Portable Work Apparatus

Patent metadata

Field	Value
Publication number	US-2023264335-A1
Application number	US-202318170911-A
Country	US
Kind code	A1
Filing date	Feb 17, 2023
Priority date	Feb 21, 2022
Publication date	Aug 24, 2023
Grant date	—

Abstract

A portable work apparatus comprises a housing (2) and a tool (9). A drive motor (5) is arranged in the housing (2) between the first end (3) and the second end (4) and has a drive shaft (7) for driving the tool (9). The drive motor (5) has a first bearing (12) and a second bearing (13). The drive shaft (7) is rotatably (11) supported relative to the housing (2) by means of the first bearing (12) and the second bearing (13). A drive transmission unit (8) is functionally arranged between the drive motor (5) and the tool (9). The work apparatus (1) has additional bearing (14) for supporting the drive shaft (7) relative to the housing (2) of the work apparatus (1) arranged on the drive shaft (7).

First claim

What is claimed is:

1 . A portable work apparatus, comprising:
a housing ( 2 ), the housing ( 2 ) extending from a first end ( 3 ) to a second end ( 4 ); a tool ( 9 ); a drive motor ( 5 ) arranged in the housing ( 2 ) between the first end ( 3 ) and the second end ( 4 ), the drive motor ( 5 ) having
a drive shaft ( 7 ) for driving the tool ( 9 ),
a first bearing ( 12 ), and
a second bearing ( 13 ),
wherein the drive shaft ( 7 ) is mounted rotatably ( 11 ) relative to the housing ( 2 ) by means of the first bearing ( 12 ) and the second bearing ( 13 );
a drive transmission unit ( 8 ), the drive transmission unit ( 8 ) being functionally arranged between the drive motor ( 5 ) and the tool ( 9 ); and an additional bearing ( 14 ) arranged on the drive shaft ( 7 ) for supporting the drive shaft ( 7 ) relative to the housing ( 2 ) of the work apparatus ( 1 ).

2 . The work apparatus according to claim 1 ,
wherein the additional bearing ( 14 ) is a floating bearing.

3 . The work apparatus according to claim 1 ,
wherein the additional bearing ( 14 ) is a ball bearing.

4 . The work apparatus according to claim 1 ,
wherein the drive motor ( 5 ) is fastened to the housing ( 2 ) in such a way that the drive motor ( 5 ) is firmly connected to the housing ( 2 ) in a direction of an axis of rotation ( 6 ).

5 . The work apparatus according to claim 1 ,
wherein the drive motor ( 5 ) is fastened to the housing ( 2 ) via an attachment unit ( 15 ).

6 . The work apparatus according to claim 5 ,
wherein the additional bearing ( 14 ) comprises a bearing outer ring ( 16 ) that rests directly on the attachment unit ( 15 ).

7 . The work apparatus according to claim 1 ,
wherein the additional bearing ( 14 ) includes a bearing inner ring ( 17 ) and a bearing outer ring ( 16 ), and wherein a pinion ( 18 ) is co-rotatingly held on the drive shaft ( 7 ) of the drive motor ( 5 ), the pinion ( 18 ) being part of the drive transmission unit ( 8 ).

8 . The work apparatus according to claim 7 ,
wherein the additional bearing ( 14 ) rests with the bearing inner ring ( 17 ) on a receiving section ( 19 ) of the pinion ( 18 ).

9 . The work apparatus according to claim 7 ,
wherein an outer diameter (a) of the bearing outer ring ( 16 ) of the additional bearing ( 14 ) is at least as large as a maximum outer diameter (d) of the pinion ( 18 ).

10 . The work apparatus according to claim 7 ,
wherein the pinion ( 18 ) is prestressed in the direction of an axis of rotation ( 6 ) of the drive motor ( 5 ) by means of a spring unit ( 50 ).

11 . The work apparatus according to claim 1 ,
wherein the drive transmission unit ( 8 ) is designed as a gearing that is free of axial forces.

12 . The work apparatus according to claim 1 ,
wherein the drive transmission unit ( 8 ) has a gear ratio of three.

13 . The work apparatus according to claim 1 ,
wherein the drive motor ( 5 ) comprises a motor housing ( 11 ), wherein the drive shaft ( 7 ) is rotatably mounted within the motor housing ( 11 ) by means of the first bearing ( 12 ) and the second bearing ( 13 ).

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Klett David
• Diehl Heiko
• Junker Sebastian

Classifications

• B25F1/00 Primary

  Combination or multi-purpose hand tools (associations of tools for different working operations with one portable power-drive means B25F3/00; {combined stapling and punching tools B25C5/0214}) · CPC title

• B25F5/00

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• B25F5/001 Primary

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• F16C19/14

  for both radial and axial load · CPC title

• F16C19/54

  Systems consisting of a plurality of bearings with rolling friction (spindle bearings F16C35/08) · CPC title