JPS5845636B2 - Manufacturing method of thrust bearing for compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method of manufacturing a bearing that receives a thrust load and is used in a compressor body having a vertical rotating shaft.

[Prior art]

A conventional relatively small hermetic electric compressor will be explained with reference to FIG.

The motor section 1 is roughly divided into the upper part and the compression mechanism part 2 is arranged at the lower part, and these parts are connected by a rotating shaft 3.

The thrust bearing 4 is attached to the lowest part of the compression mechanism section 2, and is fixed to the lower bearing 5 with bolts.

The thrust bearing 4 receives normal force due to the weight of the rotating shaft 3 and the rotor 1a attached to the rotating shaft 3, and the suction force generated due to misalignment of the magnet centers of the rotor 1a and stator 1b. In addition, the function includes a function to undergo rotational sliding due to the rotation of the rotary shaft between the thrust surface 3a at the lower end of the rotary shaft 3, and a function to guide lubricating oil stored in the lower part of the compressor body to the oil hole 3b of the rotary shaft 30. It has the following.

A conventional thrust bearing 4 will be explained with reference to FIG.

FIG. 2 1 shows the state seen from the side of the sliding surface 4a with respect to the rotating shaft, and FIG. 2 2 shows the state seen from the side of the non-sliding surface.

As is clear from FIG. 2, the thrust bearing 4 has a bolt hole 4b for mounting to the lower bearing 5, and an oil supply hole 4c having a dish-shaped portion that communicates with the oil supply hole 3b provided at the center of the rotating shaft 3.
and an oil supply hole 4d having a hole diameter equal to or less than the plate thickness of the crust bearing 4 and communicating with an oil supply groove (not shown) provided on the outer periphery of the rotating shaft 3.

Next, a method of manufacturing the conventional thrust bearing 4 will be explained with reference to FIG.

First, as shown in Fig. 3 1, the bolt hole 4b and the oil supply hole 4c are punched out into a predetermined shape as shown in Fig. 3 1, and then the bolt hole 4b and the oil supply hole 4c are formed by press punching, as shown in Fig. 3 3-4. Finish holes 4c and 4d by machining.

After that, the usual method is to perform heat treatment or the like as necessary, and further polish the sliding surface 4a of the rotating shaft 3 to complete the process.

However, these conventional manufacturing methods require machining steps, making it difficult to shorten the machining time, and also pose various problems regarding the disposal of chips from removed parts and the workplace environment.

As a result, manufacturing costs soared, which in turn led to an increase in compressor manufacturing costs.

[Purpose of the invention]

The present invention has been made based on this point, and an object of the present invention is to enable an oil supply hole with a diameter smaller than the plate thickness by press working.

[Summary of the invention]

The present invention provides a method for manufacturing a thrust bearing 4 which is subjected to a load due to the weight of each component constituting the compressor body, and which is also subjected to rotational sliding at each end of the rotating shaft. After pressing the passing oil supply hole 4d with a diameter larger than the plate thickness, a stage is formed having a small diameter part 7b having an outer diameter smaller than the plate thickness of the thrust bearing 4 and a large diameter part 7a having an outer diameter larger than the oil supply hole 4d. The thrust bearing 4 is compressed with a punch 7 into the oil supply hole 4d, and the portion of the thrust bearing 40 crushed by the large diameter portion 7a is transferred to the periphery of the small diameter portion 7b by movement of the steel structure. This is a method for manufacturing a thrust bearing for a compressor, characterized in that the oil supply hole 4d has a diameter smaller than the plate thickness.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6.

The manufacture of the thrust bearing 4 is completed by the press operation shown in FIG. 4 (1-3).

That is, first, after cutting the outer shape from a strip material etc. as shown in Fig. 4, holes with diameters larger than the plate thickness of the thrust bearing 4 are drilled in the parts corresponding to the bolt holes 4b and the oil supply holes 4c>4d. 4. Press out as shown in FIG. 2.

Next, as shown in FIG. 4, they are pressed into the required diameters or shapes.

As long as the mold can be manufactured, each hole (especially the oil supply holes 4c and 4d in this S) can be molded simultaneously in one process.

A method of forming a hole having an inner diameter smaller than the plate thickness of the thrust bearing 4 will be explained in detail with reference to FIG.

4. Press-forming is performed using a stepped punch 7 into a prepared hole shown by a two-dot broken line that has been punched to the minimum diameter that can be punched out in the step shown in FIG. 2.

This stepped punch I has a small diameter portion 7b whose tip end has an intended oil supply hole size smaller than the plate thickness, and an upper portion thereof has a large diameter portion 7a which has a larger diameter than the press hole diameter.

By pressing the stepped punch 7, the entire inner portion crushed by the large diameter portion 8a is transferred to the vicinity of the small diameter portion 7b by movement of the steel structure, and it is possible to form the oil supply hole 4d with a minimum inner diameter dimension smaller than the plate thickness.

In both of these methods, the desired lubrication hole shape is obtained by moving the steel structure based on the accuracy of pilot hole punching, and the impact load applied at the time of hole punching is small, and the plastic forming load of the steel structure is relatively small. Therefore, there are fewer accidents such as damage or breakage of the punch itself, and stable production is possible by accurately selecting the pilot hole dimensions, punch design, and press stroke based on the final shape.

In addition, as shown in Figure 5, the part from the large diameter part of the pan differential to the small diameter part that determines the oil supply hole size is arc-shaped, so the flow resistance of the lubricating oil is such that it flows smoothly as shown by the arrow in Figure 6. The lubricating oil flow characteristics are improved.

〔Effect of the invention〕

According to the present invention, the oil supply hole having a diameter smaller than the plate thickness of the thrust bearing can be manufactured by high-speed pressing.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional compressor, Fig. 2 is a perspective view showing a thrust bearing used in the compressor shown in Fig. 1, and Fig. 3 is a perspective view showing the manufacturing process of the thrust bearing.
Fig. 4 is a perspective view showing the manufacturing process of the thrust bearing of the present invention, Fig. 5 is a detailed side sectional view of the manufacturing process of the irregular hole shape of the bearing shown in Fig. 4, and Fig. 6 is the thrust bearing according to the present invention. FIG. 3 is a side sectional view showing the flow of oil when the lubricating oil flows through the oil supply hole. 1...Electric motor section, 1a...Rotor, 1
b... Stator, 2... Compression mechanism section, 3
...Rotating shaft, 3a... Thrust surface of the rotating shaft, 3b... Oil filling of the rotating shaft, 4...
Thrust hair link, 4a... Sliding surface of thrust bearing 40 rotating shaft 3, 4b... Bolt hole, 4c... Oil supply hole with dish-shaped portion, 4d...・
...Lubrication hole with a diameter smaller than the thrust bearing plate thickness,
4e...The inside of the hole that undergoes plastic forming to be deformed, 4f...The part where the meat moves due to plastic forming,
5...Lower bearing, 7...Step punch for obtaining a hole diameter smaller than the plate thickness by stepping, 7a...Step punch 7 Large diameter part, 7b...
...Small diameter part of stepped punch 7.

Claims (1)

[Claims] 1. In the method of manufacturing the thrust bearing 4, which receives heavy loads from some parts of the compressor main body, and which also receives rotational sliding at each end of the rotating shaft, lubricating oil supplied to the compressor main body passes through the thrust bearing 4. After punching the oil supply hole 4d with a diameter larger than the plate thickness, a stepped punch 7 having a small diameter part 7b having an outer diameter smaller than the plate thickness of the thrust bearing 4 and an outer diameter part 7a larger than the oil supply hole 4d, The diameter of the thrust bearing 4 is made smaller than the plate thickness of the thrust bearing 4 by press-molding it into the oil supply hole 4d and moving the excess thickness of the thrust bearing 40 crushed by the large diameter part 7a to the periphery of the small diameter part 7b by movement of the network structure. A method of manufacturing a thrust bearing for a compressor, characterized in that the oil supply hole 4d is formed as follows.