Hand-held power tool

Patent metadata

Field	Value
Publication number	US-9610700-B2
Application number	US-201113190627-A
Country	US
Kind code	B2
Filing date	Jul 26, 2011
Priority date	Aug 11, 2010
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

In a hand-held power tool with a drive motor and a clutch connected to the drive motor and having an output part, the drive pinion is fixedly connected to the output part of the clutch so as to be driven by the drive motor for driving a tool. The drive pinion has a first individual part and a second individual part that are fixedly connected to each other. The first individual part has a toothing and the second individual part is connected to the output part of the clutch.

First claim

What is claimed is:

1. A hand-held power tool comprising:
a drive motor;
a clutch connected to said drive motor and comprising a clutch drum;
a drive pinion driven by said drive motor to drive a tool, said drive pinion comprised of a first individual part and a second individual part, wherein said second individual part is soldered or welded to said clutch drum, and wherein said first individual part and said second individual part are soldered to each other, wherein said second individual part comprises an end face that is facing said first individual part;
a bearing;
said drive pinion rotatably supported in said bearing, wherein said second individual part comprises an outer circumference forming a bearing seat, wherein said bearing is arranged on said bearing seat;
wherein said first individual part comprises a toothing that is arranged on an outer circumference of said first individual part, wherein said toothing extends to and adjoins said end face of said second individual part;
wherein said first individual part has a section provided with the largest diameter of said first individual part;
wherein said second individual part has an outer diameter at said bearing seat, wherein said outer diameter of said second individual part at said bearing seat is greater than said largest diameter of said first individual part or is identical to said largest diameter of said first individual part.

2. The power tool according to claim 1 , wherein said first individual part comprises a section that has the largest diameter of said first individual part and wherein a functional area of said toothing extends across an entire length of said section with said largest diameter.

3. The power tool according to claim 1 , wherein between said first individual part and said second individual part a closed receptacle for a ring of soldering material is formed.

4. The power tool according to claim 3 , wherein said first individual part has a shoulder and said second individual part has an annular recess, wherein said shoulder and said recess delimit said receptacle.

5. The power tool according to claim 1 , wherein said drive pinion has an engagement element for the tool and said engagement element is arranged on a side of said drive pinion that is facing away from said clutch.

6. The power tool according to claim 5 , wherein said engagement element is an internal hexagon opening.

7. The power tool according to claim 6 , wherein said internal hexagon opening is a section of a through opening provided in said first individual part.

8. The power tool according to claim 1 , wherein said clutch is a centrifugal clutch.

9. The power tool according to claim 1 , wherein said second individual part of said drive pinion has a pin that projects into an opening of said clutch drum.

10. The power tool according to claim 1 , further comprising an eccentric drive having a gear wheel that engages said drive pinion.

11. The power tool according to claim 1 in the form of a hedge trimmer with at least one blade.

12. The power tool according to claim 1 , wherein said drive motor is an internal combustion engine.

13. The power tool according to claim 1 , wherein said bearing is a roller bearing.

14. The power tool according to claim 13 , further comprising a detention ring, wherein between said bearing seat and said toothing a groove is provided, wherein said detention ring is arranged in said groove and secures an inner ring of said bearing.

15. The power tool according to claim 1 , wherein said first individual part comprises an end face that is facing away from said second individual part, wherein said first individual part comprises a shoulder, wherein a diameter of said first individual part is reduced at said shoulder, wherein said second individual part is resting on said shoulder, and wherein said toothing extends all the way from said end face of said first individual part to said shoulder.

16. A hedge trimmer comprising:
at least one hedge trimmer blade;
a drive motor;
a clutch connected to said drive motor and comprising an output part;
a drive pinion comprised at least of a first individual part and a second individual part, wherein said first and second individual parts are soldered to each other, wherein said second individual part is fixedly connected to said output part, and wherein said first individual part comprises a toothing;
a bearing supporting said drive pinion at one end of said drive pinion, wherein said bearing is positioned, viewed in an axial direction of said drive pinion, between said output part of said clutch and an area of said first individual part provided with said toothing;
wherein said motor drives through said clutch said drive pinion that drives via an eccentric gear said at least one hedge trimmer blade;
wherein said first individual part comprises a pin and said second individual part comprises a pin-receiving recess, wherein said pin projects into said pin-receiving recess of said second individual part, wherein between said first and second individual parts a receptacle is formed and accommodates soldering material, wherein said receptacle is closed off by said pin inserted into said pin-receiving recess.

17. The hedge trimmer according to claim 16 , wherein said second individual part comprises an end face and further comprises an annular recess at a transition from said end face into said pin-receiving recess, wherein said annular recess delimits said receptacle.

Assignees

• Hittmann Markus
• Schenk Ralf
• Rethaber Achim
• Stihl Ag & Co Kg Andreas

Inventors

• Hittmann Markus
• Schenk Ralf
• Rethaber Achim

Classifications

• B27B17/08

  Drives or gearings; Devices for swivelling or tilting the chain saw · CPC title

• A01G3/053

  motor-driven · CPC title

• B27B17/10 Primary

  Transmission clutches specially designed for chain saws · CPC title