JPH083157Y2 - Sintered oil-impregnated bearing structure of electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a sintered oil-impregnated bearing structure for an electric motor.

[Prior Art] FIG. 6 shows a sintered oil-impregnated bearing structure of a conventional electric motor described in Japanese Patent Application No. 62-164034. A rotor shaft 6 is press-fitted into a cylindrical sintered oil-impregnated bearing (hereinafter referred to as a sleeve bearing) 5 and fixed by a bearing stand 4 of a case 7. Bearing stand 4
The rotor 1 is attached to the tip of the more protruding rotor shaft 6. A felt ring 3 and a washer 2 are provided on the blade side of the bearing base 4. The other end of the rotor shaft 6 has a washer
8, 9, 10 and a clip ring 11 are attached, and a cap 12 is fitted on the base of the bearing stand 4.

[Problems to be Solved by the Invention] As shown in FIG. 6, in the conventional sleeve bearing structure, only the felt ring 3 and the washer 2 are provided on the vane side of the bearing base 4 to prevent the oil from leaking out. When the rotor shaft 6 rotates, the lubricating oil in the sleeve bearing 5 expands due to frictional heat and seeps out to lubricate the rotor shaft 6 and the bearing interior. However, the oil flows along the rotor shaft 6 and flows out from the bearing portion.

That is, as shown by the arrow in the oil flow path, when the rotor shaft 6 rotates, the oil contained in the sleeve bearing 5 exudes due to thermal expansion and transmits the rotor shaft 6 to the felt ring 3. The oil that has been absorbed and still collects in the hatched portion shown in the figure, and then flows out through the gap between the rotor 1 and the bearing base 4 to the rotor 1. Therefore, oil shortage occurs in a short time, seizure due to large friction between the rotor shaft 6 and the sleeve bearing 5 and wear of the inner diameter of the sleeve bearing 5 become remarkable, resulting in a decrease in rotation speed and abnormal noise. It was Further, in order to prevent the oil from flowing out, it is sufficient to reduce the clearance a between the rotor 1 and the bearing base 4, but considering the runout of the rotor shaft 6 and the like,
There is a manufacturing problem.

The present invention has been provided in view of the above points,
Provided is a sintered oil-impregnated bearing structure for an electric motor, which is intended to realize a long life of a sleeve bearing with a simple structure.

[Means for Solving the Problems] In the present invention, the rotor shaft is supported by a sintered oil-impregnated bearing, and the sintered oil-impregnated bearing is fixed from the outside by a bearing stand formed on the case side. The washer is press-fitted inside the bearing stand and is positioned so as to be located on the end surface of the sintered oil-impregnated bearing, and the slinger for oil outflow prevention with the oil reservoir groove formed on one end side of the rotor shaft is press-fitted and fixed. Further, a labyrinth formed so as to cover the slinger is press-fitted into the bearing base, a felt ring and a washer are provided at the other end of the rotor shaft, and the opening of the case on the other end side of the rotor shaft is sealed with a cap. It was done.

[Operation] Therefore, the oil from the sintered oil-impregnated bearing is suppressed by a washer,
The slinger that rotates with the rotor shaft prevents the oil flowing out through the washer from flowing out, and the oil that reaches the inside of the slinger and accumulates in the groove is shaken off by the centrifugal force generated by the rotation of the slinger. In addition to circulating the oil, the labyrinth lengthens the oil outflow route to prevent oil outflow, and the slinger that rotates with the rotor shaft prevents the oil from flowing to the case side. The outflow is prevented and the oil accumulated on the cap side is circulated by the rotation of the rotor shaft.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The structure on the blade side through the sleeve bearing 5 is as shown in FIGS. 1 and 2, in which a washer 15 having an inner diameter larger than the rotor shaft 6 by about 0.1 mm is inserted into the bearing stand 4 by press fitting.
It is located on the end surface of the sleeve bearing 5. This is because when the rotor shaft 6 rotates, the washer 15 is brought into close contact with the oil coming out of the rotor shaft 6 so as to suppress it even a little. After inserting the washer 15, a slinger 14 having a ring-shaped groove 21 on the washer 15 side as shown in FIG. 5 is inserted into the bearing base 4. Then, the labyrinth 13 as shown in FIG. 4 is press-fitted into the bearing base 4, the rotor shaft 6 is press-fitted, and the integrated rotor block is inserted.

The slinger 14 has the following functions.

By press-fitting into the rotor shaft 6 and the rotor 1, the oil that directly travels along the rotor shaft 6 and tries to flow out to the rotor 1 side is stopped. That is, the oil outflow route is lengthened.

The rotor shaft 6 and the slinger 14 rotate at the same time,
14 Centrifugal force shakes off the oil that has reached the inside and accumulated in the groove 21 to circulate the oil.

The gap between the slinger 14 and the inner peripheral surface of the bearing stand 4 is set to about 0.1 mm to prevent oil from leaking out. Further, the lab rinse 13 prevents the oil from leaking out.

Next, the structure on the case 7 side via the sleeve bearing 5 is as follows. First, in order to absorb the oil flowing to the case 7 side by the slinger 14, as shown in FIGS. 1 and 3, the felt ring 16 is positioned on the end face side of the sleeve bearing 5, and this is washer (SUS) 17 Press to position the felt ring 16 and reduce wear of the cut washer 19 of the polyslider used for the retaining ring with the washer 18 of Luron, which has excellent wear resistance.
The molded case 7 side has a cap made of an aluminum plate.
20 is press-fitted. By press-fitting the cap 20, the inside of the sleeve bearing 5 is sealed, but a seal label is further attached on the cap 20.

Then, when the rotor shaft 6 rotates, the lubricating oil in the sleeve bearing 5 tends to flow to the blade side.
Therefore, the oil tends to extend to the case 7 side. Since the oil flowing to the case 7 side is sealed by the cap 20, an oil collecting chamber is formed between the oil and the sleeve bearing 5, and the oil collecting there flows as shown by the arrow in FIG. . Therefore,
An oil circulation path is formed inside the sleeve bearing, and oil is always in good circulation between the rotor shaft 6 and the sleeve bearing 5.

[Effects of the Invention] As described above in the present invention, the rotor shaft is supported by the sintered oil-impregnated bearing, and the sintered oil-impregnated bearing is fixed from the outside by the bearing stand formed on the case side. The washer is press-fitted inside the bearing stand and is positioned so as to be located on the end surface of the sintered oil-impregnated bearing, and the slinger for oil outflow prevention with the oil reservoir groove formed on one end side of the rotor shaft is press-fitted and fixed. Further, a labyrinth formed to cover the slinger is press-fitted into the bearing base, a felt ring is provided on the other end of the rotor shaft, and the opening of the case on the other end side of the rotor shaft is sealed with a cap. Therefore, the oil from the sintered oil-impregnated bearing is suppressed by the washer, and the outflow of the oil flowing through the washer to the outside is prevented by the slinger that rotates with the rotor shaft. The oil that collects in the groove The oil is circulated by being shaken off by the centrifugal force generated by the rotation of the moth, and the labyrinth lengthens the oil outflow route to prevent oil outflow.Furthermore, the slinger caps the oil that is about to flow to the case side. This prevents the oil from flowing out to the outside and circulates the oil accumulated on the cap side by the rotation of the rotor shaft.Therefore, the oil impregnated in the sintered oil-impregnated bearing or the felt ring may be impregnated with oil. Oil that does not flow out from the inside of the bearing stand to the outside, improves circulation between the rotor shaft and the sintered oil-impregnated bearing, eliminates seizure of the bearing, and has the effect of extending the service life. Is.

[Brief description of drawings]

1 is a sectional view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an essential part of the same, FIG. 3 is an enlarged sectional view of an essential part of the same, and FIGS. 4 (a) and 4 (b) are labyrinths of the same. Sectional view and bottom view of
5 (a) and 5 (b) are a sectional view and a bottom view of the above slinger, and FIG. 6 is a sectional view of a conventional example. 4 is a bearing stand, 5 is a sintered oil-impregnated bearing, 6 is a rotor shaft, 7 is a case, 14 is a slinger, 15 is a washer, 16 is a felt ring, 17 is a washer, and 20 is a cap.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Takeo Hirai Inventor Takeo Hirai 1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works, Ltd. (56) References JP-A-55-106051 (JP, A) JP-A-55-63546 ( JP, A)

Claims (1)

[Scope of utility model registration request] 1. In a sintered oil-impregnated bearing structure for an electric motor, wherein a rotor shaft of an electric motor is supported by a sintered oil-impregnated bearing, the rotor shaft is supported by the sintered oil-impregnated bearing, and a bearing stand formed on the case side is used. Fix the sintered oil-impregnated bearing from the outside, press-fit a washer inside the bearing stand on one end side of the rotor shaft, position it on the end face of the sintered oil-impregnated bearing, and place it on one end side of the rotor shaft for oil sump. Oil-spill prevention slinger with a groove formed in it is press-fitted and fixed, and a labyrinth formed to cover the slinger is press-fitted into the bearing base.A felt ring and a washer are installed at the other end of the rotor shaft, and A sintered oil-impregnated bearing structure for an electric motor, wherein an opening of a case on the other end side of the slave shaft is sealed with a cap.