JPS60116885A - Bearing structure for enclosed type compressor - Google Patents

Abstract

PURPOSE:To constitute a lubricating oil groove having oil feeding effect by a centrifugal pump effect and reduce manufacturing cost by a method wherein the groove, having tapered rim sections therein, is formed integrally with the lower bearing of the enclosed type compressor. CONSTITUTION:The bearing 4 consists of a cylindrical section 11, having a bearing surface 7 supporting a driving shaft 3, and a flange section 12, to be fixed to a mounting section. In case the bearing 4 is formed integrally by cast iron or the like under employing a forming die, the lubricating oil groove forming die is formed so that the lubricating oil groove 10, having the tapered rim sections 13, 14 expanded toward the upper part in the axial direction of the bearing surface 7, is formed integrally. The oil groove 10 is also arranged so that the lubricating oil, introduced from the opening 5 of the bearing 4 in an oil reservoir chamber 6, is supplied to the upper part of the axial direction by a centrifugal force due to the rotation of the driving shaft 3 and the inclined surfaces of the tapered rim sections 13, 14. The oil feeding may be effected in both of normal and reverse rotations by the tapered rim sections 13, 14.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a bearing structure for a hermetic compressor, and particularly to a bearing that forms a centrifugal pump that transfers lubricating oil by rotation of a rotating shaft on a bearing surface. gQ for the bearing structure of a hermetic compressor that can be formed integrally at the same time as forming the bearing.
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[Technical Background of the Invention] Generally, in a hermetic compressor, as shown in Fig. 1, an electric part (not shown) is installed in the upper part of the case 1, and the lower part is driven by an electric motor. The compression section 2 is numbered. The compression section 2 is configured to be driven by a drive shaft 3 coaxially connected to the output shaft of the electric motor.

A bearing 4 for supporting the drive shaft 3 is provided at the lower end of the drive shaft 3.
is provided. The lower end opening 5 of this bearing 4 is open facing an oil reservoir chamber 6 formed below, and the lubricating oil stored in the oil reservoir chamber 6 can be transferred to
Y611) has been added to 1-Yo+, ll. That is, as shown in FIG. 2, an oil groove 8 extending spirally in the axial direction is provided on the bearing surface 7 of the bearing 4, and the rotational force of the drive shaft 3 that is supported This constitutes a centrifugal pump that transfers the lubricating oil in the oil reservoir chamber 6 upward.

Therefore, lubricating oil is supplied from the oil reservoir chamber 6 to the sliding surfaces of the drive shaft 3 and the bearing 4 along and above them, thereby allowing the drive shaft 3 to rotate smoothly.

``Problems with the background technology'' Therefore, conventional bearings 4 in which a centrifugal pump is formed on the bearing surface 7
The configuration shown in Figure 2 was adopted. As described above, a spiral oil groove 8 is formed in the bearing surface 7 and extends from the oil reservoir side opening 5 facing the oil reservoir chamber 6 to the frontage 9 on the opposite side. Ta. The oil groove 8 was formed by machining on the bearing surface 7 after the bearing 4 was formed.

Forming the spiral oil groove 8 on the bearing surface 7 by machining after once forming the bearing 4 in this way not only requires a complicated processing machine, but also complicates the processing work and increases costs. There is.

[Object of the Invention] Therefore, the present invention was devised to effectively solve the problems of the bearing structure of the conventional closed type I compressor. An object of the present invention is that when molding a bearing, it is possible to integrally mold an oil groove on the bearing surface that achieves a centrifugal pump action at the same time, thereby reducing manufacturing costs as much as possible. The present invention provides a bearing structure for a hermetic compressor.

[Summary of the Invention] In order to achieve the above object, the present invention forms a cylindrical bearing with one end facing one side in the axial direction and being open so as to surround and support the drive shaft. In addition, an oil groove is integrally formed on the bearing surface of the bearing, extending in the axial direction from an opening on one side and gradually expanding to the opening on the opposite side.

[Embodiments of the invention] An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, a cylindrical bearing 4 is formed so as to surround and support the drive shaft 3 (a cylindrical bearing 4 is formed so that one end thereof faces the oil reservoir chamber 6 and has an open frontage 5). This bearing 4 is made of a mold made of cast iron or the like, and integrally includes a cylindrical part 11 having a bearing surface 7 on the inner surface for pivotally supporting a drive shaft, and a flange part 12 for supporting the cylindrical part 11 on a mounting part. The bearing surface 7 also has an oil reservoir chamber 6 along its axial direction.
The lζ oil groove 10 is formed by sequentially expanding and cutting from the opening L1 portion 5 on the side to the frontage portion 9 on the opposite side. In particular, oil groove 1
0 is sequentially enlarged and cut from the oil reservoir chamber 6 side to the opposite side frontage 9, so that the oil groove can be integrally molded into the male mold that forms the cylindrical bearing surface 7. If the male die is removed from the opening 9 after forming, the oil groove 10 can be integrally formed on the bearing surface 7 at the same time.

In addition, the oil groove 10 has both side edges 13 and 14 as shown in FIG.
are formed in a tapered shape and are spaced apart sequentially from the oil reservoir chamber 6 side to the opposite side.

state

As shown in FIG. 4, when the drive shaft 3 is driven to rotate, the lubricating oil rising from the oil reservoir chamber 6 is subjected to centrifugal force as shown by the arrow, forming an oil groove 10 at the tapered edge. 1
4, it will be transported upward along the axial direction. That is,
The oil groove 10, which is gradually enlarged from the frontage 5 on the side of the oil reservoir 6 to the opening 9 on the opposite side, functions as a centrifugal pump to supply lubricating oil. Further, in this embodiment, since both edges 13 and 14 of the oil groove 10 are each formed in a tapered shape, the pumping action can be performed even if the drive shaft 3 rotates in forward and reverse directions.

[Modified Embodiment] FIG. 5 shows a modified embodiment, in which the oil groove 10 formed on the bearing surface 7 of the bearing 4 has one edge 13 parallel to the axis, preferably in a straight line. The other edge 14 is inclined so as to be successively spaced apart from the axis.

Therefore, when the drive shaft 3 rotates forward in the direction of the arrow,
Even if only one oil groove 11 is provided, the oil groove 10 can be formed integrally with the bearing 4 by pulling out the male die from the opening 9 side.

In the above embodiment, the oil reservoir chamber is provided at the bottom, and the drive shaft and the bearing are provided vertically at the top thereof. Of course, it can also be used as a bearing for a model, etc., as long as it is used for transportation.

[Effects of the Invention 1 In summary, the present invention exhibits the following excellent effects.

(1) The oil groove that exerts the centrifugal pump action on the bearing surface can be integrally molded with both bearings, and manufacturing costs can be reduced as much as possible.

(2) Furthermore, the centrifugal pump action can be effectively achieved and the oil supply effect can be maintained constant.

[Brief explanation of drawings]

Figure 1 is a partial schematic sectional view of a hermetic compressor, Figure 2 is a sectional view of a conventional bearing, and Figure 3 is an embodiment of the present invention.
lul+ sectional view, Figure 4 is a side sectional view showing the state of use,
FIG. 5 is a side sectional view showing a modified embodiment of the present invention. In the figure, 3 is the drive shaft, 4 is the bearing, 5 is the oil sump chamber side frontage, 6
9 is an oil reservoir chamber, 9 is an opening on the opposite side, and 1o is an oil groove.

Claims (3)

[Claims] (1) In a bearing structure for a hermetic compressor that bears a drive shaft and transfers lubricating oil from one side along the axial direction onto the bearing surface, one end that surrounds the drive shaft and does not support it. forms an open cylindrical bearing facing the negative side, and is successively enlarged and cut out on the bearing surface of the bearing from the negative side opening to the opposite side opening along the axial direction. A bearing for a hermetic compressor*i characterized by integrally molded oil grooves. (2) The hermetic compressor according to claim 1, wherein the oil groove is formed in a tapered shape that is sequentially enlarged from the opening on one side in the axial direction of the bearing to the opening on the opposite side. Bearing jItJ construction. (3) The bearing structure for a hermetic compressor according to item 2, wherein the oil groove has one edge parallel to the axis and the other edge inclined sequentially with respect to the axis.