JPS62196422A - Bearing device - Google Patents

Abstract

PURPOSE:To improve lubricating performance by forming an oil sumping groove portion pointing in the substantial peripheral direction on a load applying end surface of an oil impregnated bearing in a device where thrust applied to a rotary shaft inserted in the oil impregnated bearing to be supported is born by the end surface of the oil impregnated bearing. CONSTITUTION:In case of applying the titled device to a vertical shaft type motor, a taper cylindrical bearing support portion 13 is formed at the central part of the end surface of a motor frame 11, and an oil impregnated bearing 14 is supported on the above portion 11. The bearing 14 is supported in a stepped cylindrical oil pan case 16 through a felt oil core 15. On the other hand, an annular collar 20 as a load applying portion is fitted to a rotary shaft 19 of a rotor 18, and the collar 20 is supported on the end surface of the oil impregnated bearing 14 through a thrust washer 21. In this case, a plurality of oil sumping groove portions 22 pointing in the substantial peripheral direction are concentrically formed on the end surface of the oil impregnated bearing 14 on the washer 21 side, thereby exerting sufficient lubricating effect to the washer 21.

Description

Detailed Description of the Invention [Objective of the Invention (Industrial Application Field) The present invention provides a bearing device in which a thrust load applied to a rotating shaft inserted through and supported by an oil-impregnated bearing is received by an end face of the oil-impregnated bearing. Regarding.

(Prior Art) For example, in a conventional bearing device for a vertical shaft type motor used in a ceiling ventilation fan, an oil-impregnated bearing 2 is supported at the center of the end face of a frame 1, as shown in FIG. It had a structure in which the rotating shaft 3 was inserted through and supported. As for the thrust load, a thrust washer 5 is interposed between the collar 4 as a load applying part fitted and fixed to the rotating shaft 3 and the end face of the oil-impregnated bearing 2, and this thrust washer 5 is received by the end face of the oil-impregnated bearing 2. By letting
The structure was designed to receive thrust loads. In this case, the end surface of the oil-impregnated bearing 2 that receives the thrust washer 5 was a flat surface.

When the rotary shaft 3 is operated face-to-face, the lubricating oil inside the oil-impregnated bearing 2 leaks onto the sliding surface of the rotary shaft 3 due to the temperature rise of the rotary shaft 3 and the suction effect caused by the rotation of the rotary shaft 3, thereby lubricating the sliding surface of the rotary shaft 3. Further, during this operation, the thrust washer 5 contacts the end face of the oil-impregnated bearing 2 due to the downward thrust load, and rotates at high speed to follow the friction force received from the collar 4 and the rotating shaft 3. However, since the end surface of the oil-impregnated bearing 2 that receives the thrust washer 5 is a flat surface, it is inherently difficult to form a lubricating oil film on this end surface, and the lubrication effect on the thrust washer 5 is insufficient. Become.

For this reason, the frictional resistance between the oil-impregnated bearing 2 and the thrust washer 5 increases, causing relatively large sliding noise between the two, and causing the sliding surfaces of both to wear out in a relatively short period of time. There was a problem that the lifespan was shortened.

(Problems to be Solved by the Invention) According to the conventional configuration described above, the end surface of the oil-impregnated bearing 2 that receives the thrust washer 5 is a flat surface, so the lubricating effect on the thrust washer 5 becomes insufficient. This has caused problems such as increased noise and reduced bearing life.

The present invention is intended to solve these problems, and its purpose is to improve the lubrication effect on the end face of the oil-impregnated bearing on the side that receives the thrust load, thereby reducing noise and extending the life of the bearing. We are here to provide you with the bearing equipment you need.

[Structure of the Invention] (Means for Solving the Problems) The bearing device of the present invention is configured such that the thrust load applied to the rotating shaft is received by the end face of the oil-impregnated bearing via a load applying portion provided on the rotating shaft. In the oil-impregnated bearing, an oil sump groove oriented substantially in the circumferential direction is formed on the end face of the oil-impregnated bearing on the load applying portion side.

(Function) During operation, the lubricating oil seeped from the end face of the oil-impregnated bearing on the load applying part side is collected in the oil sump groove and used to lubricate the end face of the load applying part.

(Embodiment) An embodiment in which the present invention is applied to a vertical shaft type motor will be described below with reference to FIGS. 1 to 4. Reference numeral 11 denotes a motor frame in which a stator 12 is fitted, and a tapered cylindrical bearing support part 13 is formed at the center of the end face of this motor frame. An oil-impregnated bearing 14, which will be described later, is supported on this bearing support portion 13, and an oil core 15 made of felt, for example, impregnated with lubricating oil is disposed around the outer circumference of this oil-impregnated bearing 14 so as to be in contact with the oil-impregnated bearing 14. has been done. The oil core 15 is housed in a stepped cylindrical oil pan case 16 fixed to the inner side of the end surface of the motor frame 11, and the inner peripheral edge of an annular elastic plate 17 provided inside the stepped portion 16a of the oil pan case 16. By bringing the oil-impregnated bearing 14 into pressure contact with the outer peripheral surface of the oil-impregnated bearing 14,
It is pressed on the 3rd side. On the other hand, the rotation shaft 19 of the rotor 18
An annular collar 20 serving as a load applying portion is fitted and fixed to the rotary shaft 19, and the collar 20 and the oil-impregnated bearing 14 are further attached to the rotating shaft 19.
An annular thrust washer 21 is rotatably inserted between the two. In this form, the movement of the thrust washer 21 in the axial direction (upward direction in the figure) is caused by the movement of the collar 2.
Regulated by 0.

The rotating shaft 19, into which the above-mentioned thrust washer 21 is inserted, is inserted and supported by the oil-impregnated bearing 14, and in this supported form, the collar 20 and the thrust washer 21 are located inside the oil receiver case 16, and the rotating shaft 19 is The thrust load applied to the shaft 19 is applied to the collar 20 and the thrust washer 2.
1 at the end face of the oil-impregnated bearing 14.

Now, to explain in detail about the oil-impregnated bearing 14, this oil-impregnated bearing 14 is made by impregnating a porous member such as sintered metal with lubricating oil, and its outer peripheral surface is formed into a spherical shape to allow self-alignment. It makes it seem possible. Furthermore, a plurality of concentric oil sump grooves 22 are formed on the end face of the oil-impregnated bearing 14 on the thrust washer 21 side, as shown in FIGS. The end face as a whole is formed into a wave shape that spreads outward in the radial direction from the center side. In this case, the bottom of each oil sump groove 22 is formed in a concave arc shape with a relatively small radius of curvature, and the portion between each oil sump groove 22 is formed in a convex arc shape that smoothly connects to each oil sump groove 22. has been done. In this embodiment, a similar oil sump groove 22 is formed on the opposite end surface of the oil-impregnated bearing 14 to eliminate the directionality, so that when assembling, it is not possible to place either end surface of the oil-impregnated bearing 14 on the thrust washer 21 side. It is configured so that it can be directed toward the camera, improving ease of assembly.

Next, the operation of the above configuration will be explained. When the rotating shaft 19 rotates, the lubricating oil inside the oil-impregnated bearing 14 leaks onto the sliding surface of the rotating shaft 19 to lubricate it.

Also, during this operation, the downward direction applied to the rotating shaft 19 = 6
- The thrust washer 21 is pressed against the end face of the oil-impregnated bearing 14 by the collar 20 due to the thrust load applied to the collar 20, and in this state, the thrust washer 21
0 and the lY frictional force received from the rotating shaft 19, it rotates to follow these forces. Due to the suction action of the lubricating oil accompanying the rotation of the thrust washer 21, the lubricating oil A inside the oil-impregnated bearing 14 oozes out to the end face on the thrust washer 21 side as shown by the arrow in FIG. This lubricating oil A is uniformly spread in the circumferential direction along each oil sump groove 22 by receiving the rotational force of the thrust washer 21, and is also spread around each oil sump groove 2 by rotational centrifugal force.
The portion between the two can be evenly expanded radially outward. As a result, the lubricating oil A spreads all over between the end face of the oil-impregnated bearing 14 and the thrust washer 21, and an oil film is formed due to its surface tension, and this oil film can exert a sufficient lubricating action on the thrust washer 21. As a result, the frictional resistance between the oil-impregnated bearing 14 and the thrust washer 21 can be significantly reduced compared to the conventional case, and the noise caused by sliding between the oil-impregnated bearing 14 and the thrust washer 21 can be reduced, and the friction between the two can be reduced. Abrasion of the sliding surfaces can be reduced, resulting in a longer life.

In this embodiment, a plurality of oil sump grooves 22 are formed concentrically, and the portion between each oil sump groove 22 is formed into an arcuate convex shape that smoothly connects to each oil sump groove 22 to form an oil-impregnated bearing. 14 is formed in a wavy shape that spreads outward in the radial direction from the center side as a whole, so that the lubricating oil A seeped into each oil sump groove 22 is transferred to each oil sump by the centrifugal force caused by the rotation of the thrust washer 21. The portion between the grooves 22 spreads extremely smoothly outward in the radial direction along the arcuate surface thereof, and the entire portion between the oil sump grooves 22 is covered. Therefore, an oil film is continuously formed over a wide range between the end face of the oil-impregnated bearing 14 and the thrust washer 21, and an extremely high lubrication effect can be expected from this oil film.

In addition, the present invention does not require such a structure to form a continuous oil film, but for example, the number of oil sump grooves is made smaller than that of this embodiment, and the intervals between each oil sump groove are opened. As a result, an annular oil film may be formed separately in a plurality of concentric annular regions corresponding to each oil sump groove and its vicinity, and even with this arrangement, the intended purpose of the present invention can be sufficiently achieved. can be achieved.

Furthermore, the present invention is not limited to a configuration in which the oil sump groove is formed concentrically, but may also be formed by forming one or more grooves connected in a spiral shape and oriented substantially in the circumferential direction. good. In addition, in this embodiment, a thrust washer 21 is provided between the collar 20 (load applying section) and the oil-impregnated bearing 14.
Although the configuration is such that the load applying portion is received by the end face of the face-to-face oil bearing without using the thrust washer, for example, the configuration may be adopted. Alternatively, the oil sump groove may be formed only on one end surface of the oil-impregnated bearing. In addition, the present invention can be modified in various ways without departing from the spirit, such as being applicable to a horizontal shaft type motor.

[Effects of the Invention] 91 As is clear from the above description, the present invention has a structure in which an oil sump groove oriented approximately in the circumferential direction is formed on the end face of the oil-impregnated bearing on the load-applying portion side. The lubricating oil leaking from the end face of the oil-impregnated bearing on the load applying part side can be collected in the oil sump groove, thereby forming an oil film, and this oil film can exert a sufficient lubricating action on the load applying part side,
As a result, it is possible to provide a bearing device that exhibits excellent effects such as low noise and long life.

[Brief explanation of drawings]

1 to 4 show an embodiment in which the present invention is applied to a vertical shaft type motor, in which FIG. 1 is a longitudinal sectional front view of the lower part of the motor, FIG. 2 is a longitudinal sectional front view of an oil-impregnated bearing, FIG. 3 is a plan view of the same, FIG. 4 is an enlarged longitudinal sectional front view of main parts for explaining the operation, and FIG. 5 is a longitudinal sectional front view showing a conventional bearing device. In the drawings, 14 is an oil-impregnated bearing, 19 is a rotating shaft, 20 is a collar (load applying part), 21 is a thrust washer, and 22 is an oil sump groove. Exposure 1 Figure 3

Claims (1)

[Claims] 1. A rotary shaft is inserted into and supported by an oil-impregnated bearing, and a thrust load applied to the rotary shaft is received by an end face of the oil-impregnated bearing via a load application portion provided on the rotary shaft, in which A bearing device characterized in that an oil sump groove portion oriented substantially in the circumferential direction is formed on the end face on the side of the load applying portion.