Speed changeable motor for power tool

A technology of power tools and electric motors, applied in the field of portable power tools, can solve the problems of reducing the overall length of the drilling machine and having no space to meet the requirements

Inactive Publication Date: 2007-02-07
JOHNSON ELECTRIC SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this approach does a good job of aligning the motor with the gearbox, it leaves little room for the current market demand for a smaller overall length of the drill

Method used

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  • Speed changeable motor for power tool
  • Speed changeable motor for power tool
  • Speed changeable motor for power tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] figure 1 Indicates a motor / gearbox combination for a portable power tool such as a drill or electric screwdriver. The combined device has a small overall length. The assembly is divided into two parts, namely: a motor part 11 and a gearbox part 12 comprising an output part 13 .

[0017] The motor section 11, shown on the right, contains a DC motor with a permanent magnet stator and a wound rotor. The rotor comprises a shaft 14 , a rotor core 15 and a rectifier 16 mounted on the shaft 14 , with rotor windings 17 wound around the rotor core 15 and ending in the rectifier 16 .

[0018] The stator 18 includes permanent magnets placed in a tubular casing 19 . A throttle end cap 20 closes off the right hand end of the tube 19 . The throttle cover 20 is made of an insulating synthetic resin and supports bearings 21, brush units 22 and terminals (not shown) of the motor. Bearing 21 is a self-aligning oil soaked sintered bronze bushing into which one end of the rotor shaft ...

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PUM

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Abstract

A compact gearbox / motor combination for a portable power tool has a single partition plate 23 closing an end of the gearbox housing 24 and the motor housing 19. A shaft 14 of the motor is joumalled at one end in a self-aligning bearing 21 supported by an end cap 20 of the motor. The other end of the motor shaft 14 is journalled in a hole 41 in a gear carrier 29 of the gearbox.

Description

technical field [0001] The invention relates to a portable power tool, in particular to a motor and a gearbox for the portable power tool. It is particularly suitable for portable hand-held drilling machines, the invention will be explained below. Background technique [0002] Portable, hand-held tools, such as drills, are powered by electric motors powered by batteries or power lines. In order to increase the output torque of the drilling machine, the motor drives the drill bit through a set of reduction gear transmission mechanism. In order to keep the size of the drilling machine small and obtain maximum drilling force, it is best to use a planetary gearbox. [0003] Currently, manufacturers of drilling machines can obtain an electric motor and a separate gearbox with an output shaft. Use a special adapter plate to connect the motor and gearbox together, and then assemble the combined motor and gearbox into the casing of the drilling machine. While this approach does ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K7/116B23B45/02B25F5/00F16H1/28
CPCF16H1/46B25F5/001
Inventor 邓锦波
Owner JOHNSON ELECTRIC SA
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