KR19980026852U - Retainer for preventing oil leakage of bearing motor - Google Patents

Abstract

The present invention eliminates the pressure difference caused by the high speed rotation of the rotor blades by inserting the oil leakage preventing retainer into the bearing shaft to support the lubrication of the rotating shaft inside the motor. A retainer for bearing oil leakage prevention of a motor that can extend the life of the motor while preventing it from being scattered.In the case of an open type, a disc-shaped oil leakage prevention piece for preventing leakage of bearing oil and at the center of the leakage prevention piece A retainer formed of a rotating shaft insertion hole formed therein and a retainer formed on one side of a bearing formed with a bent portion formed by bending an outer circumference corresponding to the outer shape of the bearing cover to be applied to bearings of both types of openings, thereby preventing oil leakage. Burnout and bearing A very useful designed to extend the service life.

Description

Retainer for preventing oil leakage of bearing motor

The present invention relates to a retainer for preventing leakage of bearing oil in an electric motor, and in particular, an oil leakage preventing retainer is inserted into a rotating shaft of a bearing part to help lubricate the rotating shaft in the motor, thereby preventing a pressure difference caused by high-speed rotation of the rotor blade. The present invention relates to a retainer for preventing leakage of bearing oil in an electric motor, which can extend the life of the motor by preventing the oil from leaking and scattering in the gap of the bearing part.

In general, all rotary machines including electric motors are classified into various types depending on the use of the bearing and the shape of the ball of the bearing as the medium of rotation. It is divided into one open type and an open type.

On the other hand, the bearing is injected with bearing oil to prevent the temperature rise due to the heat of rotation of the ball and smooth the friction.Because the bearing life and the life of the motor are directly related to the bearing life, the structure surrounding the bearing and its shape Very important in structure.

Therefore, the life of the bearing depends on the amount of bearing oil injected into the bearing and the degree of temperature rise of the bearing portion generated while rotating.

The bearing structure of the conventional electric motor constituting the above configuration will be described with reference to FIGS. 1 and 2 as follows.

1 is a half sectional view showing one open bearing of a conventional electric motor, and FIG. 2 is a half sectional view showing both open bearings of a conventional electric motor. Reference numeral 100 denotes an electric motor.

As shown in FIG. 1, a conventional electric motor has a cylindrical rotor 59 and stator 55 into which an annular rotary shaft 58 is inserted, and a frame formed by embedding the rotor and the stator ( 56, an end bracket 53 fastened to one end of the frame, a bearing 50 mounted to an inner diameter surface of the end bracket and supporting one end of the rotation shaft 58, and an outer diameter surface of the rotation shaft 58. It is composed of a bearing cover 52 which is spaced at a predetermined interval and fastened to the main body of the end bracket 53 to surround the bearing.

When voltage is supplied to the stator 55 of the general electric motor 100 having the above configuration, the voltage is induced to the rotor 59 so that the rotor current flows, and is generated by the interaction between the alternating flux and the rotor current. As the rotor 59 rotates by the force, the blade 57 also rotates.

Accordingly, a high pressure rotation of the rotor blade 57 generates a pressure difference with the outside. 1 is a half sectional view showing an open bearing of an electric motor, in which oil in the bearing 50 is leaked and dispersed between oils between the inner and outer rings of the bearing 50 due to the rotational pressure difference of the blades 57 (arrows). Direction). Fig. 2 is a half sectional view showing both open bearings of the motor. As shown in FIG. 2, the bearing cover 52 is installed inside and outside the end bracket 53 to inject oil. It also shows the oil leakage (arrow direction) by the space | interval clearance of the outer diameter surface of the said bearing cover 52 and the rotating shaft 58. As shown in FIG.

On the other hand, in recent years, due to the development of inverter technology, the electric motor is widely used and used for general purposes, and it is a trend that is small and light. Because of this, the cooling method of the rotor by the blade is made as follows.

When the blade rotates at high speed, the pressure inside the blade is further reduced than the pressure outside the blade and inside the bearing, causing a pressure difference between the blade inside and the inside of the bearing cover. As a result, the cooling wind generated by the rotation of the blade enters the inner side of the blade via the inner side of the end bracket, and the cooling wind collides with the stator winding by the centrifugal force of the rotating blade, thereby depriving the stator winding of heat.

However, due to the pressure difference generated by the rotation of the blade, the bearing oil in the bearing is sucked into the blade through the spaced gap between the bearing and the rotating shaft, and then hits the stator core by the centrifugal force of the blade and is attached to the stator winding. Therefore, the stator is burned out due to the deterioration of the stator winding, and the bearing oil of the bearing gradually leaks, and finally the bearing is fixed, thereby increasing the torque of the ball, thereby causing a shot of the coil. There is a problem that is burned out.

Therefore, the present invention was devised in view of the above problems, and its object is to apply a retainer for preventing oil leakage to a bearing of one open type, bearing a retainer having a disc-shaped oil leakage prevention piece having a rotation shaft insertion hole in the center thereof. When formed on one side of the bearing at intervals that do not interfere with the rotation of the bearing, which is larger than the external germicidal size, and when applied to both open bearings, the outer periphery of the outer periphery is large enough to prevent the gap between the inner diameter side of the bearing cover. Retainer for preventing bearing oil leakage in a motor that can be used to extend the life of the motor by installing a retainer having a bent portion bent toward the bearing part to reduce the pressure difference caused by the rotation of the blade and thereby prevent the oil in the bearing from leaking. To provide.

Figure 1 is a half sectional view showing one open bearing of a conventional electric motor

Figure 2 is a half cross-sectional view showing both open bearings of a conventional electric motor.

3 shows a state in which the present invention is applied to the first embodiment,

(A) is a half sectional view of the retainer of the present invention,

(B) is a half sectional view of the motor of the first embodiment used for a bearing of one open type.

4 shows a state in which the present invention is applied to the second embodiment,

(A) is a half sectional view of the retainer applied to the second embodiment of the present invention,

(B) is a half sectional view of the motor of the second embodiment used for both open bearings.

* Description of the symbols for the major symbols in the drawings *

1: retainer 3: insertion hole

4: bend part 6: leakage prevention piece

10, 100: motor 50: bearing

52: bearing cover 53: end bracket

54: stator winding 55: stator

56: frame 57: blade

58: axis of rotation 59: rotor

In order to achieve the above object, a bearing oil leakage preventing retainer of an electric motor according to the present invention includes a disc-shaped oil leakage preventing piece for preventing oil leakage of bearing oil, and a rotation shaft insertion hole formed at the center of the oil leakage preventing piece. It is installed.

Therefore, in the bearing oil leakage preventing retainer of the electric motor of the present invention, the retainer is inserted into the rotating shaft so as to be positioned in the bearing portion, thereby reducing the pressure difference generated by the rotation of the blade during high speed rotation, thereby reducing the oil from the gap between the bearings to the inner side of the blade. This leakage is prevented from being scattered.

In addition to the above configuration, the retainer preferably has a bent portion in which an outer circumferential edge is bent to correspond to the outer shape of the bearing cover in order to be applied to both open bearings.

Therefore, by forming the bent portion of the outer circumferential surface of the bearing oil leakage preventing retainer corresponding to the outer shape of the bearing cover, the pressure difference due to rotation can be reduced.

EXAMPLE

Hereinafter, with reference to the drawings with reference to a preferred embodiment of the bearing oil leakage preventing retainer of the electric motor according to the present invention.

3 shows a state in which the present invention is applied to the first embodiment, (a) is a half sectional view of the retainer of the present invention, and (b) is a half sectional view of the motor of the first embodiment used for a bearing of one open type. For the configuration having the same function as the conventional configuration, the same name and the same reference numerals are used together, and detailed description thereof will be omitted in the configuration description of the present invention in order to avoid the confusing description.

The bearing oil leakage preventing retainer of the motor according to the present invention has a disk-shaped oil leakage preventing piece 6 and an insertion hole 3 for guiding the rotating shaft 58 formed at the center of the oil leakage preventing piece as shown in FIG. 3. Is formed.

It describes the operation and effect of the present invention in this configuration.

First, as the blade 57 rotates to prevent overheating of the stator winding 54, a pressure difference is caused between the blade 57 and the inside of the bearing 50, but the retainer is located close to the gap L of the bearing part. By inserting 1) into the rotary shaft 58, the interference in the pressure inside the motor 10 is not affected, and oil in the bearing is not leaked.

Hereinafter, a second embodiment will be described with reference to FIG. 4.

4 shows a state in which the present invention is applied to the second embodiment, (a) is a half sectional view of a retainer applied to the second embodiment of the present invention, and (b) the motor of the second embodiment used for both open bearings. Half section of.

As shown in FIG. 4, the edge of the outer circumferential surface of the retainer 1 is formed so that the shape of the outer circumference of the retainer 1 having the insertion hole 3 formed at the center thereof corresponds to the outer shape of the bearing cover 52. The bent portion 4 is formed to be inclined to be inserted into the gap L of the inner diameter surface portion of the bearing cover 52 located inside the electric motor 10 so as to be inclined toward the fan shaft of the rotor blade 57. Oil leakage due to the pressure difference in the gap (L) and the inner diameter surface of the bearing cover 52 was not generated.

As described above, the shape of the retainer according to the oil injection form of the bearing is determined by the shape of the retainer when the bearing oil leakage preventing retainer of the motor of the present invention is applied to one of the open bearings and to both of the open bearings. In the case of one type of open bearing, the bearing is formed larger than the outer ring of the bearing to block the pressure difference in the gap of the bearing.In the case of both types of open bearing, the retainer is inclined to correspond to the outer shape of the bearing cover. By forming a bent part to block only the clearance between the bearing cover and the outer diameter of the rotating shaft, it is possible to prevent oil leakage and extend the life of the motor and the bearing.

Claims (2)

A retainer for preventing oil leakage of a bearing motor, comprising: a disk-shaped oil leakage preventing piece for preventing leakage of bearing oil, and a rotation shaft insertion hole formed at the center of the oil leakage preventing piece, and installed on one side of the bearing. The method of claim 1, The retainer has a bearing oil leakage preventing retainer of the electric motor, characterized in that the bent portion formed by bending the outer circumference corresponding to the outer shape of the bearing cover in order to be applied to the bearing of both open types.