JPH04103886A - Piston device of compressor - Google Patents

Abstract

PURPOSE:To reduce the reciprocating mass, to decrease the noise in the sliding, and to improve the assembly work efficiency, by holding spheres with a circular groove provided to a shaft, and a circular groove provided to a keep plate made of a reinforced synthetic resin which is fixed to the upper side of the shaft. CONSTITUTION:In a crankshaft 14, a shaft 13 furnishing an oil hole 11 in the axial direction and a circular groove 12 on which spheres 9 slide, and a keep plate 17 made of a reinforced synthetic resin furnishing a circular groove 16 fixed to the upper side of the shaft 13 and spheres 9 slide on are provided. While spheres 9 are held between the circular grooves 12 and 16, the center axis L of both circular grooves is formed deflecting from the axial center M of the shaft 13. As a result, by making the shaft 13 and the like also of the reinforced synthetic resin, the major parts of the crank 10 can be formed of the reinforced synthetic resin, and the reciprocating mass can be reduced. And since a shaking between the spheres 9 can be suppressed by the elasticity of the keep plate 17 itself, a noise in the sliding can be reduced. Furthermore, since the number of parts can be reduced, the assembly work efficiency can be improved.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a 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 connected to the crankshaft by a ball joint. The present invention relates to a piston device.

(b) Conventional technology Conventionally, the piston device of this type of compressor was
As described in Japanese Patent No. 40064, a sphere is provided at the end of the connecting rod that connects the crankshaft and the piston, and the front surface of this sphere is brought into contact with a spherical seat provided on the inner surface of the piston. The piston and the sphere are connected by caulking the rear surface with a caulking part provided on the piston, and
A synthetic resin packing is interposed between the rear surface of the sphere and the caulking portion.

(C) Problems to be Solved by the Invention However, according to the above configuration, the connection between the connecting rod and the crankshaft is performed through a cylindrical body that is integrated with the connecting rod, and the cylindrical body and the crankshaft are usually Since the compressor is made of steel, it is heavy and has a large reciprocating mass, which not only makes it difficult to improve the performance of the compressor as desired, but also because it is a metal-to-metal sliding contact, if the amount of oil supplied is insufficient, the sliding clearance may become loose. This poses a problem in that it generates noise and tends to cause abnormal wear. Furthermore, since the caulking joint requires a separate gasket, the number of parts is large and the assembly work is troublesome.

The present invention has been made in view of these points, and aims to reduce the reciprocating mass of the piston device and improve the performance of the compressor.
The purpose is to provide a practical compressor piston device that eliminates sliding contact between metals, reduces noise during sliding, and also improves assembly workability and makes it easier to accommodate multiple cylinders. shall be.

(2) Means for Solving the Problems The present invention provides a spherical body at one end of a connecting rod that connects a crankshaft and a piston, and this spherical body is connected to the crankshaft by a ball joint. The shaft is made of reinforced synthetic resin and has an oil hole in the axial direction and an annular groove on the upper surface of which the sphere slides, and an annular groove that is fixed to the upper surface of the shaft and in which the sphere slides. a pressing plate, the spherical body is held in the open annular groove,
The center axis of the open annular groove is formed eccentrically from the axis of the shaft portion.

Further, an oil passage is formed in the crankshaft to communicate the oil hole and the annular groove.

The shaft is also made of reinforced synthetic resin.

Furthermore, the spheres are also made of reinforced synthetic resin.

Further, a sphere is provided at one end of a plurality of connecting rods that connect the crankshaft and a plurality of pistons, and the plurality of spheres are connected to the crankshaft by a ball joint, and the crankshaft is arranged in an axial direction. A shaft part having an oil hole and an annular groove on the upper surface of which the sphere slides, and a presser plate made of reinforced synthetic resin that is fixed to the upper surface of the shaft part and has an annular groove in which the sphere slides. , the plurality of spheres are sandwiched between the apex grooves, and the center axis of the open annular groove is eccentric from the axis of the shaft portion.

(E) Function The compressor piston device of the present invention has the above-described configuration, and since most parts including the crank part can be made of synthetic resin, the mass associated with the reciprocating movement of the device can be reduced compared to the conventional one. Compressor performance can be improved. In addition, since the holding plate is highly self-lubricating, it can reduce the sliding resistance on the sliding surface and reduce the human power required for the compressor.Furthermore, the elasticity of the holding plate itself suppresses play between it and the sphere. This makes it possible to eliminate the need for intervening parts such as packing, reduce the number of parts, improve assembly workability, and suppress the generation of sliding noise even when the amount of oil supply is insufficient. Furthermore, it can easily accommodate multiple cylinders.

Further, if the shaft portion and the sphere are also made of synthetic resin, it is possible to further reduce the reciprocating mass and simplify the manufacturing process.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

1 is a sealed case 2 in which lubricating oil is stored at the bottom, a compressor part 3 is housed in the upper part, and an electric motor part 4 is housed in the lower part, and both parts 3 and 4 are connected by a crankshaft 14. It is a compressor. Reference numeral 6 denotes a piston device constituting the compressor section 3, and this device includes a piston 7, a connecting rod 8 connected to this piston, a sphere 9 fixed to one end of this connecting rod, and this sphere 9. It is composed of a crank part 10 that is pivotally supported by a ball joint connection. That is, the crankshaft 14 includes a shaft portion 13 having an oil hole 11 in the axial direction and an annular groove 12 on the upper surface of which the sphere 9 slides, and a port 15 fixed to the upper surface of the shaft portion. A holding plate 17 made of reinforced synthetic resin having an annular groove 16 facing the annular groove 12 is provided so that the sphere 9 can slide thereon, and the sphere 9 is held between the circumferential annular groove 12 and 16, and the circumferential groove 12 is The center axis of the annular groove 12.16 is configured to be eccentric from the axis M of the shaft portion 13. Further, a balancer 18 is integrally fixed to the upper surface of the holding plate 17 with bolts 15. Further, the shaft portion 13, the holding plate 17, and the balancer 18 are formed with two oil injection holes 19 that communicate with the oil hole 11 and extend upward in the axial direction. An oil port 20 that opens into the annular groove 12 is formed in the middle of the jet hole 19 . Here, the pressing plate 17 is formed by injection molding of a reinforced synthetic resin (hereinafter referred to as engineering plastic) that has strong refrigerant resistance, oil resistance, and heat resistance. 5kg/mm2 or more,
It is a synthetic resin with a long-term heat resistance temperature of 100°C or higher, but in the present invention, it has a coefficient of linear expansion that is similar to that of cast iron (1.1X
It is preferable to use a thermosetting engineering plastic having excellent refrigerant resistance, oil resistance, and heat resistance, for example, reinforced epoxy resin.

Note that the reinforced resin is a resin containing fillers such as glass fibers and carbon fibers.

Further, the lubricating oil stored at the bottom of the sealed case 2 is pumped up through the oil hole 11 by the centrifugal pump action of the crankshaft 14, and then is scattered in the rotational direction from the oil spout hole 19 of the crank part 10. . Here, in the rotational position where the sphere 9 is not present at the opening of the oil outlet 20 on the sphere 9 side, a part of the lubricating oil rising through the oil spout hole 19 flows from the oil hole 20 into the annular groove 12.16 and flows into the sphere 9. Lubricate the sliding surfaces of

In the compressor piston device configured in this way,
Since the holding plate 17 is made of engineering plastic, the mass of the crank portion 10 can be reduced compared to the conventional one, and the performance of the compressor can be improved by reducing the reciprocating mass. Further, since the holding plate 17 is highly self-lubricating, it is possible to reduce the sliding resistance of the sliding surface between it and the sphere 9, thereby reducing the input to the compressor. Furthermore, due to the elasticity of the pressing plate 17 itself, there is no need to interpose a gasket between it and the sphere 9.
Since the occurrence of backlash can be suppressed, packing can be eliminated and the number of parts can be reduced. Further, an annular groove 12 serving as a sliding surface.
Oil can be well supplied into the oil outlet 16 through the oil jet hole 19 and the oil port 20, and the oil supply characteristics can be improved. Also, the fourth
Another piston 22. as shown. connecting rod 239
When assembling a multi-cylinder piston by adding a sphere 21, it can be assembled in the same way by simply setting the other sphere 21 in the annular groove 12.16, which simplifies the assembly of the multi-cylinder piston. can.

According to this embodiment, only the holding plate 17 is made of engineering plastic, but the shaft portion 13, the connecting rods 8, 23, . If the spheres 9, 21, etc. are also made of engineering plastic, the weight of the piston device can be further reduced, and the performance can be improved by reducing the reciprocating mass and the sliding resistance between the spheres 9, 21 and the crank part IO. The production of the device can also be simplified.

(G) Effects of the Invention As described above, according to the present invention, most of the crank part can be made of synthetic resin, so the mass associated with the reciprocating movement of the device can be reduced compared to the conventional one, and the compressor performance can be improved. In addition, since the holding plate is highly self-lubricating, it can reduce the sliding resistance on the sliding surface and reduce the compressor input, and the elasticity of the holding plate itself suppresses play between it and the sphere. This makes it possible to eliminate the need for intervening parts such as packing, reduce the number of parts, improve assembly workability, and suppress the generation of sliding noise even when the amount of oil supply is insufficient. Furthermore, it can easily accommodate multiple cylinders.

Further, if the shaft portion and the sphere are also made of synthetic resin, it is possible to further reduce the reciprocating mass and simplify the manufacturing process.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a hermetic compressor showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of a piston device, Fig. 3 is a plan sectional view of the piston device, and Fig. 4 is another embodiment. FIG. 2 is a plan cross-sectional view of a multi-cylinder piston device. 6...Piston device, 7.22-...Piston, 8゜2
3 connecting rods, 9.21・sphere, 10・-crank part 12.
16.-Annular groove, 17. Pressing plate.

Claims (5)

[Claims] (1) A sphere is provided at one end of the connecting rod that connects the crankshaft and the piston, and this sphere is connected to the crankshaft with a ball joint, and the crankshaft has an oil hole in the axial direction. a shaft portion having an annular groove on the upper surface in which the sphere slides; and a presser plate made of reinforced synthetic resin that is fixed to the upper surface of the shaft portion and has an annular groove in which the sphere slides; A piston device for a compressor, characterized in that the piston device is sandwiched between annular grooves, and the center axes of both the annular grooves are formed eccentrically from the axis of the shaft portion. (2) The piston device for a compressor according to claim 1, wherein the crankshaft is formed with an oil passage that communicates the oil hole with the annular groove. (3) The piston device for a compressor according to claim 1, wherein the shaft portion is made of reinforced synthetic resin. (4) The piston device for a compressor according to claim 1, wherein the sphere is made of reinforced synthetic resin. (5) A sphere is provided at one end of a plurality of connecting rods that connect a crankshaft and a plurality of pistons, and the plurality of spheres are connected to the crankshaft with a ball joint, and the crankshaft is axially A shaft part having an oil hole and an annular groove on the upper surface of which the sphere slides, and a presser plate made of reinforced synthetic resin that is fixed to the upper surface of the shaft part and has an annular groove in which the sphere slides. A piston device for a compressor, wherein the plurality of spheres are held between the annular grooves, and the center axes of the annular grooves are eccentric from the axis of the shaft portion.