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Speed changing tool and speed changing control method thereof

A technology of a speed change tool and a control unit, which is applied in the field of speed change control of this type of speed change tool, can solve the problems such as the inability to truly realize the industrialized implementation of automatic shifting and the complex mechanical structure of the gear transmission mechanism.

Active Publication Date: 2009-03-04
POSITEC POWER TOOLS (SUZHOU) CO LTD
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  • 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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  • Speed changing tool and speed changing control method thereof
  • Speed changing tool and speed changing control method thereof
  • Speed changing tool and speed changing control method thereof

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Embodiment Construction

[0038] Reference Figure 1 to Figure 3b Shown is a schematic structural 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 consisting of a first planetary gear 40 and a first planet carrier, and a second planetary gear set consisting of a second planetary gear 42 and a second planet carrier 43, which are fixedly arranged in the tool housing The upper rotation stop device 44 and the movable member 45 that can move axially. The driving device 5 is arranged on the gear transmission mechanism 4, and includes a driving part 52 and a transmission part 51. The driving part of this embodiment adopts an electromagnet device, which includes two permanent magnets 521 spaced apart at ...

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Abstract

The present invention discloses a gear shifting tool, and comprises a motor, an output shaft, a gear transmission mechanism connecting the motor and the output shaft and a control system. The control system comprises a control unit and a driving device; the driving device is provided with a movable component which can move between a first position and a second position in the gear transmission mechanism; and when the movable component is arranged in the first position and the second position, the output shaft has different output characteristics. When the load torque is changed into the preset value, the control unit first regulates the torque transmitted to the gear transmission mechanism from the motor, and then controls the driving device to realize the automatic gear shifting. The present invention can solve the mis-engagement problem in the automatic gear shifting process, improves the electrical performances of the tool, and prolongs the service life of the tool.

Description

Technical field [0001] The invention relates to a variable speed tool, in particular to a tool with a variable speed transmission mechanism driven by a motor that can output different speeds, such as electric drills, screwdrivers, and hammer drills. The invention also relates to a speed control method of this type of variable speed tool. Background technique [0002] A variable speed tool, such as an electric drill, a screwdriver, and a hammer drill, has a variable speed transmission mechanism that can output different speeds to adapt to different load torques. The transmission mechanism of a transmission tool usually includes a gear transmission mechanism and a control system connecting the motor and the output shaft. The control system changes the transmission ratio by changing the meshing relationship with the gear transmission mechanism, so that the output shaft can output different speeds. In the prior art, U.S. Patent No. 6431289 introduces that the two ring gears in the pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/44F16H59/02F16H61/00B25F5/00B23B47/14B23B45/02B25B21/00B25D16/00
Inventor 王家达陈成忠张士松钟红风强尼·鲍瑞那图沃伦·布朗
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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