JPH0331584A - Closed motor compressor - Google Patents

Abstract

PURPOSE: To facilitate the manufacture of a compressor by disposing each pair of balls and rollers between a bush cooperating with a vertical shaft fixed to the rotor of a motor, and continuously-mounted with pistons in a cylinder through a connecting rod, and the vertical shaft. CONSTITUTION: This hermetic compressor stores and electric motor 12 disposed at the upper part of shell 11, and a compressor block 13 disposed at its lower part, and this block 13 is springlily lifted by a spring 14 in the shell 11. A piston 17 is included in the cylinder 15 of the block 13, and the piston 17 is reciprocated by the rotation of a vertical shaft 19 fixed to the rotor 20 of the motor 12 through a connecting rod 18. The vertical shaft 19 is supported by a bush 21 fixed to the block 13, and a pair of ball 25 and roller 26 are held on the respective seats in the bush 21 so as to attain the connection with the vertical shaft 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic motor compressor for a refrigerator that includes a reciprocating and vertically extending shaft.

In a reciprocating compressor with a vertical shaft, a washer forming a shoulder between the vertical shaft and the bearing is used to reduce the friction between the shaft and the bushing, as well as for quick assembly of the shaft. Replacement arrangements with ball bearings or roller bearings are known. When using ball or roller bearings, friction is certainly reduced, but the problem is that the balls and rollers have to be housed in a housing that has an outer diameter that is considerably larger than the inner diameter that corresponds to the diameter of the shaft. Another problem arises in that the bushing in which the bearing is housed must be considerably larger than other practical bushings. This means an increase in material and thus an increase in the size, weight and manufacturing costs of the compressor, as well as a reduction in the effective volume of the refrigerator when positioning the compressor within the refrigerator cabinet. . This means that when developing compressors of new configurations, external disturbances to the cabinet can be permanently avoided, the effective volume of the refrigerator can be increased, and compressors that have already been achieved in conventional compressors The trade-off between the shape of the compressor and the noise of the compressor becomes more satisfactory.

Another disadvantage of using a bearing with the above-described construction is the increased manufacturing cost of the compressor.

This is due to the increased mechanical work involved in pressurizing the bearing to the shaft and bushing, and the fact that the work must be done carefully when assembling the bushing bearing and the shaft bearing. There is.

It is therefore an object of the invention to avoid the above-mentioned drawbacks.

The technical problem to be solved is to increase the size of the compressor, increase the manufacturing cost of the compressor, and increase the cost of mounting the bearings on the seat, while keeping the shaft and bushings connected by balls and/or rollers. The aim is to realize the assembly between the two.

In order to solve the above-mentioned technical problems, the compressor of the present invention disposes one set of balls or one set of rollers between the bush and the shaft, and accommodates the one set of balls or rollers. The bushing is characterized in that means for this purpose is provided within the bushing.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. As shown in FIG. 1, a hermetic motor compressor of the type with a vertically extending shaft has a shell U, which shell 11 has an electric motor 12 arranged in its upper part;
The compressor block 13 is arranged in the lower part and fixed to the electric motor. The block 13 is resiliently lifted within the shell 11 by a spring 14. Cylinder 1 closed by head 16
5 is formed by a block 13. cylinder 1
5, a piston 17 performs a reciprocating movement via a connecting rod 18 driven by a vertical shaft 19, said vertical shaft 19 being connected to a rotor 20 of a motor 12.
and is supported by a bushing 21 fixed to block I3. Said bush 21
(see FIG. 3) has an inner hole 22 for the shaft 19, and the inside of the bushing 21 accommodates a set of balls 25 and a set of rollers 26, respectively, in order to achieve connection with the shaft 19. Seats 23, 24 are provided for this purpose (see FIG. 2). Washers 27 hold the set of balls 25 in place, and washers 28,29 are located at the ends of the set of rollers 26.

The small diameter pipe 33 fixed to the crank 32 of the shaft is
The lubricating oil stored at the bottom of the shell U is conveyed through a duct 34 and a hole 35 to a set of balls 25 and a set of rollers 26 disposed on the bush 21.

In order to achieve a compactness of the coupling system between the shaft 19 and the bushing 21, the balls 25 and the rollers 26 are not provided with a conventional housing and their seats are connected to the bushing 21.
It is formed directly inside the hole 22 of. This makes it possible to reduce the amount of materials used and to reduce the weight.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the hermetic motor compressor of the present invention, Fig. 2 is a sectional view showing the assembled state of the bush and shaft shown in Fig. 1, and Fig. 3 is the sectional view shown in Fig. 2. FIG. ■...Shell 12...Electric motor 3.
...Block 14...Spring 5...Cylinder 16...Head 7...Piston
18...Conrod 9...Shaft
20... Rotor 21... Bush 23.
24... Seat 25... Pole 26...
・Rollers 27, 28, 29...Engraving of the washer drawing (changes may be made to the contents) Figure 1 Figure 2 Original manuscript, method) % formula % 1. Indication of the incident Heisei 6753 2. Name of the invention Sealed motor Compressor 3: Relationship with the person making the amendment case

Claims (1)

[Claims] 1. A hermetic motor compressor for a refrigerator including a shaft that reciprocates and extends in a vertical direction, the compressor having a block disposed in an upper part and placed in a lower part. A hermetic motor compressor comprising a fixed electric motor and a bushing cooperating with the shaft fixed to the block and driven by the motor, a set of balls between the bushing and the shaft; Or a hermetic motor compressor, characterized in that a set of rollers is arranged and means for accommodating the set of balls or rollers is provided within the bush. 2. A motor compressor according to claim 1, wherein said means comprises a seat formed within said bushing for accommodating said set of balls or rollers. 3. A hermetic motor compressor for a refrigerator comprising a reciprocating and vertically extending shaft, the electric motor being disposed in the upper part and fixed to a block placed in the lower part; , a hermetic motor compressor comprising a bushing cooperating with the shaft fixed to the block and driven by the motor, with a set of balls and a set of rollers between the bush and the shaft; A hermetic motor compressor, characterized in that means are provided within said bushing for arranging and accommodating said set of balls and rollers. 4. A motor compressor according to claim 3, wherein said means comprises two seats formed within said bushing for accommodating said set of balls and rollers. Machine. 5. The motor compressor according to any one of claims 1 to 4, wherein the set of balls is held in a predetermined position by a washer. 6. The motor compressor according to any one of claims 1 to 4, wherein the set of rollers is held in a predetermined position by two washers.