Machine tools, especially hand-held machine tools

A technology for machine tools and driving tools, applied in the field of jigsaws and hand-held machine tools, can solve problems such as increasing frictional resistance and affecting efficiency

Active Publication Date: 2016-06-01
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these sealing lips slide on the rotor shaft and thus increase the frictional resistance, thus adversely affecting the efficiency

Method used

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  • Machine tools, especially hand-held machine tools
  • Machine tools, especially hand-held machine tools
  • Machine tools, especially hand-held machine tools

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Such as figure 1 As shown, the jigsaw 1 has a housing 2 in which are arranged an electric drive motor 3 and a transmission 4 for driving a reciprocating rod 5 on which a saw blade 7 is fastened via a fastening device 6 . On the underside of the housing 2 there is a base plate 8 which bears on the upper side of the workpiece during its machining. The saw blade 7 is arranged in front of the base plate 8 , wherein if necessary a recess can also be provided in the base plate 8 through which the saw blade 7 passes. The saw blade 7 is supported on the rear by a housing-side support device 9 .

[0022] The electric drive motor 3 has a rotor shaft or armature shaft 10 , the longitudinal axis of which is oriented orthogonally to the longitudinal axis of the reciprocating rod 5 . A section of the rotor shaft 10 protruding beyond the stator of the drive motor 3 is mounted rotatably in a ball bearing 11 in the housing, the ball bearing 11 being designed as a deep groove ball bear...

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PUM

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Abstract

The hand-held power tool (1) has electric drive motor (3) and downstream gear box (4). A rotor shaft (10) of the drive motor is mounted in housing (2) via a ball bearing (11). A rotary sealing disk (15) is seated on and connected to rotor shaft, such that the sealing disk is arranged between the ball bearing and a gear component.

Description

technical field [0001] The invention relates to a power tool, in particular a hand-held power tool, such as a jigsaw. Background technique [0002] A hand-held power tool such as a jigsaw has an electric drive motor in a housing, the drive movement of which is converted into a working movement of the tool via a transmission, for example a planetary transmission. In the case of a jigsaw, a reciprocating rod mounted displaceably in the housing is set in a counter-rotating up and down reciprocating movement, to which the saw blade can be coupled. [0003] The rotor shaft of the electric drive motor drives a transmission component and is mounted in the housing via ball bearings. The transmission components are lubricated with transmission grease, wherein in order to avoid the transmission of transmission grease along the rotor shaft of the motor out of the transmission chamber, sealing lips are formed on the ball bearings, the sealing lips should prevent the transmission grease...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23D49/16B23D51/16B25F5/00
CPCB23D51/16B25F5/001
Inventor G·普罗布斯特D·泽格塞尔
Owner ROBERT BOSCH GMBH
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