JPS6230851A - Bearing member for compressor - Google Patents

Abstract

PURPOSE:To maintain the fitness of a bearing member for a rotating shaft and to improve the wear resistance by using a sintered Fe-C-Cu or Fe-Ni-Cr alloy as the material of the bearing part of the bearing member forming the sliding surface kept in contact with the rotating shaft and sintered pure iron as the material of the base part supporting the bearing part. CONSTITUTION:A bearing member 21 bearing the rotating shaft 5 of a compressor is composed of a bearing part 23 forming a sliding surface 22 kept in contact with the shaft 5 and a base part 24 supporting the part 23 fixed on a frame 7. The bearing part 23 is made of a sintered Fe-C-Cu or Fe-Ni-Cr alloy and the base part 24 is made of sintered pure iron.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention 1] The present invention relates to a bearing member used in a compressor, and particularly to a bearing member with improved wear resistance.

[Technical background of the invention and its problems] Figure 7 shows a schematic side cross section of a rotary compressor. As shown in the figure, the rotary compressor 1 has a sealed case 2.
An electric element 3, a compression element 4, etc. are disposed inside, and these are connected by a rotating shaft 5.

The rotating shaft 5 has main bearings 6a and 1i11 that constitute the compression element 4.
The main bearing 6a and the sub-bearing 6b are fixed to the cylinder 7. In the illustrated example, the rotary compressor 1 is 1, and the cylinder 7 is
is integrally molded with the frame 8 and fixed to the closed case 2.

By the way, in the past, the bearing members 6 such as the main bearing 611 or the sub-bearing 6b were generally formed homogeneously from the same metal or spin-sintered metal, as shown in FIG. .

However, the bearing member 6, which is entirely uniformly molded, has the following drawbacks.

(1) The use of cast materials has difficulty in formability, and if preliminary machining is required to provide a discharge valve (not shown) in the bearing member 6, a significant increase in machining costs can be avoided. I can't do it.

(2) If the bearing member 6 is molded using a high-strength material to improve wear resistance, the rotation @ 5 side will be relatively weakened, and the rotation shaft 5 side will be more likely to be damaged ([1].

(3) FQ - (nee CIJ based sintered metal or Fe
If the bearing member 6 is formed using a -Ni-0r based sintered metal, the raw material cost will increase and the material will become hard, so a long polishing time will be required and the processing cost will also increase.

In addition, as a conventional special example, there is a case in which a bushing material 11 made of a different material is embedded in the bearing part 10 forming the bearing sliding surface 9, as shown in FIG. However, it had the following drawbacks:

(1) When phosphor bronze is used for the bushing material 11, the wear resistance at low speed operation (50 to 601-Iz) is improved, but at high-speed operation (130t-Iz or higher), the wear resistance of the rotating shaft 5 is improved. Scuffing and the like occur due to biting of the shaft material, resulting in a significant increase in wear.

(2) On the other hand, if a high hardness material such as ceramic is used for the bushing material 11, the bending strength of the bushing material 11 will decrease and it will become brittle against impact force, and the workability will be poor and a significant increase in cost will be avoided. do not have.

(3) Furthermore, when the bushing 11 made of different materials is used in the shaft bearing part 10, the bushing 11 that holds the bushing 11 is
A problem arose in the bondability with the resting part 12, and the bushing 11 was integrated by press-fitting or shrink-fitting after the base part 128 was molded. There is peace of mind that there is no need to worry, and the yield rate, etc., is above 1.

[Object of the invention 1 The present invention has been created in consideration of the above circumstances,
The purpose is to provide a low-cost bearing member that can improve wear resistance while maintaining compatibility with the rotating shaft.

[Summary of the Invention] In order to achieve the above object, the present invention provides a bearing member that pivotally supports a rotating shaft of a compressor, in which a bearing part that forms a sliding surface with the rotating shaft is provided with an "e-C-CLI" bearing member that supports a rotating shaft of a compressor. The base body for holding the bearing is made of pure iron sintered metal, and the bearing is made of Fe- Cu-based or Fe-
By using wear-resistant Ni-Cr based sintered metal, using soft pure iron sintered metal for the base part, and by composite molding the bearing member with the same type of sintered metal, it is possible to connect it to the rotating shaft. The purpose is to improve the wear resistance of the sliding surface while ensuring the conformability of the shaft, to improve the bonding between the bearing part and the base part, and to suppress the rise in raw material costs, processing costs, etc. as much as possible.

[Embodiments of the Invention] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking a bearing member of a rotary compressor as an example.

First, the schematic structure of the rotary compressor in which the bearing member of the present invention is adopted is as explained in FIG. 7, and FIG. FIG. 2 shows a side sectional view thereof.

As shown in FIGS. 1 and 2, the bearing member 21 that pivotally supports the rotating shaft 5 has a bearing part 23 that forms a sliding surface 22 for supporting the rotating shaft 5, and a frame 7. The main body part 24 is fixed and holds the shaft bearing part 23. The bearing part 23 is made of Fe-C-C14-based or Fe-Ni-Cr-based sintered metal powder and is fired into a cylindrical shape. A body portion 24 is formed around the n) body portion 24 .

The base body part 24 consists of a boss part 25 for holding the shaft bearing part 23 and a flange part 26 fixed to the frame 7.
Those are the raw materials! Sintered iron metal powder is used to form the sinter.

That is, in the present invention, the bearing part 23 is first sintered and formed with a hard Fe-C-C11-based or Fe-Ni-Cr-based wear-resistant sintered metal, and then the outer peripheral side of the bearing part 23 is surrounded. The base body 24 is sintered and formed from soft pure iron sintered metal, and the bearing member 21 is integrally composite molded using the same type of sintered metal, and then the bearing member 21 is final processed into a desired shape and finished. It's Shino.

Further, FIG. 3 shows a side cross section when the bearing member 21 of the present invention is adopted as the sub-bearing 6b.
A flange portion 27 is formed at 1 mm so that the flange portion 27 receives a thrust load of 5 mm.

On the other hand, as illustrated in FIG.
The bondability with 4 may be increased.

Next, let's talk about the effects of the present invention.

First, in the bearing member 21 of the present invention, only the bearing part 23 of the bearing part 23 of the bearing member 22 of the bearing member 22 is made of hard F(II) with high wear resistance.
! -C-CI based sintered metal Y is Fe -Jli -Cr
Since the main body part 24 of the other parts is formed of pure iron sintered metal, the rise in raw material costs can be suppressed as much as possible. In addition, since each of the shaft bearings 22 of the rotating shaft 5 is formed of hard, high-strength metal, the load carrying capacity of the rotating shaft 5 during high-speed rotation is improved, and its wear resistance is improved. Since the base body part 24 holding the is molded from soft pure iron sintered metal, compatibility with the rotation 4 (b5) can be ensured, and the impact resistance will not deteriorate.

In addition, since the bearing part 23 and the base part 24 are made of the same metal, their bonding properties are good and they can be easily precisely molded in a metal state.
! It can be easily processed without causing i11 etc.

Further, the machining steps up to finishing the bearing member 21 are approximately the same as those of the conventional method, and an increase in cost can be suppressed as much as possible.

How to use: In the rotary compression R1 shown in Fig. 7, the cylinder (frame) 7 was conventionally formed into a substantially uniform structure by casting using a sand mold, etc., so it had the following drawbacks. had.

(1) If the cylinder 7 formed with a uniform structure is made of A-leaf 1~, the machinability and workability will improve, but the wear resistance will decrease.

(2) Conversely, if the cylinder tough is made of pearlite or true tie 1 to improve wear resistance,
Machinability deteriorates and post-processing becomes difficult.

Therefore, as shown in Fig. 5, when molding the cylinder 7, it is molded by die casting which can obtain high precision, and during the casting, the inside of the cylinder 7 is placed on the high pressure element side and the low pressure chamber side. A blade groove 2 is formed in this cylinder 7 to slidably accommodate a blade for partitioning the cylinder.
8 is formed under temperature control that is different from other parts, and its sliding surface 29 is made of pearlite (α solid solution-F83C).
(eutectoid) or troostite (fine cementite is dispersed in alpha cast iron), and other non-sliding surfaces are left as they are.

In this way, only the blade groove 28 is
or 1 to loose squid to make it hard (pearlite hardness 1-IB = 125-150, To/L/-style l-hardness HB = 350-400), leaving other parts as soft ferrite. This improves the wear resistance of the blade groove 28 and prevents the blade from seizing. In addition, since the blade groove 28 other than the sliding surface 29 remains a soft cloth, the fit between the blade and the cylinder 7 is improved, and the blade groove etc. The noise is reduced, and the cylinder 7 has excellent machinability and workability. Incidentally, FIG. 6 is a graph comparing the wear characteristics of Fly1 Lite and Barley I-.

In this embodiment, the main bearings 6a and 1iy of the rotary compressor
Although a platform in which the bearing member 21 of the present invention is applied to the bearing 61) has been described, it is of course applicable to bearing members for reciprocating type compressors, scroll type compressors, etc.

[Effect of the Invention 1] In the above-mentioned use, the shaft supporting member of the present invention has only the shaft bearing portion forming the sliding surface with the rotating shaft, which has high wear resistance. 7'
tF (! -C-C1l system or FC-Ni-Cr
It is made of sintered metal, and the base part of the other parts to hold the bearing part is made of soft material. ! Molded with pure iron sintered metal,
Since it is made of the same type of sintered metal material and composite molded, it exhibits the following unique effects.

(1) Since the bearing part and the base part are made of the same metal, they have excellent bonding properties and can be easily precisely formed in the metal state, and there is no risk of peeling etc. when machining oil grooves on the sliding surface. do not have.

(2) Since expensive wear-resistant material is used only in the bearing part, it is possible to suppress the rise in raw material costs as much as possible, and the manufacturing process is almost the same as the conventional one, so the manufacturing cost increases to 1. It is important to keep it as low as possible.

(3) Each spindle of the bearing is made of hard TI high-strength metal, and the base body that holds the bearing is made of soft metal, improving the wear resistance of the IB moving surfaces. Moreover, the compatibility of the rotating shaft is ensured, and the impact resistance does not deteriorate.

[Brief explanation of drawings]

FIG. 1 is a plan view of a preferred embodiment in which the bearing member according to the present invention is adopted as the main bearing of a rotary compressor, FIG. 2 is a side sectional view of FIG. 1, and FIG. 11111 sectional view showing an example in which the bearing member is adopted as a sub-bearing of a rotary compressor, Fig. 4 is a plan view showing a modification of the shape of the joint 81 between the bearing part and the base part, and Fig. 5 shows the molding process of the cylinder. A plan view showing an example, FIG. 6 is a graph comparing the wear characteristics of fly T fly 1 and bar lie 1, and FIG. 7 is a diagram of a rotary compressor.
8 and 9 are side sectional views showing a conventional bearing member. In the figure, 1 is a rotary compressor, 5 is a rotating shaft, 21 is a bearing member, 22 is 1 and a moving surface, 23 is a bearing part, and 24 is a base part. r-z, ;5 Fig. 3 Fig. 4 Fig. 5 Fig. 8 Noon Fig. 6 Fig. 7

Claims (1)

[Claims] In a bearing member that pivotally supports a rotating shaft of a compressor, a bearing part that forms a sliding surface with the rotating shaft is formed of a Fe-C-Cu based sintered metal or a Fe-Ni-Cr based sintered metal. ,
A bearing member for a compressor, characterized in that a base portion for holding the bearing portion is formed of pure iron sintered metal.