JPH0236794B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a ball joint method for a hermetic compressor that connects a ball provided on a connecting rod and a ball seat provided on a piston.

[Technical background of the invention and its problems]

As shown in FIG. 1, a hermetic compressor used in a refrigeration cycle has an electric motor section 2 inside a hermetic case 1.
and a compressor section 3 are housed therein. This compressor section 3
A crankshaft 6 that is fixed to the upper end of a shaft 5 that is pivotally supported on a frame 4 and rotates eccentrically, a piston 8 that reciprocates within a cylinder 7, and a connecting rod 9 that connects the piston 8 and the crankshaft 6. It consists of The connecting rod 9 and the piston 8 are connected by a ball joint 10, as shown in FIG. That is, a spherical body 11 is provided at one end of the connecting rod 9, and a spherical seat 12 is provided on the piston 8 to fit the spherical body 11. After the spherical body 11 is fitted into the spherical seat 12, the spherical seat 12 is They are connected by caulking so that they can swing freely.

Therefore, since the spherical body 11 and the spherical seat 12 slide during operation of the hermetic compressor, it is necessary to supply lubricating oil between the spherical body 11 and the spherical seat 12. By the way, a conventional lubricating oil supply passage is constructed as shown in FIGS. 3 and 4. That is, FIG. 3 shows a case where a small hole 13 is drilled in the side surface of the ball seat 12, and FIG. be.

However, although the former type is easy to process, it has the disadvantage that lubricating oil is difficult to enter, and the latter type allows lubricating oil to enter between the sphere 11 and the ball seat 12 efficiently. , which is difficult to process and increases costs.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and its purpose is to shorten the manufacturing process by simultaneously forming a lubricating oil supply passage when caulking the spherical seat that fits into the spherical body of the connecting rod. It is an object of the present invention to provide a ball joint method for a hermetic compressor, which allows for a ball joint of a hermetic compressor, and also enables a good supply of lubricating oil.

[Summary of the invention]

In this invention, when the sphere of the connecting rod is fitted into the sphere of the piston, wrinkles are formed in a part of the sphere when the sphere is caulked with a caulking tool, and the wrinkles cause the lubricating oil to The purpose is to form a supply passage.

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in the drawings. In FIG. 5, reference numeral 21 indicates a compressor section of the hermetic compressor, and reference numeral 22 indicates a crankshaft that rotates eccentrically. A piston 23 reciprocates within the cylinder 24, and the piston 23 and the crankshaft 22 are connected by a connecting rod 25. The piston 23 has a cylindrical shape with a bottom, and a spherical seat 27 is integrally provided at the bottom 26 of the piston 23 by a method described later.
A ball 28 provided at one end of the ball 28 is attached to the ball joint 29 so as to be able to swing freely.

6 and 7 show a part of the caulking tool 30, the distal end surface of which is provided with a molding surface 31 consisting of a dish-shaped recess, and this molding surface 31 has symmetrical relief grooves 32, 32 are provided.

Therefore, the ball seat 27 of the piston 23 and the connecting rod 2
When ball jointing the ball 28 with the ball 28 of No. 5, the ball 28 is first fitted into the ball seat 27. In this state, the caulking tool 30 is inserted into the piston 23 as shown in FIG. 8, and the molding surface 31 at the tip thereof is brought into contact with the spherical seat 27. Therefore, when a pressing force is applied to the caulking tool 30 in the direction of arrow A, the ball seat 27 is caulked inward by the molding surface 31 to form a caulking portion 33 that tightly contacts the sphere 28 . At this time, the ball seat 27 facing the relief grooves 32, 32 of the caulking tool 30 bulges into the relief grooves 32, 32 due to the pressing force of the caulking tool 30, as shown in FIGS. 9 and 10.
As shown, wrinkles 34, 34 are formed.
By these wrinkles 34, 34, the spherical seat 27 and the spherical body 28
A gap is formed between the lubricating oil supply passages 35, 35 by this gap. Therefore, the spherical seat 27 of the piston 23 and the spherical body 28 of the connecting rod 25 are swingably connected by the caulking part 33, and lubricating oil supply passages 35, 35 are formed in a part thereof. Therefore, during the operation of the compressor section 21, the lubricating oil a is supplied from the oil hole 21a of the crankshaft 22 to the lubricating oil supply passages 35, 35,
Wear between the spherical seat 27 and the spherical body 28 can be prevented.

In addition, in the above embodiment, the ball seat 27 has two
Although the lubricating oil supply passage 35 was formed in several locations, the 11th
As shown in Figure A, it may be in one place, or in Figure B.
The lubricating oil supply passages 35 may be formed at a plurality of locations as shown in FIG.

〔Effect of the invention〕

As explained above, this invention uses a special crimping system that has a relief groove and a connecting rod insertion hole in a part of the crimping surface when the spherical body is fitted into the spherical seat of the piston and then this spherical seat is crimped. Using a tool, a part of the spherical seat was bulged out to form a lubricating oil supply passage with one end opening at the periphery of the spherical seat, so multiple lubricating oil supply passages could be formed in one go. , it is possible to improve machining efficiency and machining accuracy, and the manufacturing process can be significantly shortened and manufacturing costs can be reduced. Moreover, since the lubricating oil supply passage is formed along the surface of the sphere, the lubricating oil is easily drawn in, and the durability can be improved.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a hermetic compressor, Figs. 2 to 4 are sectional views showing a conventional ball joint, and Fig. 5 is a longitudinal sectional front view of a compressor section showing an embodiment of the present invention. , FIG. 6 is a perspective view of the caulking tool, FIG. 7 is a sectional view taken along the line of FIG. 6, and FIG.
The figure is a vertical sectional front view showing the crimped state, and FIG. 9 is a plan view showing the connected state of the spherical seat and the sphere.
Figure 10 is a sectional view taken along the line of Figure 9;
Figures A and B are plan views showing other embodiments. 22...Crankshaft, 23...Piston, 25
...Connecting rod, 27...Spherical seat, 28...Sphere, 34
...Wrinkle, 35...Lubricating oil supply passage.

Claims (1)

[Claims] 1. In a ball joint method for a hermetic compressor in which a sphere is provided at one end of a connecting rod that connects a crankshaft and a piston, and this sphere is slidably connected to a ball seat provided on the piston, the ball of the piston is It consists of a fitting process of fitting the sphere into the seat, and a caulking process of caulking the sphere to which the sphere is fitted to connect the sphere to the sphere. The caulking is performed using a caulking tool having at least one relief groove in the part and an insertion hole for the connecting rod, and a part of the spherical seat is bulged in the relief groove and deformed to follow the relief groove, so that one end part is A ball joint method for a hermetic compressor, characterized by forming at least one lubricating oil supply passage opening at the peripheral edge of a ball seat.