KR20160073548A

KR20160073548A - Motors for machine tools

Info

Publication number: KR20160073548A
Application number: KR1020140181976A
Authority: KR
Inventors: 김기식
Original assignee: 김기식
Priority date: 2014-12-17
Filing date: 2014-12-17
Publication date: 2016-06-27

Abstract

The present invention relates to a motor for a machine tool,
housing;
A shaft inserted through the housing;
A rotor coupled to enclose the shaft;
A stator coupled to the inside of the housing to be disposed outside the rotor;
A bearing interposed between the housing and the shaft to rotatably support the shaft; And
And insulation means for preventing conduction between the housing and the shaft.
The motor for a machine tool according to the present invention can prevent the occurrence of sparks between a cutting tool mounted on a shaft and an object to be machined by preventing the conduction between the housing and the shaft by the insulating means, There is an effect that the damage of the object due to the spark can be prevented.

Description

[0001] DESCRIPTION [0002] Motors for machine tools [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a motor for a machine tool, and more particularly, to a motor for a machine tool capable of preventing a spark from occurring between a cutting tool mounted on a shaft and a workpiece by inserting a shaft of the motor for the machine tool.

Generally, various machine tools are provided with a motor for rotating a cutting tool.

In this case, the cutting tool is mounted on the shaft of the motor by a fixing device such as a chuck to process the object. When a conventional motor for a machine tool is used, a spark is generated between the cutting tool and the object due to the current flowing through the shaft There is a problem that occurs.

Such a spark is particularly required to insulate the shaft of a motor in order to prevent fatal damage to an object requiring precise and clean machining such as a window glass or a substrate for a mobile device.

KR, A, No. 10-2012-0044511 (2013.05.08.) KR, Y1, No. 20-0206586 (December 1, 2000).

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

And it is an object of the present invention to provide a motor for a machine tool capable of preventing a spark from occurring between a cutting tool mounted on a shaft and an object to be machined by insulating the shaft.

According to an aspect of the present invention, there is provided a motor for a machine tool,

housing;

A shaft inserted through the housing;

A rotor coupled to enclose the shaft;

A stator coupled to the inside of the housing to be disposed outside the rotor;

A bearing interposed between the housing and the shaft to rotatably support the shaft; And

And insulating means for preventing conduction between the housing and the shaft.

In the motor for a machine tool according to the present invention,

Since the conduction between the housing and the shaft is prevented by the insulating means, it is possible to prevent the occurrence of sparks between the cutting tool mounted on the shaft and the object to be machined, thereby preventing the object from being damaged by the spark There is an effect that can be.

1 is a side cross-sectional view of a motor for a machine tool according to an embodiment of the present invention;
2 is a front sectional view showing a coupling structure of a shaft and a first insulation coating in a motor for a machine tool according to an embodiment of the present invention.
3 is a side cross-sectional view of a motor for a machine tool according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3, a motor for a machine tool according to an embodiment of the present invention includes a housing 100, a shaft 200, a rotor 300, a stator 400, a bearing 500 And insulating means.

The housing 100 includes a cylindrical body 110 and a front cover 120 and a rear cover 130 coupled to the front and rear ends of the body 110, (300), the stator (400), and the bearing (500).

The shaft 200 is inserted to pass through the center of the housing 100.

A chuck or the like for fixing the cutting tool is mounted on the front end of the shaft 200.

A hollow 220 penetrating the center of the shaft 200 is formed in the shaft 200 and a helical connection part 240 is formed on the inner wall of the rear end of the hollow 230 for connection with the cutting oil supply part.

A pipe of the cutting oil supply part is screwed to the coupling part 240 so that cutting oil and cutting oil can be supplied to the cutting tool and the object through the hollow part 220.

According to this structure, since the shaft 200 performs a function of a pipe for supplying cutting oil, it is possible not only to supply the cutting oil to the cutting tool and the object to be processed easily, but also to cool the motor by using the cutting oil .

As shown in FIG. 3, the shaft 200 is provided with a projection 230 projecting along the inner wall of the hollow 230 so that the cutting oil flowing into the hollow 220 can be more smoothly supplied by the rotational force of the shaft 200. [ A spiral discharge inducing portion 240 may be formed.

The rotor 300 is composed of a permanent magnet and is disposed inside the housing 100, and is coupled to surround the shaft 200.

The stator 400 includes a stator core 410 and a stator coil 420 wound around the stator core 410. The stator 400 is disposed inside the housing 100 so as to be disposed outside the rotor 300 Lt; / RTI >

The bearing 500 is interposed between the housing 100 and the shaft 200 and includes an outer ring 510 inserted into the inner circumferential surface of the housing 100, an inner ring 520 fitted to the outer circumferential surface of the shaft 200, And a plurality of rolling bodies 530 interposed between the outer ring 510 and the inner ring 520.

The bearing 500 is interposed between the front cover 120 and the shaft 200 and between the rear cover 130 and the shaft 200 to rotatably support the shaft 200.

The insulating means is for preventing conduction between the housing 100 and the shaft 200, and may be provided by various means.

First, the insulating means may be provided by each rolling member 530 of the bearing 500 being made of a non-conductive material.

That is, each rolling member 530 of the bearing 500 is made of an insulating material such as ceramics or synthetic resin, so that current flowing to the shaft 200 through the housing 100 and the bearing 500 can be cut off.

And the insulation means may comprise a first insulation sheath 600 interposed between the shaft 200 and the bearing 500, as shown in FIGS. 1 and 2.

The first insulating sheath 600 may be formed by coating a coating of insulating material on the outer circumferential surface of the shaft 200 facing the bearing 500 or by inserting a cylindrical insulating tube, The current flowing to the shaft 200 through the housing 100 and the bearing 500 can be cut off as in the case of the moving body 530. [

2, the first insulation coating 600 includes a plurality of fixing protrusions 610 which are arranged radially around the inner circumference and protrude to extend along the width direction of the first insulation coating 600, And a plurality of fixing grooves 210 are formed on the outer circumferential surface of the shaft 200 in contact with the first insulation coating 600 so that the fixing protrusions 610 enter and engage with each other.

According to such a structure, the first insulating sheath 600 is fixed to the shaft 200 by a method such as spline or serration so that a more rigid coupling force with respect to the rotation direction of the shaft 200 .

As shown in FIG. 1, a second insulation coating 700 having a structure similar to that of the first insulation coating 600 may be formed on the front end of the shaft 200.

That is, the second insulating sheath 700 may be formed by coating a coating of an insulating material on the outer peripheral surface of the front end of the shaft 200, or by inserting a cylindrical insulating tube, Thereby preventing conduction between cutting tools mounted on the tool 200.

As a result, since the conduction between the housing 100 and the shaft 200 is prevented by the insulating means, the motor for a machine tool according to the present invention having the above-described structure can prevent the spark between the cutting tool mounted on the shaft 200 and the workpiece, Therefore, it is possible to prevent the object from being damaged by the spark during the machining operation of the object using the machine tool.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those precise embodiments, and various modifications and changes may be made thereto by those skilled in the art. And should be construed as falling within the scope of protection of the invention.

100; housing
110; body
120; Front cover
130; Rear cover
200; shaft
210; Fixing groove
220; Hollow
230; Engaging portion
240; The discharge inducing portion
300; Rotor
400; The stator
410; Stator core
420; Stator coil
500; bearing
510; paddle
520; Inner ring
530; Rolling body
600; The first insulation coating
610; Fixation projection
700; The second insulation coating

Claims

A housing (100);
A shaft (200) inserted to penetrate the housing (100);
A rotor 300 coupled to enclose the shaft 200;
A stator 400 coupled to the inside of the housing 100 to be disposed outside the rotor 300;
A bearing 500 interposed between the housing 100 and the shaft 200 to rotatably support the shaft 200; And
And an insulating means for preventing conduction between the housing (100) and the shaft (200).

The method according to claim 1,
The bearing 500 includes an outer ring 510 inserted into the inner circumferential surface of the housing 100, an inner ring 520 fitted to the outer circumferential surface of the shaft 200, And a plurality of rolling elements 530 interposed therebetween,
Wherein the insulation means is provided by the respective rolling elements (530) being made of non-conductive material.

The method according to claim 1,
Wherein the insulation means comprises a first insulation coating (600) interposed between the shaft (200) and the bearing (500).

The method of claim 3,
A plurality of fixing protrusions 610 protruded to extend along the width direction are formed in the first insulation coating 600 radially along the inner circumferential surface,
Wherein a plurality of fixing grooves (210) are formed on an outer circumferential surface of the shaft (200) in contact with the first insulation coating (600) so that the fixing protrusions (610) enter and engage with each other.

The method of claim 3,
And a second insulation coating (700) surrounding the outer peripheral surface of the front end of the shaft (200).

6. The method according to any one of claims 1 to 5,
The shaft (200) has a hollow (220) penetrating the center thereof,
And a spiral engagement portion (230) is formed on an inner wall of a rear end portion of the hollow (220) for connection with a cutting oil supply portion.

The method according to claim 6,
Wherein the shaft (200) is formed with a spiral discharge guide portion (240) protruding along the inner wall of the hollow (220).