JPH04284187A - Sealed type compressor - Google Patents

Abstract

PURPOSE:To obtain a compressor having the less number of parts and assembly manhour and the less input and the superior energy efficiency by removing an inner race which is used for ball bearing in the conventional and using a crankshaft having and an inner race trajectory formed on a part of the shaft, in substitution. CONSTITUTION:A ball bearing 26 is constituted of an outer race 29 which is formed by press-fitting an outer peripherg in a bearing part 27, trajectory of the outer race 29, balls 28 which roll between an inner race trajectory 25a formed at a part of a crankshaft, and a retainer 30 for holding the balls, 28, and axially supports the crankshaft 25.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in refrigerators and the like.

0002

BACKGROUND OF THE INVENTION In recent years, hermetic compressors (hereinafter referred to as compressors) are required to have higher compression efficiency from the viewpoint of improving energy efficiency. Compressors have become highly efficient and have reached a high level, but we must continue to improve efficiency even further.

An example of a conventional compressor will be described below with reference to the drawings. Figure 2 is JP-A No. 63-13487.
FIG. 2 is a sectional view of the compressor shown in Publication No. 2. A compressor element 2 and an electric element 3 are elastically supported in a closed container 1, and a crankshaft is press-fitted into a rotor 4 of the electric element 3.

Further, the crankshaft 5 is supported by a ball bearing 7 and a ball bearing 8 which are disposed closer to the electric element 3 than the eccentric portion 6 of the crankshaft 5, and It has a bearing 9 that pivotally supports the crankshaft 5, and a spring 11 made of a plate spring having a wave shape between the outer frame portion 10 of the ball bearing 8 below the gravity direction and the bearing 9 in the thrust direction. There is.

The ball bearings 7 and 8 are fixed to the crankshaft 5 so that the spring 11 is compressed, and a sleeve 12 is fixed to the crankshaft 5 to prevent them from coming off. 13 is a connecting rod 14 is a piston. 15 is refrigerating machine oil sealed in a sealed container.

Regarding the compressor configured as above,
The operation will be explained below. First, the rotor 4 of the electric element 3 rotates, and the crankshaft 5 fixed to the rotor 4 rotates, causing the piston 14 to reciprocate via the connecting rod 13 and compressing the gas.

[0007] Ball bearing 7, ball bearing 8
By using , sliding loss is reduced and high efficiency is achieved. In addition, by inserting the spring 11 between the outer frame 10 of the ball bearing 8 in the lower direction of gravity and the thrust direction of the bearing 9, the ball bearing is subjected to the thrust load due to the spring 11 + the self-reflection of the crankshaft 5 and rotor 4. Gravity acts;
A thrust load from a spring 11 acts on the ball bearing 8 .

Furthermore, the thrust load can be applied while suppressing the influence of the weight of the crankshaft 5 and rotor 4, and the sliding noise of the ball bearings 7 and 8 can be suppressed.

[0009]

[Problems to be Solved by the Invention] However, with the above configuration, the ball bearing 8 requires both an outer ring and an inner ring, and the inner ring must be press-fitted onto the crankshaft, which requires a large number of parts and is difficult to assemble. This method had the problem of requiring a lot of work.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a compressor that has fewer parts, does not require press-fitting, and requires less man-hours.

[0011]

[Means for Solving the Problems] In order to solve the above problems, the compressor of the present invention includes a compression element and an electric element that are elastically supported in a closed container, and a rotor of the electric element that is fixed to the rotor of the electric element. It consists of a crankshaft, a ball bearing that pivotally supports the crankshaft, and a bearing part that pivotally supports the crankshaft via the ball bearing, and the ball bearing is connected to the ball, the outer ring, the retainer, and a part of the shaft. It consists of a crankshaft with an inner raceway.

0012

[Operation] According to the present invention, the inner ring raceway provided on a part of the crankshaft serves as the inner ring due to the above-described structure.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A compressor according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21 denotes a closed container, inside which a compression element 22 and an electric element 23 are provided.
is stored elastically. 24 is a rotor of the electric element 23, and a crankshaft 25 is press-fitted into the inner diameter of the rotor.

26 is a ball bearing, and the bearing part 2
7, an outer ring 29 whose outer periphery is press-fitted, a ball 28 that rolls between the raceway of the outer ring 29 and an inner raceway 25a provided on a part of the crankshaft, and a retainer 30 that holds the ball 28. The crankshaft 25 is pivotally supported.

In the above configuration, when the electric element is energized, the crankshaft integrated with the rotor rotates, and the gas is compressed by the compression element. When the compressor is operating, it rotates lightly due to the action of ball bearings, making it energy efficient.

Therefore, by eliminating the inner ring conventionally used in ball bearings and instead using a crankshaft with an inner raceway provided on a part of the shaft, a compressor with fewer parts and less man-hours for assembly can be created. be able to.

[0017]

As described above, the present invention comprises a compression element and an electric element elastically supported in a closed container, a crankshaft fixed to the rotor of the electric element, and a ball that pivotally supports the crankshaft. The crankshaft is made up of a bearing and a bearing part that pivotally supports the crankshaft via the ball bearing, and the ball bearing is made up of a crankshaft having a ball, an outer ring, a retainer, and an inner raceway on a part of the shaft. By eliminating the inner ring conventionally used in ball bearings and replacing it with a crankshaft that has an inner ring raceway on a part of the shaft, the compressor has fewer parts and fewer man-hours for assembly. In addition, the compressor has low input power due to the action of ball bearings and has good energy efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a compressor in one embodiment of the present invention.

[Figure 2] Cross-sectional view of a conventional compressor

[Explanation of symbols]

21　Airtight container 22 Compression element 23 Electric element 24 Rotor 25 Crankshaft 26 Ball bearing 27 Bearing part 28 Ball 29 Outer ring 30 Cage 25a Inner raceway

Claims (1)

[Claims] 1. A compression element and an electric element elastically supported in a closed container, a crankshaft fixed to the rotor of the electric element, a ball bearing that pivotally supports the crankshaft, and and a bearing portion for pivotally supporting the crankshaft, and the ball bearing is comprised of a ball, an outer ring, a retainer, and a crankshaft having an inner raceway provided on a part of the shaft. Hermetic compressor.