an ordinate 604 in bar and a time is on an abscissa 602 of FIG

Plotted graph 600.

Here, a first measurement curve 610 illustrates 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 rpm a maximum injection pressure of approximately 35 bar.

FIG. 7 shows an exemplary embodiment of the cam element 512 of the cam drive 310 of FIG. 5. The cam element 512 illustratively has an at least approximately round base body 712 with a radius R of, for example, 10 mm, and a deflection section 714. The deflection section 714 is preferably designed to deflect the exemplary piston 522 of FIG. 5 of the injection pressure build-up unit 320 of FIGS. 3 to 5 to generate the predetermined injection pressure by a predetermined distance d. Preferably, the distance d is 1 mm.

Illustratively, in one exemplary operation of the cam drive 310, the cam member 512 rotates, for example, counterclockwise or in the direction of an arrow 701, with the example piston 522 being driven clockwise or in the direction of an arrow 702. The deflection section 714 hits the Piston 522, so this is deflected by the distance d, here preferably 1 mm, illustratively down or in the direction of arrow 703. As a result, the injection pressure of preferably 40 bar is generated. As described above, it should be noted that the cam drive 310 and the cam member 512 may also directly deflect the injection pressure buildup unit 320 of FIGS. 3 to 5.

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

claims

1 . Powered hand tool (100) having a housing (1 10) in which via a control element (1 12) operable drive motor (1 14) is arranged, and with a fluid injection system (160), wherein the drive motor (1 14) formed thereto is to drive a drive unit (310) of the fluid injection system (160), and wherein the fluid injection system (160) is associated with a Spntzdruckaufbaueinheit (320) for generating a predetermined injection pressure for splashing a fluid through a fluid outlet opening (180), characterized in that the drive unit (310) is designed in the manner of a cam drive with a cam element (512).

2. Hand tool according to Claim 1, characterized in that the drive unit (310) is at least adapted to drive the Spntzdruckaufbaueinheit (320).

3. 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 (1 10) is aligned.

4. Hand tool according to one of the preceding claims,

characterized in that the pressure generating assembly (320) comprises a piston (522) and the cam member (512) is adapted to deflect the piston (522) to produce the predetermined injection pressure by a predetermined distance (d).

5. Hand tool according to one of the preceding claims,

characterized in that the fluid outlet opening (180) has a twinjet nozzle (185) or a swirl atomizer nozzle.

6. Hand tool according to one of the preceding claims,

characterized in that a fluid transport unit (350) to the fluid Transport of a fluid container (170) in a Fiuidkammer (330) is provided.

7. Hand tool according to claim 6, characterized in that the Fiuidkammer (330) is adapted to be applied to the by the injection pressure build-up unit (320) generated, predetermined injection pressure.

8. Hand tool according to Claim 6 or 7, characterized in that the fluid outlet opening (180) on the Fiuidkammer (330) is arranged.

9. 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 centrifugal compressor.

10. Hand tool according to one of claims 6 to 9, characterized in that the fluid transport unit (350) of the drive unit (310) or a separate drive (340) is drivable.

1 1. Hand tool according to one of the preceding claims, which is designed for spraying a high-viscosity fluid and / or a color.

12. Hand tool according to one of the preceding claims,

characterized in that the fluid injection system (160) is associated with a releasably attachable to the hand tool (200) tool attachment (250).

13. Tool attachment (250) for a hand tool (200) with a housing (210) in which via a control element (212) operable drive motor (214) is arranged, wherein the tool attachment (250) comprises a fluid injection system (160) wherein the drive motor (214) is adapted to drive a drive unit (310) of the fluid injection system (160), and wherein the injection fluid pressure system (160) comprises an injection pressure assembly (320) for generating a predetermined injection pressure for splashing a fluid via a fluid outlet opening (180) is assigned, and wherein the drive unit (310) is designed in the manner of a cam drive with a cam member (512).

14. Tool system (290) with a hand tool (200) with a housing (210) in which a via an operating element (212) operable drive motor (214) is arranged and with a tool attachment (250) for the power tool (200) with a fluid Spray system (160), wherein the drive motor (214) is adapted to drive a drive unit (310) of the fluid injection system (160), and wherein the fluid injection system (160) comprises an injection pressure buildup unit (320) for generating a predetermined injection pressure Splashing of a fluid via a fluid outlet opening (180) is assigned, wherein the drive unit (310) is designed in the manner of a cam drive with a cam member (512).