Speed changer

A technology for variable speed tools and rotating speed, which is applied in the direction of manufacturing tools, gear transmission devices, portable mobile devices, etc. It can solve the problems of complex mechanical structure of gear transmission mechanism and the inability to truly realize the industrialization of automatic gear shifting, so as to avoid tooth punching, The effect of prolonging the service life

Inactive Publication Date: 2010-02-03
POSITEC POWER TOOLS (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned automatic transmission mechanisms realize automatic gear shifting based on the change of the positional relationship between the mechanical structures corresponding to the change of the output torque. This mechanical transmission mechanism not only makes the internal mechanical structure of the gear transmission mechanism more complicated, but also due to the It is also rotating while moving axially, and the housing is relatively fixed, so when the speed change mechanism is shifting, the teeth of the rotating ring gear and the teeth of the anti-rotation device on the housing will collide with each other and it is difficult to meshing, so the purpose of automatic gear shifting and industrial implementation cannot be really realized

Method used

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Embodiment Construction

[0041] refer to Figure 1 to Figure 3b As shown, it is a structural schematic diagram of the first embodiment of the driving device of the variable speed tool control system of the present invention. A variable speed tool 9 includes a motor 2 , a motor power supply 1 , a main switch 13 for starting / stopping the motor, an output shaft 6 and a gear transmission mechanism 4 . The gear transmission mechanism 4 includes a first planetary gear set composed of a first planetary gear 40 and a first planetary carrier, a second planetary gear set composed of a second planetary gear 42 and a second planetary carrier 43, and is fixedly arranged on the tool housing The anti-rotation device 44 and the movable member 45 that can move axially. The driving device 5 is arranged on the gear transmission mechanism 4, and comprises a driving member 52 and a transmission member 51. The driving member of the present embodiment adopts an electromagnet device, including two permanent magnets 521 at a...

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Abstract

The invention discloses a speed changer, comprising a motor, an output shaft, a gear transmission mechanism and a control system, wherein the motor and the output shaft are connected by the gear transmission mechanism; the control system comprises a control unit and a driving device, the driving device is provided with a moving piece which can move between a first position and a second position inthe gear transmission mechanism, and when the moving piece is in the first position and the second position, the output shaft has different output characteristics. When load torque changes to a preset value, the control unit firstly adjusts the torque transferred by the motor to the gear transmission mechanism, and then controls the driving device to realize automatic gear shift. The speed changer of the invention can solve the problem of gear beating in the process of automatic gear shift, the electrical properties are improved, and the service life is also extended.

Description

technical field [0001] The invention relates to a variable speed tool, in particular to a tool driven by a motor with a variable speed transmission mechanism that can output different rotational speeds, such as electric drills, screwdrivers and hammer drills. Background technique [0002] A variable speed tool, such as an electric drill, screwdriver and hammer drill, etc., has a variable speed transmission mechanism that can output different speeds to adapt to different load torques. The speed change transmission mechanism of the speed change tool usually includes a gear transmission mechanism connecting the motor and the output shaft and a control system. The control system changes the transmission ratio by changing the meshing relationship with the gear transmission mechanism, so that the output shaft outputs different speeds. In the prior art, U.S. Patent No. 6,431,289 introduces that the two ring gears in the planetary gear mechanism are arranged to move back and forth a...

Claims

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Application Information

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IPC IPC(8): B25F5/00F16H3/74
Inventor 王家达陈成忠张士松钟红风刘芳世强尼·鲍瑞那图沃伦·布朗保罗·安德罗
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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