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Speed change tool

A technology of variable speed tools and tools, which is applied in the direction of manufacturing tools, striking tools, motor tools, etc.

Active Publication Date: 2012-03-28
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

[0047] 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 change tool which comprises a motor, an output shaft, a gear transmission mechanism connected with the motor and the output shaft and a control system, wherein the control system comprises a control unit and a driving device, and the driving device is provided with a moving piece capable of moving between a first position and a second position in the gear transmission mechanism. When the moving piece is positioned at the first position and the second position, the output shaft has different output characteristics; and when a load torque is changed to a preset value, the control unit firstly adjusts the torque transmitted by the motor to the gear transmission mechanism and then controls the driving device to realize automatic gear shifting. The speed change tool can solve the problem of tooth beating generated in the process of the automatic gear shifting, thereby improving the electrical property of the tool and prolonging the service life of the tool.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H3/74
CPCF16H2200/2035F16H61/0213F16H63/50B23B45/008F16H59/14B25F5/001B25B21/008B25D16/003
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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