Power tool

A technology for electric tools and motors, applied in power tools, manufacturing tools, electric components, etc., can solve problems such as temperature rise of switching elements, and achieve the effects of preventing vibration, improving cooling effect, and improving efficiency

Inactive Publication Date: 2010-06-16
KOKI HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Assuming a brushless DC motor is used, when the number of revolutions of the motor decreases due to the reaction force, a large current may be generated in the drive circuit, thereby causing the temperature of the switching element to rise abnormally

Method used

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Embodiment Construction

[0033] Embodiments according to the present invention will be described below with reference to the drawings. In the following description of the specification of the present invention, an oil pulse tool is used as an example of an electric tool; and the above, below, front, and rear mentioned in the following description are figure 1 Shown above, below, front, rear.

[0034] figure 1 is an overall sectional view of an oil pulse tool according to an embodiment of the present invention. This oil pulse tool 1 uses power supplied from the outside through a power cord 2, uses a motor 3 as a drive source, and uses the motor 3 to drive an oil pulse unit 4 serving as a power transmission mechanism so as to apply rotational force and impact force to On the output shaft 5 connected with the oil pressure pulse unit 4, thereby the rotational impact force is continuously or intermittently transmitted to a front end tool (not shown) such as a quill bit, so as to perform such as screw fas...

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PUM

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Abstract

According to an aspect of the present invention, there is provided a power tool including: a motor that generates a rotational force; a power transmission mechanism that is driven by the motor to transmit the rotational force and that is connected to a bit; and a housing that houses the motor and the power transmission mechanism therein, wherein an electric fan for cooling the power transmission mechanism or the motor is provided inside the housing, wherein the power transmission mechanism, the motor and the electric fan are arranged in this order from front, and wherein the electric fan is disposed at a rear side so as to be interposed between the motor and a back wall of the housing.

Description

technical field [0001] The present invention relates to an electric tool that can be driven and rotated by an electric motor, and more particularly, the present invention relates to an electric tool that has improved durability and improved working efficiency due to an improved cooling mechanism of the electric motor. Background technique [0002] As an electric tool for fastening screws, bolts, etc., there is known an oil pulse tool that uses oil pressure to generate impact force. In oil pulse tools, there are no metal-to-metal collisions. Therefore, compared with mechanical impact tools, oil pulse tools are characterized by low operating noise. As this type of oil pulse tool, for example, JP-2005-040881-A discloses a technology that uses an electric motor as a power source for driving an oil pulse unit, and the output shaft of the motor is directly connected to the oil pulse unit connection. Since the temperature of the oil pulse unit increases during use, a fan is prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25F5/00H02K9/04B25B21/02
CPCB25F5/008B25F5/006B25B21/00B25B21/02
Inventor 西河智雅
Owner KOKI HLDG CO LTD
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